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LibUnicode: Add minimal support for generic & offset-based time zones

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ECMA-402 now supports short-offset, long-offset, short-generic, and
long-generic time zone name formatting. For example, in the en-US locale
the America/Eastern time zone would be formatted as:

    short-offset: GMT-5
    long-offset: GMT-05:00
    short-generic: ET
    long-generic: Eastern Time

We currently only support the UTC time zone, however. Therefore, this
very minimal implementation does not consider GMT offset or generic
display names. Instead, the CLDR defines specific strings for UTC.
This commit is contained in:
Timothy Flynn 2022-01-02 14:23:24 -05:00 • committed by Linus Groh
parent d2ac40bcd7
commit 126a3fe180
3 changed files with 109 additions and 19 deletions
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18
Userland/Libraries/LibUnicode/DateTimeFormat.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2021, Tim Flynn <trflynn89@pm.me>
* Copyright (c) 2021-2022, Tim Flynn <trflynn89@pm.me>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -53,6 +53,14 @@ CalendarPatternStyle calendar_pattern_style_from_string(StringView style)
return CalendarPatternStyle::Numeric;
if (style == "2-digit"sv)
return CalendarPatternStyle::TwoDigit;
if (style == "shortOffset"sv)
return CalendarPatternStyle::ShortOffset;
if (style == "longOffset"sv)
return CalendarPatternStyle::LongOffset;
if (style == "shortGeneric"sv)
return CalendarPatternStyle::ShortGeneric;
if (style == "longGeneric"sv)
return CalendarPatternStyle::LongGeneric;
VERIFY_NOT_REACHED();
}
@ -69,6 +77,14 @@ StringView calendar_pattern_style_to_string(CalendarPatternStyle style)
return "numeric"sv;
case CalendarPatternStyle::TwoDigit:
return "2-digit"sv;
case CalendarPatternStyle::ShortOffset:
return "shortOffset"sv;
case CalendarPatternStyle::LongOffset:
return "longOffset"sv;
case CalendarPatternStyle::ShortGeneric:
return "shortGeneric"sv;
case CalendarPatternStyle::LongGeneric:
return "longGeneric"sv;
default:
VERIFY_NOT_REACHED();
}