API/JSCallbackConstructor.cpp

   1 // -*- mode: c++; c-basic-offset: 4 -*-
   2 /*
   3  * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  18  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  19  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  20  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  21  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  22  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #include "config.h"
  28 #include "JSCallbackConstructor.h"
  29
  30 #include "APICast.h"
  31 #include <kjs/JSGlobalObject.h>
  32 #include <kjs/object_object.h>
  33 #include <wtf/Vector.h>
  34
  35 namespace KJS {
  36
  37 const ClassInfo JSCallbackConstructor::info = { "CallbackConstructor", 0, 0};
  38
  39 JSCallbackConstructor::JSCallbackConstructor(ExecState* exec, JSClassRef jsClass, JSObjectCallAsConstructorCallback callback)
  40     : JSObject(exec->lexicalGlobalObject()->objectPrototype())
  41     , m_class(jsClass)
  42     , m_callback(callback)
  43 {
  44     if (m_class)
  45         JSClassRetain(jsClass);
  46 }
  47
  48 JSCallbackConstructor::~JSCallbackConstructor()
  49 {
  50     if (m_class)
  51         JSClassRelease(m_class);
  52 }
  53
  54 bool JSCallbackConstructor::implementsHasInstance() const
  55 {
  56     return true;
  57 }
  58
  59 bool JSCallbackConstructor::implementsConstruct() const
  60 {
  61     return true;
  62 }
  63
  64 JSObject* JSCallbackConstructor::construct(ExecState* exec, const List &args)
  65 {
  66     JSContextRef ctx = toRef(exec);
  67     JSObjectRef thisRef = toRef(this);
  68
  69     if (m_callback) {
  70         int argumentCount = static_cast<int>(args.size());
  71         Vector<JSValueRef, 16> arguments(argumentCount);
  72         for (int i = 0; i < argumentCount; i++)
  73             arguments[i] = toRef(args[i]);
  74
  75         JSLock::DropAllLocks dropAllLocks;
  76         return toJS(m_callback(ctx, thisRef, argumentCount, arguments.data(), toRef(exec->exceptionSlot())));
  77     }
  78
  79     return toJS(JSObjectMake(ctx, m_class, 0));
  80 }
  81
  82 } // namespace KJS