f68a0449ed
`parse_tt` needs a way to get from within submatchers make to the enclosing submatchers. Currently it has two distinct mechanisms for this: - `Delimited` submatchers use `MatcherPos::stack` to record stuff about the parent (and further back ancestors). - `Sequence` submatchers use `MatcherPosSequence::parent` to point to the parent matcher position. Having two mechanisms is really confusing, and it took me a long time to understand all this. This commit eliminates `MatcherPos::stack`, and changes `Delimited` submatchers to use the same mechanism as sequence submatchers. That mechanism is also changed a bit: instead of storing the entire parent `MatcherPos`, we now only store the necessary parts from the parent `MatcherPos`. Overall this is a small performance win, with the positives outweighing the negatives, but it's mostly for clarity. |
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| Cargo.toml | ||