registryKeys function

List<String> registryKeys(String file, { required String variable, required String type, })

The keys of the Map<String, <type>> <variable> registry declared in file, skipping commented-out entries.

Returns an empty list when file has no such map.

Implementation

List<String> registryKeys(
  String file, {
  required String variable,
  required String type,
}) {
  final RegExpMatch? map =
      _guardedMap(variable, type).firstMatch(file) ??
      _plainMap(variable, type).firstMatch(file);
  if (map == null) return const [];
  // Strings and comments are matched whole, left to right, so a quote inside
  // a comment or a value is never read as the start of a key.
  return [
    for (final RegExpMatch token in RegExp(
      r'''\'([^'\n]*)'(\s*:)?|"([^"\n]*)"(\s*:)?|//[^\n]*|/\*[\s\S]*?\*/''',
    ).allMatches(map.group(1)!))
      if (token.group(2) != null)
        token.group(1)!
      else if (token.group(4) != null)
        token.group(3)!,
  ];
}