resolve method

Future<List<ConstructorParameter>> resolve(File file)

Resolves constructor parameters declared in the provided file.

Returns an empty list if the file does not exist or if no matching constructor declaration is found.

Implementation

Future<List<ConstructorParameter>> resolve(File file) async {
  if (!file.existsSync()) return const [];

  final content = await file.readAsString();

  final constructor = RegExp(r'(?:const\s+)?\w+\s*\(\{([\s\S]*?)\}\)', multiLine: true);

  final match = constructor.firstMatch(content);

  if (match == null) return const [];

  final body = match.group(1)!;

  final parameters = <ConstructorParameter>[];

  for (final rawLine in body.split('\n')) {
    var line = rawLine.trim();

    if (line.isEmpty) continue;

    // remove trailing comma
    if (line.endsWith(',')) line = line.substring(0, line.length - 1);

    final isRequired = line.startsWith('required ');

    if (isRequired) line = line.substring('required '.length);

    // Handle initializing formal parameters (this.name)
    if (line.startsWith('this.')) {
      final name = line.substring('this.'.length);
      parameters.add(ConstructorParameter(
        type: '', name: name, isNamed: true, isRequired: isRequired,
      ));
      continue;
    }

    final parts = line.split(RegExp(r'\s+'));

    if (parts.length != 2) continue;

    parameters.add(ConstructorParameter(type: parts[0], name: parts[1], isNamed: true, isRequired: isRequired));
  }

  return parameters;
}