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diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..ea8c4bf --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +/target diff --git a/.vscode/launch.json b/.vscode/launch.json new file mode 100644 index 0000000..12722ca --- /dev/null +++ b/.vscode/launch.json @@ -0,0 +1,16 @@ +{ + // Use IntelliSense to learn about possible attributes. + // Hover to view descriptions of existing attributes. + // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387 + "version": "0.2.0", + "configurations": [ + { + "name": "(OSX) Launch", + "type": "lldb", + "request": "launch", + "program": "${workspaceRoot}/target/debug/rust-expr", + "args": [], + "cwd": "${workspaceRoot}" + } + ] +} diff --git a/CLAUDE.md b/CLAUDE.md new file mode 100644 index 0000000..e6f4f05 --- /dev/null +++ b/CLAUDE.md @@ -0,0 +1,90 @@ +# CLAUDE.md + +This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository. + +## Project Overview + +dexpr is an embeddable expression evaluator and bytecode VM written in Rust. It parses expressions and simple scripts (`.dexpr` files), compiles to bytecode, and executes on a register-based virtual machine. Designed to be embedded in other projects as a rule engine, formula evaluator, or expression calculator. + +## Common Commands + +```bash +# Run tests +cargo test + +# Run benchmarks +cargo bench --bench my_benchmark + +# Run the main program (executes basic_long.dexpr by default) +cargo run --release + +# Profile with samply +cargo build --profile profiling +samply record ./target/profiling/dexpr +``` + +## Architecture + +The pipeline flows: **Parser → AST → Compiler → Bytecode → VM** + +### Core Modules + +- **`parser/`**: PEG-based parser (`grammar.rs`) that produces AST nodes +- **`ast/`**: Expression (`expr.rs`), statement (`stmt.rs`), and value (`value.rs`) types +- **`compiler.rs`**: Transforms AST into bytecode; single-pass, globals-only, register allocation +- **`bytecode.rs`**: `BytecodeWriter` for compilation, `BytecodeReader` for VM consumption +- **`opcodes.rs`**: Defines `OpCodeByte` enum and `Register` type +- **`vm/vm.rs`**: Register-based VM with global variable support; executes bytecode + +### Key Types + +- `Value` (ast/value.rs): Runtime values (Number using rust_decimal, String, Boolean, Object using indexmap, etc.) +- `Compiler`: Stateful compiler with register allocation +- `VM<'a>`: Bytecode interpreter with global variable support via `set_global`/`get_global` + +### Typical Usage Pattern + +```rust +use dexpr::{ast::value::Value, compiler::Compiler, parser, vm::VM}; + +let ast = parser::program(source_code)?; +let mut compiler = Compiler::new(); +let bytecode = compiler.compile(ast)?; +let mut vm = VM::new(&bytecode); +vm.set_global("input", Value::Number(dec!(42))); +vm.register_function("getRate", |args| Ok(Value::Number(dec!(34.5)))); +let result = vm.execute()?; // Returns last expression's value +// Or use globals: let output = vm.get_global("output"); +``` + +## Language Features + +The dexpr language supports: +- If/else conditionals with `if ... then ... else ... end` +- String methods (e.g., `.upper()`, `.lower()`, `.trim()`, `.trimStart()`, `.trimEnd()`, `.split()`, `.replace()`, `.contains()`, `.startsWith()`, `.endsWith()`, `.length`, `.charAt()`, `.substring()`) +- Arithmetic (`+`, `-`, `*`, `/`, `%`, `**`), comparison, and logical operators +- `in` operator for membership testing (`"finans" in categories`, `5 in numbers`, `"hello" in "hello world"`, `"key" in obj`) +- Compound assignments (`+=`, `-=`, `*=`, `/=`, `%=`) +- Built-in `log()` function for output and `rand(min, max)` for random integers +- External (host) function registration via `vm.register_function()` +- External (host) method registration via `vm.register_method()` +- Expression return value: `execute()` returns the last expression's value +- Line comments (`//`) and block comments (`/* */`) +- Lists: `NumberList` and `StringList` types with methods (`sum`, `avg`, `min`, `max`, `first`, `last`, `get`, `join`, `contains`, `indexOf`, `slice`, `reverse`, `sort`, `isEmpty`, etc.) +- Objects: `Object` type (provided externally via `set_global`) with property access (`obj.field`), nested access (`obj.a.b`), property assignment (`obj.field = value`), and methods (`keys()`, `values()`, `length()`, `contains(key)`, `get(key)`) + +## Detailed Module Documentation + +**IMPORTANT:** Before making any changes to the codebase, read the relevant documentation files in the `docs/` folder to understand how that module works in detail. After making changes to any module, update the corresponding documentation file to keep it in sync. + +- **[docs/architecture.md](docs/architecture.md)** — Overall architecture, pipeline, design decisions, dependencies +- **[docs/ast.md](docs/ast.md)** — AST module: Expr, Stmt, Value types, Span, serialization format +- **[docs/parser.md](docs/parser.md)** — Parser: PEG grammar rules, operator precedence, reserved keywords +- **[docs/opcodes.md](docs/opcodes.md)** — Opcodes: full instruction set with hex values and categories +- **[docs/bytecode.md](docs/bytecode.md)** — Bytecode: BytecodeWriter/Reader API, data format, disassembler +- **[docs/compiler.md](docs/compiler.md)** — Compiler: single-pass compilation, register allocation, label/jump system +- **[docs/vm.md](docs/vm.md)** — VM: execution loop, opcode handlers, error types, DebugInfo +- **[docs/language_info.md](docs/language_info.md)** — Language Info: editor metadata generation, JSON format, host integration +- **[docs/editor.md](docs/editor.md)** — Editor: CodeMirror 6 language support, Lezer grammar, type-aware autocomplete + +**Rule:** Any code change that modifies the behavior, API, or structure of a module MUST be accompanied by an update to the corresponding `docs/` file. 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+rust_decimal_macros = "1.40.0" +rand = "0.10.0" +smallvec = "1.15.1" +rustc-hash = "2.1.2" +peg = "0.8.5" +smol_str = "0.3.6" +micromap = "0.3.0" +thiserror = "2.0.18" +bumpalo = "3.20.2" +indexmap = "2" +serde_json = "1" + +[dev-dependencies] +criterion = { version = "0.8.2", features = ["html_reports"] } + +[[bench]] +name = "my_benchmark" +harness = false diff --git a/benches/my_benchmark.rs b/benches/my_benchmark.rs new file mode 100644 index 0000000..26d6cc1 --- /dev/null +++ b/benches/my_benchmark.rs @@ -0,0 +1,69 @@ +use criterion::{criterion_group, criterion_main, Criterion}; +use dexpr::{ast::value::Value, compiler::Compiler, parser, vm::VM}; +use rust_decimal_macros::dec; + + + +pub fn criterion_benchmark(c: &mut Criterion) { + // 1. Parser Benchmark + c.bench_function("parser_long", |b| { + let input = include_str!("../src/bench_long.dexpr"); + b.iter(|| { + let _ = parser::program(input).unwrap(); + }) + }); + + // 2. Compiler Benchmark + c.bench_function("compiler_long", |b| { + let input = include_str!("../src/bench_long.dexpr"); + let ast = parser::program(input).unwrap(); + b.iter(|| { + let mut compiler = Compiler::new(); + let _ = compiler.compile(ast.clone()).unwrap(); + }) + }); + + // 3. VM Benchmarks + + // basic_long.dexpr benchmark + c.bench_function("vm_basic_long", |b| { + let input = include_str!("../src/basic_long.dexpr"); + let ast = parser::program(input).unwrap(); + let mut compiler = Compiler::new(); + let bytecode = compiler.compile(ast).unwrap(); + b.iter(|| { + let mut vm = VM::new(&bytecode); + vm.set_global("test", Value::Number(dec!(3))); + let _ = vm.execute().unwrap(); + }) + }); + + // Long code benchmark (using bench_long.dexpr) + c.bench_function("vm_long", |b| { + let input = include_str!("../src/bench_long.dexpr"); + let ast = parser::program(input).unwrap(); + let mut compiler = Compiler::new(); + let bytecode = compiler.compile(ast).unwrap(); + b.iter(|| { + let mut vm = VM::new(&bytecode); + let _ = vm.execute().unwrap(); + }) + }); + + // Short code benchmark + c.bench_function("vm_short", |b| { + let input = "5.12 + test * 1.5"; + let ast = parser::program(input).unwrap(); + let mut compiler = Compiler::new(); + let bytecode = compiler.compile(ast).unwrap(); + let test_val = dec!(100); + b.iter(|| { + let mut vm = VM::new(&bytecode); + vm.set_global("test", Value::Number(test_val)); + let _ = vm.execute().unwrap(); + }) + }); +} + +criterion_group!(benches, criterion_benchmark); +criterion_main!(benches); diff --git a/docs/architecture.md b/docs/architecture.md new file mode 100644 index 0000000..20c5652 --- /dev/null +++ b/docs/architecture.md @@ -0,0 +1,91 @@ +# Genel Mimari + +dexpr, kaynak kodu parse edip bytecode'a derleyen ve register tabanlı bir VM üzerinde çalıştıran bir ifade değerlendirici (expression evaluator) ve bytecode VM'dir. + +--- + +## Pipeline + +``` +Kaynak Kod (.dexpr) + ↓ + [PARSER] ← PEG tabanlı gramer kuralları + ↓ + AST (Expr, Stmt, Value) + ↓ + [COMPILER] ← Tek geçişli derleme + ↓ + Bytecode (ham byte dizisi) + ↓ + [VM] ← 8 register, global'ler + ↓ + Sonuç (veya kaynak konum bilgili hata) +``` + +--- + +## Temel Tasarım Kararları + +1. **Register tabanlı VM:** Stack tabanlı VM'lere göre daha az komut, daha hızlı çalışma +2. **8 register limiti:** Basitlik ve hız arasında denge +3. **Tek geçişli derleme:** Fonksiyon desteği kaldırıldığı için iki geçişe gerek yok +4. **Label tabanlı atlamalar:** Son geçişte çözümlenir +5. **Span izleme:** Derleme ve çalışma zamanı hataları kaynak kod konumunu gösterir +6. **Value serileştirme:** Sabitler doğrudan bytecode'a gömülür +7. **Object tipi:** `IndexMap` tabanlı anahtar-değer nesneleri; özellik erişimi (`obj.field`), iç içe atama (`a.b.c = expr`) ve built-in metodlar (`keys`, `values`, `contains`, `get`, `length`) desteklenir +8. **Sadece global değişkenler:** Tüm değişkenler global scope'ta; host uygulamadan `set_global` ile değer aktarılır +9. **Bytecode cache:** Compile edilmiş bytecode saklanıp farklı global değerlerle tekrar çalıştırılabilir +10. **Harici fonksiyonlar:** Host fonksiyonları VM'de isimle kayıt edilir, runtime'da HashMap lookup ile çözümlenir +11. **Harici metodlar:** Tipe özel host metodları eklenebilir, built-in metodlar bulunamazsa kontrol edilir +12. **Expression return:** `execute()` son ExprStmt'ın değerini döndürür — tek satır formüller doğrudan sonuç verir + +--- + +## Tipik Kullanım + +```rust +use dexpr::{ast::value::Value, compiler::Compiler, parser, vm::VM}; + +// 1. Parse +let ast = parser::program(source_code)?; + +// 2. Compile +let mut compiler = Compiler::new(); +let bytecode = compiler.compile(ast)?; + +// 3. Execute (bytecode cache'lenip tekrar kullanılabilir) +let mut vm = VM::new(&bytecode); +vm.set_global("input", Value::Number(dec!(42))); +vm.register_function("getRate", |args| { Ok(Value::Number(dec!(34.5))) }); +let result = vm.execute()?; // Son expression'ın değerini döndürür +// veya: let output = vm.get_global("output"); +``` + +--- + +## Bağımlılıklar + +| Crate | Kullanım | +|-------|----------| +| `rust_decimal` | Keyfi hassasiyetli ondalık aritmetik | +| `peg` | PEG tabanlı parser üreteci | +| `smol_str` | Kısa string'ler için optimize edilmiş tip | +| `micromap` | Kompakt hashmap (global değişkenler için) | +| `bumpalo` | Bump allocator (hızlı bellek ayırma) | +| `thiserror` | Hata türleri için derive makrosu | +| `rustc-hash` | Hızlı hash fonksiyonu | +| `smallvec` | Stack-allocated vektörler | +| `indexmap` | Sıralı hashmap (Object tipi için) | + +--- + +## Modül Referansları + +- [AST Modülü](ast.md) — İfadeler, deyimler, değer türleri +- [Parser Modülü](parser.md) — Gramer kuralları, ayrıştırma +- [Opcodes Modülü](opcodes.md) — Bytecode komut seti +- [Bytecode Modülü](bytecode.md) — Serileştirme, disassembler +- [Compiler Modülü](compiler.md) — AST → bytecode dönüşümü +- [VM Modülü](vm.md) — Sanal makine, çalıştırma +- [Language Info Modülü](language_info.md) — Editör metadata üretimi +- [Editor Modülü](editor.md) — CodeMirror 6 dil desteği (codemirror-lang-dexpr) diff --git a/docs/ast.md b/docs/ast.md new file mode 100644 index 0000000..0c1c413 --- /dev/null +++ b/docs/ast.md @@ -0,0 +1,115 @@ +# AST (Abstract Syntax Tree) Modülü + +**Konum:** `src/ast/` + +AST modülü, parser tarafından üretilen ve compiler tarafından tüketilen ağaç yapısını tanımlar. Üç alt modülden oluşur: `expr.rs`, `stmt.rs`, `value.rs`. + +--- + +## Span & Spanned + +**Dosya:** `src/ast/expr.rs` + +`Span`, kaynak koddaki bir konumu (satır, sütun) temsil eder. 1-indexed'tir. + +```rust +struct Span { line: u32, column: u32 } +``` + +`Spanned`, herhangi bir AST node'unu kaynak kod konumuyla eşleştirir: + +```rust +struct Spanned { node: T, span: Span } +``` + +`dummy()` metodu test ve internal kullanım için varsayılan konum oluşturur. + +--- + +## Expr (İfadeler) + +**Dosya:** `src/ast/expr.rs` +**Type alias:** `SpannedExpr = Spanned` + +`Expr` enum'u tüm ifade türlerini kapsar: + +| Variant | Açıklama | Örnek | +|---------|----------|-------| +| `Value(Value)` | Sabit değer (literal) | `42`, `"hello"`, `true` | +| `Variable(SmolStr)` | Değişken referansı | `x`, `result` | +| `BinaryOp(Box, Op, Box)` | İkili operasyon | `a + b`, `x > 5` | +| `UnaryOp(Op, Box)` | Tekli operasyon | `-x`, `!flag` | +| `FunctionCall(SmolStr, Vec)` | Built-in fonksiyon çağrısı | `log(x)` | +| `MethodCall(Box, SmolStr, Vec)` | Metod çağrısı | `name.upper()`, `text.split(",")` | +| `PropertyAccess(Box, SmolStr)` | Özellik erişimi | `obj.field`, `person.name` | + +> **Not:** `FunctionCall` hem built-in (`log`) hem de harici (host) fonksiyonlar için kullanılır. Built-in olmayan fonksiyonlar `CallExternal` opcode'u ile derlenir ve VM tarafından runtime'da çözümlenir. + +--- + +## Op (Operatörler) + +**Dosya:** `src/ast/expr.rs` + +| Kategori | Operatörler | +|----------|-------------| +| Aritmetik | `Add`, `Sub`, `Mul`, `Div`, `Mod`, `Pow` | +| Karşılaştırma | `Lt`, `Lte`, `Gt`, `Gte`, `Eq`, `Neq` | +| Boolean | `And`, `Or`, `Not` | +| Üyelik | `In` (değer listede/string'de var mı) | +| Tekli | `Neg` (negatif) | + +--- + +## Stmt (İfadeler/Deyimler) + +**Dosya:** `src/ast/stmt.rs` +**Type alias:** `SpannedStmt = Spanned` + +| Variant | Açıklama | Sözdizimi | +|---------|----------|-----------| +| `Assignment(SmolStr, Box)` | Değişken ataması | `x = 5` | +| `ExprStmt(Box)` | İfade deyimi | `log(x)` | +| `If(Box, Vec, Option>)` | Koşullu deyim | `if x > 0 then ... end` | +| `PropertyAssignment(SmolStr, Vec, Box)` | Özellik ataması | `a.b.c = expr` | + +--- + +## Value (Çalışma Zamanı Değerleri) + +**Dosya:** `src/ast/value.rs` + +| Variant | Rust Tipi | Açıklama | +|---------|-----------|----------| +| `Null` | - | Boş değer | +| `Number(Decimal)` | `rust_decimal::Decimal` | Keyfi hassasiyetli ondalık sayı | +| `String(SmolStr)` | `smol_str::SmolStr` | Optimize edilmiş string | +| `Boolean(bool)` | `bool` | Mantıksal değer | +| `NumberList(Vec)` | `Vec` | Sayı listesi | +| `StringList(Vec)` | `Vec` | String listesi | +| `Object(IndexMap)` | `IndexMap` | Anahtar-değer nesnesi | + +### Serileştirme + +Her `Value` bytecode'a gömülebilir. Serileştirme formatı: + +1. **Tip etiketi** (1 byte): `NULL=0x00`, `NUMBER=0x01`, `STRING=0x02`, `BOOLEAN=0x03`, `NUMBER_LIST=0x04`, `STRING_LIST=0x05`, `OBJECT=0x06` +2. **Veri:** + - Number: 16 byte (Decimal serialization) + - String: 2-byte uzunluk + UTF-8 bytes + - Boolean: 1 byte (0 veya 1) + - NumberList: 2-byte count + her sayı için 16 byte + - StringList: 2-byte count + her string için (2-byte uzunluk + bytes) + - Object: 2-byte entry count + her girdi için (anahtar: 2-byte uzunluk + bytes, değer: rekürsif serialize) + +`serialize()` ve `deserialize()` metodları bu dönüşümü gerçekleştirir. + +--- + +## Modüller Arası İlişki + +``` +Parser --> Expr, Stmt, Value (AST üretir) +Compiler <-- Expr, Stmt, Value (AST tüketir, bytecode üretir) +VM <-- Value (çalışma zamanında değer olarak kullanılır) +``` diff --git a/docs/bytecode.md b/docs/bytecode.md new file mode 100644 index 0000000..47aed4f --- /dev/null +++ b/docs/bytecode.md @@ -0,0 +1,79 @@ +# Bytecode Modülü + +**Konum:** `src/bytecode.rs` + +Bytecode'un serileştirilmesi (yazma) ve deserileştirilmesi (okuma) işlemlerini sağlar. Compiler bytecode üretirken `BytecodeWriter`'ı, VM çalıştırırken `BytecodeReader`'ı kullanır. + +--- + +## BytecodeWriter + +Compiler tarafından bytecode üretmek için kullanılır. + +| Metod | Açıklama | +|-------|----------| +| `new()` | Boş writer oluştur | +| `write_byte(u8)` | Tek byte yaz | +| `write_u16(u16)` | Big-endian 16-bit tamsayı yaz | +| `write_u32(u32)` | Big-endian 32-bit tamsayı yaz | +| `write_register(u8)` | Register indeksi yaz | +| `write_string(SmolStr)` | String yaz (2-byte uzunluk + UTF-8) | +| `write_value(Value)` | Serileştirilmiş Value yaz | +| `position() -> usize` | Geçerli bytecode pozisyonu | +| `bytecode() -> &[u8]` | Bytecode'un immutable view'ı | +| `into_bytecode() -> Vec` | Writer'ı tüket, byte vektörü döndür | + +--- + +## BytecodeReader + +VM tarafından bytecode'u okumak için kullanılır. + +| Metod | Açıklama | +|-------|----------| +| `new(bytecode)` | Bytecode'dan reader oluştur | +| `read_byte() -> Result` | Tek byte oku | +| `read_u16() -> Result` | Big-endian 16-bit tamsayı oku | +| `read_u32() -> Result` | Big-endian 32-bit tamsayı oku | +| `read_register() -> Result` | Register indeksi oku | +| `read_string() -> Result` | String oku | +| `read_value() -> Result` | Value deserileştir ve oku | +| `position() -> usize` | Geçerli okuma pozisyonu | +| `set_position(usize)` | Pozisyona atla (bounds check ile) | +| `remaining() -> usize` | Kalan byte sayısı | + +--- + +## Veri Formatı + +Tüm çok-byte değerler **big-endian** formatında saklanır. + +### String Formatı +``` +[2 bytes: uzunluk (u16)] [N bytes: UTF-8 veri] +``` + +### Value Formatı +``` +[1 byte: tip etiketi] [N bytes: tipe göre veri] +``` + +Detaylı Value serileştirme formatı için [AST dokümantasyonuna](ast.md#serileştirme) bakın. + +--- + +## Bytecode Dump (Disassembler) + +**Konum:** `src/bytecode_dump.rs` + +`disassemble_bytecode(bytecode) -> Vec` fonksiyonu bytecode'u insan okunabilir formata çevirir: + +``` +0000: LoadConst r0, 42 +0008: StoreGlobal "x", r0 +000d: LoadGlobal r0, "x" +0014: Log r0 +0016: End +``` + +Bu araç debug ve geliştirme sürecinde bytecode'u incelemek için kullanılır. diff --git a/docs/compiler.md b/docs/compiler.md new file mode 100644 index 0000000..eb68a1b --- /dev/null +++ b/docs/compiler.md @@ -0,0 +1,150 @@ +# Compiler Modülü + +**Konum:** `src/compiler.rs` + +AST'yi bytecode'a dönüştürür. Tek geçişli (single-pass) derleme yapar. Tüm değişkenler global scope'tadır. + +--- + +## Konfigürasyon + +- `MAX_REGISTERS = 8` — Hesaplama için kullanılabilir register sayısı + +--- + +## Hata Türleri (CompileError) + +| Hata | Açıklama | +|------|----------| +| `UndefinedFunction(SmolStr)` | Tanımlanmamış fonksiyon (built-in dışı çağrı) | +| `RegisterLimitExceeded` | Register limiti aşıldı | +| `InvalidExpression(String)` | Geçersiz ifade | +| `InvalidStatement(String)` | Geçersiz deyim | +| `BytecodeError(String)` | Bytecode üretim hatası | + +--- + +## Compiler Yapısı + +```rust +struct Compiler { + writer: BytecodeWriter, + used_registers: Vec, + + // Jump address resolution + pending_jumps: Vec<(usize, usize)>, + labels: HashMap, + next_label: usize, + + // Debug info generation + debug_info: DebugInfo, + current_span: Span, +} +``` + +--- + +## Derleme Akışı + +### Ana Derleme: `compile(statements) -> Vec` + +Tek geçişli derleme süreci: + +``` +1. Deyimleri sırayla derle +2. End opcode'u yaz +3. Atlama adreslerini çözümle (resolve_jumps) +``` + +### Kaynak Koddan Derleme: `compile_from_source(source) -> (Vec, DebugInfo)` + +Parse ile birlikte pozisyon bilgisi de toplar ve `DebugInfo` üretir. + +--- + +## Deyim Derleme + +### Assignment (Atama) + +1. İfadeyi register'a derle +2. `StoreGlobal` emit et (tüm değişkenler global) + +### If Statement (Koşullu Deyim) + +``` +1. Koşulu register'a derle +2. Else ve end için label oluştur +3. JumpIfFalse → else label +4. Then dalını derle +5. Jump → end label +6. Else label'ını set et, else dalını derle +7. End label'ını set et +``` + +--- + +## İfade Derleme + +### Value (Sabit Değer) +- Register ayır → `LoadConst` emit et + +### Variable (Değişken) +- Register ayır → `LoadGlobal` emit et + +### BinaryOp (İkili Operasyon) +1. Sol operandı register'a derle +2. Sağ operandı register'a derle +3. Sonuç register'ı ayır +4. Uygun opcode'u emit et (Add, Sub, Mul, vs.) +5. **Özel durum:** String + String → `Concat` kullanılır +6. Operand register'ları serbest bırak + +### UnaryOp (Tekli Operasyon) +1. Operandı register'a derle +2. Sonuç register'ı ayır +3. `Neg` veya `Not` emit et + +### FunctionCall (Fonksiyon Çağrısı) + +- `log` built-in fonksiyonu: Argümanları derle → `Log` emit et → Null register döndür +- Diğer fonksiyonlar: `CallExternal` opcode emit edilir (VM tarafından runtime'da çözümlenir) + +### ExprStmt (İfade Deyimi) +- İfadeyi derle → `SetResult` emit et → Register'ı serbest bırak +- `SetResult`, VM'in `execute()` dönüş değerini belirler (son ExprStmt kazanır) + +### MethodCall (Metod Çağrısı) +- Nesneyi register'a derle +- Argümanları derle +- `MethodCall` emit et (sonuç, nesne, metod adı, argüman sayısı, argüman register'ları) + +### PropertyAccess (Özellik Erişimi) +- Nesneyi register'a derle +- `GetProperty` emit et (hedef register, nesne register, özellik adı string) + +### PropertyAssignment (Özellik Ataması) +- İç içe özellik zinciri (`a.b.c = expr`) için: + 1. Kök değişkeni `LoadGlobal` ile yükle + 2. Ara özellikler için `GetProperty` zinciri emit et + 3. Son özellik için `SetProperty` emit et + 4. Değiştirilmiş kök nesneyi `StoreGlobal` ile geri yaz + +--- + +## Register Yönetimi + +- `allocate_register() -> u8` — İlk boş register'ı bul, yoksa hata +- `free_register(reg)` — Register'ı kullanılabilir olarak işaretle +- Toplam 8 register limiti var + +--- + +## Label ve Jump Yönetimi + +| Metod | Açıklama | +|-------|----------| +| `create_label() -> usize` | Benzersiz label ID üret | +| `set_label(id)` | Label'ın bytecode pozisyonunu kaydet | +| `emit_jump_address(label) -> usize` | Placeholder yaz, çözümleme için kaydet | +| `emit_jump(label)` | Koşulsuz atlama emit et | +| `resolve_jumps()` | Tüm placeholder'ları gerçek adreslerle doldur | diff --git a/docs/editor.md b/docs/editor.md new file mode 100644 index 0000000..a3f6b60 --- /dev/null +++ b/docs/editor.md @@ -0,0 +1,266 @@ +# Editor Modülü (codemirror-lang-dexpr) + +**Konum:** `editor/` + +CodeMirror 6 için dexpr dil desteği kütüphanesi. Syntax highlighting, tip-bazlı autocomplete ve error-tolerant parsing sağlar. + +--- + +## Mimari + +``` +editor/ + src/ + dexpr.grammar ← Lezer gramer dosyası (kaynak) + parser.js ← Lezer tarafından üretilen parser (generated) + parser.terms.js ← Token tanımları (generated) + tokens.ts ← External tokenizer (else if → tek token) + language.ts ← LRLanguage tanımı + syntax highlighting tag'leri + highlight.ts ← Varsayılan renk teması + completions.ts ← Autocomplete: tip çıkarımı + metadata bazlı öneriler + index.ts ← Ana export: dexpr() fonksiyonu + demo.ts ← Test sayfası kaynak kodu + demo.html ← Test sayfası + dexpr.grammar ← (src altındaki asıl dosya) +``` + +### İki Parser Stratejisi + +| Taraf | Parser | Amaç | +|-------|--------|------| +| **Rust** (execution) | PEG (`peg` crate) | AST üretimi → derleme → VM çalıştırma | +| **Editor** (web) | Lezer | Syntax highlighting, error recovery, autocomplete | + +Dil küçük olduğundan (7 keyword, ~20 operatör) iki gramer dosyasını sync tutmak kolaydır. + +--- + +## Lezer Grammar + +**Dosya:** `src/dexpr.grammar` + +### Parse Kuralları + +| Kural | Açıklama | +|-------|----------| +| `Program` | `statement*` — üst düzey kural | +| `IfStatement` | `if expr then stmts (else if expr then stmts)* (else stmts)? end` | +| `Assignment` | `VariableName AssignOp expression` veya `VariableName (.PropertyName)+ AssignOp expression` | +| `PropertyAccess` | `expression.PropertyName` — nesne özellik erişimi | +| `ExprStatement` | Bağımsız ifade | +| `BinaryExpression` | İkili operatörler, öncelik sırasıyla | +| `UnaryExpression` | Tekli `-` ve `!` | +| `MethodCall` | `expression.PropertyName(args)` | +| `FunctionCall` | `VariableName(args)` | +| `ParenExpression` | `(expression)` | + +### Operatör Önceliği (düşükten yükseğe) + +1. `||` — mantıksal OR +2. `&&` — mantıksal AND +3. `==`, `!=`, `<`, `<=`, `>`, `>=`, `in` — karşılaştırma +4. `+`, `-` — toplama/çıkarma +5. `*`, `/`, `%` — çarpma/bölme/mod +6. `**` — üs alma (sağdan birleşimli) +7. `-`, `!` — tekli operatörler (prefix) +8. `.method()` — metod çağrısı +9. `name()` — fonksiyon çağrısı + +### External Tokenizer + +**Dosya:** `src/tokens.ts` + +`else if` iki ayrı keyword olarak yazılır ama Lezer'da tek token olarak tanınır (`elseIf`). External tokenizer `else` + boşluk + `if` dizisini tespit edip tek token üretir. Bu sayede `else if` zinciri ile nested `if` arasındaki belirsizlik (ambiguity) ortadan kalkar. + +### Keyword Yönetimi + +Keyword'ler `@extend` ile tanımlanır — `identifier` token'ından türetilir ama **her zaman** keyword olarak parse edilir. dexpr'de keyword'ler reserved'dır (`if`, `then`, `else`, `end`, `in`, `true`, `false`). + +### Error Recovery + +Lezer GLR parser kullanır. Bozuk/yarım kod yazılırken: +- Parse edilebilen kısımlar doğru tree node'ları üretir +- Hatalı kısımlar `⚠` (error) node'ları ile sarılır +- Editör yarım kodda bile syntax highlighting ve autocomplete sunabilir + +--- + +## Syntax Highlighting + +**Dosya:** `src/language.ts` (tag eşleştirme) + `src/highlight.ts` (renk teması) + +### Token → Tag Eşleştirmesi + +| Token | Lezer Tag | Varsayılan Renk | +|-------|-----------|-----------------| +| `if`, `then`, `else`, `end`, `in`, `elseIf` | `keyword` | `#7c3aed` (mor) | +| `true`, `false` | `bool` | `#d97706` (turuncu) | +| `"string"`, `'string'` | `string` | `#059669` (yeşil) | +| `42`, `3.14` | `number` | `#2563eb` (mavi) | +| `// comment`, `/* comment */` | `lineComment` / `blockComment` | `#9ca3af` (gri, italic) | +| `+`, `-`, `*`, `/`, `%`, `!`, `\|\|`, `&&` | `operator` | `#dc2626` (kırmızı) | +| `==`, `!=`, `<`, `<=`, `>`, `>=`, `=`, `**` | `compareOperator` | `#dc2626` (kırmızı) | +| `myVar` | `variableName` | `#1f2937` (koyu) | +| `.method` | `propertyName` | `#0891b2` (cyan) | +| `functionName()` | `function(variableName)` | `#9333ea` (mor) | + +Host uygulama `highlighting: false` vererek varsayılan temayı devre dışı bırakıp kendi temasını kullanabilir. + +--- + +## Autocomplete + +**Dosya:** `src/completions.ts` + +### Veri Kaynağı + +Autocomplete verileri `DexprLanguageInfo` arayüzü ile sağlanır. Bu veri Rust tarafında `LanguageInfo::to_json()` ile üretilir. Detaylar: [Language Info Modülü](language_info.md) + +```typescript +interface DexprLanguageInfo { + functions: FunctionInfo[]; + methods: Partial>; + variables?: VariableInfo[]; +} +``` + +### Tip Çıkarımı (Type Inference) + +Completions modülü Lezer syntax tree'sini kullanarak değişken tiplerini çıkarır: + +1. **Config'den gelen tipler:** `variables` dizisindeki her değişkenin tipi bilinir +2. **Assignment analizi:** `x = "hello"` → `x: String`, `y = 42` → `y: Number` +3. **Method dönüş tipi:** `z = name.split(",")` → `z: StringList` (`split` dönüş tipi bilinir) +4. **Binary expression:** `a = x + y` → string varsa `String`, number varsa `Number` + +Bu analiz her autocomplete tetiklendiğinde Lezer tree üzerinde yapılır. Bozuk kodda bile parse edilmiş assignment'lar doğru tip bilgisi verir. + +### Tetikleme Kuralları + +| Durum | Davranış | +|-------|----------| +| `identifier` yazılırken | Keyword, fonksiyon, değişken önerileri | +| `.` yazıldığında | Dot öncesi ifadenin tipine göre metod önerileri | +| `.` + tip bilinmiyor | Tüm metodlar (fallback) | +| `.` + `Number` tipi | Öneri yok (ondalık yazımıyla karışmaz) | +| String / comment içinde | Öneri yok | +| Ctrl+Space | Explicit tetikleme | + +### Metod Önerileri (tipe göre) + +| Dot Öncesi | Gösterilen Metodlar | +|------------|---------------------| +| `"hello".` | String metodları | +| `category.` (config'de `String`) | String metodları | +| `x.` (assignment'tan `String` çıkarıldı) | String metodları | +| `items.` (config'de `StringList`) | StringList metodları | +| `scores.` (config'de `NumberList`) | NumberList metodları | +| `obj.` (config'de `Object`) | Object metodları | +| `result.` (tip bilinmiyor) | Tüm metodlar | +| `42.` | Öneri yok | + +--- + +## Kurulum ve Build + +```bash +cd editor + +# Bağımlılıkları kur +bun install + +# Lezer parser'ı grammar'dan üret +npx lezer-generator src/dexpr.grammar -o src/parser.js + +# Kütüphaneyi build et +bun run build # → dist/index.js, dist/index.cjs, dist/index.d.ts + +# Demo'yu build et (test için) +bun run demo # → dist/demo.global.js + +# Demo'yu çalıştır +bunx serve . -p 3456 # → http://localhost:3456/demo.html +``` + +### Grammar Değişikliği Yapıldığında + +1. `src/dexpr.grammar` dosyasını düzenle +2. `npx lezer-generator src/dexpr.grammar -o src/parser.js` çalıştır +3. `bun run build` ile yeniden derle + +--- + +## Host Uygulama Entegrasyonu + +### 1. Rust Tarafı: Metadata Üretimi + +```rust +use dexpr::language_info::LanguageInfo; + +let mut info = LanguageInfo::builtin(); + +// VM'de register edilen her fonksiyon için: +info.add_function("getRate", "(code: String) -> Number", Some("Kur bilgisi")); + +// VM'de register edilen her metod için: +info.add_method("String", "toTitleCase", "() -> String", None); + +// VM'de set_global ile verilen her değişken için: +info.add_variable("price", "Number", None); +info.add_variable("category", "String", None); + +let json = info.to_json(); +``` + +### 2. Frontend Tarafı: Editör Oluşturma + +```typescript +import { EditorView, basicSetup } from "codemirror"; +import { EditorState } from "@codemirror/state"; +import { dexpr } from "codemirror-lang-dexpr"; + +// Rust'tan gelen JSON +const languageInfo = JSON.parse(jsonFromRust); + +new EditorView({ + state: EditorState.create({ + doc: "", + extensions: [basicSetup, dexpr(languageInfo)], + }), + parent: document.getElementById("editor")!, +}); +``` + +### 3. Dinamik Güncelleme + +Eğer host uygulama çalışma sırasında yeni fonksiyon/değişken eklerse, editörü yeni `languageInfo` ile yeniden oluşturmak gerekir. CodeMirror'un `EditorView.dispatch` ile extension'ları güncellemek mümkündür ama en basit yol editörü yeniden oluşturmaktır. + +--- + +## Export'lar + +### Ana Export + +| Export | Tip | Açıklama | +|--------|-----|----------| +| `dexpr(config)` | `Extension` | All-in-one: language + autocomplete + highlighting | + +### Granüler Export'lar + +| Export | Açıklama | +|--------|----------| +| `dexprLanguage` | Sadece `LRLanguage` tanımı | +| `dexprCompletion(info)` | Sadece autocomplete extension'ı | +| `dexprHighlighting()` | Sadece varsayılan renk teması | +| `dexprHighlightStyle` | `HighlightStyle` nesnesi (özelleştirme için) | +| `KEYWORDS` | Keyword completion listesi | + +### Tip Export'ları + +| Tip | Açıklama | +|-----|----------| +| `DexprLanguageInfo` | Metadata arayüzü (JSON yapısı) | +| `DexprType` | `"String" \| "Number" \| "Boolean" \| "NumberList" \| "StringList" \| "Object"` | +| `FunctionInfo` | Fonksiyon metadata'sı | +| `MethodInfo` | Metod metadata'sı | +| `VariableInfo` | Değişken metadata'sı | diff --git a/docs/embedding.md b/docs/embedding.md new file mode 100644 index 0000000..69f1cd3 --- /dev/null +++ b/docs/embedding.md @@ -0,0 +1,294 @@ +# dexpr Embedding Guide + +dexpr'i başka projelere embed etmenin iki yolu var: + +1. **Rust backend + Web frontend** — Rust tarafında çalıştırma, frontend'de editör +2. **Tamamen tarayıcıda (WASM)** — Hem çalıştırma hem editör tarayıcıda + +--- + +## Yol 1: Rust Backend + Web Frontend + +Tipik senaryo: kullanıcı editörde formül yazar, backend derler ve çalıştırır. + +### Rust tarafı + +```toml +# Cargo.toml +[dependencies] +dexpr = { path = "../dexpr" } # veya git/crates.io +rust_decimal_macros = "1.40" +indexmap = "2" +smol_str = "0.3" +``` + +```rust +use dexpr::{ast::value::Value, compiler::Compiler, vm::VM, language_info::LanguageInfo}; + +// ── 1. Verileri hazırla ── +// JSON'dan (API, DB, config, vb.) +let customer = Value::from_json(r#"{ + "name": "Alice", + "email": "alice@test.com", + "age": 30, + "active": true, + "tags": ["premium", "tr"] +}"#).unwrap(); + +let order = Value::from_json(r#"{ + "amount": 1500, + "currency": "TRY", + "items": ["laptop", "mouse"] +}"#).unwrap(); + +// ── 2. Editör metadata'sını üret (sayfa yüklenirken, 1 kez) ── +let mut info = LanguageInfo::builtin(); + +// Değişkenler — tip ve field bilgisi Value'dan otomatik çıkar +info.add_value("customer", &customer, Some("Müşteri bilgisi".into())); +info.add_value("order", &order, Some("Sipariş bilgisi".into())); +info.add_value("discount", &Value::Number(rust_decimal_macros::dec!(10)), None); + +// Host fonksiyonları +info.add_function("getRate", "(code: String) -> Number", Some("Döviz kuru")); +info.add_function("fetchPrice", "(sku: String) -> Number", None); + +let editor_json = info.to_json(); +// → bu JSON'ı bir endpoint ile frontend'e gönder + +// ── 3. Kullanıcının yazdığı kodu çalıştır ── +fn execute_dexpr( + source: &str, + globals: &[(&str, Value)], +) -> Result { + let mut compiler = Compiler::new(); + let (bytecode, debug_info) = compiler + .compile_from_source(source) + .map_err(|e| e.to_string())?; + + let mut vm = VM::new(&bytecode); + vm.set_debug_info(&debug_info); + + for (name, value) in globals { + vm.set_global(name, value.clone()); + } + + // Host fonksiyonları kaydet + vm.register_function("getRate", |args| { + // args[0]: currency code + Ok(Value::Number(rust_decimal_macros::dec!(34.5))) + }); + + vm.execute().map_err(|e| e.to_string()) +} + +// Kullanıcının formülü: +let result = execute_dexpr( + "order.amount * (1 - discount / 100)", + &[ + ("customer", customer), + ("order", order), + ("discount", Value::Number(rust_decimal_macros::dec!(10))), + ], +); +// → Ok(Number(1350)) +``` + +### Frontend tarafı + +```bash +npm install codemirror codemirror-lang-dexpr +``` + +```typescript +import { EditorView, basicSetup } from "codemirror"; +import { EditorState } from "@codemirror/state"; +import { dexpr } from "codemirror-lang-dexpr"; + +// ── 1. Backend'den metadata al ── +const langInfo = await fetch("/api/editor-metadata").then(r => r.json()); + +// ── 2. Editörü oluştur ── +const editor = new EditorView({ + state: EditorState.create({ + doc: "", + extensions: [basicSetup, dexpr(langInfo)], + }), + parent: document.getElementById("editor")!, +}); + +// ── 3. Çalıştır ── +async function run() { + const code = editor.state.doc.toString(); + const res = await fetch("/api/execute", { + method: "POST", + headers: { "Content-Type": "application/json" }, + body: JSON.stringify({ code }), + }); + const { result, error } = await res.json(); + document.getElementById("output")!.textContent = + error ?? JSON.stringify(result); +} +``` + +### Akış + +``` +Frontend Backend (Rust) +─────── ────────────── +GET /editor-metadata ──────────► LanguageInfo::to_json() +◄─────────────────────────────── JSON (functions, methods, variables+fields) + +dexpr(langInfo) + customer. → [name, email, age, ...] + customer.name. → [upper, lower, trim, ...] + +POST /execute { code } ────────► Compiler::compile_from_source() + VM::new() + set_global() + execute() +◄─────────────────────────────── { result: 1350 } +``` + +--- + +## Yol 2: Tamamen Tarayıcıda (WASM) + +Backend'e gerek yok. Parser, compiler, VM hepsi tarayıcıda çalışır. + +### Build + +```bash +cd wasm +wasm-pack build --target web --release +# → wasm/pkg/ altında JS + WASM + TypeScript types üretilir +``` + +`pkg/` içeriği: +- `dexpr_wasm_bg.wasm` (~370KB) — WASM binary +- `dexpr_wasm.js` — JS glue code (auto-init) +- `dexpr_wasm.d.ts` — TypeScript type definitions + +### Kullanım + +```html +
+ +

+
+
+```
+
+### API Referansı
+
+```typescript
+class DexprEngine {
+  constructor()
+
+  // Global değişken: JSON string olarak ver/al
+  setGlobal(name: string, json: string): void
+  getGlobal(name: string): string | undefined
+
+  // Çalıştır: kaynak kodu → sonuç JSON string
+  execute(source: string): string
+
+  // Host fonksiyonu kaydet (args ve return JSON string olarak)
+  registerFunction(name: string, fn: (argsJson: string) => string): void
+
+  // Editör metadata (otomatik güncellenir her setGlobal'de)
+  languageInfo(): string
+
+  // Editör autocomplete için fonksiyon bilgisi
+  addFunctionInfo(name: string, signature: string, doc?: string): void
+}
+```
+
+### Dikkat Edilmesi Gerekenler
+
+- **JSON string convention**: `setGlobal` ve `execute` JSON *string* alır/verir — `JSON.stringify()` ve `JSON.parse()` kullan
+- **Global sync**: `execute()` sonrası property assignment'lar (`customer.city = "Ankara"`) global'lere yansır — `getGlobal()` ile güncel halini al
+- **Host fonksiyonlar**: Args ve return JSON string — `(argsJson: string) => string`
+- **Editör metadata**: `setGlobal()` her çağrıldığında `languageInfo()` otomatik güncellenir (field tipleri Value'dan çıkarılır)
+- **WASM boyutu**: Release build ~370KB (gzip ile ~120KB)
+
+---
+
+## Karşılaştırma
+
+| | Rust Backend | WASM |
+|---|---|---|
+| **Çalıştırma** | Server'da | Tarayıcıda |
+| **Performans** | Native hız | ~2-3x native |
+| **Güvenlik** | Server-side validation | Client-side (güvenilir ortam) |
+| **Latency** | Network roundtrip | Anında |
+| **Deployment** | Backend deploy | Static dosya |
+| **Host fonksiyonlar** | Rust closure'ları | JS callback (JSON bridge) |
+| **DB/API erişimi** | Doğrudan | Fetch ile |
+
+**Öneri**: Güvenlik kritikse (fiyat hesaplama, kurallar) → Rust backend. İnteraktif preview/sandbox → WASM.
diff --git a/docs/language_info.md b/docs/language_info.md
new file mode 100644
index 0000000..c5ae710
--- /dev/null
+++ b/docs/language_info.md
@@ -0,0 +1,156 @@
+# Language Info Modülü
+
+**Konum:** `src/language_info.rs`
+
+Editör entegrasyonu için dil metadata'sı üretir. Built-in fonksiyonlar, tipe göre metodlar ve host-kayıtlı genişletmeleri JSON formatında dışa aktarır. Frontend editör kütüphanesi (`codemirror-lang-dexpr`) bu JSON'u alarak tip-bazlı autocomplete sağlar.
+
+---
+
+## Yapılar
+
+### FunctionInfo
+
+| Alan | Tip | Açıklama |
+|------|-----|----------|
+| `name` | `&'static str` | Fonksiyon adı |
+| `signature` | `&'static str` | İmza (örn: `"(min, max) -> Number"`) |
+| `doc` | `Option<&'static str>` | Opsiyonel açıklama |
+
+### MethodInfo
+
+| Alan | Tip | Açıklama |
+|------|-----|----------|
+| `name` | `&'static str` | Metod adı |
+| `signature` | `&'static str` | İmza (örn: `"() -> String"`) |
+| `doc` | `Option<&'static str>` | Opsiyonel açıklama |
+
+### VariableInfo
+
+| Alan | Tip | Açıklama |
+|------|-----|----------|
+| `name` | `String` | Değişken adı |
+| `type_name` | `String` | Tip adı: `String`, `Number`, `Boolean`, `NumberList`, `StringList`, `Object` |
+| `doc` | `Option` | Opsiyonel açıklama |
+
+### LanguageInfo
+
+Tüm metadata'yı toplayan ana yapı.
+
+| Alan | Tip | Açıklama |
+|------|-----|----------|
+| `functions` | `Vec` | Fonksiyon listesi |
+| `methods` | `Vec<(&'static str, Vec)>` | Tipe göre metod listesi |
+| `variables` | `Vec` | Değişken listesi |
+
+---
+
+## Metodlar
+
+### `LanguageInfo::builtin() -> Self`
+
+Tüm built-in fonksiyon ve metodları içeren yeni bir `LanguageInfo` oluşturur.
+
+**Built-in fonksiyonlar:** `log`, `rand`
+
+**Built-in metodlar (tipe göre):**
+
+| Tip | Metodlar |
+|-----|----------|
+| `String` | `upper`, `lower`, `trim`, `trimStart`, `trimEnd`, `split`, `replace`, `contains`, `startsWith`, `endsWith`, `length`, `charAt`, `substring` |
+| `Number` | *(yok)* |
+| `Boolean` | *(yok)* |
+| `NumberList` | `length`, `len`, `isEmpty`, `first`, `last`, `get`, `contains`, `indexOf`, `slice`, `reverse`, `sort`, `sum`, `avg`, `min`, `max` |
+| `StringList` | `length`, `len`, `isEmpty`, `first`, `last`, `get`, `contains`, `indexOf`, `slice`, `reverse`, `sort`, `join` |
+| `Object` | `keys`, `values`, `length`, `len`, `contains`, `get` |
+
+### `add_function(name, signature, doc)`
+
+Host-kayıtlı fonksiyon ekler (VM'deki `register_function` ile eşleşir).
+
+### `add_method(type_name, name, signature, doc)`
+
+Host-kayıtlı metod ekler (VM'deki `register_method` ile eşleşir). Belirtilen tipe ait metod listesine eklenir.
+
+### `add_variable(name, type_name, doc)`
+
+External değişken ekler (VM'deki `set_global` ile eşleşir). Editörde autocomplete ve tip-bazlı metod önerileri için kullanılır.
+
+### `to_json() -> String`
+
+Tüm metadata'yı JSON formatında serileştirir. Frontend editör kütüphanesine gönderilecek çıktıyı üretir.
+
+---
+
+## JSON Formatı
+
+`to_json()` çıktısı:
+
+```json
+{
+  "functions": [
+    {"name": "log", "signature": "(...args) -> null", "doc": "Print values to output"},
+    {"name": "getRate", "signature": "(code: String) -> Number", "doc": "Get exchange rate"}
+  ],
+  "methods": {
+    "String": [
+      {"name": "upper", "signature": "() -> String"},
+      {"name": "toTitleCase", "signature": "() -> String", "doc": "Custom host method"}
+    ],
+    "Number": [],
+    "NumberList": [
+      {"name": "sum", "signature": "() -> Number"}
+    ],
+    "StringList": [
+      {"name": "join", "signature": "(delim?: String) -> String"}
+    ]
+  },
+  "variables": [
+    {"name": "price", "type": "Number"},
+    {"name": "category", "type": "String", "doc": "Product category"}
+  ]
+}
+```
+
+---
+
+## Kullanım Örneği
+
+```rust
+use dexpr::language_info::LanguageInfo;
+
+// 1. Built-in metadata oluştur
+let mut info = LanguageInfo::builtin();
+
+// 2. Host fonksiyonları ekle (register_function ile eşleşmeli)
+info.add_function("getRate", "(code: String) -> Number", Some("Get exchange rate"));
+info.add_function("fetchPrice", "(sku: String) -> Number", None);
+
+// 3. Host metodları ekle (register_method ile eşleşmeli)
+info.add_method("String", "toTitleCase", "() -> String", None);
+
+// 4. External değişkenleri ekle (set_global ile eşleşmeli)
+info.add_variable("price", "Number", None);
+info.add_variable("category", "String", Some("Ürün kategorisi".to_string()));
+info.add_variable("items", "StringList", None);
+
+// 5. JSON üret ve frontend'e gönder
+let json = info.to_json();
+// json -> HTTP response, WebSocket message, vb.
+```
+
+---
+
+## Frontend Entegrasyonu
+
+Üretilen JSON doğrudan `codemirror-lang-dexpr` kütüphanesine verilir:
+
+```typescript
+import { dexpr } from "codemirror-lang-dexpr";
+
+// Rust'tan gelen JSON parse edilir
+const languageInfo = JSON.parse(jsonFromRust);
+
+const extensions = [basicSetup, dexpr(languageInfo)];
+```
+
+Detaylar için: [Editor Modülü](editor.md)
diff --git a/docs/opcodes.md b/docs/opcodes.md
new file mode 100644
index 0000000..e2584d5
--- /dev/null
+++ b/docs/opcodes.md
@@ -0,0 +1,95 @@
+# Opcodes Modülü
+
+**Konum:** `src/opcodes.rs`
+
+Bytecode komut setini (instruction set) tanımlar. Her opcode bir `u8` değerine karşılık gelir.
+
+---
+
+## OpCodeByte Enum
+
+### Register Operasyonları
+
+| Opcode | Değer | Açıklama |
+|--------|-------|----------|
+| `LoadConst` | `0x10` | Sabit değeri register'a yükle |
+| `Move` | `0x11` | Register'dan register'a kopyala |
+
+### Bellek Operasyonları
+
+| Opcode | Değer | Açıklama |
+|--------|-------|----------|
+| `LoadLocal` | `0x20` | Yerel değişkeni register'a yükle (ayrılmış) |
+| `StoreLocal` | `0x21` | Register'ı yerel değişkene kaydet (ayrılmış) |
+| `LoadGlobal` | `0x22` | Global değişkeni register'a yükle |
+| `StoreGlobal` | `0x23` | Register'ı global değişkene kaydet |
+
+> **Not:** `LoadLocal`/`StoreLocal` opcode'ları tanımlıdır ancak şu an compiler tarafından emit edilmez. Tüm değişkenler global scope'tadır.
+
+### Aritmetik
+
+| Opcode | Değer | Açıklama |
+|--------|-------|----------|
+| `Add` | `0x30` | Toplama |
+| `Sub` | `0x31` | Çıkarma |
+| `Mul` | `0x32` | Çarpma |
+| `Div` | `0x33` | Bölme |
+| `Neg` | `0x34` | Negatif (tekli) |
+| `Mod` | `0x35` | Mod alma |
+| `Pow` | `0x36` | Üs alma |
+
+### Karşılaştırma
+
+| Opcode | Değer | Açıklama |
+|--------|-------|----------|
+| `Lt` | `0x40` | Küçüktür |
+| `Lte` | `0x41` | Küçük eşit |
+| `Gt` | `0x42` | Büyüktür |
+| `Gte` | `0x43` | Büyük eşit |
+| `Eq` | `0x44` | Eşit |
+| `Neq` | `0x45` | Eşit değil |
+
+### Boolean Mantık
+
+| Opcode | Değer | Açıklama |
+|--------|-------|----------|
+| `And` | `0x50` | Mantıksal VE |
+| `Or` | `0x51` | Mantıksal VEYA |
+| `Not` | `0x52` | Mantıksal DEĞİL |
+
+### Kontrol Akışı
+
+| Opcode | Değer | Açıklama |
+|--------|-------|----------|
+| `Jump` | `0x60` | Koşulsuz atlama |
+| `JumpIfFalse` | `0x61` | Register false ise atla |
+
+### Üyelik Testi
+
+| Opcode | Değer | Açıklama |
+|--------|-------|----------|
+| `Contains` | `0x53` | Değer listede/string'de var mı kontrolü (`in` operatörü) |
+
+### Özel Operasyonlar
+
+| Opcode | Değer | Açıklama |
+|--------|-------|----------|
+| `Concat` | `0x80` | String birleştirme |
+| `MethodCall` | `0x90` | Metod çağrısı |
+| `GetProperty` | `0x91` | Nesne özelliği oku (dest, obj_reg, property_name_string) |
+| `SetProperty` | `0x92` | Nesne özelliği yaz (obj_reg, property_name_string, val_reg) |
+| `Log` | `0xA0` | Değer yazdır (built-in) |
+| `CallExternal` | `0xA1` | Harici (host) fonksiyon çağrısı |
+| `SetResult` | `0xB0` | İfade sonucunu kaydet (return value için) |
+| `End` | `0xFF` | Program sonu |
+
+---
+
+## Hızlı Lookup Tablosu
+
+`LOOKUP[256]` statik dizisi, O(1) karmaşıklıkta byte-to-opcode dönüşümü sağlar. `from_byte(u8)` metodu bu tabloyu kullanır.
+
+**Metodlar:**
+- `to_byte() -> u8` — Opcode'u byte'a dönüştür
+- `from_byte(u8) -> Option` — Byte'ı opcode'a dönüştür (lookup tablosu ile)
+- `name() -> &str` — İnsan okunabilir opcode adı
diff --git a/docs/parser.md b/docs/parser.md
new file mode 100644
index 0000000..f905761
--- /dev/null
+++ b/docs/parser.md
@@ -0,0 +1,115 @@
+# Parser Modülü
+
+**Konum:** `src/parser/`
+
+Parser, kaynak kodu AST'ye dönüştürür. PEG (Parsing Expression Grammar) tabanlıdır ve `peg` crate'ini kullanır.
+
+---
+
+## Giriş Noktaları
+
+**Dosya:** `src/parser/mod.rs`
+
+| Fonksiyon | Dönüş | Açıklama |
+|-----------|-------|----------|
+| `program(source)` | `Vec` | Tam programı parse eder |
+| `program_with_spans(source)` | `Vec<(usize, Stmt)>` | Byte offset'leriyle birlikte parse eder |
+
+### `offset_to_span(source, offset) -> Span`
+Byte offset'ini 1-indexed satır ve sütuna dönüştürür. UTF-8 karakter sınırlarını doğru şekilde hesaplar.
