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LibJS+LibUnicode: Fully implement currency number formatting

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Currencies are a bit strange; the layout of currency data in the CLDR is
not particularly compatible with what ECMA-402 expects. For example, the
currency format in the "en" and "ar" locales for the Latin script are:

    en: "¤#,##0.00"
    ar: "¤\u00A0#,##0.00"

Note how the "ar" locale has a non-breaking space after the currency
symbol (¤), but "en" does not. This does not mean that this space will
appear in the "ar"-formatted string, nor does it mean that a space won't
appear in the "en"-formatted string. This is a runtime decision based on
the currency display chosen by the user ("$" vs. "USD" vs. "US dollar")
and other rules in the Unicode TR-35 spec.

ECMA-402 shies away from the nuances here with "implementation-defined"
steps. LibUnicode will store the data parsed from the CLDR however it is
presented; making decisions about spacing, etc. will occur at runtime
based on user input.
This commit is contained in:
Timothy Flynn 2021-11-12 23:16:37 -05:00 • committed by Linus Groh
parent e9493a2cd5
commit a701ed52fc
6 changed files with 454 additions and 30 deletions
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3
Userland/Libraries/LibUnicode/Locale.h
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@ -195,4 +195,7 @@ Optional<LanguageID> add_likely_subtags(LanguageID const& language_id);
Optional<LanguageID> remove_likely_subtags(LanguageID const& language_id);
String resolve_most_likely_territory(LanguageID const& language_id, StringView territory_alias);
Optional<NumberFormat> select_currency_unit_pattern(StringView locale, StringView system, double number);
String create_currency_format_pattern(StringView currency_display, StringView base_pattern);
}