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LibJS: Return Optional<T> from Completion::{value,target}(), not T

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In the end this is a nicer API than having separate has_{value,target}()
and having to check those first, and then making another Optional from
the unwrapped value:

    completion.has_value() ? completion.value() : Optional<Value> {}
    //                       ^^^^^^^^^^^^^^^^^^
    //         Implicit creation of non-empty Optional<Value>

This way we need to unwrap the optional ourselves, but can easily pass
it to something else as well.

This is in anticipation of the AST using completions :^)
This commit is contained in:
Linus Groh 2021-12-28 17:42:14 +01:00
parent b39aede8fe
commit 85f0fc2b83
15 changed files with 55 additions and 57 deletions
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34
Userland/Libraries/LibJS/Runtime/PromiseReaction.h
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@ -20,23 +20,23 @@ struct PromiseCapability {
};
// 27.2.1.1.1 IfAbruptRejectPromise ( value, capability ), https://tc39.es/ecma262/#sec-ifabruptrejectpromise
#define TRY_OR_REJECT(vm, capability, expression) \
({ \
auto _temporary_try_or_reject_result = (expression); \
/* 1. If value is an abrupt completion, then */ \
if (_temporary_try_or_reject_result.is_error()) { \
vm.clear_exception(); \
vm.stop_unwind(); \
\
/* a. Perform ? Call(capability.[[Reject]], undefined, « value.[[Value]] »). */ \
TRY(vm.call(*capability.reject, js_undefined(), _temporary_try_or_reject_result.release_error().value())); \
\
/* b. Return capability.[[Promise]]. */ \
return capability.promise; \
} \
\
/* 2. Else if value is a Completion Record, set value to value.[[Value]]. */ \
_temporary_try_or_reject_result.release_value(); \
#define TRY_OR_REJECT(vm, capability, expression) \
({ \
auto _temporary_try_or_reject_result = (expression); \
/* 1. If value is an abrupt completion, then */ \
if (_temporary_try_or_reject_result.is_error()) { \
vm.clear_exception(); \
vm.stop_unwind(); \
\
/* a. Perform ? Call(capability.[[Reject]], undefined, « value.[[Value]] »). */ \
TRY(vm.call(*capability.reject, js_undefined(), *_temporary_try_or_reject_result.release_error().value())); \
\
/* b. Return capability.[[Promise]]. */ \
return capability.promise; \
} \
\
/* 2. Else if value is a Completion Record, set value to value.[[Value]]. */ \
_temporary_try_or_reject_result.release_value(); \
})
// 27.2.1.5 NewPromiseCapability ( C ), https://tc39.es/ecma262/#sec-newpromisecapability