Core: Replace usage of QScriptEngine with QJSEngine

This replaces the dependency of Core on QtScript with the dependency on
QtQml.

Changes: QJSEngine manages the onwership of injected QObjects. The
Exception information is part of QJSValue instead of the engine.

Change-Id: I54e40a7f2f7795424c4f3e37d962ac59fc2b1a09
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>

src/plugins/coreplugin/corejsextensions.h

@@ -33,7 +33,6 @@
 
 #include <utils/stringutils.h>
 
-#include <QScriptEngine>
 #include <QSet>
 
 namespace Core {

src/plugins/coreplugin/coreplugin.pro

@@ -2,7 +2,7 @@ DEFINES += CORE_LIBRARY
 QT += help \
     network \
     printsupport \
-    script \
+    qml \
     sql
 
 # embedding build time information prevents repeatedly binary exact versions from same source code

src/plugins/coreplugin/jsexpander.cpp

@@ -37,7 +37,7 @@
 
 #include <QCoreApplication>
 #include <QDebug>
-#include <QScriptEngine>
+#include <QJSEngine>
 
 namespace Core {
 
@@ -45,10 +45,7 @@ namespace Internal {
 
 class JsExpanderPrivate {
 public:
-    ~JsExpanderPrivate() { qDeleteAll(m_registeredObjects); }
-
-    QScriptEngine m_engine;
-    QList<QObject *> m_registeredObjects;
+    QJSEngine m_engine;
 };
 
 } // namespace Internal
@@ -57,26 +54,23 @@ static Internal::JsExpanderPrivate *d;
 
 void JsExpander::registerQObjectForJs(const QString &name, QObject *obj)
 {
-    obj->setParent(0); // take ownership!
-    d->m_registeredObjects.append(obj);
-    QScriptValue jsObj = d->m_engine.newQObject(obj, QScriptEngine::QtOwnership);
+    QJSValue jsObj = d->m_engine.newQObject(obj);
     d->m_engine.globalObject().setProperty(name, jsObj);
 }
 
 QString JsExpander::evaluate(const QString &expression, QString *errorMessage)
 {
-    d->m_engine.clearExceptions();
-    QScriptValue value = d->m_engine.evaluate(expression);
-    if (d->m_engine.hasUncaughtException()) {
+    QJSValue value = d->m_engine.evaluate(expression);
+    if (value.isError()) {
         const QString msg = QCoreApplication::translate("Core::JsExpander", "Error in \"%1\": %2")
-                .arg(expression, d->m_engine.uncaughtException().toString());
+                .arg(expression, value.toString());
         if (errorMessage)
             *errorMessage = msg;
         return QString();
     }
     // Try to convert to bool, be that an int or whatever.
     if (value.isBool())
-        return value.toBool() ? QStringLiteral("true") : QStringLiteral("false");
+        return value.toString();
     if (value.isNumber())
         return QString::number(value.toNumber());
     if (value.isString())