third_party/WebKit/Source/bindings/core/v8/V8NodeFilterCondition.cpp

/*
 * 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 "bindings/core/v8/V8NodeFilterCondition.h"

#include "bindings/core/v8/ScriptController.h"
#include "bindings/core/v8/ScriptState.h"
#include "bindings/core/v8/V8Node.h"
#include "bindings/core/v8/V8PrivateProperty.h"
#include "core/dom/Node.h"
#include "core/dom/NodeFilter.h"
#include "core/frame/UseCounter.h"

namespace blink {

V8NodeFilterCondition::V8NodeFilterCondition(v8::Local<v8::Value> filter,
                                             v8::Local<v8::Object> owner,
                                             ScriptState* scriptState)
    : m_scriptState(scriptState) {
  // ..acceptNode(..) will only dispatch m_filter if m_filter->IsObject().
  // We'll make sure m_filter is either usable by acceptNode or empty.
  // (See the fast/dom/node-filter-gc test for a case where 'empty' happens.)
  if (!filter.IsEmpty() && filter->IsObject()) {
    V8PrivateProperty::getV8NodeFilterConditionFilter(scriptState->isolate())
        .set(scriptState->context(), owner, filter);
    m_filter.set(scriptState->isolate(), filter);
    m_filter.setPhantom();
  }
}

V8NodeFilterCondition::~V8NodeFilterCondition() {}

unsigned V8NodeFilterCondition::acceptNode(
    Node* node,
    ExceptionState& exceptionState) const {
  v8::Isolate* isolate = m_scriptState->isolate();
  ASSERT(!m_scriptState->context().IsEmpty());
  v8::HandleScope handleScope(isolate);
  v8::Local<v8::Value> filter = m_filter.newLocal(isolate);

  ASSERT(filter.IsEmpty() || filter->IsObject());
  if (filter.IsEmpty())
    return NodeFilter::kFilterAccept;

  v8::TryCatch exceptionCatcher(isolate);

  v8::Local<v8::Function> callback;
  v8::Local<v8::Value> receiver;
  if (filter->IsFunction()) {
    UseCounter::countIfNotPrivateScript(isolate,
                                        currentExecutionContext(isolate),
                                        UseCounter::NodeFilterIsFunction);
    callback = v8::Local<v8::Function>::Cast(filter);
    receiver = v8::Undefined(isolate);
  } else {
    v8::Local<v8::Object> filterObject;
    if (!filter->ToObject(m_scriptState->context()).ToLocal(&filterObject)) {
      exceptionState.throwTypeError("NodeFilter is not an object");
      return NodeFilter::kFilterReject;
    }
    v8::Local<v8::Value> value;
    if (!filterObject
             ->Get(m_scriptState->context(),
                   v8AtomicString(isolate, "acceptNode"))
             .ToLocal(&value) ||
        !value->IsFunction()) {
      exceptionState.throwTypeError(
          "NodeFilter object does not have an acceptNode function");
      return NodeFilter::kFilterReject;
    }
    UseCounter::countIfNotPrivateScript(isolate,
                                        currentExecutionContext(isolate),
                                        UseCounter::NodeFilterIsObject);
    callback = v8::Local<v8::Function>::Cast(value);
    receiver = filter;
  }

  v8::Local<v8::Value> nodeWrapper = toV8(node, m_scriptState.get());
  if (nodeWrapper.IsEmpty()) {
    if (exceptionCatcher.HasCaught())
      exceptionState.rethrowV8Exception(exceptionCatcher.Exception());
    return NodeFilter::kFilterReject;
  }

  v8::Local<v8::Value> result;
  v8::Local<v8::Value> args[] = {nodeWrapper};
  if (!V8ScriptRunner::callFunction(callback,
                                    m_scriptState->getExecutionContext(),
                                    receiver, 1, args, isolate)
           .ToLocal(&result)) {
    exceptionState.rethrowV8Exception(exceptionCatcher.Exception());
    return NodeFilter::kFilterReject;
  }

  ASSERT(!result.IsEmpty());

  uint32_t uint32Value;
  if (!v8Call(result->Uint32Value(m_scriptState->context()), uint32Value,
              exceptionCatcher)) {
    exceptionState.rethrowV8Exception(exceptionCatcher.Exception());
    return NodeFilter::kFilterReject;
  }
  return uint32Value;
}

}  // namespace blink