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LibTimeZone: Add an API to retrieve both daylight and standard offsets

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This API will also include the formatted name of the time zone, with
respect for DST (e.g. EST vs EDT for America/New_York).
This commit is contained in:
Timothy Flynn 2022-01-24 12:36:17 -05:00 • committed by Linus Groh
parent fc0c88344b
commit 7103012c7d
4 changed files with 87 additions and 1 deletions
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32
Meta/Lagom/Tools/CodeGenerators/LibTimeZone/GenerateTimeZoneData.cpp
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@ -582,6 +582,38 @@ Optional<Offset> get_time_zone_offset(TimeZone time_zone, AK::Time time)
return dst_offset;
}
Optional<Array<NamedOffset, 2>> get_named_time_zone_offsets(TimeZone time_zone, AK::Time time)
{
auto const& time_zone_offset = find_time_zone_offset(time_zone, time);
Array<NamedOffset, 2> named_offsets;
auto format_name = [](auto format, auto offset) -> String {
if (offset == 0)
return s_string_list[format].replace("{}"sv, ""sv);
return String::formatted(s_string_list[format], s_string_list[offset]);
};
auto set_named_offset = [&](auto& named_offset, auto dst_offset, auto in_dst, auto format, auto offset) {
named_offset.seconds = time_zone_offset.offset + dst_offset;
named_offset.in_dst = in_dst;
named_offset.name = format_name(format, offset);
};
if (time_zone_offset.dst_rule != -1) {
auto offsets = find_dst_offsets(time_zone_offset, time);
auto in_dst = offsets[1]->offset == 0 ? InDST::No : InDST::Yes;
set_named_offset(named_offsets[0], offsets[0]->offset, InDST::No, time_zone_offset.standard_format, offsets[0]->format);
set_named_offset(named_offsets[1], offsets[1]->offset, in_dst, time_zone_offset.daylight_format, offsets[1]->format);
} else {
auto in_dst = time_zone_offset.dst_offset == 0 ? InDST::No : InDST::Yes;
set_named_offset(named_offsets[0], time_zone_offset.dst_offset, in_dst, time_zone_offset.standard_format, 0);
set_named_offset(named_offsets[1], time_zone_offset.dst_offset, in_dst, time_zone_offset.daylight_format, 0);
}
return named_offsets;
}
Span<StringView const> all_time_zones()
{
static constexpr auto all_time_zones = Array {