350fdf1e43
LibCore currently cannot depend on LibTimeZone directly. All build-time code generators depend on LibCore, so there'd be a circular dependency: LibCore -> LibTimeZone -> GenerateTZData -> LibCore. So to support parsing time zone names and applying their offsets, add a couple of weakly-defined helper functions. These work similar to the way AK::String declares some methods that LibUnicode defines. Any user who wants to parse time zone names (from outside of LibCore itself) can link against LibTimeZone to receive full support.
38 lines
1,001 B
C++
38 lines
1,001 B
C++
/*
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* Copyright (c) 2023, 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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#include <AK/GenericLexer.h>
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#include <LibTimeZone/DateTime.h>
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#include <LibTimeZone/TimeZone.h>
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namespace Core {
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Optional<StringView> parse_time_zone_name(GenericLexer& lexer)
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{
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auto start_position = lexer.tell();
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Optional<StringView> canonicalized_time_zone;
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lexer.ignore_until([&](auto) {
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auto time_zone = lexer.input().substring_view(start_position, lexer.tell() - start_position + 1);
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canonicalized_time_zone = TimeZone::canonicalize_time_zone(time_zone);
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return canonicalized_time_zone.has_value();
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});
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if (canonicalized_time_zone.has_value())
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lexer.ignore();
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return canonicalized_time_zone;
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}
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void apply_time_zone_offset(StringView time_zone, UnixDateTime& time)
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{
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if (auto offset = TimeZone::get_time_zone_offset(time_zone, time); offset.has_value())
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time -= Duration::from_seconds(offset->seconds);
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}
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}
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