Upgrade from Winnow 0.4 to 0.5 #214
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GuillaumeGomez
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In 0.4, `parse_next` and `parse_peek` are the same. In 0.5, `parse_next`s signature will change. By switching to `parse_peek` now, we can make it so we gradually adopt the new `parse_next` signature.
In 0.4, `unpeek` is a no-op. In 0.5, the `FnMut` signature impled for `Parser` changes and `unpeek` will take the old signature and adapt it to work. This allows us to more gradually migrate to the new `FnMut` signature. Yes, the name `unpeek` isn't ideal but its only transitional.
Note: `tests::fuzzed_target_recursion` fails on debug builds because of the extra overhead from the deprecated APIs adapting to their non-deprecated forms
I had considered making the input a `&mut &str` but didn't really see the benefit, especially at this stage. That can always be changed later.
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The biggest change in this release is switching from
Fn(I) -> Result<(I, O, E>toFn(&mut I) -> Result<O, E>. This offers better ergonomics and performance. "Checkpoints" were introduced as a way to save off a specific location and return to it later, replacing the input juggling done before.To make this major shift more doable, compatibility APis were added.
parse_peekis like the newparse_nextexcept it has the old signature.unpeekturns the old signature into the new one. These are terrible names but meant to be short-lived in a code base.