Oak C# Parser

High-performance incremental C# parser for the oak ecosystem with flexible configuration, optimized for code analysis and compilation.

🎯 Overview

Oak C# is a robust parser for C#, designed to handle complete C# syntax including modern features. Built on the solid foundation of oak-core, it provides both high-level convenience and detailed AST generation for static analysis and code generation.

✨ Features

• Complete C# Syntax: Supports all C# features including modern specifications
• Full AST Generation: Generates comprehensive Abstract Syntax Trees
• Lexer Support: Built-in tokenization with proper span information
• Error Recovery: Graceful handling of syntax errors with detailed diagnostics

🚀 Quick Start

Basic example:

use oak_core::{Parser, SourceText, parser::session::ParseSession};
use oak_csharp::{CSharpParser, CSharpLanguage};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let mut session = ParseSession::<CSharpLanguage>::default();
    let parser = CSharpParser::new();
    let source = SourceText::new(r#"
using System;

class Program {
    static void Main() {
        Console.WriteLine("Hello, C#!");
    }
}
    "#);
    
    let result = parser.parse(&[], &mut session);
    println!("Parsed C# successfully.");
    Ok(())
}

📋 Parsing Examples

Class Parsing

use oak_core::{Parser, SourceText, parser::session::ParseSession};
use oak_csharp::{CSharpParser, CSharpLanguage};

let mut session = ParseSession::<CSharpLanguage>::default();
let parser = CSharpParser::new();
let source = SourceText::new(r#"
public class Calculator {
    public int Add(int a, int b) {
        return a + b;
    }
    
    public int Subtract(int a, int b) {
        return a - b;
    }
}
"#);

let result = parser.parse(&[], &mut session);
println!("Class parsed successfully.");

Interface Parsing

use oak_core::{Parser, SourceText, parser::session::ParseSession};
use oak_csharp::{CSharpParser, CSharpLanguage};

let mut session = ParseSession::<CSharpLanguage>::default();
let parser = CSharpParser::new();
let source = SourceText::new(r#"
public interface IDrawable {
    void Draw();
    double Area { get; }
}

public class Circle : IDrawable {
    public double Radius { get; set; }
    
    public void Draw() {
        Console.WriteLine($"Drawing circle with radius {Radius}");
    }
    
    public double Area => Math.PI * Radius * Radius;
}
"#);

let result = parser.parse(&[], &mut session);
println!("Interface parsed successfully.");

🔧 Advanced Features

Token-Level Parsing

use oak_core::{Parser, SourceText, parser::session::ParseSession};
use oak_csharp::{CSharpParser, CSharpLanguage};

let mut session = ParseSession::<CSharpLanguage>::default();
let parser = CSharpParser::new();
let source = SourceText::new("int x = 42;");
let result = parser.parse(&[], &mut session);
println!("Token parsing completed.");

Error Handling

use oak_core::{Parser, SourceText, parser::session::ParseSession};
use oak_csharp::{CSharpParser, CSharpLanguage};

let mut session = ParseSession::<CSharpLanguage>::default();
let parser = CSharpParser::new();
let source = SourceText::new(r#"
public class Calculator {
    public int Add(int a, int b) {
        return a + b
    }
}
# Missing semicolon
"#);

let result = parser.parse(&[], &mut session);
if let Some(errors) = result.result.err() {
    println!("Parse errors found: {:?}", errors);
} else {
    println!("Parsed successfully.");
}

🏗️ AST Structure

The parser generates a comprehensive AST with the following main structures:

• CompilationUnit: Root container for C# programs
• ClassDeclaration: C# class definitions
• InterfaceDeclaration: Interface definitions
• MethodDeclaration: Method declarations
• PropertyDeclaration: Property declarations
• Statement: Various statement types
• Expression: Various expression types

📊 Performance

• Streaming: Parse large C# files without loading entirely into memory
• Incremental: Re-parse only changed sections
• Memory Efficient: Smart AST node allocation
• Fast Recovery: Quick error recovery for better IDE integration

🔗 Integration

Oak C# integrates seamlessly with:

• Static Analysis: Code quality and security analysis
• Code Generation: Generating code from C# AST
• IDE Support: Language server protocol compatibility
• Refactoring: Automated code refactoring
• Documentation: Generating documentation from C# code

📚 Examples

Check out the examples directory for comprehensive examples:

• Complete C# program parsing
• Class and interface analysis
• Code transformation
• Integration with development workflows

🤝 Contributing

Contributions are welcome!

Please feel free to submit pull requests at the project repository or open issues.