ast-grep-language 0.42.1

Search and Rewrite code at large scale using precise AST pattern
Documentation 
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#![cfg(test)]
use super::*;

fn test_match(query: &str, source: &str) {
  use crate::test::test_match_lang;
  test_match_lang(query, source, Css);
}

#[test]
fn test_css_pattern() {
  test_match("$A { color: red; }", ".a { color: red; }");
  test_match(".a { color: $COLOR; }", ".a { color: red; }");
  test_match(".a { $PROP: red; }", ".a { color: red; }");
}

fn test_replace(src: &str, pattern: &str, replacer: &str) -> String {
  use crate::test::test_replace_lang;
  test_replace_lang(src, pattern, replacer, Css)
}

#[test]
fn test_css_replace() {
  let ret = test_replace(
    ".a {color: red; }",
    ".a { color: $COLOR}",
    ".a {background: $COLOR}",
  );
  assert_eq!(ret, ".a {background: red}");
}