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      1 /*
      2  * Copyright (C) 2008, 2009 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "bindings/core/v8/V8NodeFilterCondition.h"
     33 
     34 #include "bindings/core/v8/ScriptController.h"
     35 #include "bindings/core/v8/V8HiddenValue.h"
     36 #include "bindings/core/v8/V8Node.h"
     37 #include "core/dom/Node.h"
     38 #include "core/dom/NodeFilter.h"
     39 #include "wtf/OwnPtr.h"
     40 
     41 namespace blink {
     42 
     43 V8NodeFilterCondition::V8NodeFilterCondition(v8::Handle<v8::Value> filter, v8::Handle<v8::Object> owner, ScriptState* scriptState)
     44     : m_scriptState(scriptState)
     45 {
     46     // ..acceptNode(..) will only dispatch m_filter if m_filter->IsObject().
     47     // We'll make sure m_filter is either usable by acceptNode or empty.
     48     // (See the fast/dom/node-filter-gc test for a case where 'empty' happens.)
     49     if (!filter.IsEmpty() && filter->IsObject()) {
     50         V8HiddenValue::setHiddenValue(scriptState->isolate(), owner, V8HiddenValue::condition(scriptState->isolate()), filter);
     51         m_filter.set(scriptState->isolate(), filter);
     52         m_filter.setWeak(this, &setWeakCallback);
     53     }
     54 }
     55 
     56 V8NodeFilterCondition::~V8NodeFilterCondition()
     57 {
     58 }
     59 
     60 short V8NodeFilterCondition::acceptNode(Node* node, ExceptionState& exceptionState) const
     61 {
     62     v8::Isolate* isolate = m_scriptState->isolate();
     63     ASSERT(!m_scriptState->context().IsEmpty());
     64     v8::HandleScope handleScope(isolate);
     65     v8::Handle<v8::Value> filter = m_filter.newLocal(isolate);
     66 
     67     ASSERT(filter.IsEmpty() || filter->IsObject());
     68     if (filter.IsEmpty())
     69         return NodeFilter::FILTER_ACCEPT;
     70 
     71     v8::TryCatch exceptionCatcher;
     72 
     73     v8::Handle<v8::Function> callback;
     74     if (filter->IsFunction()) {
     75         callback = v8::Handle<v8::Function>::Cast(filter);
     76     } else {
     77         v8::Local<v8::Value> value = filter->ToObject()->Get(v8AtomicString(isolate, "acceptNode"));
     78         if (value.IsEmpty() || !value->IsFunction()) {
     79             exceptionState.throwTypeError("NodeFilter object does not have an acceptNode function");
     80             return NodeFilter::FILTER_REJECT;
     81         }
     82         callback = v8::Handle<v8::Function>::Cast(value);
     83     }
     84 
     85     OwnPtr<v8::Handle<v8::Value>[]> info = adoptArrayPtr(new v8::Handle<v8::Value>[1]);
     86     v8::Handle<v8::Object> context = m_scriptState->context()->Global();
     87     info[0] = toV8(node, context, isolate);
     88 
     89     v8::Handle<v8::Value> result = ScriptController::callFunction(m_scriptState->executionContext(), callback, context, 1, info.get(), isolate);
     90 
     91     if (exceptionCatcher.HasCaught()) {
     92         exceptionState.rethrowV8Exception(exceptionCatcher.Exception());
     93         return NodeFilter::FILTER_REJECT;
     94     }
     95 
     96     ASSERT(!result.IsEmpty());
     97 
     98     return result->Int32Value();
     99 }
    100 
    101 void V8NodeFilterCondition::setWeakCallback(const v8::WeakCallbackData<v8::Value, V8NodeFilterCondition>& data)
    102 {
    103     data.GetParameter()->m_filter.clear();
    104 }
    105 
    106 } // namespace blink
    107