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fa005bd276
The zone1970.tab file in the TZDB contains regional time zone data, some of which we already parse for the system time zone settings map. This parses the region names from that file and generates a list of time zones which are used in each of those regions.
76 lines
2 KiB
C++
76 lines
2 KiB
C++
/*
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* Copyright (c) 2022, Tim Flynn <trflynn89@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Array.h>
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#include <AK/Error.h>
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#include <AK/Optional.h>
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#include <AK/String.h>
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#include <AK/StringView.h>
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#include <AK/Time.h>
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#include <AK/Types.h>
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#include <AK/Vector.h>
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#include <LibTimeZone/Forward.h>
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namespace TimeZone {
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enum class InDST {
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No,
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Yes,
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};
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struct Offset {
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i64 seconds { 0 };
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InDST in_dst { InDST::No };
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};
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struct NamedOffset : public Offset {
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String name;
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};
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struct Coordinate {
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constexpr float decimal_coordinate() const
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{
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return static_cast<float>(degrees) + (static_cast<float>(minutes) / 60.0f) + (static_cast<float>(seconds) / 3'600.0f);
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}
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i16 degrees { 0 };
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u8 minutes { 0 };
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u8 seconds { 0 };
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};
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struct Location {
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Coordinate latitude;
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Coordinate longitude;
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};
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StringView system_time_zone();
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StringView current_time_zone();
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ErrorOr<void> change_time_zone(StringView time_zone);
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Span<StringView const> all_time_zones();
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Optional<TimeZone> time_zone_from_string(StringView time_zone);
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StringView time_zone_to_string(TimeZone time_zone);
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Optional<StringView> canonicalize_time_zone(StringView time_zone);
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Optional<DaylightSavingsRule> daylight_savings_rule_from_string(StringView daylight_savings_rule);
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StringView daylight_savings_rule_to_string(DaylightSavingsRule daylight_savings_rule);
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Optional<Offset> get_time_zone_offset(TimeZone time_zone, AK::Time time);
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Optional<Offset> get_time_zone_offset(StringView time_zone, AK::Time time);
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Optional<Array<NamedOffset, 2>> get_named_time_zone_offsets(TimeZone time_zone, AK::Time time);
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Optional<Array<NamedOffset, 2>> get_named_time_zone_offsets(StringView time_zone, AK::Time time);
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Optional<Location> get_time_zone_location(TimeZone time_zone);
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Optional<Location> get_time_zone_location(StringView time_zone);
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Optional<Region> region_from_string(StringView region);
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StringView region_to_string(Region region);
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Vector<StringView> time_zones_in_region(StringView region);
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}
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