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  1. Qt
  2. QTBUG-79902

QLocale: make fuller and more faithful use of the CLDR data

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    • Icon: User Story User Story
    • Resolution: Unresolved
    • Icon: P2: Important P2: Important
    • 6.x
    • None
    • Core: Locales (i18n)
    • None

      There are various ways that we fail to use CLDR fully and faithfully. At least:

      • CLDR's date-time formatting is richer than ours
      • CLDR distinguishes number formatting for percentages from that for currencies and ordinary numbers
      • Some number formats have separators in a different pattern than the "thousands" pattern currently assumed
      • CLDR locales can have variants (e.g. POSIX variant of C and Valencian variant of Catalan)
      • Some fields that QLocaleData expects to store in a single QChar need a surrogate pair in at least some locales
      • CLDR has more distinctions than just singular/plural when it comes to varying the forms of texts

      The first two (at least) shall require incompatible API and behaviour changes.
      All shall require significant re-working of QLocale and its associated classes.

      Formatting of dates is handled rather clumsily between Q(Date|Time)+, QCalendar and QLocale. Some rationalisation of this following the addition of calendars (and the movement of some locale-specific data into the care of calendars rather than QLocale itself) shall likely be advantageous also.

      Adding support for percentages to our existing (currency and) number formatting will complicate the APIs (in QLocale, QString, QByteArray and likely others), making this a good moment to streamline the existing APIs as far as possible.

      All of the formatting-related aspects of this (and linked tasks) should be designed with an eye to eventual C++20 <format>-compatibility.

        1.
        		 Add support for locale variants, e.g. @Catalan Technical task Open Edward Welbourne

        0%
        Original Estimate - 1 week
        Remaining Estimate - 1 week
        2.
        		 Format percentages distinctly from currencies and ordinary numbers Technical task Open Edward Welbourne

        0%
        Original Estimate - 2 weeks
        Remaining Estimate - 2 weeks
        3.
        		 Add QDateTimeFormat based on CLDR's format strings Technical task Open Edward Welbourne

        0%
        Original Estimate - 4 weeks
        Remaining Estimate - 4 weeks
        4.
        		 Research CLDR's singular/plural/... subtleties and decide what to support Technical task Open Edward Welbourne

        0%
        Original Estimate - 3 weeks
        Remaining Estimate - 3 weeks
        5.
        		 Support all CLDR's various ways of naming time-zones Technical task Open Edward Welbourne  
        For Gerrit Dashboard: QTBUG-79902
        # Subject Branch Project Status CR V
        288200,2 Ensure we use UTF-8 for the emitted QLocaleXML data file dev qt/qtbase Status: MERGED +2 0
        293934,10 Take number system into account in currency format look-up 5.15 qt/qtbase Status: MERGED +2 0
        294144,7 Change QLocale to use CLDR's accounting formats for currencies 5.15 qt/qtbase Status: MERGED +2 0
        294245,2 Ensure we use UTF-8 for the emitted QLocaleXML data file 5.15 qt/qtbase Status: MERGED +2 0

            Eddy Edward Welbourne
            Eddy Edward Welbourne
            Vladimir Minenko Vladimir Minenko
            Alex Blasche Alex Blasche
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              Created:
              Updated:

                Estimated:
                Original Estimate - 16 weeks
                16w
                Remaining:
                Remaining Estimate - 16 weeks
                16w
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