+
+---
+
+## Gramer Kuralları
+
+**Dosya:** `src/parser/grammar.rs`
+
+### Deyim (Statement) Ayrıştırma
+
+| Kural | Ürettiği | Sözdizimi |
+|-------|----------|-----------|
+| `statement()` | `Stmt` | Herhangi bir geçerli deyim |
+| `assignment()` | `Stmt::Assignment` | `x = expr` veya `x += expr` |
+| `property_assignment()` | `Stmt::PropertyAssignment` | `a.b.c = expr` |
+| `expr_stmt()` | `Stmt::ExprStmt` | Bağımsız ifade |
+| `if_stmt()` | `Stmt::If` | `if cond then ... [else ...] end` |
+
+**Bileşik atamalar:** `+=`, `-=`, `*=`, `/=`, `%=` operatörleri desugar edilir:
+- `x += e` → `x = x + e`
+
+**Özellik ataması:** `identifier ("." identifier)+ "=" expression` kalıbı ile nesne özelliklerine atama yapılır (örn: `a.b.c = 42`).
+
+**Else zincirleri:** `else if` yapısı desteklenir ve rekürsif olarak parse edilir.
+
+### İfade (Expression) Ayrıştırma - Öncelik Sırası
+
+En düşükten en yükseğe:
+
+1. Method çağrıları, fonksiyon çağrıları
+2. Mantıksal AND (`&&`)
+3. Mantıksal OR (`||`)
+4. Karşılaştırma (`==`, `!=`, `<`, `<=`, `>`, `>=`, `in`)
+5. Toplama/Çıkarma (`+`, `-`)
+6. Çarpma/Bölme/Mod (`*`, `/`, `%`)
+7. Üs alma (`**`) - sağdan birleşimli (right-associative)
+8. Tekli operatörler (`-`, `!`), atomik ifadeler
+
+### Postfix Kuralı
+
+`postfix()` kuralı, herhangi bir atom üzerinde `.property` (özellik erişimi) ve `.method(args)` (metod çağrısı) zincirlemesini sağlar. Atom parse edildikten sonra ardışık `.identifier` veya `.identifier(args)` kalıpları uygulanır:
+
+- `obj.field` → `Expr::PropertyAccess(obj, "field")`
+- `obj.method(args)` → `Expr::MethodCall(obj, "method", args)`
+- `obj.a.b.method()` → zincirleme erişim ve çağrı
+
+### Atomik İfadeler
+
+`atom()` kuralı temel ifade birimlerini parse eder:
+
+| Tür | Örnek | Ürettiği |
+|-----|-------|----------|
+| Tanımlayıcı | `myVar` | `Expr::Variable` |
+| Sayı | `42`, `3.14` | `Expr::Value(Number)` |
+| String | `"hello"`, `'world'` | `Expr::Value(String)` |
+| Boolean | `true`, `false` | `Expr::Value(Boolean)` |
+| Parantezli ifade | `(a + b)` | İç ifade |
+| Tekli negatif | `-x` | `Expr::UnaryOp(Neg, x)` |
+| Tekli NOT | `!flag` | `Expr::UnaryOp(Not, flag)` |
+
+### Literal Ayrıştırma
+
+- **Sayılar:** Ondalık kısım opsiyonel (`42`, `3.14`)
+- **Stringler:** Çift veya tek tırnak, escape sequence destekli
+- **Tanımlayıcılar:** Ayrılmış kelimelerle çakışmamalı
+
+### Ayrılmış Kelimeler
+
+`if`, `then`, `else`, `end`, `true`, `false`, `in`
+
+### Boşluk ve Yorumlar
+
+- Boşluklar: space, tab, newline
+- Satır yorumu: `// ...`
+- Blok yorumu: `/* ... */`
+
+---
+
+## Hata Yönetimi
+
+Parser hataları `peg` crate'inden gelir ve beklenen token/kural bilgisi içerir. `program_with_spans()` kullanıldığında byte offset'leri `offset_to_span()` ile satır/sütun bilgisine dönüştürülebilir.
+
+---
+
+## Kullanım Örneği
+
+```rust
+use dexpr::parser;
+
+let source = r#"
+    result = (3 + 4) * 2
+    log(result)
+"#;
+
+let ast = parser::program(source).expect("Parse error");
+// ast: Vec - Assignment, ExprStmt
+```
diff --git a/docs/vm.md b/docs/vm.md
new file mode 100644
index 0000000..f2faf3e
--- /dev/null
+++ b/docs/vm.md
@@ -0,0 +1,202 @@
+# VM (Virtual Machine) Modülü
+
+**Konum:** `src/vm/`
+
+Register tabanlı sanal makine. Bytecode'u çalıştırır, 8 register ve global değişken deposu içerir.
+
+---
+
+## Alt Modüller
+
+| Dosya | İçerik |
+|-------|--------|
+| `vm/mod.rs` | Modül export'ları |
+| `vm/vm.rs` | Ana VM implementasyonu |
+| `vm/error.rs` | Hata türleri (VMError) |
+| `vm/debug_info.rs` | Bytecode offset → kaynak konum eşleştirme |
+
+---
+
+## VMError (Hata Türleri)
+
+**Dosya:** `src/vm/error.rs`
+
+| Hata | Açıklama |
+|------|----------|
+| `TypeMismatch { expected, got }` | Tip uyuşmazlığı |
+| `UndefinedVariable(SmolStr)` | Tanımlanmamış değişken |
+| `DivisionByZero` | Sıfıra bölme |
+| `BytecodeError(String)` | Bozuk bytecode |
+| `MethodNotFound { type_name, method }` | Metod bulunamadı |
+| `RuntimeError(String)` | Genel çalışma zamanı hatası |
+| `InvalidOperation { operation, left_type, right_type }` | Desteklenmeyen operasyon |
+| `WithLocation { span, message }` | Kaynak konum bilgili hata |
+
+`with_span(span)` metodu hatayı kaynak konum bilgisi ile sarar (çift sarmalamayı önler).
+
+---
+
+## DebugInfo
+
+**Dosya:** `src/vm/debug_info.rs`
+
+Bytecode offset'lerini kaynak kod konumlarına (Span) eşleştirir. Run-length encoded yapıda: her girdi bir sonraki girdiye kadar geçerlidir.
+
+```rust
+struct DebugInfo {
+    entries: Vec<(u32, Span)>,  // sıralı (offset, span) çiftleri
+}
+```
+
+**Metodlar:**
+- `add_entry(offset, span)` — Eşleştirme ekle (artan offset sırasında)
+- `get_span(offset) -> Option` — Binary search ile konum bul
+
+---
+
+## VM Yapısı
+
+```rust
+struct VM<'a> {
+    // Bytecode durumu
+    bytecode: &'a [u8],
+    reader: BytecodeReader<'a>,
+    pc: usize,
+
+    // Hesaplama
+    registers: [Value; 8],      // 8 register
+
+    // Değişkenler
+    globals: Map, // Global kapsam (max 64 giriş)
+
+    // Kaynaklar
+    heap: Bump,                 // Bump allocator
+
+    // Debug
+    debug_info: Option,
+    debug: bool,                // Debug çıktısı (debug build'lerde)
+    opcode_counts: [usize; 256], // Profiling (debug build'lerde)
+}
+```
+
+---
+
+## Başlatma ve API
+
+| Metod | Açıklama |
+|-------|----------|
+| `new(bytecode)` | VM oluştur |
+| `set_debug_info(debug_info)` | Kaynak konum eşleştirmesi sağla |
+| `set_global(name, value)` | Global değişken ata |
+| `get_global(name) -> Option<&Value>` | Global değişken oku |
+| `register_function(name, fn)` | Harici (host) fonksiyon kaydet |
+| `register_method(type_name, method_name, fn)` | Tipe özel harici metod kaydet |
+| `reset()` | Durumu sıfırla, yeniden çalıştırmaya hazırla |
+
+---
+
+## Çalıştırma Döngüsü
+
+`execute() -> Result` (son expression'ın değerini döndürür):
+
+1. VM durumunu sıfırla
+2. Bytecode kaldığı sürece döngüde çalış:
+   - Opcode byte'ını oku
+   - İlgili handler'a yönlendir
+   - Hataları kaynak konum bilgisi ile sar
+   - Profiling verilerini güncelle (debug build)
+   - `End` opcode'unda dur
+
+---
+
+## Opcode Handler'ları
+
+### Register ve Bellek
+- **`handle_load_const()`** — Bytecode'dan değer oku, register'a koy
+- **`handle_move()`** — Register → register kopyala
+- **`handle_load_global()`** — Global map → register
+- **`handle_store_global()`** — Register → global map
+
+### Aritmetik
+- **`binary_op(f, name)`** — Genel handler: iki operand register'ı oku, fonksiyonu uygula, sonucu kaydet
+- Sıfıra bölme kontrolü yapılır
+- **`handle_neg()`** — Sadece Number tipinde tekli negatif
+
+### Karşılaştırma
+- **`compare_op(f, name)`** — Decimal değerler üzerinde karşılaştırma, Boolean döndürür
+
+### Boolean
+- **`handle_and()`**, **`handle_or()`**, **`handle_not()`** — Boolean register'lar üzerinde mantık operasyonları
+
+### Kontrol Akışı
+- **`handle_jump()`** — 4-byte adres oku, reader pozisyonunu ayarla
+- **`handle_jump_if_false()`** — Register `Boolean(false)` ise atla
+
+### String, Nesne ve Metodlar
+- **`handle_concat()`** — İki String register'ını birleştir
+- **`handle_get_property()`** — Object register'ından alan oku, alan yoksa `Null` döndür
+- **`handle_set_property()`** — Object register'ında alan değerini ayarla
+- **`handle_method_call()`** — Nesne register'ı, metod adı, argümanlar
+  - **String metodları:** `upper`, `lower`, `trim`, `trimStart`, `trimEnd`, `split(delimiter)`, `replace(old, new)`, `startsWith(prefix)`, `endsWith(suffix)`, `contains(substr)`, `length`, `charAt(index)`, `substring(start, end?)`
+  - **StringList metodları:** `length`/`len`, `isEmpty`, `first`, `last`, `get(index)`, `contains(value)`, `indexOf(value)`, `slice(start, end?)`, `reverse()`, `sort()`, `join(delimiter?)`
+  - **NumberList metodları:** `length`/`len`, `isEmpty`, `first`, `last`, `get(index)`, `contains(value)`, `indexOf(value)`, `slice(start, end?)`, `reverse()`, `sort()`, `sum`, `avg`, `min`, `max`
+  - **Object metodları:** `keys()`, `values()`, `length`/`len()`, `contains(key)`, `get(key)`
+  - **Harici metodlar:** Yukarıdaki built-in metodlar bulunamazsa `external_methods` HashMap'inde aranır
+
+### Üyelik Testi
+- **`handle_contains()`** — `in` operatörü: String in StringList, Number in NumberList, String in String (substring), String in Object (anahtar varlığı kontrolü)
+
+### Harici Fonksiyonlar ve Sonuç
+- **`handle_call_external()`** — İsimle harici fonksiyon çağır (HashMap lookup)
+- **`handle_set_result()`** — ExprStmt sonucunu `last_result`'a kaydet
+
+### Built-in
+- **`handle_log()`** — Register değerini stdout'a yazdır
+- **`rand(min, max)`** — min ile max arasında rastgele tamsayı üret (varsayılan harici fonksiyon)
+
+---
+
+## Yardımcı Metodlar
+
+| Metod | Açıklama |
+|-------|----------|
+| `read_register_checked()` | Register oku ve doğrula |
+| `validate_register()` | Register indeks sınır kontrolü |
+| `read_jump_address()` | 4-byte adres oku ve sınır kontrolü yap |
+| `set_position(addr)` | Reader pozisyonunu doğrulayarak ayarla |
+| `wrap_error(err)` | Hataya kaynak konum bilgisi ekle |
+| `debug_print_state()` | Debug çıktısı (debug build) |
+| `print_profile_summary()` | Opcode çalışma sayıları (debug build) |
+
+---
+
+## Harici Fonksiyon ve Metod Kaydı
+
+```rust
+// Harici fonksiyon
+vm.register_function("getRate", |args| {
+    match &args[0] {
+        Value::String(currency) => Ok(Value::Number(dec!(34.5))),
+        _ => Err("expected string".to_string()),
+    }
+});
+
+// Tipe özel harici metod
+vm.register_method("Number", "format", |this, args| {
+    // this: &Value, args: &[Value]
+    Ok(Value::String("formatted".into()))
+});
+```
+
+**Tip isimleri:** `"Number"`, `"String"`, `"Boolean"`, `"NumberList"`, `"StringList"`, `"Object"`, `"Null"`
+
+---
+
+## Çalışma Modeli Özeti
+
+- **Register tabanlı:** 8 register ile hesaplama
+- **Global depo:** SmolStr → Value map'i
+- **Harici fonksiyonlar:** İsimle çözümlenen host fonksiyonları (HashMap lookup)
+- **Harici metodlar:** Tipe özel host metodları
+- **Expression return:** Son ExprStmt'ın değeri `execute()` dönüş değeri olarak verilir
+- **Dinamik tip sistemi:** Tip uyuşmazlıklarında çalışma zamanı hatası
diff --git a/editor/bun.lock b/editor/bun.lock
new file mode 100644
index 0000000..527ca74
--- /dev/null
+++ b/editor/bun.lock
@@ -0,0 +1,257 @@
+{
+  "lockfileVersion": 1,
+  "configVersion": 1,
+  "workspaces": {
+    "": {
+      "name": "codemirror-lang-dexpr",
+      "devDependencies": {
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+        "@codemirror/language": "^6.0.0",
+        "@codemirror/state": "^6.0.0",
+        "@codemirror/view": "^6.0.0",
+        "@lezer/generator": "^1.8.0",
+        "@lezer/highlight": "^1.0.0",
+        "@lezer/lr": "^1.4.8",
+        "codemirror": "^6.0.2",
+        "tsup": "^8.0.0",
+        "typescript": "^5.0.0",
+      },
+      "peerDependencies": {
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+        "@codemirror/language": "^6.0.0",
+        "@codemirror/state": "^6.0.0",
+        "@codemirror/view": "^6.0.0",
+        "@lezer/highlight": "^1.0.0",
+      },
+    },
+  },
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+    "ts-interface-checker": ["ts-interface-checker@0.1.13", "", {}, "sha512-Y/arvbn+rrz3JCKl9C4kVNfTfSm2/mEp5FSz5EsZSANGPSlQrpRI5M4PKF+mJnE52jOO90PnPSc3Ur3bTQw0gA=="],
+
+    "tsup": ["tsup@8.5.1", "", { "dependencies": { "bundle-require": "^5.1.0", "cac": "^6.7.14", "chokidar": "^4.0.3", "consola": "^3.4.0", "debug": "^4.4.0", "esbuild": "^0.27.0", "fix-dts-default-cjs-exports": "^1.0.0", "joycon": "^3.1.1", "picocolors": "^1.1.1", "postcss-load-config": "^6.0.1", "resolve-from": "^5.0.0", "rollup": "^4.34.8", "source-map": "^0.7.6", "sucrase": "^3.35.0", "tinyexec": "^0.3.2", "tinyglobby": "^0.2.11", "tree-kill": "^1.2.2" }, "peerDependencies": { "@microsoft/api-extractor": "^7.36.0", "@swc/core": "^1", "postcss": "^8.4.12", "typescript": ">=4.5.0" }, "optionalPeers": ["@microsoft/api-extractor", "@swc/core", "postcss", "typescript"], "bin": { "tsup": "dist/cli-default.js", "tsup-node": "dist/cli-node.js" } }, "sha512-xtgkqwdhpKWr3tKPmCkvYmS9xnQK3m3XgxZHwSUjvfTjp7YfXe5tT3GgWi0F2N+ZSMsOeWeZFh7ZZFg5iPhing=="],
+
+    "typescript": ["typescript@5.9.3", "", { "bin": { "tsc": "bin/tsc", "tsserver": "bin/tsserver" } }, "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw=="],
+
+    "ufo": ["ufo@1.6.3", "", {}, "sha512-yDJTmhydvl5lJzBmy/hyOAA0d+aqCBuwl818haVdYCRrWV84o7YyeVm4QlVHStqNrrJSTb6jKuFAVqAFsr+K3Q=="],
+
+    "w3c-keyname": ["w3c-keyname@2.2.8", "", {}, "sha512-dpojBhNsCNN7T82Tm7k26A6G9ML3NkhDsnw9n/eoxSRlVBB4CEtIQ/KTCLI2Fwf3ataSXRhYFkQi3SlnFwPvPQ=="],
+  }
+}
diff --git a/editor/demo.html b/editor/demo.html
new file mode 100644
index 0000000..3f0b100
--- /dev/null
+++ b/editor/demo.html
@@ -0,0 +1,19 @@
+
+
+
+  
+  dexpr Editor Demo
+  
+
+
+  
dexpr Editor

+  

+  
Type to see syntax highlighting. Press Ctrl+Space for autocomplete. Try typing a dot after a variable for method suggestions.

+  
+
+
diff --git a/editor/demo.ts b/editor/demo.ts
new file mode 100644
index 0000000..220d113
--- /dev/null
+++ b/editor/demo.ts
@@ -0,0 +1,151 @@
+import { EditorView, basicSetup } from "codemirror";
+import { EditorState } from "@codemirror/state";
+import { dexpr, DexprLanguageInfo } from "./src/index";
+
+// ── Simulate: this JSON comes from Rust's LanguageInfo::to_json() ──
+// In a real app:
+//   Rust:  info.add_value("customer", &Value::from_json(json)?, None);
+//          let metadata = info.to_json();
+//   HTTP:  GET /api/editor-metadata → metadata
+//   JS:    const languageInfo = await fetch(...).then(r => r.json());
+//
+// Here we inline it for the demo:
+
+const languageInfo: DexprLanguageInfo = {
+  functions: [
+    { name: "log", signature: "(...args) -> null", doc: "Print values to output" },
+    { name: "rand", signature: "(min, max) -> Number", doc: "Random integer between min and max" },
+    { name: "getRate", signature: "(code: String) -> Number", doc: "Get exchange rate for currency" },
+  ],
+  methods: {
+    String: [
+      { name: "upper", signature: "() -> String" },
+      { name: "lower", signature: "() -> String" },
+      { name: "trim", signature: "() -> String" },
+      { name: "trimStart", signature: "() -> String" },
+      { name: "trimEnd", signature: "() -> String" },
+      { name: "split", signature: "(delim: String) -> StringList" },
+      { name: "replace", signature: "(old: String, new: String) -> String" },
+      { name: "contains", signature: "(substr: String) -> Boolean" },
+      { name: "startsWith", signature: "(prefix: String) -> Boolean" },
+      { name: "endsWith", signature: "(suffix: String) -> Boolean" },
+      { name: "length", signature: "() -> Number" },
+      { name: "charAt", signature: "(index: Number) -> String" },
+      { name: "substring", signature: "(start: Number, end?: Number) -> String" },
+    ],
+    Number: [],
+    Boolean: [],
+    Object: [
+      { name: "keys", signature: "() -> StringList", doc: "Get all keys" },
+      { name: "values", signature: "() -> StringList | NumberList", doc: "Get all values (must be same type)" },
+      { name: "length", signature: "() -> Number", doc: "Number of entries" },
+      { name: "len", signature: "() -> Number" },
+      { name: "contains", signature: "(key: String) -> Boolean", doc: "Check if key exists" },
+      { name: "get", signature: "(key: String) -> any", doc: "Get value by key" },
+    ],
+    NumberList: [
+      { name: "length", signature: "() -> Number" },
+      { name: "len", signature: "() -> Number" },
+      { name: "isEmpty", signature: "() -> Boolean" },
+      { name: "first", signature: "() -> Number" },
+      { name: "last", signature: "() -> Number" },
+      { name: "get", signature: "(index: Number) -> Number" },
+      { name: "contains", signature: "(value: Number) -> Boolean" },
+      { name: "indexOf", signature: "(value: Number) -> Number" },
+      { name: "slice", signature: "(start: Number, end?: Number) -> NumberList" },
+      { name: "reverse", signature: "() -> NumberList" },
+      { name: "sort", signature: "() -> NumberList" },
+      { name: "sum", signature: "() -> Number" },
+      { name: "avg", signature: "() -> Number" },
+      { name: "min", signature: "() -> Number" },
+      { name: "max", signature: "() -> Number" },
+    ],
+    StringList: [
+      { name: "length", signature: "() -> Number" },
+      { name: "len", signature: "() -> Number" },
+      { name: "isEmpty", signature: "() -> Boolean" },
+      { name: "first", signature: "() -> String" },
+      { name: "last", signature: "() -> String" },
+      { name: "get", signature: "(index: Number) -> String" },
+      { name: "contains", signature: "(value: String) -> Boolean" },
+      { name: "indexOf", signature: "(value: String) -> Number" },
+      { name: "slice", signature: "(start: Number, end?: Number) -> StringList" },
+      { name: "reverse", signature: "() -> StringList" },
+      { name: "sort", signature: "() -> StringList" },
+      { name: "join", signature: "(delim?: String) -> String" },
+    ],
+  },
+  // ── Variables: as if Rust did info.add_value("customer", &Value::from_json(...), ...) ──
+  variables: [
+    // info.add_value("discount", &Value::Number(10), None)
+    { name: "discount", type: "Number", doc: "Discount percentage" },
+    // info.add_value("customer", &Value::from_json(r#"{"name":"Alice",...}"#)?, None)
+    // → from_json auto-detects field types from the JSON values
+    {
+      name: "customer", type: "Object", doc: "Customer — from JSON via Value::from_json()",
+      fields: [
+        { name: "name", type: "String" },
+        { name: "email", type: "String" },
+        { name: "city", type: "String" },
+        { name: "age", type: "Number" },
+        { name: "active", type: "Boolean" },
+        { name: "tags", type: "StringList" },
+      ],
+    },
+    // info.add_value("order", &Value::from_json(r#"{"amount":1500,...}"#)?, None)
+    {
+      name: "order", type: "Object", doc: "Order — from JSON via Value::from_json()",
+      fields: [
+        { name: "amount", type: "Number" },
+        { name: "currency", type: "String" },
+        { name: "status", type: "String" },
+        { name: "items", type: "StringList" },
+      ],
+    },
+  ],
+};
+
+const sampleCode = `// dexpr demo
+// customer and order come from JSON via Value::from_json()
+// Rust side:
+//   let customer = Value::from_json(api_response)?;
+//   vm.set_global("customer", customer.clone());
+//   info.add_value("customer", &customer, None);
+
+// Property access — type-aware autocomplete
+name = customer.name
+city = customer.city
+
+// Object fields in expressions
+net = order.amount * (1 - discount / 100)
+
+// Method chaining: obj.field → String methods
+upper_name = customer.name.upper()
+domain = customer.email.split("@").last()
+
+// Object methods
+fields = customer.keys()
+fieldCount = customer.length()
+
+// in operator — check key existence
+if "email" in customer then
+  log(customer.email)
+end
+
+// Property assignment
+customer.city = "Ankara"
+
+// List field methods
+first_tag = customer.tags.first()
+tag_count = customer.tags.length()
+
+log(upper_name, net, first_tag)
+`;
+
+new EditorView({
+  state: EditorState.create({
+    doc: sampleCode,
+    extensions: [basicSetup, dexpr(languageInfo)],
+  }),
+  parent: document.getElementById("editor")!,
+});
diff --git a/editor/dist/demo.global.js b/editor/dist/demo.global.js
new file mode 100644
index 0000000..0ea1f73
--- /dev/null
+++ b/editor/dist/demo.global.js
@@ -0,0 +1,24777 @@
+"use strict";
+(() => {
+  // node_modules/@marijn/find-cluster-break/src/index.js
+  var rangeFrom = [];
+  var rangeTo = [];
+  (() => {
+    let numbers = "lc,34,7n,7,7b,19,,,,2,,2,,,20,b,1c,l,g,,2t,7,2,6,2,2,,4,z,,u,r,2j,b,1m,9,9,,o,4,,9,,3,,5,17,3,3b,f,,w,1j,,,,4,8,4,,3,7,a,2,t,,1m,,,,2,4,8,,9,,a,2,q,,2,2,1l,,4,2,4,2,2,3,3,,u,2,3,,b,2,1l,,4,5,,2,4,,k,2,m,6,,,1m,,,2,,4,8,,7,3,a,2,u,,1n,,,,c,,9,,14,,3,,1l,3,5,3,,4,7,2,b,2,t,,1m,,2,,2,,3,,5,2,7,2,b,2,s,2,1l,2,,,2,4,8,,9,,a,2,t,,20,,4,,2,3,,,8,,29,,2,7,c,8,2q,,2,9,b,6,22,2,r,,,,,,1j,e,,5,,2,5,b,,10,9,,2u,4,,6,,2,2,2,p,2,4,3,g,4,d,,2,2,6,,f,,jj,3,qa,3,t,3,t,2,u,2,1s,2,,7,8,,2,b,9,,19,3,3b,2,y,,3a,3,4,2,9,,6,3,63,2,2,,1m,,,7,,,,,2,8,6,a,2,,1c,h,1r,4,1c,7,,,5,,14,9,c,2,w,4,2,2,,3,1k,,,2,3,,,3,1m,8,2,2,48,3,,d,,7,4,,6,,3,2,5i,1m,,5,ek,,5f,x,2da,3,3x,,2o,w,fe,6,2x,2,n9w,4,,a,w,2,28,2,7k,,3,,4,,p,2,5,,47,2,q,i,d,,12,8,p,b,1a,3,1c,,2,4,2,2,13,,1v,6,2,2,2,2,c,,8,,1b,,1f,,,3,2,2,5,2,,,16,2,8,,6m,,2,,4,,fn4,,kh,g,g,g,a6,2,gt,,6a,,45,5,1ae,3,,2,5,4,14,3,4,,4l,2,fx,4,ar,2,49,b,4w,,1i,f,1k,3,1d,4,2,2,1x,3,10,5,,8,1q,,c,2,1g,9,a,4,2,,2n,3,2,,,2,6,,4g,,3,8,l,2,1l,2,,,,,m,,e,7,3,5,5f,8,2,3,,,n,,29,,2,6,,,2,,,2,,2,6j,,2,4,6,2,,2,r,2,2d,8,2,,,2,2y,,,,2,6,,,2t,3,2,4,,5,77,9,,2,6t,,a,2,,,4,,40,4,2,2,4,,w,a,14,6,2,4,8,,9,6,2,3,1a,d,,2,ba,7,,6,,,2a,m,2,7,,2,,2,3e,6,3,,,2,,7,,,20,2,3,,,,9n,2,f0b,5,1n,7,t4,,1r,4,29,,f5k,2,43q,,,3,4,5,8,8,2,7,u,4,44,3,1iz,1j,4,1e,8,,e,,m,5,,f,11s,7,,h,2,7,,2,,5,79,7,c5,4,15s,7,31,7,240,5,gx7k,2o,3k,6o".split(",").map((s) => s ? parseInt(s, 36) : 1);
+    for (let i = 0, n = 0; i < numbers.length; i++)
+      (i % 2 ? rangeTo : rangeFrom).push(n = n + numbers[i]);
+  })();
+  function isExtendingChar(code) {
+    if (code < 768) return false;
+    for (let from = 0, to = rangeFrom.length; ; ) {
+      let mid = from + to >> 1;
+      if (code < rangeFrom[mid]) to = mid;
+      else if (code >= rangeTo[mid]) from = mid + 1;
+      else return true;
+      if (from == to) return false;
+    }
+  }
+  function isRegionalIndicator(code) {
+    return code >= 127462 && code <= 127487;
+  }
+  var ZWJ = 8205;
+  function findClusterBreak(str, pos, forward = true, includeExtending = true) {
+    return (forward ? nextClusterBreak : prevClusterBreak)(str, pos, includeExtending);
+  }
+  function nextClusterBreak(str, pos, includeExtending) {
+    if (pos == str.length) return pos;
+    if (pos && surrogateLow(str.charCodeAt(pos)) && surrogateHigh(str.charCodeAt(pos - 1))) pos--;
+    let prev = codePointAt(str, pos);
+    pos += codePointSize(prev);
+    while (pos < str.length) {
+      let next = codePointAt(str, pos);
+      if (prev == ZWJ || next == ZWJ || includeExtending && isExtendingChar(next)) {
+        pos += codePointSize(next);
+        prev = next;
+      } else if (isRegionalIndicator(next)) {
+        let countBefore = 0, i = pos - 2;
+        while (i >= 0 && isRegionalIndicator(codePointAt(str, i))) {
+          countBefore++;
+          i -= 2;
+        }
+        if (countBefore % 2 == 0) break;
+        else pos += 2;
+      } else {
+        break;
+      }
+    }
+    return pos;
+  }
+  function prevClusterBreak(str, pos, includeExtending) {
+    while (pos > 0) {
+      let found = nextClusterBreak(str, pos - 2, includeExtending);
+      if (found < pos) return found;
+      pos--;
+    }
+    return 0;
+  }
+  function codePointAt(str, pos) {
+    let code0 = str.charCodeAt(pos);
+    if (!surrogateHigh(code0) || pos + 1 == str.length) return code0;
+    let code1 = str.charCodeAt(pos + 1);
+    if (!surrogateLow(code1)) return code0;
+    return (code0 - 55296 << 10) + (code1 - 56320) + 65536;
+  }
+  function surrogateLow(ch) {
+    return ch >= 56320 && ch < 57344;
+  }
+  function surrogateHigh(ch) {
+    return ch >= 55296 && ch < 56320;
+  }
+  function codePointSize(code) {
+    return code < 65536 ? 1 : 2;
+  }
+
+  // node_modules/@codemirror/state/dist/index.js
+  var Text = class _Text {
+    /**
+    Get the line description around the given position.
+    */
+    lineAt(pos) {
+      if (pos < 0 || pos > this.length)
+        throw new RangeError(`Invalid position ${pos} in document of length ${this.length}`);
+      return this.lineInner(pos, false, 1, 0);
+    }
+    /**
+    Get the description for the given (1-based) line number.
+    */
+    line(n) {
+      if (n < 1 || n > this.lines)
+        throw new RangeError(`Invalid line number ${n} in ${this.lines}-line document`);
+      return this.lineInner(n, true, 1, 0);
+    }
+    /**
+    Replace a range of the text with the given content.
+    */
+    replace(from, to, text) {
+      [from, to] = clip(this, from, to);
+      let parts = [];
+      this.decompose(
+        0,
+        from,
+        parts,
+        2
+        /* Open.To */
+      );
+      if (text.length)
+        text.decompose(
+          0,
+          text.length,
+          parts,
+          1 | 2
+          /* Open.To */
+        );
+      this.decompose(
+        to,
+        this.length,
+        parts,
+        1
+        /* Open.From */
+      );
+      return TextNode.from(parts, this.length - (to - from) + text.length);
+    }
+    /**
+    Append another document to this one.
+    */
+    append(other) {
+      return this.replace(this.length, this.length, other);
+    }
+    /**
+    Retrieve the text between the given points.
+    */
+    slice(from, to = this.length) {
+      [from, to] = clip(this, from, to);
+      let parts = [];
+      this.decompose(from, to, parts, 0);
+      return TextNode.from(parts, to - from);
+    }
+    /**
+    Test whether this text is equal to another instance.
+    */
+    eq(other) {
+      if (other == this)
+        return true;
+      if (other.length != this.length || other.lines != this.lines)
+        return false;
+      let start = this.scanIdentical(other, 1), end = this.length - this.scanIdentical(other, -1);
+      let a = new RawTextCursor(this), b = new RawTextCursor(other);
+      for (let skip = start, pos = start; ; ) {
+        a.next(skip);
+        b.next(skip);
+        skip = 0;
+        if (a.lineBreak != b.lineBreak || a.done != b.done || a.value != b.value)
+          return false;
+        pos += a.value.length;
+        if (a.done || pos >= end)
+          return true;
+      }
+    }
+    /**
+    Iterate over the text. When `dir` is `-1`, iteration happens
+    from end to start. This will return lines and the breaks between
+    them as separate strings.
+    */
+    iter(dir = 1) {
+      return new RawTextCursor(this, dir);
+    }
+    /**
+    Iterate over a range of the text. When `from` > `to`, the
+    iterator will run in reverse.
+    */
+    iterRange(from, to = this.length) {
+      return new PartialTextCursor(this, from, to);
+    }
+    /**
+    Return a cursor that iterates over the given range of lines,
+    _without_ returning the line breaks between, and yielding empty
+    strings for empty lines.
+    
+    When `from` and `to` are given, they should be 1-based line numbers.
+    */
+    iterLines(from, to) {
+      let inner;
+      if (from == null) {
+        inner = this.iter();
+      } else {
+        if (to == null)
+          to = this.lines + 1;
+        let start = this.line(from).from;
+        inner = this.iterRange(start, Math.max(start, to == this.lines + 1 ? this.length : to <= 1 ? 0 : this.line(to - 1).to));
+      }
+      return new LineCursor(inner);
+    }
+    /**
+    Return the document as a string, using newline characters to
+    separate lines.
+    */
+    toString() {
+      return this.sliceString(0);
+    }
+    /**
+    Convert the document to an array of lines (which can be
+    deserialized again via [`Text.of`](https://codemirror.net/6/docs/ref/#state.Text^of)).
+    */
+    toJSON() {
+      let lines = [];
+      this.flatten(lines);
+      return lines;
+    }
+    /**
+    @internal
+    */
+    constructor() {
+    }
+    /**
+    Create a `Text` instance for the given array of lines.
+    */
+    static of(text) {
+      if (text.length == 0)
+        throw new RangeError("A document must have at least one line");
+      if (text.length == 1 && !text[0])
+        return _Text.empty;
+      return text.length <= 32 ? new TextLeaf(text) : TextNode.from(TextLeaf.split(text, []));
+    }
+  };
+  var TextLeaf = class _TextLeaf extends Text {
+    constructor(text, length = textLength(text)) {
+      super();
+      this.text = text;
+      this.length = length;
+    }
+    get lines() {
+      return this.text.length;
+    }
+    get children() {
+      return null;
+    }
+    lineInner(target, isLine, line, offset) {
+      for (let i = 0; ; i++) {
+        let string2 = this.text[i], end = offset + string2.length;
+        if ((isLine ? line : end) >= target)
+          return new Line(offset, end, line, string2);
+        offset = end + 1;
+        line++;
+      }
+    }
+    decompose(from, to, target, open) {
+      let text = from <= 0 && to >= this.length ? this : new _TextLeaf(sliceText(this.text, from, to), Math.min(to, this.length) - Math.max(0, from));
+      if (open & 1) {
+        let prev = target.pop();
+        let joined = appendText(text.text, prev.text.slice(), 0, text.length);
+        if (joined.length <= 32) {
+          target.push(new _TextLeaf(joined, prev.length + text.length));
+        } else {
+          let mid = joined.length >> 1;
+          target.push(new _TextLeaf(joined.slice(0, mid)), new _TextLeaf(joined.slice(mid)));
+        }
+      } else {
+        target.push(text);
+      }
+    }
+    replace(from, to, text) {
+      if (!(text instanceof _TextLeaf))
+        return super.replace(from, to, text);
+      [from, to] = clip(this, from, to);
+      let lines = appendText(this.text, appendText(text.text, sliceText(this.text, 0, from)), to);
+      let newLen = this.length + text.length - (to - from);
+      if (lines.length <= 32)
+        return new _TextLeaf(lines, newLen);
+      return TextNode.from(_TextLeaf.split(lines, []), newLen);
+    }
+    sliceString(from, to = this.length, lineSep = "\n") {
+      [from, to] = clip(this, from, to);
+      let result = "";
+      for (let pos = 0, i = 0; pos <= to && i < this.text.length; i++) {
+        let line = this.text[i], end = pos + line.length;
+        if (pos > from && i)
+          result += lineSep;
+        if (from < end && to > pos)
+          result += line.slice(Math.max(0, from - pos), to - pos);
+        pos = end + 1;
+      }
+      return result;
+    }
+    flatten(target) {
+      for (let line of this.text)
+        target.push(line);
+    }
+    scanIdentical() {
+      return 0;
+    }
+    static split(text, target) {
+      let part = [], len = -1;
+      for (let line of text) {
+        part.push(line);
+        len += line.length + 1;
+        if (part.length == 32) {
+          target.push(new _TextLeaf(part, len));
+          part = [];
+          len = -1;
+        }
+      }
+      if (len > -1)
+        target.push(new _TextLeaf(part, len));
+      return target;
+    }
+  };
+  var TextNode = class _TextNode extends Text {
+    constructor(children, length) {
+      super();
+      this.children = children;
+      this.length = length;
+      this.lines = 0;
+      for (let child of children)
+        this.lines += child.lines;
+    }
+    lineInner(target, isLine, line, offset) {
+      for (let i = 0; ; i++) {
+        let child = this.children[i], end = offset + child.length, endLine = line + child.lines - 1;
+        if ((isLine ? endLine : end) >= target)
+          return child.lineInner(target, isLine, line, offset);
+        offset = end + 1;
+        line = endLine + 1;
+      }
+    }
+    decompose(from, to, target, open) {
+      for (let i = 0, pos = 0; pos <= to && i < this.children.length; i++) {
+        let child = this.children[i], end = pos + child.length;
+        if (from <= end && to >= pos) {
+          let childOpen = open & ((pos <= from ? 1 : 0) | (end >= to ? 2 : 0));
+          if (pos >= from && end <= to && !childOpen)
+            target.push(child);
+          else
+            child.decompose(from - pos, to - pos, target, childOpen);
+        }
+        pos = end + 1;
+      }
+    }
+    replace(from, to, text) {
+      [from, to] = clip(this, from, to);
+      if (text.lines < this.lines)
+        for (let i = 0, pos = 0; i < this.children.length; i++) {
+          let child = this.children[i], end = pos + child.length;
+          if (from >= pos && to <= end) {
+            let updated = child.replace(from - pos, to - pos, text);
+            let totalLines = this.lines - child.lines + updated.lines;
+            if (updated.lines < totalLines >> 5 - 1 && updated.lines > totalLines >> 5 + 1) {
+              let copy = this.children.slice();
+              copy[i] = updated;
+              return new _TextNode(copy, this.length - (to - from) + text.length);
+            }
+            return super.replace(pos, end, updated);
+          }
+          pos = end + 1;
+        }
+      return super.replace(from, to, text);
+    }
+    sliceString(from, to = this.length, lineSep = "\n") {
+      [from, to] = clip(this, from, to);
+      let result = "";
+      for (let i = 0, pos = 0; i < this.children.length && pos <= to; i++) {
+        let child = this.children[i], end = pos + child.length;
+        if (pos > from && i)
+          result += lineSep;
+        if (from < end && to > pos)
+          result += child.sliceString(from - pos, to - pos, lineSep);
+        pos = end + 1;
+      }
+      return result;
+    }
+    flatten(target) {
+      for (let child of this.children)
+        child.flatten(target);
+    }
+    scanIdentical(other, dir) {
+      if (!(other instanceof _TextNode))
+        return 0;
+      let length = 0;
+      let [iA, iB, eA, eB] = dir > 0 ? [0, 0, this.children.length, other.children.length] : [this.children.length - 1, other.children.length - 1, -1, -1];
+      for (; ; iA += dir, iB += dir) {
+        if (iA == eA || iB == eB)
+          return length;
+        let chA = this.children[iA], chB = other.children[iB];
+        if (chA != chB)
+          return length + chA.scanIdentical(chB, dir);
+        length += chA.length + 1;
+      }
+    }
+    static from(children, length = children.reduce((l, ch) => l + ch.length + 1, -1)) {
+      let lines = 0;
+      for (let ch of children)
+        lines += ch.lines;
+      if (lines < 32) {
+        let flat = [];
+        for (let ch of children)
+          ch.flatten(flat);
+        return new TextLeaf(flat, length);
+      }
+      let chunk = Math.max(
+        32,
+        lines >> 5
+        /* Tree.BranchShift */
+      ), maxChunk = chunk << 1, minChunk = chunk >> 1;
+      let chunked = [], currentLines = 0, currentLen = -1, currentChunk = [];
+      function add2(child) {
+        let last;
+        if (child.lines > maxChunk && child instanceof _TextNode) {
+          for (let node of child.children)
+            add2(node);
+        } else if (child.lines > minChunk && (currentLines > minChunk || !currentLines)) {
+          flush();
+          chunked.push(child);
+        } else if (child instanceof TextLeaf && currentLines && (last = currentChunk[currentChunk.length - 1]) instanceof TextLeaf && child.lines + last.lines <= 32) {
+          currentLines += child.lines;
+          currentLen += child.length + 1;
+          currentChunk[currentChunk.length - 1] = new TextLeaf(last.text.concat(child.text), last.length + 1 + child.length);
+        } else {
+          if (currentLines + child.lines > chunk)
+            flush();
+          currentLines += child.lines;
+          currentLen += child.length + 1;
+          currentChunk.push(child);
+        }
+      }
+      function flush() {
+        if (currentLines == 0)
+          return;
+        chunked.push(currentChunk.length == 1 ? currentChunk[0] : _TextNode.from(currentChunk, currentLen));
+        currentLen = -1;
+        currentLines = currentChunk.length = 0;
+      }
+      for (let child of children)
+        add2(child);
+      flush();
+      return chunked.length == 1 ? chunked[0] : new _TextNode(chunked, length);
+    }
+  };
+  Text.empty = /* @__PURE__ */ new TextLeaf([""], 0);
+  function textLength(text) {
+    let length = -1;
+    for (let line of text)
+      length += line.length + 1;
+    return length;
+  }
+  function appendText(text, target, from = 0, to = 1e9) {
+    for (let pos = 0, i = 0, first = true; i < text.length && pos <= to; i++) {
+      let line = text[i], end = pos + line.length;
+      if (end >= from) {
+        if (end > to)
+          line = line.slice(0, to - pos);
+        if (pos < from)
+          line = line.slice(from - pos);
+        if (first) {
+          target[target.length - 1] += line;
+          first = false;
+        } else
+          target.push(line);
+      }
+      pos = end + 1;
+    }
+    return target;
+  }
+  function sliceText(text, from, to) {
+    return appendText(text, [""], from, to);
+  }
+  var RawTextCursor = class {
+    constructor(text, dir = 1) {
+      this.dir = dir;
+      this.done = false;
+      this.lineBreak = false;
+      this.value = "";
+      this.nodes = [text];
+      this.offsets = [dir > 0 ? 1 : (text instanceof TextLeaf ? text.text.length : text.children.length) << 1];
+    }
+    nextInner(skip, dir) {
+      this.done = this.lineBreak = false;
+      for (; ; ) {
+        let last = this.nodes.length - 1;
+        let top2 = this.nodes[last], offsetValue = this.offsets[last], offset = offsetValue >> 1;
+        let size = top2 instanceof TextLeaf ? top2.text.length : top2.children.length;
+        if (offset == (dir > 0 ? size : 0)) {
+          if (last == 0) {
+            this.done = true;
+            this.value = "";
+            return this;
+          }
+          if (dir > 0)
+            this.offsets[last - 1]++;
+          this.nodes.pop();
+          this.offsets.pop();
+        } else if ((offsetValue & 1) == (dir > 0 ? 0 : 1)) {
+          this.offsets[last] += dir;
+          if (skip == 0) {
+            this.lineBreak = true;
+            this.value = "\n";
+            return this;
+          }
+          skip--;
+        } else if (top2 instanceof TextLeaf) {
+          let next = top2.text[offset + (dir < 0 ? -1 : 0)];
+          this.offsets[last] += dir;
+          if (next.length > Math.max(0, skip)) {
+            this.value = skip == 0 ? next : dir > 0 ? next.slice(skip) : next.slice(0, next.length - skip);
+            return this;
+          }
+          skip -= next.length;
+        } else {
+          let next = top2.children[offset + (dir < 0 ? -1 : 0)];
+          if (skip > next.length) {
+            skip -= next.length;
+            this.offsets[last] += dir;
+          } else {
+            if (dir < 0)
+              this.offsets[last]--;
+            this.nodes.push(next);
+            this.offsets.push(dir > 0 ? 1 : (next instanceof TextLeaf ? next.text.length : next.children.length) << 1);
+          }
+        }
+      }
+    }
+    next(skip = 0) {
+      if (skip < 0) {
+        this.nextInner(-skip, -this.dir);
+        skip = this.value.length;
+      }
+      return this.nextInner(skip, this.dir);
+    }
+  };
+  var PartialTextCursor = class {
+    constructor(text, start, end) {
+      this.value = "";
+      this.done = false;
+      this.cursor = new RawTextCursor(text, start > end ? -1 : 1);
+      this.pos = start > end ? text.length : 0;
+      this.from = Math.min(start, end);
+      this.to = Math.max(start, end);
+    }
+    nextInner(skip, dir) {
+      if (dir < 0 ? this.pos <= this.from : this.pos >= this.to) {
+        this.value = "";
+        this.done = true;
+        return this;
+      }
+      skip += Math.max(0, dir < 0 ? this.pos - this.to : this.from - this.pos);
+      let limit = dir < 0 ? this.pos - this.from : this.to - this.pos;
+      if (skip > limit)
+        skip = limit;
+      limit -= skip;
+      let { value } = this.cursor.next(skip);
+      this.pos += (value.length + skip) * dir;
+      this.value = value.length <= limit ? value : dir < 0 ? value.slice(value.length - limit) : value.slice(0, limit);
+      this.done = !this.value;
+      return this;
+    }
+    next(skip = 0) {
+      if (skip < 0)
+        skip = Math.max(skip, this.from - this.pos);
+      else if (skip > 0)
+        skip = Math.min(skip, this.to - this.pos);
+      return this.nextInner(skip, this.cursor.dir);
+    }
+    get lineBreak() {
+      return this.cursor.lineBreak && this.value != "";
+    }
+  };
+  var LineCursor = class {
+    constructor(inner) {
+      this.inner = inner;
+      this.afterBreak = true;
+      this.value = "";
+      this.done = false;
+    }
+    next(skip = 0) {
+      let { done, lineBreak, value } = this.inner.next(skip);
+      if (done && this.afterBreak) {
+        this.value = "";
+        this.afterBreak = false;
+      } else if (done) {
+        this.done = true;
+        this.value = "";
+      } else if (lineBreak) {
+        if (this.afterBreak) {
+          this.value = "";
+        } else {
+          this.afterBreak = true;
+          this.next();
+        }
+      } else {
+        this.value = value;
+        this.afterBreak = false;
+      }
+      return this;
+    }
+    get lineBreak() {
+      return false;
+    }
+  };
+  if (typeof Symbol != "undefined") {
+    Text.prototype[Symbol.iterator] = function() {
+      return this.iter();
+    };
+    RawTextCursor.prototype[Symbol.iterator] = PartialTextCursor.prototype[Symbol.iterator] = LineCursor.prototype[Symbol.iterator] = function() {
+      return this;
+    };
+  }
+  var Line = class {
+    /**
+    @internal
+    */
+    constructor(from, to, number2, text) {
+      this.from = from;
+      this.to = to;
+      this.number = number2;
+      this.text = text;
+    }
+    /**
+    The length of the line (not including any line break after it).
+    */
+    get length() {
+      return this.to - this.from;
+    }
+  };
+  function clip(text, from, to) {
+    from = Math.max(0, Math.min(text.length, from));
+    return [from, Math.max(from, Math.min(text.length, to))];
+  }
+  function findClusterBreak2(str, pos, forward = true, includeExtending = true) {
+    return findClusterBreak(str, pos, forward, includeExtending);
+  }
+  function surrogateLow2(ch) {
+    return ch >= 56320 && ch < 57344;
+  }
+  function surrogateHigh2(ch) {
+    return ch >= 55296 && ch < 56320;
+  }
+  function codePointAt2(str, pos) {
+    let code0 = str.charCodeAt(pos);
+    if (!surrogateHigh2(code0) || pos + 1 == str.length)
+      return code0;
+    let code1 = str.charCodeAt(pos + 1);
+    if (!surrogateLow2(code1))
+      return code0;
+    return (code0 - 55296 << 10) + (code1 - 56320) + 65536;
+  }
+  function fromCodePoint(code) {
+    if (code <= 65535)
+      return String.fromCharCode(code);
+    code -= 65536;
+    return String.fromCharCode((code >> 10) + 55296, (code & 1023) + 56320);
+  }
+  function codePointSize2(code) {
+    return code < 65536 ? 1 : 2;
+  }
+  var DefaultSplit = /\r\n?|\n/;
+  var MapMode = /* @__PURE__ */ (function(MapMode2) {
+    MapMode2[MapMode2["Simple"] = 0] = "Simple";
+    MapMode2[MapMode2["TrackDel"] = 1] = "TrackDel";
+    MapMode2[MapMode2["TrackBefore"] = 2] = "TrackBefore";
+    MapMode2[MapMode2["TrackAfter"] = 3] = "TrackAfter";
+    return MapMode2;
+  })(MapMode || (MapMode = {}));
+  var ChangeDesc = class _ChangeDesc {
+    // Sections are encoded as pairs of integers. The first is the
+    // length in the current document, and the second is -1 for
+    // unaffected sections, and the length of the replacement content
+    // otherwise. So an insertion would be (0, n>0), a deletion (n>0,
+    // 0), and a replacement two positive numbers.
+    /**
+    @internal
+    */
+    constructor(sections) {
+      this.sections = sections;
+    }
+    /**
+    The length of the document before the change.
+    */
+    get length() {
+      let result = 0;
+      for (let i = 0; i < this.sections.length; i += 2)
+        result += this.sections[i];
+      return result;
+    }
+    /**
+    The length of the document after the change.
+    */
+    get newLength() {
+      let result = 0;
+      for (let i = 0; i < this.sections.length; i += 2) {
+        let ins = this.sections[i + 1];
+        result += ins < 0 ? this.sections[i] : ins;
+      }
+      return result;
+    }
+    /**
+    False when there are actual changes in this set.
+    */
+    get empty() {
+      return this.sections.length == 0 || this.sections.length == 2 && this.sections[1] < 0;
+    }
+    /**
+    Iterate over the unchanged parts left by these changes. `posA`
+    provides the position of the range in the old document, `posB`
+    the new position in the changed document.
+    */
+    iterGaps(f) {
+      for (let i = 0, posA = 0, posB = 0; i < this.sections.length; ) {
+        let len = this.sections[i++], ins = this.sections[i++];
+        if (ins < 0) {
+          f(posA, posB, len);
+          posB += len;
+        } else {
+          posB += ins;
+        }
+        posA += len;
+      }
+    }
+    /**
+    Iterate over the ranges changed by these changes. (See
+    [`ChangeSet.iterChanges`](https://codemirror.net/6/docs/ref/#state.ChangeSet.iterChanges) for a
+    variant that also provides you with the inserted text.)
+    `fromA`/`toA` provides the extent of the change in the starting
+    document, `fromB`/`toB` the extent of the replacement in the
+    changed document.
+    
+    When `individual` is true, adjacent changes (which are kept
+    separate for [position mapping](https://codemirror.net/6/docs/ref/#state.ChangeDesc.mapPos)) are
+    reported separately.
+    */
+    iterChangedRanges(f, individual = false) {
+      iterChanges(this, f, individual);
+    }
+    /**
+    Get a description of the inverted form of these changes.
+    */
+    get invertedDesc() {
+      let sections = [];
+      for (let i = 0; i < this.sections.length; ) {
+        let len = this.sections[i++], ins = this.sections[i++];
+        if (ins < 0)
+          sections.push(len, ins);
+        else
+          sections.push(ins, len);
+      }
+      return new _ChangeDesc(sections);
+    }
+    /**
+    Compute the combined effect of applying another set of changes
+    after this one. The length of the document after this set should
+    match the length before `other`.
+    */
+    composeDesc(other) {
+      return this.empty ? other : other.empty ? this : composeSets(this, other);
+    }
+    /**
+    Map this description, which should start with the same document
+    as `other`, over another set of changes, so that it can be
+    applied after it. When `before` is true, map as if the changes
+    in `this` happened before the ones in `other`.
+    */
+    mapDesc(other, before = false) {
+      return other.empty ? this : mapSet(this, other, before);
+    }
+    mapPos(pos, assoc = -1, mode = MapMode.Simple) {
+      let posA = 0, posB = 0;
+      for (let i = 0; i < this.sections.length; ) {
+        let len = this.sections[i++], ins = this.sections[i++], endA = posA + len;
+        if (ins < 0) {
+          if (endA > pos)
+            return posB + (pos - posA);
+          posB += len;
+        } else {
+          if (mode != MapMode.Simple && endA >= pos && (mode == MapMode.TrackDel && posA < pos && endA > pos || mode == MapMode.TrackBefore && posA < pos || mode == MapMode.TrackAfter && endA > pos))
+            return null;
+          if (endA > pos || endA == pos && assoc < 0 && !len)
+            return pos == posA || assoc < 0 ? posB : posB + ins;
+          posB += ins;
+        }
+        posA = endA;
+      }
+      if (pos > posA)
+        throw new RangeError(`Position ${pos} is out of range for changeset of length ${posA}`);
+      return posB;
+    }
+    /**
+    Check whether these changes touch a given range. When one of the
+    changes entirely covers the range, the string `"cover"` is
+    returned.
+    */
+    touchesRange(from, to = from) {
+      for (let i = 0, pos = 0; i < this.sections.length && pos <= to; ) {
+        let len = this.sections[i++], ins = this.sections[i++], end = pos + len;
+        if (ins >= 0 && pos <= to && end >= from)
+          return pos < from && end > to ? "cover" : true;
+        pos = end;
+      }
+      return false;
+    }
+    /**
+    @internal
+    */
+    toString() {
+      let result = "";
+      for (let i = 0; i < this.sections.length; ) {
+        let len = this.sections[i++], ins = this.sections[i++];
+        result += (result ? " " : "") + len + (ins >= 0 ? ":" + ins : "");
+      }
+      return result;
+    }
+    /**
+    Serialize this change desc to a JSON-representable value.
+    */
+    toJSON() {
+      return this.sections;
+    }
+    /**
+    Create a change desc from its JSON representation (as produced
+    by [`toJSON`](https://codemirror.net/6/docs/ref/#state.ChangeDesc.toJSON).
+    */
+    static fromJSON(json) {
+      if (!Array.isArray(json) || json.length % 2 || json.some((a) => typeof a != "number"))
+        throw new RangeError("Invalid JSON representation of ChangeDesc");
+      return new _ChangeDesc(json);
+    }
+    /**
+    @internal
+    */
+    static create(sections) {
+      return new _ChangeDesc(sections);
+    }
+  };
+  var ChangeSet = class _ChangeSet extends ChangeDesc {
+    constructor(sections, inserted) {
+      super(sections);
+      this.inserted = inserted;
+    }
+    /**
+    Apply the changes to a document, returning the modified
+    document.
+    */
+    apply(doc2) {
+      if (this.length != doc2.length)
+        throw new RangeError("Applying change set to a document with the wrong length");
+      iterChanges(this, (fromA, toA, fromB, _toB, text) => doc2 = doc2.replace(fromB, fromB + (toA - fromA), text), false);
+      return doc2;
+    }
+    mapDesc(other, before = false) {
+      return mapSet(this, other, before, true);
+    }
+    /**
+    Given the document as it existed _before_ the changes, return a
+    change set that represents the inverse of this set, which could
+    be used to go from the document created by the changes back to
+    the document as it existed before the changes.
