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Side by Side Diff: Source/bindings/core/v8/ScriptPromisePropertyBase.cpp

Issue 361863003: Add a helper for implementing Promise-valued properties. (Closed) Base URL: svn://svn.chromium.org/blink/trunk
Patch Set: More feedback. Keeping separate header file for now. Created 6 years, 5 months ago
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1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "config.h"
6 #include "bindings/core/v8/ScriptPromisePropertyBase.h"
7
8 #include "bindings/core/v8/V8Binding.h"
9 #include "bindings/core/v8/V8HiddenValue.h"
10 #include "core/dom/ExecutionContext.h"
11
12 namespace WebCore {
13
14 ScriptPromisePropertyBase::ScriptPromisePropertyBase(ExecutionContext* execution Context, Name name)
15 : ContextLifecycleObserver(executionContext)
16 , m_isolate(toIsolate(executionContext))
17 , m_name(name)
18 , m_state(Pending)
19 {
20 }
21
22 ScriptPromisePropertyBase::~ScriptPromisePropertyBase()
23 {
24 v8::HandleScope handleScope(m_isolate);
25 v8::Handle<v8::Object> wrapper = m_mainWorldWrapper.newLocal(m_isolate);
26 if (!wrapper.IsEmpty()) {
27 wrapper->DeleteHiddenValue(resolverName());
28 wrapper->DeleteHiddenValue(promiseName());
29 }
30 }
31
32 static void clearHandle(const v8::WeakCallbackData<v8::Object, ScopedPersistent< v8::Object> >& data)
33 {
34 data.GetParameter()->clear();
35 }
36
37 ScriptPromise ScriptPromisePropertyBase::promise(DOMWrapperWorld& world)
38 {
39 if (!executionContext())
40 return ScriptPromise();
41
42 if (!world.isMainWorld()) {
43 // FIXME: Support isolated worlds.
44 return ScriptPromise();
45 }
46
47 v8::HandleScope handleScope(m_isolate);
48 v8::Handle<v8::Context> context = toV8Context(executionContext(), world);
49 if (context.IsEmpty())
50 return ScriptPromise();
51 ScriptState* scriptState = ScriptState::from(context);
52 ScriptState::Scope scope(scriptState);
53
54 v8::Handle<v8::Object> wrapper = m_mainWorldWrapper.newLocal(m_isolate);
55 if (wrapper.IsEmpty()) {
56 wrapper = holder(context->Global(), m_isolate);
57 ASSERT(!wrapper.IsEmpty());
58 ASSERT(V8HiddenValue::getHiddenValue(m_isolate, wrapper, resolverName()) .IsEmpty());
59 ASSERT(V8HiddenValue::getHiddenValue(m_isolate, wrapper, promiseName()). IsEmpty());
60 m_mainWorldWrapper.set(m_isolate, wrapper);
61 m_mainWorldWrapper.setWeak(&m_mainWorldWrapper, &clearHandle);
62 }
63 ASSERT(wrapper->CreationContext() == context);
64
65 v8::Handle<v8::Promise> promise = V8HiddenValue::getHiddenValue(m_isolate, w rapper, promiseName()).As<v8::Promise>();
66 if (!promise.IsEmpty()) {
67 // Return cached Promise
68 return ScriptPromise(scriptState, promise);
69 }
70
71 // Create and cache the Promise
72 v8::Handle<v8::Promise::Resolver> resolver = v8::Promise::Resolver::New(m_is olate);
73 promise = resolver->GetPromise();
74 V8HiddenValue::setHiddenValue(m_isolate, wrapper, promiseName(), promise);
75
76 switch (m_state) {
77 case Pending:
78 // Cache the resolver too
79 V8HiddenValue::setHiddenValue(m_isolate, wrapper, resolverName(), resolv er);
80 break;
81 case Resolved:
82 case Rejected:
83 resolveOrRejectInternal(resolver);
84 break;
85 }
86
87 return ScriptPromise(scriptState, promise);
88 }
89
90 void ScriptPromisePropertyBase::resolveOrReject(State targetState)
91 {
92 ASSERT(executionContext());
93 ASSERT(m_state == Pending);
94 ASSERT(targetState == Resolved || targetState == Rejected);
95
96 m_state = targetState;
97
98 v8::HandleScope handleScope(m_isolate);
99 v8::Handle<v8::Object> wrapper = m_mainWorldWrapper.newLocal(m_isolate);
100 if (wrapper.IsEmpty())
101 return; // wrapper has died or was never populated
102 ScriptState::Scope scope(ScriptState::from(wrapper->CreationContext()));
103
104 v8::Handle<v8::Promise::Resolver> resolver = V8HiddenValue::getHiddenValue(m _isolate, wrapper, resolverName()).As<v8::Promise::Resolver>();
105
106 V8HiddenValue::deleteHiddenValue(m_isolate, wrapper, resolverName());
107 resolveOrRejectInternal(resolver);
108 }
109
110 void ScriptPromisePropertyBase::resolveOrRejectInternal(v8::Handle<v8::Promise:: Resolver> resolver)
111 {
112 switch (m_state) {
113 case Pending:
114 ASSERT_NOT_REACHED();
115 break;
116 case Resolved:
117 resolver->Resolve(resolvedValue(resolver->CreationContext()->Global(), m _isolate));
118 break;
119 case Rejected:
120 resolver->Reject(rejectedValue(resolver->CreationContext()->Global(), m_ isolate));
121 break;
122 }
123 }
124
125 v8::Handle<v8::String> ScriptPromisePropertyBase::promiseName()
126 {
127 switch (m_name) {
128 #define P(Name) \
129 case Name: \
130 return V8HiddenValue::Name ## Promise(m_isolate);
131
132 SCRIPT_PROMISE_PROPERTIES(P)
133
134 #undef P
135 }
136 ASSERT_NOT_REACHED();
137 return v8::Handle<v8::String>();
138 }
139
140 v8::Handle<v8::String> ScriptPromisePropertyBase::resolverName()
141 {
142 switch (m_name) {
143 #define P(Name) \
144 case Name: \
145 return V8HiddenValue::Name ## Resolver(m_isolate);
146
147 SCRIPT_PROMISE_PROPERTIES(P)
148
149 #undef P
150 }
151 ASSERT_NOT_REACHED();
152 return v8::Handle<v8::String>();
153 }
154
155 } // namespace WebCore
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