[Webkit-unassigned] [Bug 197775] Impossible to achieve proper Greek capitalization

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=197775

--- Comment #1 from Yusuke Suzuki <ysuzuki at apple.com> ---
Right. We should call ICU function to convert to upper/lower case if locale is, az, el, lt, tr.

In JavaScriptCore, we are maintaining this list in  Source/JavaScriptCore/runtime/StringPrototype.cpp because this is what ECMAScript spec specifies.

  1589     // 10. Let availableLocales be a List with the language tags of the languages for which the Unicode character database contains language sensitive case mappings.
  1590     // Note 1: As of Unicode 5.1, the availableLocales list contains the elements "az", "el", "lt", and "tr".
  1591     // 11. Let locale be BestAvailableLocale(availableLocales, noExtensionsLocale).
  1592     String locale = bestAvailableLocale(noExtensionsLocale, [](const String& candidate) {
  1593         if (candidate.length() != 2)
  1594             return false;
  1595         switch (computeTwoCharacters16Code(candidate)) {
  1596         case computeTwoCharacters16Code("az"_s):
  1597         case computeTwoCharacters16Code("el"_s):
  1598         case computeTwoCharacters16Code("lt"_s):
  1599         case computeTwoCharacters16Code("tr"_s):
  1600             return true;
  1601         default:
  1602             return false;
  1603         }
  1604     });
  1605
  1606     // 12. If locale is undefined, let locale be "und".
  1607     if (locale.isNull())
  1608         locale = "und"_s;
  1609
  1610     //

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