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 * 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.
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 * 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
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 */

#include "config.h"
#include "bindings/v8/V8NodeFilterCondition.h"

#include "V8Node.h"
#include "bindings/v8/ScriptController.h"
#include "bindings/v8/ScriptState.h"
#include "bindings/v8/V8HiddenPropertyName.h"
#include "core/dom/Node.h"
#include "core/dom/NodeFilter.h"
#include "wtf/OwnArrayPtr.h"

namespace WebCore {

V8NodeFilterCondition::V8NodeFilterCondition(v8::Handle<v8::Value> filter, v8::Handle<v8::Object> owner)
    : m_filter(filter)
{
    owner->SetHiddenValue(V8HiddenPropertyName::condition(), filter);
    m_filter.makeWeak(this, &makeWeakCallback);
}

V8NodeFilterCondition::~V8NodeFilterCondition()
{
}

short V8NodeFilterCondition::acceptNode(ScriptState* state, Node* node) const
{
    ASSERT(v8::Context::InContext());

    v8::Isolate* isolate = state->isolate();
    v8::HandleScope handleScope(isolate);
    v8::Handle<v8::Value> filter = m_filter.newLocal(isolate);
    ASSERT(!filter.IsEmpty());
    if (!filter->IsObject())
        return NodeFilter::FILTER_ACCEPT;

    v8::TryCatch exceptionCatcher;

    v8::Handle<v8::Function> callback;
    if (filter->IsFunction())
        callback = v8::Handle<v8::Function>::Cast(filter);
    else {
        v8::Local<v8::Value> value = filter->ToObject()->Get(v8::String::NewSymbol("acceptNode"));
        if (!value->IsFunction()) {
            throwTypeError("NodeFilter object does not have an acceptNode function", state->isolate());
            return NodeFilter::FILTER_REJECT;
        }
        callback = v8::Handle<v8::Function>::Cast(value);
    }

    OwnArrayPtr<v8::Handle<v8::Value> > args = adoptArrayPtr(new v8::Handle<v8::Value>[1]);
    args[0] = toV8(node, v8::Handle<v8::Object>(), state->isolate());

    v8::Handle<v8::Object> object = v8::Context::GetCurrent()->Global();
    v8::Handle<v8::Value> result = ScriptController::callFunctionWithInstrumentation(0, callback, object, 1, args.get());

    if (exceptionCatcher.HasCaught()) {
        state->setException(exceptionCatcher.Exception());
        return NodeFilter::FILTER_REJECT;
    }

    ASSERT(!result.IsEmpty());

    return result->Int32Value();
}

void V8NodeFilterCondition::makeWeakCallback(v8::Isolate*, v8::Persistent<v8::Value>*, V8NodeFilterCondition* condition)
{
    condition->m_filter.clear();
}

} // namespace WebCore