Regional indicators in the trie instead of if's

[clipperhouse]

Encode regional indicators into the trie instead of if’s.

Also, asciiWidth tables are too much complication, just make that a conditional.

[Copilot]

Pull request overview

This PR refactors the handling of Regional Indicator characters by encoding them into the trie data structure instead of using runtime if-statement checks. It also simplifies ASCII width calculation by replacing lookup tables with a conditional function.

Key changes:

• Adds a new _Regional_Indicator property type to the trie
• Removes the isRIPrefix() helper and associated runtime checks
• Replaces asciiWidths and asciiProperties lookup tables with an asciiWidth() function

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
width.go	Removes isRIPrefix() function and regional indicator byte-checking logic; adds property-based regional indicator handling in lookupProperties(); replaces asciiWidths table lookups with asciiWidth() function calls
tables.go	Replaces asciiWidths and asciiProperties lookup tables with a simple asciiWidth() function; extends propertyWidths array to include _Regional_Indicator
trie.go	Adds _Regional_Indicator constant; updates generated trie data to encode regional indicators as property value 0x0005
width_test.go	Adds test case for single Regional Indicator character
tables_test.go	Adds new test file with comprehensive tests for asciiWidth() function
internal/gen/unicode.go	Updates Unicode data parser to identify and encode Regional Indicator characters in the trie

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[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

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[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

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[clipperhouse]

See e4aab45