Queue _parseBlock()

in lib/message_format.dart [557:596]
38 lines of code
8 McCabe index (conditional complexity)

  Queue<_BlockTypeAndVal> _parseBlock(String pattern) {
    var result = Queue<_BlockTypeAndVal>();
    var parts = _extractParts(pattern);
    for (var thePart in parts) {
      _BlockTypeAndVal? block;
      if (_ElementType.string == thePart._type) {
        block = _BlockTypeAndVal(_BlockType.string, thePart._value);
      } else if (_ElementType.block == thePart._type) {
        _checkAndThrow(thePart._value is String,
            'The value should be a string: ${thePart._value}');
        var blockType = _parseBlockType(thePart._value);

        switch (blockType) {
          case _BlockType.select:
            block = _BlockTypeAndVal(
                _BlockType.select, _parseSelectBlock(thePart._value));
            break;
          case _BlockType.plural:
            block = _BlockTypeAndVal(
                _BlockType.plural, _parsePluralBlock(thePart._value));
            break;
          case _BlockType.ordinal:
            block = _BlockTypeAndVal(
                _BlockType.ordinal, _parseOrdinalBlock(thePart._value));
            break;
          case _BlockType.simple:
            block = _BlockTypeAndVal(_BlockType.simple, thePart._value);
            break;
          default:
            _checkAndThrow(
                false, 'Unknown block type for pattern: ${thePart._value}');
        }
      } else {
        _checkAndThrow(false, 'Unknown part of the pattern.');
      }
      result.add(block!);
    }

    return result;
  }