run method

Implementation

@override
void run(
  CustomLintResolver resolver,
  ChangeReporter reporter,
  CustomLintContext context,
  SourceRange target,
) {
  context.registry.addFormalParameterList((node) {
    // parameter list has positional optional parameters, named params cannot be added
    if (node.leftDelimiter?.kind == TokenType.OPEN_SQUARE_BRACKET.kind) {
      return;
    }

    final parameters = node.parameters.where(
      (parameter) => parameter.isRequiredPositional,
    );

    final nextItem = parameters.skip(1).cast<SyntacticEntity>().followedBy([
      node.leftDelimiter ?? node.rightParenthesis,
    ]);

    final found = parameters
        .zip(nextItem)
        .map(
          (e) => (e.$1, SourceRange(e.$1.offset, e.$2.offset - e.$1.offset)),
        )
        .firstWhereOrNull((e) => target.intersects(e.$2));

    if (found == null) {
      return;
    }

    final (parameter, sourceRange) = found;

    reporter
        .createChangeBuilder(
          message: 'Convert to named formal parameter',
          priority: 1,
        )
        .addDartFileEdit((builder) {
          // delete positional parameter
          builder.addDeletion(sourceRange);

          final namedParam =
              '${Keyword.REQUIRED.lexeme} ${Keyword.THIS.lexeme}.${parameter.name},';

          if (node.leftDelimiter case final brace?) {
            // has named parameters, add to list
            builder.addSimpleInsertion(brace.offset + 1, namedParam);
          } else {
            // no named parameters, create
            builder.addSimpleInsertion(
              node.rightParenthesis.offset,
              '{$namedParam}',
            );
          }

          builder.format(node.sourceRange);
        });
  });
}