🚀 Oak C# Parser

Enterprise-Grade Power and Speed for .NET — A high-performance, incremental C# parser built on the Oak framework. Optimized for modern C# (12.0+) features, Roslyn-inspired architecture, and high-responsiveness developer tools.

🎯 Project Vision

C# is the cornerstone of the .NET ecosystem, and its rapid evolution brings complex syntax and powerful language features. oak-csharp aims to provide a robust, modern, Rust-powered infrastructure for parsing C# that is both accurate and incredibly fast. By utilizing Oak's incremental parsing architecture, we enable the creation of highly responsive IDEs, static analyzers, and refactoring tools that can handle massive C# solutions in real-time. Whether you are building custom linters, automated code generators, or sophisticated IDE extensions, oak-csharp provides the high-fidelity AST and efficiency needed to keep pace with C#'s continuous growth.

✨ Core Features

• ⚡ Blazing Fast: Leverages Rust's performance and memory safety to provide sub-millisecond parsing, essential for high-frequency developer tools and real-time analysis in large C# projects.
• 🔄 Incremental by Nature: Built-in support for partial updates—re-parse only what has changed. Ideal for large-scale C# solutions where maintainability and tool responsiveness are critical.
• 🌳 High-Fidelity AST: Generates a comprehensive and precise Abstract Syntax Tree capturing the full depth of modern C#:
  • Modern Features: Full support for Records, Pattern Matching, Init-only properties, and Primary Constructors.
  • Asynchronous Programming: Deep integration of async, await, and IAsyncEnumerable constructs.
  • LINQ: Precise parsing of Query Expressions and method-based LINQ syntax.
  • Generics & Attributes: Robust handling of complex generic constraints and attribute-based metadata.
  • Unsafe Code: Support for parsing unsafe blocks and pointer operations where necessary.
• 🛡️ Industrial-Grade Fault Tolerance: Engineered to recover from syntax errors gracefully, providing precise diagnostics—crucial for maintaining a smooth developer experience during active coding.
• 🧩 Deep Ecosystem Integration: Seamlessly works with oak-lsp for full LSP support and oak-mcp for intelligent code discovery and analysis.

🏗️ Architecture

The parser follows the Green/Red Tree architecture (inspired by Roslyn), which allows for:

1. Efficient Immutability: Share nodes across different versions of the tree without copying.
2. Lossless Syntax Trees: Retains all trivia (whitespace and comments), enabling faithful code formatting and refactoring.
3. Type Safety: Strongly-typed "Red" nodes provide a convenient and safe API for tree traversal and analysis.

🚀 Getting Started

Add oak-csharp to your Cargo.toml:

[dependencies]
oak-csharp = "0.1"

Quick Example

use oak_csharp::{CsharpParser, SourceText, CsharpLanguage};

fn main() {
    let code = r#"
        using System;

        namespace HelloWorld {
            public record Person(string Name, int Age);

            class Program {
                static void Main(string[] args) {
                    var person = new Person("Oak", 1);
                    Console.WriteLine($"Hello, {person.Name}!");
                }
            }
        }
    "#;
    let source = SourceText::new(code);
    let config = CsharpLanguage::new();
    let parser = CsharpParser::new(&config);
    let result = parser.parse(&source);

    if result.is_success() {
        println!("Parsing successful!");
        let root = result.root();
        // ... traverse the tree
    }
}

🤝 Contributing

We welcome contributions of all kinds! If you find a bug, have a feature request, or want to contribute code, please check our issues or submit a pull request.