Token _scanAnchor()

in lib/src/scanner.dart [958:992]
28 lines of code
13 McCabe index (conditional complexity)

  Token _scanAnchor({bool anchor = true}) {
    var start = _scanner.state;

    // Eat the indicator character.
    _scanner.readChar();

    // libyaml only allows word characters in anchor names, but the spec
    // disagrees: http://yaml.org/spec/1.2/spec.html#ns-anchor-char.
    var startPosition = _scanner.position;
    while (_isAnchorChar) {
      _scanner.readChar();
    }
    var name = _scanner.substring(startPosition);

    var next = _scanner.peekChar();
    if (name.isEmpty ||
        (!_isBlankOrEnd &&
            next != QUESTION &&
            next != COLON &&
            next != COMMA &&
            next != RIGHT_SQUARE &&
            next != RIGHT_CURLY &&
            next != PERCENT &&
            next != AT &&
            next != GRAVE_ACCENT)) {
      throw YamlException(
          'Expected alphanumeric character.', _scanner.emptySpan);
    }

    if (anchor) {
      return AnchorToken(_scanner.spanFrom(start), name);
    } else {
      return AliasToken(_scanner.spanFrom(start), name);
    }
  }