+    */
+    invert(doc2) {
+      let sections = this.sections.slice(), inserted = [];
+      for (let i = 0, pos = 0; i < sections.length; i += 2) {
+        let len = sections[i], ins = sections[i + 1];
+        if (ins >= 0) {
+          sections[i] = ins;
+          sections[i + 1] = len;
+          let index = i >> 1;
+          while (inserted.length < index)
+            inserted.push(Text.empty);
+          inserted.push(len ? doc2.slice(pos, pos + len) : Text.empty);
+        }
+        pos += len;
+      }
+      return new _ChangeSet(sections, inserted);
+    }
+    /**
+    Combine two subsequent change sets into a single set. `other`
+    must start in the document produced by `this`. If `this` goes
+    `docA` → `docB` and `other` represents `docB` → `docC`, the
+    returned value will represent the change `docA` → `docC`.
+    */
+    compose(other) {
+      return this.empty ? other : other.empty ? this : composeSets(this, other, true);
+    }
+    /**
+    Given another change set starting in the same document, maps this
+    change set over the other, producing a new change set that can be
+    applied to the document produced by applying `other`. When
+    `before` is `true`, order changes as if `this` comes before
+    `other`, otherwise (the default) treat `other` as coming first.
+    
+    Given two changes `A` and `B`, `A.compose(B.map(A))` and
+    `B.compose(A.map(B, true))` will produce the same document. This
+    provides a basic form of [operational
+    transformation](https://en.wikipedia.org/wiki/Operational_transformation),
+    and can be used for collaborative editing.
+    */
+    map(other, before = false) {
+      return other.empty ? this : mapSet(this, other, before, true);
+    }
+    /**
+    Iterate over the changed ranges in the document, calling `f` for
+    each, with the range in the original document (`fromA`-`toA`)
+    and the range that replaces it in the new document
+    (`fromB`-`toB`).
+    
+    When `individual` is true, adjacent changes are reported
+    separately.
+    */
+    iterChanges(f, individual = false) {
+      iterChanges(this, f, individual);
+    }
+    /**
+    Get a [change description](https://codemirror.net/6/docs/ref/#state.ChangeDesc) for this change
+    set.
+    */
+    get desc() {
+      return ChangeDesc.create(this.sections);
+    }
+    /**
+    @internal
+    */
+    filter(ranges) {
+      let resultSections = [], resultInserted = [], filteredSections = [];
+      let iter = new SectionIter(this);
+      done: for (let i = 0, pos = 0; ; ) {
+        let next = i == ranges.length ? 1e9 : ranges[i++];
+        while (pos < next || pos == next && iter.len == 0) {
+          if (iter.done)
+            break done;
+          let len = Math.min(iter.len, next - pos);
+          addSection(filteredSections, len, -1);
+          let ins = iter.ins == -1 ? -1 : iter.off == 0 ? iter.ins : 0;
+          addSection(resultSections, len, ins);
+          if (ins > 0)
+            addInsert(resultInserted, resultSections, iter.text);
+          iter.forward(len);
+          pos += len;
+        }
+        let end = ranges[i++];
+        while (pos < end) {
+          if (iter.done)
+            break done;
+          let len = Math.min(iter.len, end - pos);
+          addSection(resultSections, len, -1);
+          addSection(filteredSections, len, iter.ins == -1 ? -1 : iter.off == 0 ? iter.ins : 0);
+          iter.forward(len);
+          pos += len;
+        }
+      }
+      return {
+        changes: new _ChangeSet(resultSections, resultInserted),
+        filtered: ChangeDesc.create(filteredSections)
+      };
+    }
+    /**
+    Serialize this change set to a JSON-representable value.
+    */
+    toJSON() {
+      let parts = [];
+      for (let i = 0; i < this.sections.length; i += 2) {
+        let len = this.sections[i], ins = this.sections[i + 1];
+        if (ins < 0)
+          parts.push(len);
+        else if (ins == 0)
+          parts.push([len]);
+        else
+          parts.push([len].concat(this.inserted[i >> 1].toJSON()));
+      }
+      return parts;
+    }
+    /**
+    Create a change set for the given changes, for a document of the
+    given length, using `lineSep` as line separator.
+    */
+    static of(changes, length, lineSep) {
+      let sections = [], inserted = [], pos = 0;
+      let total = null;
+      function flush(force = false) {
+        if (!force && !sections.length)
+          return;
+        if (pos < length)
+          addSection(sections, length - pos, -1);
+        let set = new _ChangeSet(sections, inserted);
+        total = total ? total.compose(set.map(total)) : set;
+        sections = [];
+        inserted = [];
+        pos = 0;
+      }
+      function process2(spec) {
+        if (Array.isArray(spec)) {
+          for (let sub of spec)
+            process2(sub);
+        } else if (spec instanceof _ChangeSet) {
+          if (spec.length != length)
+            throw new RangeError(`Mismatched change set length (got ${spec.length}, expected ${length})`);
+          flush();
+          total = total ? total.compose(spec.map(total)) : spec;
+        } else {
+          let { from, to = from, insert: insert2 } = spec;
+          if (from > to || from < 0 || to > length)
+            throw new RangeError(`Invalid change range ${from} to ${to} (in doc of length ${length})`);
+          let insText = !insert2 ? Text.empty : typeof insert2 == "string" ? Text.of(insert2.split(lineSep || DefaultSplit)) : insert2;
+          let insLen = insText.length;
+          if (from == to && insLen == 0)
+            return;
+          if (from < pos)
+            flush();
+          if (from > pos)
+            addSection(sections, from - pos, -1);
+          addSection(sections, to - from, insLen);
+          addInsert(inserted, sections, insText);
+          pos = to;
+        }
+      }
+      process2(changes);
+      flush(!total);
+      return total;
+    }
+    /**
+    Create an empty changeset of the given length.
+    */
+    static empty(length) {
+      return new _ChangeSet(length ? [length, -1] : [], []);
+    }
+    /**
+    Create a changeset from its JSON representation (as produced by
+    [`toJSON`](https://codemirror.net/6/docs/ref/#state.ChangeSet.toJSON).
+    */
+    static fromJSON(json) {
+      if (!Array.isArray(json))
+        throw new RangeError("Invalid JSON representation of ChangeSet");
+      let sections = [], inserted = [];
+      for (let i = 0; i < json.length; i++) {
+        let part = json[i];
+        if (typeof part == "number") {
+          sections.push(part, -1);
+        } else if (!Array.isArray(part) || typeof part[0] != "number" || part.some((e, i2) => i2 && typeof e != "string")) {
+          throw new RangeError("Invalid JSON representation of ChangeSet");
+        } else if (part.length == 1) {
+          sections.push(part[0], 0);
+        } else {
+          while (inserted.length < i)
+            inserted.push(Text.empty);
+          inserted[i] = Text.of(part.slice(1));
+          sections.push(part[0], inserted[i].length);
+        }
+      }
+      return new _ChangeSet(sections, inserted);
+    }
+    /**
+    @internal
+    */
+    static createSet(sections, inserted) {
+      return new _ChangeSet(sections, inserted);
+    }
+  };
+  function addSection(sections, len, ins, forceJoin = false) {
+    if (len == 0 && ins <= 0)
+      return;
+    let last = sections.length - 2;
+    if (last >= 0 && ins <= 0 && ins == sections[last + 1])
+      sections[last] += len;
+    else if (last >= 0 && len == 0 && sections[last] == 0)
+      sections[last + 1] += ins;
+    else if (forceJoin) {
+      sections[last] += len;
+      sections[last + 1] += ins;
+    } else
+      sections.push(len, ins);
+  }
+  function addInsert(values, sections, value) {
+    if (value.length == 0)
+      return;
+    let index = sections.length - 2 >> 1;
+    if (index < values.length) {
+      values[values.length - 1] = values[values.length - 1].append(value);
+    } else {
+      while (values.length < index)
+        values.push(Text.empty);
+      values.push(value);
+    }
+  }
+  function iterChanges(desc, f, individual) {
+    let inserted = desc.inserted;
+    for (let posA = 0, posB = 0, i = 0; i < desc.sections.length; ) {
+      let len = desc.sections[i++], ins = desc.sections[i++];
+      if (ins < 0) {
+        posA += len;
+        posB += len;
+      } else {
+        let endA = posA, endB = posB, text = Text.empty;
+        for (; ; ) {
+          endA += len;
+          endB += ins;
+          if (ins && inserted)
+            text = text.append(inserted[i - 2 >> 1]);
+          if (individual || i == desc.sections.length || desc.sections[i + 1] < 0)
+            break;
+          len = desc.sections[i++];
+          ins = desc.sections[i++];
+        }
+        f(posA, endA, posB, endB, text);
+        posA = endA;
+        posB = endB;
+      }
+    }
+  }
+  function mapSet(setA, setB, before, mkSet = false) {
+    let sections = [], insert2 = mkSet ? [] : null;
+    let a = new SectionIter(setA), b = new SectionIter(setB);
+    for (let inserted = -1; ; ) {
+      if (a.done && b.len || b.done && a.len) {
+        throw new Error("Mismatched change set lengths");
+      } else if (a.ins == -1 && b.ins == -1) {
+        let len = Math.min(a.len, b.len);
+        addSection(sections, len, -1);
+        a.forward(len);
+        b.forward(len);
+      } else if (b.ins >= 0 && (a.ins < 0 || inserted == a.i || a.off == 0 && (b.len < a.len || b.len == a.len && !before))) {
+        let len = b.len;
+        addSection(sections, b.ins, -1);
+        while (len) {
+          let piece = Math.min(a.len, len);
+          if (a.ins >= 0 && inserted < a.i && a.len <= piece) {
+            addSection(sections, 0, a.ins);
+            if (insert2)
+              addInsert(insert2, sections, a.text);
+            inserted = a.i;
+          }
+          a.forward(piece);
+          len -= piece;
+        }
+        b.next();
+      } else if (a.ins >= 0) {
+        let len = 0, left = a.len;
+        while (left) {
+          if (b.ins == -1) {
+            let piece = Math.min(left, b.len);
+            len += piece;
+            left -= piece;
+            b.forward(piece);
+          } else if (b.ins == 0 && b.len < left) {
+            left -= b.len;
+            b.next();
+          } else {
+            break;
+          }
+        }
+        addSection(sections, len, inserted < a.i ? a.ins : 0);
+        if (insert2 && inserted < a.i)
+          addInsert(insert2, sections, a.text);
+        inserted = a.i;
+        a.forward(a.len - left);
+      } else if (a.done && b.done) {
+        return insert2 ? ChangeSet.createSet(sections, insert2) : ChangeDesc.create(sections);
+      } else {
+        throw new Error("Mismatched change set lengths");
+      }
+    }
+  }
+  function composeSets(setA, setB, mkSet = false) {
+    let sections = [];
+    let insert2 = mkSet ? [] : null;
+    let a = new SectionIter(setA), b = new SectionIter(setB);
+    for (let open = false; ; ) {
+      if (a.done && b.done) {
+        return insert2 ? ChangeSet.createSet(sections, insert2) : ChangeDesc.create(sections);
+      } else if (a.ins == 0) {
+        addSection(sections, a.len, 0, open);
+        a.next();
+      } else if (b.len == 0 && !b.done) {
+        addSection(sections, 0, b.ins, open);
+        if (insert2)
+          addInsert(insert2, sections, b.text);
+        b.next();
+      } else if (a.done || b.done) {
+        throw new Error("Mismatched change set lengths");
+      } else {
+        let len = Math.min(a.len2, b.len), sectionLen = sections.length;
+        if (a.ins == -1) {
+          let insB = b.ins == -1 ? -1 : b.off ? 0 : b.ins;
+          addSection(sections, len, insB, open);
+          if (insert2 && insB)
+            addInsert(insert2, sections, b.text);
+        } else if (b.ins == -1) {
+          addSection(sections, a.off ? 0 : a.len, len, open);
+          if (insert2)
+            addInsert(insert2, sections, a.textBit(len));
+        } else {
+          addSection(sections, a.off ? 0 : a.len, b.off ? 0 : b.ins, open);
+          if (insert2 && !b.off)
+            addInsert(insert2, sections, b.text);
+        }
+        open = (a.ins > len || b.ins >= 0 && b.len > len) && (open || sections.length > sectionLen);
+        a.forward2(len);
+        b.forward(len);
+      }
+    }
+  }
+  var SectionIter = class {
+    constructor(set) {
+      this.set = set;
+      this.i = 0;
+      this.next();
+    }
+    next() {
+      let { sections } = this.set;
+      if (this.i < sections.length) {
+        this.len = sections[this.i++];
+        this.ins = sections[this.i++];
+      } else {
+        this.len = 0;
+        this.ins = -2;
+      }
+      this.off = 0;
+    }
+    get done() {
+      return this.ins == -2;
+    }
+    get len2() {
+      return this.ins < 0 ? this.len : this.ins;
+    }
+    get text() {
+      let { inserted } = this.set, index = this.i - 2 >> 1;
+      return index >= inserted.length ? Text.empty : inserted[index];
+    }
+    textBit(len) {
+      let { inserted } = this.set, index = this.i - 2 >> 1;
+      return index >= inserted.length && !len ? Text.empty : inserted[index].slice(this.off, len == null ? void 0 : this.off + len);
+    }
+    forward(len) {
+      if (len == this.len)
+        this.next();
+      else {
+        this.len -= len;
+        this.off += len;
+      }
+    }
+    forward2(len) {
+      if (this.ins == -1)
+        this.forward(len);
+      else if (len == this.ins)
+        this.next();
+      else {
+        this.ins -= len;
+        this.off += len;
+      }
+    }
+  };
+  var SelectionRange = class _SelectionRange {
+    constructor(from, to, flags) {
+      this.from = from;
+      this.to = to;
+      this.flags = flags;
+    }
+    /**
+    The anchor of the range—the side that doesn't move when you
+    extend it.
+    */
+    get anchor() {
+      return this.flags & 32 ? this.to : this.from;
+    }
+    /**
+    The head of the range, which is moved when the range is
+    [extended](https://codemirror.net/6/docs/ref/#state.SelectionRange.extend).
+    */
+    get head() {
+      return this.flags & 32 ? this.from : this.to;
+    }
+    /**
+    True when `anchor` and `head` are at the same position.
+    */
+    get empty() {
+      return this.from == this.to;
+    }
+    /**
+    If this is a cursor that is explicitly associated with the
+    character on one of its sides, this returns the side. -1 means
+    the character before its position, 1 the character after, and 0
+    means no association.
+    */
+    get assoc() {
+      return this.flags & 8 ? -1 : this.flags & 16 ? 1 : 0;
+    }
+    /**
+    The bidirectional text level associated with this cursor, if
+    any.
+    */
+    get bidiLevel() {
+      let level = this.flags & 7;
+      return level == 7 ? null : level;
+    }
+    /**
+    The goal column (stored vertical offset) associated with a
+    cursor. This is used to preserve the vertical position when
+    [moving](https://codemirror.net/6/docs/ref/#view.EditorView.moveVertically) across
+    lines of different length.
+    */
+    get goalColumn() {
+      let value = this.flags >> 6;
+      return value == 16777215 ? void 0 : value;
+    }
+    /**
+    Map this range through a change, producing a valid range in the
+    updated document.
+    */
+    map(change, assoc = -1) {
+      let from, to;
+      if (this.empty) {
+        from = to = change.mapPos(this.from, assoc);
+      } else {
+        from = change.mapPos(this.from, 1);
+        to = change.mapPos(this.to, -1);
+      }
+      return from == this.from && to == this.to ? this : new _SelectionRange(from, to, this.flags);
+    }
+    /**
+    Extend this range to cover at least `from` to `to`.
+    */
+    extend(from, to = from, assoc = 0) {
+      if (from <= this.anchor && to >= this.anchor)
+        return EditorSelection.range(from, to, void 0, void 0, assoc);
+      let head = Math.abs(from - this.anchor) > Math.abs(to - this.anchor) ? from : to;
+      return EditorSelection.range(this.anchor, head, void 0, void 0, assoc);
+    }
+    /**
+    Compare this range to another range.
+    */
+    eq(other, includeAssoc = false) {
+      return this.anchor == other.anchor && this.head == other.head && this.goalColumn == other.goalColumn && (!includeAssoc || !this.empty || this.assoc == other.assoc);
+    }
+    /**
+    Return a JSON-serializable object representing the range.
+    */
+    toJSON() {
+      return { anchor: this.anchor, head: this.head };
+    }
+    /**
+    Convert a JSON representation of a range to a `SelectionRange`
+    instance.
+    */
+    static fromJSON(json) {
+      if (!json || typeof json.anchor != "number" || typeof json.head != "number")
+        throw new RangeError("Invalid JSON representation for SelectionRange");
+      return EditorSelection.range(json.anchor, json.head);
+    }
+    /**
+    @internal
+    */
+    static create(from, to, flags) {
+      return new _SelectionRange(from, to, flags);
+    }
+  };
+  var EditorSelection = class _EditorSelection {
+    constructor(ranges, mainIndex) {
+      this.ranges = ranges;
+      this.mainIndex = mainIndex;
+    }
+    /**
+    Map a selection through a change. Used to adjust the selection
+    position for changes.
+    */
+    map(change, assoc = -1) {
+      if (change.empty)
+        return this;
+      return _EditorSelection.create(this.ranges.map((r) => r.map(change, assoc)), this.mainIndex);
+    }
+    /**
+    Compare this selection to another selection. By default, ranges
+    are compared only by position. When `includeAssoc` is true,
+    cursor ranges must also have the same
+    [`assoc`](https://codemirror.net/6/docs/ref/#state.SelectionRange.assoc) value.
+    */
+    eq(other, includeAssoc = false) {
+      if (this.ranges.length != other.ranges.length || this.mainIndex != other.mainIndex)
+        return false;
+      for (let i = 0; i < this.ranges.length; i++)
+        if (!this.ranges[i].eq(other.ranges[i], includeAssoc))
+          return false;
+      return true;
+    }
+    /**
+    Get the primary selection range. Usually, you should make sure
+    your code applies to _all_ ranges, by using methods like
+    [`changeByRange`](https://codemirror.net/6/docs/ref/#state.EditorState.changeByRange).
+    */
+    get main() {
+      return this.ranges[this.mainIndex];
+    }
+    /**
+    Make sure the selection only has one range. Returns a selection
+    holding only the main range from this selection.
+    */
+    asSingle() {
+      return this.ranges.length == 1 ? this : new _EditorSelection([this.main], 0);
+    }
+    /**
+    Extend this selection with an extra range.
+    */
+    addRange(range, main = true) {
+      return _EditorSelection.create([range].concat(this.ranges), main ? 0 : this.mainIndex + 1);
+    }
+    /**
+    Replace a given range with another range, and then normalize the
+    selection to merge and sort ranges if necessary.
+    */
+    replaceRange(range, which = this.mainIndex) {
+      let ranges = this.ranges.slice();
+      ranges[which] = range;
+      return _EditorSelection.create(ranges, this.mainIndex);
+    }
+    /**
+    Convert this selection to an object that can be serialized to
+    JSON.
+    */
+    toJSON() {
+      return { ranges: this.ranges.map((r) => r.toJSON()), main: this.mainIndex };
+    }
+    /**
+    Create a selection from a JSON representation.
+    */
+    static fromJSON(json) {
+      if (!json || !Array.isArray(json.ranges) || typeof json.main != "number" || json.main >= json.ranges.length)
+        throw new RangeError("Invalid JSON representation for EditorSelection");
+      return new _EditorSelection(json.ranges.map((r) => SelectionRange.fromJSON(r)), json.main);
+    }
+    /**
+    Create a selection holding a single range.
+    */
+    static single(anchor, head = anchor) {
+      return new _EditorSelection([_EditorSelection.range(anchor, head)], 0);
+    }
+    /**
+    Sort and merge the given set of ranges, creating a valid
+    selection.
+    */
+    static create(ranges, mainIndex = 0) {
+      if (ranges.length == 0)
+        throw new RangeError("A selection needs at least one range");
+      for (let pos = 0, i = 0; i < ranges.length; i++) {
+        let range = ranges[i];
+        if (range.empty ? range.from <= pos : range.from < pos)
+          return _EditorSelection.normalized(ranges.slice(), mainIndex);
+        pos = range.to;
+      }
+      return new _EditorSelection(ranges, mainIndex);
+    }
+    /**
+    Create a cursor selection range at the given position. You can
+    safely ignore the optional arguments in most situations.
+    */
+    static cursor(pos, assoc = 0, bidiLevel, goalColumn) {
+      return SelectionRange.create(pos, pos, (assoc == 0 ? 0 : assoc < 0 ? 8 : 16) | (bidiLevel == null ? 7 : Math.min(6, bidiLevel)) | (goalColumn !== null && goalColumn !== void 0 ? goalColumn : 16777215) << 6);
+    }
+    /**
+    Create a selection range.
+    */
+    static range(anchor, head, goalColumn, bidiLevel, assoc) {
+      let flags = (goalColumn !== null && goalColumn !== void 0 ? goalColumn : 16777215) << 6 | (bidiLevel == null ? 7 : Math.min(6, bidiLevel));
+      if (!assoc && anchor != head)
+        assoc = head < anchor ? 1 : -1;
+      return head < anchor ? SelectionRange.create(head, anchor, 32 | 16 | flags) : SelectionRange.create(anchor, head, (!assoc ? 0 : assoc < 0 ? 8 : 16) | flags);
+    }
+    /**
+    @internal
+    */
+    static normalized(ranges, mainIndex = 0) {
+      let main = ranges[mainIndex];
+      ranges.sort((a, b) => a.from - b.from);
+      mainIndex = ranges.indexOf(main);
+      for (let i = 1; i < ranges.length; i++) {
+        let range = ranges[i], prev = ranges[i - 1];
+        if (range.empty ? range.from <= prev.to : range.from < prev.to) {
+          let from = prev.from, to = Math.max(range.to, prev.to);
+          if (i <= mainIndex)
+            mainIndex--;
+          ranges.splice(--i, 2, range.anchor > range.head ? _EditorSelection.range(to, from) : _EditorSelection.range(from, to));
+        }
+      }
+      return new _EditorSelection(ranges, mainIndex);
+    }
+  };
+  function checkSelection(selection, docLength) {
+    for (let range of selection.ranges)
+      if (range.to > docLength)
+        throw new RangeError("Selection points outside of document");
+  }
+  var nextID = 0;
+  var Facet = class _Facet {
+    constructor(combine, compareInput, compare2, isStatic, enables) {
+      this.combine = combine;
+      this.compareInput = compareInput;
+      this.compare = compare2;
+      this.isStatic = isStatic;
+      this.id = nextID++;
+      this.default = combine([]);
+      this.extensions = typeof enables == "function" ? enables(this) : enables;
+    }
+    /**
+    Returns a facet reader for this facet, which can be used to
+    [read](https://codemirror.net/6/docs/ref/#state.EditorState.facet) it but not to define values for it.
+    */
+    get reader() {
+      return this;
+    }
+    /**
+    Define a new facet.
+    */
+    static define(config2 = {}) {
+      return new _Facet(config2.combine || ((a) => a), config2.compareInput || ((a, b) => a === b), config2.compare || (!config2.combine ? sameArray : (a, b) => a === b), !!config2.static, config2.enables);
+    }
+    /**
+    Returns an extension that adds the given value to this facet.
+    */
+    of(value) {
+      return new FacetProvider([], this, 0, value);
+    }
+    /**
+    Create an extension that computes a value for the facet from a
+    state. You must take care to declare the parts of the state that
+    this value depends on, since your function is only called again
+    for a new state when one of those parts changed.
+    
+    In cases where your value depends only on a single field, you'll
+    want to use the [`from`](https://codemirror.net/6/docs/ref/#state.Facet.from) method instead.
+    */
+    compute(deps, get) {
+      if (this.isStatic)
+        throw new Error("Can't compute a static facet");
+      return new FacetProvider(deps, this, 1, get);
+    }
+    /**
+    Create an extension that computes zero or more values for this
+    facet from a state.
+    */
+    computeN(deps, get) {
+      if (this.isStatic)
+        throw new Error("Can't compute a static facet");
+      return new FacetProvider(deps, this, 2, get);
+    }
+    from(field, get) {
+      if (!get)
+        get = (x) => x;
+      return this.compute([field], (state) => get(state.field(field)));
+    }
+  };
+  function sameArray(a, b) {
+    return a == b || a.length == b.length && a.every((e, i) => e === b[i]);
+  }
+  var FacetProvider = class {
+    constructor(dependencies, facet, type, value) {
+      this.dependencies = dependencies;
+      this.facet = facet;
+      this.type = type;
+      this.value = value;
+      this.id = nextID++;
+    }
+    dynamicSlot(addresses) {
+      var _a2;
+      let getter = this.value;
+      let compare2 = this.facet.compareInput;
+      let id = this.id, idx = addresses[id] >> 1, multi = this.type == 2;
+      let depDoc = false, depSel = false, depAddrs = [];
+      for (let dep of this.dependencies) {
+        if (dep == "doc")
+          depDoc = true;
+        else if (dep == "selection")
+          depSel = true;
+        else if ((((_a2 = addresses[dep.id]) !== null && _a2 !== void 0 ? _a2 : 1) & 1) == 0)
+          depAddrs.push(addresses[dep.id]);
+      }
+      return {
+        create(state) {
+          state.values[idx] = getter(state);
+          return 1;
+        },
+        update(state, tr) {
+          if (depDoc && tr.docChanged || depSel && (tr.docChanged || tr.selection) || ensureAll(state, depAddrs)) {
+            let newVal = getter(state);
+            if (multi ? !compareArray(newVal, state.values[idx], compare2) : !compare2(newVal, state.values[idx])) {
+              state.values[idx] = newVal;
+              return 1;
+            }
+          }
+          return 0;
+        },
+        reconfigure: (state, oldState) => {
+          let newVal, oldAddr = oldState.config.address[id];
+          if (oldAddr != null) {
+            let oldVal = getAddr(oldState, oldAddr);
+            if (this.dependencies.every((dep) => {
+              return dep instanceof Facet ? oldState.facet(dep) === state.facet(dep) : dep instanceof StateField ? oldState.field(dep, false) == state.field(dep, false) : true;
+            }) || (multi ? compareArray(newVal = getter(state), oldVal, compare2) : compare2(newVal = getter(state), oldVal))) {
+              state.values[idx] = oldVal;
+              return 0;
+            }
+          } else {
+            newVal = getter(state);
+          }
+          state.values[idx] = newVal;
+          return 1;
+        }
+      };
+    }
+  };
+  function compareArray(a, b, compare2) {
+    if (a.length != b.length)
+      return false;
+    for (let i = 0; i < a.length; i++)
+      if (!compare2(a[i], b[i]))
+        return false;
+    return true;
+  }
+  function ensureAll(state, addrs) {
+    let changed = false;
+    for (let addr of addrs)
+      if (ensureAddr(state, addr) & 1)
+        changed = true;
+    return changed;
+  }
+  function dynamicFacetSlot(addresses, facet, providers) {
+    let providerAddrs = providers.map((p) => addresses[p.id]);
+    let providerTypes = providers.map((p) => p.type);
+    let dynamic = providerAddrs.filter((p) => !(p & 1));
+    let idx = addresses[facet.id] >> 1;
+    function get(state) {
+      let values = [];
+      for (let i = 0; i < providerAddrs.length; i++) {
+        let value = getAddr(state, providerAddrs[i]);
+        if (providerTypes[i] == 2)
+          for (let val of value)
+            values.push(val);
+        else
+          values.push(value);
+      }
+      return facet.combine(values);
+    }
+    return {
+      create(state) {
+        for (let addr of providerAddrs)
+          ensureAddr(state, addr);
+        state.values[idx] = get(state);
+        return 1;
+      },
+      update(state, tr) {
+        if (!ensureAll(state, dynamic))
+          return 0;
+        let value = get(state);
+        if (facet.compare(value, state.values[idx]))
+          return 0;
+        state.values[idx] = value;
+        return 1;
+      },
+      reconfigure(state, oldState) {
+        let depChanged = ensureAll(state, providerAddrs);
+        let oldProviders = oldState.config.facets[facet.id], oldValue = oldState.facet(facet);
+        if (oldProviders && !depChanged && sameArray(providers, oldProviders)) {
+          state.values[idx] = oldValue;
+          return 0;
+        }
+        let value = get(state);
+        if (facet.compare(value, oldValue)) {
+          state.values[idx] = oldValue;
+          return 0;
+        }
+        state.values[idx] = value;
+        return 1;
+      }
+    };
+  }
+  var initField = /* @__PURE__ */ Facet.define({ static: true });
+  var StateField = class _StateField {
+    constructor(id, createF, updateF, compareF, spec) {
+      this.id = id;
+      this.createF = createF;
+      this.updateF = updateF;
+      this.compareF = compareF;
+      this.spec = spec;
+      this.provides = void 0;
+    }
+    /**
+    Define a state field.
+    */
+    static define(config2) {
+      let field = new _StateField(nextID++, config2.create, config2.update, config2.compare || ((a, b) => a === b), config2);
+      if (config2.provide)
+        field.provides = config2.provide(field);
+      return field;
+    }
+    create(state) {
+      let init = state.facet(initField).find((i) => i.field == this);
+      return ((init === null || init === void 0 ? void 0 : init.create) || this.createF)(state);
+    }
+    /**
+    @internal
+    */
+    slot(addresses) {
+      let idx = addresses[this.id] >> 1;
+      return {
+        create: (state) => {
+          state.values[idx] = this.create(state);
+          return 1;
+        },
+        update: (state, tr) => {
+          let oldVal = state.values[idx];
+          let value = this.updateF(oldVal, tr);
+          if (this.compareF(oldVal, value))
+            return 0;
+          state.values[idx] = value;
+          return 1;
+        },
+        reconfigure: (state, oldState) => {
+          let init = state.facet(initField), oldInit = oldState.facet(initField), reInit;
+          if ((reInit = init.find((i) => i.field == this)) && reInit != oldInit.find((i) => i.field == this)) {
+            state.values[idx] = reInit.create(state);
+            return 1;
+          }
+          if (oldState.config.address[this.id] != null) {
+            state.values[idx] = oldState.field(this);
+            return 0;
+          }
+          state.values[idx] = this.create(state);
+          return 1;
+        }
+      };
+    }
+    /**
+    Returns an extension that enables this field and overrides the
+    way it is initialized. Can be useful when you need to provide a
+    non-default starting value for the field.
+    */
+    init(create) {
+      return [this, initField.of({ field: this, create })];
+    }
+    /**
+    State field instances can be used as
+    [`Extension`](https://codemirror.net/6/docs/ref/#state.Extension) values to enable the field in a
+    given state.
+    */
+    get extension() {
+      return this;
+    }
+  };
+  var Prec_ = { lowest: 4, low: 3, default: 2, high: 1, highest: 0 };
+  function prec(value) {
+    return (ext) => new PrecExtension(ext, value);
+  }
+  var Prec = {
+    /**
+    The highest precedence level, for extensions that should end up
+    near the start of the precedence ordering.
+    */
+    highest: /* @__PURE__ */ prec(Prec_.highest),
+    /**
+    A higher-than-default precedence, for extensions that should
+    come before those with default precedence.
+    */
+    high: /* @__PURE__ */ prec(Prec_.high),
+    /**
+    The default precedence, which is also used for extensions
+    without an explicit precedence.
+    */
+    default: /* @__PURE__ */ prec(Prec_.default),
+    /**
+    A lower-than-default precedence.
+    */
+    low: /* @__PURE__ */ prec(Prec_.low),
+    /**
+    The lowest precedence level. Meant for things that should end up
+    near the end of the extension order.
+    */
+    lowest: /* @__PURE__ */ prec(Prec_.lowest)
+  };
+  var PrecExtension = class {
+    constructor(inner, prec2) {
+      this.inner = inner;
+      this.prec = prec2;
+    }
+  };
+  var Compartment = class _Compartment {
+    /**
+    Create an instance of this compartment to add to your [state
+    configuration](https://codemirror.net/6/docs/ref/#state.EditorStateConfig.extensions).
+    */
+    of(ext) {
+      return new CompartmentInstance(this, ext);
+    }
+    /**
+    Create an [effect](https://codemirror.net/6/docs/ref/#state.TransactionSpec.effects) that
+    reconfigures this compartment.
+    */
+    reconfigure(content2) {
+      return _Compartment.reconfigure.of({ compartment: this, extension: content2 });
+    }
+    /**
+    Get the current content of the compartment in the state, or
+    `undefined` if it isn't present.
+    */
+    get(state) {
+      return state.config.compartments.get(this);
+    }
+  };
+  var CompartmentInstance = class {
+    constructor(compartment, inner) {
+      this.compartment = compartment;
+      this.inner = inner;
+    }
+  };
+  var Configuration = class _Configuration {
+    constructor(base2, compartments, dynamicSlots, address, staticValues, facets) {
+      this.base = base2;
+      this.compartments = compartments;
+      this.dynamicSlots = dynamicSlots;
+      this.address = address;
+      this.staticValues = staticValues;
+      this.facets = facets;
+      this.statusTemplate = [];
+      while (this.statusTemplate.length < dynamicSlots.length)
+        this.statusTemplate.push(
+          0
+          /* SlotStatus.Unresolved */
+        );
+    }
+    staticFacet(facet) {
+      let addr = this.address[facet.id];
+      return addr == null ? facet.default : this.staticValues[addr >> 1];
+    }
+    static resolve(base2, compartments, oldState) {
+      let fields = [];
+      let facets = /* @__PURE__ */ Object.create(null);
+      let newCompartments = /* @__PURE__ */ new Map();
+      for (let ext of flatten(base2, compartments, newCompartments)) {
+        if (ext instanceof StateField)
+          fields.push(ext);
+        else
+          (facets[ext.facet.id] || (facets[ext.facet.id] = [])).push(ext);
+      }
+      let address = /* @__PURE__ */ Object.create(null);
+      let staticValues = [];
+      let dynamicSlots = [];
+      for (let field of fields) {
+        address[field.id] = dynamicSlots.length << 1;
+        dynamicSlots.push((a) => field.slot(a));
+      }
+      let oldFacets = oldState === null || oldState === void 0 ? void 0 : oldState.config.facets;
+      for (let id in facets) {
+        let providers = facets[id], facet = providers[0].facet;
+        let oldProviders = oldFacets && oldFacets[id] || [];
+        if (providers.every(
+          (p) => p.type == 0
+          /* Provider.Static */
+        )) {
+          address[facet.id] = staticValues.length << 1 | 1;
+          if (sameArray(oldProviders, providers)) {
+            staticValues.push(oldState.facet(facet));
+          } else {
+            let value = facet.combine(providers.map((p) => p.value));
+            staticValues.push(oldState && facet.compare(value, oldState.facet(facet)) ? oldState.facet(facet) : value);
+          }
+        } else {
+          for (let p of providers) {
+            if (p.type == 0) {
+              address[p.id] = staticValues.length << 1 | 1;
+              staticValues.push(p.value);
+            } else {
+              address[p.id] = dynamicSlots.length << 1;
+              dynamicSlots.push((a) => p.dynamicSlot(a));
+            }
+          }
+          address[facet.id] = dynamicSlots.length << 1;
+          dynamicSlots.push((a) => dynamicFacetSlot(a, facet, providers));
+        }
+      }
+      let dynamic = dynamicSlots.map((f) => f(address));
+      return new _Configuration(base2, newCompartments, dynamic, address, staticValues, facets);
+    }
+  };
+  function flatten(extension, compartments, newCompartments) {
+    let result = [[], [], [], [], []];
+    let seen = /* @__PURE__ */ new Map();
+    function inner(ext, prec2) {
+      let known = seen.get(ext);
+      if (known != null) {
+        if (known <= prec2)
+          return;
+        let found = result[known].indexOf(ext);
+        if (found > -1)
+          result[known].splice(found, 1);
+        if (ext instanceof CompartmentInstance)
+          newCompartments.delete(ext.compartment);
+      }
+      seen.set(ext, prec2);
+      if (Array.isArray(ext)) {
+        for (let e of ext)
+          inner(e, prec2);
+      } else if (ext instanceof CompartmentInstance) {
+        if (newCompartments.has(ext.compartment))
+          throw new RangeError(`Duplicate use of compartment in extensions`);
+        let content2 = compartments.get(ext.compartment) || ext.inner;
+        newCompartments.set(ext.compartment, content2);
+        inner(content2, prec2);
+      } else if (ext instanceof PrecExtension) {
+        inner(ext.inner, ext.prec);
+      } else if (ext instanceof StateField) {
+        result[prec2].push(ext);
+        if (ext.provides)
+          inner(ext.provides, prec2);
+      } else if (ext instanceof FacetProvider) {
+        result[prec2].push(ext);
+        if (ext.facet.extensions)
+          inner(ext.facet.extensions, Prec_.default);
+      } else {
+        let content2 = ext.extension;
+        if (!content2)
+          throw new Error(`Unrecognized extension value in extension set (${ext}). This sometimes happens because multiple instances of @codemirror/state are loaded, breaking instanceof checks.`);
+        inner(content2, prec2);
+      }
+    }
+    inner(extension, Prec_.default);
+    return result.reduce((a, b) => a.concat(b));
+  }
+  function ensureAddr(state, addr) {
+    if (addr & 1)
+      return 2;
+    let idx = addr >> 1;
+    let status = state.status[idx];
+    if (status == 4)
+      throw new Error("Cyclic dependency between fields and/or facets");
+    if (status & 2)
+      return status;
+    state.status[idx] = 4;
+    let changed = state.computeSlot(state, state.config.dynamicSlots[idx]);
+    return state.status[idx] = 2 | changed;
+  }
+  function getAddr(state, addr) {
+    return addr & 1 ? state.config.staticValues[addr >> 1] : state.values[addr >> 1];
+  }
+  var languageData = /* @__PURE__ */ Facet.define();
+  var allowMultipleSelections = /* @__PURE__ */ Facet.define({
+    combine: (values) => values.some((v) => v),
+    static: true
+  });
+  var lineSeparator = /* @__PURE__ */ Facet.define({
+    combine: (values) => values.length ? values[0] : void 0,
+    static: true
+  });
+  var changeFilter = /* @__PURE__ */ Facet.define();
+  var transactionFilter = /* @__PURE__ */ Facet.define();
+  var transactionExtender = /* @__PURE__ */ Facet.define();
+  var readOnly = /* @__PURE__ */ Facet.define({
+    combine: (values) => values.length ? values[0] : false
+  });
+  var Annotation = class {
+    /**
+    @internal
+    */
+    constructor(type, value) {
+      this.type = type;
+      this.value = value;
+    }
+    /**
+    Define a new type of annotation.
+    */
+    static define() {
+      return new AnnotationType();
+    }
+  };
+  var AnnotationType = class {
+    /**
+    Create an instance of this annotation.
+    */
+    of(value) {
+      return new Annotation(this, value);
+    }
+  };
+  var StateEffectType = class {
+    /**
+    @internal
+    */
+    constructor(map) {
+      this.map = map;
+    }
+    /**
+    Create a [state effect](https://codemirror.net/6/docs/ref/#state.StateEffect) instance of this
+    type.
+    */
+    of(value) {
+      return new StateEffect(this, value);
+    }
+  };
+  var StateEffect = class _StateEffect {
+    /**
+    @internal
+    */
+    constructor(type, value) {
+      this.type = type;
+      this.value = value;
+    }
+    /**
+    Map this effect through a position mapping. Will return
+    `undefined` when that ends up deleting the effect.
+    */
+    map(mapping) {
+      let mapped = this.type.map(this.value, mapping);
+      return mapped === void 0 ? void 0 : mapped == this.value ? this : new _StateEffect(this.type, mapped);
+    }
+    /**
+    Tells you whether this effect object is of a given
+    [type](https://codemirror.net/6/docs/ref/#state.StateEffectType).
+    */
+    is(type) {
+      return this.type == type;
+    }
+    /**
+    Define a new effect type. The type parameter indicates the type
+    of values that his effect holds. It should be a type that
+    doesn't include `undefined`, since that is used in
+    [mapping](https://codemirror.net/6/docs/ref/#state.StateEffect.map) to indicate that an effect is
+    removed.
+    */
+    static define(spec = {}) {
+      return new StateEffectType(spec.map || ((v) => v));
+    }
+    /**
+    Map an array of effects through a change set.
+    */
+    static mapEffects(effects, mapping) {
+      if (!effects.length)
+        return effects;
+      let result = [];
+      for (let effect of effects) {
+        let mapped = effect.map(mapping);
+        if (mapped)
+          result.push(mapped);
+      }
+      return result;
+    }
+  };
+  StateEffect.reconfigure = /* @__PURE__ */ StateEffect.define();
+  StateEffect.appendConfig = /* @__PURE__ */ StateEffect.define();
+  var Transaction = class _Transaction {
+    constructor(startState, changes, selection, effects, annotations, scrollIntoView3) {
+      this.startState = startState;
+      this.changes = changes;
+      this.selection = selection;
+      this.effects = effects;
+      this.annotations = annotations;
+      this.scrollIntoView = scrollIntoView3;
+      this._doc = null;
+      this._state = null;
+      if (selection)
+        checkSelection(selection, changes.newLength);
+      if (!annotations.some((a) => a.type == _Transaction.time))
+        this.annotations = annotations.concat(_Transaction.time.of(Date.now()));
+    }
+    /**
+    @internal
+    */
+    static create(startState, changes, selection, effects, annotations, scrollIntoView3) {
+      return new _Transaction(startState, changes, selection, effects, annotations, scrollIntoView3);
+    }
+    /**
+    The new document produced by the transaction. Contrary to
+    [`.state`](https://codemirror.net/6/docs/ref/#state.Transaction.state)`.doc`, accessing this won't
+    force the entire new state to be computed right away, so it is
+    recommended that [transaction
+    filters](https://codemirror.net/6/docs/ref/#state.EditorState^transactionFilter) use this getter
+    when they need to look at the new document.
+    */
+    get newDoc() {
+      return this._doc || (this._doc = this.changes.apply(this.startState.doc));
+    }
+    /**
+    The new selection produced by the transaction. If
+    [`this.selection`](https://codemirror.net/6/docs/ref/#state.Transaction.selection) is undefined,
+    this will [map](https://codemirror.net/6/docs/ref/#state.EditorSelection.map) the start state's
+    current selection through the changes made by the transaction.
+    */
+    get newSelection() {
+      return this.selection || this.startState.selection.map(this.changes);
+    }
+    /**
+    The new state created by the transaction. Computed on demand
+    (but retained for subsequent access), so it is recommended not to
+    access it in [transaction
+    filters](https://codemirror.net/6/docs/ref/#state.EditorState^transactionFilter) when possible.
+    */
+    get state() {
+      if (!this._state)
+        this.startState.applyTransaction(this);
+      return this._state;
+    }
+    /**
+    Get the value of the given annotation type, if any.
+    */
+    annotation(type) {
+      for (let ann of this.annotations)
+        if (ann.type == type)
+          return ann.value;
+      return void 0;
+    }
+    /**
+    Indicates whether the transaction changed the document.
+    */
+    get docChanged() {
+      return !this.changes.empty;
+    }
+    /**
+    Indicates whether this transaction reconfigures the state
+    (through a [configuration compartment](https://codemirror.net/6/docs/ref/#state.Compartment) or
+    with a top-level configuration
+    [effect](https://codemirror.net/6/docs/ref/#state.StateEffect^reconfigure).
+    */
+    get reconfigured() {
+      return this.startState.config != this.state.config;
+    }
+    /**
+    Returns true if the transaction has a [user
+    event](https://codemirror.net/6/docs/ref/#state.Transaction^userEvent) annotation that is equal to
+    or more specific than `event`. For example, if the transaction
+    has `"select.pointer"` as user event, `"select"` and
+    `"select.pointer"` will match it.
+    */
+    isUserEvent(event) {
+      let e = this.annotation(_Transaction.userEvent);
+      return !!(e && (e == event || e.length > event.length && e.slice(0, event.length) == event && e[event.length] == "."));
+    }
+  };
+  Transaction.time = /* @__PURE__ */ Annotation.define();
+  Transaction.userEvent = /* @__PURE__ */ Annotation.define();
+  Transaction.addToHistory = /* @__PURE__ */ Annotation.define();
+  Transaction.remote = /* @__PURE__ */ Annotation.define();
+  function joinRanges(a, b) {
+    let result = [];
+    for (let iA = 0, iB = 0; ; ) {
+      let from, to;
+      if (iA < a.length && (iB == b.length || b[iB] >= a[iA])) {
+        from = a[iA++];
+        to = a[iA++];
+      } else if (iB < b.length) {
+        from = b[iB++];
+        to = b[iB++];
+      } else
+        return result;
+      if (!result.length || result[result.length - 1] < from)
+        result.push(from, to);
+      else if (result[result.length - 1] < to)
+        result[result.length - 1] = to;
+    }
+  }
+  function mergeTransaction(a, b, sequential) {
+    var _a2;
+    let mapForA, mapForB, changes;
+    if (sequential) {
+      mapForA = b.changes;
+      mapForB = ChangeSet.empty(b.changes.length);
+      changes = a.changes.compose(b.changes);
+    } else {
+      mapForA = b.changes.map(a.changes);
+      mapForB = a.changes.mapDesc(b.changes, true);
+      changes = a.changes.compose(mapForA);
+    }
+    return {
+      changes,
+      selection: b.selection ? b.selection.map(mapForB) : (_a2 = a.selection) === null || _a2 === void 0 ? void 0 : _a2.map(mapForA),
+      effects: StateEffect.mapEffects(a.effects, mapForA).concat(StateEffect.mapEffects(b.effects, mapForB)),
+      annotations: a.annotations.length ? a.annotations.concat(b.annotations) : b.annotations,
+      scrollIntoView: a.scrollIntoView || b.scrollIntoView
+    };
+  }
+  function resolveTransactionInner(state, spec, docSize) {
+    let sel = spec.selection, annotations = asArray(spec.annotations);
+    if (spec.userEvent)
+      annotations = annotations.concat(Transaction.userEvent.of(spec.userEvent));
+    return {
+      changes: spec.changes instanceof ChangeSet ? spec.changes : ChangeSet.of(spec.changes || [], docSize, state.facet(lineSeparator)),
+      selection: sel && (sel instanceof EditorSelection ? sel : EditorSelection.single(sel.anchor, sel.head)),
+      effects: asArray(spec.effects),
+      annotations,
+      scrollIntoView: !!spec.scrollIntoView
+    };
+  }
+  function resolveTransaction(state, specs, filter) {
+    let s = resolveTransactionInner(state, specs.length ? specs[0] : {}, state.doc.length);
+    if (specs.length && specs[0].filter === false)
+      filter = false;
+    for (let i = 1; i < specs.length; i++) {
+      if (specs[i].filter === false)
+        filter = false;
+      let seq = !!specs[i].sequential;
+      s = mergeTransaction(s, resolveTransactionInner(state, specs[i], seq ? s.changes.newLength : state.doc.length), seq);
+    }
+    let tr = Transaction.create(state, s.changes, s.selection, s.effects, s.annotations, s.scrollIntoView);
+    return extendTransaction(filter ? filterTransaction(tr) : tr);
+  }
+  function filterTransaction(tr) {
+    let state = tr.startState;
+    let result = true;
+    for (let filter of state.facet(changeFilter)) {
+      let value = filter(tr);
+      if (value === false) {
+        result = false;
+        break;
+      }
+      if (Array.isArray(value))
+        result = result === true ? value : joinRanges(result, value);
+    }
+    if (result !== true) {
+      let changes, back;
+      if (result === false) {
+        back = tr.changes.invertedDesc;
+        changes = ChangeSet.empty(state.doc.length);
+      } else {
+        let filtered = tr.changes.filter(result);
+        changes = filtered.changes;
+        back = filtered.filtered.mapDesc(filtered.changes).invertedDesc;
+      }
+      tr = Transaction.create(state, changes, tr.selection && tr.selection.map(back), StateEffect.mapEffects(tr.effects, back), tr.annotations, tr.scrollIntoView);
+    }
+    let filters = state.facet(transactionFilter);
+    for (let i = filters.length - 1; i >= 0; i--) {
+      let filtered = filters[i](tr);
+      if (filtered instanceof Transaction)
+        tr = filtered;
+      else if (Array.isArray(filtered) && filtered.length == 1 && filtered[0] instanceof Transaction)
+        tr = filtered[0];
+      else
+        tr = resolveTransaction(state, asArray(filtered), false);
+    }
+    return tr;
+  }
+  function extendTransaction(tr) {
+    let state = tr.startState, extenders = state.facet(transactionExtender), spec = tr;
+    for (let i = extenders.length - 1; i >= 0; i--) {
+      let extension = extenders[i](tr);
+      if (extension && Object.keys(extension).length)
+        spec = mergeTransaction(spec, resolveTransactionInner(state, extension, tr.changes.newLength), true);
+    }
+    return spec == tr ? tr : Transaction.create(state, tr.changes, tr.selection, spec.effects, spec.annotations, spec.scrollIntoView);
+  }
+  var none = [];
+  function asArray(value) {
+    return value == null ? none : Array.isArray(value) ? value : [value];
+  }
+  var CharCategory = /* @__PURE__ */ (function(CharCategory2) {
+    CharCategory2[CharCategory2["Word"] = 0] = "Word";
+    CharCategory2[CharCategory2["Space"] = 1] = "Space";
+    CharCategory2[CharCategory2["Other"] = 2] = "Other";
+    return CharCategory2;
+  })(CharCategory || (CharCategory = {}));
+  var nonASCIISingleCaseWordChar = /[\u00df\u0587\u0590-\u05f4\u0600-\u06ff\u3040-\u309f\u30a0-\u30ff\u3400-\u4db5\u4e00-\u9fcc\uac00-\ud7af]/;
+  var wordChar;
+  try {
+    wordChar = /* @__PURE__ */ new RegExp("[\\p{Alphabetic}\\p{Number}_]", "u");
+  } catch (_) {
+  }
+  function hasWordChar(str) {
+    if (wordChar)
+      return wordChar.test(str);
+    for (let i = 0; i < str.length; i++) {
+      let ch = str[i];
+      if (/\w/.test(ch) || ch > "\x80" && (ch.toUpperCase() != ch.toLowerCase() || nonASCIISingleCaseWordChar.test(ch)))
+        return true;
+    }
+    return false;
+  }
+  function makeCategorizer(wordChars) {
+    return (char) => {
+      if (!/\S/.test(char))
+        return CharCategory.Space;
+      if (hasWordChar(char))
+        return CharCategory.Word;
+      for (let i = 0; i < wordChars.length; i++)
+        if (char.indexOf(wordChars[i]) > -1)
+          return CharCategory.Word;
+      return CharCategory.Other;
+    };
+  }
+  var EditorState = class _EditorState {
+    constructor(config2, doc2, selection, values, computeSlot, tr) {
+      this.config = config2;
+      this.doc = doc2;
+      this.selection = selection;
+      this.values = values;
+      this.status = config2.statusTemplate.slice();
+      this.computeSlot = computeSlot;
+      if (tr)
+        tr._state = this;
+      for (let i = 0; i < this.config.dynamicSlots.length; i++)
+        ensureAddr(this, i << 1);
+      this.computeSlot = null;
+    }
+    field(field, require2 = true) {
+      let addr = this.config.address[field.id];
+      if (addr == null) {
+        if (require2)
+          throw new RangeError("Field is not present in this state");
+        return void 0;
+      }
+      ensureAddr(this, addr);
+      return getAddr(this, addr);
+    }
+    /**
+    Create a [transaction](https://codemirror.net/6/docs/ref/#state.Transaction) that updates this
+    state. Any number of [transaction specs](https://codemirror.net/6/docs/ref/#state.TransactionSpec)
+    can be passed. Unless
+    [`sequential`](https://codemirror.net/6/docs/ref/#state.TransactionSpec.sequential) is set, the
+    [changes](https://codemirror.net/6/docs/ref/#state.TransactionSpec.changes) (if any) of each spec
+    are assumed to start in the _current_ document (not the document
+    produced by previous specs), and its
+    [selection](https://codemirror.net/6/docs/ref/#state.TransactionSpec.selection) and
+    [effects](https://codemirror.net/6/docs/ref/#state.TransactionSpec.effects) are assumed to refer
+    to the document created by its _own_ changes. The resulting
+    transaction contains the combined effect of all the different
+    specs. For [selection](https://codemirror.net/6/docs/ref/#state.TransactionSpec.selection), later
+    specs take precedence over earlier ones.
+    */
+    update(...specs) {
+      return resolveTransaction(this, specs, true);
+    }
+    /**
+    @internal
+    */
+    applyTransaction(tr) {
+      let conf = this.config, { base: base2, compartments } = conf;
+      for (let effect of tr.effects) {
+        if (effect.is(Compartment.reconfigure)) {
+          if (conf) {
+            compartments = /* @__PURE__ */ new Map();
+            conf.compartments.forEach((val, key) => compartments.set(key, val));
+            conf = null;
+          }
+          compartments.set(effect.value.compartment, effect.value.extension);
+        } else if (effect.is(StateEffect.reconfigure)) {
+          conf = null;
+          base2 = effect.value;
+        } else if (effect.is(StateEffect.appendConfig)) {
+          conf = null;
+          base2 = asArray(base2).concat(effect.value);
+        }
+      }
+      let startValues;
+      if (!conf) {
+        conf = Configuration.resolve(base2, compartments, this);
+        let intermediateState = new _EditorState(conf, this.doc, this.selection, conf.dynamicSlots.map(() => null), (state, slot) => slot.reconfigure(state, this), null);
+        startValues = intermediateState.values;
+      } else {
+        startValues = tr.startState.values.slice();
+      }
+      let selection = tr.startState.facet(allowMultipleSelections) ? tr.newSelection : tr.newSelection.asSingle();
+      new _EditorState(conf, tr.newDoc, selection, startValues, (state, slot) => slot.update(state, tr), tr);
+    }
+    /**
+    Create a [transaction spec](https://codemirror.net/6/docs/ref/#state.TransactionSpec) that
+    replaces every selection range with the given content.
+    */
+    replaceSelection(text) {
+      if (typeof text == "string")
+        text = this.toText(text);
+      return this.changeByRange((range) => ({
+        changes: { from: range.from, to: range.to, insert: text },
+        range: EditorSelection.cursor(range.from + text.length)
+      }));
+    }
+    /**
+    Create a set of changes and a new selection by running the given
+    function for each range in the active selection. The function
+    can return an optional set of changes (in the coordinate space
+    of the start document), plus an updated range (in the coordinate
+    space of the document produced by the call's own changes). This
+    method will merge all the changes and ranges into a single
+    changeset and selection, and return it as a [transaction
+    spec](https://codemirror.net/6/docs/ref/#state.TransactionSpec), which can be passed to
+    [`update`](https://codemirror.net/6/docs/ref/#state.EditorState.update).
+    */
+    changeByRange(f) {
+      let sel = this.selection;
+      let result1 = f(sel.ranges[0]);
+      let changes = this.changes(result1.changes), ranges = [result1.range];
+      let effects = asArray(result1.effects);
+      for (let i = 1; i < sel.ranges.length; i++) {
+        let result = f(sel.ranges[i]);
+        let newChanges = this.changes(result.changes), newMapped = newChanges.map(changes);
+        for (let j = 0; j < i; j++)
+          ranges[j] = ranges[j].map(newMapped);
+        let mapBy = changes.mapDesc(newChanges, true);
+        ranges.push(result.range.map(mapBy));
+        changes = changes.compose(newMapped);
+        effects = StateEffect.mapEffects(effects, newMapped).concat(StateEffect.mapEffects(asArray(result.effects), mapBy));
+      }
+      return {
+        changes,
+        selection: EditorSelection.create(ranges, sel.mainIndex),
+        effects
+      };
+    }
+    /**
+    Create a [change set](https://codemirror.net/6/docs/ref/#state.ChangeSet) from the given change
+    description, taking the state's document length and line
+    separator into account.
