Rust

Rust is hyperlark’s native engine — the same core the Python, WASM, and C bindings wrap. The hyperlark crate builds grammar tables at runtime (no code generation) and returns a self-describing parse result.

Install

cargo add hyperlark

Your first parser

use hyperlark::Lark;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let lark = Lark::new(
        "start: \"hello\" NAME\nNAME: /\\w+/\n%ignore \" \"",
    )?;
    let result = lark.parse("hello world")?;
    println!("{}", result.pretty());
    Ok(())
}

Lark::new builds an LALR parser under all-defaults; Lark::lalr / Lark::earley name the engine, and any other option is a field-init LarkOptions passed to Lark::from_lark_source.

Walking the tree

parse returns a ParseResult — an owned tree plus the table its ids index. Walk it with a Cursor, or query by name:

let result = lark.parse("hello world")?;
for tok in result.find_token("NAME") {
    println!("NAME = {}", tok.value);
}

Next steps

• Grammar reference — the .lark grammar language.
• Feature matrix — what each target supports.
• Alternatives — hyperlark vs nom, pest, lalrpop, tree-sitter.
• API reference — docs.rs/hyperlark (once published).