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265e89367e
Here we got our first Temporal object :^) This patch adds the TimeZone object itself, its constructor and prototype (currently empty), and a bunch of required abstract operations
95 lines
3.5 KiB
C++
95 lines
3.5 KiB
C++
/*
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* Copyright (c) 2021, Linus Groh <linusg@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 <LibJS/Runtime/AbstractOperations.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/Temporal/ISO8601.h>
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#include <LibJS/Runtime/Temporal/TimeZone.h>
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#include <LibJS/Runtime/Temporal/TimeZoneConstructor.h>
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namespace JS::Temporal {
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// 11 Temporal.TimeZone Objects, https://tc39.es/proposal-temporal/#sec-temporal-timezone-objects
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TimeZone::TimeZone(String identifier, Object& prototype)
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: Object(prototype)
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, m_identifier(move(identifier))
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{
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}
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// 11.1.1 IsValidTimeZoneName ( timeZone ), https://tc39.es/proposal-temporal/#sec-isvalidtimezonename
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// NOTE: This is the minimum implementation of IsValidTimeZoneName, supporting only the "UTC" time zone.
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bool is_valid_time_zone_name(String const& time_zone)
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{
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// 1. Assert: Type(timeZone) is String.
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// 2. Let tzText be ! StringToCodePoints(timeZone).
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// 3. Let tzUpperText be the result of toUppercase(tzText), according to the Unicode Default Case Conversion algorithm.
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// 4. Let tzUpper be ! CodePointsToString(tzUpperText).
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auto tz_upper = time_zone.to_uppercase();
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// 5. If tzUpper and "UTC" are the same sequence of code points, return true.
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if (tz_upper == "UTC")
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return true;
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// 6. Return false.
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return false;
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}
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// 11.1.2 CanonicalizeTimeZoneName ( timeZone ), https://tc39.es/proposal-temporal/#sec-canonicalizetimezonename
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// NOTE: This is the minimum implementation of CanonicalizeTimeZoneName, supporting only the "UTC" time zone.
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String canonicalize_time_zone_name(String const& time_zone)
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{
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// 1. Assert: Type(timeZone) is String.
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// 2. Assert: ! IsValidTimeZoneName(timeZone) is true.
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VERIFY(is_valid_time_zone_name(time_zone));
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// 3. Return "UTC".
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return "UTC";
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}
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// 11.1.3 DefaultTimeZone ( ), https://tc39.es/proposal-temporal/#sec-defaulttimezone
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// NOTE: This is the minimum implementation of DefaultTimeZone, supporting only the "UTC" time zone.
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String default_time_zone()
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{
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// 1. Return "UTC".
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return "UTC";
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}
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// 11.6.2 CreateTemporalTimeZone ( identifier [ , newTarget ] ), https://tc39.es/proposal-temporal/#sec-temporal-createtemporaltimezone
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Object* create_temporal_time_zone(GlobalObject& global_object, String const& identifier, FunctionObject* new_target)
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{
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auto& vm = global_object.vm();
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// 1. If newTarget is not present, set it to %Temporal.TimeZone%.
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if (!new_target)
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new_target = global_object.temporal_time_zone_constructor();
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// 2. Let object be ? OrdinaryCreateFromConstructor(newTarget, "%Temporal.TimeZone.prototype%", « [[InitializedTemporalTimeZone]], [[Identifier]], [[OffsetNanoseconds]] »).
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// 3. Set object.[[Identifier]] to identifier.
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auto* object = ordinary_create_from_constructor<TimeZone>(global_object, *new_target, &GlobalObject::temporal_time_zone_prototype, identifier);
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if (vm.exception())
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return {};
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// 4. If identifier satisfies the syntax of a TimeZoneNumericUTCOffset (see 13.33), then
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if (is_valid_time_zone_numeric_utc_offset(identifier)) {
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// TODO:
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// a. Set object.[[OffsetNanoseconds]] to ! ParseTimeZoneOffsetString(identifier).
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}
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// 5. Else,
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else {
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// a. Assert: ! CanonicalizeTimeZoneName(identifier) is identifier.
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VERIFY(canonicalize_time_zone_name(identifier) == identifier);
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// b. Set object.[[OffsetNanoseconds]] to undefined.
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// NOTE: No-op.
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}
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// 6. Return object.
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return object;
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}
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}
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