[ABANDONED] Introduce Promise example implementation written in JavaScript.

Source/bindings/v8/V8PromiseUtilities.cpp

Index: Source/bindings/v8/V8PromiseUtilities.cpp
diff --git a/Source/bindings/v8/V8PromiseUtilities.cpp b/Source/bindings/v8/V8PromiseUtilities.cpp
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+/*
+ * 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 "bindings/v8/V8Binding.h"
+#include "bindings/v8/V8HiddenPropertyName.h"
+#include "bindings/v8/V8ScriptRunner.h"
+#include "bindings/v8/V8ThrowException.h"
+#include "wtf/text/CString.h"
+#include "wtf/text/WTFString.h"
+
+#include <v8.h>
+
+namespace WebCore {
+
+v8::Handle<v8::Function> V8PromiseUtilities::promiseConstructor(v8::Isolate* isolate)
+{
+    const char name[] = "Promise";
+    v8::Local<v8::Object> global = isolate->GetCurrentContext()->Global();

[abarth-chromium, 2013/06/17 18:05:06]

Perhaps we should pass in the context instead of assuming we always want the
current context?

[yhirano, 2013/06/18 08:56:15]

Done (in ScriptRunner::blinkJSConstructor).

+    v8::Local<v8::Value> placeholderValue = global->Get(v8::String::NewSymbol(name));

[abarth-chromium, 2013/06/17 18:05:06]

We don't want to read from the global object.  The global object might have been
manipulated by the web site.  Instead, we want to store this information in
V8PerContextData.

[yhirano, 2013/06/18 08:56:15]

Done (in ScriptRunner::blinkJSConstructor).

+    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);

[abarth-chromium, 2013/06/17 18:05:06]

Most of the code from here down should be abstracted into a function in
V8ScriptRunner for calling blinkjs scripts.  It's likely we'll want to pass in a
number of arguments so that the script has functions it can call that haven't
been manipulated by the page.

[yhirano, 2013/06/18 08:56:15]

Done.

+    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[] = {
+    };
+    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>();
+    bool result = placeholder->SetHiddenValue(V8HiddenPropertyName::jsConstructor(), value);
+    if (!result)
+        return V8ThrowException::throwError(v8TypeError, "Cannot save the promise constructor", isolate).As<v8::Function>();
+    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"));

[abarth-chromium, 2013/06/17 18:05:06]

This isn't right.  The prototype property might have been manipulated by the
page.  Instead, we need to store the prototype property in V8PerContextData.

[yhirano, 2013/06/18 08:56:15]

But Web developers cannot access the object. They access a wrapper object. So
there is no problem, I think.

+}
+
+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)
+{
+    if (thisObject.IsEmpty()) {
+        String message = String("Cannot call method '") + name + "' of undefined";
+        return V8ThrowException::throwError(v8TypeError, message.utf8().data(), isolate);
+    }
+    v8::Handle<v8::Value> unwrapped = thisObject->GetInternalField(v8DOMWrapperObjectIndex);
+    if (unwrapped.IsEmpty() || !unwrapped->IsObject())
+        return V8ThrowException::throwError(v8TypeError, "The wrapped this value is not an object", isolate);
+
+    if (prototype.IsEmpty() || !prototype->IsObject())
+        return V8ThrowException::throwError(v8TypeError, "The prototype is not an object", isolate);
+
+    v8::Local<v8::Value> property = prototype.As<v8::Object>()->Get(v8::String::NewSymbol(name));
+    if (property.IsEmpty() || !property->IsFunction()) {
+        String message = String("Property '") + name + "' of the object is not a function";
+        return V8ThrowException::throwError(v8TypeError, message.utf8().data(), isolate);
+    }
+    return property.As<v8::Function>()->Call(unwrapped.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()) {
+        String message = String("Property '") + name + "' of the object is not a function";
+        return V8ThrowException::throwError(v8TypeError, message.utf8().data(), 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