sourceInterval property

  1. @override
Interval sourceInterval
override

Return an Interval indicating the index in the TokenStream of the first and last token associated with this subtree. If this node is a leaf, then the interval represents a single token and has interval i..i for token index i.

An interval of i..i-1 indicates an empty interval at position i in the input stream, where 0 <= i <= the size of the input token stream. Currently, the code base can only have i=0..n-1 but in concept one could have an empty interval after EOF.

If source interval is unknown, this returns {@link Interval#INVALID}.

As a weird special case, the source interval for rules matched after EOF is unspecified.

Implementation

@override
Interval get sourceInterval {
  //if (symbol == null) return Interval.INVALID; Todo: review this nullability that nobody kind of defines, change here or change on to String

  final tokenIndex = symbol.tokenIndex;
  return Interval(tokenIndex, tokenIndex);
}