parse method

Implementation

@override
Result<String>? parse(State<StringReader> state) {
  final input = state.input;
  final list = <String>[];
  var str = '';
  while (state.pos < input.length) {
    final pos = state.pos;
    str = '';
    var c = -1;
    while (state.pos < input.length) {
      c = input.readChar(state.pos);
      final ok = isNormalChar(c);
      if (!ok) {
        break;
      }

      state.pos += input.count;
    }

    if (state.pos != pos) {
      str = input.substring(pos, state.pos);
      if (list.isNotEmpty) {
        list.add(str);
      }
    }

    if (c != controlChar) {
      break;
    }

    state.pos += 1;
    final r = escapeChar.parse(state);
    if (r == null) {
      state.pos = pos;
      break;
    }

    if (list.isEmpty && str != '') {
      list.add(str);
    }

    list.add(r.value);
  }

  if (list.isEmpty) {
    return Result(str);
  }

  return Result(list.join());
}