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Unified 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, 6 months ago
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Index: Source/bindings/core/v8/ScriptPromisePropertyBase.cpp
diff --git a/Source/bindings/core/v8/ScriptPromisePropertyBase.cpp b/Source/bindings/core/v8/ScriptPromisePropertyBase.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..cd2d27527e0cbdba55a7810546234afffb9d3ae1
--- /dev/null
+++ b/Source/bindings/core/v8/ScriptPromisePropertyBase.cpp
@@ -0,0 +1,155 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+#include "bindings/core/v8/ScriptPromisePropertyBase.h"
+
+#include "bindings/core/v8/V8Binding.h"
+#include "bindings/core/v8/V8HiddenValue.h"
+#include "core/dom/ExecutionContext.h"
+
+namespace WebCore {
+
+ScriptPromisePropertyBase::ScriptPromisePropertyBase(ExecutionContext* executionContext, Name name)
+ : ContextLifecycleObserver(executionContext)
+ , m_isolate(toIsolate(executionContext))
+ , m_name(name)
+ , m_state(Pending)
+{
+}
+
+ScriptPromisePropertyBase::~ScriptPromisePropertyBase()
+{
+ v8::HandleScope handleScope(m_isolate);
+ v8::Handle<v8::Object> wrapper = m_mainWorldWrapper.newLocal(m_isolate);
+ if (!wrapper.IsEmpty()) {
+ wrapper->DeleteHiddenValue(resolverName());
+ wrapper->DeleteHiddenValue(promiseName());
+ }
+}
+
+static void clearHandle(const v8::WeakCallbackData<v8::Object, ScopedPersistent<v8::Object> >& data)
+{
+ data.GetParameter()->clear();
+}
+
+ScriptPromise ScriptPromisePropertyBase::promise(DOMWrapperWorld& world)
+{
+ if (!executionContext())
+ return ScriptPromise();
+
+ if (!world.isMainWorld()) {
+ // FIXME: Support isolated worlds.
+ return ScriptPromise();
+ }
+
+ v8::HandleScope handleScope(m_isolate);
+ v8::Handle<v8::Context> context = toV8Context(executionContext(), world);
+ if (context.IsEmpty())
+ return ScriptPromise();
+ ScriptState* scriptState = ScriptState::from(context);
+ ScriptState::Scope scope(scriptState);
+
+ v8::Handle<v8::Object> wrapper = m_mainWorldWrapper.newLocal(m_isolate);
+ if (wrapper.IsEmpty()) {
+ wrapper = holder(context->Global(), m_isolate);
+ ASSERT(!wrapper.IsEmpty());
+ ASSERT(V8HiddenValue::getHiddenValue(m_isolate, wrapper, resolverName()).IsEmpty());
+ ASSERT(V8HiddenValue::getHiddenValue(m_isolate, wrapper, promiseName()).IsEmpty());
+ m_mainWorldWrapper.set(m_isolate, wrapper);
+ m_mainWorldWrapper.setWeak(&m_mainWorldWrapper, &clearHandle);
+ }
+ ASSERT(wrapper->CreationContext() == context);
+
+ v8::Handle<v8::Promise> promise = V8HiddenValue::getHiddenValue(m_isolate, wrapper, promiseName()).As<v8::Promise>();
+ if (!promise.IsEmpty()) {
+ // Return cached Promise
+ return ScriptPromise(scriptState, promise);
+ }
+
+ // Create and cache the Promise
+ v8::Handle<v8::Promise::Resolver> resolver = v8::Promise::Resolver::New(m_isolate);
+ promise = resolver->GetPromise();
+ V8HiddenValue::setHiddenValue(m_isolate, wrapper, promiseName(), promise);
+
+ switch (m_state) {
+ case Pending:
+ // Cache the resolver too
+ V8HiddenValue::setHiddenValue(m_isolate, wrapper, resolverName(), resolver);
+ break;
+ case Resolved:
+ case Rejected:
+ resolveOrRejectInternal(resolver);
+ break;
+ }
+
+ return ScriptPromise(scriptState, promise);
+}
+
+void ScriptPromisePropertyBase::resolveOrReject(State targetState)
+{
+ ASSERT(executionContext());
+ ASSERT(m_state == Pending);
+ ASSERT(targetState == Resolved || targetState == Rejected);
+
+ m_state = targetState;
+
+ v8::HandleScope handleScope(m_isolate);
+ v8::Handle<v8::Object> wrapper = m_mainWorldWrapper.newLocal(m_isolate);
+ if (wrapper.IsEmpty())
+ return; // wrapper has died or was never populated
+ ScriptState::Scope scope(ScriptState::from(wrapper->CreationContext()));
+
+ v8::Handle<v8::Promise::Resolver> resolver = V8HiddenValue::getHiddenValue(m_isolate, wrapper, resolverName()).As<v8::Promise::Resolver>();
+
+ V8HiddenValue::deleteHiddenValue(m_isolate, wrapper, resolverName());
+ resolveOrRejectInternal(resolver);
+}
+
+void ScriptPromisePropertyBase::resolveOrRejectInternal(v8::Handle<v8::Promise::Resolver> resolver)
+{
+ switch (m_state) {
+ case Pending:
+ ASSERT_NOT_REACHED();
+ break;
+ case Resolved:
+ resolver->Resolve(resolvedValue(resolver->CreationContext()->Global(), m_isolate));
+ break;
+ case Rejected:
+ resolver->Reject(rejectedValue(resolver->CreationContext()->Global(), m_isolate));
+ break;
+ }
+}
+
+v8::Handle<v8::String> ScriptPromisePropertyBase::promiseName()
+{
+ switch (m_name) {
+#define P(Name) \
+ case Name: \
+ return V8HiddenValue::Name ## Promise(m_isolate);
+
+ SCRIPT_PROMISE_PROPERTIES(P)
+
+#undef P
+ }
+ ASSERT_NOT_REACHED();
+ return v8::Handle<v8::String>();
+}
+
+v8::Handle<v8::String> ScriptPromisePropertyBase::resolverName()
+{
+ switch (m_name) {
+#define P(Name) \
+ case Name: \
+ return V8HiddenValue::Name ## Resolver(m_isolate);
+
+ SCRIPT_PROMISE_PROPERTIES(P)
+
+#undef P
+ }
+ ASSERT_NOT_REACHED();
+ return v8::Handle<v8::String>();
+}
+
+} // namespace WebCore
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