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Refine vertical punctuation logic based on Unicode standard - #3608
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Base the Unicode character blocks off of the official Unicode 9.0 character database. Refined the logic distinguishing upright, rotated, and neutral characters based on Unicode Technical Report 50 (with some simplifications). In particular, not everything in the General Punctuation block is treated as having neutral orientation; instead, the vertical punctuation table is consulted.
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lucaswoj
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Nov 14, 2016
| // 'Batak': (char) => char >= 0x1BC0 && char <= 0x1BFF, | ||
| // 'Lepcha': (char) => char >= 0x1C00 && char <= 0x1C4F, | ||
| // 'Ol Chiki': (char) => char >= 0x1C50 && char <= 0x1C7F, | ||
| // 'Cyrillic Extended-C': (char) => char >= 0x1C80 && char <= 0x1C8F, |
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Any idea how I might've missed this and other blocks the first time around?
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This block is new to Unicode 9.0, whereas the file you consulted was based on Unicode 8.0. I've updated this file to point to the Unicode Character Database, which will make it easier for us to keep this file up-to-date in the future (by diffing between Unicode releases).
| //if (isChar['CJK Unified Ideographs Extension C'](char)) return true; | ||
| //if (isChar['CJK Unified Ideographs Extension D'](char)) return true; | ||
| //if (isChar['CJK Unified Ideographs Extension E'](char)) return true; | ||
| //if (isChar['CJK Compatibility Ideographs Supplement'](char)) return true; |
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I'd prefer if this code block were copied into mapbox/DEPRECATED-mapbox-gl#29 than left commented out in the codebase.
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See mapbox/DEPRECATED-mapbox-gl#29 (comment) for an updated list.
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The list of Unicode character blocks is now based on the official Unicode 9.0 character database, whereas the previous table was based on an older Unicode standard.
The logic distinguishing upright, rotated, and neutral characters has been refined based on Unicode Technical Report #50 (proposed revision 16, which corresponds with Unicode 9.0).
Here are some example effects of this PR:
To keep things simple, the Letterlike Symbols and Number Forms blocks as a whole are considered neutrally oriented. We can refine that portion further if this simplification turns out to be problematic.
Depends on mapbox/mapbox-gl-test-suite#169 (although technically no test suite change was required because the differences were so minor).
/cc @lucaswoj @nickidlugash