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LibUnicode: Parse and generate per-locale plural rules from the CLDR
Plural rules in the CLDR are of the form: "cs": { "pluralRule-count-one": "i = 1 and v = 0 @integer 1", "pluralRule-count-few": "i = 2..4 and v = 0 @integer 2~4", "pluralRule-count-many": "v != 0 @decimal 0.0~1.5, 10.0, 100.0 ...", "pluralRule-count-other": "@integer 0, 5~19, 100, 1000, 10000 ..." } The syntax is described here: https://unicode.org/reports/tr35/tr35-numbers.html#Plural_rules_syntax There are up to 2 sets of rules for each locale, a cardinal set and an ordinal set. The approach here is to generate a C++ function for each set of rules. Each condition in the rules (e.g. "i = 1 and v = 0") is transpiled to a C++ if-statement within its function. Then lookup tables are generated to match locales to their generated functions. NOTE: -Wno-parentheses-equality is added to the LibUnicodeData compile flags because the generated plural rules have lots of extra parentheses (because e.g. we need to selectively negate and combine rules). The code to generate only exactly the right number of parentheses is quite hairy, so this just tells the compiler to ignore the extras.
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@ -2,4 +2,5 @@ lagom_tool(GenerateUnicodeData SOURCES GenerateUnicodeData.cpp LIBS LibMain)
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lagom_tool(GenerateUnicodeDateTimeFormat SOURCES GenerateUnicodeDateTimeFormat.cpp LIBS LibMain LibTimeZone)
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lagom_tool(GenerateUnicodeLocale SOURCES GenerateUnicodeLocale.cpp LIBS LibMain)
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lagom_tool(GenerateUnicodeNumberFormat SOURCES GenerateUnicodeNumberFormat.cpp LIBS LibMain)
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lagom_tool(GenerateUnicodePluralRules SOURCES GenerateUnicodePluralRules.cpp LIBS LibMain)
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lagom_tool(GenerateUnicodeRelativeTimeFormat SOURCES GenerateUnicodeRelativeTimeFormat.cpp LIBS LibMain)
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