Token finishIdentifier()

in lib/src/tokenizer.dart [267:322]
38 lines of code
15 McCabe index (conditional complexity)

  Token finishIdentifier() {
    // If we encounter an escape sequence, remember it so we can post-process
    // to unescape.
    var chars = <int>[];

    // backup so we can start with the first character
    var validateFrom = _index;
    _index = _startIndex;
    while (_index < _text.length) {
      var ch = _text.codeUnitAt(_index);

      // If the previous character was "\" we need to escape. T
      // http://www.w3.org/TR/CSS21/syndata.html#characters
      // if followed by hexadecimal digits, create the appropriate character.
      // otherwise, include the character in the identifier and don't treat it
      // specially.
      if (ch == 92 /*\*/ && _inString) {
        var startHex = ++_index;
        eatHexDigits(startHex + 6);
        if (_index != startHex) {
          // Parse the hex digits and add that character.
          chars.add(int.parse('0x' + _text.substring(startHex, _index)));

          if (_index == _text.length) break;

          // if we stopped the hex because of a whitespace char, skip it
          ch = _text.codeUnitAt(_index);
          if (_index - startHex != 6 &&
              (ch == TokenChar.SPACE ||
                  ch == TokenChar.TAB ||
                  ch == TokenChar.RETURN ||
                  ch == TokenChar.NEWLINE)) {
            _index++;
          }
        } else {
          // not a digit, just add the next character literally
          if (_index == _text.length) break;
          chars.add(_text.codeUnitAt(_index++));
        }
      } else if (_index < validateFrom ||
          (inSelectorExpression
              ? TokenizerHelpers.isIdentifierPartExpr(ch)
              : TokenizerHelpers.isIdentifierPart(ch))) {
        chars.add(ch);
        _index++;
      } else {
        // Not an identifier or escaped character.
        break;
      }
    }

    var span = _file.span(_startIndex, _index);
    var text = String.fromCharCodes(chars);

    return IdentifierToken(text, getIdentifierKind(), span);
  }