SimpleSelectorSequence? simpleSelectorSequence()

in lib/parser.dart [1355:1406]

• 42 lines of code
• 15 McCabe index (conditional complexity)

  SimpleSelectorSequence? simpleSelectorSequence(bool forceCombinatorNone) {
    var start = _peekToken.span;
    var combinatorType = TokenKind.COMBINATOR_NONE;
    var thisOperator = false;

    switch (_peek()) {
      case TokenKind.PLUS:
        _eat(TokenKind.PLUS);
        combinatorType = TokenKind.COMBINATOR_PLUS;
        break;
      case TokenKind.GREATER:
        _eat(TokenKind.GREATER);
        combinatorType = TokenKind.COMBINATOR_GREATER;
        break;
      case TokenKind.TILDE:
        _eat(TokenKind.TILDE);
        combinatorType = TokenKind.COMBINATOR_TILDE;
        break;
      case TokenKind.AMPERSAND:
        _eat(TokenKind.AMPERSAND);
        thisOperator = true;
        break;
    }

    // Check if WHITESPACE existed between tokens if so we're descendent.
    if (combinatorType == TokenKind.COMBINATOR_NONE && !forceCombinatorNone) {
      if (_previousToken != null && _previousToken!.end != _peekToken.start) {
        combinatorType = TokenKind.COMBINATOR_DESCENDANT;
      }
    }

    var span = _makeSpan(start);
    var simpleSel = thisOperator
        ? ElementSelector(ThisOperator(span), span)
        : simpleSelector();
    if (simpleSel == null &&
        (combinatorType == TokenKind.COMBINATOR_PLUS ||
            combinatorType == TokenKind.COMBINATOR_GREATER ||
            combinatorType == TokenKind.COMBINATOR_TILDE)) {
      // For "+ &", "~ &" or "> &" a selector sequence with no name is needed
      // so that the & will have a combinator too.  This is needed to
      // disambiguate selector expressions:
      //    .foo&:hover     combinator before & is NONE
      //    .foo &          combinator before & is DESCDENDANT
      //    .foo > &        combinator before & is GREATER
      simpleSel = ElementSelector(Identifier('', span), span);
    }
    if (simpleSel != null) {
      return SimpleSelectorSequence(simpleSel, span, combinatorType);
    }
    return null;
  }