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Treat emoji presentation sequences as fullwidth#35

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Jules-Bertholet wants to merge13 commits intounicode-rs:masterfromJules-Bertholet:emoji-presentation
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Treat emoji presentation sequences as fullwidth#35

Jules-Bertholet wants to merge13 commits intounicode-rs:masterfromJules-Bertholet:emoji-presentation

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@Jules-Bertholet
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@Jules-BertholetJules-Bertholet commentedFeb 10, 2024•
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UAX11 says:

[UTS51]emoji presentation sequences behave as though they wereEast Asian Wide, regardless of their assigned East_Asian_Width property value.

Lookup is done with a 2-level trie.

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@Jules-Bertholet
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In terms ofUTS 51 conformance, with this PR, this crate will give the correct widths for:

However, it may overestimate (though never underestimate) the rendered widths of:

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Jules-Bertholet commentedFeb 14, 2024•
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I've replaced the binary search with a better datastructure, and also added a section in the rustdoc documenting the full width rules.

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The not-yet-released Unicode 16 adds 8 new non-emoji standardized variation sequences that affect width:https://unicode.org/alloc/Pipeline.html#variation_sequences,https://www.unicode.org/L2/L2023/23212r-quotes-svs-proposal.pdf. In time, we'll need to support those as well.

@Jules-BertholetJules-Bertholet mentioned this pull requestApr 23, 2024
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This PR is bloated, I'm splitting it up.

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@ManishearthManishearthAwaiting requested review from Manishearth

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@Jules-Bertholet@Manishearth
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