Source/WebCore/bridge/objc/objc_runtime.h

/*
 * Copyright (C) 2004-2019 Apple 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:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#ifndef KJS_BINDINGS_OBJC_RUNTIME_H
#define KJS_BINDINGS_OBJC_RUNTIME_H

#include "BridgeJSC.h"
#include "JSDOMBinding.h"
#include "objc_header.h"
#include <JavaScriptCore/JSGlobalObject.h>
#include <wtf/RetainPtr.h>

namespace JSC {
namespace Bindings {

ClassStructPtr webScriptObjectClass();
ClassStructPtr webUndefinedClass();

class ObjcInstance;

class ObjcField : public Field {
public:
    ObjcField(IvarStructPtr);
    ObjcField(CFStringRef name);
    
    virtual JSValue valueFromInstance(JSGlobalObject*, const Instance*) const;
    virtual bool setValueToInstance(JSGlobalObject*, const Instance*, JSValue) const;

private:
    IvarStructPtr _ivar;
    RetainPtr<CFStringRef> _name;
};

class ObjcMethod : public Method {
public:
    ObjcMethod() : _objcClass(0), _selector(0), _javaScriptName(0) {}
    ObjcMethod(ClassStructPtr aClass, SEL _selector);

    virtual int numParameters() const;

    NSMethodSignature *getMethodSignature() const;

    bool isFallbackMethod() const;
    void setJavaScriptName(CFStringRef n) { _javaScriptName = n; }
    CFStringRef javaScriptName() const { return _javaScriptName.get(); }
    
    SEL selector() const { return _selector; }

private:
    ClassStructPtr _objcClass;
    SEL _selector;
    RetainPtr<CFStringRef> _javaScriptName;
};

class ObjcArray : public Array {
public:
    ObjcArray(ObjectStructPtr, RefPtr<RootObject>&&);

    virtual bool setValueAt(JSGlobalObject*, unsigned int index, JSValue aValue) const;
    virtual JSValue valueAt(JSGlobalObject*, unsigned int index) const;
    virtual unsigned int getLength() const;
    
    ObjectStructPtr getObjcArray() const { return _array.get(); }

private:
    RetainPtr<ObjectStructPtr> _array;
};

class ObjcFallbackObjectImp : public JSDestructibleObject {
public:
    typedef JSDestructibleObject Base;
    static constexpr unsigned StructureFlags = Base::StructureFlags | OverridesGetOwnPropertySlot | OverridesGetCallData;

    static ObjcFallbackObjectImp* create(JSGlobalObject* exec, JSGlobalObject* globalObject, ObjcInstance* instance, const String& propertyName)
    {
        VM& vm = globalObject->vm();
        // FIXME: deprecatedGetDOMStructure uses the prototype off of the wrong global object
        Structure* domStructure = WebCore::deprecatedGetDOMStructure<ObjcFallbackObjectImp>(exec);
        ObjcFallbackObjectImp* fallbackObject = new (NotNull, allocateCell<ObjcFallbackObjectImp>(vm.heap)) ObjcFallbackObjectImp(globalObject, domStructure, instance, propertyName);
        fallbackObject->finishCreation(globalObject);
        return fallbackObject;
    }

    DECLARE_INFO;

    const String& propertyName() const { return m_item; }

    static ObjectPrototype* createPrototype(VM&, JSGlobalObject& globalObject)
    {
        return globalObject.objectPrototype();
    }

    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
    {
        return Structure::create(vm, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), info());
    }

protected:
    void finishCreation(JSGlobalObject*);

private:
    ObjcFallbackObjectImp(JSGlobalObject*, Structure*, ObjcInstance*, const String& propertyName);
    static void destroy(JSCell*);
    static bool getOwnPropertySlot(JSObject*, JSGlobalObject*, PropertyName, PropertySlot&);
    static bool put(JSCell*, JSGlobalObject*, PropertyName, JSValue, PutPropertySlot&);
    static CallType getCallData(JSCell*, CallData&);
    static bool deleteProperty(JSCell*, JSGlobalObject*, PropertyName);
    static JSValue defaultValue(const JSObject*, JSGlobalObject*, PreferredPrimitiveType);

    bool toBoolean(JSGlobalObject*) const; // FIXME: Currently this is broken because none of the superclasses are marked virtual. We need to solve this in the longer term.

    RefPtr<ObjcInstance> _instance;
    String m_item;
};

} // namespace Bindings
} // namespace JSC

#endif