V8Binding/binding/V8Utilities.cpp

/*
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 * in the documentation and/or other materials provided with the
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#include "config.h"
#include "V8Utilities.h"

#include <v8.h>

#include "V8CustomBinding.h"
#include "V8Proxy.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::Local<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::Local<v8::Object> object, v8::Local<v8::Value> value, int cacheIndex)
{
    v8::Local<v8::Value> cache = object->GetInternalField(cacheIndex);
    ASSERT(cache->IsArray());
    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;
        }
    }

    // We should only get here if we try to remove an event listener that was never added.
    ASSERT_NOT_REACHED();
}

#if PLATFORM(ANDROID)
  // The functions below are not needed on Android.
#else
bool processingUserGesture()
{
    Frame* frame = V8Proxy::retrieveFrameForEnteredContext();
    return frame && frame->script()->processingUserGesture();
}

bool shouldAllowNavigation(Frame* frame)
{
    Frame* callingFrame = V8Proxy::retrieveFrameForCallingContext();
    return callingFrame && callingFrame->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* callingFrame = V8Proxy::retrieveFrameForCallingContext();
    if (!callingFrame)
        return;

    if (!protocolIsJavaScript(url) || ScriptController::isSafeScript(frame))
        frame->loader()->scheduleLocationChange(url.string(), callingFrame->loader()->outgoingReferrer(), lockHistory, lockBackForwardList, processingUserGesture());
}
#endif // PLATFORM(ANDROID)

} // namespace WebCore