--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/bindings/v8/V8Utilities.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,154 @@
+/*
+ * Copyright (C) 2008, 2009 Google 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:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "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 THE COPYRIGHT
+ * OWNER 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 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "V8Utilities.h"
+
+#include <v8.h>
+
+#include "Document.h"
+#include "Frame.h"
+#include "ScriptExecutionContext.h"
+#include "ScriptState.h"
+#include "V8Binding.h"
+#include "V8Proxy.h"
+#include "WorkerContext.h"
+#include "WorkerContextExecutionProxy.h"
+
+#include <wtf/Assertions.h>
+#include "Frame.h"
+
+namespace WebCore {
+
+// Use an array to hold dependents. It works like a ref-counted scheme.
+// A value can be added more than once to the DOM object.
+void createHiddenDependency(v8::Handle<v8::Object> object, v8::Local<v8::Value> value, int cacheIndex)
+{
+    v8::Local<v8::Value> cache = object->GetInternalField(cacheIndex);
+    if (cache->IsNull() || cache->IsUndefined()) {
+        cache = v8::Array::New();
+        object->SetInternalField(cacheIndex, cache);
+    }
+
+    v8::Local<v8::Array> cacheArray = v8::Local<v8::Array>::Cast(cache);
+    cacheArray->Set(v8::Integer::New(cacheArray->Length()), value);
+}
+
+void removeHiddenDependency(v8::Handle<v8::Object> object, v8::Local<v8::Value> value, int cacheIndex)
+{
+    v8::Local<v8::Value> cache = object->GetInternalField(cacheIndex);
+    if (!cache->IsArray())
+        return;
+    v8::Local<v8::Array> cacheArray = v8::Local<v8::Array>::Cast(cache);
+    for (int i = cacheArray->Length() - 1; i >= 0; --i) {
+        v8::Local<v8::Value> cached = cacheArray->Get(v8::Integer::New(i));
+        if (cached->StrictEquals(value)) {
+            cacheArray->Delete(i);
+            return;
+        }
+    }
+}
+    
+void transferHiddenDependency(v8::Handle<v8::Object> object,
+                              EventListener* oldValue, 
+                              v8::Local<v8::Value> newValue, 
+                              int cacheIndex)
+{
+    if (oldValue) {
+        V8AbstractEventListener* oldListener = V8AbstractEventListener::cast(oldValue);
+        if (oldListener) {
+            v8::Local<v8::Object> oldListenerObject = oldListener->getExistingListenerObject();
+            if (!oldListenerObject.IsEmpty())
+                removeHiddenDependency(object, oldListenerObject, cacheIndex);
+        }
+    }
+    if (!newValue->IsNull() && !newValue->IsUndefined())
+        createHiddenDependency(object, newValue, cacheIndex);
+}
+    
+
+bool processingUserGesture()
+{
+    Frame* frame = V8Proxy::retrieveFrameForEnteredContext();
+    return frame && frame->script()->processingUserGesture();
+}
+
+Frame* callingOrEnteredFrame()
+{
+    Frame* frame = V8Proxy::retrieveFrameForCallingContext();
+    if (!frame) {
+        // Unfortunately, when processing script from a plug-in, we might not
+        // have a calling context.  In those cases, we fall back to the
+        // entered context for security checks.
+        // FIXME: We need a better API for retrieving frames that abstracts
+        //        away this concern.
+        frame = V8Proxy::retrieveFrameForEnteredContext();
+    }
+    return frame;
+}
+
+bool shouldAllowNavigation(Frame* frame)
+{
+    Frame* callingOrEntered = callingOrEnteredFrame();
+    return callingOrEntered && callingOrEntered->loader()->shouldAllowNavigation(frame);
+}
+
+KURL completeURL(const String& relativeURL)
+{
+    // For histoical reasons, we need to complete the URL using the dynamic frame.
+    Frame* frame = V8Proxy::retrieveFrameForEnteredContext();
+    if (!frame)
+        return KURL();
+    return frame->loader()->completeURL(relativeURL);
+}
+
+void navigateIfAllowed(Frame* frame, const KURL& url, bool lockHistory, bool lockBackForwardList)
+{
+    Frame* callingOrEntered = callingOrEnteredFrame();
+    if (!callingOrEntered)
+        return;
+    if (!protocolIsJavaScript(url) || ScriptController::isSafeScript(frame))
+        frame->redirectScheduler()->scheduleLocationChange(url.string(), callingOrEntered->loader()->outgoingReferrer(), lockHistory, lockBackForwardList, processingUserGesture());
+}
+
+ScriptExecutionContext* getScriptExecutionContext()
+{
+#if ENABLE(WORKERS)
+    if (WorkerScriptController* controller = WorkerScriptController::controllerForContext())
+        return controller->workerContext();
+#endif
+
+    if (Frame* frame = V8Proxy::retrieveFrameForCurrentContext())
+        return frame->document()->scriptExecutionContext();
+
+    return 0;
+}
+
+} // namespace WebCore