+    */
+    changes(spec = []) {
+      if (spec instanceof ChangeSet)
+        return spec;
+      return ChangeSet.of(spec, this.doc.length, this.facet(_EditorState.lineSeparator));
+    }
+    /**
+    Using the state's [line
+    separator](https://codemirror.net/6/docs/ref/#state.EditorState^lineSeparator), create a
+    [`Text`](https://codemirror.net/6/docs/ref/#state.Text) instance from the given string.
+    */
+    toText(string2) {
+      return Text.of(string2.split(this.facet(_EditorState.lineSeparator) || DefaultSplit));
+    }
+    /**
+    Return the given range of the document as a string.
+    */
+    sliceDoc(from = 0, to = this.doc.length) {
+      return this.doc.sliceString(from, to, this.lineBreak);
+    }
+    /**
+    Get the value of a state [facet](https://codemirror.net/6/docs/ref/#state.Facet).
+    */
+    facet(facet) {
+      let addr = this.config.address[facet.id];
+      if (addr == null)
+        return facet.default;
+      ensureAddr(this, addr);
+      return getAddr(this, addr);
+    }
+    /**
+    Convert this state to a JSON-serializable object. When custom
+    fields should be serialized, you can pass them in as an object
+    mapping property names (in the resulting object, which should
+    not use `doc` or `selection`) to fields.
+    */
+    toJSON(fields) {
+      let result = {
+        doc: this.sliceDoc(),
+        selection: this.selection.toJSON()
+      };
+      if (fields)
+        for (let prop in fields) {
+          let value = fields[prop];
+          if (value instanceof StateField && this.config.address[value.id] != null)
+            result[prop] = value.spec.toJSON(this.field(fields[prop]), this);
+        }
+      return result;
+    }
+    /**
+    Deserialize a state from its JSON representation. When custom
+    fields should be deserialized, pass the same object you passed
+    to [`toJSON`](https://codemirror.net/6/docs/ref/#state.EditorState.toJSON) when serializing as
+    third argument.
+    */
+    static fromJSON(json, config2 = {}, fields) {
+      if (!json || typeof json.doc != "string")
+        throw new RangeError("Invalid JSON representation for EditorState");
+      let fieldInit = [];
+      if (fields)
+        for (let prop in fields) {
+          if (Object.prototype.hasOwnProperty.call(json, prop)) {
+            let field = fields[prop], value = json[prop];
+            fieldInit.push(field.init((state) => field.spec.fromJSON(value, state)));
+          }
+        }
+      return _EditorState.create({
+        doc: json.doc,
+        selection: EditorSelection.fromJSON(json.selection),
+        extensions: config2.extensions ? fieldInit.concat([config2.extensions]) : fieldInit
+      });
+    }
+    /**
+    Create a new state. You'll usually only need this when
+    initializing an editor—updated states are created by applying
+    transactions.
+    */
+    static create(config2 = {}) {
+      let configuration = Configuration.resolve(config2.extensions || [], /* @__PURE__ */ new Map());
+      let doc2 = config2.doc instanceof Text ? config2.doc : Text.of((config2.doc || "").split(configuration.staticFacet(_EditorState.lineSeparator) || DefaultSplit));
+      let selection = !config2.selection ? EditorSelection.single(0) : config2.selection instanceof EditorSelection ? config2.selection : EditorSelection.single(config2.selection.anchor, config2.selection.head);
+      checkSelection(selection, doc2.length);
+      if (!configuration.staticFacet(allowMultipleSelections))
+        selection = selection.asSingle();
+      return new _EditorState(configuration, doc2, selection, configuration.dynamicSlots.map(() => null), (state, slot) => slot.create(state), null);
+    }
+    /**
+    The size (in columns) of a tab in the document, determined by
+    the [`tabSize`](https://codemirror.net/6/docs/ref/#state.EditorState^tabSize) facet.
+    */
+    get tabSize() {
+      return this.facet(_EditorState.tabSize);
+    }
+    /**
+    Get the proper [line-break](https://codemirror.net/6/docs/ref/#state.EditorState^lineSeparator)
+    string for this state.
+    */
+    get lineBreak() {
+      return this.facet(_EditorState.lineSeparator) || "\n";
+    }
+    /**
+    Returns true when the editor is
+    [configured](https://codemirror.net/6/docs/ref/#state.EditorState^readOnly) to be read-only.
+    */
+    get readOnly() {
+      return this.facet(readOnly);
+    }
+    /**
+    Look up a translation for the given phrase (via the
+    [`phrases`](https://codemirror.net/6/docs/ref/#state.EditorState^phrases) facet), or return the
+    original string if no translation is found.
+    
+    If additional arguments are passed, they will be inserted in
+    place of markers like `$1` (for the first value) and `$2`, etc.
+    A single `$` is equivalent to `$1`, and `$$` will produce a
+    literal dollar sign.
+    */
+    phrase(phrase2, ...insert2) {
+      for (let map of this.facet(_EditorState.phrases))
+        if (Object.prototype.hasOwnProperty.call(map, phrase2)) {
+          phrase2 = map[phrase2];
+          break;
+        }
+      if (insert2.length)
+        phrase2 = phrase2.replace(/\$(\$|\d*)/g, (m, i) => {
+          if (i == "$")
+            return "$";
+          let n = +(i || 1);
+          return !n || n > insert2.length ? m : insert2[n - 1];
+        });
+      return phrase2;
+    }
+    /**
+    Find the values for a given language data field, provided by the
+    the [`languageData`](https://codemirror.net/6/docs/ref/#state.EditorState^languageData) facet.
+    
+    Examples of language data fields are...
+    
+    - [`"commentTokens"`](https://codemirror.net/6/docs/ref/#commands.CommentTokens) for specifying
+      comment syntax.
+    - [`"autocomplete"`](https://codemirror.net/6/docs/ref/#autocomplete.autocompletion^config.override)
+      for providing language-specific completion sources.
+    - [`"wordChars"`](https://codemirror.net/6/docs/ref/#state.EditorState.charCategorizer) for adding
+      characters that should be considered part of words in this
+      language.
+    - [`"closeBrackets"`](https://codemirror.net/6/docs/ref/#autocomplete.CloseBracketConfig) controls
+      bracket closing behavior.
+    */
+    languageDataAt(name2, pos, side = -1) {
+      let values = [];
+      for (let provider of this.facet(languageData)) {
+        for (let result of provider(this, pos, side)) {
+          if (Object.prototype.hasOwnProperty.call(result, name2))
+            values.push(result[name2]);
+        }
+      }
+      return values;
+    }
+    /**
+    Return a function that can categorize strings (expected to
+    represent a single [grapheme cluster](https://codemirror.net/6/docs/ref/#state.findClusterBreak))
+    into one of:
+    
+     - Word (contains an alphanumeric character or a character
+       explicitly listed in the local language's `"wordChars"`
+       language data, which should be a string)
+     - Space (contains only whitespace)
+     - Other (anything else)
+    */
+    charCategorizer(at) {
+      let chars = this.languageDataAt("wordChars", at);
+      return makeCategorizer(chars.length ? chars[0] : "");
+    }
+    /**
+    Find the word at the given position, meaning the range
+    containing all [word](https://codemirror.net/6/docs/ref/#state.CharCategory.Word) characters
+    around it. If no word characters are adjacent to the position,
+    this returns null.
+    */
+    wordAt(pos) {
+      let { text, from, length } = this.doc.lineAt(pos);
+      let cat = this.charCategorizer(pos);
+      let start = pos - from, end = pos - from;
+      while (start > 0) {
+        let prev = findClusterBreak2(text, start, false);
+        if (cat(text.slice(prev, start)) != CharCategory.Word)
+          break;
+        start = prev;
+      }
+      while (end < length) {
+        let next = findClusterBreak2(text, end);
+        if (cat(text.slice(end, next)) != CharCategory.Word)
+          break;
+        end = next;
+      }
+      return start == end ? null : EditorSelection.range(start + from, end + from);
+    }
+  };
+  EditorState.allowMultipleSelections = allowMultipleSelections;
+  EditorState.tabSize = /* @__PURE__ */ Facet.define({
+    combine: (values) => values.length ? values[0] : 4
+  });
+  EditorState.lineSeparator = lineSeparator;
+  EditorState.readOnly = readOnly;
+  EditorState.phrases = /* @__PURE__ */ Facet.define({
+    compare(a, b) {
+      let kA = Object.keys(a), kB = Object.keys(b);
+      return kA.length == kB.length && kA.every((k) => a[k] == b[k]);
+    }
+  });
+  EditorState.languageData = languageData;
+  EditorState.changeFilter = changeFilter;
+  EditorState.transactionFilter = transactionFilter;
+  EditorState.transactionExtender = transactionExtender;
+  Compartment.reconfigure = /* @__PURE__ */ StateEffect.define();
+  function combineConfig(configs, defaults3, combine = {}) {
+    let result = {};
+    for (let config2 of configs)
+      for (let key of Object.keys(config2)) {
+        let value = config2[key], current = result[key];
+        if (current === void 0)
+          result[key] = value;
+        else if (current === value || value === void 0) ;
+        else if (Object.hasOwnProperty.call(combine, key))
+          result[key] = combine[key](current, value);
+        else
+          throw new Error("Config merge conflict for field " + key);
+      }
+    for (let key in defaults3)
+      if (result[key] === void 0)
+        result[key] = defaults3[key];
+    return result;
+  }
+  var RangeValue = class {
+    /**
+    Compare this value with another value. Used when comparing
+    rangesets. The default implementation compares by identity.
+    Unless you are only creating a fixed number of unique instances
+    of your value type, it is a good idea to implement this
+    properly.
+    */
+    eq(other) {
+      return this == other;
+    }
+    /**
+    Create a [range](https://codemirror.net/6/docs/ref/#state.Range) with this value.
+    */
+    range(from, to = from) {
+      return Range.create(from, to, this);
+    }
+  };
+  RangeValue.prototype.startSide = RangeValue.prototype.endSide = 0;
+  RangeValue.prototype.point = false;
+  RangeValue.prototype.mapMode = MapMode.TrackDel;
+  function cmpVal(a, b) {
+    return a == b || a.constructor == b.constructor && a.eq(b);
+  }
+  var Range = class _Range {
+    constructor(from, to, value) {
+      this.from = from;
+      this.to = to;
+      this.value = value;
+    }
+    /**
+    @internal
+    */
+    static create(from, to, value) {
+      return new _Range(from, to, value);
+    }
+  };
+  function cmpRange(a, b) {
+    return a.from - b.from || a.value.startSide - b.value.startSide;
+  }
+  var Chunk = class _Chunk {
+    constructor(from, to, value, maxPoint) {
+      this.from = from;
+      this.to = to;
+      this.value = value;
+      this.maxPoint = maxPoint;
+    }
+    get length() {
+      return this.to[this.to.length - 1];
+    }
+    // Find the index of the given position and side. Use the ranges'
+    // `from` pos when `end == false`, `to` when `end == true`.
+    findIndex(pos, side, end, startAt = 0) {
+      let arr = end ? this.to : this.from;
+      for (let lo = startAt, hi = arr.length; ; ) {
+        if (lo == hi)
+          return lo;
+        let mid = lo + hi >> 1;
+        let diff = arr[mid] - pos || (end ? this.value[mid].endSide : this.value[mid].startSide) - side;
+        if (mid == lo)
+          return diff >= 0 ? lo : hi;
+        if (diff >= 0)
+          hi = mid;
+        else
+          lo = mid + 1;
+      }
+    }
+    between(offset, from, to, f) {
+      for (let i = this.findIndex(from, -1e9, true), e = this.findIndex(to, 1e9, false, i); i < e; i++)
+        if (f(this.from[i] + offset, this.to[i] + offset, this.value[i]) === false)
+          return false;
+    }
+    map(offset, changes) {
+      let value = [], from = [], to = [], newPos = -1, maxPoint = -1;
+      for (let i = 0; i < this.value.length; i++) {
+        let val = this.value[i], curFrom = this.from[i] + offset, curTo = this.to[i] + offset, newFrom, newTo;
+        if (curFrom == curTo) {
+          let mapped = changes.mapPos(curFrom, val.startSide, val.mapMode);
+          if (mapped == null)
+            continue;
+          newFrom = newTo = mapped;
+          if (val.startSide != val.endSide) {
+            newTo = changes.mapPos(curFrom, val.endSide);
+            if (newTo < newFrom)
+              continue;
+          }
+        } else {
+          newFrom = changes.mapPos(curFrom, val.startSide);
+          newTo = changes.mapPos(curTo, val.endSide);
+          if (newFrom > newTo || newFrom == newTo && val.startSide > 0 && val.endSide <= 0)
+            continue;
+        }
+        if ((newTo - newFrom || val.endSide - val.startSide) < 0)
+          continue;
+        if (newPos < 0)
+          newPos = newFrom;
+        if (val.point)
+          maxPoint = Math.max(maxPoint, newTo - newFrom);
+        value.push(val);
+        from.push(newFrom - newPos);
+        to.push(newTo - newPos);
+      }
+      return { mapped: value.length ? new _Chunk(from, to, value, maxPoint) : null, pos: newPos };
+    }
+  };
+  var RangeSet = class _RangeSet {
+    constructor(chunkPos, chunk, nextLayer, maxPoint) {
+      this.chunkPos = chunkPos;
+      this.chunk = chunk;
+      this.nextLayer = nextLayer;
+      this.maxPoint = maxPoint;
+    }
+    /**
+    @internal
+    */
+    static create(chunkPos, chunk, nextLayer, maxPoint) {
+      return new _RangeSet(chunkPos, chunk, nextLayer, maxPoint);
+    }
+    /**
+    @internal
+    */
+    get length() {
+      let last = this.chunk.length - 1;
+      return last < 0 ? 0 : Math.max(this.chunkEnd(last), this.nextLayer.length);
+    }
+    /**
+    The number of ranges in the set.
+    */
+    get size() {
+      if (this.isEmpty)
+        return 0;
+      let size = this.nextLayer.size;
+      for (let chunk of this.chunk)
+        size += chunk.value.length;
+      return size;
+    }
+    /**
+    @internal
+    */
+    chunkEnd(index) {
+      return this.chunkPos[index] + this.chunk[index].length;
+    }
+    /**
+    Update the range set, optionally adding new ranges or filtering
+    out existing ones.
+    
+    (Note: The type parameter is just there as a kludge to work
+    around TypeScript variance issues that prevented `RangeSet`
+    from being a subtype of `RangeSet` when `X` is a subtype of
+    `Y`.)
+    */
+    update(updateSpec) {
+      let { add: add2 = [], sort = false, filterFrom = 0, filterTo = this.length } = updateSpec;
+      let filter = updateSpec.filter;
+      if (add2.length == 0 && !filter)
+        return this;
+      if (sort)
+        add2 = add2.slice().sort(cmpRange);
+      if (this.isEmpty)
+        return add2.length ? _RangeSet.of(add2) : this;
+      let cur2 = new LayerCursor(this, null, -1).goto(0), i = 0, spill = [];
+      let builder = new RangeSetBuilder();
+      while (cur2.value || i < add2.length) {
+        if (i < add2.length && (cur2.from - add2[i].from || cur2.startSide - add2[i].value.startSide) >= 0) {
+          let range = add2[i++];
+          if (!builder.addInner(range.from, range.to, range.value))
+            spill.push(range);
+        } else if (cur2.rangeIndex == 1 && cur2.chunkIndex < this.chunk.length && (i == add2.length || this.chunkEnd(cur2.chunkIndex) < add2[i].from) && (!filter || filterFrom > this.chunkEnd(cur2.chunkIndex) || filterTo < this.chunkPos[cur2.chunkIndex]) && builder.addChunk(this.chunkPos[cur2.chunkIndex], this.chunk[cur2.chunkIndex])) {
+          cur2.nextChunk();
+        } else {
+          if (!filter || filterFrom > cur2.to || filterTo < cur2.from || filter(cur2.from, cur2.to, cur2.value)) {
+            if (!builder.addInner(cur2.from, cur2.to, cur2.value))
+              spill.push(Range.create(cur2.from, cur2.to, cur2.value));
+          }
+          cur2.next();
+        }
+      }
+      return builder.finishInner(this.nextLayer.isEmpty && !spill.length ? _RangeSet.empty : this.nextLayer.update({ add: spill, filter, filterFrom, filterTo }));
+    }
+    /**
+    Map this range set through a set of changes, return the new set.
+    */
+    map(changes) {
+      if (changes.empty || this.isEmpty)
+        return this;
+      let chunks = [], chunkPos = [], maxPoint = -1;
+      for (let i = 0; i < this.chunk.length; i++) {
+        let start = this.chunkPos[i], chunk = this.chunk[i];
+        let touch = changes.touchesRange(start, start + chunk.length);
+        if (touch === false) {
+          maxPoint = Math.max(maxPoint, chunk.maxPoint);
+          chunks.push(chunk);
+          chunkPos.push(changes.mapPos(start));
+        } else if (touch === true) {
+          let { mapped, pos } = chunk.map(start, changes);
+          if (mapped) {
+            maxPoint = Math.max(maxPoint, mapped.maxPoint);
+            chunks.push(mapped);
+            chunkPos.push(pos);
+          }
+        }
+      }
+      let next = this.nextLayer.map(changes);
+      return chunks.length == 0 ? next : new _RangeSet(chunkPos, chunks, next || _RangeSet.empty, maxPoint);
+    }
+    /**
+    Iterate over the ranges that touch the region `from` to `to`,
+    calling `f` for each. There is no guarantee that the ranges will
+    be reported in any specific order. When the callback returns
+    `false`, iteration stops.
+    */
+    between(from, to, f) {
+      if (this.isEmpty)
+        return;
+      for (let i = 0; i < this.chunk.length; i++) {
+        let start = this.chunkPos[i], chunk = this.chunk[i];
+        if (to >= start && from <= start + chunk.length && chunk.between(start, from - start, to - start, f) === false)
+          return;
+      }
+      this.nextLayer.between(from, to, f);
+    }
+    /**
+    Iterate over the ranges in this set, in order, including all
+    ranges that end at or after `from`.
+    */
+    iter(from = 0) {
+      return HeapCursor.from([this]).goto(from);
+    }
+    /**
+    @internal
+    */
+    get isEmpty() {
+      return this.nextLayer == this;
+    }
+    /**
+    Iterate over the ranges in a collection of sets, in order,
+    starting from `from`.
+    */
+    static iter(sets, from = 0) {
+      return HeapCursor.from(sets).goto(from);
+    }
+    /**
+    Iterate over two groups of sets, calling methods on `comparator`
+    to notify it of possible differences.
+    */
+    static compare(oldSets, newSets, textDiff, comparator, minPointSize = -1) {
+      let a = oldSets.filter((set) => set.maxPoint > 0 || !set.isEmpty && set.maxPoint >= minPointSize);
+      let b = newSets.filter((set) => set.maxPoint > 0 || !set.isEmpty && set.maxPoint >= minPointSize);
+      let sharedChunks = findSharedChunks(a, b, textDiff);
+      let sideA = new SpanCursor(a, sharedChunks, minPointSize);
+      let sideB = new SpanCursor(b, sharedChunks, minPointSize);
+      textDiff.iterGaps((fromA, fromB, length) => compare(sideA, fromA, sideB, fromB, length, comparator));
+      if (textDiff.empty && textDiff.length == 0)
+        compare(sideA, 0, sideB, 0, 0, comparator);
+    }
+    /**
+    Compare the contents of two groups of range sets, returning true
+    if they are equivalent in the given range.
+    */
+    static eq(oldSets, newSets, from = 0, to) {
+      if (to == null)
+        to = 1e9 - 1;
+      let a = oldSets.filter((set) => !set.isEmpty && newSets.indexOf(set) < 0);
+      let b = newSets.filter((set) => !set.isEmpty && oldSets.indexOf(set) < 0);
+      if (a.length != b.length)
+        return false;
+      if (!a.length)
+        return true;
+      let sharedChunks = findSharedChunks(a, b);
+      let sideA = new SpanCursor(a, sharedChunks, 0).goto(from), sideB = new SpanCursor(b, sharedChunks, 0).goto(from);
+      for (; ; ) {
+        if (sideA.to != sideB.to || !sameValues(sideA.active, sideB.active) || sideA.point && (!sideB.point || !cmpVal(sideA.point, sideB.point)))
+          return false;
+        if (sideA.to > to)
+          return true;
+        sideA.next();
+        sideB.next();
+      }
+    }
+    /**
+    Iterate over a group of range sets at the same time, notifying
+    the iterator about the ranges covering every given piece of
+    content. Returns the open count (see
+    [`SpanIterator.span`](https://codemirror.net/6/docs/ref/#state.SpanIterator.span)) at the end
+    of the iteration.
+    */
+    static spans(sets, from, to, iterator, minPointSize = -1) {
+      let cursor = new SpanCursor(sets, null, minPointSize).goto(from), pos = from;
+      let openRanges = cursor.openStart;
+      for (; ; ) {
+        let curTo = Math.min(cursor.to, to);
+        if (cursor.point) {
+          let active = cursor.activeForPoint(cursor.to);
+          let openCount = cursor.pointFrom < from ? active.length + 1 : cursor.point.startSide < 0 ? active.length : Math.min(active.length, openRanges);
+          iterator.point(pos, curTo, cursor.point, active, openCount, cursor.pointRank);
+          openRanges = Math.min(cursor.openEnd(curTo), active.length);
+        } else if (curTo > pos) {
+          iterator.span(pos, curTo, cursor.active, openRanges);
+          openRanges = cursor.openEnd(curTo);
+        }
+        if (cursor.to > to)
+          return openRanges + (cursor.point && cursor.to > to ? 1 : 0);
+        pos = cursor.to;
+        cursor.next();
+      }
+    }
+    /**
+    Create a range set for the given range or array of ranges. By
+    default, this expects the ranges to be _sorted_ (by start
+    position and, if two start at the same position,
+    `value.startSide`). You can pass `true` as second argument to
+    cause the method to sort them.
+    */
+    static of(ranges, sort = false) {
+      let build = new RangeSetBuilder();
+      for (let range of ranges instanceof Range ? [ranges] : sort ? lazySort(ranges) : ranges)
+        build.add(range.from, range.to, range.value);
+      return build.finish();
+    }
+    /**
+    Join an array of range sets into a single set.
+    */
+    static join(sets) {
+      if (!sets.length)
+        return _RangeSet.empty;
+      let result = sets[sets.length - 1];
+      for (let i = sets.length - 2; i >= 0; i--) {
+        for (let layer2 = sets[i]; layer2 != _RangeSet.empty; layer2 = layer2.nextLayer)
+          result = new _RangeSet(layer2.chunkPos, layer2.chunk, result, Math.max(layer2.maxPoint, result.maxPoint));
+      }
+      return result;
+    }
+  };
+  RangeSet.empty = /* @__PURE__ */ new RangeSet([], [], null, -1);
+  function lazySort(ranges) {
+    if (ranges.length > 1)
+      for (let prev = ranges[0], i = 1; i < ranges.length; i++) {
+        let cur2 = ranges[i];
+        if (cmpRange(prev, cur2) > 0)
+          return ranges.slice().sort(cmpRange);
+        prev = cur2;
+      }
+    return ranges;
+  }
+  RangeSet.empty.nextLayer = RangeSet.empty;
+  var RangeSetBuilder = class _RangeSetBuilder {
+    finishChunk(newArrays) {
+      this.chunks.push(new Chunk(this.from, this.to, this.value, this.maxPoint));
+      this.chunkPos.push(this.chunkStart);
+      this.chunkStart = -1;
+      this.setMaxPoint = Math.max(this.setMaxPoint, this.maxPoint);
+      this.maxPoint = -1;
+      if (newArrays) {
+        this.from = [];
+        this.to = [];
+        this.value = [];
+      }
+    }
+    /**
+    Create an empty builder.
+    */
+    constructor() {
+      this.chunks = [];
+      this.chunkPos = [];
+      this.chunkStart = -1;
+      this.last = null;
+      this.lastFrom = -1e9;
+      this.lastTo = -1e9;
+      this.from = [];
+      this.to = [];
+      this.value = [];
+      this.maxPoint = -1;
+      this.setMaxPoint = -1;
+      this.nextLayer = null;
+    }
+    /**
+    Add a range. Ranges should be added in sorted (by `from` and
+    `value.startSide`) order.
+    */
+    add(from, to, value) {
+      if (!this.addInner(from, to, value))
+        (this.nextLayer || (this.nextLayer = new _RangeSetBuilder())).add(from, to, value);
+    }
+    /**
+    @internal
+    */
+    addInner(from, to, value) {
+      let diff = from - this.lastTo || value.startSide - this.last.endSide;
+      if (diff <= 0 && (from - this.lastFrom || value.startSide - this.last.startSide) < 0)
+        throw new Error("Ranges must be added sorted by `from` position and `startSide`");
+      if (diff < 0)
+        return false;
+      if (this.from.length == 250)
+        this.finishChunk(true);
+      if (this.chunkStart < 0)
+        this.chunkStart = from;
+      this.from.push(from - this.chunkStart);
+      this.to.push(to - this.chunkStart);
+      this.last = value;
+      this.lastFrom = from;
+      this.lastTo = to;
+      this.value.push(value);
+      if (value.point)
+        this.maxPoint = Math.max(this.maxPoint, to - from);
+      return true;
+    }
+    /**
+    @internal
+    */
+    addChunk(from, chunk) {
+      if ((from - this.lastTo || chunk.value[0].startSide - this.last.endSide) < 0)
+        return false;
+      if (this.from.length)
+        this.finishChunk(true);
+      this.setMaxPoint = Math.max(this.setMaxPoint, chunk.maxPoint);
+      this.chunks.push(chunk);
+      this.chunkPos.push(from);
+      let last = chunk.value.length - 1;
+      this.last = chunk.value[last];
+      this.lastFrom = chunk.from[last] + from;
+      this.lastTo = chunk.to[last] + from;
+      return true;
+    }
+    /**
+    Finish the range set. Returns the new set. The builder can't be
+    used anymore after this has been called.
+    */
+    finish() {
+      return this.finishInner(RangeSet.empty);
+    }
+    /**
+    @internal
+    */
+    finishInner(next) {
+      if (this.from.length)
+        this.finishChunk(false);
+      if (this.chunks.length == 0)
+        return next;
+      let result = RangeSet.create(this.chunkPos, this.chunks, this.nextLayer ? this.nextLayer.finishInner(next) : next, this.setMaxPoint);
+      this.from = null;
+      return result;
+    }
+  };
+  function findSharedChunks(a, b, textDiff) {
+    let inA = /* @__PURE__ */ new Map();
+    for (let set of a)
+      for (let i = 0; i < set.chunk.length; i++)
+        if (set.chunk[i].maxPoint <= 0)
+          inA.set(set.chunk[i], set.chunkPos[i]);
+    let shared = /* @__PURE__ */ new Set();
+    for (let set of b)
+      for (let i = 0; i < set.chunk.length; i++) {
+        let known = inA.get(set.chunk[i]);
+        if (known != null && (textDiff ? textDiff.mapPos(known) : known) == set.chunkPos[i] && !(textDiff === null || textDiff === void 0 ? void 0 : textDiff.touchesRange(known, known + set.chunk[i].length)))
+          shared.add(set.chunk[i]);
+      }
+    return shared;
+  }
+  var LayerCursor = class {
+    constructor(layer2, skip, minPoint, rank = 0) {
+      this.layer = layer2;
+      this.skip = skip;
+      this.minPoint = minPoint;
+      this.rank = rank;
+    }
+    get startSide() {
+      return this.value ? this.value.startSide : 0;
+    }
+    get endSide() {
+      return this.value ? this.value.endSide : 0;
+    }
+    goto(pos, side = -1e9) {
+      this.chunkIndex = this.rangeIndex = 0;
+      this.gotoInner(pos, side, false);
+      return this;
+    }
+    gotoInner(pos, side, forward) {
+      while (this.chunkIndex < this.layer.chunk.length) {
+        let next = this.layer.chunk[this.chunkIndex];
+        if (!(this.skip && this.skip.has(next) || this.layer.chunkEnd(this.chunkIndex) < pos || next.maxPoint < this.minPoint))
+          break;
+        this.chunkIndex++;
+        forward = false;
+      }
+      if (this.chunkIndex < this.layer.chunk.length) {
+        let rangeIndex = this.layer.chunk[this.chunkIndex].findIndex(pos - this.layer.chunkPos[this.chunkIndex], side, true);
+        if (!forward || this.rangeIndex < rangeIndex)
+          this.setRangeIndex(rangeIndex);
+      }
+      this.next();
+    }
+    forward(pos, side) {
+      if ((this.to - pos || this.endSide - side) < 0)
+        this.gotoInner(pos, side, true);
+    }
+    next() {
+      for (; ; ) {
+        if (this.chunkIndex == this.layer.chunk.length) {
+          this.from = this.to = 1e9;
+          this.value = null;
+          break;
+        } else {
+          let chunkPos = this.layer.chunkPos[this.chunkIndex], chunk = this.layer.chunk[this.chunkIndex];
+          let from = chunkPos + chunk.from[this.rangeIndex];
+          this.from = from;
+          this.to = chunkPos + chunk.to[this.rangeIndex];
+          this.value = chunk.value[this.rangeIndex];
+          this.setRangeIndex(this.rangeIndex + 1);
+          if (this.minPoint < 0 || this.value.point && this.to - this.from >= this.minPoint)
+            break;
+        }
+      }
+    }
+    setRangeIndex(index) {
+      if (index == this.layer.chunk[this.chunkIndex].value.length) {
+        this.chunkIndex++;
+        if (this.skip) {
+          while (this.chunkIndex < this.layer.chunk.length && this.skip.has(this.layer.chunk[this.chunkIndex]))
+            this.chunkIndex++;
+        }
+        this.rangeIndex = 0;
+      } else {
+        this.rangeIndex = index;
+      }
+    }
+    nextChunk() {
+      this.chunkIndex++;
+      this.rangeIndex = 0;
+      this.next();
+    }
+    compare(other) {
+      return this.from - other.from || this.startSide - other.startSide || this.rank - other.rank || this.to - other.to || this.endSide - other.endSide;
+    }
+  };
+  var HeapCursor = class _HeapCursor {
+    constructor(heap) {
+      this.heap = heap;
+    }
+    static from(sets, skip = null, minPoint = -1) {
+      let heap = [];
+      for (let i = 0; i < sets.length; i++) {
+        for (let cur2 = sets[i]; !cur2.isEmpty; cur2 = cur2.nextLayer) {
+          if (cur2.maxPoint >= minPoint)
+            heap.push(new LayerCursor(cur2, skip, minPoint, i));
+        }
+      }
+      return heap.length == 1 ? heap[0] : new _HeapCursor(heap);
+    }
+    get startSide() {
+      return this.value ? this.value.startSide : 0;
+    }
+    goto(pos, side = -1e9) {
+      for (let cur2 of this.heap)
+        cur2.goto(pos, side);
+      for (let i = this.heap.length >> 1; i >= 0; i--)
+        heapBubble(this.heap, i);
+      this.next();
+      return this;
+    }
+    forward(pos, side) {
+      for (let cur2 of this.heap)
+        cur2.forward(pos, side);
+      for (let i = this.heap.length >> 1; i >= 0; i--)
+        heapBubble(this.heap, i);
+      if ((this.to - pos || this.value.endSide - side) < 0)
+        this.next();
+    }
+    next() {
+      if (this.heap.length == 0) {
+        this.from = this.to = 1e9;
+        this.value = null;
+        this.rank = -1;
+      } else {
+        let top2 = this.heap[0];
+        this.from = top2.from;
+        this.to = top2.to;
+        this.value = top2.value;
+        this.rank = top2.rank;
+        if (top2.value)
+          top2.next();
+        heapBubble(this.heap, 0);
+      }
+    }
+  };
+  function heapBubble(heap, index) {
+    for (let cur2 = heap[index]; ; ) {
+      let childIndex = (index << 1) + 1;
+      if (childIndex >= heap.length)
+        break;
+      let child = heap[childIndex];
+      if (childIndex + 1 < heap.length && child.compare(heap[childIndex + 1]) >= 0) {
+        child = heap[childIndex + 1];
+        childIndex++;
+      }
+      if (cur2.compare(child) < 0)
+        break;
+      heap[childIndex] = cur2;
+      heap[index] = child;
+      index = childIndex;
+    }
+  }
+  var SpanCursor = class {
+    constructor(sets, skip, minPoint) {
+      this.minPoint = minPoint;
+      this.active = [];
+      this.activeTo = [];
+      this.activeRank = [];
+      this.minActive = -1;
+      this.point = null;
+      this.pointFrom = 0;
+      this.pointRank = 0;
+      this.to = -1e9;
+      this.endSide = 0;
+      this.openStart = -1;
+      this.cursor = HeapCursor.from(sets, skip, minPoint);
+    }
+    goto(pos, side = -1e9) {
+      this.cursor.goto(pos, side);
+      this.active.length = this.activeTo.length = this.activeRank.length = 0;
+      this.minActive = -1;
+      this.to = pos;
+      this.endSide = side;
+      this.openStart = -1;
+      this.next();
+      return this;
+    }
+    forward(pos, side) {
+      while (this.minActive > -1 && (this.activeTo[this.minActive] - pos || this.active[this.minActive].endSide - side) < 0)
+        this.removeActive(this.minActive);
+      this.cursor.forward(pos, side);
+    }
+    removeActive(index) {
+      remove(this.active, index);
+      remove(this.activeTo, index);
+      remove(this.activeRank, index);
+      this.minActive = findMinIndex(this.active, this.activeTo);
+    }
+    addActive(trackOpen) {
+      let i = 0, { value, to, rank } = this.cursor;
+      while (i < this.activeRank.length && (rank - this.activeRank[i] || to - this.activeTo[i]) > 0)
+        i++;
+      insert(this.active, i, value);
+      insert(this.activeTo, i, to);
+      insert(this.activeRank, i, rank);
+      if (trackOpen)
+        insert(trackOpen, i, this.cursor.from);
+      this.minActive = findMinIndex(this.active, this.activeTo);
+    }
+    // After calling this, if `this.point` != null, the next range is a
+    // point. Otherwise, it's a regular range, covered by `this.active`.
+    next() {
+      let from = this.to, wasPoint = this.point;
+      this.point = null;
+      let trackOpen = this.openStart < 0 ? [] : null;
+      for (; ; ) {
+        let a = this.minActive;
+        if (a > -1 && (this.activeTo[a] - this.cursor.from || this.active[a].endSide - this.cursor.startSide) < 0) {
+          if (this.activeTo[a] > from) {
+            this.to = this.activeTo[a];
+            this.endSide = this.active[a].endSide;
+            break;
+          }
+          this.removeActive(a);
+          if (trackOpen)
+            remove(trackOpen, a);
+        } else if (!this.cursor.value) {
+          this.to = this.endSide = 1e9;
+          break;
+        } else if (this.cursor.from > from) {
+          this.to = this.cursor.from;
+          this.endSide = this.cursor.startSide;
+          break;
+        } else {
+          let nextVal = this.cursor.value;
+          if (!nextVal.point) {
+            this.addActive(trackOpen);
+            this.cursor.next();
+          } else if (wasPoint && this.cursor.to == this.to && this.cursor.from < this.cursor.to) {
+            this.cursor.next();
+          } else {
+            this.point = nextVal;
+            this.pointFrom = this.cursor.from;
+            this.pointRank = this.cursor.rank;
+            this.to = this.cursor.to;
+            this.endSide = nextVal.endSide;
+            this.cursor.next();
+            this.forward(this.to, this.endSide);
+            break;
+          }
+        }
+      }
+      if (trackOpen) {
+        this.openStart = 0;
+        for (let i = trackOpen.length - 1; i >= 0 && trackOpen[i] < from; i--)
+          this.openStart++;
+      }
+    }
+    activeForPoint(to) {
+      if (!this.active.length)
+        return this.active;
+      let active = [];
+      for (let i = this.active.length - 1; i >= 0; i--) {
+        if (this.activeRank[i] < this.pointRank)
+          break;
+        if (this.activeTo[i] > to || this.activeTo[i] == to && this.active[i].endSide >= this.point.endSide)
+          active.push(this.active[i]);
+      }
+      return active.reverse();
+    }
+    openEnd(to) {
+      let open = 0;
+      for (let i = this.activeTo.length - 1; i >= 0 && this.activeTo[i] > to; i--)
+        open++;
+      return open;
+    }
+  };
+  function compare(a, startA, b, startB, length, comparator) {
+    a.goto(startA);
+    b.goto(startB);
+    let endB = startB + length;
+    let pos = startB, dPos = startB - startA;
+    let bounds = !!comparator.boundChange;
+    for (let boundChange = false; ; ) {
+      let dEnd = a.to + dPos - b.to, diff = dEnd || a.endSide - b.endSide;
+      let end = diff < 0 ? a.to + dPos : b.to, clipEnd = Math.min(end, endB);
+      let point = a.point || b.point;
+      if (point) {
+        if (!(a.point && b.point && cmpVal(a.point, b.point) && sameValues(a.activeForPoint(a.to), b.activeForPoint(b.to))))
+          comparator.comparePoint(pos, clipEnd, a.point, b.point);
+        boundChange = false;
+      } else {
+        if (boundChange)
+          comparator.boundChange(pos);
+        if (clipEnd > pos && !sameValues(a.active, b.active))
+          comparator.compareRange(pos, clipEnd, a.active, b.active);
+        if (bounds && clipEnd < endB && (dEnd || a.openEnd(end) != b.openEnd(end)))
+          boundChange = true;
+      }
+      if (end > endB)
+        break;
+      pos = end;
+      if (diff <= 0)
+        a.next();
+      if (diff >= 0)
+        b.next();
+    }
+  }
+  function sameValues(a, b) {
+    if (a.length != b.length)
+      return false;
+    for (let i = 0; i < a.length; i++)
+      if (a[i] != b[i] && !cmpVal(a[i], b[i]))
+        return false;
+    return true;
+  }
+  function remove(array, index) {
+    for (let i = index, e = array.length - 1; i < e; i++)
+      array[i] = array[i + 1];
+    array.pop();
+  }
+  function insert(array, index, value) {
+    for (let i = array.length - 1; i >= index; i--)
+      array[i + 1] = array[i];
+    array[index] = value;
+  }
+  function findMinIndex(value, array) {
+    let found = -1, foundPos = 1e9;
+    for (let i = 0; i < array.length; i++)
+      if ((array[i] - foundPos || value[i].endSide - value[found].endSide) < 0) {
+        found = i;
+        foundPos = array[i];
+      }
+    return found;
+  }
+  function countColumn(string2, tabSize, to = string2.length) {
+    let n = 0;
+    for (let i = 0; i < to && i < string2.length; ) {
+      if (string2.charCodeAt(i) == 9) {
+        n += tabSize - n % tabSize;
+        i++;
+      } else {
+        n++;
+        i = findClusterBreak2(string2, i);
+      }
+    }
+    return n;
+  }
+  function findColumn(string2, col, tabSize, strict) {
+    for (let i = 0, n = 0; ; ) {
+      if (n >= col)
+        return i;
+      if (i == string2.length)
+        break;
+      n += string2.charCodeAt(i) == 9 ? tabSize - n % tabSize : 1;
+      i = findClusterBreak2(string2, i);
+    }
+    return strict === true ? -1 : string2.length;
+  }
+
+  // node_modules/style-mod/src/style-mod.js
+  var C = "\u037C";
+  var COUNT = typeof Symbol == "undefined" ? "__" + C : Symbol.for(C);
+  var SET = typeof Symbol == "undefined" ? "__styleSet" + Math.floor(Math.random() * 1e8) : /* @__PURE__ */ Symbol("styleSet");
+  var top = typeof globalThis != "undefined" ? globalThis : typeof window != "undefined" ? window : {};
+  var StyleModule = class {
+    // :: (ObjectFlame Graph Reset ZoomSearch dyld4::prepare(dyld4::APIs&, mach_o::Header const*) (1 samples, 0.38%)dyld4::APIs::runAllInitializersForMain() (1 samples, 0.38%)dyld4::PrebuiltLoader::runInitializers(dyld4::RuntimeState&) const (1 samples, 0.38%)dyld4::Loader::findAndRunAllInitializers(dyld4::RuntimeState&) const (1 samples, 0.38%)dyld3::MachOAnalyzer::forEachInitializer(Diagnostics&, dyld3::MachOAnalyzer::VMAddrConverter const&, void (unsigned int) block_pointer, void const*) const (1 samples, 0.38%)mach_o::Header::forEachSection(void (mach_o::Header::SectionInfo const&, bool&) block_pointer) const (1 samples, 0.38%)mach_o::Header::forEachLoadCommand(void (load_command const*, bool&) block_pointer) const (1 samples, 0.38%)invocation function for block in mach_o::Header::forEachSection(void (mach_o::Header::SectionInfo const&, bool&) block_pointer) const (1 samples, 0.38%)invocation function for block in dyld3::MachOAnalyzer::forEachInitializer(Diagnostics&, dyld3::MachOAnalyzer::VMAddrConverter const&, void (unsigned int) block_pointer, void const*) const (1 samples, 0.38%)invocation function for block in dyld4::Loader::findAndRunAllInitializers(dyld4::RuntimeState&) const (1 samples, 0.38%)libSystem_initializer (1 samples, 0.38%)_sanitizers_init (1 samples, 0.38%)void config::env::Parser::unsetEnv<18ul>(char const**, char const (&) [18ul]) (1 samples, 0.38%)<core::iter::adapters::cloned::Cloned<I> as core::iter::traits::unchecked_iterator::UncheckedIterator>::next_unchecked (1 samples, 0.38%)<dexpr::ast::value::Value as core::clone::Clone>::clone (1 samples, 0.38%)<core::ops::try_trait::NeverShortCircuit<T> as core::ops::try_trait::Try>::branch (2 samples, 0.75%)<core::result::Result<T,E> as core::ops::try_trait::Try>::branch (1 samples, 0.38%)_free (8 samples, 3.02%)_fr.._platform_memmove (4 samples, 1.51%)_xzm_free (4 samples, 1.51%)<alloc::string::String as core::fmt::Write>::write_str (4 samples, 1.51%)<core::ptr::non_null::NonNull<T> as core::cmp::PartialEq>::eq (2 samples, 0.75%)<str as core::fmt::Debug>::fmt (1 samples, 0.38%)<alloc::string::String as core::fmt::Write>::write_str (3 samples, 1.13%)<core::fmt::Formatter as core::fmt::Write>::write_char (3 samples, 1.13%)alloc::raw_vec::RawVecInner<A>::capacity (1 samples, 0.38%)<core::slice::iter::Iter<T> as core::iter::traits::iterator::Iterator>::position (9 samples, 3.40%)<co..<dexpr::ast::value::Value as core::fmt::Display>::fmt (1 samples, 0.38%)<core::slice::iter::Iter<T> as core::iter::traits::iterator::Iterator>::all (1 samples, 0.38%)_platform_memmove (1 samples, 0.38%)<rust_decimal::decimal::Decimal as core::fmt::Display>::fmt (3 samples, 1.13%)rust_decimal::str::to_str_internal (1 samples, 0.38%)<rust_decimal::decimal::Decimal as core::fmt::Debug>::fmt (4 samples, 1.51%)arrayvec::array_string::ArrayString<_>::len (1 samples, 0.38%)<str as core::fmt::Debug>::fmt (2 samples, 0.75%)<core::ptr::non_null::NonNull<T> as core::cmp::PartialEq>::eq (1 samples, 0.38%)core::fmt::Formatter::pad_integral (1 samples, 0.38%)core::fmt::Formatter::pad_integral::write_prefix (1 samples, 0.38%)core::fmt::Formatter::pad_integral (3 samples, 1.13%)core::fmt::Formatter::pad_integral::write_prefix (3 samples, 1.13%)core::ptr::copy_nonoverlapping (1 samples, 0.38%)DYLD-STUB$$memcpy (1 samples, 0.38%)rust_decimal::decimal::Decimal::mantissa_array3 (1 samples, 0.38%)<rust_decimal::decimal::Decimal as core::fmt::Display>::fmt (9 samples, 3.40%)<ru..rust_decimal::str::to_str_internal (2 samples, 0.75%)core::fmt::Formatter::write_fmt (11 samples, 4.15%)core:..core::fmt::rt::Argument::fmt (10 samples, 3.77%)core..core::fmt::Formatter::pad_integral (1 samples, 0.38%)<alloc::string::String as core::fmt::Write>::write_str (1 samples, 0.38%)_platform_memmove (5 samples, 1.89%)_..alloc::raw_vec::RawVecInner<A>::capacity (1 samples, 0.38%)<core::result::Result<T,E> as core::ops::try_trait::Try>::branch (1 samples, 0.38%)<deduplicated_symbol> (3 samples, 1.13%)_platform_memmove (1 samples, 0.38%)_xzm_free (1 samples, 0.38%)_xzm_xzone_malloc (1 samples, 0.38%)_xzm_xzone_malloc_tiny (4 samples, 1.51%)_malloc_zone_realloc (16 samples, 6.04%)_malloc_..xzm_realloc (6 samples, 2.26%)x..mach_absolute_time (3 samples, 1.13%)xzm_malloc_zone_size (4 samples, 1.51%)alloc::raw_vec::RawVecInner<A>::reserve (22 samples, 8.30%)alloc::raw_v..alloc::raw_vec::RawVecInner<A>::grow_amortized (21 samples, 7.92%)alloc::raw_..std::sys::alloc::unix::_<impl core::alloc::global::GlobalAlloc for std::alloc::System>::realloc (21 samples, 7.92%)std::sys::a.._realloc (21 samples, 7.92%)_reallocxzm_realloc (1 samples, 0.38%)core::fmt::Formatter::write_str (31 samples, 11.70%)core::fmt::Format..core::ptr::copy_nonoverlapping (1 samples, 0.38%)DYLD-STUB$$memcpy (1 samples, 0.38%)core::fmt::builders::DebugList::entry::_{{closure}} (1 samples, 0.38%)core::fmt::Formatter::pad_integral (1 samples, 0.38%)<core::result::Result<T,E> as core::ops::try_trait::Try>::branch (1 samples, 0.38%)_platform_memmove (1 samples, 0.38%)alloc::raw_vec::RawVecInner<A>::capacity (1 samples, 0.38%)alloc::vec::Vec<T,A>::append_elements (1 samples, 0.38%)core::fmt::Formatter::pad_integral (5 samples, 1.89%)c..core::fmt::Formatter::pad_integral::write_prefix (1 samples, 0.38%)core::fmt::num::imp::_<impl core::fmt::Display for u64>::fmt (13 samples, 4.91%)core::..core::fmt::Formatter::pad_integral (2 samples, 0.75%)core::fmt::Formatter::pad_integral::write_prefix (2 samples, 0.75%)core::fmt::rt::Argument::fmt (79 samples, 29.81%)core::fmt::rt::Argument::fmtcore::str::traits::_<impl core::slice::index::SliceIndex<str> for core::ops::range::Range<usize>>::get (1 samples, 0.38%)_platform_memmove (10 samples, 3.77%)_pla..alloc::raw_vec::RawVecInner<A>::capacity (2 samples, 0.75%)alloc::vec::Vec<T,A>::append_elements (3 samples, 1.13%)<&mut W as core::fmt::Write::write_fmt::SpecWriteFmt>::spec_write_fmt (111 samples, 41.89%)<&mut W as core::fmt::Write::write_fmt::SpecWriteFmt>::spec_write_fmtcore::fmt::write (25 samples, 9.43%)core::fmt::wr..core::ptr::copy_nonoverlapping (4 samples, 1.51%)DYLD-STUB$$memcpy (4 samples, 1.51%)<deduplicated_symbol> (4 samples, 1.51%)_malloc_zone_malloc (7 samples, 2.64%)_m.._xzm_xzone_malloc (2 samples, 0.75%)_xzm_xzone_malloc_tiny (17 samples, 6.42%)_xzm_xzo..alloc::fmt::format::format_inner (2 samples, 0.75%)alloc::raw_vec::RawVecInner<A>::try_allocate_in (1 samples, 0.38%)core::fmt::Arguments::estimated_capacity (1 samples, 0.38%)malloc (1 samples, 0.38%)alloc::fmt::format::_{{closure}} (147 samples, 55.47%)alloc::fmt::format::_{{closure}}xzm_malloc_zone_malloc_type_malloc (1 samples, 0.38%)alloc::fmt::format::format_inner (4 samples, 1.51%)alloc::raw_vec::RawVecInner<A>::current_memory (1 samples, 0.38%)alloc::vec::Vec<T,A>::push_mut (1 samples, 0.38%)core::hint::must_use (2 samples, 0.75%)dexpr::ast::value::Value::deserialize (1 samples, 0.38%)dexpr::bytecode::BytecodeReader::read_byte (4 samples, 1.51%)dexpr::opcodes::OpCodeByte::name (3 samples, 1.13%)dexpr::vm::vm::VM::compare_op (1 samples, 0.38%)DYLD-STUB$$_platform_bzero (1 samples, 0.38%)DYLD-STUB$$mach_absolute_time (1 samples, 0.38%)_platform_memset (4 samples, 1.51%)_xzm_free (8 samples, 3.02%)_xz..dexpr::vm::vm::VM::execute (28 samples, 10.57%)dexpr::vm::vm::..mach_absolute_time (11 samples, 4.15%)mach_..dexpr::vm::vm::VM::handle_load_const (2 samples, 0.75%)_platform_memmove (1 samples, 0.38%)core::ptr::drop_in_place<[dexpr::ast::value::Value (2 samples, 0.75%) 16]> (2 samples, 0.75%)core::ptr::drop_in_place<dexpr::ast::value::Value> (2 samples, 0.75%)dexpr::vm::vm::VM::handle_return (4 samples, 1.51%)core::ptr::drop_in_place<dexpr::ast::value::Value> (1 samples, 0.38%)dexpr::vm::vm::VM::read_jump_address (1 samples, 0.38%)dexpr::bytecode::BytecodeReader::read_u32 (1 samples, 0.38%)rust_decimal::ops::add::add_impl (1 samples, 0.38%)rust_decimal::ops::add::add_sub_internal (1 samples, 0.38%)rust_decimal::ops::add::sub_impl (1 samples, 0.38%)rust_decimal::ops::add::add_sub_internal (1 samples, 0.38%)DYLD-STUB$$free (1 samples, 0.38%)__bzero (2 samples, 0.75%)_platform_memset (4 samples, 1.51%)_xzm_free (15 samples, 5.66%)_xzm_fr..all (265 samples, 100%)start (265 samples, 100.00%)startmain (264 samples, 99.62%)maincore::ops::function::FnOnce::call_once (264 samples, 99.62%)core::ops::function::FnOnce::call_oncedexpr::main (264 samples, 99.62%)dexpr::mainstd::sys::alloc::unix::_<impl core::alloc::global::GlobalAlloc for std::alloc::System>::dealloc (43 samples, 16.23%)std::sys::alloc::unix::_<..mach_absolute_time (21 samples, 7.92%)mach_absolu..
