parse method

@override Tuple1<String>? parse(ParseState state)

Parses input data actively and produces the result.

Returns Tuple1 of the result if parsing was successful; otherwise returns null.

final r1 = p.parse(state);

Implementation

@override
Tuple1<String>? parse(ParseState state) {
  final pos = state.pos;
  final data = state.data;
  if (pos + _length <= state.length) {
    final c = data.getUint16(pos, Endian.little);
    if (c == _c) {
      var ok = true;
      var newPos = pos + 2;
      for (var i = 1; i < s.length; i++) {
        final c = data.getUint16(newPos, Endian.little);
        if (c != s.codeUnitAt(i)) {
          ok = false;
          break;
        }

        newPos += 2;
      }

      if (ok) {
        state.pos = newPos;
        return _res;
      }
    }
  }

  state.pos = pos;
}