# � ActionScript Parser User Guide
ActionScript support for the Oak language framework.
This guide helps you integrate `oak-actionscript` into your project and perform common parsing tasks efficiently.
## � Quick Start
### Basic Parsing Example
The following is a standard workflow for parsing an ActionScript class featuring metadata and E4X:
```rust
use oak_actionscript::{Parser, SourceText};
fn main() {
// 1. Prepare source code
let code = r#"
package com.example {
[Bindable]
public class User {
public var name:String;
public function toXML():XML {
return <user name={name}/>;
}
}
}
"#;
let source = SourceText::new(code);
// 2. Initialize parser
let parser = Parser::new();
// 3. Execute parsing
let result = parser.parse(&source);
// 4. Handle results
if result.is_success() {
println!("Parsing successful! AST node count: {}", result.node_count());
} else {
eprintln!("Errors found during parsing.");
}
}
```
## 🔍 Core Functionality
### 1. Syntax Tree Traversal
After a successful parse, use the built-in visitor pattern or manually traverse the Green/Red Tree to extract ActionScript-specific constructs like metadata tags (`[Bindable]`), E4X XML literals, or complex package/class hierarchies.
### 2. Incremental Parsing
Optimize performance by only re-parsing changed sections:
```rust
// Assuming you have an old parse result 'old_result' and new source text 'new_source'
let new_result = parser.reparse(&new_source, &old_result);
```
### 3. Diagnostics & Error Recovery
`oak-actionscript` provides detailed error contexts tailored for AS3, including support for legacy Flex/Flash syntax quirks:
```rust
for diag in result.diagnostics() {
println!("[{}:{}] {}", diag.line, diag.column, diag.message);
}
```
## 🛠️ Performance & Reliability
- **High-Fidelity AST**: Retains all trivia (whitespace and comments), making it ideal for code formatting and refactoring tools.
- **Fault Tolerance**: Automatically recovers from syntax errors to provide as much information as possible from the rest of the file.
- **Memory Efficiency**: Leverages immutable data structures (Green Trees) for low-overhead tree management.