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https://github.com/RGBCube/serenity
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c2326ec95a
This is not strictly connected to PromiseReaction in any way. Preparation before doing some actual work on it :^)
65 lines
4.7 KiB
C++
65 lines
4.7 KiB
C++
/*
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* Copyright (c) 2021-2022, 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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#pragma once
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#include <AK/Forward.h>
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#include <LibJS/Forward.h>
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#include <LibJS/Runtime/AbstractOperations.h>
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namespace JS {
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// 27.2.1.1 PromiseCapability Records, https://tc39.es/ecma262/#sec-promisecapability-records
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struct PromiseCapability {
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Object* promise { nullptr };
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FunctionObject* resolve { nullptr };
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FunctionObject* reject { nullptr };
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};
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// 27.2.1.1.1 IfAbruptRejectPromise ( value, capability ), https://tc39.es/ecma262/#sec-ifabruptrejectpromise
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#define __TRY_OR_REJECT(vm, capability, expression, CALL_CHECK) \
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({ \
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auto _temporary_try_or_reject_result = (expression); \
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/* 1. If value is an abrupt completion, then */ \
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if (_temporary_try_or_reject_result.is_error()) { \
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/* a. Perform ? Call(capability.[[Reject]], undefined, « value.[[Value]] »). */ \
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CALL_CHECK(JS::call(vm, *capability.reject, js_undefined(), *_temporary_try_or_reject_result.release_error().value())); \
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\
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/* b. Return capability.[[Promise]]. */ \
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return capability.promise; \
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} \
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\
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/* 2. Else if value is a Completion Record, set value to value.[[Value]]. */ \
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_temporary_try_or_reject_result.release_value(); \
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})
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#define TRY_OR_REJECT(vm, capability, expression) \
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__TRY_OR_REJECT(vm, capability, expression, TRY)
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#define TRY_OR_MUST_REJECT(vm, capability, expression) \
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__TRY_OR_REJECT(vm, capability, expression, MUST)
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// 27.2.1.1.1 IfAbruptRejectPromise ( value, capability ), https://tc39.es/ecma262/#sec-ifabruptrejectpromise
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#define TRY_OR_REJECT_WITH_VALUE(vm, capability, expression) \
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({ \
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auto _temporary_try_or_reject_result = (expression); \
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/* 1. If value is an abrupt completion, then */ \
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if (_temporary_try_or_reject_result.is_error()) { \
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/* a. Perform ? Call(capability.[[Reject]], undefined, « value.[[Value]] »). */ \
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TRY(JS::call(vm, *capability.reject, js_undefined(), *_temporary_try_or_reject_result.release_error().value())); \
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\
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/* b. Return capability.[[Promise]]. */ \
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return Value { capability.promise }; \
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} \
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\
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/* 2. Else if value is a Completion Record, set value to value.[[Value]]. */ \
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_temporary_try_or_reject_result.release_value(); \
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})
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// 27.2.1.5 NewPromiseCapability ( C ), https://tc39.es/ecma262/#sec-newpromisecapability
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ThrowCompletionOr<PromiseCapability> new_promise_capability(VM& vm, Value constructor);
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}
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