\ No newline at end of file
diff --git a/gen.js b/gen.js
new file mode 100644
index 0000000..6f1c83b
--- /dev/null
+++ b/gen.js
@@ -0,0 +1,74 @@
+function randomBetween(min, max) {
+  min = Math.round(min);
+  max = Math.round(max);
+  return Math.floor(Math.random() * (max - min + 1) + min);
+}
+
+function shuffleArray(array) {
+  for (let i = array.length - 1; i > 0; i--) {
+    const j = Math.floor(Math.random() * (i + 1));
+    [array[i], array[j]] = [array[j], array[i]];
+  }
+}
+
+function generateRandomArithmeticExpression() {
+  const operators = ['+', '-', '*', '/']; // Array of arithmetic operators
+  const maxDecimalPlaces = 5;
+  const numOperands = randomBetween(10, 20);
+  const numParentheses = randomBetween(4, 8);
+
+  // Generate random numbers with two decimal places
+  let nums = [];
+  for (let i = 0; i < numOperands; i++) {
+    nums.push((Math.random() * 100).toFixed(randomBetween(1, maxDecimalPlaces)));
+  }
+
+  let res = [];
+
+  shuffleArray(nums);
+
+  let numRemainingOperands = nums.length;
+  let openParentheses = 0;
+
+  for (let i = 0; i < nums.length; i++) {
+    // Open a parenthesis if there are enough operands remaining
+    if (openParentheses < numParentheses && numRemainingOperands > 1 && Math.random() < 0.5) {
+      res.push('(');
+      openParentheses++;
+    }
+
+    res.push(nums[i]);
+
+    // Close a parenthesis if there are enough operands preceding it
+    if (openParentheses > 0 && numRemainingOperands > 2 && Math.random() < 0.5) {
+      res.push(')');
+      openParentheses--;
+    }
+
+    if (i < nums.length - 1) {
+      res.push(operators[randomBetween(0, 3)]);
+    }
+
+    numRemainingOperands--;
+  }
+
+  // Close any remaining open parentheses
+  while (openParentheses > 0) {
+    res.push(')');
+    openParentheses--;
+  }
+
+  return res.join('');
+}
+
+let res = '';
+
+for (let i = 0; i < 100; i++) {
+  let expr = generateRandomArithmeticExpression();
+  let val = eval(expr);
+
+  // res += `("${expr}", "${val}"),\n`;
+  res += `"${expr}",\n`;
+}
+
+console.log(res);
diff --git a/justfile b/justfile
new file mode 100644
index 0000000..449a090
--- /dev/null
+++ b/justfile
@@ -0,0 +1,48 @@
+# dexpr build recipes
+
+# Run all tests
+test:
+    cargo test
+
+# Run benchmarks
+bench:
+    cargo bench --bench my_benchmark
+
+# Run the main program
+run:
+    cargo run --release
+
+# --- WASM ---
+
+# Build wasm package (web target)
+wasm:
+    cd wasm && wasm-pack build --target web --release
+
+# Build wasm package (bundler target, for npm)
+wasm-bundler:
+    cd wasm && wasm-pack build --target bundler --release
+
+# --- Editor ---
+
+# Generate Lezer parser from grammar
+editor-grammar:
+    cd editor && npx @lezer/generator src/dexpr.grammar -o src/parser.js
+
+# Build editor package (CodeMirror language support)
+editor-build: editor-grammar
+    cd editor && bun run build
+
+# Build editor demo page
+editor-demo: editor-build
+    cd editor && bun run demo
+
+# --- Combined ---
+
+# Build everything (wasm + editor)
+build-all: wasm editor-build
+
+# Clean all build artifacts
+clean:
+    cargo clean
+    rm -rf wasm/pkg wasm/target
+    rm -rf editor/dist
diff --git a/profile.json.gz b/profile.json.gz
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HcmV?d00001

diff --git a/rustfmt.toml b/rustfmt.toml
new file mode 100644
index 0000000..6f2e075
--- /dev/null
+++ b/rustfmt.toml
@@ -0,0 +1 @@
+tab_spaces = 2
\ No newline at end of file
diff --git a/src/ast/expr.rs b/src/ast/expr.rs
new file mode 100644
index 0000000..3e14280
--- /dev/null
+++ b/src/ast/expr.rs
@@ -0,0 +1,77 @@
+use super::value::Value;
+use smol_str::SmolStr;
+
+/// Source code location for error reporting
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
+pub struct Span {
+  pub line: u32,
+  pub column: u32,
+}
+
+impl Span {
+  pub fn new(line: u32, column: u32) -> Self {
+    Self { line, column }
+  }
+}
+
+impl std::fmt::Display for Span {
+  fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+    write!(f, "line {}, column {}", self.line, self.column)
+  }
+}
+
+/// Wrapper that associates a value with its source location
+#[derive(Debug, Clone, PartialEq)]
+pub struct Spanned {
+  pub node: T,
+  pub span: Span,
+}
+
+impl Spanned {
+  pub fn new(node: T, span: Span) -> Self {
+    Self { node, span }
+  }
+
+  pub fn dummy(node: T) -> Self {
+    Self {
+      node,
+      span: Span::default(),
+    }
+  }
+}
+
+#[derive(Debug, Clone, PartialEq)]
+pub enum Expr {
+  Value(Value),
+  Variable(SmolStr),
+  BinaryOp(Box, Op, Box),
+  UnaryOp(Op, Box),
+  FunctionCall(SmolStr, Vec),
+  MethodCall(Box, SmolStr, Vec),
+  PropertyAccess(Box, SmolStr),
+}
+
+/// Expression with source location
+pub type SpannedExpr = Spanned;
+
+#[derive(Debug, Clone, PartialEq)]
+pub enum Op {
+  Add,
+  Sub,
+  Mul,
+  Div,
+  Mod, // Modulo
+  Pow, // Power
+  Lt,
+  Lte,
+  Gt,
+  Gte,
+  Eq,
+  Neq,
+  Neg,
+  And,
+  Or,
+  Not,
+  In, // Membership test (value in list/string)
+
+}
diff --git a/src/ast/mod.rs b/src/ast/mod.rs
new file mode 100644
index 0000000..0f5bda5
--- /dev/null
+++ b/src/ast/mod.rs
@@ -0,0 +1,3 @@
+pub mod expr;
+pub mod stmt;
+pub mod value;
\ No newline at end of file
diff --git a/src/ast/stmt.rs b/src/ast/stmt.rs
new file mode 100644
index 0000000..b73eeab
--- /dev/null
+++ b/src/ast/stmt.rs
@@ -0,0 +1,16 @@
+use smol_str::SmolStr;
+
+use super::expr::{Expr, Spanned};
+
+#[derive(Debug, PartialEq, Clone)]
+pub enum Stmt {
+  Assignment(SmolStr, Box),
+  /// Property assignment: root variable, field path, value
+  /// e.g. `a.b.c = 5` → PropertyAssignment("a", ["b", "c"], 5)
+  PropertyAssignment(SmolStr, Vec, Box),
+  ExprStmt(Box),
+  If(Box, Vec, Option>),
+}
+
+/// Statement with source location
+pub type SpannedStmt = Spanned;
\ No newline at end of file
diff --git a/src/ast/value.rs b/src/ast/value.rs
new file mode 100644
index 0000000..652e961
--- /dev/null
+++ b/src/ast/value.rs
@@ -0,0 +1,440 @@
+use indexmap::IndexMap;
+use rust_decimal::Decimal;
+use smol_str::SmolStr;
+use std::fmt;
+
+/// Value type for the dExpr language
+#[derive(Debug, Clone, PartialEq, Default)]
+pub enum Value {
+  #[default]
+  Null,
+  Number(Decimal),
+  String(SmolStr),
+  Boolean(bool),
+  NumberList(Vec),
+  StringList(Vec),
+  Object(IndexMap),
+}
+
+/// Type tag constants for serialization
+pub const TYPE_NULL: u8 = 0x00;
+pub const TYPE_NUMBER: u8 = 0x01;
+pub const TYPE_STRING: u8 = 0x02;
+pub const TYPE_BOOLEAN: u8 = 0x03;
+pub const TYPE_NUMBER_LIST: u8 = 0x04;
+pub const TYPE_STRING_LIST: u8 = 0x05;
+pub const TYPE_OBJECT: u8 = 0x06;
+
+impl fmt::Display for Value {
+  fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+    match self {
+      Value::Null => write!(f, "null"),
+      Value::Number(n) => write!(f, "{}", n),
+      Value::String(s) => write!(f, "\"{}\"", s),
+      Value::Boolean(b) => write!(f, "{}", b),
+      Value::NumberList(list) => {
+        write!(f, "[")?;
+        for (i, val) in list.iter().enumerate() {
+          if i > 0 {
+            write!(f, ", ")?;
+          }
+          write!(f, "{}", val)?;
+        }
+        write!(f, "]")
+      }
+      Value::StringList(list) => {
+        write!(f, "[")?;
+        for (i, val) in list.iter().enumerate() {
+          if i > 0 {
+            write!(f, ", ")?;
+          }
+          write!(f, "\"{}\"", val)?;
+        }
+        write!(f, "]")
+      }
+      Value::Object(map) => {
+        write!(f, "{{")?;
+        for (i, (key, val)) in map.iter().enumerate() {
+          if i > 0 {
+            write!(f, ", ")?;
+          }
+          write!(f, "{}: {}", key, val)?;
+        }
+        write!(f, "}}")
+      }
+    }
+  }
+}
+
+impl Value {
+  /// Get the type tag for bytecode serialization
+  pub fn type_tag(&self) -> u8 {
+    match self {
+      Value::Null => TYPE_NULL,
+      Value::Number(_) => TYPE_NUMBER,
+      Value::String(_) => TYPE_STRING,
+      Value::Boolean(_) => TYPE_BOOLEAN,
+      Value::NumberList(_) => TYPE_NUMBER_LIST,
+      Value::StringList(_) => TYPE_STRING_LIST,
+      Value::Object(_) => TYPE_OBJECT,
+    }
+  }
+
+  /// Get the type name as a string (for error messages)
+  pub fn type_name(&self) -> &'static str {
+    match self {
+      Value::Null => "Null",
+      Value::Number(_) => "Number",
+      Value::String(_) => "String",
+      Value::Boolean(_) => "Boolean",
+      Value::NumberList(_) => "NumberList",
+      Value::StringList(_) => "StringList",
+      Value::Object(_) => "Object",
+    }
+  }
+
+  /// Serialize the value to bytes for bytecode
+  pub fn serialize(&self) -> Vec {
+    let mut bytes = Vec::new();
+    bytes.push(self.type_tag());
+
+    match self {
+      Value::Null => {
+        // No additional data for null
+      }
+      Value::Number(n) => {
+        bytes.extend_from_slice(&n.serialize());
+      }
+      Value::String(s) => {
+        // String length (2 bytes)
+        bytes.push((s.len() >> 8) as u8);
+        bytes.push(s.len() as u8);
+        // String data
+        bytes.extend_from_slice(s.as_bytes());
+      }
+      Value::Boolean(b) => {
+        bytes.push(if *b { 1 } else { 0 });
+      }
+      Value::NumberList(list) => {
+        // List length (2 bytes)
+        bytes.push((list.len() >> 8) as u8);
+        bytes.push(list.len() as u8);
+        // List items
+        for n in list {
+          bytes.extend_from_slice(&n.serialize());
+        }
+      }
+      Value::StringList(list) => {
+        // List length (2 bytes)
+        bytes.push((list.len() >> 8) as u8);
+        bytes.push(list.len() as u8);
+        // List items
+        for s in list {
+          // String length (2 bytes)
+          bytes.push((s.len() >> 8) as u8);
+          bytes.push(s.len() as u8);
+          // String data
+          bytes.extend_from_slice(s.as_bytes());
+        }
+      }
+      Value::Object(map) => {
+        // Entry count (2 bytes)
+        bytes.push((map.len() >> 8) as u8);
+        bytes.push(map.len() as u8);
+        // Entries: key (string) + value (recursive)
+        for (key, val) in map {
+          bytes.push((key.len() >> 8) as u8);
+          bytes.push(key.len() as u8);
+          bytes.extend_from_slice(key.as_bytes());
+          bytes.extend_from_slice(&val.serialize());
+        }
+      }
+    }
+
+    bytes
+  }
+
+  pub fn is_null(&self) -> bool {
+    matches!(self, Value::Null)
+  }
+}
+
+impl From for Value {
+  fn from(n: Decimal) -> Self {
+    Value::Number(n)
+  }
+}
+
+impl From for Value {
+  fn from(n: i64) -> Self {
+    Value::Number(Decimal::from(n))
+  }
+}
+
+impl From for Value {
+  fn from(n: i32) -> Self {
+    Value::Number(Decimal::from(n))
+  }
+}
+
+impl From for Value {
+  fn from(n: f64) -> Self {
+    Value::Number(Decimal::try_from(n).unwrap_or_default())
+  }
+}
+
+impl From for Value {
+  fn from(b: bool) -> Self {
+    Value::Boolean(b)
+  }
+}
+
+impl From<&str> for Value {
+  fn from(s: &str) -> Self {
+    Value::String(SmolStr::new(s))
+  }
+}
+
+impl From for Value {
+  fn from(s: String) -> Self {
+    Value::String(SmolStr::new(&s))
+  }
+}
+
+impl From for Value {
+  fn from(s: SmolStr) -> Self {
+    Value::String(s)
+  }
+}
+
+impl From> for Value {
+  fn from(v: Vec) -> Self {
+    Value::NumberList(v)
+  }
+}
+
+impl From> for Value {
+  fn from(v: Vec) -> Self {
+    Value::StringList(v)
+  }
+}
+
+impl From> for Value {
+  fn from(m: IndexMap) -> Self {
+    Value::Object(m)
+  }
+}
+
+impl Value {
+  /// Deserialize a value from bytes
+  pub fn deserialize(bytes: &[u8]) -> Result<(Value, usize), String> {
+    if bytes.is_empty() {
+      return Err("Empty buffer".to_string());
+    }
+
+    let type_tag = bytes[0];
+    let mut pos = 1;
+
+    match type_tag {
+      TYPE_NULL => Ok((Value::Null, pos)),
+      TYPE_NUMBER => {
+        if bytes.len() < pos + 16 {
+          return Err("Insufficient bytes for Number".to_string());
+        }
+        let mut decimal_bytes = [0u8; 16];
+        decimal_bytes.copy_from_slice(&bytes[pos..pos + 16]);
+        pos += 16;
+        Ok((Value::Number(Decimal::deserialize(decimal_bytes)), pos))
+      }
+      TYPE_STRING => {
+        if bytes.len() < pos + 2 {
+          return Err("Insufficient bytes for String length".to_string());
+        }
+        let len = u16::from_be_bytes([bytes[pos], bytes[pos + 1]]) as usize;
+        pos += 2;
+
+        if bytes.len() < pos + len {
+          return Err("Insufficient bytes for String data".to_string());
+        }
+        let s = match std::str::from_utf8(&bytes[pos..pos + len]) {
+          Ok(s) => s,
+          Err(_) => return Err("Invalid UTF-8 in String".to_string()),
+        };
+        pos += len;
+
+        Ok((Value::String(s.into()), pos))
+      }
+      TYPE_BOOLEAN => {
+        if bytes.len() < pos + 1 {
+          return Err("Insufficient bytes for Boolean".to_string());
+        }
+        let b = bytes[pos] != 0;
+        pos += 1;
+        Ok((Value::Boolean(b), pos))
+      }
+      TYPE_NUMBER_LIST => {
+        if bytes.len() < pos + 2 {
+          return Err("Insufficient bytes for NumberList length".to_string());
+        }
+        let len = u16::from_be_bytes([bytes[pos], bytes[pos + 1]]) as usize;
+        pos += 2;
+
+        let total_bytes = len * 16;
+        if bytes.len() < pos + total_bytes {
+          return Err("Insufficient bytes for NumberList items".to_string());
+        }
+
+        let mut list = Vec::with_capacity(len);
+        for _ in 0..len {
+          let mut decimal_bytes = [0u8; 16];
+          decimal_bytes.copy_from_slice(&bytes[pos..pos + 16]);
+          pos += 16;
+          list.push(Decimal::deserialize(decimal_bytes));
+        }
+
+        Ok((Value::NumberList(list), pos))
+      }
+      TYPE_STRING_LIST => {
+        if bytes.len() < pos + 2 {
+          return Err("Insufficient bytes for StringList length".to_string());
+        }
+        let len = u16::from_be_bytes([bytes[pos], bytes[pos + 1]]) as usize;
+        pos += 2;
+
+        let mut list = Vec::with_capacity(len);
+        for _ in 0..len {
+          if bytes.len() < pos + 2 {
+            return Err("Insufficient bytes for StringList item length".to_string());
+          }
+          let str_len = u16::from_be_bytes([bytes[pos], bytes[pos + 1]]) as usize;
+          pos += 2;
+
+          if bytes.len() < pos + str_len {
+            return Err("Insufficient bytes for StringList item data".to_string());
+          }
+          let s = match std::str::from_utf8(&bytes[pos..pos + str_len]) {
+            Ok(s) => s,
+            Err(_) => return Err("Invalid UTF-8 in StringList item".to_string()),
+          };
+          pos += str_len;
+
+          list.push(s.into());
+        }
+
+        Ok((Value::StringList(list), pos))
+      }
+      TYPE_OBJECT => {
+        if bytes.len() < pos + 2 {
+          return Err("Insufficient bytes for Object length".to_string());
+        }
+        let len = u16::from_be_bytes([bytes[pos], bytes[pos + 1]]) as usize;
+        pos += 2;
+
+        let mut map = IndexMap::with_capacity(len);
+        for _ in 0..len {
+          // Read key
+          if bytes.len() < pos + 2 {
+            return Err("Insufficient bytes for Object key length".to_string());
+          }
+          let key_len = u16::from_be_bytes([bytes[pos], bytes[pos + 1]]) as usize;
+          pos += 2;
+          if bytes.len() < pos + key_len {
+            return Err("Insufficient bytes for Object key data".to_string());
+          }
+          let key = match std::str::from_utf8(&bytes[pos..pos + key_len]) {
+            Ok(s) => s,
+            Err(_) => return Err("Invalid UTF-8 in Object key".to_string()),
+          };
+          pos += key_len;
+
+          // Read value (recursive)
+          let (val, val_bytes) = Value::deserialize(&bytes[pos..])?;
+          pos += val_bytes;
+
+          map.insert(key.into(), val);
+        }
+
+        Ok((Value::Object(map), pos))
+      }
+      _ => Err(format!("Unknown type tag: {}", type_tag)),
+    }
+  }
+
+  /// Create a Value from a JSON string.
+  ///
+  /// Mapping:
+  /// - `null` → `Null`
+  /// - `true`/`false` → `Boolean`
+  /// - number → `Number` (Decimal)
+  /// - string → `String`
+  /// - array of numbers → `NumberList`
+  /// - array of strings → `StringList`
+  /// - object → `Object` (recursive)
+  ///
+  /// ```
+  /// use dexpr::ast::value::Value;
+  /// use rust_decimal_macros::dec;
+  ///
+  /// let val = Value::from_json(r#"{"name": "Alice", "age": 30}"#).unwrap();
+  /// if let Value::Object(map) = &val {
+  ///     assert_eq!(map.get("name").unwrap(), &Value::String("Alice".into()));
+  ///     assert_eq!(map.get("age").unwrap(), &Value::Number(dec!(30)));
+  /// }
+  /// ```
+  pub fn from_json(json: &str) -> Result {
+    let v: serde_json::Value = serde_json::from_str(json)
+      .map_err(|e| format!("JSON parse error: {}", e))?;
+    Self::from_json_value(&v)
+  }
+
+  /// Convert a serde_json::Value to a dexpr Value.
+  pub fn from_json_value(v: &serde_json::Value) -> Result {
+    match v {
+      serde_json::Value::Null => Ok(Value::Null),
+      serde_json::Value::Bool(b) => Ok(Value::Boolean(*b)),
+      serde_json::Value::Number(n) => {
+        // Try integer first, then float
+        if let Some(i) = n.as_i64() {
+          Ok(Value::Number(Decimal::from(i)))
+        } else if let Some(f) = n.as_f64() {
+          Decimal::try_from(f)
+            .map(Value::Number)
+            .map_err(|e| format!("Cannot convert {} to Decimal: {}", f, e))
+        } else {
+          Err(format!("Unsupported JSON number: {}", n))
+        }
+      }
+      serde_json::Value::String(s) => Ok(Value::String(SmolStr::new(s))),
+      serde_json::Value::Array(arr) => {
+        if arr.is_empty() {
+          return Ok(Value::StringList(Vec::new()));
+        }
+        // Check if all elements are the same type
+        let first = &arr[0];
+        if first.is_number() && arr.iter().all(|v| v.is_number()) {
+          let mut nums = Vec::with_capacity(arr.len());
+          for item in arr {
+            if let Value::Number(n) = Self::from_json_value(item)? {
+              nums.push(n);
+            }
+          }
+          Ok(Value::NumberList(nums))
+        } else if first.is_string() && arr.iter().all(|v| v.is_string()) {
+          let strings: Vec = arr.iter()
+            .filter_map(|v| v.as_str().map(SmolStr::new))
+            .collect();
+          Ok(Value::StringList(strings))
+        } else {
+          Err("Arrays must contain all numbers or all strings".to_string())
+        }
+      }
+      serde_json::Value::Object(obj) => {
+        let mut map = IndexMap::with_capacity(obj.len());
+        for (k, v) in obj {
+          map.insert(SmolStr::new(k), Self::from_json_value(v)?);
+        }
+        Ok(Value::Object(map))
+      }
+    }
+  }
+}
diff --git a/src/basic_long.dexpr b/src/basic_long.dexpr
new file mode 100644
index 0000000..582ba1b
--- /dev/null
+++ b/src/basic_long.dexpr
@@ -0,0 +1,10 @@
+a = 10.2
+b = a + 5.5
+c = 2.4
+
+d = b + c
+
+f = (3+3)*2/3
+
+t = 3+3
+g = t*2/3 + test
\ No newline at end of file
diff --git a/src/bench_long.dexpr b/src/bench_long.dexpr
new file mode 100644
index 0000000..a37f536
--- /dev/null
+++ b/src/bench_long.dexpr
@@ -0,0 +1,28 @@
+a = 10.2
+b = a + 5.5
+c = 2.4
+
+d = b + c
+
+"Merhaba" + " duhan".upper()
+
+(3+3)*2/3
+
+t = 3+3
+t*2/3
+
+if true then
+	"true"
+else
+	"false"
+end
+
+aaa = false
+
+if false && true then
+	"11"
+else if 2 > 1 && 2 >= 2 && !aaa then
+	"22"
+else if true then
+	"33"
+end
\ No newline at end of file
diff --git a/src/bench_sample.dexpr b/src/bench_sample.dexpr
new file mode 100644
index 0000000..ddb58e6
--- /dev/null
+++ b/src/bench_sample.dexpr
@@ -0,0 +1,10 @@
+a = 10.2
+b = a + 5.5
+c = 2.4
+
+d = b + c
+
+f = (3+3)*2/3
+
+t = 3+3
+g = t*2/3
\ No newline at end of file
diff --git a/src/bench_sample2.dexpr b/src/bench_sample2.dexpr
new file mode 100644
index 0000000..ddb58e6
--- /dev/null
+++ b/src/bench_sample2.dexpr
@@ -0,0 +1,10 @@
+a = 10.2
+b = a + 5.5
+c = 2.4
+
+d = b + c
+
+f = (3+3)*2/3
+
+t = 3+3
+g = t*2/3
\ No newline at end of file
diff --git a/src/bytecode.rs b/src/bytecode.rs
new file mode 100644
index 0000000..f956cd2
--- /dev/null
+++ b/src/bytecode.rs
@@ -0,0 +1,177 @@
+use smol_str::SmolStr;
+
+use crate::ast::value::Value;
+
+/// Bytecode writer for generating VM bytecode
+#[derive(Debug, Clone)]
+pub struct BytecodeWriter {
+  buffer: Vec,
+}
+
+impl BytecodeWriter {
+  /// Create a new bytecode writer
+  pub fn new() -> Self {
+    Self { buffer: Vec::new() }
+  }
+
+  /// Write a single byte
+  pub fn write_byte(&mut self, byte: u8) {
+    self.buffer.push(byte);
+  }
+
+  /// Write a 16-bit unsigned integer
+  pub fn write_u16(&mut self, value: u16) {
+    self.buffer.push((value >> 8) as u8);
+    self.buffer.push(value as u8);
+  }
+
+  /// Write a 32-bit unsigned integer
+  pub fn write_u32(&mut self, value: u32) {
+    self.buffer.push((value >> 24) as u8);
+    self.buffer.push((value >> 16) as u8);
+    self.buffer.push((value >> 8) as u8);
+    self.buffer.push(value as u8);
+  }
+
+  /// Write a register
+  pub fn write_register(&mut self, reg: u8) {
+    self.buffer.push(reg);
+  }
+
+  /// Write a string
+  pub fn write_string(&mut self, s: &SmolStr) {
+    // String length (2 bytes)
+    self.write_u16(s.len() as u16);
+    // String data
+    self.buffer.extend_from_slice(s.as_bytes());
+  }
+
+  /// Write a value
+  pub fn write_value(&mut self, value: &Value) {
+    self.buffer.extend_from_slice(&value.serialize());
+  }
+
+  /// Get the current position
+  pub fn position(&self) -> usize {
+    self.buffer.len()
+  }
+
+  /// Get the bytecode buffer
+  pub fn bytecode(&self) -> &[u8] {
+    &self.buffer
+  }
+
+  /// Consume the writer and return the bytecode
+  pub fn into_bytecode(self) -> Vec {
+    self.buffer
+  }
+}
+
+/// Bytecode reader for parsing VM bytecode
+pub struct BytecodeReader<'a> {
+  bytecode: &'a [u8],
+  position: usize,
+}
+
+impl<'a> BytecodeReader<'a> {
+  /// Create a new bytecode reader
+  pub fn new(bytecode: &'a [u8]) -> Self {
+    Self {
+      bytecode,
+      position: 0,
+    }
+  }
+
+  /// Read a single byte
+  #[inline(always)]
+  pub fn read_byte(&mut self) -> Result {
+    if self.position >= self.bytecode.len() {
+      return Err("Unexpected end of bytecode".to_string());
+    }
+
+    let byte = self.bytecode[self.position];
+    self.position += 1;
+    Ok(byte)
+  }
+
+  /// Read a 16-bit unsigned integer
+  pub fn read_u16(&mut self) -> Result {
+    if self.position + 1 >= self.bytecode.len() {
+      return Err("Unexpected end of bytecode".to_string());
+    }
+
+    let value =
+      ((self.bytecode[self.position] as u16) << 8) | (self.bytecode[self.position + 1] as u16);
+    self.position += 2;
+    Ok(value)
+  }
+
+  /// Read a 32-bit unsigned integer
+  pub fn read_u32(&mut self) -> Result {
+    if self.position + 3 >= self.bytecode.len() {
+      return Err("Unexpected end of bytecode".to_string());
+    }
+
+    let value = ((self.bytecode[self.position] as u32) << 24)
+      | ((self.bytecode[self.position + 1] as u32) << 16)
+      | ((self.bytecode[self.position + 2] as u32) << 8)
+      | (self.bytecode[self.position + 3] as u32);
+    self.position += 4;
+    Ok(value)
+  }
+
+  /// Read a register
+  #[inline(always)]
+  pub fn read_register(&mut self) -> Result {
+    self.read_byte()
+  }
+
+  /// Read a string
+  #[inline(always)]
+  pub fn read_string(&mut self) -> Result {
+    let length = self.read_u16()? as usize;
+
+    if self.position + length > self.bytecode.len() {
+      return Err("Unexpected end of bytecode".to_string());
+    }
+
+    let s = std::str::from_utf8(&self.bytecode[self.position..self.position + length])
+      .map_err(|_| "Invalid UTF-8 string".to_string())?;
+    self.position += length;
+
+    Ok(s.into())
+  }
+
+  /// Read a value
+  pub fn read_value(&mut self) -> Result {
+    if self.position >= self.bytecode.len() {
+      return Err("Unexpected end of bytecode".to_string());
+    }
+
+    let (value, bytes_read) = Value::deserialize(&self.bytecode[self.position..])?;
+    self.position += bytes_read;
+
+    Ok(value)
+  }
+
+  /// Get the current position
+  pub fn position(&self) -> usize {
+    self.position
+  }
+
+  /// Set the position
+  pub fn set_position(&mut self, position: usize) -> Result<(), String> {
+    if position > self.bytecode.len() {
+      return Err("Position out of range".to_string());
+    }
+
+    self.position = position;
+    Ok(())
+  }
+
+  /// Get the remaining bytes
+  #[inline(always)]
+  pub fn remaining(&self) -> usize {
+    self.bytecode.len() - self.position
+  }
+}
diff --git a/src/bytecode_dump.rs b/src/bytecode_dump.rs
new file mode 100644
index 0000000..9a5a176
--- /dev/null
+++ b/src/bytecode_dump.rs
@@ -0,0 +1,234 @@
+use crate::bytecode::BytecodeReader;
+use crate::opcodes::OpCodeByte;
+
+/// A utility function to disassemble bytecode for debugging
+pub fn disassemble_bytecode(bytecode: &[u8]) -> Vec {
+  let mut result = Vec::new();
+  let mut reader = BytecodeReader::new(bytecode);
+
+  while reader.remaining() > 0 {
+    let start_position = reader.position();
+    let opcode_byte = match reader.read_byte() {
+      Ok(b) => b,
+      Err(_) => break,
+    };
+
+    let opcode = match OpCodeByte::from_byte(opcode_byte) {
+      Some(op) => op,
+      None => {
+        result.push(format!(
+          "{:04x}: Unknown opcode: 0x{:02x}",
+          start_position, opcode_byte
+        ));
+        continue;
+      }
+    };
+
+    let instruction = match opcode {
+      OpCodeByte::LoadConst => {
+        let reg = reader.read_byte();
+        let value = reader.read_value();
+        match (reg, value) {
+          (Ok(r), Ok(v)) => format!("{:04x}: LoadConst r{}, {}", start_position, r, v),
+          _ => format!("{:04x}: LoadConst (truncated)", start_position),
+        }
+      }
+      OpCodeByte::Move => {
+        let dest = reader.read_byte();
+        let src = reader.read_byte();
+        match (dest, src) {
+          (Ok(d), Ok(s)) => format!("{:04x}: Move r{} = r{}", start_position, d, s),
+          _ => format!("{:04x}: Move (truncated)", start_position),
+        }
+      }
+      OpCodeByte::LoadLocal => {
+        let reg = reader.read_byte();
+        let offset = reader.read_byte();
+        match (reg, offset) {
+          (Ok(r), Ok(o)) => format!("{:04x}: LoadLocal r{}, offset={}", start_position, r, o),
+          _ => format!("{:04x}: LoadLocal (truncated)", start_position),
+        }
+      }
+      OpCodeByte::StoreLocal => {
+        let offset = reader.read_byte();
+        let reg = reader.read_byte();
+        match (offset, reg) {
+          (Ok(o), Ok(r)) => format!("{:04x}: StoreLocal offset={}, r{}", start_position, o, r),
+          _ => format!("{:04x}: StoreLocal (truncated)", start_position),
+        }
+      }
+      OpCodeByte::LoadGlobal => {
+        let reg = reader.read_byte();
+        let name = reader.read_string();
+        match (reg, name) {
+          (Ok(r), Ok(n)) => format!("{:04x}: LoadGlobal r{}, \"{}\"", start_position, r, n),
+          _ => format!("{:04x}: LoadGlobal (truncated)", start_position),
+        }
+      }
+      OpCodeByte::StoreGlobal => {
+        let name = reader.read_string();
+        let reg = reader.read_byte();
+        match (name, reg) {
+          (Ok(n), Ok(r)) => format!("{:04x}: StoreGlobal \"{}\", r{}", start_position, n, r),
+          _ => format!("{:04x}: StoreGlobal (truncated)", start_position),
+        }
+      }
+      OpCodeByte::Add
+      | OpCodeByte::Sub
+      | OpCodeByte::Mul
+      | OpCodeByte::Div
+      | OpCodeByte::Mod
+      | OpCodeByte::Pow
+      | OpCodeByte::Lt
+      | OpCodeByte::Lte
+      | OpCodeByte::Gt
+      | OpCodeByte::Gte
+      | OpCodeByte::Eq
+      | OpCodeByte::Neq
+      | OpCodeByte::And
+      | OpCodeByte::Or
+      | OpCodeByte::Contains
+      | OpCodeByte::Concat => {
+        let res = reader.read_byte();
+        let left = reader.read_byte();
+        let right = reader.read_byte();
+        match (res, left, right) {
+          (Ok(r), Ok(l), Ok(rg)) => {
+            format!("{:04x}: {:?} r{}, r{}, r{}", start_position, opcode, r, l, rg)
+          }
+          _ => format!("{:04x}: {:?} (truncated)", start_position, opcode),
+        }
+      }
+      OpCodeByte::Neg | OpCodeByte::Not => {
+        let res = reader.read_byte();
+        let operand = reader.read_byte();
+        match (res, operand) {
+          (Ok(r), Ok(o)) => format!("{:04x}: {:?} r{}, r{}", start_position, opcode, r, o),
+          _ => format!("{:04x}: {:?} (truncated)", start_position, opcode),
+        }
+      }
+      OpCodeByte::Jump => match reader.read_u32() {
+        Ok(addr) => format!("{:04x}: Jump -> 0x{:04x}", start_position, addr),
+        Err(_) => format!("{:04x}: Jump (truncated)", start_position),
+      },
+      OpCodeByte::JumpIfFalse => {
+        let reg = reader.read_byte();
+        let addr = reader.read_u32();
+        match (reg, addr) {
+          (Ok(r), Ok(a)) => format!("{:04x}: JumpIfFalse r{} -> 0x{:04x}", start_position, r, a),
+          _ => format!("{:04x}: JumpIfFalse (truncated)", start_position),
+        }
+      }
+      OpCodeByte::MethodCall => {
+        let res = reader.read_byte();
+        let obj = reader.read_byte();
+        let method = reader.read_string();
+        let arg_count = reader.read_byte();
+        match (res, obj, method, arg_count) {
+          (Ok(r), Ok(o), Ok(m), Ok(count)) => {
+            let mut arg_regs = Vec::new();
+            let mut truncated = false;
+            for _ in 0..count {
+              match reader.read_byte() {
+                Ok(reg) => arg_regs.push(format!("r{}", reg)),
+                Err(_) => {
+                  truncated = true;
+                  break;
+                }
+              }
+            }
+            if truncated {
+              format!(
+                "{:04x}: MethodCall r{} = r{}.{}(truncated args)",
+                start_position, r, o, m
+              )
+            } else {
+              format!(
+                "{:04x}: MethodCall r{} = r{}.{}({})",
+                start_position,
+                r,
+                o,
+                m,
+                arg_regs.join(", ")
+              )
+            }
+          }
+          _ => format!("{:04x}: MethodCall (truncated)", start_position),
+        }
+      }
+      OpCodeByte::Log => match reader.read_byte() {
+        Ok(reg) => format!("{:04x}: Log r{}", start_position, reg),
+        Err(_) => format!("{:04x}: Log (truncated)", start_position),
+      },
+      OpCodeByte::CallDefault => {
+        let res = reader.read_byte();
+        let fn_id = reader.read_byte();
+        let arg_count = reader.read_byte();
+        match (res, fn_id, arg_count) {
+          (Ok(r), Ok(id), Ok(count)) => {
+            let fn_name = crate::opcodes::default_fn::name(id).unwrap_or("?");
+            let mut arg_regs = Vec::new();
+            for _ in 0..count {
+              if let Ok(reg) = reader.read_byte() {
+                arg_regs.push(format!("r{}", reg));
+              }
+            }
+            format!(
+              "{:04x}: CallDefault r{} = {}({})",
+              start_position, r, fn_name, arg_regs.join(", ")
+            )
+          }
+          _ => format!("{:04x}: CallDefault (truncated)", start_position),
+        }
+      }
+      OpCodeByte::CallExternal => {
+        let res = reader.read_byte();
+        let name = reader.read_string();
+        let arg_count = reader.read_byte();
+        match (res, name, arg_count) {
+          (Ok(r), Ok(n), Ok(count)) => {
+            let mut arg_regs = Vec::new();
+            for _ in 0..count {
+              if let Ok(reg) = reader.read_byte() {
+                arg_regs.push(format!("r{}", reg));
+              }
+            }
+            format!(
+              "{:04x}: CallExternal r{} = {}({})",
+              start_position, r, n, arg_regs.join(", ")
+            )
+          }
+          _ => format!("{:04x}: CallExternal (truncated)", start_position),
+        }
+      }
+      OpCodeByte::GetProperty => {
+        let dest = reader.read_byte();
+        let obj = reader.read_byte();
+        let prop = reader.read_string();
+        match (dest, obj, prop) {
+          (Ok(d), Ok(o), Ok(p)) => format!("{:04x}: GetProperty r{} = r{}.{}", start_position, d, o, p),
+          _ => format!("{:04x}: GetProperty (truncated)", start_position),
+        }
+      }
+      OpCodeByte::SetProperty => {
+        let obj = reader.read_byte();
+        let prop = reader.read_string();
+        let val = reader.read_byte();
+        match (obj, prop, val) {
+          (Ok(o), Ok(p), Ok(v)) => format!("{:04x}: SetProperty r{}.{} = r{}", start_position, o, p, v),
+          _ => format!("{:04x}: SetProperty (truncated)", start_position),
+        }
+      }
+      OpCodeByte::SetResult => match reader.read_byte() {
+        Ok(reg) => format!("{:04x}: SetResult r{}", start_position, reg),
+        Err(_) => format!("{:04x}: SetResult (truncated)", start_position),
+      },
+      OpCodeByte::End => format!("{:04x}: End", start_position),
+    };
+
+    result.push(instruction);
+  }
+
+  result
+}
+
diff --git a/src/compiler.rs b/src/compiler.rs
new file mode 100644
index 0000000..0b34712
--- /dev/null
+++ b/src/compiler.rs
@@ -0,0 +1,605 @@
+use crate::ast::expr::Span;
+use crate::ast::value::Value;
+use crate::ast::{
+  expr::{Expr, Op},
+  stmt::Stmt,
+};
+use crate::bytecode::BytecodeWriter;
+use crate::opcodes::OpCodeByte;
+use crate::parser::offset_to_span;
+use crate::vm::DebugInfo;
+use smol_str::SmolStr;
+use thiserror::Error;
+
+/// Maximum number of registers
+pub const MAX_REGISTERS: u8 = 8;
+
+/// Compile-time error
+#[derive(Error, Debug)]
+pub enum CompileError {
+  #[error("Undefined function: {0}")]
+  UndefinedFunction(SmolStr),
+
+  #[error("Register limit exceeded")]
+  RegisterLimitExceeded,
+
+  #[error("Invalid expression: {0}")]
+  InvalidExpression(String),
+
+  #[error("Invalid statement: {0}")]
+  InvalidStatement(String),
+
+  #[error("Bytecode error: {0}")]
+  BytecodeError(String),
+}
+
+/// Compiler for dExpr language
+pub struct Compiler {
+  writer: BytecodeWriter,
+  used_registers: Vec,
+  #[cfg(debug_assertions)]
+  debug: bool,
+
+  // Jump address resolution
+  pending_jumps: Vec<(usize, usize)>,
+  labels: HashMap,
+  next_label: usize,
+
+  // Debug info generation
+  debug_info: DebugInfo,
+  current_span: Span,
+}
+
+use std::collections::HashMap;
+
+impl Compiler {
+  /// Create a new compiler
+  pub fn new() -> Self {
+    Self {
+      writer: BytecodeWriter::new(),
+      used_registers: vec![false; MAX_REGISTERS as usize],
+      #[cfg(debug_assertions)]
+      debug: false,
+      pending_jumps: Vec::new(),
+      labels: HashMap::new(),
+      next_label: 0,
+      debug_info: DebugInfo::new(),
+      current_span: Span::default(),
+    }
+  }
+
+  /// Set debug mode
+  #[cfg(debug_assertions)]
+  pub fn set_debug(&mut self, debug: bool) {
+    self.debug = debug;
+  }
+
+  /// Set debug mode (no-op in release)
+  #[cfg(not(debug_assertions))]
+  pub fn set_debug(&mut self, _debug: bool) {}
+
+  /// Update current source span and emit debug info
+  fn set_span(&mut self, span: Span) {
+    if span != self.current_span {
+      self.current_span = span;
+      let offset = self.writer.position() as u32;
+      self.debug_info.add_entry(offset, span);
+    }
+  }
+
+  /// Get the generated debug info
+  pub fn debug_info(&self) -> &DebugInfo {
+    &self.debug_info
+  }
+
+  /// Take the debug info out of the compiler
+  pub fn take_debug_info(&mut self) -> DebugInfo {
+    std::mem::take(&mut self.debug_info)
+  }
+
+  /// Compile AST to bytecode
+  pub fn compile(&mut self, statements: Vec) -> Result, CompileError> {
+    self.reset_compiler_state();
+
+    for stmt in &statements {
+      self.compile_stmt(stmt)?;
+    }
+
+    self.emit_byte(OpCodeByte::End.to_byte());
+    self.resolve_jumps()?;
+
+    Ok(self.writer.clone().into_bytecode())
+  }
+
+  /// Compile source code with debug info for error messages
+  /// Returns (bytecode, debug_info)
+  pub fn compile_from_source(
+    &mut self,
+    source: &str,
+  ) -> Result<(Vec, DebugInfo), CompileError> {
+    use crate::parser;
+
+    // Parse with position info
+    let stmts_with_pos = parser::program_with_spans(source)
+      .map_err(|e| CompileError::InvalidStatement(e.to_string()))?;
+
+    self.reset_compiler_state();
+
+    // Compile statements with span info
+    for (offset, stmt) in &stmts_with_pos {
+      self.set_span(offset_to_span(source, *offset));
+      self.compile_stmt(stmt)?;
+    }
+
+    self.emit_byte(OpCodeByte::End.to_byte());
+    self.resolve_jumps()?;
+
+    let bytecode = self.writer.clone().into_bytecode();
+    Ok((bytecode, self.take_debug_info()))
+  }
+
+  /// Reset all compiler state for a new compilation
+  fn reset_compiler_state(&mut self) {
+    self.writer = BytecodeWriter::new();
+    self.used_registers = vec![false; MAX_REGISTERS as usize];
+    self.pending_jumps.clear();
+    self.labels.clear();
+    self.next_label = 0;
+    self.debug_info = DebugInfo::new();
+    self.current_span = Span::default();
+  }
+
+  /// Compile a statement
+  fn compile_stmt(&mut self, stmt: &Stmt) -> Result<(), CompileError> {
+    match stmt {
+      Stmt::Assignment(name, expr) => self.compile_assignment(name, expr),
+      Stmt::PropertyAssignment(root, path, expr) => self.compile_property_assignment(root, path, expr),
+      Stmt::ExprStmt(expr) => self.compile_expr_stmt(expr),
+      Stmt::If(condition, then_branch, else_branch) => {
+        self.compile_if_statement(condition, then_branch, else_branch)
+      }
+    }
+  }
+
+  /// Compile an assignment statement
+  fn compile_assignment(
+    &mut self,
+    name: &SmolStr,
+    expr: &Expr,
+  ) -> Result<(), CompileError> {
+    let expr_reg = self.compile_expr(expr)?;
+    self.emit_store_global(name, expr_reg);
+    self.free_register(expr_reg);
+    Ok(())
+  }
+
+  /// Emit store to global variable instruction
+  fn emit_store_global(&mut self, name: &SmolStr, reg: u8) {
+    self.emit_byte(OpCodeByte::StoreGlobal.to_byte());
+    self.emit_string(name);
+    self.emit_byte(reg);
+  }
+
+  /// Compile a property assignment: `a.b.c = expr`
+  /// Strategy: load root, get intermediates, set deepest, then set back up the chain, store root.
+  fn compile_property_assignment(
+    &mut self,
+    root: &SmolStr,
+    path: &[SmolStr],
+    expr: &Expr,
+  ) -> Result<(), CompileError> {
+    // Load root object
+    let root_reg = self.allocate_register()?;
+    self.emit_byte(OpCodeByte::LoadGlobal.to_byte());
+    self.emit_byte(root_reg);
+    self.emit_string(root);
+
+    // Get intermediate objects along the path (except last)
+    let mut chain_regs = vec![root_reg];
+    for field in &path[..path.len() - 1] {
+      let next_reg = self.allocate_register()?;
+      self.emit_byte(OpCodeByte::GetProperty.to_byte());
+      self.emit_byte(next_reg);
+      self.emit_byte(*chain_regs.last().unwrap());
+      self.emit_string(field);
+      chain_regs.push(next_reg);
+    }
+
+    // Compile the value expression
+    let val_reg = self.compile_expr(expr)?;
+
+    // Set the deepest property
+    let last_field = &path[path.len() - 1];
+    self.emit_byte(OpCodeByte::SetProperty.to_byte());
+    self.emit_byte(*chain_regs.last().unwrap());
+    self.emit_string(last_field);
+    self.emit_byte(val_reg);
+    self.free_register(val_reg);
+
+    // Write back up the chain
+    for i in (1..chain_regs.len()).rev() {
+      let field = &path[i - 1];
+      self.emit_byte(OpCodeByte::SetProperty.to_byte());
+      self.emit_byte(chain_regs[i - 1]);
+      self.emit_string(field);
+      self.emit_byte(chain_regs[i]);
+      self.free_register(chain_regs[i]);
+    }
+
+    // Store root back to global
+    self.emit_store_global(root, root_reg);
+    self.free_register(root_reg);
+    Ok(())
+  }
+
+  /// Compile an expression statement (expression without assignment)
+  fn compile_expr_stmt(&mut self, expr: &Expr) -> Result<(), CompileError> {
+    let expr_reg = self.compile_expr(expr)?;
+    self.emit_byte(OpCodeByte::SetResult.to_byte());
+    self.emit_byte(expr_reg);
+    self.free_register(expr_reg);
+    Ok(())
+  }
+
+  /// Compile an if statement
+  fn compile_if_statement(
+    &mut self,
+    condition: &Expr,
+    then_branch: &[Stmt],
+    else_branch: &Option>,
+  ) -> Result<(), CompileError> {
+    let cond_reg = self.compile_expr(condition)?;
+    let else_label = self.create_label();
+    let end_label = self.create_label();
+
+    // Jump to else branch if condition is false
+    self.emit_byte(OpCodeByte::JumpIfFalse.to_byte());
+    self.emit_byte(cond_reg);
+    self.emit_jump_address(else_label);
+    self.free_register(cond_reg);
+
+    // Compile then branch
+    for stmt in then_branch {
+      self.compile_stmt(stmt)?;
+    }
+
+    // Jump to end after then branch
+    self.emit_jump(end_label);
+
+    // Compile else branch if it exists
+    self.set_label(else_label);
+    if let Some(else_stmts) = else_branch {
+      for stmt in else_stmts {
+        self.compile_stmt(stmt)?;
+      }
+    }
+
+    self.set_label(end_label);
+    Ok(())
+  }
+
+  /// Compile an expression
+  fn compile_expr(&mut self, expr: &Expr) -> Result {
+    match expr {
+      Expr::Value(value) => self.compile_value(value),
+      Expr::Variable(name) => self.compile_variable(name),
+      Expr::BinaryOp(left, op, right) => self.compile_binary_op(left, op, right),
+      Expr::UnaryOp(op, operand) => self.compile_unary_op(op, operand),
+      Expr::FunctionCall(name, args) => self.compile_function_call(name, args),
+      Expr::MethodCall(obj, method, args) => self.compile_method_call(obj, method, args),
+      Expr::PropertyAccess(obj, prop) => self.compile_property_access(obj, prop),
+    }
+  }
+
+  /// Compile a constant value
+  fn compile_value(&mut self, value: &Value) -> Result {
+    let reg = self.allocate_register()?;
+    self.emit_load_const(reg, value.clone());
+    Ok(reg)
+  }
+
+  /// Compile a variable reference
+  fn compile_variable(&mut self, name: &SmolStr) -> Result {
+    let reg = self.allocate_register()?;
+    self.emit_byte(OpCodeByte::LoadGlobal.to_byte());
+    self.emit_byte(reg);
+    self.emit_string(name);
+    Ok(reg)
+  }
+
+  /// Compile a binary operation
+  fn compile_binary_op(
+    &mut self,
+    left: &Expr,
+    op: &Op,
+    right: &Expr,
+  ) -> Result {
+    let left_reg = self.compile_expr(left)?;
+    let right_reg = self.compile_expr(right)?;
+    let result_reg = self.allocate_register()?;
+
+    let opcode = match op {
+      Op::Add => {
+        if self.is_string_concatenation(left, right) {
+          OpCodeByte::Concat
+        } else {
+          OpCodeByte::Add
+        }
+      }
+      Op::Sub => OpCodeByte::Sub,
+      Op::Mul => OpCodeByte::Mul,
+      Op::Div => OpCodeByte::Div,
+      Op::Mod => OpCodeByte::Mod,
+      Op::Pow => OpCodeByte::Pow,
+      Op::Lt => OpCodeByte::Lt,
+      Op::Lte => OpCodeByte::Lte,
+      Op::Gt => OpCodeByte::Gt,
+      Op::Gte => OpCodeByte::Gte,
+      Op::Eq => OpCodeByte::Eq,
+      Op::Neq => OpCodeByte::Neq,
+      Op::And => OpCodeByte::And,
+      Op::Or => OpCodeByte::Or,
+      Op::In => OpCodeByte::Contains,
+      _ => {
+        return Err(CompileError::InvalidExpression(format!(
+          "Unsupported binary operator: {:?}",
+          op
+        )));
+      }
+    };
+
+    self.emit_byte(opcode.to_byte());
+    self.emit_byte(result_reg);
+    self.emit_byte(left_reg);
+    self.emit_byte(right_reg);
+
+    self.free_register(left_reg);
+    self.free_register(right_reg);
+
+    Ok(result_reg)
+  }
+
+  /// Check if binary operation is string concatenation
+  fn is_string_concatenation(&self, left: &Expr, right: &Expr) -> bool {
+    matches!(left, Expr::Value(Value::String(_)))
+      || matches!(right, Expr::Value(Value::String(_)))
+  }
+
+  /// Compile a unary operation
+  fn compile_unary_op(&mut self, op: &Op, operand: &Expr) -> Result {
+    let operand_reg = self.compile_expr(operand)?;
+    let result_reg = self.allocate_register()?;
+
+    let opcode = match op {
+      Op::Neg => OpCodeByte::Neg,
+      Op::Not => OpCodeByte::Not,
+      _ => {
+        return Err(CompileError::InvalidExpression(format!(
+          "Unsupported unary operator: {:?}",
+          op
+        )));
+      }
+    };
+
+    self.emit_byte(opcode.to_byte());
+    self.emit_byte(result_reg);
+    self.emit_byte(operand_reg);
+
+    self.free_register(operand_reg);
+    Ok(result_reg)
+  }
+
+  /// Compile a function call (built-in or external)
+  fn compile_function_call(
+    &mut self,
+    name: &SmolStr,
+    args: &[Expr],
+  ) -> Result {
+    let arg_regs = self.compile_arguments(args)?;
+    let result_reg = self.allocate_register()?;
+
+    if name == "log" {
+      self.compile_builtin_log(&arg_regs, result_reg)?;
+    } else if let Some(fn_id) = crate::opcodes::default_fn::id(name) {
+      // Default (built-in) function — emit CallDefault with function ID
+      self.emit_byte(OpCodeByte::CallDefault.to_byte());
+      self.emit_byte(result_reg);
+      self.emit_byte(fn_id);
+      self.emit_byte(arg_regs.len() as u8);
+      for ® in &arg_regs {
+        self.emit_byte(reg);
+      }
+    } else {
+      // Emit CallExternal — resolved by VM at runtime
+      self.emit_byte(OpCodeByte::CallExternal.to_byte());
+      self.emit_byte(result_reg);
+      self.emit_string(name);
+      self.emit_byte(arg_regs.len() as u8);
+      for ® in &arg_regs {
+        self.emit_byte(reg);
+      }
+    }
+
+    // Free argument registers
+    for reg in arg_regs {
+      self.free_register(reg);
+    }
+
+    Ok(result_reg)
+  }
+
+  /// Compile function arguments and return their register numbers
+  fn compile_arguments(&mut self, args: &[Expr]) -> Result, CompileError> {
+    let mut arg_regs = Vec::with_capacity(args.len());
+    for arg in args {
+      let reg = self.compile_expr(arg)?;
+      arg_regs.push(reg);
+    }
+    Ok(arg_regs)
+  }
+
+  /// Compile built-in log function
+  fn compile_builtin_log(
+    &mut self,
+    arg_regs: &[u8],
+    result_reg: u8,
+  ) -> Result<(), CompileError> {
+    if let Some(&arg_reg) = arg_regs.first() {
+      self.emit_byte(OpCodeByte::Log.to_byte());
+      self.emit_byte(arg_reg);
+      self.emit_load_const(result_reg, Value::Null);
+      Ok(())
+    } else {
+      Err(CompileError::InvalidExpression(
+        "log requires an argument".to_string(),
+      ))
+    }
+  }
+
+  /// Compile a property access: `obj.field`
+  fn compile_property_access(
+    &mut self,
+    obj: &Expr,
+    prop: &SmolStr,
+  ) -> Result {
+    let obj_reg = self.compile_expr(obj)?;
+    let result_reg = self.allocate_register()?;
+    self.emit_byte(OpCodeByte::GetProperty.to_byte());
+    self.emit_byte(result_reg);
+    self.emit_byte(obj_reg);
+    self.emit_string(prop);
+    self.free_register(obj_reg);
+    Ok(result_reg)
+  }
+
+  /// Compile a method call
+  fn compile_method_call(
+    &mut self,
+    obj: &Expr,
+    method: &SmolStr,
+    args: &[Expr],
+  ) -> Result {
+    let obj_reg = self.compile_expr(obj)?;
+    let arg_regs = self.compile_arguments(args)?;
+    let result_reg = self.allocate_register()?;
+
+    // Emit method call instruction
+    self.emit_byte(OpCodeByte::MethodCall.to_byte());
+    self.emit_byte(result_reg);
+    self.emit_byte(obj_reg);
+    self.emit_string(method);
+    self.emit_byte(arg_regs.len() as u8);
+
+    // Emit argument registers
+    for ® in &arg_regs {
+      self.emit_byte(reg);
+    }
+
+    // Free object and argument registers
+    self.free_register(obj_reg);
+    for reg in arg_regs {
+      self.free_register(reg);
+    }
+
+    Ok(result_reg)
+  }
+
+  /// Allocate a register
+  fn allocate_register(&mut self) -> Result {
+    for i in 0..MAX_REGISTERS {
+      if !self.used_registers[i as usize] {
+        self.used_registers[i as usize] = true;
+        return Ok(i);
+      }
+    }
+
+    Err(CompileError::RegisterLimitExceeded)
+  }
+
+  /// Free a register
+  fn free_register(&mut self, reg: u8) {
+    if reg < MAX_REGISTERS {
+      self.used_registers[reg as usize] = false;
+    }
+  }
+
+  /// Create a new label
+  fn create_label(&mut self) -> usize {
+    let label = self.next_label;
+    self.next_label += 1;
+    label
+  }
+
+  /// Set a label position
+  fn set_label(&mut self, label: usize) {
+    let pos = self.writer.position();
+    self.labels.insert(label, pos);
+  }
+
+  /// Emit a jump address placeholder to be resolved later
+  fn emit_jump_address(&mut self, label: usize) -> usize {
+    let pos = self.writer.position();
+    self.emit_u32(0); // Placeholder
+    self.pending_jumps.push((pos, label));
+    pos
+  }
+
+  /// Emit a jump instruction (opcode + address)
+  fn emit_jump(&mut self, label: usize) {
+    self.emit_byte(OpCodeByte::Jump.to_byte());
+    self.emit_jump_address(label);
+  }
+
+  /// Resolve pending jumps by filling in jump addresses
+  fn resolve_jumps(&mut self) -> Result<(), CompileError> {
+    let bytecode = self.writer.bytecode();
+    let mut result = bytecode.to_vec();
+
+    for (jump_pos, label) in &self.pending_jumps {
+      let target_pos = self
+        .labels
+        .get(label)
+        .ok_or_else(|| CompileError::BytecodeError(format!("Undefined label: {}", label)))?;
+
+      self.write_u32_at_position(&mut result, *jump_pos, *target_pos as u32);
+    }
+
+    // Replace bytecode with resolved jumps
+    self.writer = BytecodeWriter::new();
+    for byte in result {
+      self.emit_byte(byte);
+    }
+
+    Ok(())
+  }
+
+  /// Write a u32 value at a specific position in bytecode (big-endian)
+  fn write_u32_at_position(&self, bytecode: &mut [u8], pos: usize, value: u32) {
+    bytecode[pos] = (value >> 24) as u8;
+    bytecode[pos + 1] = (value >> 16) as u8;
+    bytecode[pos + 2] = (value >> 8) as u8;
+    bytecode[pos + 3] = value as u8;
+  }
+
+  /// Emit a byte
+  fn emit_byte(&mut self, byte: u8) {
+    self.writer.write_byte(byte);
+  }
+
+  /// Emit a 32-bit integer
+  fn emit_u32(&mut self, value: u32) {
+    self.writer.write_u32(value);
+  }
+
+  /// Emit a string
+  fn emit_string(&mut self, s: &SmolStr) {
+    self.writer.write_string(s);
+  }
+
+  /// Emit a load constant instruction
+  fn emit_load_const(&mut self, reg: u8, value: Value) {
+    self.emit_byte(OpCodeByte::LoadConst.to_byte());
+    self.emit_byte(reg);
+    self.writer.write_value(&value);
+  }
+}
diff --git a/src/language_info.rs b/src/language_info.rs
new file mode 100644
index 0000000..4c568b0
--- /dev/null
+++ b/src/language_info.rs
@@ -0,0 +1,293 @@
+//! Language metadata for editor integration.
+//!
+//! Generates JSON describing built-in functions, methods per type,
+//! and host-registered extensions. The frontend editor library
+//! (`codemirror-lang-dexpr`) consumes this to provide type-aware autocomplete.
+//!
+//! # Usage
+//! ```rust
+//! use dexpr::language_info::LanguageInfo;
+//! use dexpr::ast::value::Value;
+//! use indexmap::IndexMap;
+//! use smol_str::SmolStr;
+//! use rust_decimal_macros::dec;
+//!
+//! let mut info = LanguageInfo::builtin();
+//!
+//! // Add host-registered functions
+//! info.add_function("getRate", "(code: String) -> Number", Some("Get exchange rate"));
+//!
+//! // Add host-registered methods
+//! info.add_method("String", "toTitleCase", "() -> String", None);
+//!
+//! // Add external variables — type inferred from Value
+//! let mut customer = IndexMap::new();
+//! customer.insert(SmolStr::new("name"), Value::String("Alice".into()));
+//! customer.insert(SmolStr::new("age"), Value::Number(dec!(30)));
+//! info.add_value("customer", &Value::Object(customer), None);
+//! info.add_value("price", &Value::Number(dec!(100)), None);
+//!
