parse method

@override Tuple1<E>? 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<E>? parse(ParseState state) {
  final r1 = p1.parse(state);
  if (r1 != null) {
    return r1;
  }

  final r2 = p2.parse(state);
  if (r2 != null) {
    return r2;
  }

  final r3 = p3.parse(state);
  if (r3 != null) {
    return r3;
  }

  final r4 = p4.parse(state);
  if (r4 != null) {
    return r4;
  }
}