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
41namespace blink {
42
43V8NodeFilterCondition::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
56V8NodeFilterCondition::~V8NodeFilterCondition()
57{
58}
59
60short 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
101void V8NodeFilterCondition::setWeakCallback(const v8::WeakCallbackData<v8::Value, V8NodeFilterCondition>& data)
102{
103    data.GetParameter()->m_filter.clear();
104}
105
106} // namespace blink
107