+//! let json = info.to_json();
+//! // Send `json` to frontend
+//! ```
+
+use crate::ast::value::Value;
+
+/// Function metadata
+pub struct FunctionInfo {
+    pub name: &'static str,
+    pub signature: &'static str,
+    pub doc: Option<&'static str>,
+}
+
+/// Method metadata
+pub struct MethodInfo {
+    pub name: &'static str,
+    pub signature: &'static str,
+    pub doc: Option<&'static str>,
+}
+
+/// Field metadata for Object type variables
+pub struct FieldInfo {
+    pub name: String,
+    pub type_name: String,
+}
+
+/// Variable metadata
+pub struct VariableInfo {
+    pub name: String,
+    pub type_name: String,
+    pub doc: Option,
+    pub fields: Option>,
+}
+
+/// Collected language metadata for editor autocomplete
+pub struct LanguageInfo {
+    pub functions: Vec,
+    pub methods: Vec<(&'static str, Vec)>,
+    pub variables: Vec,
+}
+
+impl LanguageInfo {
+    /// Create metadata with all built-in functions and methods
+    pub fn builtin() -> Self {
+        Self {
+            functions: builtin_functions(),
+            methods: builtin_methods(),
+            variables: Vec::new(),
+        }
+    }
+
+    /// Add a host-registered function
+    pub fn add_function(&mut self, name: &'static str, signature: &'static str, doc: Option<&'static str>) {
+        self.functions.push(FunctionInfo { name, signature, doc });
+    }
+
+    /// Add a host-registered method on a type
+    pub fn add_method(&mut self, type_name: &'static str, name: &'static str, signature: &'static str, doc: Option<&'static str>) {
+        if let Some(entry) = self.methods.iter_mut().find(|(t, _)| *t == type_name) {
+            entry.1.push(MethodInfo { name, signature, doc });
+        } else {
+            self.methods.push((type_name, vec![MethodInfo { name, signature, doc }]));
+        }
+    }
+
+    /// Add an external variable
+    pub fn add_variable(&mut self, name: impl Into, type_name: impl Into, doc: Option) {
+        self.variables.push(VariableInfo {
+            name: name.into(),
+            type_name: type_name.into(),
+            doc,
+            fields: None,
+        });
+    }
+
+    /// Add a variable by inspecting a Value — type and Object fields are derived automatically.
+    ///
+    /// This is the recommended way to register variables for editor autocomplete.
+    /// It mirrors what you pass to `vm.set_global()`.
+    ///
+    /// ```ignore
+    /// vm.set_global("customer", customer.clone());
+    /// info.add_value("customer", &customer, None);
+    /// ```
+    pub fn add_value(&mut self, name: impl Into, value: &Value, doc: Option) {
+        let type_name = value.type_name().to_string();
+        let fields = match value {
+            Value::Object(map) => {
+                Some(map.iter().map(|(k, v)| FieldInfo {
+                    name: k.to_string(),
+                    type_name: v.type_name().to_string(),
+                }).collect())
+            }
+            _ => None,
+        };
+        self.variables.push(VariableInfo {
+            name: name.into(),
+            type_name,
+            doc,
+            fields,
+        });
+    }
+
+    /// Add an Object variable with manually specified field types.
+    /// Use `add_value` instead when you have the actual Value.
+    pub fn add_object_variable(&mut self, name: impl Into, fields: Vec<(&str, &str)>, doc: Option) {
+        self.variables.push(VariableInfo {
+            name: name.into(),
+            type_name: "Object".to_string(),
+            doc,
+            fields: Some(fields.into_iter().map(|(n, t)| FieldInfo {
+                name: n.to_string(),
+                type_name: t.to_string(),
+            }).collect()),
+        });
+    }
+
+    /// Serialize to JSON string for the frontend editor
+    pub fn to_json(&self) -> String {
+        let mut out = String::with_capacity(2048);
+        out.push_str("{\n  \"functions\": [");
+        for (i, f) in self.functions.iter().enumerate() {
+            if i > 0 { out.push(','); }
+            out.push_str("\n    {\"name\":\"");
+            out.push_str(f.name);
+            out.push_str("\",\"signature\":\"");
+            out.push_str(f.signature);
+            out.push('"');
+            if let Some(doc) = f.doc {
+                out.push_str(",\"doc\":\"");
+                out.push_str(&escape_json(doc));
+                out.push('"');
+            }
+            out.push('}');
+        }
+        out.push_str("\n  ],\n  \"methods\": {");
+        for (i, (type_name, methods)) in self.methods.iter().enumerate() {
+            if i > 0 { out.push(','); }
+            out.push_str("\n    \"");
+            out.push_str(type_name);
+            out.push_str("\": [");
+            for (j, m) in methods.iter().enumerate() {
+                if j > 0 { out.push(','); }
+                out.push_str("\n      {\"name\":\"");
+                out.push_str(m.name);
+                out.push_str("\",\"signature\":\"");
+                out.push_str(m.signature);
+                out.push('"');
+                if let Some(doc) = m.doc {
+                    out.push_str(",\"doc\":\"");
+                    out.push_str(&escape_json(doc));
+                    out.push('"');
+                }
+                out.push('}');
+            }
+            out.push_str("\n    ]");
+        }
+        out.push_str("\n  },\n  \"variables\": [");
+        for (i, v) in self.variables.iter().enumerate() {
+            if i > 0 { out.push(','); }
+            out.push_str("\n    {\"name\":\"");
+            out.push_str(&escape_json(&v.name));
+            out.push_str("\",\"type\":\"");
+            out.push_str(&v.type_name);
+            out.push('"');
+            if let Some(doc) = &v.doc {
+                out.push_str(",\"doc\":\"");
+                out.push_str(&escape_json(doc));
+                out.push('"');
+            }
+            if let Some(fields) = &v.fields {
+                out.push_str(",\"fields\":[");
+                for (j, f) in fields.iter().enumerate() {
+                    if j > 0 { out.push(','); }
+                    out.push_str("{\"name\":\"");
+                    out.push_str(&escape_json(&f.name));
+                    out.push_str("\",\"type\":\"");
+                    out.push_str(&f.type_name);
+                    out.push_str("\"}");
+                }
+                out.push(']');
+            }
+            out.push('}');
+        }
+        out.push_str("\n  ]\n}");
+        out
+    }
+}
+
+fn escape_json(s: &str) -> String {
+    s.replace('\\', "\\\\")
+        .replace('"', "\\\"")
+        .replace('\n', "\\n")
+        .replace('\r', "\\r")
+        .replace('\t', "\\t")
+}
+
+fn builtin_functions() -> Vec {
+    vec![
+        FunctionInfo { name: "log", signature: "(...args) -> null", doc: Some("Print values to output") },
+        FunctionInfo { name: "rand", signature: "(min, max) -> Number", doc: Some("Random integer between min and max (inclusive)") },
+    ]
+}
+
+fn builtin_methods() -> Vec<(&'static str, Vec)> {
+    vec![
+        ("String", vec![
+            MethodInfo { name: "upper", signature: "() -> String", doc: None },
+            MethodInfo { name: "lower", signature: "() -> String", doc: None },
+            MethodInfo { name: "trim", signature: "() -> String", doc: None },
+            MethodInfo { name: "trimStart", signature: "() -> String", doc: None },
+            MethodInfo { name: "trimEnd", signature: "() -> String", doc: None },
+            MethodInfo { name: "split", signature: "(delim: String) -> StringList", doc: None },
+            MethodInfo { name: "replace", signature: "(old: String, new: String) -> String", doc: None },
+            MethodInfo { name: "contains", signature: "(substr: String) -> Boolean", doc: None },
+            MethodInfo { name: "startsWith", signature: "(prefix: String) -> Boolean", doc: None },
+            MethodInfo { name: "endsWith", signature: "(suffix: String) -> Boolean", doc: None },
+            MethodInfo { name: "length", signature: "() -> Number", doc: None },
+            MethodInfo { name: "charAt", signature: "(index: Number) -> String", doc: None },
+            MethodInfo { name: "substring", signature: "(start: Number, end?: Number) -> String", doc: None },
+        ]),
+        ("Number", vec![]),
+        ("Boolean", vec![]),
+        ("NumberList", vec![
+            MethodInfo { name: "length", signature: "() -> Number", doc: None },
+            MethodInfo { name: "len", signature: "() -> Number", doc: None },
+            MethodInfo { name: "isEmpty", signature: "() -> Boolean", doc: None },
+            MethodInfo { name: "first", signature: "() -> Number", doc: None },
+            MethodInfo { name: "last", signature: "() -> Number", doc: None },
+            MethodInfo { name: "get", signature: "(index: Number) -> Number", doc: None },
+            MethodInfo { name: "contains", signature: "(value: Number) -> Boolean", doc: None },
+            MethodInfo { name: "indexOf", signature: "(value: Number) -> Number", doc: None },
+            MethodInfo { name: "slice", signature: "(start: Number, end?: Number) -> NumberList", doc: None },
+            MethodInfo { name: "reverse", signature: "() -> NumberList", doc: None },
+            MethodInfo { name: "sort", signature: "() -> NumberList", doc: None },
+            MethodInfo { name: "sum", signature: "() -> Number", doc: None },
+            MethodInfo { name: "avg", signature: "() -> Number", doc: None },
+            MethodInfo { name: "min", signature: "() -> Number", doc: None },
+            MethodInfo { name: "max", signature: "() -> Number", doc: None },
+        ]),
+        ("Object", vec![
+            MethodInfo { name: "keys", signature: "() -> StringList", doc: Some("Get all keys") },
+            MethodInfo { name: "values", signature: "() -> StringList | NumberList", doc: Some("Get all values (must be same type)") },
+            MethodInfo { name: "length", signature: "() -> Number", doc: Some("Number of entries") },
+            MethodInfo { name: "len", signature: "() -> Number", doc: None },
+            MethodInfo { name: "contains", signature: "(key: String) -> Boolean", doc: Some("Check if key exists") },
+            MethodInfo { name: "get", signature: "(key: String) -> any", doc: Some("Get value by key") },
+        ]),
+        ("StringList", vec![
+            MethodInfo { name: "length", signature: "() -> Number", doc: None },
+            MethodInfo { name: "len", signature: "() -> Number", doc: None },
+            MethodInfo { name: "isEmpty", signature: "() -> Boolean", doc: None },
+            MethodInfo { name: "first", signature: "() -> String", doc: None },
+            MethodInfo { name: "last", signature: "() -> String", doc: None },
+            MethodInfo { name: "get", signature: "(index: Number) -> String", doc: None },
+            MethodInfo { name: "contains", signature: "(value: String) -> Boolean", doc: None },
+            MethodInfo { name: "indexOf", signature: "(value: String) -> Number", doc: None },
+            MethodInfo { name: "slice", signature: "(start: Number, end?: Number) -> StringList", doc: None },
+            MethodInfo { name: "reverse", signature: "() -> StringList", doc: None },
+            MethodInfo { name: "sort", signature: "() -> StringList", doc: None },
+            MethodInfo { name: "join", signature: "(delim?: String) -> String", doc: None },
+        ]),
+    ]
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..570d317
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,14 @@
+pub mod parser;
+pub mod compiler;
+pub mod vm;
+pub mod opcodes;
+pub mod ast;
+pub mod bytecode;
+pub mod bytecode_dump;
+pub mod language_info;
+
+// Re-export dependency types used in public API
+pub use rust_decimal::Decimal;
+pub use rust_decimal_macros::dec;
+pub use smol_str::SmolStr;
+pub use indexmap::IndexMap;
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..4ccf930
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,38 @@
+use dexpr::{ast::value::Value, compiler::Compiler, parser, vm::VM};
+use rust_decimal_macros::dec;
+
+fn main() -> Result<(), Box> {
+  let input = include_str!("basic_long.dexpr");
+
+  let ast = parser::program(input)?;
+
+  let mut compiler = Compiler::new();
+  let bytecode = compiler.compile(ast)?;
+
+  let num = dec!(3);
+  let mut vm = VM::new(&bytecode);
+  vm.set_global("test", Value::Number(num));
+  let res = vm.execute();
+  if res.is_err() {
+    println!("Error: {:?}", res.unwrap_err());
+  }
+
+  let code = r#"x = 10
+y = 0
+result = x / y"#;
+
+  let mut compiler = Compiler::new();
+  let (bytecode, debug_info) = compiler
+    .compile_from_source(code)
+    .expect("Failed to compile");
+
+  let mut vm = VM::new(&bytecode);
+  vm.set_debug_info(&debug_info);
+
+  let err = vm.execute().unwrap_err();
+  let err_msg = err.to_string();
+
+  println!("Error message:\n{}", err_msg);
+
+  Ok(())
+}
diff --git a/src/opcodes.rs b/src/opcodes.rs
new file mode 100644
index 0000000..27b184c
--- /dev/null
+++ b/src/opcodes.rs
@@ -0,0 +1,184 @@
+/// Register identifier
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct Register(pub u8);
+
+/// Default (built-in) function IDs for CallDefault opcode
+pub mod default_fn {
+  pub const RAND: u8 = 0;
+  // Future: ABS = 1, MIN = 2, MAX = 3, FLOOR = 4, CEIL = 5, ROUND = 6, ...
+
+  /// Lookup table: function name → ID
+  pub const NAMES: &[(&str, u8)] = &[("rand", RAND)];
+
+  /// Get function name by ID
+  pub fn name(id: u8) -> Option<&'static str> {
+    NAMES.iter().find(|(_, i)| *i == id).map(|(n, _)| *n)
+  }
+
+  /// Get function ID by name
+  pub fn id(name: &str) -> Option {
+    NAMES.iter().find(|(n, _)| *n == name).map(|(_, i)| *i)
+  }
+}
+
+/// Bytecode opcodes
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum OpCodeByte {
+  // Register operations
+  LoadConst = 0x10, // Load constant to register
+  Move = 0x11,      // Move value between registers
+
+  // Memory operations
+  LoadLocal = 0x20,   // Load local variable to register
+  StoreLocal = 0x21,  // Store register to local variable
+  LoadGlobal = 0x22,  // Load global variable to register
+  StoreGlobal = 0x23, // Store register to global variable
+
+  // Arithmetic operations
+  Add = 0x30, // Addition
+  Sub = 0x31, // Subtraction
+  Mul = 0x32, // Multiplication
+  Div = 0x33, // Division
+  Neg = 0x34, // Negation
+  Mod = 0x35, // Modulo
+  Pow = 0x36, // Power
+
+  // Comparison operations
+  Lt = 0x40,  // Less than
+  Lte = 0x41, // Less than or equal
+  Gt = 0x42,  // Greater than
+  Gte = 0x43, // Greater than or equal
+  Eq = 0x44,  // Equal
+  Neq = 0x45, // Not equal
+
+  // Boolean operations
+  And = 0x50, // Logical AND
+  Or = 0x51,  // Logical OR
+  Not = 0x52, // Logical NOT
+
+  // Membership test
+  Contains = 0x53, // Check if value is in list/string
+
+  // Control flow
+  Jump = 0x60,        // Should read 4-byte address
+  JumpIfFalse = 0x61, // Should read register + 4-byte address
+
+  // String operations
+  Concat = 0x80, // String concatenation
+
+  // Property & method calls
+  GetProperty = 0x91, // Get object property: dest, obj, name
+  SetProperty = 0x92, // Set object property: obj, name, value
+  MethodCall = 0x90,  // Call method on object
+
+  // Built-in functions
+  Log = 0xA0,          // Print a value
+  CallExternal = 0xA1, // Call external (host) function
+  CallDefault = 0xA2,  // Call default (built-in) function by ID
+
+  // Result
+  SetResult = 0xB0, // Set expression result (for return value)
+
+  // End marker
+  End = 0xFF, // End of program
+}
+
+impl OpCodeByte {
+  /// Convert opcode to byte
+  pub fn to_byte(self) -> u8 {
+    self as u8
+  }
+
+  /// Static lookup table for fast byte to opcode conversion
+  const LOOKUP: [Option; 256] = {
+    let mut table = [None; 256];
+    let mut i = 0;
+    while i < 256 {
+      table[i] = match i as u8 {
+        0x10 => Some(OpCodeByte::LoadConst),
+        0x11 => Some(OpCodeByte::Move),
+        0x20 => Some(OpCodeByte::LoadLocal),
+        0x21 => Some(OpCodeByte::StoreLocal),
+        0x22 => Some(OpCodeByte::LoadGlobal),
+        0x23 => Some(OpCodeByte::StoreGlobal),
+        0x30 => Some(OpCodeByte::Add),
+        0x31 => Some(OpCodeByte::Sub),
+        0x32 => Some(OpCodeByte::Mul),
+        0x33 => Some(OpCodeByte::Div),
+        0x34 => Some(OpCodeByte::Neg),
+        0x35 => Some(OpCodeByte::Mod),
+        0x36 => Some(OpCodeByte::Pow),
+        0x40 => Some(OpCodeByte::Lt),
+        0x41 => Some(OpCodeByte::Lte),
+        0x42 => Some(OpCodeByte::Gt),
+        0x43 => Some(OpCodeByte::Gte),
+        0x44 => Some(OpCodeByte::Eq),
+        0x45 => Some(OpCodeByte::Neq),
+        0x50 => Some(OpCodeByte::And),
+        0x51 => Some(OpCodeByte::Or),
+        0x52 => Some(OpCodeByte::Not),
+        0x53 => Some(OpCodeByte::Contains),
+        0x60 => Some(OpCodeByte::Jump),
+        0x61 => Some(OpCodeByte::JumpIfFalse),
+        0x80 => Some(OpCodeByte::Concat),
+        0x90 => Some(OpCodeByte::MethodCall),
+        0x91 => Some(OpCodeByte::GetProperty),
+        0x92 => Some(OpCodeByte::SetProperty),
+        0xA0 => Some(OpCodeByte::Log),
+        0xA1 => Some(OpCodeByte::CallExternal),
+        0xA2 => Some(OpCodeByte::CallDefault),
+        0xB0 => Some(OpCodeByte::SetResult),
+        0xFF => Some(OpCodeByte::End),
+        _ => None,
+      };
+      i += 1;
+    }
+    table
+  };
+
+  /// Convert byte to opcode
+  #[inline(always)]
+  pub fn from_byte(byte: u8) -> Option {
+    Self::LOOKUP[byte as usize]
+  }
+
+  /// Get opcode name
+  pub fn name(&self) -> &'static str {
+    match self {
+      OpCodeByte::LoadConst => "LoadConst",
+      OpCodeByte::Move => "Move",
+      OpCodeByte::LoadLocal => "LoadLocal",
+      OpCodeByte::StoreLocal => "StoreLocal",
+      OpCodeByte::LoadGlobal => "LoadGlobal",
+      OpCodeByte::StoreGlobal => "StoreGlobal",
+      OpCodeByte::Add => "Add",
+      OpCodeByte::Sub => "Sub",
+      OpCodeByte::Mul => "Mul",
+      OpCodeByte::Div => "Div",
+      OpCodeByte::Neg => "Neg",
+      OpCodeByte::Mod => "Mod",
+      OpCodeByte::Pow => "Pow",
+      OpCodeByte::Lt => "Lt",
+      OpCodeByte::Lte => "Lte",
+      OpCodeByte::Gt => "Gt",
+      OpCodeByte::Gte => "Gte",
+      OpCodeByte::Eq => "Eq",
+      OpCodeByte::Neq => "Neq",
+      OpCodeByte::And => "And",
+      OpCodeByte::Or => "Or",
+      OpCodeByte::Not => "Not",
+      OpCodeByte::Contains => "Contains",
+      OpCodeByte::Jump => "Jump",
+      OpCodeByte::JumpIfFalse => "JumpIfFalse",
+      OpCodeByte::Concat => "Concat",
+      OpCodeByte::MethodCall => "MethodCall",
+      OpCodeByte::GetProperty => "GetProperty",
+      OpCodeByte::SetProperty => "SetProperty",
+      OpCodeByte::Log => "Log",
+      OpCodeByte::CallExternal => "CallExternal",
+      OpCodeByte::CallDefault => "Rand",
+      OpCodeByte::SetResult => "SetResult",
+      OpCodeByte::End => "End",
+    }
+  }
+}
diff --git a/src/parser/grammar.rs b/src/parser/grammar.rs
new file mode 100644
index 0000000..4de2e03
--- /dev/null
+++ b/src/parser/grammar.rs
@@ -0,0 +1,430 @@
+use rust_decimal::Decimal;
+use smol_str::SmolStr;
+use std::str::FromStr;
+
+use crate::ast::{
+  expr::{Expr, Op},
+  stmt::Stmt,
+  value::Value,
+};
+
+peg::parser!(
+pub grammar parser() for str {
+  pub rule program() -> Vec
+    = s:statement()* { s }
+
+  /// Parse program with source location info for each statement
+  pub rule program_with_spans() -> Vec<(usize, Stmt)>
+    = s:statement_with_pos()* { s }
+
+  /// Statement with position info (byte offset)
+  rule statement_with_pos() -> (usize, Stmt)
+    = whitespace()?
+    pos:position!()
+    s:(
+        assignment()
+      / if_stmt()
+      / expr_stmt()
+    )
+    whitespace()? { (pos, s) }
+
+  pub rule statement() -> Stmt
+    = whitespace()?
+    s:(
+        assignment()
+      / if_stmt()
+      / expr_stmt()
+    )
+    whitespace()? { s }
+
+  pub rule expression() -> Expr
+    = binary_op()
+
+  pub rule mul_div() -> Expr =
+    left:power() mul_div_right:(
+        _ op:$("*" / "/" / "%") _ right:power()
+        { (op, right) }
+    )* {
+        let mut result = left;
+        for (op, right) in mul_div_right {
+            result = match op {
+                "*" => Expr::BinaryOp(Box::new(result), Op::Mul, Box::new(right)),
+                "/" => Expr::BinaryOp(Box::new(result), Op::Div, Box::new(right)),
+                "%" => Expr::BinaryOp(Box::new(result), Op::Mod, Box::new(right)),
+                _ => unreachable!()
+            };
+        }
+        result
+    }
+
+  pub rule power() -> Expr =
+    base:postfix() _ "**" _ exp:power() { Expr::BinaryOp(Box::new(base), Op::Pow, Box::new(exp)) }
+    / a:postfix() { a }
+
+
+  pub rule binary_op() -> Expr = precedence!{
+    i:identifier() _ "(" args:((_ e:expression() _ {e}) ** ",") ")" { Expr::FunctionCall(i, args) }
+    --
+    x:@ _ "&&" _ y:(@) { Expr::BinaryOp(Box::new(x), Op::And, Box::new(y)) }
+    x:@ _ "||" _ y:(@) { Expr::BinaryOp(Box::new(x), Op::Or, Box::new(y)) }
+    --
+    x:@ _ "==" _ y:(@) { Expr::BinaryOp(Box::new(x), Op::Eq, Box::new(y)) }
+    x:@ _ "!=" _ y:(@) { Expr::BinaryOp(Box::new(x), Op::Neq, Box::new(y)) }
+    x:@ _ "<"  _ y:(@) { Expr::BinaryOp(Box::new(x), Op::Lt, Box::new(y)) }
+    x:@ _ "<=" _ y:(@) { Expr::BinaryOp(Box::new(x), Op::Lte, Box::new(y)) }
+    x:@ _ ">"  _ y:(@) { Expr::BinaryOp(Box::new(x), Op::Gt, Box::new(y)) }
+    x:@ _ ">=" _ y:(@) { Expr::BinaryOp(Box::new(x), Op::Gte, Box::new(y)) }
+    x:@ _ "in" _ y:(@) { Expr::BinaryOp(Box::new(x), Op::In, Box::new(y)) }
+    --
+    x:@ _ "+" _ y:(@) { Expr::BinaryOp(Box::new(x),Op::Add, Box::new(y)) }
+    x:@ _ "-" _ y:(@) { Expr::BinaryOp(Box::new(x),Op::Sub, Box::new(y)) }
+    --
+    x:mul_div() { x }
+    --
+    p:postfix() { p }
+  }
+
+  /// Postfix operations: property access and method calls with chaining
+  rule postfix() -> Expr
+    = base:atom() chain:(
+        "." m:identifier() "(" args:((_ e:expression() _ {e}) ** ",") ")" { (m, Some(args)) }
+        / "." p:identifier() { (p, None) }
+      )* {
+        let mut result = base;
+        for (name, args) in chain {
+          if let Some(args) = args {
+            result = Expr::MethodCall(Box::new(result), name, args);
+          } else {
+            result = Expr::PropertyAccess(Box::new(result), name);
+          }
+        }
+        result
+      }
+
+  rule atom() -> Expr
+    = i:identifier() { Expr::Variable(i) }
+    / i:string() { Expr::Value(Value::String(i)) }
+    / i:number() { Expr::Value(Value::Number(i)) }
+    / i:boolean_literal() { Expr::Value(i) }
+    / "(" e:expression() ")" { e }
+    / "-" e:atom() { Expr::UnaryOp(Op::Neg, Box::new(e)) }
+    / "!" e:atom() { Expr::UnaryOp(Op::Not, Box::new(e)) }
+
+  pub rule string() -> SmolStr
+    = "\"" s:$(([^'"'] / "\\\"")*) "\"" {
+      s.replace("\\\"", "\"").into()
+    }
+    / "'" s:$(([^'\''] / "\\''")*) "'" {
+        s.replace("\\'", "'").into()
+    }
+  
+  rule boolean_literal() -> Value
+    = "true" { Value::Boolean(true) }
+    / "false" { Value::Boolean(false) }
+
+
+  pub rule expr_stmt() -> Stmt
+    = e:expression() { Stmt::ExprStmt(Box::new(e)) }
+
+  pub rule if_stmt() -> Stmt
+    = "if" _ cond:expression() whitespace()? "then" whitespace()?
+      then_body:statement()* whitespace()?
+      else_part:else_clause()?
+      "end" whitespace()? {
+        Stmt::If(Box::new(cond), then_body, else_part)
+      }
+
+  pub rule else_clause() -> Vec
+    = "else if" whitespace()? cond:expression() whitespace()? "then" whitespace()?
+      then_body:statement()* whitespace()?
+      else_part:else_clause()? whitespace()? {
+        vec![Stmt::If(Box::new(cond), then_body, else_part)]
+      }
+    / "else" whitespace()? else_body:statement()* whitespace()? {
+        else_body
+      }
+
+  pub rule assignment() -> Stmt
+    = i:identifier() path:("." p:identifier() { p })+ _ "=" _ value:expression() {
+        Stmt::PropertyAssignment(i, path, Box::new(value))
+    }
+    / i:identifier() _ op:compound_op() _ value:expression() {
+        // Desugar compound assignment: x += 1 becomes x = x + 1
+        let var_expr = Expr::Variable(i.clone());
+        let combined = Expr::BinaryOp(Box::new(var_expr), op, Box::new(value));
+        Stmt::Assignment(i, Box::new(combined))
+    }
+    / i:identifier() _ "=" _ value:expression() { Stmt::Assignment(i, Box::new(value)) }
+
+  rule compound_op() -> Op
+    = "+=" { Op::Add }
+    / "-=" { Op::Sub }
+    / "*=" { Op::Mul }
+    / "/=" { Op::Div }
+    / "%=" { Op::Mod }
+
+  rule keyword()
+  = ("if" / "then" / "else" / "end" / "true" / "false" / "in") !['a'..='z' | 'A'..='Z' | '0'..='9' | '_']
+
+  rule identifier() -> SmolStr
+  = !keyword() s:$(['a'..='z' | 'A'..='Z' | '_']['a'..='z' | 'A'..='Z' | '0'..='9' | '_']*)
+    { s.into() }
+
+  rule number() -> Decimal
+  = n:$(['0'..='9']+ ("." ['0'..='9']+)?) {?
+      Decimal::from_str(n).map_err(|_| "invalid decimal")
+  }
+
+  rule whitespace()
+    = ([' ' | '\t' | '\n' | '\r'] / comment())+
+
+  rule comment()
+    = "//" [^'\n']* "\n"?
+    / "/*" (!"*/" [_])* "*/"
+
+  rule _() = quiet!{([' ' | '\t'] / comment())*}
+
+  // rule string_lit() -> Expr
+  //     = "\"" s:$([^'"']*) "\""
+  //       { Expr::String(s.to_string()) }
+  }
+);
+
+#[cfg(test)]
+mod tests {
+  use super::*;
+
+  #[test]
+  fn test_binary_op() {
+    let res = parser::binary_op("1 + 2 * 3 - 4 / 5");
+    if let Err(e) = &res {
+      println!("{}", e);
+    }
+    if let Ok(expr) = res {
+      match expr {
+        Expr::BinaryOp(left, Op::Add, right) => {
+          assert!(matches!(*left, Expr::Value(_)));
+          match *right {
+            Expr::BinaryOp(left2, Op::Sub, right2) => {
+              // Check 2 * 3
+              match *left2 {
+                Expr::BinaryOp(left3, Op::Mul, right3) => {
+                  assert!(matches!(*left3, Expr::Value(_)));
+                  assert!(matches!(*right3, Expr::Value(_)));
+                }
+                _ => panic!("Expected multiplication"),
+              }
+              // Check 4 / 5
+              match *right2 {
+                Expr::BinaryOp(left3, Op::Div, right3) => {
+                  assert!(matches!(*left3, Expr::Value(_)));
+                  assert!(matches!(*right3, Expr::Value(_)));
+                }
+                _ => panic!("Expected division"),
+              }
+            }
+            _ => panic!("Expected subtraction"),
+          }
+        }
+        _ => panic!("Expected addition at top level"),
+      }
+    } else {
+      panic!("Failed to parse expression");
+    }
+  }
+
+  #[test]
+  fn test_function_call() {
+    assert!(matches!(
+      parser::expression("add(1, 2)"),
+      Ok(Expr::FunctionCall(_, _))
+    ));
+  }
+
+  #[test]
+  fn test_var_decl() {
+    let input = "x = 1";
+    let res = parser::assignment(input);
+    assert!(matches!(res, Ok(Stmt::Assignment(_, _))));
+  }
+
+  #[test]
+  fn test_simple_arithmetic() {
+    let input = "x = 1 + 2 * 3";
+    let result = parser::program(input).unwrap();
+
+    assert_eq!(result.len(), 1);
+    if let Stmt::Assignment(name, expr) = &result[0] {
+      assert_eq!(name, "x");
+      if let Expr::BinaryOp(left, op, right) = expr.as_ref() {
+        assert!(matches!(op, Op::Add));
+        assert!(matches!(**left, Expr::Value(Value::Number(_))));
+        if let Expr::BinaryOp(mul_left, mul_op, mul_right) = right.as_ref() {
+          assert!(matches!(mul_op, Op::Mul));
+          assert!(matches!(**mul_left, Expr::Value(Value::Number(_))));
+          assert!(matches!(**mul_right, Expr::Value(Value::Number(_))));
+        } else {
+          panic!("Expected multiplication operation");
+        }
+      } else {
+        panic!("Expected binary operation");
+      }
+    } else {
+      panic!("Expected assignment statement");
+    }
+  }
+
+  #[test]
+  fn test_if_statement() {
+    let input = "if x < 10 then y = x else y = 0 end";
+    let result = parser::program(input).unwrap();
+
+    assert_eq!(result.len(), 1);
+    if let Stmt::If(condition, then_branch, else_branch) = &result[0] {
+      // Check condition
+      if let Expr::BinaryOp(left, op, right) = condition.as_ref() {
+        assert!(matches!(op, Op::Lt));
+        assert!(matches!(**left, Expr::Variable(_)));
+        assert!(matches!(**right, Expr::Value(Value::Number(_))));
+      } else {
+        panic!("Expected binary operation in condition");
+      }
+
+      // Check then branch
+      assert_eq!(then_branch.len(), 1);
+      assert!(matches!(&then_branch[0], Stmt::Assignment(_, _)));
+
+      // Check else branch
+      assert!(else_branch.is_some());
+      let else_branch = else_branch.as_ref().unwrap();
+      assert_eq!(else_branch.len(), 1);
+      assert!(matches!(&else_branch[0], Stmt::Assignment(_, _)));
+    } else {
+      panic!("Expected if statement");
+    }
+  }
+
+  #[test]
+  fn test_nested_function_calls() {
+    let input = "result = max(min(a, b), abs(c))";
+    let result = parser::program(input).unwrap();
+
+    assert_eq!(result.len(), 1);
+    if let Stmt::Assignment(name, expr) = &result[0] {
+      assert_eq!(name, "result");
+      if let Expr::FunctionCall(func_name, args) = expr.as_ref() {
+        assert_eq!(func_name, "max");
+        assert_eq!(args.len(), 2);
+
+        // Check first argument (min call)
+        if let Expr::FunctionCall(inner_func, inner_args) = &args[0] {
+          assert_eq!(inner_func, "min");
+          assert_eq!(inner_args.len(), 2);
+        } else {
+          panic!("Expected min function call");
+        }
+
+        // Check second argument (abs call)
+        if let Expr::FunctionCall(inner_func, inner_args) = &args[1] {
+          assert_eq!(inner_func, "abs");
+          assert_eq!(inner_args.len(), 1);
+        } else {
+          panic!("Expected abs function call");
+        }
+      } else {
+        panic!("Expected function call");
+      }
+    }
+  }
+
+  #[test]
+  fn test_decimal_numbers() {
+    let input = "x = 123.456";
+    let result = parser::program(input).unwrap();
+
+    if let Stmt::Assignment(_, expr) = &result[0] {
+      if let Expr::Value(Value::Number(n)) = expr.as_ref() {
+        assert_eq!(*n, Decimal::from_str("123.456").unwrap());
+      } else {
+        panic!("Expected decimal number");
+      }
+    }
+  }
+
+  #[test]
+  fn test_complex_nested_if() {
+    let input = r#"
+            if x > 0 then
+                if y > 0 then
+                    result = x + y
+                else
+                    result = x - y
+                end
+            else
+                result = 0
+            end
+        "#;
+    let result = parser::program(input).unwrap();
+
+    assert_eq!(result.len(), 1);
+    if let Stmt::If(_, then_branch, else_branch) = &result[0] {
+      // Check that then_branch contains another if statement
+      assert_eq!(then_branch.len(), 1);
+      assert!(matches!(&then_branch[0], Stmt::If(_, _, _)));
+
+      // Check else branch
+      assert!(else_branch.is_some());
+      let else_branch = else_branch.as_ref().unwrap();
+      assert_eq!(else_branch.len(), 1);
+      assert!(matches!(&else_branch[0], Stmt::Assignment(_, _)));
+    }
+  }
+
+  #[test]
+  fn test_syntax_errors() {
+    // Missing 'end' keyword
+    assert!(parser::program("if x < 10 then y = x").is_err());
+
+    // Invalid expression
+    assert!(parser::program("x = 1 + * 2").is_err());
+  }
+
+  #[test]
+  fn test_whitespace_handling() {
+    let input1 = "x=1+2";
+    let input2 = "x = 1 + 2";
+    let input3 = "x   =   1   +   2";
+
+    let result1 = parser::program(input1).unwrap();
+    let result2 = parser::program(input2).unwrap();
+    let result3 = parser::program(input3).unwrap();
+
+    // All should produce equivalent ASTs
+    assert_eq!(result1, result2);
+    assert_eq!(result2, result3);
+  }
+
+  #[test]
+  fn test_compound_assignment_parsing() {
+    let input = "x += 5";
+    let result = parser::program(input);
+    println!("Result: {:?}", result);
+    let result = result.unwrap();
+    assert_eq!(result.len(), 1);
+    if let Stmt::Assignment(name, expr) = &result[0] {
+      assert_eq!(name, "x");
+      // Should be desugared to x + 5
+      if let Expr::BinaryOp(left, op, right) = expr.as_ref() {
+        assert!(matches!(op, Op::Add));
+        // left should be Variable("x")
+        assert!(matches!(**left, Expr::Variable(_)));
+        // right should be Number(5)
+        assert!(matches!(**right, Expr::Value(Value::Number(_))));
+      } else {
+        panic!("Expected BinaryOp after desugaring, got {:?}", expr);
+      }
+    } else {
+      panic!("Expected Assignment, got {:?}", result[0]);
+    }
+  }
+}
diff --git a/src/parser/mod.rs b/src/parser/mod.rs
new file mode 100644
index 0000000..6a6390e
--- /dev/null
+++ b/src/parser/mod.rs
@@ -0,0 +1,29 @@
+mod grammar;
+
+use crate::ast::expr::Span;
+
+pub use grammar::parser::program;
+pub use grammar::parser::program_with_spans;
+
+/// Convert a byte offset in source code to line and column numbers
+/// Lines and columns are 1-indexed
+pub fn offset_to_span(source: &str, offset: usize) -> Span {
+  let mut line = 1u32;
+  let mut col = 1u32;
+  let mut current_offset = 0;
+
+  for ch in source.chars() {
+    if current_offset >= offset {
+      break;
+    }
+    if ch == '\n' {
+      line += 1;
+      col = 1;
+    } else {
+      col += 1;
+    }
+    current_offset += ch.len_utf8();
+  }
+
+  Span::new(line, col)
+}
\ No newline at end of file
diff --git a/src/sample.dexpr b/src/sample.dexpr
new file mode 100644
index 0000000..bef48e7
--- /dev/null
+++ b/src/sample.dexpr
@@ -0,0 +1,28 @@
+a = 10.2
+b = a + 5.5
+c = 2.4
+
+log(b + c)
+
+log("Merhaba" + " duhan".upper())
+
+log((3+3)*2/3)
+
+t = 3+3
+log(t*2/3)
+
+if true then
+	log("true")
+else
+	log("false")
+end
+
+aaa = false
+
+if false && true then
+	log("11")
+else if 2 > 1 && 2 >= 2 && !aaa then
+	log("22")
+else if true then
+	log("33")
+end
\ No newline at end of file
diff --git a/src/sample_test.dexpr b/src/sample_test.dexpr
new file mode 100644
index 0000000..853b18b
--- /dev/null
+++ b/src/sample_test.dexpr
@@ -0,0 +1,28 @@
+a = 10.2
+b = a + 5.5
+c = 2.4
+
+b + c
+
+"Merhaba" + " duhan".upper()
+
+(3+3)*2/3
+
+t = 3+3
+t*2/3
+
+if true then
+	"true"
+else
+	"false"
+end
+
+aaa = false
+
+if false && true then
+	"11"
+else if 2 > 1 && 2 >= 2 && !aaa then
+	"22"
+else if true then
+	"33"
+end
\ No newline at end of file
diff --git a/src/sample_test_asm.txt b/src/sample_test_asm.txt
new file mode 100644
index 0000000..4a634e7
--- /dev/null
+++ b/src/sample_test_asm.txt
@@ -0,0 +1,23 @@
+fib:
+  push rbp
+  movrr rbp, rsp
+  movsr rbp, r1
+  cmpsi rbp, 0
+  jg .L0
+  movri eax, 0
+  ret
+.L0:
+  cmpsi rbp, 2
+  jg .L1
+  movri eax, 1
+  ret
+.L1:
+  movrs r1, rbp
+  
+  
+  
+main:
+  add rsp, 16
+  movsi 16(byte) rbp, 10
+  movrs r1, rbp
+  call fib
\ No newline at end of file
diff --git a/src/vm/debug_info.rs b/src/vm/debug_info.rs
new file mode 100644
index 0000000..2e7738c
--- /dev/null
+++ b/src/vm/debug_info.rs
@@ -0,0 +1,95 @@
+use crate::ast::expr::Span;
+
+/// Debug information that maps bytecode offsets to source locations.
+/// Uses a run-length encoded format: each entry covers instructions from
+/// its offset until the next entry's offset.
+#[derive(Debug, Clone, Default)]
+pub struct DebugInfo {
+  /// Sorted list of (bytecode_offset, span) pairs
+  entries: Vec<(u32, Span)>,
+}
+
+impl DebugInfo {
+  pub fn new() -> Self {
+    Self {
+      entries: Vec::new(),
+    }
+  }
+
+  /// Add a mapping from a bytecode offset to a source span.
+  /// Entries must be added in increasing offset order.
+  pub fn add_entry(&mut self, offset: u32, span: Span) {
+    // Only add if different from the last entry's span
+    if let Some((_, last_span)) = self.entries.last() {
+      if *last_span == span {
+        return;
+      }
+    }
+    self.entries.push((offset, span));
+  }
+
+  /// Look up the source span for a given bytecode offset.
+  /// Returns None if no debug info is available.
