run method

Implementation

@override
(MutableStringSlice, MutableStringSlice) run(MutableStringSlice input) {
  if (input.startsWith(literalSlice)) {
    final result = literalSlice;
    input.skiping(literalSlice.length);
    return (result, input);
  }
  throw ParserError(
    expected: literal,
    remainingInput: input,
  );
}