Map _parsePluralBlock()

in lib/message_format.dart [644:692]
41 lines of code
4 McCabe index (conditional complexity)

  Map<String, Object> _parsePluralBlock(String pattern) {
    var argumentName = '';
    var argumentOffset = 0;
    var replaceRegex = _pluralBlockRe;
    pattern = pattern.replaceFirstMapped(replaceRegex, (match) {
      // string, name, offset
      argumentName = match.group(1)!;
      if (_isDef(match.group(2))) {
        argumentOffset = int.parse(match.group(2)!);
      }
      return '';
    });

    var result = {
      'argumentName': argumentName,
      'argumentOffset': argumentOffset
    };

    var parts = _extractParts(pattern);
    // Looking for (key block)+ sequence.
    var pos = 0;
    while (pos < parts.length) {
      var thePart = parts.elementAt(pos);
      _checkAndThrow(thePart._value is String, 'Missing plural key element.');
      var key = thePart._value;

      pos++;
      _checkAndThrow(
          pos < parts.length, 'Missing or invalid plural value element.');
      thePart = parts.elementAt(pos);

      Queue<_BlockTypeAndVal>? value;
      if (_ElementType.block == thePart._type) {
        value = _parseBlock(thePart._value);
      } else {
        _checkAndThrow(false, 'Expected block type.');
      }
      key = key.replaceFirstMapped(RegExp('\\s*(?:=)?(\\w+)\\s*'), (match) {
        return match.group(1).toString();
      });
      result[key] = value!;
      pos++;
    }

    _checkAndThrow(
        result.containsKey(_other), 'Missing other key in plural statement.');

    return result;
  }