Merge the QJSEngine and QJSValue development branch into master.

This replaces the dependency to QtScript with two new builtin classes
QJSValue and QJSEngine.

This is still work in progress, development continues now in the master branch.

Change-Id: I7f5487feb45c972f25a22b10cc81b9218b9805de
Reviewed-on: http://codereview.qt.nokia.com/2299
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Simon Hausmann <simon.hausmann@nokia.com>

1 files changed, 158 insertions, 0 deletions

diff --git a/src/declarative/qml/v8/qscriptoriginalglobalobject_p.h b/src/declarative/qml/v8/qscriptoriginalglobalobject_p.h
new file mode 100644
index 0000000000..c46d0e37a0
--- /dev/null
+++ b/src/declarative/qml/v8/qscriptoriginalglobalobject_p.h
@@ -0,0 +1,158 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtScript module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL-ONLY$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QSCRIPTORIGINALGLOBALOBJECT_P_H
+#define QSCRIPTORIGINALGLOBALOBJECT_P_H
+
+#include "QtCore/qglobal.h"
+#include "qjsvalue.h"
+
+#include <private/qv8_p.h>
+
+QT_BEGIN_NAMESPACE
+
+class QV8Engine;
+
+/*!
+    \internal
+    This class is a workaround for missing V8 API functionality. This class keeps all important
+    properties of an original (default) global object, so we can use it even if the global object was
+    changed.
+
+    FIXME this class is a container for workarounds :-) it should be replaced by proper API calls.
+
+    The class have to be created on the QV8Engine creation time (before any change got applied to
+    global object).
+
+    \attention All methods (apart from constructor) assumes that a context and a scope are prepared correctly.
+*/
+class QScriptOriginalGlobalObject
+{
+public:
+    inline QScriptOriginalGlobalObject(const QV8Engine *engine, v8::Handle<v8::Context> context);
+    inline void destroy();
+
+    inline QJSValue::PropertyFlags getPropertyFlags(v8::Handle<v8::Object> object, v8::Handle<v8::Value> property);
+    inline v8::Local<v8::Object> getOwnPropertyDescriptor(v8::Handle<v8::Object> object, v8::Handle<v8::Value> property) const;
+    inline bool strictlyEquals(v8::Handle<v8::Object> object);
+private:
+    Q_DISABLE_COPY(QScriptOriginalGlobalObject)
+
+    // Copy of constructors and prototypes used in isType functions.
+    v8::Persistent<v8::Function> m_ownPropertyDescriptor;
+    v8::Persistent<v8::Object> m_globalObject;
+};
+
+QScriptOriginalGlobalObject::QScriptOriginalGlobalObject(const QV8Engine *engine, v8::Handle<v8::Context> context)
+{
+    // Please notice that engine is not fully initialized at this point.
+
+    v8::Context::Scope contextScope(context);
+
+    v8::HandleScope scope;
+
+    m_globalObject = v8::Persistent<v8::Object>::New(context->Global());
+
+    v8::Local<v8::Object> objectConstructor = m_globalObject->Get(v8::String::New("Object"))->ToObject();
+    Q_ASSERT(objectConstructor->IsObject());
+    {   // Initialize m_ownPropertyDescriptor.
+        v8::Local<v8::Value> ownPropertyDescriptor = objectConstructor->Get(v8::String::New("getOwnPropertyDescriptor"));
+        Q_ASSERT(!ownPropertyDescriptor.IsEmpty());
+        m_ownPropertyDescriptor = v8::Persistent<v8::Function>::New(v8::Local<v8::Function>::Cast(ownPropertyDescriptor));
+    }
+}
+
+/*!
+    \internal
+    QScriptOriginalGlobalObject lives as long as QV8Engine that keeps it. In ~QSEP
+    the v8 context is removed, so we need to remove our handlers before. to break this dependency
+    destroy method should be called before or insight QSEP destructor.
+*/
+inline void QScriptOriginalGlobalObject::destroy()
+{
+    m_ownPropertyDescriptor.Dispose();
+    m_globalObject.Dispose();
+    // After this line this instance is unusable.
+}
+
+inline QJSValue::PropertyFlags QScriptOriginalGlobalObject::getPropertyFlags(v8::Handle<v8::Object> object, v8::Handle<v8::Value> property)
+{
+    Q_ASSERT(object->IsObject());
+    Q_ASSERT(!property.IsEmpty());
+    v8::Local<v8::Object> descriptor = getOwnPropertyDescriptor(object, property);
+    if (descriptor.IsEmpty()) {
+//        // Property isn't owned by this object.
+//        if (!(mode & QScriptValue::ResolvePrototype))
+//            return 0;
+        v8::Local<v8::Value> prototype = object->GetPrototype();
+        if (prototype->IsNull())
+            return 0;
+        return getPropertyFlags(v8::Local<v8::Object>::Cast(prototype), property);
+    }
+    v8::Local<v8::String> writableName = v8::String::New("writable");
+    v8::Local<v8::String> configurableName = v8::String::New("configurable");
+    v8::Local<v8::String> enumerableName = v8::String::New("enumerable");
+//    v8::Local<v8::String> getName = v8::String::New("get");
+//    v8::Local<v8::String> setName = v8::String::New("set");
+
+    unsigned flags = 0;
+
+    if (!descriptor->Get(configurableName)->BooleanValue())
+        flags |= QJSValue::Undeletable;
+    if (!descriptor->Get(enumerableName)->BooleanValue())
+        flags |= QJSValue::SkipInEnumeration;
+
+    //"writable" is only a property of the descriptor if it is not an accessor
+    if (descriptor->Has(writableName)) {
+        if (!descriptor->Get(writableName)->BooleanValue())
+            flags |= QJSValue::ReadOnly;
+    } else {
+//        if (descriptor->Get(getName)->IsObject())
+//            flags |= QScriptValue::PropertyGetter;
+//        if (descriptor->Get(setName)->IsObject())
+//            flags |= QScriptValue::PropertySetter;
+    }
+
+    return QJSValue::PropertyFlag(flags);
+}
+
+inline v8::Local<v8::Object> QScriptOriginalGlobalObject::getOwnPropertyDescriptor(v8::Handle<v8::Object> object, v8::Handle<v8::Value> property) const
+{
+    Q_ASSERT(object->IsObject());
+    Q_ASSERT(!property.IsEmpty());
+    // FIXME do we need try catch here?
+    v8::Handle<v8::Value> argv[] = {object, property};
+    v8::Local<v8::Value> descriptor = m_ownPropertyDescriptor->Call(m_globalObject, /* argc */ 2, argv);
+    if (descriptor.IsEmpty() || !descriptor->IsObject())
+        return v8::Local<v8::Object>();
+    return v8::Local<v8::Object>::Cast(descriptor);
+}
+
+inline bool QScriptOriginalGlobalObject::strictlyEquals(v8::Handle<v8::Object> object)
+{
+    return m_globalObject->GetPrototype()->StrictEquals(object);
+}
+
+QT_END_NAMESPACE
+
+#endif