[ABANDONED] Implement Promises.

Source/bindings/v8/V8PromiseUtilities.cpp

+/*
+ * Copyright (C) 2013 Google Inc.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "bindings/v8/V8PromiseUtilities.h"
+
+#include "PromiseCustomScript.h"
+#include "PromiseResolverCustomScript.h"
+#include "V8PromiseResolver.h"
+#include "bindings/v8/ScriptFunctionCall.h"
+#include "bindings/v8/ScriptValue.h"
+#include "bindings/v8/V8Binding.h"
+#include "bindings/v8/V8HiddenPropertyName.h"
+#include "bindings/v8/V8ScriptRunner.h"
+#include "bindings/v8/V8ThrowException.h"
+#include "core/dom/Document.h"
+#include "core/dom/ExceptionCode.h"
+#include "core/page/DOMWindow.h"
+#include "core/platform/Task.h"
+#include "wtf/Functional.h"
+#include "wtf/PassOwnPtr.h"
+
+#include <v8.h>
+
+namespace WebCore {
+namespace {
+class PromiseCallbackTask : public ScriptExecutionContext::Task {
+public:
+    PromiseCallbackTask(v8::Handle<v8::Function> callback): m_callback(callback) { }
+    virtual ~PromiseCallbackTask() { }
+
+    virtual void performTask(ScriptExecutionContext*) OVERRIDE;
+
+private:
+    ScriptValue m_callback;
+};
+
+void PromiseCallbackTask::performTask(ScriptExecutionContext* context)
+{
+    ASSERT(context->isDocument());
+    ScriptState* state = mainWorldScriptState(static_cast<Document*>(context)->frame());
+    v8::HandleScope handleScope;
+    if (!state) {
+        // We can't execute the task. Ignore it.
+        return;
+    }
+    v8::Handle<v8::Context> v8context = state->context();
+    if (v8context.IsEmpty()) {
+        // We can't execute the task. Ignore it.
+        return;
+    }
+    v8::Context::Scope scope(v8context);
+    ScriptCallback(state, m_callback).call();
+};
+
+v8::Handle<v8::Value> postTask(const v8::Arguments& args)
+{
+    DOMWindow* window = activeDOMWindow();
+    if (args.Length() != 1 || args[0].IsEmpty() || !args[0]->IsFunction())
+        return V8ThrowException::throwError(v8TypeError, "postTask takes exact one function argument.", args.GetIsolate());
+    v8::Handle<v8::Function> callback = args[0].As<v8::Function>();
+    if (!window)
+        return V8ThrowException::setDOMException(INVALID_STATE_ERR, args.GetIsolate());
+    Document* document = window->document();
+    if (!document)
+        return V8ThrowException::setDOMException(INVALID_STATE_ERR, args.GetIsolate());
+    document->postTask(adoptPtr(new PromiseCallbackTask(callback)));
+    return v8Undefined();
+}
+
+} // unnamed namespace
+
+v8::Handle<v8::Function> V8PromiseUtilities::promiseConstructor(v8::Isolate* isolate)
+{
+    const char name[] = "Promise";
+    v8::Local<v8::Object> global = isolate->GetCurrentContext()->Global();
+    v8::Local<v8::Value> placeholderValue = global->Get(v8::String::NewSymbol(name));
+    if (placeholderValue.IsEmpty() || !placeholderValue->IsObject())
+        return V8ThrowException::throwError(v8GeneralError, "The placeholder for Promise is not found.", isolate).As<v8::Function>();
+    v8::Local<v8::Object> placeholder = placeholderValue.As<v8::Object>();
+    v8::Handle<v8::Value> value = placeholder->GetHiddenValue(V8HiddenPropertyName::jsConstructor());
+    if (!value.IsEmpty() && value->IsFunction()) {
+        // Return the stored constructor.
+        return value.As<v8::Function>();
+    }
+
+    value = V8ScriptRunner::compileAndRunInternalScript(v8String(String(Promise_js, sizeof(Promise_js)), isolate), isolate);
+    if (value.IsEmpty())
+        return v8::Handle<v8::Function>();
+    if (!value->IsFunction())
+        return V8ThrowException::throwError(v8TypeError, "Promise implementation must be a function.", isolate).As<v8::Function>();
+
+    v8::Handle<v8::Function> impl = value.As<v8::Function>();
+    v8::Handle<v8::Value> args[] = {
+        v8::FunctionTemplate::New(postTask)->GetFunction(),
+    };
+    value = impl->Call(v8::Object::New(), sizeof(args) / sizeof(args[0]), &args[0]);
+    if (value.IsEmpty())
+        return v8::Handle<v8::Function>();
+    if (!value->IsFunction())
+        return V8ThrowException::throwError(v8TypeError, "Promise constructor must be a function.", isolate).As<v8::Function>();
+    placeholder->SetHiddenValue(V8HiddenPropertyName::jsConstructor(), value);
+    return value.As<v8::Function>();
+}
+
+v8::Handle<v8::Value> V8PromiseUtilities::promisePrototype(v8::Isolate* isolate)
+{
+    v8::Handle<v8::Object> constructor = promiseConstructor(isolate);
+    if (constructor.IsEmpty())
+        return constructor;
+    return constructor->Get(v8::String::NewSymbol("prototype"));
+}
+
+v8::Handle<v8::Function> V8PromiseUtilities::promiseResolverConstructor(v8::Isolate* isolate)
+{
+    const char name[] = "PromiseResolver";
+    v8::Local<v8::Object> global = isolate->GetCurrentContext()->Global();
+    v8::Local<v8::Value> placeholderValue = global->Get(v8::String::NewSymbol(name));
+    if (placeholderValue.IsEmpty() || !placeholderValue->IsObject())
+        return V8ThrowException::throwError(v8GeneralError, "The placeholder for Promise is not found.", isolate).As<v8::Function>();
+    v8::Local<v8::Object> placeholder = placeholderValue.As<v8::Object>();
+    v8::Handle<v8::Value> value = placeholder->GetHiddenValue(V8HiddenPropertyName::jsConstructor());
+    if (!value.IsEmpty() && value->IsFunction()) {
+        // Return the stored constructor.
