Token _scanPlainScalar()

in lib/src/scanner.dart [1447:1525]
59 lines of code
21 McCabe index (conditional complexity)

  Token _scanPlainScalar() {
    var start = _scanner.state;
    var end = _scanner.state;
    var buffer = StringBuffer();
    var leadingBreak = '';
    var trailingBreaks = '';
    var whitespace = StringBuffer();
    var indent = _indent + 1;

    while (true) {
      // Check for a document indicator.
      if (_isDocumentIndicator) break;

      // Check for a comment.
      if (_scanner.peekChar() == HASH) break;

      if (_isPlainChar) {
        // Join the whitespace or fold line breaks.
        if (leadingBreak.isNotEmpty) {
          if (trailingBreaks.isEmpty) {
            buffer.writeCharCode(SP);
          } else {
            buffer.write(trailingBreaks);
          }
          leadingBreak = '';
          trailingBreaks = '';
        } else {
          buffer.write(whitespace);
          whitespace.clear();
        }
      }

      // libyaml's notion of valid identifiers differs substantially from YAML
      // 1.2's. We use [_isPlainChar] instead of libyaml's character here.
      var startPosition = _scanner.position;
      while (_isPlainChar) {
        _scanner.readChar();
      }
      buffer.write(_scanner.substring(startPosition));
      end = _scanner.state;

      // Is it the end?
      if (!_isBlank && !_isBreak) break;

      while (_isBlank || _isBreak) {
        if (_isBlank) {
          // Check for a tab character messing up the intendation.
          if (leadingBreak.isNotEmpty &&
              _scanner.column < indent &&
              _scanner.peekChar() == TAB) {
            _scanner.error('Expected a space but found a tab.', length: 1);
          }

          if (leadingBreak.isEmpty) {
            whitespace.writeCharCode(_scanner.readChar());
          } else {
            _scanner.readChar();
          }
        } else {
          // Check if it's a first line break.
          if (leadingBreak.isEmpty) {
            leadingBreak = _readLine();
            whitespace.clear();
          } else {
            trailingBreaks = _readLine();
          }
        }
      }

      // Check the indentation level.
      if (_inBlockContext && _scanner.column < indent) break;
    }

    // Allow a simple key after a plain scalar with leading blanks.
    if (leadingBreak.isNotEmpty) _simpleKeyAllowed = true;

    return ScalarToken(
        _scanner.spanFrom(start, end), buffer.toString(), ScalarStyle.PLAIN);
  }