lib-ruby-parser 4.0.0+ruby-3.1.0

Ruby parser
Documentation 
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use crate::traverse::finder::Finder;
use crate::{Parser, ParserOptions};

fn find(src: &str, pattern: &str) -> Option<String> {
    let options = ParserOptions {
        buffer_name: "(find_test)".into(),
        record_tokens: false,
        ..Default::default()
    };
    let parser = Parser::new(src, options);

    let result = parser.do_parse();
    let ast = result.ast.as_ref().expect("expected AST to be Some");
    let node = Finder::run(&pattern, ast).unwrap()?;
    node.expression().source(&result.input)
}

#[test]
fn it_finds() {
    let src = "[1,2,3].each { |a| puts a + 1; 42 }";
    let pattern = "root -> body -> stmts -> 0 -> args -> 0";

    assert_eq!(Some("a + 1".to_string()), find(src, pattern))
}

#[test]
fn it_returns_none_if_no_node() {
    let src = "[1,2,3]";
    let pattern = "root -> stmts";

    assert_eq!(None, find(src, pattern))
}