void _fetchValue()

in lib/src/scanner.dart [706:746]
26 lines of code
5 McCabe index (conditional complexity)

  void _fetchValue() {
    var simpleKey = _simpleKeys.last;
    if (simpleKey != null) {
      // Add a [TokenType.KEY] directive before the first token of the simple
      // key so the parser knows that it's part of a key/value pair.
      _tokens.insert(simpleKey.tokenNumber - _tokensParsed,
          Token(TokenType.key, simpleKey.location.pointSpan() as FileSpan));

      // In the block context, we may need to add the
      // [TokenType.BLOCK_MAPPING_START] token.
      _rollIndent(
          simpleKey.column, TokenType.blockMappingStart, simpleKey.location,
          tokenNumber: simpleKey.tokenNumber);

      // Remove the simple key.
      _simpleKeys[_simpleKeys.length - 1] = null;

      // A simple key cannot follow another simple key.
      _simpleKeyAllowed = false;
    } else if (_inBlockContext) {
      if (!_simpleKeyAllowed) {
        throw YamlException(
            'Mapping values are not allowed here. Did you miss a colon '
            'earlier?',
            _scanner.emptySpan);
      }

      // If we're here, we've found the ':' indicator following a complex key.

      _rollIndent(
          _scanner.column, TokenType.blockMappingStart, _scanner.location);
      _simpleKeyAllowed = true;
    } else if (_simpleKeyAllowed) {
      // If we're here, we've found the ':' indicator with an empty key. This
      // behavior differs from libyaml, which disallows empty implicit keys.
      _simpleKeyAllowed = false;
      _addCharToken(TokenType.key);
    }

    _addCharToken(TokenType.value);
  }