+        return value.As<v8::Function>();
+    }
+    value = V8ScriptRunner::compileAndRunInternalScript(v8String(String(PromiseResolver_js, sizeof(PromiseResolver_js)), isolate), isolate);
+    if (value.IsEmpty())
+        return v8::Handle<v8::Function>();
+    if (!value->IsFunction())
+        return V8ThrowException::throwError(v8TypeError, "PromiseResolver implementation must be a function.", isolate).As<v8::Function>();
+
+    v8::Handle<v8::Function> impl = value.As<v8::Function>();
+    v8::Handle<v8::Value> postTaskWrapper = v8::FunctionTemplate::New(postTask)->GetFunction();
+    value = impl->Call(v8::Object::New(), 1, &postTaskWrapper);
+    if (value.IsEmpty())
+        return v8::Handle<v8::Function>();
+    if (!value->IsFunction())
+        return V8ThrowException::throwError(v8TypeError, "Promise constructor must be a function.", isolate).As<v8::Function>();
+    placeholder->SetHiddenValue(V8HiddenPropertyName::jsConstructor(), value);
+    return value.As<v8::Function>();
+}
+
+v8::Handle<v8::Value> V8PromiseUtilities::promiseResolverPrototype(v8::Isolate* isolate)
+{
+    v8::Handle<v8::Object> constructor = promiseResolverConstructor(isolate);
+    if (constructor.IsEmpty())
+        return constructor;
+    return constructor->Get(v8::String::NewSymbol("prototype"));
+}
+
+v8::Handle<v8::Value> V8PromiseUtilities::callUnwrappedMethod(const char* name, const v8::FunctionCallbackInfo<v8::Value>& args, v8::Handle<v8::Value> prototype)
+{
+    Vector<v8::Handle<v8::Value> > arguments;
+    for (int i = 0; i < args.Length(); ++i)
+        arguments.append(args[i]);
+    return callUnwrappedMethod(name, args.This(), arguments.size(), arguments.data(), args.GetIsolate(), prototype);
+}
+
+v8::Handle<v8::Value> V8PromiseUtilities::callUnwrappedMethod(const char* name, v8::Handle<v8::Object> thisObject,
+    int argc, v8::Handle<v8::Value> argv[], v8::Isolate* isolate, v8::Handle<v8::Value> prototype)
+{
+    v8::Handle<v8::Value> that = thisObject->GetInternalField(v8DOMWrapperObjectIndex);
+    if (that.IsEmpty() || !that->IsObject())
+        return V8ThrowException::throwError(v8TypeError, "This object is not an object.", isolate);
+
+    if (prototype.IsEmpty() || !prototype->IsObject())
+        return V8ThrowException::throwError(v8TypeError, "The prototypex is not an object.", isolate);
+
+    v8::Local<v8::Value> property = prototype.As<v8::Object>()->Get(v8::String::NewSymbol(name));
+    if (property.IsEmpty() || !property->IsFunction())
+        return V8ThrowException::throwError(v8TypeError, (std::string("The property ") + name + " is not a function.").c_str(), isolate);
+    return property.As<v8::Function>()->Call(that.As<v8::Object>(), argc, argv);
+}
+
+v8::Handle<v8::Value> V8PromiseUtilities::callStatic(const char* name, const v8::FunctionCallbackInfo<v8::Value>& args, v8::Handle<v8::Value> constructor)
+{
+    if (constructor.IsEmpty() || !constructor->IsObject())
+        return V8ThrowException::throwError(v8TypeError, "The constructor object is not found.", args.GetIsolate());
+    v8::Local<v8::Value> property = constructor.As<v8::Object>()->Get(v8::String::NewSymbol(name));
+    if (property.IsEmpty() || !property->IsFunction())
+        return V8ThrowException::throwError(v8TypeError, (std::string("The property ") + name + " is not a function.").c_str(), args.GetIsolate());
+    Vector<v8::Handle<v8::Value> > arguments;
+    for (int i = 0; i < args.Length(); ++i)
+        arguments.append(args[i]);
+    return property.As<v8::Function>()->Call(args.This(), arguments.size(), arguments.data());
+}
+
+} // namespace WebCore