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32 #include "bindings/v8/ScriptPromise.h"
34 #include "RuntimeEnabledFeatures.h"
35 #include "bindings/v8/V8Binding.h"
36 #include "bindings/v8/V8DOMWrapper.h"
37 #include "bindings/v8/custom/V8PromiseCustom.h"
43 ScriptPromise::ScriptPromise(ScriptState* scriptState, v8::Handle<v8::Value> value)
44 : m_scriptState(scriptState)
49 if (!V8PromiseCustom::isPromise(value, scriptState->isolate()) && !value->IsPromise()) {
50 m_promise = ScriptValue(scriptState, v8::Handle<v8::Value>());
51 V8ThrowException::throwTypeError("the given value is not a Promise", scriptState->isolate());
54 m_promise = ScriptValue(scriptState, value);
57 ScriptPromise ScriptPromise::then(PassOwnPtr<ScriptFunction> onFulfilled, PassOwnPtr<ScriptFunction> onRejected)
59 if (m_promise.isEmpty())
60 return ScriptPromise();
62 v8::Local<v8::Object> promise = m_promise.v8Value().As<v8::Object>();
63 v8::Local<v8::Function> v8OnFulfilled = ScriptFunction::adoptByGarbageCollector(onFulfilled);
64 v8::Local<v8::Function> v8OnRejected = ScriptFunction::adoptByGarbageCollector(onRejected);
66 if (V8PromiseCustom::isPromise(promise, m_scriptState->isolate()))
67 return ScriptPromise(m_scriptState.get(), V8PromiseCustom::then(promise, v8OnFulfilled, v8OnRejected, m_scriptState->isolate()));
69 ASSERT(promise->IsPromise());
70 // Return this Promise if no handlers are given.
71 // In fact it is not the exact bahavior of Promise.prototype.then
72 // but that is not a problem in this case.
73 v8::Local<v8::Promise> resultPromise = promise.As<v8::Promise>();
74 // FIXME: Use Then once it is introduced.
75 if (!v8OnFulfilled.IsEmpty()) {
76 resultPromise = resultPromise->Chain(v8OnFulfilled);
77 if (resultPromise.IsEmpty()) {
78 // v8::Promise::Chain may return an empty value, for example when
79 // the stack is exhausted.
80 return ScriptPromise();
83 if (!v8OnRejected.IsEmpty())
84 resultPromise = resultPromise->Catch(v8OnRejected);
86 return ScriptPromise(m_scriptState.get(), resultPromise);
89 ScriptPromise ScriptPromise::cast(const ScriptValue& value)
92 return ScriptPromise();
93 v8::Local<v8::Value> v8Value(value.v8Value());
94 v8::Isolate* isolate = value.isolate();
95 if (V8PromiseCustom::isPromise(v8Value, isolate) || v8Value->IsPromise()) {
96 return ScriptPromise(value.scriptState(), v8Value);
98 if (RuntimeEnabledFeatures::scriptPromiseOnV8PromiseEnabled()) {
99 v8::Local<v8::Promise::Resolver> resolver = v8::Promise::Resolver::New(isolate);
100 if (resolver.IsEmpty()) {
101 // The Promise constructor may return an empty value, for example
102 // when the stack is exhausted.
103 return ScriptPromise();
105 resolver->Resolve(v8Value);
106 return ScriptPromise(value.scriptState(), resolver->GetPromise());
108 return ScriptPromise(value.scriptState(), V8PromiseCustom::toPromise(v8Value, isolate));
111 } // namespace WebCore