void _visitTrailingCommaParameterList()

in lib/src/source_visitor.dart [3265:3323]
37 lines of code
8 McCabe index (conditional complexity)

  void _visitTrailingCommaParameterList(FormalParameterList parameters) {
    // Can't have a trailing comma if there are no parameters.
    assert(parameters.parameters.isNotEmpty);

    _metadataRules.add(MetadataRule());

    // Always split the parameters.
    builder.startRule(Rule.hard());

    token(parameters.leftParenthesis);

    // Find the parameter immediately preceding the optional parameters (if
    // there are any).
    FormalParameter? lastRequired;
    for (var i = 0; i < parameters.parameters.length; i++) {
      if (parameters.parameters[i] is DefaultFormalParameter) {
        if (i > 0) lastRequired = parameters.parameters[i - 1];
        break;
      }
    }

    // If all parameters are optional, put the "[" or "{" right after "(".
    if (parameters.parameters.first is DefaultFormalParameter) {
      token(parameters.leftDelimiter);
    }

    // Process the parameters as a separate set of chunks.
    builder = builder.startBlock(null);

    for (var parameter in parameters.parameters) {
      visit(parameter);
      _writeCommaAfter(parameter);

      // If the optional parameters start after this one, put the delimiter
      // at the end of its line.
      if (parameter == lastRequired) {
        space();
        token(parameters.leftDelimiter);
        lastRequired = null;
      }

      newline();
    }

    // Put comments before the closing ")", "]", or "}" inside the block.
    var firstDelimiter =
        parameters.rightDelimiter ?? parameters.rightParenthesis;
    writePrecedingCommentsAndNewlines(firstDelimiter);
    builder = builder.endBlock(null, forceSplit: true);
    builder.endRule();

    _metadataRules.removeLast();

    // Now write the delimiter itself.
    _writeText(firstDelimiter.lexeme, firstDelimiter.offset);
    if (firstDelimiter != parameters.rightParenthesis) {
      token(parameters.rightParenthesis);
    }
  }