# C source lexer in Rust

[![github](https://img.shields.io/badge/github-katyo/clex-8da0cb.svg?style=for-the-badge&logo=github)](https://github.com/katyo/clex)
[![crate](https://img.shields.io/crates/v/clex.svg?style=for-the-badge&color=fc8d62&logo=rust)](https://crates.io/crates/clex)
[![docs](https://img.shields.io/badge/docs.rs-clex-66c2a5?style=for-the-badge&logo=data:image/svg+xml;base64,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)](https://docs.rs/clex)
[![MIT](https://img.shields.io/badge/License-MIT-brightgreen.svg?style=for-the-badge)](https://opensource.org/licenses/MIT)
[![CI](https://img.shields.io/github/workflow/status/katyo/clex/Rust?style=for-the-badge&logo=github-actions&logoColor=white)](https://github.com/katyo/clex/actions?query=workflow%3ARust)

This is a fast and robust C source lexer in Rust. For example it can be used to extract some metadata from sources like comments or strings.

## Library usage

```rust
use clex::{Lexer, Token};

let src = r#"
static const char *s = "world";

int main() {
  // Hello world
  printf("Hello %s\n", s);

  return 0;
}
"#;

for lexeme in Lexer::from(src) {
  match lexeme.token {
    Token::Comment => {
      println!("comment: {:?}", lexeme.comment().unwrap());
    }
    Token::String => {
      println!("string: {:?}", lexeme.string().unwrap());
    }
    _ => {}
  }
}
```

This example prints the following:

```text
string: "world"
comment: "Hello world"
string: "Hello %s\n"
```

## Command-line usage

Currently command-line tool is used to test this library.
You can use it to analyze variuos C-sources and extract data.