File indexing completed on 2024-12-01 12:37:38

 /* This file is part of the KDE libraries
     Copyright (C) 2005, 2006 Ian Reinhart Geiser <geiseri@kde.org>
     Copyright (C) 2005, 2006 Matt Broadstone <mbroadst@gmail.com>
     Copyright (C) 2005, 2006 Richard J. Moore <rich@kde.org>
     Copyright (C) 2005, 2006 Erik L. Bunce <kde@bunce.us>
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
     version 2 of the License, or (at your option) any later version.
 
     This library is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Library General Public License for more details.
 
     You should have received a copy of the GNU Library General Public License
     along with this library; see the file COPYING.LIB.  If not, write to
     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     Boston, MA 02110-1301, USA.
 */
 
 #ifndef OBJECT_BINDING_H
 #define OBJECT_BINDING_H
 
 #include "static_binding.h"
 #include "variant_binding.h"
 #include "pointer.h"
 #include "kjseglobal.h"
 
 /**
 * A simple pointer style method.
 * This will extract the pointer, cast it to the native type and place it in "value".
 * Any data that should be returned from this method should be placed into "result";
 *
 */
 #define START_OBJECT_METHOD( METHODNAME, TYPE) \
     KJS::JSValue *METHODNAME( KJS::ExecState *exec, KJS::JSObject *self, const KJS::List &args ) \
     { \
         Q_UNUSED(exec);\
         Q_UNUSED(self);\
         Q_UNUSED(args);\
         KJS::JSValue *result = KJS::jsNull(); \
         KJSEmbed::ObjectBinding *imp = KJSEmbed::extractBindingImp<KJSEmbed::ObjectBinding>(exec, self ); \
         if( imp ) \
         { \
             TYPE *object = imp->object<TYPE>(); \
             if( object ) \
             {
 
 /**
 * End a variant method started by START_OBJECT_METHOD
 */
 #define END_OBJECT_METHOD \
     } \
     else \
         KJS::throwError(exec, KJS::ReferenceError, QString("O: The internal object died."));\
     } \
     else \
         KJS::throwError(exec, KJS::GeneralError, QString("Object cast failed."));\
     return result; \
     }
 
 #define START_STATIC_OBJECT_METHOD( METHODNAME ) \
     KJS::JSValue *METHODNAME( KJS::ExecState *exec, KJS::JSObject *self, const KJS::List &args ) \
     {\
         Q_UNUSED(exec);\
         Q_UNUSED(self);\
         Q_UNUSED(args);\
         KJS::JSValue *result = KJS::jsNull(); \
          
 #define END_STATIC_OBJECT_METHOD \
     return result; \
     }
 
 namespace KJSEmbed
 {
 class KJSEMBED_EXPORT ObjectFactory
 {
 public:
     static const Method ObjectMethods[];
     static const Method *methods()
     {
         return ObjectMethods;
     }
 };
 
 class KJSEMBED_EXPORT ObjectBinding : public ProxyBinding
 {
 public:
     enum Ownership { CPPOwned, QObjOwned, JSOwned  };
     static const KJS::ClassInfo info;
 
 private:
     const char *m_name;
     mutable PointerBase *m_value;
     Ownership m_owner;
 
 public:
     template <typename T>
     ObjectBinding(KJS::ExecState *exec, const char *typeName, T *ptr)
         : ProxyBinding(exec),
           m_name(typeName)
     {
         StaticBinding::publish(exec, this, ObjectFactory::methods());
 
         m_owner = CPPOwned;
         m_value = new Pointer<T>(ptr);
     }
 
     ~ObjectBinding() override;
 
     const char *typeName() const;
 
     /**
      * \return the internal object as a pointer of type T
      */
     template <typename T>
     T *object() const
     {
         if (m_value) {
             return pointer_cast<T>(m_value);
         } else {
             return nullptr;
         }
     }
 
     void *voidStar() const
     {
         return m_value->voidStar();
     }
 
     template <typename T>
     void setObject(T *ptr)
     {
         if (m_owner == JSOwned) {
             //qDebug("object cleans up");
             m_value->cleanup();
         }
         delete m_value;
         m_value = new Pointer<T>(ptr);
     }
 
