[5.8][stdlib] Export grapheme breaking facility #62863
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Instead of just checking the number of breaks in each test case, expose and check the actual positions of those breaks, too.
This turns _GraphemeBreakingState into a more proper state machine, although it is only able to recognize breaks in the forward direction. The backward direction requires arbitrarily long lookback, and it currently remains in _StringGuts.
`Unicode._CharacterRecognizer` is a newly exported opaque type that exposes the stdlib’s extended grapheme cluster breaking facility, independent of `String`. This essentially makes the underlying simple state machine public, without exposing any of the (unstable) Unicode details. The ability to perform grapheme breaking over, say, the scalars stored in multiple `String` values can be extremely useful while building custom text processing algorithms and data structures. Ideally this would eventually become API, but before proposing this to Swift Evolution, I’d like to prove the shape of the type in actual use (and we’ll also need to find better names for its operations).
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Azoy
approved these changes
Jan 5, 2023
AnthonyLatsis
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🍒 release cherry pick
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Cherry-picked from #62794.
Unicode._CharacterRecognizeris a newly exported opaque type that exposes the stdlib’s extended grapheme cluster breaking facility, independent ofString.This essentially makes the underlying simple state machine public, without exposing any of the (unstable) Unicode details.
The ability to perform grapheme breaking over, say, the scalars stored in multiple
Stringvalues can be extremely useful while building custom text processing algorithms and data structures.Ideally this would eventually become API, but before proposing this to Swift Evolution, I’d like to prove the shape of the type in actual use (and we’ll also need to find better names for its operations).
rdar://103903565