+  pub fn get_span(&self, offset: u32) -> Option {
+    if self.entries.is_empty() {
+      return None;
+    }
+
+    // Binary search for the largest offset <= target
+    match self.entries.binary_search_by_key(&offset, |(off, _)| *off) {
+      Ok(idx) => Some(self.entries[idx].1),
+      Err(idx) => {
+        if idx == 0 {
+          // Before the first entry
+          None
+        } else {
+          // Use the previous entry
+          Some(self.entries[idx - 1].1)
+        }
+      }
+    }
+  }
+
+  /// Check if debug info is available
+  pub fn is_empty(&self) -> bool {
+    self.entries.is_empty()
+  }
+
+  /// Get the number of entries
+  pub fn len(&self) -> usize {
+    self.entries.len()
+  }
+}
+
+#[cfg(test)]
+mod tests {
+  use super::*;
+
+  #[test]
+  fn test_debug_info_lookup() {
+    let mut info = DebugInfo::new();
+    info.add_entry(0, Span::new(1, 1));
+    info.add_entry(10, Span::new(2, 5));
+    info.add_entry(20, Span::new(3, 10));
+
+    // Exact matches
+    assert_eq!(info.get_span(0), Some(Span::new(1, 1)));
+    assert_eq!(info.get_span(10), Some(Span::new(2, 5)));
+    assert_eq!(info.get_span(20), Some(Span::new(3, 10)));
+
+    // In-between values use previous entry
+    assert_eq!(info.get_span(5), Some(Span::new(1, 1)));
+    assert_eq!(info.get_span(15), Some(Span::new(2, 5)));
+    assert_eq!(info.get_span(100), Some(Span::new(3, 10)));
+  }
+
+  #[test]
+  fn test_duplicate_spans_not_added() {
+    let mut info = DebugInfo::new();
+    info.add_entry(0, Span::new(1, 1));
+    info.add_entry(5, Span::new(1, 1)); // Same span, should not add
+    info.add_entry(10, Span::new(2, 1));
+
+    assert_eq!(info.len(), 2);
+  }
+}
diff --git a/src/vm/error.rs b/src/vm/error.rs
new file mode 100644
index 0000000..eb1472a
--- /dev/null
+++ b/src/vm/error.rs
@@ -0,0 +1,64 @@
+use crate::ast::expr::Span;
+use smol_str::SmolStr;
+use thiserror::Error;
+
+/// Errors that can occur during VM execution
+#[derive(Debug, Error)]
+pub enum VMError {
+  /// Error when types don't match the operation's expectations
+  #[error("Type error: expected {expected}, got {got}")]
+  TypeMismatch { expected: String, got: String },
+
+  /// Error when a variable is not defined
+  #[error("Undefined variable: {0}")]
+  UndefinedVariable(SmolStr),
+
+  /// Error when dividing by zero
+  #[error("Division by zero")]
+  DivisionByZero,
+
+  /// Error in bytecode format or execution
+  #[error("Bytecode error: {0}")]
+  BytecodeError(String),
+
+  /// Error when a method is not found for a type
+  #[error("Method '{method}' not found for type '{type_name}'")]
+  MethodNotFound {
+    type_name: &'static str,
+    method: SmolStr,
+  },
+
+  /// Generic runtime error
+  #[error("Runtime error: {0}")]
+  RuntimeError(String),
+
+  /// Error when an invalid operation is performed
+  #[error("Type error: cannot {operation} {left_type} and {right_type}")]
+  InvalidOperation {
+    operation: &'static str,
+    left_type: &'static str,
+    right_type: &'static str,
+  },
+
+  /// Error with source location information
+  #[error("Error at {span}: {message}")]
+  WithLocation { span: Span, message: String },
+}
+
+impl VMError {
+  /// Wrap this error with source location information
+  pub fn with_span(self, span: Span) -> Self {
+    // Don't double-wrap location errors
+    if matches!(self, VMError::WithLocation { .. }) {
+      return self;
+    }
+    // Only wrap if we have a valid span (non-zero)
+    if span.line == 0 && span.column == 0 {
+      return self;
+    }
+    VMError::WithLocation {
+      span,
+      message: self.to_string(),
+    }
+  }
+}
diff --git a/src/vm/mod.rs b/src/vm/mod.rs
new file mode 100644
index 0000000..c987283
--- /dev/null
+++ b/src/vm/mod.rs
@@ -0,0 +1,7 @@
+mod debug_info;
+pub mod error;
+mod vm;
+
+pub use debug_info::DebugInfo;
+pub use error::VMError;
+pub use vm::{ExternalFn, ExternalMethod, VM};
diff --git a/src/vm/vm.rs b/src/vm/vm.rs
new file mode 100644
index 0000000..33f49b0
--- /dev/null
+++ b/src/vm/vm.rs
@@ -0,0 +1,1417 @@
+use crate::{ast::value::Value, bytecode::BytecodeReader, opcodes::OpCodeByte};
+use bumpalo::Bump;
+use micromap::Map;
+use rust_decimal::{prelude::ToPrimitive, Decimal, MathematicalOps};
+use rustc_hash::FxHashMap;
+use smol_str::{SmolStr, StrExt};
+
+/// Type alias for external (host) functions
+pub type ExternalFn = Box Result>;
+
+/// Type alias for external (host) methods on Value types
+pub type ExternalMethod = Box Result>;
+
+use super::debug_info::DebugInfo;
+use super::error::VMError;
+
+/// Maximum number of registers
+pub const MAX_REGISTERS: usize = 8;
+
+#[cfg(debug_assertions)]
+macro_rules! log_debug {
+  ($vm:expr, $($arg:tt)*) => {
+    if $vm.debug {
+      println!($($arg)*);
+    }
+  };
+}
+
+#[cfg(not(debug_assertions))]
+macro_rules! log_debug {
+  ($vm:expr, $($arg:tt)*) => {};
+}
+
+/// Virtual Machine for executing dExpr bytecode
+pub struct VM<'a> {
+  bytecode: &'a [u8],         // Bytecode to execute
+  reader: BytecodeReader<'a>, // Bytecode reader
+  pc: usize,                  // Program counter
+
+  // Registers for computation
+  registers: [Value; MAX_REGISTERS],
+
+  // Global variables
+  globals: Map,
+
+  // Last expression result (returned by execute)
+  last_result: Value,
+
+  // External (host) functions — lazily allocated
+  external_functions: Option>,
+
+  // External (host) methods per type — lazily allocated
+  external_methods: Option>,
+
+  // Heap for complex data types
+  heap: Bump,
+
+  // Debug info for error messages
+  debug_info: Option<&'a DebugInfo>,
+
+  // Debug flag
+  #[cfg(debug_assertions)]
+  debug: bool,
+
+  // Profiling counts
+  #[cfg(debug_assertions)]
+  opcode_counts: [usize; 256],
+}
+
+impl<'a> VM<'a> {
+  /// Create a new VM instance
+  pub fn new(bytecode: &'a [u8]) -> Self {
+    Self {
+      bytecode,
+      reader: BytecodeReader::new(bytecode),
+      pc: 0,
+      registers: [const { Value::Null }; MAX_REGISTERS],
+      globals: Map::new(),
+      last_result: Value::Null,
+      external_functions: None,
+      external_methods: None,
+      heap: Bump::new(),
+      debug_info: None,
+      #[cfg(debug_assertions)]
+      debug: false,
+      #[cfg(debug_assertions)]
+      opcode_counts: [0; 256],
+    }
+  }
+
+  /// Set debug info for better error messages
+  pub fn set_debug_info(&mut self, debug_info: &'a DebugInfo) {
+    self.debug_info = Some(debug_info);
+  }
+
+  /// Wrap an error with source location if debug info is available
+  fn wrap_error(&self, err: VMError) -> VMError {
+    if let Some(debug_info) = self.debug_info {
+      if let Some(span) = debug_info.get_span(self.pc as u32) {
+        return err.with_span(span);
+      }
+    }
+    err
+  }
+
+  /// Set a global variable
+  #[inline(never)]
+  pub fn set_global(&mut self, name: &str, value: Value) {
+    self.globals.insert(name.into(), value);
+  }
+
+  /// Get a global variable
+  pub fn get_global(&self, name: &str) -> Option<&Value> {
+    self.globals.get(name)
+  }
+
+  /// Register an external (host) function
+  pub fn register_function(&mut self, name: &str, f: F)
+  where
+    F: Fn(&[Value]) -> Result + 'static,
+  {
+    self
+      .external_functions
+      .get_or_insert_with(FxHashMap::default)
+      .insert(name.into(), Box::new(f));
+  }
+
+  /// Register an external (host) method on a specific type
+  pub fn register_method(&mut self, type_name: &str, method_name: &str, f: F)
+  where
+    F: Fn(&Value, &[Value]) -> Result + 'static,
+  {
+    self
+      .external_methods
+      .get_or_insert_with(FxHashMap::default)
+      .insert((type_name.into(), method_name.into()), Box::new(f));
+  }
+
+  /// Enable/disable debug output
+  #[cfg(debug_assertions)]
+  pub fn set_debug(&mut self, debug: bool) {
+    self.debug = debug;
+  }
+
+  /// Enable/disable debug output (no-op in release)
+  #[cfg(not(debug_assertions))]
+  pub fn set_debug(&mut self, _debug: bool) {}
+
+  /// Reset the VM state
+  pub fn reset(&mut self) {
+    self.reader = BytecodeReader::new(self.bytecode);
+    self.pc = 0;
+    self.registers = [const { Value::Null }; MAX_REGISTERS];
+    self.last_result = Value::Null;
+    // Preserve globals
+    self.heap = Bump::new();
+  }
+
+  /// Execute the bytecode program and return the last expression result
+  pub fn execute(&mut self) -> Result {
+    self.reset();
+
+    while self.reader.remaining() > 0 {
+      #[cfg(debug_assertions)]
+      self.debug_print_state();
+
+      // Store instruction position for error reporting
+      self.pc = self.reader.position();
+
+      let opcode_byte = self
+        .reader
+        .read_byte()
+        .map_err(|e| self.wrap_error(VMError::BytecodeError(e)))?;
+
+      #[cfg(debug_assertions)]
+      {
+        self.opcode_counts[opcode_byte as usize] += 1;
+      }
+
+      // Skip 0x00 bytes (treat as NOP)
+      if opcode_byte == 0x00 {
+        log_debug!(self, "Skipping NOP (0x00)");
+        continue;
+      }
+
+      let opcode = OpCodeByte::from_byte(opcode_byte)
+        .ok_or_else(|| self.wrap_error(VMError::BytecodeError(format!("Invalid opcode: {:02x}", opcode_byte))))?;
+
+      log_debug!(self, "Executing: {:?}", opcode.name());
+
+      let result = match opcode {
+        OpCodeByte::LoadConst => self.handle_load_const(),
+        OpCodeByte::Move => self.handle_move(),
+        OpCodeByte::LoadLocal => self.handle_load_local(),
+        OpCodeByte::StoreLocal => self.handle_store_local(),
+        OpCodeByte::LoadGlobal => self.handle_load_global(),
+        OpCodeByte::StoreGlobal => self.handle_store_global(),
+        OpCodeByte::Add => self.binary_op(|a, b| Ok(a + b), "add"),
+        OpCodeByte::Sub => self.binary_op(|a, b| Ok(a - b), "subtract"),
+        OpCodeByte::Mul => self.binary_op(|a, b| Ok(a * b), "multiply"),
+        OpCodeByte::Div => self.binary_op(
+          |a, b| {
+            if b.is_zero() {
+              Err(VMError::DivisionByZero)
+            } else {
+              Ok(a / b)
+            }
+          },
+          "divide",
+        ),
+        OpCodeByte::Neg => self.handle_neg(),
+        OpCodeByte::Mod => self.binary_op(
+          |a, b| {
+            if b.is_zero() {
+              Err(VMError::DivisionByZero)
+            } else {
+              Ok(a % b)
+            }
+          },
+          "modulo",
+        ),
+        OpCodeByte::Pow => self.binary_op(|a, b| Ok(a.powd(b)), "power"),
+        OpCodeByte::Lt => self.compare_op(|a, b| a < b, "less than"),
+        OpCodeByte::Lte => self.compare_op(|a, b| a <= b, "less than or equal"),
+        OpCodeByte::Gt => self.compare_op(|a, b| a > b, "greater than"),
+        OpCodeByte::Gte => self.compare_op(|a, b| a >= b, "greater than or equal"),
+        OpCodeByte::Eq => self.compare_op(|a, b| a == b, "equal"),
+        OpCodeByte::Neq => self.compare_op(|a, b| a != b, "not equal"),
+        OpCodeByte::Contains => self.handle_contains(),
+        OpCodeByte::And => self.handle_and(),
+        OpCodeByte::Or => self.handle_or(),
+        OpCodeByte::Not => self.handle_not(),
+        OpCodeByte::Jump => self.handle_jump(),
+        OpCodeByte::JumpIfFalse => self.handle_jump_if_false(),
+        OpCodeByte::Concat => self.handle_concat(),
+        OpCodeByte::GetProperty => self.handle_get_property(),
+        OpCodeByte::SetProperty => self.handle_set_property(),
+        OpCodeByte::MethodCall => self.handle_method_call(),
+        OpCodeByte::Log => self.handle_log(),
+        OpCodeByte::CallExternal => self.handle_call_external(),
+        OpCodeByte::CallDefault => self.handle_call_default(),
+        OpCodeByte::SetResult => self.handle_set_result(),
+        OpCodeByte::End => {
+          log_debug!(self, "End of program");
+          #[cfg(debug_assertions)]
+          self.print_profile_summary();
+          return Ok(std::mem::take(&mut self.last_result));
+        }
+      };
+
+      // Wrap any error with source location
+      result.map_err(|e| self.wrap_error(e))?;
+    }
+
+    #[cfg(debug_assertions)]
+    self.print_profile_summary();
+    Ok(std::mem::take(&mut self.last_result))
+  }
+
+  #[cfg(debug_assertions)]
+  fn print_profile_summary(&self) {
+    if !self.debug {
+      return;
+    }
+    println!("\n--- VM Opcode Profile ---");
+    let mut counts: Vec<(u8, usize)> = self
+      .opcode_counts
+      .iter()
+      .enumerate()
+      .filter(|(_, &count)| count > 0)
+      .map(|(op, &count)| (op as u8, count))
+      .collect();
+
+    counts.sort_by(|a, b| b.1.cmp(&a.1));
+
+    for (op_byte, count) in counts {
+      if let Some(opcode) = OpCodeByte::from_byte(op_byte) {
+        println!("{:?}: {}", opcode.name(), count);
+      } else {
+        println!("0x{:02x}: {}", op_byte, count);
+      }
+    }
+    println!("-------------------------\n");
+  }
+
+  // ============================================================================
+  // Helper Methods - Bytecode Reading & Validation
+  // ============================================================================
+
+  /// Read and validate a register index
+  #[inline(always)]
+  fn read_register_checked(&mut self) -> Result {
+    let reg = self
+      .reader
+      .read_register()
+      .map_err(VMError::BytecodeError)? as usize;
+    self.validate_register(reg)?;
+    Ok(reg)
+  }
+
+  /// Validate that a register index is within bounds
+  #[inline(always)]
+  fn validate_register(&self, _reg: usize) -> Result<(), VMError> {
+    #[cfg(debug_assertions)]
+    if _reg >= MAX_REGISTERS {
+      return Err(VMError::RuntimeError(format!("Invalid register: {}", _reg)));
+    }
+    Ok(())
+  }
+
+  /// Read and validate a jump address
+  #[inline(always)]
+  fn read_jump_address(&mut self) -> Result {
+    let addr = self
+      .reader
+      .read_u32()
+      .map_err(VMError::BytecodeError)? as usize;
+    #[cfg(debug_assertions)]
+    if addr >= self.bytecode.len() {
+      return Err(VMError::RuntimeError(format!(
+        "Jump target out of range: {}",
+        addr
+      )));
+    }
+    Ok(addr)
+  }
+
+  /// Set reader position with validation
+  #[inline(always)]
+  fn set_position(&mut self, addr: usize) -> Result<(), VMError> {
+    self
+      .reader
+      .set_position(addr)
+      .map_err(VMError::BytecodeError)
+  }
+
+  // ============================================================================
+  // Helper Methods - Debug Output
+  // ============================================================================
+
+  /// Print debug state information
+  #[cfg(debug_assertions)]
+  fn debug_print_state(&self) {
+    if self.debug {
+      println!(
+        "PC: {}",
+        self.reader.position(),
+      );
+      println!("Registers: {:?}", self.registers);
+    }
+  }
+
+  // ============================================================================
+  // Opcode Handlers - Register Operations
+  // ============================================================================
+
+  /// Handle LoadConst opcode - load constant value into register
+  #[inline]
+  fn handle_load_const(&mut self) -> Result<(), VMError> {
+    let reg = self.read_register_checked()?;
+    let value = self.reader.read_value().map_err(VMError::BytecodeError)?;
+    self.registers[reg] = value;
+
+    log_debug!(self, "LoadConst r{} = {:?}", reg, self.registers[reg]);
+    Ok(())
+  }
+
+  /// Handle Move opcode - copy register to register
+  #[inline]
+  fn handle_move(&mut self) -> Result<(), VMError> {
+    let dest = self.read_register_checked()?;
+    let src = self.read_register_checked()?;
+    self.registers[dest] = self.registers[src].clone();
+
+    log_debug!(self, "Move r{} = r{} ({})", dest, src, self.registers[dest]);
+    Ok(())
+  }
+
+  // ============================================================================
+  // Opcode Handlers - Memory Operations
+  // ============================================================================
+
+  /// Handle LoadLocal opcode - load local variable from stack
+  #[inline]
+  fn handle_load_local(&mut self) -> Result<(), VMError> {
+    let _reg = self.read_register_checked()?;
+    let _offset = self
+      .reader
+      .read_byte()
+      .map_err(VMError::BytecodeError)?;
+    Err(VMError::RuntimeError("LoadLocal not supported without function scope".to_string()))
+  }
+
+  /// Handle StoreLocal opcode - store register to local variable
+  #[inline]
+  fn handle_store_local(&mut self) -> Result<(), VMError> {
+    let _offset = self
+      .reader
+      .read_byte()
+      .map_err(VMError::BytecodeError)?;
+    let _reg = self.read_register_checked()?;
+    Err(VMError::RuntimeError("StoreLocal not supported without function scope".to_string()))
+  }
+
+  /// Handle LoadGlobal opcode - load global variable
+  #[inline]
+  fn handle_load_global(&mut self) -> Result<(), VMError> {
+    let reg = self.read_register_checked()?;
+    let name = self.reader.read_string().map_err(VMError::BytecodeError)?;
+
+    let value = self
+      .globals
+      .get(&name)
+      .ok_or_else(|| VMError::UndefinedVariable(name.clone()))?;
+    self.registers[reg] = value.clone();
+
+    log_debug!(self,
+      "LoadGlobal r{} = global.{} ({})",
+      reg, name, self.registers[reg]
+    );
+    Ok(())
+  }
+
+  /// Handle StoreGlobal opcode - store register to global variable
+  #[inline]
+  fn handle_store_global(&mut self) -> Result<(), VMError> {
+    let name = self.reader.read_string().map_err(VMError::BytecodeError)?;
+    let reg = self.read_register_checked()?;
+
+    self
+      .globals
+      .insert(name.clone(), self.registers[reg].clone());
+
+    log_debug!(self,
+      "StoreGlobal global.{} = r{} ({})",
+      name, reg, self.registers[reg]
+    );
+    Ok(())
+  }
+
+  // ============================================================================
+  // Opcode Handlers - Arithmetic Operations
+  // ============================================================================
+
+  /// Handle Neg opcode - unary negation
+  #[inline]
+  fn handle_neg(&mut self) -> Result<(), VMError> {
+    let dest = self.read_register_checked()?;
+    let src = self.read_register_checked()?;
+
+    match &self.registers[src] {
+      Value::Number(n) => {
+        self.registers[dest] = Value::Number(-n);
+      }
+      v => {
+        return Err(VMError::TypeMismatch {
+          expected: "Number".to_string(),
+          got: v.type_name().to_string(),
+        });
+      }
+    }
+
+    log_debug!(self, "Neg r{} = -r{}", dest, src);
+    Ok(())
+  }
+
+  // ============================================================================
+  // Opcode Handlers - Boolean Operations
+  // ============================================================================
+
+  /// Handle And opcode - boolean AND
+  #[inline]
+  fn handle_and(&mut self) -> Result<(), VMError> {
+    let dest = self.read_register_checked()?;
+    let a = self.read_register_checked()?;
+    let b = self.read_register_checked()?;
+
+    match (&self.registers[a], &self.registers[b]) {
+      (Value::Boolean(a_bool), Value::Boolean(b_bool)) => {
+        self.registers[dest] = Value::Boolean(*a_bool && *b_bool);
+      }
+      (a_val, b_val) => {
+        return Err(VMError::InvalidOperation {
+          operation: "and",
+          left_type: a_val.type_name(),
+          right_type: b_val.type_name(),
+        });
+      }
+    }
+
+    log_debug!(self, "And r{} = r{} && r{}", dest, a, b);
+    Ok(())
+  }
+
+  /// Handle Or opcode - boolean OR
+  #[inline]
+  fn handle_or(&mut self) -> Result<(), VMError> {
+    let dest = self.read_register_checked()?;
+    let a = self.read_register_checked()?;
+    let b = self.read_register_checked()?;
+
+    match (&self.registers[a], &self.registers[b]) {
+      (Value::Boolean(a_bool), Value::Boolean(b_bool)) => {
+        self.registers[dest] = Value::Boolean(*a_bool || *b_bool);
+      }
+      (a_val, b_val) => {
+        return Err(VMError::InvalidOperation {
+          operation: "or",
+          left_type: a_val.type_name(),
+          right_type: b_val.type_name(),
+        });
+      }
+    }
+
+    log_debug!(self, "Or r{} = r{} || r{}", dest, a, b);
+    Ok(())
+  }
+
+  /// Handle Not opcode - boolean NOT
+  #[inline]
+  fn handle_not(&mut self) -> Result<(), VMError> {
+    let dest = self.read_register_checked()?;
+    let src = self.read_register_checked()?;
+
+    match &self.registers[src] {
+      Value::Boolean(b) => {
+        self.registers[dest] = Value::Boolean(!b);
+      }
+      v => {
+        return Err(VMError::TypeMismatch {
+          expected: "Boolean".to_string(),
+          got: v.type_name().to_string(),
+        });
+      }
+    }
+
+    log_debug!(self, "Not r{} = !r{}", dest, src);
+    Ok(())
+  }
+
+  /// Handle Contains opcode - membership test (value in collection)
+  #[inline]
+  fn handle_contains(&mut self) -> Result<(), VMError> {
+    let dest = self.read_register_checked()?;
+    let needle = self.read_register_checked()?;
+    let haystack = self.read_register_checked()?;
+
+    let result = match (&self.registers[needle], &self.registers[haystack]) {
+      // String in StringList
+      (Value::String(s), Value::StringList(list)) => list.contains(s),
+      // Number in NumberList
+      (Value::Number(n), Value::NumberList(list)) => list.contains(n),
+      // String in String (substring check)
+      (Value::String(needle_str), Value::String(haystack_str)) => {
+        haystack_str.contains(needle_str.as_str())
+      }
+      // String in Object (key check)
+      (Value::String(key), Value::Object(map)) => map.contains_key(key),
+      (needle_val, haystack_val) => {
+        return Err(VMError::InvalidOperation {
+          operation: "in",
+          left_type: needle_val.type_name(),
+          right_type: haystack_val.type_name(),
+        });
+      }
+    };
+
+    self.registers[dest] = Value::Boolean(result);
+    log_debug!(self, "Contains r{} = r{} in r{}", dest, needle, haystack);
+    Ok(())
+  }
+
+  // ============================================================================
+  // Opcode Handlers - Control Flow
+  // ============================================================================
+
+  /// Handle Jump opcode - unconditional jump
+  #[inline]
+  fn handle_jump(&mut self) -> Result<(), VMError> {
+    let addr = self.read_jump_address()?;
+    self.set_position(addr)?;
+
+    log_debug!(self, "Jump to {}", addr);
+    Ok(())
+  }
+
+  /// Handle JumpIfFalse opcode - conditional jump
+  #[inline]
+  fn handle_jump_if_false(&mut self) -> Result<(), VMError> {
+    let cond_reg = self.read_register_checked()?;
+    let addr = self.read_jump_address()?;
+
+    match &self.registers[cond_reg] {
+      Value::Boolean(condition) => {
+        if !condition {
+          self.set_position(addr)?;
+          log_debug!(self, "JumpIfFalse to {} (condition=false)", addr);
+        } else {
+          log_debug!(self, "JumpIfFalse not taken (condition=true)");
+        }
+      }
+      v => {
+        return Err(VMError::TypeMismatch {
+          expected: "Boolean".to_string(),
+          got: v.type_name().to_string(),
+        });
+      }
+    }
+
+    Ok(())
+  }
+
+  // ============================================================================
+  // Opcode Handlers - String Operations
+  // ============================================================================
+
+  /// Handle Concat opcode - string concatenation
+  #[inline]
+  fn handle_concat(&mut self) -> Result<(), VMError> {
+    let dest = self.read_register_checked()?;
+    let a = self.read_register_checked()?;
+    let b = self.read_register_checked()?;
+
+    match (&self.registers[a], &self.registers[b]) {
+      (Value::String(a_str), Value::String(b_str)) => {
+        let result = format!("{}{}", a_str, b_str);
+        self.registers[dest] = Value::String(result.into());
+      }
+      (a_val, b_val) => {
+        return Err(VMError::InvalidOperation {
+          operation: "concat",
+          left_type: a_val.type_name(),
+          right_type: b_val.type_name(),
+        });
+      }
+    }
+
+    log_debug!(self, "Concat r{} = r{} + r{}", dest, a, b);
+    Ok(())
+  }
+
+  /// Handle GetProperty opcode - read a field from an Object
+  fn handle_get_property(&mut self) -> Result<(), VMError> {
+    let dest = self.read_register_checked()?;
+    let obj = self.read_register_checked()?;
+    let prop = self.reader.read_string().map_err(VMError::BytecodeError)?;
+
+    match &self.registers[obj] {
+      Value::Object(map) => {
+        let value = map.get(&prop).cloned().unwrap_or(Value::Null);
+        self.registers[dest] = value;
+      }
+      other => {
+        return Err(VMError::RuntimeError(format!(
+          "Cannot access property '{}' on type {}",
+          prop,
+          other.type_name()
+        )));
+      }
+    }
+    log_debug!(self, "GetProperty r{} = r{}.{}", dest, obj, prop);
+    Ok(())
+  }
+
+  /// Handle SetProperty opcode - set a field on an Object (in-place on register)
+  fn handle_set_property(&mut self) -> Result<(), VMError> {
+    let obj = self.read_register_checked()?;
+    let prop = self.reader.read_string().map_err(VMError::BytecodeError)?;
+    let val = self.read_register_checked()?;
+
+    let value = self.registers[val].clone();
+    match &mut self.registers[obj] {
+      Value::Object(map) => {
+        map.insert(prop.clone(), value);
+      }
+      other => {
+        return Err(VMError::RuntimeError(format!(
+          "Cannot set property '{}' on type {}",
+          prop,
+          other.type_name()
+        )));
+      }
+    }
+    log_debug!(self, "SetProperty r{}.{} = r{}", obj, prop, val);
+    Ok(())
+  }
+
+  /// Handle MethodCall opcode - method call on object
+  fn handle_method_call(&mut self) -> Result<(), VMError> {
+    let dest = self.read_register_checked()?;
+    let obj = self.read_register_checked()?;
+    let method = self.reader.read_string().map_err(VMError::BytecodeError)?;
+
+    // Read argument registers
+    let arg_count = self
+      .reader
+      .read_byte()
+      .map_err(VMError::BytecodeError)? as usize;
+    let mut args = Vec::with_capacity(arg_count);
+
+    for _ in 0..arg_count {
+      let reg = self.read_register_checked()?;
+      args.push(self.registers[reg].clone());
+    }
+
+    // Dispatch method call
+    match &self.registers[obj] {
+      Value::String(s) => match method.as_str() {
+        "upper" => {
+          let result = s.to_uppercase_smolstr();
+          self.registers[dest] = Value::String(result);
+        }
+        "lower" => {
+          let result = s.to_lowercase_smolstr();
+          self.registers[dest] = Value::String(result);
+        }
+        "trim" => {
+          let result = SmolStr::new(s.trim());
+          self.registers[dest] = Value::String(result);
+        }
+        "trimStart" => {
+          let result = SmolStr::new(s.trim_start());
+          self.registers[dest] = Value::String(result);
+        }
+        "trimEnd" => {
+          let result = SmolStr::new(s.trim_end());
+          self.registers[dest] = Value::String(result);
+        }
+        "split" => {
+          if args.is_empty() {
+            return Err(VMError::RuntimeError(
+              "split() requires a delimiter argument".to_string(),
+            ));
+          }
+          match &args[0] {
+            Value::String(delim) => {
+              let parts: Vec = s.split(delim.as_str()).map(SmolStr::new).collect();
+              self.registers[dest] = Value::StringList(parts);
+            }
+            _ => {
+              return Err(VMError::RuntimeError(
+                "split() requires a string delimiter".to_string(),
+              ));
+            }
+          }
+        }
+        "replace" => {
+          if args.len() < 2 {
+            return Err(VMError::RuntimeError(
+              "replace() requires two arguments (old, new)".to_string(),
+            ));
+          }
+          match (&args[0], &args[1]) {
+            (Value::String(old), Value::String(new)) => {
+              let result = SmolStr::new(s.replace(old.as_str(), new.as_str()));
+              self.registers[dest] = Value::String(result);
+            }
+            _ => {
+              return Err(VMError::RuntimeError(
+                "replace() requires string arguments".to_string(),
+              ));
+            }
+          }
+        }
+        "startsWith" => {
+          if args.is_empty() {
+            return Err(VMError::RuntimeError(
+              "startsWith() requires a prefix argument".to_string(),
+            ));
+          }
+          match &args[0] {
+            Value::String(prefix) => {
+              let result = s.starts_with(prefix.as_str());
+              self.registers[dest] = Value::Boolean(result);
+            }
+            _ => {
+              return Err(VMError::RuntimeError(
+                "startsWith() requires a string prefix".to_string(),
+              ));
+            }
+          }
+        }
+        "endsWith" => {
+          if args.is_empty() {
+            return Err(VMError::RuntimeError(
+              "endsWith() requires a suffix argument".to_string(),
+            ));
+          }
+          match &args[0] {
+            Value::String(suffix) => {
+              let result = s.ends_with(suffix.as_str());
+              self.registers[dest] = Value::Boolean(result);
+            }
+            _ => {
+              return Err(VMError::RuntimeError(
+                "endsWith() requires a string suffix".to_string(),
+              ));
+            }
+          }
+        }
+        "contains" => {
+          if args.is_empty() {
+            return Err(VMError::RuntimeError(
+              "contains() requires a substring argument".to_string(),
+            ));
+          }
+          match &args[0] {
+            Value::String(substr) => {
+              let result = s.contains(substr.as_str());
+              self.registers[dest] = Value::Boolean(result);
+            }
+            _ => {
+              return Err(VMError::RuntimeError(
+                "contains() requires a string substring".to_string(),
+              ));
+            }
+          }
+        }
+        "length" => {
+          let len = Decimal::from(s.len());
+          self.registers[dest] = Value::Number(len);
+        }
+        "charAt" => {
+          if args.is_empty() {
+            return Err(VMError::RuntimeError(
+              "charAt() requires an index argument".to_string(),
+            ));
+          }
+          match &args[0] {
+            Value::Number(idx) => {
+              let index = idx.to_u64().unwrap_or(u64::MAX) as usize;
+              match s.chars().nth(index) {
+                Some(c) => {
+                  self.registers[dest] = Value::String(SmolStr::new(c.to_string()));
+                }
+                None => {
+                  self.registers[dest] = Value::Null;
+                }
+              }
+            }
+            _ => {
+              return Err(VMError::RuntimeError(
+                "charAt() requires a number index".to_string(),
+              ));
+            }
+          }
+        }
+        "substring" => {
+          if args.is_empty() {
+            return Err(VMError::RuntimeError(
+              "substring() requires at least a start index".to_string(),
+            ));
+          }
+          match &args[0] {
+            Value::Number(start_idx) => {
+              let start = start_idx.to_usize().unwrap_or(0);
+              let chars: Vec = s.chars().collect();
+              let end = if args.len() > 1 {
+                match &args[1] {
+                  Value::Number(end_idx) => end_idx.to_usize().unwrap_or(chars.len()),
+                  _ => chars.len(),
+                }
+              } else {
+                chars.len()
+              };
+
+              if start >= chars.len() || start >= end {
+                self.registers[dest] = Value::String(SmolStr::new(""));
+              } else {
+                let end = end.min(chars.len());
+                let result: String = chars[start..end].iter().collect();
+                self.registers[dest] = Value::String(SmolStr::new(result));
+              }
+            }
+            _ => {
+              return Err(VMError::RuntimeError(
+                "substring() requires a number start index".to_string(),
+              ));
+            }
+          }
+        }
+        _ => {
+          let key = (SmolStr::new_static("String"), method.clone());
+          if let Some(ext_method) = self.external_methods.as_ref().and_then(|m| m.get(&key)) {
+            let obj_val = &self.registers[obj];
+            let result = ext_method(obj_val, &args).map_err(VMError::RuntimeError)?;
+            self.registers[dest] = result;
+          } else {
+            return Err(VMError::MethodNotFound {
+              type_name: "String",
+              method,
+            });
+          }
+        }
+      },
+      Value::StringList(list) => match method.as_str() {
+        "length" | "len" => {
+          self.registers[dest] = Value::Number(Decimal::from(list.len()));
+        }
+        "isEmpty" => {
+          self.registers[dest] = Value::Boolean(list.is_empty());
+        }
+        "first" => {
+          self.registers[dest] = list
+            .first()
+            .map(|s| Value::String(s.clone()))
+            .unwrap_or(Value::Null);
+        }
+        "last" => {
+          self.registers[dest] = list
+            .last()
+            .map(|s| Value::String(s.clone()))
+            .unwrap_or(Value::Null);
+        }
+        "get" => {
+          if args.is_empty() {
+            return Err(VMError::RuntimeError("get() requires an index".to_string()));
+          }
+          match &args[0] {
+            Value::Number(idx) => {
+              let index = idx.to_usize().unwrap_or(usize::MAX);
+              self.registers[dest] = list
+                .get(index)
+                .map(|s| Value::String(s.clone()))
+                .unwrap_or(Value::Null);
+            }
+            _ => return Err(VMError::RuntimeError("get() requires a number index".to_string())),
+          }
+        }
+        "contains" => {
+          if args.is_empty() {
+            return Err(VMError::RuntimeError("contains() requires an argument".to_string()));
+          }
+          match &args[0] {
+            Value::String(s) => {
+              self.registers[dest] = Value::Boolean(list.contains(s));
+            }
+            _ => return Err(VMError::RuntimeError("contains() requires a string argument".to_string())),
+          }
+        }
+        "indexOf" => {
+          if args.is_empty() {
+            return Err(VMError::RuntimeError("indexOf() requires an argument".to_string()));
+          }
+          match &args[0] {
+            Value::String(s) => {
+              let idx = list.iter().position(|item| item == s);
+              self.registers[dest] = idx
+                .map(|i| Value::Number(Decimal::from(i)))
+                .unwrap_or(Value::Number(Decimal::from(-1)));
+            }
+            _ => return Err(VMError::RuntimeError("indexOf() requires a string argument".to_string())),
+          }
+        }
+        "slice" => {
+          if args.is_empty() {
+            return Err(VMError::RuntimeError("slice() requires at least a start index".to_string()));
+          }
+          match &args[0] {
+            Value::Number(start_idx) => {
+              let start = start_idx.to_usize().unwrap_or(0).min(list.len());
+              let end = if args.len() > 1 {
+                match &args[1] {
+                  Value::Number(end_idx) => end_idx.to_usize().unwrap_or(list.len()).min(list.len()),
+                  _ => list.len(),
+                }
+              } else {
+                list.len()
+              };
+              self.registers[dest] = Value::StringList(list[start..end].to_vec());
+            }
+            _ => return Err(VMError::RuntimeError("slice() requires a number index".to_string())),
+          }
+        }
+        "reverse" => {
+          let mut reversed = list.clone();
+          reversed.reverse();
+          self.registers[dest] = Value::StringList(reversed);
+        }
+        "sort" => {
+          let mut sorted = list.clone();
+          sorted.sort();
+          self.registers[dest] = Value::StringList(sorted);
+        }
+        "join" => {
+          let delim = if args.is_empty() {
+            ""
+          } else {
+            match &args[0] {
+              Value::String(s) => s.as_str(),
+              _ => return Err(VMError::RuntimeError("join() requires a string delimiter".to_string())),
+            }
+          };
+          let result: String = list.iter().map(|s| s.as_str()).collect::>().join(delim);
+          self.registers[dest] = Value::String(SmolStr::new(result));
+        }
+        _ => {
+          let key = (SmolStr::new_static("StringList"), method.clone());
+          if let Some(ext_method) = self.external_methods.as_ref().and_then(|m| m.get(&key)) {
+            let obj_val = &self.registers[obj];
+            let result = ext_method(obj_val, &args).map_err(VMError::RuntimeError)?;
+            self.registers[dest] = result;
+          } else {
+            return Err(VMError::MethodNotFound {
+              type_name: "StringList",
+              method,
+            });
+          }
+        }
+      },
+      Value::NumberList(list) => match method.as_str() {
+        "length" | "len" => {
+          self.registers[dest] = Value::Number(Decimal::from(list.len()));
+        }
+        "isEmpty" => {
+          self.registers[dest] = Value::Boolean(list.is_empty());
+        }
+        "first" => {
+          self.registers[dest] = list
+            .first()
+            .map(|n| Value::Number(*n))
+            .unwrap_or(Value::Null);
+        }
+        "last" => {
+          self.registers[dest] = list
+            .last()
+            .map(|n| Value::Number(*n))
+            .unwrap_or(Value::Null);
+        }
+        "get" => {
+          if args.is_empty() {
+            return Err(VMError::RuntimeError("get() requires an index".to_string()));
+          }
+          match &args[0] {
+            Value::Number(idx) => {
+              let index = idx.to_usize().unwrap_or(usize::MAX);
+              self.registers[dest] = list
+                .get(index)
+                .map(|n| Value::Number(*n))
+                .unwrap_or(Value::Null);
+            }
+            _ => return Err(VMError::RuntimeError("get() requires a number index".to_string())),
+          }
+        }
+        "contains" => {
+          if args.is_empty() {
+            return Err(VMError::RuntimeError("contains() requires an argument".to_string()));
+          }
+          match &args[0] {
+            Value::Number(n) => {
+              self.registers[dest] = Value::Boolean(list.contains(n));
+            }
+            _ => return Err(VMError::RuntimeError("contains() requires a number argument".to_string())),
+          }
+        }
+        "indexOf" => {
+          if args.is_empty() {
+            return Err(VMError::RuntimeError("indexOf() requires an argument".to_string()));
+          }
+          match &args[0] {
+            Value::Number(n) => {
+              let idx = list.iter().position(|item| item == n);
+              self.registers[dest] = idx
+                .map(|i| Value::Number(Decimal::from(i)))
+                .unwrap_or(Value::Number(Decimal::from(-1)));
+            }
+            _ => return Err(VMError::RuntimeError("indexOf() requires a number argument".to_string())),
+          }
+        }
+        "slice" => {
+          if args.is_empty() {
+            return Err(VMError::RuntimeError("slice() requires at least a start index".to_string()));
+          }
+          match &args[0] {
+            Value::Number(start_idx) => {
+              let start = start_idx.to_usize().unwrap_or(0).min(list.len());
+              let end = if args.len() > 1 {
+                match &args[1] {
+                  Value::Number(end_idx) => end_idx.to_usize().unwrap_or(list.len()).min(list.len()),
+                  _ => list.len(),
+                }
+              } else {
+                list.len()
+              };
+              self.registers[dest] = Value::NumberList(list[start..end].to_vec());
+            }
+            _ => return Err(VMError::RuntimeError("slice() requires a number index".to_string())),
+          }
+        }
+        "reverse" => {
+          let mut reversed = list.clone();
+          reversed.reverse();
+          self.registers[dest] = Value::NumberList(reversed);
+        }
+        "sort" => {
+          let mut sorted = list.clone();
+          sorted.sort();
+          self.registers[dest] = Value::NumberList(sorted);
+        }
+        "sum" => {
+          let sum: Decimal = list.iter().sum();
+          self.registers[dest] = Value::Number(sum);
+        }
+        "avg" => {
+          if list.is_empty() {
+            self.registers[dest] = Value::Null;
+          } else {
+            let sum: Decimal = list.iter().sum();
+            let avg = sum / Decimal::from(list.len());
+            self.registers[dest] = Value::Number(avg);
+          }
+        }
+        "min" => {
+          self.registers[dest] = list
+            .iter()
+            .min()
+            .map(|n| Value::Number(*n))
+            .unwrap_or(Value::Null);
+        }
+        "max" => {
+          self.registers[dest] = list
+            .iter()
+            .max()
+            .map(|n| Value::Number(*n))
+            .unwrap_or(Value::Null);
+        }
+        _ => {
+          let key = (SmolStr::new_static("NumberList"), method.clone());
+          if let Some(ext_method) = self.external_methods.as_ref().and_then(|m| m.get(&key)) {
+            let obj_val = &self.registers[obj];
+            let result = ext_method(obj_val, &args).map_err(VMError::RuntimeError)?;
+            self.registers[dest] = result;
+          } else {
+            return Err(VMError::MethodNotFound {
+              type_name: "NumberList",
+              method,
+            });
+          }
+        }
+      },
+      Value::Object(map) => match method.as_str() {
+        "keys" => {
+          let keys: Vec = map.keys().cloned().collect();
+          self.registers[dest] = Value::StringList(keys);
+        }
+        "values" => {
+          // Returns a StringList if all values are strings, NumberList if all numbers, otherwise error
+          let vals: Vec = map.values().cloned().collect();
+          if vals.is_empty() {
+            self.registers[dest] = Value::StringList(Vec::new());
+          } else if vals.iter().all(|v| matches!(v, Value::String(_))) {
+            let strings: Vec = vals.into_iter().map(|v| match v {
+              Value::String(s) => s,
+              _ => unreachable!(),
+            }).collect();
+            self.registers[dest] = Value::StringList(strings);
+          } else if vals.iter().all(|v| matches!(v, Value::Number(_))) {
+            let numbers: Vec = vals.into_iter().map(|v| match v {
+              Value::Number(n) => n,
+              _ => unreachable!(),
+            }).collect();
+            self.registers[dest] = Value::NumberList(numbers);
+          } else {
+            return Err(VMError::RuntimeError(
+              "values() only works when all values are the same type (String or Number)".to_string(),
+            ));
+          }
+        }
+        "length" | "len" => {
+          self.registers[dest] = Value::Number(Decimal::from(map.len()));
+        }
+        "contains" => {
+          if args.is_empty() {
+            return Err(VMError::RuntimeError("contains() requires a key argument".to_string()));
+          }
+          match &args[0] {
+            Value::String(key) => {
+              self.registers[dest] = Value::Boolean(map.contains_key(key));
+            }
+            _ => return Err(VMError::RuntimeError("contains() requires a string key".to_string())),
+          }
+        }
+        "get" => {
+          if args.is_empty() {
+            return Err(VMError::RuntimeError("get() requires a key argument".to_string()));
+          }
+          match &args[0] {
+            Value::String(key) => {
+              self.registers[dest] = map.get(key).cloned().unwrap_or(Value::Null);
+            }
+            _ => return Err(VMError::RuntimeError("get() requires a string key".to_string())),
+          }
+        }
+        _ => {
+          let key = (SmolStr::new_static("Object"), method.clone());
+          if let Some(ext_method) = self.external_methods.as_ref().and_then(|m| m.get(&key)) {
+            let obj_val = &self.registers[obj];
+            let result = ext_method(obj_val, &args).map_err(VMError::RuntimeError)?;
+            self.registers[dest] = result;
+          } else {
+            return Err(VMError::MethodNotFound {
+              type_name: "Object",
+              method,
+            });
+          }
+        }
+      },
+      _ => {
+        // Try external methods for any type
+        let obj_val = &self.registers[obj];
+        let type_name: SmolStr = obj_val.type_name().into();
+        let key = (type_name.clone(), method.clone());
+        if let Some(ext_method) = self.external_methods.as_ref().and_then(|m| m.get(&key)) {
+          let result = ext_method(obj_val, &args).map_err(VMError::RuntimeError)?;
+          self.registers[dest] = result;
+        } else {
+          return Err(VMError::MethodNotFound {
+            type_name: obj_val.type_name(),
+            method,
+          });
+        }
+      }
+    }
+
+    log_debug!(self, "MethodCall r{} = r{}.{}(...)", dest, obj, method);
+    Ok(())
+  }
+
+  // ============================================================================
+  // Opcode Handlers - Built-in Functions
+  // ============================================================================
+
+  /// Handle CallDefault opcode - call a default (built-in) function by ID
+  fn handle_call_default(&mut self) -> Result<(), VMError> {
+    use crate::opcodes::default_fn;
+
+    let dest = self.read_register_checked()?;
+    let fn_id = self.reader.read_byte().map_err(VMError::BytecodeError)?;
+    let arg_count = self.reader.read_byte().map_err(VMError::BytecodeError)? as usize;
+
+    let mut arg_regs = Vec::with_capacity(arg_count);
+    for _ in 0..arg_count {
+      arg_regs.push(self.read_register_checked()?);
+    }
+
+    match fn_id {
+      default_fn::RAND => {
+        use rand::RngExt;
+        if arg_regs.len() < 2 {
+          return Err(VMError::RuntimeError("rand() requires two arguments (min, max)".to_string()));
+        }
+        match (&self.registers[arg_regs[0]], &self.registers[arg_regs[1]]) {
+          (Value::Number(min), Value::Number(max)) => {
+            let min_i64 = min.to_i64().ok_or_else(|| {
+              VMError::RuntimeError("rand() min must be an integer".to_string())
+            })?;
+            let max_i64 = max.to_i64().ok_or_else(|| {
+              VMError::RuntimeError("rand() max must be an integer".to_string())
+            })?;
+            if min_i64 > max_i64 {
+              return Err(VMError::RuntimeError("rand() min must be <= max".to_string()));
+            }
+            let mut rng = rand::rng();
+            let result = rng.random_range(min_i64..=max_i64);
+            self.registers[dest] = Value::Number(Decimal::from(result));
+          }
+          _ => return Err(VMError::RuntimeError("rand() requires number arguments".to_string())),
+        }
+      }
+      _ => {
+        let name = default_fn::name(fn_id)
+          .map(|s| s.to_string())
+          .unwrap_or_else(|| format!("unknown({})", fn_id));
+        return Err(VMError::RuntimeError(format!("Unknown default function: {}", name)));
+      }
+    }
+
+    log_debug!(self, "CallDefault r{} = fn#{}(...)", dest, fn_id);
+    Ok(())
+  }
+
+  /// Handle CallExternal opcode - call host function by name
+  fn handle_call_external(&mut self) -> Result<(), VMError> {
+    let dest = self.read_register_checked()?;
+    let name = self.reader.read_string().map_err(VMError::BytecodeError)?;
+    let arg_count = self.reader.read_byte().map_err(VMError::BytecodeError)? as usize;
+
+    let mut args = Vec::with_capacity(arg_count);
+    for _ in 0..arg_count {
+      let reg = self.read_register_checked()?;
+      args.push(self.registers[reg].clone());
+    }
+
+    let func = self
+      .external_functions
+      .as_ref()
+      .and_then(|m| m.get(&name))
+      .ok_or_else(|| VMError::RuntimeError(format!("Undefined function: {}", name)))?;
+
+    let result = func(&args).map_err(VMError::RuntimeError)?;
+    self.registers[dest] = result;
+
+    log_debug!(self, "CallExternal r{} = {}(...)", dest, name);
+    Ok(())
+  }
+
+  /// Handle SetResult opcode - store expression result
+  #[inline]
+  fn handle_set_result(&mut self) -> Result<(), VMError> {
+    let reg = self.read_register_checked()?;
+    // Take instead of clone — the register is freed right after this opcode
+    self.last_result = std::mem::take(&mut self.registers[reg]);
+    log_debug!(self, "SetResult = r{}", reg);
+    Ok(())
+  }
+
+  /// Handle Log opcode - print value to console
+  #[inline]
+  fn handle_log(&mut self) -> Result<(), VMError> {
+    let reg = self.read_register_checked()?;
+    println!("{}", self.registers[reg]);
+    log_debug!(self, "Log r{}", reg);
+    Ok(())
+  }
+
+  /// Helper for binary arithmetic operations
+  #[inline]
+  fn binary_op(&mut self, op: F, op_name: &'static str) -> Result<(), VMError>
+  where
+    F: FnOnce(Decimal, Decimal) -> Result,
+  {
+    let dest = self
+      .reader
+      .read_register()
+      .map_err(|e| VMError::BytecodeError(e))? as usize;
+    let a = self
+      .reader
+      .read_register()
+      .map_err(|e| VMError::BytecodeError(e))? as usize;
+    let b = self
+      .reader
+      .read_register()
+      .map_err(|e| VMError::BytecodeError(e))? as usize;
+
+    #[cfg(debug_assertions)]
+    if dest >= MAX_REGISTERS || a >= MAX_REGISTERS || b >= MAX_REGISTERS {
+      return Err(VMError::RuntimeError(format!(
+        "Invalid register: dest={}, a={}, b={}",
+        dest, a, b
+      )));
+    }
+
+    match (&self.registers[a], &self.registers[b]) {
+      (Value::Number(a_num), Value::Number(b_num)) => {
+        let result = op(*a_num, *b_num)?;
+        self.registers[dest] = Value::Number(result);
+      }
+      (a_val, b_val) => {
+        return Err(VMError::InvalidOperation {
+          operation: op_name,
+          left_type: a_val.type_name(),
+          right_type: b_val.type_name(),
+        });
+      }
+    }
+
+    log_debug!(self, "{} r{} = r{} {} r{}", op_name, dest, a, op_name, b);
+
+    Ok(())
+  }
+
+  /// Helper for comparison operations
+  #[inline]
+  fn compare_op(&mut self, op: F, op_name: &'static str) -> Result<(), VMError>
+  where
+    F: FnOnce(&Decimal, &Decimal) -> bool,
+  {
+    let dest = self
+      .reader
+      .read_register()
+      .map_err(|e| VMError::BytecodeError(e))? as usize;
+    let a = self
+      .reader
+      .read_register()
+      .map_err(|e| VMError::BytecodeError(e))? as usize;
+    let b = self
+      .reader
+      .read_register()
+      .map_err(|e| VMError::BytecodeError(e))? as usize;
+
+    #[cfg(debug_assertions)]
+    if dest >= MAX_REGISTERS || a >= MAX_REGISTERS || b >= MAX_REGISTERS {
+      return Err(VMError::RuntimeError(format!(
+        "Invalid register: dest={}, a={}, b={}",
+        dest, a, b
+      )));
+    }
+
+    match (&self.registers[a], &self.registers[b]) {
+      (Value::Number(a_num), Value::Number(b_num)) => {
+        let result = op(a_num, b_num);
+        self.registers[dest] = Value::Boolean(result);
+      }
+      (a_val, b_val) => {
+        return Err(VMError::InvalidOperation {
+          operation: op_name,
+          left_type: a_val.type_name(),
+          right_type: b_val.type_name(),
+        });
+      }
+    }
+
+    log_debug!(self, "{} r{} = r{} {} r{}", op_name, dest, a, op_name, b);
+
+    Ok(())
+  }
+}
diff --git a/tests/integration_tests.rs b/tests/integration_tests.rs
new file mode 100644
index 0000000..9b37de2
--- /dev/null
+++ b/tests/integration_tests.rs
@@ -0,0 +1,1344 @@
+use dexpr::{ast::value::Value, compiler::Compiler, parser, vm::VM};
+use indexmap::IndexMap;
+use rust_decimal::prelude::ToPrimitive;
+use rust_decimal_macros::dec;
+use smol_str::SmolStr;
+
+/// Helper to run code and get the value of "result" variable
+fn run_and_get_result(code: &str) -> Value {
+  let ast = parser::program(code).expect("Failed to parse");
+  let mut compiler = Compiler::new();
+  let bytecode = compiler.compile(ast).expect("Failed to compile");
+  let mut vm = VM::new(&bytecode);
+  vm.execute().expect("Failed to execute");
+  vm.get_global("result").expect("result not found").clone()
+}
+
+/// Helper to run code and return the expression result (last expression value)
+fn run_expr(code: &str) -> Value {
+  let ast = parser::program(code).expect("Failed to parse");
+  let mut compiler = Compiler::new();
+  let bytecode = compiler.compile(ast).expect("Failed to compile");
+  let mut vm = VM::new(&bytecode);
+  vm.execute().expect("Failed to execute")
+}
+
+/// Helper to run code with globals and get "result" variable
+fn run_and_get_result_with_globals(code: &str, globals: Vec<(&str, Value)>) -> Value {
+  let ast = parser::program(code).expect("Failed to parse");
+  let mut compiler = Compiler::new();
+  let bytecode = compiler.compile(ast).expect("Failed to compile");
+  let mut vm = VM::new(&bytecode);
+  for (name, value) in globals {
+    vm.set_global(name, value);
+  }
+  vm.execute().expect("Failed to execute");
+  vm.get_global("result").expect("result not found").clone()
+}
+
+/// Helper to run code with globals and return expression result
+fn run_expr_with_globals(code: &str, globals: Vec<(&str, Value)>) -> Value {
+  let ast = parser::program(code).expect("Failed to parse");
+  let mut compiler = Compiler::new();
+  let bytecode = compiler.compile(ast).expect("Failed to compile");
+  let mut vm = VM::new(&bytecode);
+  for (name, value) in globals {
+    vm.set_global(name, value);
+  }
+  vm.execute().expect("Failed to execute")
+}
+
+// ==================== MODULO OPERATOR TESTS ====================
+
+#[test]
+fn test_modulo_basic() {
+  let result = run_and_get_result("result = 10 % 3");
+  assert_eq!(result, Value::Number(dec!(1)));
+}
+
+#[test]
+fn test_modulo_zero_remainder() {
+  let result = run_and_get_result("result = 12 % 4");
+  assert_eq!(result, Value::Number(dec!(0)));
+}
+
+#[test]
+fn test_modulo_with_decimals() {
+  let result = run_and_get_result("result = 10.5 % 3");
+  assert_eq!(result, Value::Number(dec!(1.5)));
+}
+
+#[test]
+fn test_modulo_negative() {
+  // Rust remainder semantics: -7 % 3 = -1
+  let result = run_and_get_result("result = -7 % 3");
+  assert_eq!(result, Value::Number(dec!(-1)));
+}
+
+#[test]
+fn test_modulo_precedence() {
+  // % should have same precedence as * and /
+  // 10 + 7 % 3 = 10 + 1 = 11
+  let result = run_and_get_result("result = 10 + 7 % 3");
+  assert_eq!(result, Value::Number(dec!(11)));
+}
+
+// ==================== POWER OPERATOR TESTS ====================
+
+#[test]
+fn test_power_basic() {
+  let result = run_and_get_result("result = 2 ** 10");
+  assert_eq!(result, Value::Number(dec!(1024)));
+}
+
+#[test]
+fn test_power_square() {
+  let result = run_and_get_result("result = 5 ** 2");
+  assert_eq!(result, Value::Number(dec!(25)));
+}
+
+#[test]
+fn test_power_cube() {
+  let result = run_and_get_result("result = 3 ** 3");
+  assert_eq!(result, Value::Number(dec!(27)));
+}
+
+#[test]
+fn test_power_zero_exponent() {
+  let result = run_and_get_result("result = 5 ** 0");
+  assert_eq!(result, Value::Number(dec!(1)));
+}
+
+#[test]
+fn test_power_one_exponent() {
+  let result = run_and_get_result("result = 7 ** 1");
+  assert_eq!(result, Value::Number(dec!(7)));
+}
+
+#[test]
+fn test_power_right_associative() {
+  // 2 ** 3 ** 2 should be 2 ** (3 ** 2) = 2 ** 9 = 512 (right-associative)
+  let result = run_and_get_result("result = 2 ** 3 ** 2");
+  assert_eq!(result, Value::Number(dec!(512)));
+}
+
+#[test]
+fn test_power_precedence() {
+  // ** should have higher precedence than * and /
+  // 2 * 3 ** 2 = 2 * 9 = 18
+  let result = run_and_get_result("result = 2 * 3 ** 2");
+  assert_eq!(result, Value::Number(dec!(18)));
+}
+
+#[test]
+fn test_power_in_expression() {
+  // (2 + 3) ** 2 = 5 ** 2 = 25
+  let result = run_and_get_result("result = (2 + 3) ** 2");
+  assert_eq!(result, Value::Number(dec!(25)));