     KJS::UString toString(KJS::ExecState *exec) const override;
     KJS::UString className() const override;
     KJS::JSType type() const override;
 
     Ownership ownership() const;
     void setOwnership(Ownership owner);
 
 };
 
 /**
 * Extracts a pointer based type from an ObjectBinding object.  Care should be taken that this method
 * is not used with KJSEmbed::ObjectBinding objects because the cast will fail.
 */
 template< typename T>
 T *extractObject(KJS::ExecState *exec, KJS::JSValue *arg, T *defaultValue)
 {
     if (!arg) {
         return defaultValue;
     } else {
         T *returnValue = nullptr;
         KJSEmbed::ObjectBinding *imp = KJSEmbed::extractBindingImp<KJSEmbed::ObjectBinding>(exec, arg);
         if (imp) {
             // GCC 3.3 has problems calling template functions in another class from a template class.
             // returnValue = imp->object<T>();
 
             returnValue = (T *)imp->voidStar();
         }
         if (returnValue) {
             return returnValue;
         } else {
             return defaultValue;
         }
     }
 }
 
 /**
 * Extracts a pointer from a KJS::List of KJS::JSValues.  If the argument is out of range the default value
 * is returned.
 */
 template< typename T>
 T *extractObject(KJS::ExecState *exec, const KJS::List &args, int idx, T *defaultValue = nullptr)
 {
     if (args.size() > idx) {
         return extractObject<T>(exec, args[idx], defaultValue);
     } else {
         return defaultValue;
     }
 }
 
 /**
 * Can create any known KJSEmbed::ObjectBinding object and set the value.
 * On failure a KJS::jsNull will be returned and the exception set.
 */
 template< typename T>
 KJS::JSValue *createObject(KJS::ExecState *exec, const KJS::UString &className, const T *value, KJSEmbed::ObjectBinding::Ownership owner = KJSEmbed::ObjectBinding::JSOwned)
 {
     if (nullptr == value) {
         return KJS::jsNull();
     }
 
     KJS::JSObject *parent = exec->dynamicInterpreter()->globalObject();
     KJS::JSObject *returnValue = StaticConstructor::construct(exec, parent, className);
     if (returnValue) {
         // If it is a value type setValue
         KJSEmbed::ObjectBinding *imp = extractBindingImp<KJSEmbed::ObjectBinding>(exec, returnValue);
         if (imp) {
             imp->setOwnership(KJSEmbed::ObjectBinding::JSOwned);
             imp->setObject(value);
             imp->setOwnership(owner);
         } else {
             throwError(exec, KJS::TypeError, i18n("%1 is not an Object type", className.ascii()));
             return KJS::jsNull();
         }
     } else {
         throwError(exec, KJS::GeneralError, "Could not construct value");
         //throwError(exec, "Could not construct value" );
         return KJS::jsNull();
     }
 
     return returnValue;
 }
 
 template< typename T >
 T extractParameter(KJS::ExecState *exec, KJS::JSValue *arg, const T &defaultValue)
 {
     if (!arg) {
         return defaultValue;
     } else {
         switch (arg->type()) {
         case KJS::NumberType:
             return extractInt(exec, arg, defaultValue);
             break;
         case KJS::BooleanType:
             return extractBool(exec, arg, 0);
             break;
         case KJS::UnspecifiedType:
         case KJS::UndefinedType:
         case KJS::NullType:
         case KJS::GetterSetterType:
         case KJS::StringType:
             return defaultValue;
             break;
         }
 
         KJS::JSObject *object = arg->toObject(exec);
         if (object->inherits(&VariantBinding::info)) {
             return extractVariant<T>(exec, arg, defaultValue);
         } else if (object->inherits(&ObjectBinding::info)) {
             return extractObject<T>(exec, arg, defaultValue);
         } else {
             return defaultValue;
         }
     }
 }
 }
 #endif