# 🛠️ oak-erlang Developer Guide

Erlang support for the Oak language framework.

Welcome to the internal implementation of the Erlang parser. This module provides the core logic for tokenizing and parsing Erlang source code into a high-fidelity syntax tree.

## 📦 Core Components

- **Lexer**: Tokenizes Erlang source code, handling atoms, variables, and macros with full fidelity.
- **Parser**: Implements the Erlang grammar, producing a Green Tree that represents the concrete syntax.
- **AST**: Provides a type-safe Red Tree facade for easy traversal and analysis.
- **Language**: Defines the `ErlangLanguage` configuration and integration with the Oak framework.

## 🚀 Usage Example

### Basic Parsing

```rust
use oak_erlang::{ErlangParser, SourceText, ErlangLanguage};

fn parse_erlang_code(code: &str) {
    let source = SourceText::new(code);
    let config = ErlangLanguage::new();
    let parser = ErlangParser::new(&config);
    let result = parser.parse(&source);

    if result.is_success() {
        let root = result.root();
        println!("AST Root: {:?}", root);
    }
}
```

### Incremental Parsing

```rust
use oak_erlang::{ErlangParser, SourceText, ErlangLanguage};

fn incremental_update(old_code: &str, new_code: &str) {
    let config = ErlangLanguage::new();
    let mut parser = ErlangParser::new(&config);
    
    // Initial parse
    let initial_source = SourceText::new(old_code);
    let _ = parser.parse(&initial_source);
    
    // Incremental update
    let updated_source = SourceText::new(new_code);
    let result = parser.parse(&updated_source);
    
    if result.is_success() {
        println!("Incremental parse completed successfully.");
    }
}
```

## 🔍 Diagnostics

The parser provides detailed diagnostics for syntax errors, including error ranges and helpful messages.

```rust
let result = parser.parse(&source);
for diagnostic in result.diagnostics() {
    println!("Error at {:?}: {}", diagnostic.range(), diagnostic.message());
}
```
