CGrammar

A comprehensive C language grammar parser library written in Rust, implementing the C23 standard (ISO/IEC 9899:2023).

Language Support

This library supports all major C23 features including:

• Lexical Elements: Keywords, identifiers, constants, string literals, and punctuators
• Expressions: All expression types from primary expressions to complex compound expressions
• Declarations: Variable declarations, function declarations, and type declarations
• Statements: Control flow, loops, jumps, and compound statements
• Functions: Function definitions with parameter lists and variadic arguments
• Preprocessor: Basic preprocessing token support
• Modern C Features:
  • Binary constants (0b prefix)
  • Digit separators in numeric literals
  • _BitInt type specifier
  • typeof and typeof_unqual operators
  • _Decimal128, _Decimal32, _Decimal64 types
  • And many more C23 additions

Quick Start

Add this to your Cargo.toml:

[dependencies]
cgrammar = "0.2.0"

Basic Usage

use cgrammar::*;

fn main() {
    let source_code = r#"
        int main() {
            printf("Hello, World!\n");
            return 0;
        }
    "#;

    // Tokenize the source code
    let tokens = balanced_token_sequence().parse(source_code).unwrap();

    // Parse into AST
    let result = translation_unit().parse(tokens.as_input());

    if let Some(ast) = result.output() {
        println!("Successfully parsed!");
        println!("{:#?}", ast);
    } else {
        eprintln!("Parse failed!");
        // Handle errors...
    }
}

License

This project is licensed under the Apache-2.0 License - see the LICENSE file for details.