+}
+
+// ==================== COMBINED OPERATOR TESTS ====================
+
+#[test]
+fn test_modulo_and_power_together() {
+  // 2 ** 4 % 5 = 16 % 5 = 1
+  let result = run_and_get_result("result = 2 ** 4 % 5");
+  assert_eq!(result, Value::Number(dec!(1)));
+}
+
+#[test]
+fn test_complex_expression_with_new_ops() {
+  // (3 ** 2 + 4 ** 2) % 10 = (9 + 16) % 10 = 25 % 10 = 5
+  let result = run_and_get_result("result = (3 ** 2 + 4 ** 2) % 10");
+  assert_eq!(result, Value::Number(dec!(5)));
+}
+
+// ==================== COMPOUND ASSIGNMENT TESTS ====================
+
+#[test]
+fn test_compound_add() {
+  let result = run_and_get_result("x = 10\nx += 5\nresult = x");
+  assert_eq!(result, Value::Number(dec!(15)));
+}
+
+#[test]
+fn test_compound_sub() {
+  let result = run_and_get_result("x = 20\nx -= 7\nresult = x");
+  assert_eq!(result, Value::Number(dec!(13)));
+}
+
+#[test]
+fn test_compound_mul() {
+  let result = run_and_get_result("x = 3\nx *= 4\nresult = x");
+  assert_eq!(result, Value::Number(dec!(12)));
+}
+
+#[test]
+fn test_compound_div() {
+  let result = run_and_get_result("x = 100\nx /= 4\nresult = x");
+  assert_eq!(result, Value::Number(dec!(25)));
+}
+
+#[test]
+fn test_compound_mod() {
+  let result = run_and_get_result("x = 17\nx %= 5\nresult = x");
+  assert_eq!(result, Value::Number(dec!(2)));
+}
+
+#[test]
+fn test_compound_multiple_operations() {
+  let result = run_and_get_result(
+    "x = 10\nx += 5\nx *= 2\nx -= 10\nresult = x",
+  );
+  assert_eq!(result, Value::Number(dec!(20)));
+}
+
+#[test]
+fn test_compound_with_expression() {
+  let result = run_and_get_result("x = 10\nx += 3 * 2\nresult = x");
+  assert_eq!(result, Value::Number(dec!(16)));
+}
+
+#[test]
+fn test_compound_chained() {
+  let result = run_and_get_result(
+    "a = 5\nb = 10\na += 1\nb -= 2\nresult = a + b",
+  );
+  assert_eq!(result, Value::Number(dec!(14)));
+}
+
+// ==================== STRING METHOD TESTS ====================
+
+#[test]
+fn test_string_trim() {
+  let result = run_and_get_result(r#"result = "  hello  ".trim()"#);
+  assert_eq!(result, Value::String("hello".into()));
+}
+
+#[test]
+fn test_string_trim_start() {
+  let result = run_and_get_result(r#"result = "  hello  ".trimStart()"#);
+  assert_eq!(result, Value::String("hello  ".into()));
+}
+
+#[test]
+fn test_string_trim_end() {
+  let result = run_and_get_result(r#"result = "  hello  ".trimEnd()"#);
+  assert_eq!(result, Value::String("  hello".into()));
+}
+
+#[test]
+fn test_string_upper() {
+  let result = run_and_get_result(r#"result = "hello".upper()"#);
+  assert_eq!(result, Value::String("HELLO".into()));
+}
+
+#[test]
+fn test_string_lower() {
+  let result = run_and_get_result(r#"result = "HELLO".lower()"#);
+  assert_eq!(result, Value::String("hello".into()));
+}
+
+#[test]
+fn test_string_replace() {
+  let result = run_and_get_result(r#"result = "hello".replace("l", "x")"#);
+  assert_eq!(result, Value::String("hexxo".into()));
+}
+
+#[test]
+fn test_string_contains() {
+  let result = run_and_get_result(r#"result = "hello".contains("ell")"#);
+  assert_eq!(result, Value::Boolean(true));
+}
+
+#[test]
+fn test_string_contains_false() {
+  let result = run_and_get_result(r#"result = "hello".contains("xyz")"#);
+  assert_eq!(result, Value::Boolean(false));
+}
+
+#[test]
+fn test_string_starts_with() {
+  let result = run_and_get_result(r#"result = "hello".startsWith("hel")"#);
+  assert_eq!(result, Value::Boolean(true));
+}
+
+#[test]
+fn test_string_ends_with() {
+  let result = run_and_get_result(r#"result = "hello".endsWith("llo")"#);
+  assert_eq!(result, Value::Boolean(true));
+}
+
+#[test]
+fn test_string_length() {
+  let result = run_and_get_result(r#"result = "hello".length()"#);
+  assert_eq!(result, Value::Number(dec!(5)));
+}
+
+#[test]
+fn test_string_char_at() {
+  let result = run_and_get_result(r#"result = "hello".charAt(1)"#);
+  assert_eq!(result, Value::String("e".into()));
+}
+
+#[test]
+fn test_string_char_at_out_of_bounds() {
+  let result = run_and_get_result(r#"result = "hello".charAt(10)"#);
+  assert_eq!(result, Value::Null);
+}
+
+#[test]
+fn test_string_substring() {
+  let result = run_and_get_result(r#"result = "hello".substring(1, 4)"#);
+  assert_eq!(result, Value::String("ell".into()));
+}
+
+#[test]
+fn test_string_substring_to_end() {
+  let result = run_and_get_result(r#"result = "hello".substring(2)"#);
+  assert_eq!(result, Value::String("llo".into()));
+}
+
+#[test]
+fn test_string_split() {
+  let result = run_and_get_result(r#"
+parts = "a,b,c".split(",")
+result = parts.length()
+"#);
+  assert_eq!(result, Value::Number(dec!(3)));
+}
+
+// ==================== STRING LIST METHOD TESTS ====================
+
+#[test]
+fn test_stringlist_first() {
+  let result = run_and_get_result(r#"
+parts = "a,b,c".split(",")
+result = parts.first()
+"#);
+  assert_eq!(result, Value::String("a".into()));
+}
+
+#[test]
+fn test_stringlist_last() {
+  let result = run_and_get_result(r#"
+parts = "a,b,c".split(",")
+result = parts.last()
+"#);
+  assert_eq!(result, Value::String("c".into()));
+}
+
+#[test]
+fn test_stringlist_get() {
+  let result = run_and_get_result(r#"
+parts = "a,b,c".split(",")
+result = parts.get(1)
+"#);
+  assert_eq!(result, Value::String("b".into()));
+}
+
+#[test]
+fn test_stringlist_get_out_of_bounds() {
+  let result = run_and_get_result(r#"
+parts = "a,b,c".split(",")
+result = parts.get(10)
+"#);
+  assert_eq!(result, Value::Null);
+}
+
+#[test]
+fn test_stringlist_join() {
+  let result = run_and_get_result(r#"
+parts = "a,b,c".split(",")
+result = parts.join("-")
+"#);
+  assert_eq!(result, Value::String("a-b-c".into()));
+}
+
+#[test]
+fn test_stringlist_join_no_delimiter() {
+  let result = run_and_get_result(r#"
+parts = "a,b,c".split(",")
+result = parts.join()
+"#);
+  assert_eq!(result, Value::String("abc".into()));
+}
+// ==================== EXPRESSION RETURN VALUE TESTS ====================
+
+#[test]
+fn test_expr_return_single_expression() {
+  // Single-line expression should return its value
+  let result = run_expr("42 + 8");
+  assert_eq!(result, Value::Number(dec!(50)));
+}
+
+#[test]
+fn test_expr_return_formula() {
+  // Formula-style expression
+  let result = run_expr_with_globals(
+    "toplamTutar * kdv / 100",
+    vec![
+      ("toplamTutar", Value::Number(dec!(1000))),
+      ("kdv", Value::Number(dec!(18))),
+    ],
+  );
+  assert_eq!(result, Value::Number(dec!(180)));
+}
+
+#[test]
+fn test_expr_return_last_expression() {
+  // Multi-line: last expression statement wins
+  let result = run_expr("x = 10\ny = 20\nx + y");
+  assert_eq!(result, Value::Number(dec!(30)));
+}
+
+#[test]
+fn test_expr_return_assignment_then_expr() {
+  let result = run_expr("result = 42\nresult");
+  assert_eq!(result, Value::Number(dec!(42)));
+}
+
+#[test]
+fn test_expr_return_null_when_only_assignments() {
+  // Only assignments, no expression statement → Null
+  let result = run_expr("x = 10\ny = 20");
+  assert_eq!(result, Value::Null);
+}
+
+#[test]
+fn test_expr_return_string() {
+  let result = run_expr("\"hello\" + \" world\"");
+  assert_eq!(result, Value::String("hello world".into()));
+}
+
+#[test]
+fn test_expr_return_boolean() {
+  let result = run_expr("10 > 5");
+  assert_eq!(result, Value::Boolean(true));
+}
+
+// ==================== EXTERNAL FUNCTION TESTS ====================
+
+#[test]
+fn test_external_function_basic() {
+  let ast = parser::program("result = add(3, 4)").expect("parse");
+  let mut compiler = Compiler::new();
+  let bytecode = compiler.compile(ast).expect("compile");
+  let mut vm = VM::new(&bytecode);
+  vm.register_function("add", |args| {
+    match (&args[0], &args[1]) {
+      (Value::Number(a), Value::Number(b)) => Ok(Value::Number(a + b)),
+      _ => Err("expected numbers".to_string()),
+    }
+  });
+  vm.execute().expect("execute");
+  assert_eq!(vm.get_global("result").unwrap(), &Value::Number(dec!(7)));
+}
+
+#[test]
+fn test_external_function_no_args() {
+  let ast = parser::program("pi()").expect("parse");
+  let mut compiler = Compiler::new();
+  let bytecode = compiler.compile(ast).expect("compile");
+  let mut vm = VM::new(&bytecode);
+  vm.register_function("pi", |_args| {
+    Ok(Value::Number(dec!(3.14159)))
+  });
+  let result = vm.execute().expect("execute");
+  assert_eq!(result, Value::Number(dec!(3.14159)));
+}
+
+#[test]
+fn test_external_function_with_globals() {
+  let code = "getExchangeRate('USD')";
+  let ast = parser::program(code).expect("parse");
+  let mut compiler = Compiler::new();
+  let bytecode = compiler.compile(ast).expect("compile");
+  let mut vm = VM::new(&bytecode);
+  vm.register_function("getExchangeRate", |args| {
+    match &args[0] {
+      Value::String(currency) if currency.as_str() == "USD" => Ok(Value::Number(dec!(34.5))),
+      Value::String(currency) if currency.as_str() == "EUR" => Ok(Value::Number(dec!(37.2))),
+      _ => Err("unknown currency".to_string()),
+    }
+  });
+  let result = vm.execute().expect("execute");
+  assert_eq!(result, Value::Number(dec!(34.5)));
+}
+
+#[test]
+fn test_external_function_undefined_error() {
+  let ast = parser::program("unknownFn()").expect("parse");
+  let mut compiler = Compiler::new();
+  let bytecode = compiler.compile(ast).expect("compile");
+  let mut vm = VM::new(&bytecode);
+  let err = vm.execute().unwrap_err();
+  assert!(err.to_string().contains("Undefined function: unknownFn"));
+}
+
+#[test]
+fn test_external_function_in_formula() {
+  // Realistic pricing formula: base * exchangeRate * (1 + commission/100)
+  let code = "rate = getRate('USD')\nbase * rate * (1 + commission / 100)";
+  let ast = parser::program(code).expect("parse");
+  let mut compiler = Compiler::new();
+  let bytecode = compiler.compile(ast).expect("compile");
+  let mut vm = VM::new(&bytecode);
+  vm.set_global("base", Value::Number(dec!(100)));
+  vm.set_global("commission", Value::Number(dec!(5)));
+  vm.register_function("getRate", |args| {
+    match &args[0] {
+      Value::String(s) if s.as_str() == "USD" => Ok(Value::Number(dec!(34))),
+      _ => Err("unknown".to_string()),
+    }
+  });
+  let result = vm.execute().expect("execute");
+  assert_eq!(result, Value::Number(dec!(3570)));
+}
+
+// ==================== IN KEYWORD TESTS ====================
+
+#[test]
+fn test_in_string_in_stringlist() {
+  let result = run_and_get_result(r#"
+categories = "finans,teknoloji,saglik".split(",")
+result = "finans" in categories
+"#);
+  assert_eq!(result, Value::Boolean(true));
+}
+
+#[test]
+fn test_in_string_not_in_stringlist() {
+  let result = run_and_get_result(r#"
+categories = "finans,teknoloji,saglik".split(",")
+result = "spor" in categories
+"#);
+  assert_eq!(result, Value::Boolean(false));
+}
+
+#[test]
+fn test_in_string_in_string_substring() {
+  let result = run_expr("\"hello\" in \"hello world\"");
+  assert_eq!(result, Value::Boolean(true));
+}
+
+#[test]
+fn test_in_string_not_in_string() {
+  let result = run_expr("\"xyz\" in \"hello world\"");
+  assert_eq!(result, Value::Boolean(false));
+}
+
+#[test]
+fn test_in_with_if_statement() {
+  let result = run_and_get_result(r#"
+categories = "finans,teknoloji".split(",")
+if "finans" in categories then
+  result = "found"
+else
+  result = "not found"
+end
+"#);
+  assert_eq!(result, Value::String("found".into()));
+}
+
+// ==================== LIST METHOD EXPANSION TESTS ====================
+
+// StringList methods
+
+#[test]
+fn test_stringlist_contains() {
+  let result = run_and_get_result(r#"
+parts = "a,b,c".split(",")
+result = parts.contains("b")
+"#);
+  assert_eq!(result, Value::Boolean(true));
+}
+
+#[test]
+fn test_stringlist_contains_missing() {
+  let result = run_and_get_result(r#"
+parts = "a,b,c".split(",")
+result = parts.contains("z")
+"#);
+  assert_eq!(result, Value::Boolean(false));
+}
+
+#[test]
+fn test_stringlist_indexof() {
+  let result = run_and_get_result(r#"
+parts = "a,b,c".split(",")
+result = parts.indexOf("b")
+"#);
+  assert_eq!(result, Value::Number(dec!(1)));
+}
+
+#[test]
+fn test_stringlist_indexof_not_found() {
+  let result = run_and_get_result(r#"
+parts = "a,b,c".split(",")
+result = parts.indexOf("z")
+"#);
+  assert_eq!(result, Value::Number(dec!(-1)));
+}
+
+#[test]
+fn test_stringlist_slice() {
+  let result = run_and_get_result(r#"
+parts = "a,b,c,d".split(",")
+sliced = parts.slice(1, 3)
+result = sliced.join(",")
+"#);
+  assert_eq!(result, Value::String("b,c".into()));
+}
+
+#[test]
+fn test_stringlist_reverse() {
+  let result = run_and_get_result(r#"
+parts = "a,b,c".split(",")
+reversed = parts.reverse()
+result = reversed.join(",")
+"#);
+  assert_eq!(result, Value::String("c,b,a".into()));
+}
+
+#[test]
+fn test_stringlist_sort() {
+  let result = run_and_get_result(r#"
+parts = "c,a,b".split(",")
+sorted = parts.sort()
+result = sorted.join(",")
+"#);
+  assert_eq!(result, Value::String("a,b,c".into()));
+}
+
+#[test]
+fn test_stringlist_isempty() {
+  let result = run_and_get_result(r#"
+parts = "a,b".split(",")
+result = parts.isEmpty()
+"#);
+  assert_eq!(result, Value::Boolean(false));
+}
+
+// NumberList methods (using globals since we can't create NumberList literals yet)
+
+#[test]
+fn test_numberlist_contains() {
+  let ast = parser::program("result = nums.contains(3)").expect("parse");
+  let mut compiler = Compiler::new();
+  let bytecode = compiler.compile(ast).expect("compile");
+  let mut vm = VM::new(&bytecode);
+  vm.set_global("nums", Value::NumberList(vec![dec!(1), dec!(2), dec!(3), dec!(4)]));
+  vm.execute().expect("execute");
+  assert_eq!(vm.get_global("result").unwrap(), &Value::Boolean(true));
+}
+
+#[test]
+fn test_numberlist_indexof() {
+  let ast = parser::program("result = nums.indexOf(3)").expect("parse");
+  let mut compiler = Compiler::new();
+  let bytecode = compiler.compile(ast).expect("compile");
+  let mut vm = VM::new(&bytecode);
+  vm.set_global("nums", Value::NumberList(vec![dec!(1), dec!(2), dec!(3)]));
+  vm.execute().expect("execute");
+  assert_eq!(vm.get_global("result").unwrap(), &Value::Number(dec!(2)));
+}
+
+#[test]
+fn test_numberlist_slice() {
+  let ast = parser::program("sliced = nums.slice(1, 3)\nresult = sliced.sum()").expect("parse");
+  let mut compiler = Compiler::new();
+  let bytecode = compiler.compile(ast).expect("compile");
+  let mut vm = VM::new(&bytecode);
+  vm.set_global("nums", Value::NumberList(vec![dec!(10), dec!(20), dec!(30), dec!(40)]));
+  vm.execute().expect("execute");
+  // slice(1,3) = [20, 30], sum = 50
+  assert_eq!(vm.get_global("result").unwrap(), &Value::Number(dec!(50)));
+}
+
+#[test]
+fn test_numberlist_reverse() {
+  let ast = parser::program("reversed = nums.reverse()\nresult = reversed.first()").expect("parse");
+  let mut compiler = Compiler::new();
+  let bytecode = compiler.compile(ast).expect("compile");
+  let mut vm = VM::new(&bytecode);
+  vm.set_global("nums", Value::NumberList(vec![dec!(1), dec!(2), dec!(3)]));
+  vm.execute().expect("execute");
+  assert_eq!(vm.get_global("result").unwrap(), &Value::Number(dec!(3)));
+}
+
+#[test]
+fn test_numberlist_sort() {
+  let ast = parser::program("sorted = nums.sort()\nresult = sorted.first()").expect("parse");
+  let mut compiler = Compiler::new();
+  let bytecode = compiler.compile(ast).expect("compile");
+  let mut vm = VM::new(&bytecode);
+  vm.set_global("nums", Value::NumberList(vec![dec!(30), dec!(10), dec!(20)]));
+  vm.execute().expect("execute");
+  assert_eq!(vm.get_global("result").unwrap(), &Value::Number(dec!(10)));
+}
+
+#[test]
+fn test_numberlist_isempty() {
+  let ast = parser::program("result = nums.isEmpty()").expect("parse");
+  let mut compiler = Compiler::new();
+  let bytecode = compiler.compile(ast).expect("compile");
+  let mut vm = VM::new(&bytecode);
+  vm.set_global("nums", Value::NumberList(vec![]));
+  vm.execute().expect("execute");
+  assert_eq!(vm.get_global("result").unwrap(), &Value::Boolean(true));
+}
+
+// ==================== EXTERNAL METHOD TESTS ====================
+
+#[test]
+fn test_external_method_on_number() {
+  let ast = parser::program("result = x.format(2)").expect("parse");
+  let mut compiler = Compiler::new();
+  let bytecode = compiler.compile(ast).expect("compile");
+  let mut vm = VM::new(&bytecode);
+  vm.set_global("x", Value::Number(dec!(3.14159)));
+  vm.register_method("Number", "format", |this, args| {
+    match (this, &args[0]) {
+      (Value::Number(n), Value::Number(decimals)) => {
+        let d = decimals.to_u32().unwrap_or(2);
+        let formatted = format!("{:.1$}", n, d as usize);
+        Ok(Value::String(formatted.into()))
+      }
+      _ => Err("format requires a number".to_string()),
+    }
+  });
+  vm.execute().expect("execute");
+  assert_eq!(vm.get_global("result").unwrap(), &Value::String("3.14".into()));
+}
+
+#[test]
+fn test_external_method_on_string() {
+  let ast = parser::program(r#"result = "hello".repeat(3)"#).expect("parse");
+  let mut compiler = Compiler::new();
+  let bytecode = compiler.compile(ast).expect("compile");
+  let mut vm = VM::new(&bytecode);
+  vm.register_method("String", "repeat", |this, args| {
+    match (this, &args[0]) {
+      (Value::String(s), Value::Number(n)) => {
+        let count = n.to_usize().unwrap_or(0);
+        Ok(Value::String(s.repeat(count).into()))
+      }
+      _ => Err("repeat requires a number".to_string()),
+    }
+  });
+  vm.execute().expect("execute");
+  assert_eq!(vm.get_global("result").unwrap(), &Value::String("hellohellohello".into()));
+}
+
+// ==================== RAND FUNCTION TESTS ====================
+
+#[test]
+fn test_rand_returns_number_in_range() {
+  let result = run_expr("rand(1, 10)");
+  match result {
+    Value::Number(n) => {
+      assert!(n >= dec!(1) && n <= dec!(10), "rand result {} not in range 1..10", n);
+    }
+    _ => panic!("Expected Number, got {:?}", result),
+  }
+}
+
+#[test]
+fn test_rand_same_min_max() {
+  let result = run_expr("rand(5, 5)");
+  assert_eq!(result, Value::Number(dec!(5)));
+}
+
+#[test]
+fn test_rand_in_assignment() {
+  let result = run_and_get_result("result = rand(1, 100)");
+  match result {
+    Value::Number(n) => {
+      assert!(n >= dec!(1) && n <= dec!(100));
+    }
+    _ => panic!("Expected Number"),
+  }
+}
+
+// ==================== BYTECODE CACHE & RE-EXECUTE TESTS ====================
+
+#[test]
+fn test_bytecode_reuse_with_different_globals() {
+  // Compile once, execute multiple times with different inputs
+  let ast = parser::program("base * rate").expect("parse");
+  let mut compiler = Compiler::new();
+  let bytecode = compiler.compile(ast).expect("compile");
+
+  // First execution
+  let mut vm = VM::new(&bytecode);
+  vm.set_global("base", Value::Number(dec!(100)));
+  vm.set_global("rate", Value::Number(dec!(1.5)));
+  let result1 = vm.execute().expect("execute");
+  assert_eq!(result1, Value::Number(dec!(150.0)));
+
+  // Second execution with different values — reuse same bytecode
+  let mut vm2 = VM::new(&bytecode);
+  vm2.set_global("base", Value::Number(dec!(200)));
+  vm2.set_global("rate", Value::Number(dec!(2.0)));
+  let result2 = vm2.execute().expect("execute");
+  assert_eq!(result2, Value::Number(dec!(400.0)));
+}
+
+/*
+#[test]
+fn expr_test() {
+  let cases = vec![
+      ("(18.49730)/81.6*63.0852-64.773/(32.2007)+41.2879-85.4-(13.50-56.0243)-(49.35612)+(59.8+63.30426)/(70.56281)-13.81690*(86.7057*(43.8*(86.41762)+72.6*58.35/28.62060))", "-4711911.631973682999201581558386"),
+("(52.01054+91.492+69.997)*(60.42597)+20.1237/43.9-(47.94052)+82.54171*48.5715+61.48", "16924.0893449520574032"),
+("(21.10121)+(21.4)+48.18/(11.31875)+(71.4+21.05*(41.412)-(64.6949)/44.1296/(24.184/90.3442*49.8813)+(46.02969)*(22.6)/(77.3720/(88.8365/55.5577)))", "1011.2692544086353375"),
+("(11.204)*5.3+17.95658-40.86/0.93-91.2*58.71*(61.36106/81.8-(45.24309)*(14.735/76.41129))", "42731.423060682431273967518192"),
+("(71.0626*45.04296)*(1.38)+(24.6055)-(95.7317)-(17.14)/(92.799)/(6.00*42.7395/81.6413)/(18.65)-39.71747-33.2061", "4273.1474690724873717"),
+("(40.294)*(42.0572)+(6.6897-53.21*11.12257)/(38.5)-(81.02849)+(58.49)-10.5+81.53/(50.3951*(18.03091)/(30.81381)+(13.80113)*(88.8/(76.5940)*38.12896)-(66.044)+(56.9/64.7))", "1646.5577647573549686"),
+("42.4322*76.024*57.70-79.228-(83.6/11.815)+(0.66)+(19.205+91.8077/39.740*(62.10317+60.054+41.0))", "186442.931938706969977122025"),
+("76.98*(89.73+83.00)+11.56316-96.7821/(91.785-72.1*(51.6704*92.552/(32.9239-78.748)-(47.1707/84.408)))", "13308.3059193646290232"),
+("41.25*(56.81*88.01)+68.0-(46.9003)-81.8620+71.9*14.100+(11.327/93.36124)", "207196.883149438278669"),
+("(99.221)+93.1*67.70+(39.31+(2.72/21.097)-59.2016)*(53.94/23.348)+17.50364+24.95+90.45581", "6489.3434981248784293961014069820784"),
+("(2.497*81.61)*60.72-(76.023)-(56.0)/(87.8+(55.44/(90.26)+(2.6925*70.1204)+(9.143)/79.8150)/(5.71574/85.39960+27.05540))", "12296.918129654197124"),
+("67.2+46.9-78.01624*53.31480*(12.1)/85.4145*91.2-(63.6-45.6835*16.951)", "-52913.1074455104904888"),
+("(97.4)-67.2+(54.019)*77.36*66.24/87.43608+(28.8)*47.9*75.8-(73.5)*78.007-66.2325/74.33*9.161", "102022.0053553527787263794"),
+("57.42*(64.462)/63.02-(77.6516-(66.8*98.435+97.92*53.260*(51.96*(77.7742/(76.35+(7.7+(80.6245/77.98*6.5463)))))))", "238618.4626891788131077667264"),
+("(73.01*14.485)/(0.4198)-(53.85/(86.5172)/(39.49)/72.4)*(28.2281)+(8.5936)+34.02-80.78209/(97.361)+(21.3635)-(26.825+66.087)", "2489.40467830588322294532"),
+("(5.9+(45.805)/85.657)/(78.531*56.026+74.0075+15.9)+(50.9)*(39.8273-27.96138+47.631+(46.74843+84.12))", "9689.597748229417814"),
+("7.162*66.353+66.9/43.84+97.3495-63.300*82.06213+(92.31)-11.878+98.7", "-4441.3051393503649635"),
+("0.79/(77.43065-22.339-(78.8)-24.806+(85.917)+(22.0833*71.988)+69.30312+(82.91418/41.630))", "0.0004651354312546"),
+("(99.0+55.06-86.646)-(54.454+33.35-(77.3)/(64.5733*(32.994*31.18645+96.5636-11.1298)-(92.3)/(13.94399/(68.3964)+67.65089)-(34.450/31.15957)))", "-20.3889257620919107"),
+("3.5+79.5/(45.3103/(12.77)/12.34)/11.0+(75.0587+58.24958-45.2774)/(75.4)/(71.934*(23.72+19.81273))", "28.6356432996469259"),
+("95.53+37.63780+(83.018+(72.230)*73.808)-(22.3)-35.5*43.7506*1.5+(75.1)+32.08/(78.287)+(19.9957)-47.08*72.5", "-122.4763357079719494"),
+("77.7+(83.56)*(37.4)+12.0871+(87.23119*(31.86)/(36.6)/17.99570+54.3*76.9504-(62.6508*44.32)+(11.7022-40.7))", "4591.8761295565077158"),
+("11.952*(92.7476+41.021/(98.62656)*76.29)/(99.1+29.589+2.559)-73.3466-91.59624", "-153.6073154918920115"),
+("64.461-22.88+(22.9)+91.54*13.56/28.9252-12.1494/(66.725-85.332+8.0089)-65.4172-21.76", "21.3637039814725284"),
+("92.787+(14.5723-(40.68935-3.8035/(12.61)*15.0999-28.4705)+64.3935)-6.8149+51.5883-35.3+(53.8352*89.633)", "4998.97234941522601063649"),
+("83.839+(22.7557+(9.89*30.11)*(78.1989-20.077)*(96.440*7.22746)/52.9-(11.19*13.53987)*(41.137*37.409/33.22))", "221140.04372737897527175584969"),
+("97.87/55.7470+93.266*(87.427)-63.19-(18.5+54.59274)*86.8917/(82.72*(89.825*16.328))", "8092.4798427571432436"),
+("69.56577+10.19659*(53.9190/91.3*5.35)*(18.47)+2.30898*30.3*67.05780*(73.206)+77.82/(43.5503)-63.37332-(56.65939*54.6798)", "340951.1456145128387014845945685"),
+("(20.0128)*4.11078/41.20165+(54.056)*54.17877+(40.54090)/33.53-(90.50882/(15.8201+(18.06068+50.3214)+(5.79341)*(27.1)/46.161)+(79.9/(3.727/59.92870)))", "1646.0995394189492598"),
+("(43.80835)-10.839+(62.86974*18.671)*(92.474-(16.4505)/36.2*(35.1949-39.7541-98.9))", "163771.2724064544227594178868709248"),
+("(60.4461)-37.71-(68.25714)/85.52189/56.16*65.06/(22.82-87.557)/(85.78)*(67.09395+(57.08)/98.169)/(23.48216-28.4621)+99.059-(85.884-57.1)", "93.0088373059094804"),
+("(64.50745+34.278-31.140+(52.25116*87.741-94.3)-(93.000+(76.525)*68.8693)-21.82036-(74.2)-(21.5767+(29.58)-(67.8*26.02123)))", "811.75363106"),
+("(22.558)/20.5*5.07-(81.397/81.9-50.27800)/(59.7534)-(1.214+(27.22)-19.94-(5.1)-5.74*(25.540)+(71.8-(42.79143)*31.356)-(75.8-71.2/57.72385))", "1494.14399091315859183"),
+("(26.204+79.321)+(75.1655/17.009)/(68.4388+(92.299)-(91.37210)-(87.16871)+(18.89-3.914-12.98*(79.7636)+(28.92*85.5084-80.2871+27.092)+17.6564)+92.77317)-(95.97760*55.46)", "-5217.3897340542493272"),
+("70.6901-(6.45-(10.7)*30.46112)+(82.64)/95.2541/(10.82)*(91.2162+47.9/82.4498)/7.1-(74.5198/86.87529)", "390.3529982272845288"),
+("59.5189+70.409*62.585/(5.8410)+58.58*(38.9)+8.656*52.21-(69.29)*(80.58/11.87302)", "3074.368775273583646156"),
+("55.351*(18.681-93.1)/77.04+(41.00399)+(29.5)/(31.07/(16.214-72.0-84.15313)/(98.888)+(13.93107-18.312/7.0036-14.77648))", "-20.984219520618196"),
+("(66.9*39.9*61.29392)*75.85*(72.9214)-60.84/98.3528/(75.803-82.1356/48.1234)+(47.9*85.9084)/2.72-54.161+69.29430/(17.76/34.5989-36.563)", "904956477.2197517050761512"),
+("(35.9+(13.05613)+20.00271-43.24/3.11)-76.3+53.85505*(19.25-(40.5604)-73.8-17.0298)", "-6060.5607749874919614"),
+("(13.2+(67.5)+(81.77331-62.35)-37.9411)/(11.32/(87.70619*(69.077-(46.7)-(73.529*25.55316))))", "-894437.3132401834266139"),
+("(46.1832/82.96469+97.2240-54.50*59.62)/84.11388-(20.3168*10.35291)-23.103+38.36584+(60.8)/(70.7*94.19)*(29.7735*(54.65937+(34.83763*11.485)))", "-108.91894850517456148018720811"),
+("(21.00-(95.26747-28.84873-(41.7700)+82.19*95.57*(82.4241)*74.872)+(62.61/43.59))", "-48474600.0209386043871163"),
+("(78.9)+(90.9746)+(88.622/(7.12-50.3430-(53.9/8.5136*63.44757+(9.46305-36.34)+(64.0+71.0940))))", "169.7143807630540127"),
+("5.2*(96.47)-(84.84860-(70.951/(17.196*16.01543*29.327/9.8-(94.659)-(18.7*70.0))))", "416.6729665063680072"),
+("91.6*(46.85)*(93.8273)+(34.3124)+73.482-(91.3897-(63.7819-(77.598)-(79.8)/(79.9703-38.8657)/(26.8+71.84517)*(5.22498/2.4943)))", "402658.65223186841219833803621004565091"),
+("32.083/(3.3866)*34.553/(86.60+17.11649*(33.1554)*17.6+94.690)+63.418+(2.07)-(12.54225)/45.99069+(8.67)/(78.0303)*99.13520/81.036+8.464", "73.8474028679700169"),
+("8.368+(12.708/57.36-69.67948-71.058)+(81.554*(65.53478)/32.251*24.576-58.81309)+34.275*20.9", "4598.111846663777242932"),
+("(26.96991)/(15.313)-77.8-(54.211)/(63.9206/79.2+(35.398)+(37.0871)/6.925)+63.158+26.41", "12.2248588019904453"),
+("(52.5)+(29.86)*(0.57)/(20.46534)-(27.85*(6.04183)/92.619/27.366)/77.0657*(12.397*39.057)", "52.9145631756737791057185"),
+("(59.0/49.4)+(29.4310*(87.861)/56.9821)+(8.6)+(12.4982+97.82)/92.128*53.9236-37.1-20.652", "61.99268345398978546564"),
+("(10.472)*7.5-(8.0348+76.886)+98.0794/(24.6+(90.903)+(13.593)*(3.1*(4.2+47.8421-40.94/42.377)*(82.1)/86.9)-(28.3393)*(66.38358*7.3453))", "-6.3892047123880735"),
+("98.9/(14.49550)-22.174*(60.06002)/(28.67844)-87.3-(78.01201)*27.2/(65.24712*(38.744)/(52.4)-(0.84403)+(12.11000+1.7/75.90))", "-162.5590728690040862"),
+("66.16/36.930*20.791*(50.127)*61.6-(85.5-82.02442)/(90.42+(3.3)/63.3)*62.97490*(85.1)+(40.1040+14.00162-(67.4883)+29.9688*(81.46/85.95))", "114821.36456608956795954937976"),
+("85.3797+66.025+(22.2)*8.38/48.855-(4.8)-10.4595-(69.49066/79.25165-9.1)", "148.1762859019992207"),
+("61.4374/22.8892/(48.8)-94.057*99.2987+(51.89039*39.5)+40.2567/71.06/(38.003+23.001-(82.22883)*7.028-(47.84255+(89.6098+1.66113-(48.98*41.63619)+68.535+11.491)))", "-7290.0119837261121902"),
+("(65.66845)+48.2-(62.44*(8.3)*86.1969/64.1838/37.301)-(75.0316)*12.36*(3.86712/(41.50180/24.341-81.6)*63.2991*47.40702-(47.72*26.00311/(41.4)/95.819/31.0174))", "134805.6197977978758035622071345613888"),
+("(88.719)-42.0846-(65.73638)-46.861*(79.4657)+97.45-(36.00793/99.07578-(36.2)/90.5)+57.8895/19.65274/99.176+75.85+22.95/70.9496+93.89555/(64.12-43.53)", "-3564.6941658600054532"),
+("19.64337/56.96718-2.6+(59.55)*(66.910/45.478+(35.73+(82.6-(21.1305)-25.63702)+(12.2691/(1.70)+0.83995/(66.8476+(97.047/(17.54544)-26.945-(2.10-(61.3/92.3)))))))", "4777.820291065982541655"),
+("(25.9338-(73.42-32.454*(54.0)-56.2936)/(25.28590/(88.28)+(65.46504)*69.73926*(84.336)/74.6121)-77.8075-(18.398)*8.96)/49.15*58.7420", "-258.6124192419976067014"),
+("58.68444+(27.9771+38.9)+(6.0043)/(1.54893+(53.8248*(73.4-(0.76750)+26.29519+78.9)))", "125.5621672061336517"),
+("6.26480/78.969/(32.05585)*(50.025)*89.4*26.7+(53.38076)-96.711+(25.3)*(7.47849-16.51)+29.1+(90.20164)/(60.1092/46.1)", "121.96632115022759394645"),
+("(11.7)*(14.301)/(84.39*53.66)*93.8/(8.537)+(56.90072)*(8.803)*(49.63/20.1624)*67.9433*(69.967+97.229-(73.025-31.0))", "10485783.52967474232404148937388096712"),
+("56.691-43.952-(32.10)-56.45673+(97.0-80.41)*91.2*(83.5671-11.51855/(15.53601)-28.08144)/19.70302-(42.2-65.3055)", "4151.1351250306809158"),
+("(91.45417+(48.3132)/72.7769)+(51.50708)+(25.9703/(31.3)*(1.04)*(66.79)/47.8)*49.210/(84.367)/70.2-62.5*(16.29046)+(96.3-14.1879)", "-792.4065282171246921"),
+("12.6443*(29.6)-(53.77038+(33.2-78.371*(74.10073/(2.29880/10.74854+(72.17-39.238+60.7811+50.107)/82.539)*(64.6157+29.1-(94.9886)*(89.712-37.216*93.9971)))))", "961382698.243192206397847895388770867776"),
+("(38.4*(13.0848*55.053)-26.7/20.0669)-38.5*(65.6)*52.8340*21.6*3.04/46.6+(46.362+(71.05913)-28.55226)*(46.79905*(97.560+5.39-89.20))", "-103180.3262296021176548"),
+("(33.5486+(98.3337-(11.063*(33.44014)*82.01)/(28.963/54.3977)*78.10826)/(50.8215+73.219))", "-35847.7923091900694923"),
+("(74.99783)-(87.78+26.00356)+12.7+86.6+32.3+10.2969/46.8457-53.53427+(15.83-66.1848)", "-10.854995407476033"),
+("(37.94885)-91.45941-(3.77*(82.82297-(83.076)/(37.47916*(58.91323)*67.541)*(12.2470*95.077)+90.147)-4.55-98.5)-(39.8397)*92.85+9.6273", "-4289.600780422766101115547362"),
+("(27.7418*1.4960*55.51)/85.2012*68.42-(70.576/46.0*(74.068+63.04361)*(43.83113+(29.674*(38.8*86.98/(52.048-62.07-62.5)+20.79847)-(87.47*78.14))))", "1591112.334306702048791493272153652435667521408"),
+("44.80585/18.6414/(42.769+(24.93)*30.321)*42.76-(90.1)/(71.16021)*10.7/(16.52649/89.184*42.730/99.88522*16.760)-94.0+45.6665-(62.374)*57.6+2.0+80.320", "-3568.824205650661715544"),
+("(5.65-(91.81)+59.05*(31.927)-20.262)-(46.51542/(9.34940)/(71.2808)*(67.6013/(6.12)*11.913)-58.1*73.6247)+11.08*46.9/93.9978-41.720", "6011.08605300744308160020074732161430413"),
+("(52.8*54.8099)*(42.2411/(32.56018-(58.43)*(3.5/39.339)*45.3794)+60.9)/(81.16609*85.3508)+17.716+86.23388/(51.1/50.50)", "128.2912092972705256"),
+("(97.07*(31.1146+(31.29)*20.8833)/(93.49*15.31)*(79.9)/(4.61235)/(77.5129)/31.211)-(44.89769/(54.28109*12.1595)/(45.824)+20.94)+99.702/28.273+(96.592/52.19820)", "-15.232170162991231"),
+("87.421/(78.11-(27.61153)-(78.1445-66.70131)/(55.5)/70.70)*32.625/33.09/(91.45273)*(42.3197)/(31.78+15.55452*15.573-(72.7587+63.652))", "0.0057404291598226"),
+("(11.6757)+33.49685+(43.559)+72.80540-(26.3014*(11.17+52.0146)-(7.6)/33.3+2.42/94.7)", "-1500.1038145940315395"),
+("60.273/(79.5631)-72.866-68.0664+80.659/77.57857/83.94+76.572/7.82247/51.15993-64.3118", "-204.2829282587953641"),
+("23.6817/58.92240/(71.3797)+15.6402*30.8*8.185*5.935/23.767-(30.2134-6.5001/(26.5807-(69.3195)+(77.00+63.2)))", "954.4549081069203237"),
+("(52.133-(46.31994*(47.631+4.676-6.5729)+(0.07)-(82.7+31.96*(51.414)+96.22890)/(91.4)+86.208)/41.0)-(4.0134+59.8961)", "-65.0629169960494209"),
+("(3.76*98.61105)-(20.0617*(35.4185)+(4.8907+(18.555)-(25.17472)*(0.6227/36.8742)/(17.7785)*85.7/86.034)*88.9489)-(95.34045/80.87824)+65.472-77.7", "-2436.53507563541415315542"),
+("27.011/53.45/(53.37)*1.1/(53.129+47.48254+(95.47028/64.1+86.0/81.19140))", "0.0001009662956334"),
+("(20.44*33.1592)*80.1*(79.07)-(66.860)*8.896+27.24+6.043/47.15182*3.59+(15.3140*(25.5731)-(81.7570)+98.206/(7.2/(86.3)+4.782)+(59.04*(62.2660/98.68)))", "4292486.89845426863322881"),
+("(74.3846/65.70273)+(78.58930*21.336)-67.2+(36.9657-(27.875*(13.09705)-26.4*8.047-(81.3)*(41.5-(70.3212-86.39)+(95.9-37.34099+13.70-94.196-19.01))))", "2846.3928276993377064"),
+("(68.8553+20.60933/(17.10*21.562)-(80.980)+(55.81242-(52.3)-48.02297+(33.21/(36.68/26.78797+(10.8651)+92.46576*67.23))))", "-56.574022494248659"),
+("(64.989)*32.9-(96.9)+60.4014-17.06603*(8.58+(18.48-(41.29564-29.391+44.0)))", "2593.9029915792"),
+("8.96739+(83.4686/95.57831+12.158/68.1757/73.11929/(29.81572*69.0)+21.9)*(38.35)-(48.00/(46.683)-94.18665)/(54.2)+(68.03-(75.3649)/61.4930)-(99.592*55.135)", "-4540.15819935667646422"),
+("(41.0+(82.2*14.0709)*(17.9189/(20.32)+90.08974-85.75252-(39.429)+25.4250)+50.8)/(84.2806-(50.55516+52.477)-(63.8)+40.7+54.4-67.324)", "183.824911350546589"),
+("(8.2)+(61.31027)*(80.70)-46.72-62.4+(71.96-9.1/(51.82540)/(51.79740-(59.9*44.4)))", "4918.7788563334205222"),
+("77.54*86.508+(95.63110)+93.443+22.16*96.48-(98.6136-1.76491)/(20.7910*13.23335)", "9034.5492152100066785"),
+("77.35187/8.37-(49.84344+69.52151+(44.2723*87.0381-(40.50+(15.4)*49.0701*(72.0)*74.5430+50.5)/(81.005)*(86.53352*38.6/(57.03-80.610-35.8*31.834+71.6214))))", "-157169.86473751443870274723124909867384"),
+("(23.7)-(77.288)/(91.9*8.904+(43.789/(46.0)+0.8*1.93290-(44.788)+(42.74)+45.2399)*(29.4)*(92.75+(38.02)+39.247+20.4827))", "23.699698934293117"),
+("(6.3636*(20.7031+20.9)*56.61+(53.7145)/64.6063/53.5024-(23.0)-(43.8*39.67586/26.0938-81.45407*42.8631))", "18389.0332176857809571"),
+("4.155*22.7+(75.01-22.98284+(82.62)-98.4994)-(48.3277)*96.253-(63.5951-10.199)", "-4574.6159481"),
+("(22.35584)*5.744*(70.04/(80.9943)/(38.5-99.4)/69.4)/50.67159*(90.2400)-(63.7/75.7)*79.11-99.07+(73.20756*(88.95470/(44.115*(50.33195)+(80.85280-(49.22+88.592)))))", "-162.676134673564991559628"),
+("55.320+(90.0*(7.32)+(49.149/(43.4-(1.4864)/(93.0026/(2.0/(31.62905+70.07+45.5)/65.67+32.289)/(22.65365/64.7)))))", "715.2571999910689178"),
+("(50.37)*31.78158*59.84/13.19537/(72.38*(39.3889-(15.91*(14.288/(77.9524)*40.0427)+(45.3365/68.15663))))", "-1.2851101855344694"),
+("67.34548/5.643+99.2370-(47.2-(90.0837/99.444)-(10.95663-75.4-69.73)*45.6/(42.9618)*(82.207*29.1))", "-340618.14427072036819048594"),
+("(10.2910)*30.915-54.115/70.8586+(17.89031)/(80.11/27.0835-(63.24020)-35.05283)+(81.6275)+25.671-(82.7379/97.04-50.90291-39.40)+(27.87)/(63.40)/51.81*86.602", "514.6784854381998292716"),
+("(53.447)-(88.1549)*(20.505)+(69.8)-(61.1982)+(88.510+(48.7213/(82.0957-(93.5-63.34-68.899))))", "-1656.6542183017804488"),
+    ];
+
+  for (expr, expected) in cases {
+    let mut val1 = VM::execute(expr).unwrap();
+    val1.rescale(6);
+
+    let mut val2 = Decimal::from_str(expected).unwrap();
+    val2.rescale(6);
+
+    assert_eq!(val1, val2, "L: {} | R: {}", expr, expected);
+  }
+}
+*/
+
+// ==================== ERROR LOCATION TESTS ====================
+
+#[test]
+fn test_error_location_division_by_zero() {
+  let code = r#"x = 10
+y = 0
+result = x / y"#;
+
+  let mut compiler = Compiler::new();
+  let (bytecode, debug_info) = compiler
+    .compile_from_source(code)
+    .expect("Failed to compile");
+
+  let mut vm = VM::new(&bytecode);
+  vm.set_debug_info(&debug_info);
+
+  let err = vm.execute().unwrap_err();
+  let err_msg = err.to_string();
+
+  // Error should include line 3 (where the division happens)
+  assert!(
+    err_msg.contains("line 3"),
+    "Error should contain line 3, got: {}",
+    err_msg
+  );
+  assert!(
+    err_msg.contains("Division by zero"),
+    "Error should mention division by zero, got: {}",
+    err_msg
+  );
+}
+
+#[test]
+fn test_error_location_modulo_by_zero() {
+  let code = r#"x = 15
+y = 0
+result = x % y"#;
+
+  let mut compiler = Compiler::new();
+  let (bytecode, debug_info) = compiler
+    .compile_from_source(code)
+    .expect("Failed to compile");
+
+  let mut vm = VM::new(&bytecode);
+  vm.set_debug_info(&debug_info);
+
+  let err = vm.execute().unwrap_err();
+  let err_msg = err.to_string();
+
+  assert!(
+    err_msg.contains("line 3"),
+    "Error should contain line 3, got: {}",
+    err_msg
+  );
+}
+
+#[test]
+fn test_error_location_type_mismatch() {
+  let code = r#"x = "hello"
+y = 5
+result = x + y"#;
+
+  let mut compiler = Compiler::new();
+  let (bytecode, debug_info) = compiler
+    .compile_from_source(code)
+    .expect("Failed to compile");
+
+  let mut vm = VM::new(&bytecode);
+  vm.set_debug_info(&debug_info);
+
+  let err = vm.execute().unwrap_err();
+  let err_msg = err.to_string();
+
+  assert!(
+    err_msg.contains("line 3"),
+    "Error should contain line 3, got: {}",
+    err_msg
+  );
+}
+
+#[test]
+fn test_error_location_method_not_found() {
+  let code = r#"x = 42
+result = x.unknownMethod()"#;
+
+  let mut compiler = Compiler::new();
+  let (bytecode, debug_info) = compiler
+    .compile_from_source(code)
+    .expect("Failed to compile");
+
+  let mut vm = VM::new(&bytecode);
+  vm.set_debug_info(&debug_info);
+
+  let err = vm.execute().unwrap_err();
+  let err_msg = err.to_string();
+
+  assert!(
+    err_msg.contains("line 2"),
+    "Error should contain line 2, got: {}",
+    err_msg
+  );
+  assert!(
+    err_msg.contains("unknownMethod"),
+    "Error should mention method name, got: {}",
+    err_msg
+  );
+}
+
+#[test]
+fn test_no_error_location_without_debug_info() {
+  // When debug info is not provided, errors should not include line numbers
+  let code = "result = 1 / 0";
+
+  let ast = parser::program(code).expect("Failed to parse");
+  let mut compiler = Compiler::new();
+  let bytecode = compiler.compile(ast).expect("Failed to compile");
+
+  // Create VM without setting debug info
+  let mut vm = VM::new(&bytecode);
+
+  let err = vm.execute().unwrap_err();
+  let err_msg = err.to_string();
+
+  // Should just be the plain error message
+  assert_eq!(err_msg, "Division by zero");
+}
+
+// ==================== OBJECT TYPE TESTS ====================
+
+fn make_object(entries: Vec<(&str, Value)>) -> Value {
+  let mut map = IndexMap::new();
+  for (k, v) in entries {
+    map.insert(SmolStr::new(k), v);
+  }
+  Value::Object(map)
+}
+
+#[test]
+fn test_object_property_access() {
+  let obj = make_object(vec![
+    ("name", Value::String("Alice".into())),
+    ("age", Value::Number(dec!(30))),
+  ]);
+  let result = run_expr_with_globals("customer.name", vec![("customer", obj)]);
+  assert_eq!(result, Value::String("Alice".into()));
+}
+
+#[test]
+fn test_object_property_access_number() {
+  let obj = make_object(vec![
+    ("age", Value::Number(dec!(30))),
+  ]);
+  let result = run_expr_with_globals("person.age", vec![("person", obj)]);
+  assert_eq!(result, Value::Number(dec!(30)));
+}
+
+#[test]
+fn test_object_property_access_missing() {
+  let obj = make_object(vec![
+    ("name", Value::String("Alice".into())),
+  ]);
+  let result = run_expr_with_globals("person.missing", vec![("person", obj)]);
+  assert_eq!(result, Value::Null);
+}
+
+#[test]
+fn test_object_nested_property_access() {
+  let address = make_object(vec![
+    ("city", Value::String("Istanbul".into())),
+    ("zip", Value::String("34000".into())),
+  ]);
+  let person = make_object(vec![
+    ("name", Value::String("Duhan".into())),
+    ("address", address),
+  ]);
+  let result = run_expr_with_globals("person.address.city", vec![("person", person)]);
+  assert_eq!(result, Value::String("Istanbul".into()));
+}
+
+#[test]
+fn test_object_property_assignment() {
+  let obj = make_object(vec![
+    ("name", Value::String("Alice".into())),
+    ("age", Value::Number(dec!(30))),
+  ]);
+  let code = r#"
+    person.name = "Bob"
+    person.name
+  "#;
+  let result = run_expr_with_globals(code, vec![("person", obj)]);
+  assert_eq!(result, Value::String("Bob".into()));
+}
+
+#[test]
+fn test_object_nested_property_assignment() {
+  let address = make_object(vec![
+    ("city", Value::String("Istanbul".into())),
+  ]);
+  let person = make_object(vec![
+    ("name", Value::String("Duhan".into())),
+    ("address", address),
+  ]);
+  let code = r#"
+    person.address.city = "Ankara"
+    person.address.city
+  "#;
+  let result = run_expr_with_globals(code, vec![("person", person)]);
+  assert_eq!(result, Value::String("Ankara".into()));
+}
+
+#[test]
+fn test_object_method_keys() {
+  let obj = make_object(vec![
+    ("name", Value::String("Alice".into())),
+    ("age", Value::Number(dec!(30))),
+  ]);
+  let result = run_expr_with_globals("person.keys()", vec![("person", obj)]);
+  assert_eq!(
+    result,
+    Value::StringList(vec![SmolStr::new("name"), SmolStr::new("age")])
+  );
+}
+
+#[test]
+fn test_object_method_length() {
+  let obj = make_object(vec![
+    ("a", Value::Number(dec!(1))),
+    ("b", Value::Number(dec!(2))),
+    ("c", Value::Number(dec!(3))),
+  ]);
+  let result = run_expr_with_globals("obj.length()", vec![("obj", obj)]);
+  assert_eq!(result, Value::Number(dec!(3)));
+}
+
+#[test]
+fn test_object_method_contains() {
+  let obj = make_object(vec![
+    ("name", Value::String("Alice".into())),
+  ]);
+  let code = r#"obj.contains("name")"#;
+  let result = run_expr_with_globals(code, vec![("obj", obj)]);
+  assert_eq!(result, Value::Boolean(true));
+}
+
+#[test]
+fn test_object_method_contains_missing() {
+  let obj = make_object(vec![
+    ("name", Value::String("Alice".into())),
+  ]);
+  let code = r#"obj.contains("missing")"#;
+  let result = run_expr_with_globals(code, vec![("obj", obj)]);
+  assert_eq!(result, Value::Boolean(false));
+}
+
+#[test]
+fn test_object_method_get() {
+  let obj = make_object(vec![
+    ("name", Value::String("Alice".into())),
+  ]);
+  let code = r#"obj.get("name")"#;
+  let result = run_expr_with_globals(code, vec![("obj", obj)]);
+  assert_eq!(result, Value::String("Alice".into()));
+}
+
+#[test]
+fn test_object_method_get_missing() {
+  let obj = make_object(vec![
+    ("name", Value::String("Alice".into())),
+  ]);
+  let code = r#"obj.get("missing")"#;
+  let result = run_expr_with_globals(code, vec![("obj", obj)]);
+  assert_eq!(result, Value::Null);
+}
+
+#[test]
+fn test_object_method_values_strings() {
+  let obj = make_object(vec![
+    ("a", Value::String("x".into())),
+    ("b", Value::String("y".into())),
+  ]);
+  let result = run_expr_with_globals("obj.values()", vec![("obj", obj)]);
+  assert_eq!(
+    result,
+    Value::StringList(vec![SmolStr::new("x"), SmolStr::new("y")])
+  );
+}
+
+#[test]
+fn test_object_method_values_numbers() {
+  let obj = make_object(vec![
+    ("a", Value::Number(dec!(1))),
+    ("b", Value::Number(dec!(2))),
+  ]);
+  let result = run_expr_with_globals("obj.values()", vec![("obj", obj)]);
+  assert_eq!(result, Value::NumberList(vec![dec!(1), dec!(2)]));
+}
+
+#[test]
+fn test_object_in_operator() {
+  let obj = make_object(vec![
+    ("name", Value::String("Alice".into())),
+    ("age", Value::Number(dec!(30))),
+  ]);
+  let code = r#""name" in person"#;
+  let result = run_expr_with_globals(code, vec![("person", obj)]);
+  assert_eq!(result, Value::Boolean(true));
+}
+
+#[test]
+fn test_object_in_operator_missing() {
+  let obj = make_object(vec![
+    ("name", Value::String("Alice".into())),
+  ]);
+  let code = r#""missing" in person"#;
+  let result = run_expr_with_globals(code, vec![("person", obj)]);
+  assert_eq!(result, Value::Boolean(false));
+}
+
+#[test]
+fn test_object_property_in_expression() {
+  let obj = make_object(vec![
+    ("price", Value::Number(dec!(100))),
+    ("quantity", Value::Number(dec!(5))),
+  ]);
+  let code = "order.price * order.quantity";
+  let result = run_expr_with_globals(code, vec![("order", obj)]);
+  assert_eq!(result, Value::Number(dec!(500)));
+}
+
+#[test]
+fn test_object_property_in_if() {
+  let obj = make_object(vec![
+    ("active", Value::Boolean(true)),
+    ("discount", Value::Number(dec!(10))),
+  ]);
+  let code = r#"
+    if customer.active then
+      result = customer.discount
+    else
+      result = 0
+    end
+  "#;
+  let ast = parser::program(code).unwrap();
+  let mut compiler = Compiler::new();
+  let bytecode = compiler.compile(ast).unwrap();
+  let mut vm = VM::new(&bytecode);
+  vm.set_global("customer", obj);
+  vm.execute().unwrap();
+  let val = vm.get_global("result").unwrap().clone();
+  assert_eq!(val, Value::Number(dec!(10)));
+}
+
+#[test]
+fn test_object_property_with_method_call() {
+  let obj = make_object(vec![
+    ("name", Value::String("hello world".into())),
+  ]);
+  let code = "obj.name.upper()";
+  let result = run_expr_with_globals(code, vec![("obj", obj)]);
+  assert_eq!(result, Value::String("HELLO WORLD".into()));
+}
+
+#[test]
+fn test_object_add_new_property() {
+  let obj = make_object(vec![
+    ("name", Value::String("Alice".into())),
+  ]);
+  let code = r#"
+    person.age = 25
+    person.age
+  "#;
+  let result = run_expr_with_globals(code, vec![("person", obj)]);
+  assert_eq!(result, Value::Number(dec!(25)));
+}
+
+// ==================== VALUE::FROM_JSON TESTS ====================
+
+#[test]
+fn test_from_json_object() {
+  let val = Value::from_json(r#"{"name": "Alice", "age": 30, "active": true}"#).unwrap();
+  let code = r#"
+    result = person.name
+  "#;
+  let result = run_expr_with_globals(code, vec![("person", val)]);
+  assert_eq!(result, Value::Null); // result is in global
+  // use the helper that reads globals
+  let val2 = Value::from_json(r#"{"name": "Alice", "age": 30, "active": true}"#).unwrap();
+  let r = run_and_get_result_with_globals("result = person.name", vec![("person", val2)]);
+  assert_eq!(r, Value::String("Alice".into()));
+}
+
+#[test]
+fn test_from_json_nested_object() {
+  let json = r#"{"address": {"city": "Istanbul", "zip": "34000"}}"#;
+  let val = Value::from_json(json).unwrap();
+  let result = run_expr_with_globals("person.address.city", vec![("person", val)]);
+  assert_eq!(result, Value::String("Istanbul".into()));
+}
+
+#[test]
+fn test_from_json_with_arrays() {
+  let json = r#"{"tags": ["vip", "tr"], "scores": [10, 20, 30]}"#;
+  let val = Value::from_json(json).unwrap();
+  if let Value::Object(map) = &val {
+    assert!(matches!(map.get("tags").unwrap(), Value::StringList(_)));
+    assert!(matches!(map.get("scores").unwrap(), Value::NumberList(_)));
+  } else {
+    panic!("Expected Object");
+  }
+}
+
+#[test]
+fn test_from_json_primitives() {
+  assert_eq!(Value::from_json("null").unwrap(), Value::Null);
+  assert_eq!(Value::from_json("true").unwrap(), Value::Boolean(true));
+  assert_eq!(Value::from_json("42").unwrap(), Value::Number(dec!(42)));
+  assert_eq!(Value::from_json(r#""hello""#).unwrap(), Value::String("hello".into()));
+}
+
+#[test]
+fn test_from_json_full_workflow() {
+  // Simulate: JSON from API → Value → VM execution
+  let customer_json = r#"{
+    "name": "Duhan",
+    "age": 30,
+    "active": true,
+    "tags": ["premium", "tr"]
+  }"#;
+  let customer = Value::from_json(customer_json).unwrap();
+
+  let code = r#"
+    if customer.active then
+      result = customer.tags.first()
+    else
+      result = "none"
+    end
+  "#;
+  let r = run_and_get_result_with_globals(code, vec![("customer", customer)]);
+  assert_eq!(r, Value::String("premium".into()));
+}
\ No newline at end of file
diff --git a/wasm/.gitignore b/wasm/.gitignore
new file mode 100644
index 0000000..54954ce
--- /dev/null
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+/target
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diff --git a/wasm/Cargo.lock b/wasm/Cargo.lock
new file mode 100644
index 0000000..5995659
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+ "prettyplease",
+ "syn 2.0.117",
+ "wasm-metadata",
+ "wit-bindgen-core",
+ "wit-component",
+]
+
+[[package]]
+name = "wit-bindgen-rust-macro"
+version = "0.51.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c0f9bfd77e6a48eccf51359e3ae77140a7f50b1e2ebfe62422d8afdaffab17a"
+dependencies = [
+ "anyhow",
+ "prettyplease",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.117",
+ "wit-bindgen-core",
+ "wit-bindgen-rust",
+]
+
+[[package]]
+name = "wit-component"
+version = "0.244.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9d66ea20e9553b30172b5e831994e35fbde2d165325bec84fc43dbf6f4eb9cb2"
+dependencies = [
+ "anyhow",
+ "bitflags",
+ "indexmap",
+ "log",
+ "serde",
+ "serde_derive",
+ "serde_json",
+ "wasm-encoder",
+ "wasm-metadata",
+ "wasmparser",
+ "wit-parser",
+]
+
+[[package]]
+name = "wit-parser"
+version = "0.244.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ecc8ac4bc1dc3381b7f59c34f00b67e18f910c2c0f50015669dde7def656a736"
+dependencies = [
+ "anyhow",
+ "id-arena",
+ "indexmap",
+ "log",
+ "semver",
+ "serde",
+ "serde_derive",
+ "serde_json",
+ "unicode-xid",
+ "wasmparser",
+]
+
+[[package]]
+name = "wyz"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "05f360fc0b24296329c78fda852a1e9ae82de9cf7b27dae4b7f62f118f77b9ed"
+dependencies = [
+ "tap",
+]
+
+[[package]]
+name = "zerocopy"
+version = "0.8.48"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eed437bf9d6692032087e337407a86f04cd8d6a16a37199ed57949d415bd68e9"
+dependencies = [
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.8.48"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70e3cd084b1788766f53af483dd21f93881ff30d7320490ec3ef7526d203bad4"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.117",
+]
+
+[[package]]
+name = "zmij"
+version = "1.0.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b8848ee67ecc8aedbaf3e4122217aff892639231befc6a1b58d29fff4c2cabaa"
diff --git a/wasm/Cargo.toml b/wasm/Cargo.toml
new file mode 100644
index 0000000..dab5892
--- /dev/null
+++ b/wasm/Cargo.toml
@@ -0,0 +1,23 @@
+[package]
+name = "dexpr-wasm"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib", "rlib"]
+
+[dependencies]
+dexpr = { path = ".." }
+wasm-bindgen = "0.2"
+js-sys = "0.3"
+serde_json = "1"
+rust_decimal = "1.41.0"
+smol_str = "0.3.6"
+indexmap = "2"
+# Required for rand/crypto to work in WASM (browser crypto.getRandomValues)
+getrandom_03 = { package = "getrandom", version = "0.3", features = ["wasm_js"] }
+getrandom_04 = { package = "getrandom", version = "0.4", features = ["wasm_js"] }
+
+[profile.release]
+opt-level = "s"
+lto = true
diff --git a/wasm/src/lib.rs b/wasm/src/lib.rs
new file mode 100644
index 0000000..a3b6f6c
--- /dev/null
+++ b/wasm/src/lib.rs
@@ -0,0 +1,192 @@
+use dexpr::ast::value::Value;
+use dexpr::compiler::Compiler;
+use dexpr::language_info::LanguageInfo;
+use dexpr::vm::VM;
+use indexmap::IndexMap;
+use smol_str::SmolStr;
+use wasm_bindgen::prelude::*;
+
+/// Convert a dexpr Value to a serde_json::Value for JS interop.
+fn value_to_json(val: &Value) -> serde_json::Value {
+    match val {
+        Value::Null => serde_json::Value::Null,
+        Value::Boolean(b) => serde_json::Value::Bool(*b),
+        Value::Number(n) => {
+            if n.scale() == 0 {
+                if let Ok(i) = n.to_string().parse::() {
+                    return serde_json::Value::Number(i.into());
+                }
+            }
+            if let Some(f) = serde_json::Number::from_f64(n.to_string().parse::().unwrap_or(0.0)) {
+                serde_json::Value::Number(f)
+            } else {
+                serde_json::Value::String(n.to_string())
+            }
+        }
+        Value::String(s) => serde_json::Value::String(s.to_string()),
+        Value::NumberList(list) => {
+            serde_json::Value::Array(list.iter().map(|n| value_to_json(&Value::Number(*n))).collect())
+        }
+        Value::StringList(list) => {
+            serde_json::Value::Array(list.iter().map(|s| serde_json::Value::String(s.to_string())).collect())
+        }
+        Value::Object(map) => {
+            let obj: serde_json::Map = map
+                .iter()
+                .map(|(k, v)| (k.to_string(), value_to_json(v)))
+                .collect();
+            serde_json::Value::Object(obj)
+        }
+    }
+}
+
+/// dexpr engine for browser use via WASM.
+///
+/// Holds global variables and language metadata.
+/// Compile + execute expressions in one call via `execute()`.
+#[wasm_bindgen]
+pub struct DexprEngine {
+    globals: IndexMap,
+    language_info: LanguageInfo,
+    external_fns: Vec<(String, js_sys::Function)>,
+}
+
+#[wasm_bindgen]
+impl DexprEngine {
+    /// Create a new engine instance.
+    #[wasm_bindgen(constructor)]
+    pub fn new() -> Self {
+        Self {
+            globals: IndexMap::new(),
+            language_info: LanguageInfo::builtin(),
+            external_fns: Vec::new(),
+        }
+    }
+
+    /// Set a global variable from a JSON value string.
+    ///
+    /// ```js
+    /// engine.setGlobal("customer", '{"name": "Alice", "age": 30}');
+    /// engine.setGlobal("price", "100");
+    /// engine.setGlobal("name", '"hello"');
+    /// ```
+    #[wasm_bindgen(js_name = setGlobal)]
+    pub fn set_global(&mut self, name: &str, json: &str) -> Result<(), JsError> {
+        let value = Value::from_json(json).map_err(|e| JsError::new(&e))?;
+        self.update_language_info(name, &value);
+        self.globals.insert(SmolStr::new(name), value);
+        Ok(())
+    }
+
+    /// Get a global variable as JSON string. Returns undefined if not found.
+    #[wasm_bindgen(js_name = getGlobal)]
+    pub fn get_global(&self, name: &str) -> Option {
+        self.globals
+            .get(name)
+            .map(|v| serde_json::to_string(&value_to_json(v)).unwrap_or_default())
+    }
+
+    /// Register an external function callable from dexpr code.
+    ///
+    /// The JS function receives arguments as a JSON array string
+    /// and must return a JSON value string.
+    ///
+    /// ```js
+    /// engine.registerFunction("getRate", (argsJson) => {
+    ///   const args = JSON.parse(argsJson);
+    ///   return JSON.stringify(34.5);
+    /// });
+    /// ```
+    #[wasm_bindgen(js_name = registerFunction)]
+    pub fn register_function(&mut self, name: &str, f: js_sys::Function) {
+        self.external_fns.push((name.to_string(), f));
+    }
+
+    /// Compile and execute dexpr source code. Returns the result as JSON string.
+    ///
+    /// ```js
+    /// const result = engine.execute('customer.name.upper()');
+    /// const parsed = JSON.parse(result);
+    /// // → "ALICE"
+    /// ```
+    pub fn execute(&mut self, source: &str) -> Result {
+        // Compile
+        let mut compiler = Compiler::new();
+        let (bytecode, debug_info) = compiler
+            .compile_from_source(source)
+            .map_err(|e| JsError::new(&e.to_string()))?;
+
+        // Create VM
+        let mut vm = VM::new(&bytecode);
+        vm.set_debug_info(&debug_info);
+
+        // Apply globals
+        for (name, value) in &self.globals {
+            vm.set_global(name, value.clone());
+        }
+
+        // Apply external functions
+        for (name, js_fn) in &self.external_fns {
+            let js_fn = js_fn.clone();
+            vm.register_function(name, move |args: &[Value]| {
+                let json_args: Vec = args.iter().map(value_to_json).collect();
+                let args_str = serde_json::to_string(&json_args).unwrap_or_default();
+
+                let this = JsValue::NULL;
+                let js_arg = JsValue::from_str(&args_str);
+                let result = js_fn
+                    .call1(&this, &js_arg)
+                    .map_err(|e| format!("JS function error: {:?}", e))?;
+
+                let result_str = result
+                    .as_string()
+                    .ok_or_else(|| "External function must return a JSON string".to_string())?;
+                Value::from_json(&result_str)
+            });
+        }
+
+        // Execute
+        let result = vm.execute().map_err(|e| JsError::new(&e.to_string()))?;
+
+        // Collect modified globals back
+        for (name, _) in self.globals.clone().iter() {
+            if let Some(val) = vm.get_global(name) {
+                self.globals.insert(name.clone(), val.clone());
+            }
+        }
+
+        // Return result as JSON
+        let json = serde_json::to_string(&value_to_json(&result))
+            .map_err(|e| JsError::new(&e.to_string()))?;
+        Ok(json)
+    }
+
+    /// Get language metadata JSON for the CodeMirror editor.
+    /// Includes built-in + registered functions/methods and variables with field types.
+    /// Variables are auto-populated from setGlobal calls.
+    ///
+    /// ```js
+    /// const metadata = JSON.parse(engine.languageInfo());
+    /// const extensions = [basicSetup, dexpr(metadata)];
+    /// ```
+    #[wasm_bindgen(js_name = languageInfo)]
+    pub fn language_info(&self) -> String {
+        self.language_info.to_json()
+    }
+
+    /// Add a host function to the language metadata (for editor autocomplete).
+    /// Call this alongside registerFunction so the editor knows about it.
+    #[wasm_bindgen(js_name = addFunctionInfo)]
+    pub fn add_function_info(&mut self, name: &str, signature: &str, doc: Option) {
+        let name: &'static str = Box::leak(name.to_string().into_boxed_str());
+        let signature: &'static str = Box::leak(signature.to_string().into_boxed_str());
+        let doc: Option<&'static str> = doc.map(|d| &*Box::leak(d.into_boxed_str()));
+        self.language_info.add_function(name, signature, doc);
+    }
+
+    /// Internal: update language info when a global is set.
+    fn update_language_info(&mut self, name: &str, value: &Value) {
+        self.language_info.variables.retain(|v| v.name != name);
+        self.language_info.add_value(name, value, None);
+    }
+}