parse method

Implementation

@override
Result<int>? parse(State<StringReader> state) {
  if (char < 0 || char > 0x10ffff) {
    throw RangeError.range(char, 0, 0x10ffff);
  }

  final input = state.input;
  if (state.pos < input.length) {
    if (input.readChar(state.pos) == char) {
      state.pos += input.count;
      return Result(char);
    }
  }

  return state.fail(ErrorExpectedCharacter(char));
}