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| 1 /* | |
| 2 * Copyright (C) 2006, 2007, 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 #ifndef V8NodeFilterCondition_h | |
| 32 #define V8NodeFilterCondition_h | |
| 33 | |
| 34 #include "bindings/v8/ScopedPersistent.h" | |
| 35 #include "bindings/v8/ScriptState.h" | |
| 36 #include "core/dom/NodeFilterCondition.h" | |
| 37 #include "platform/heap/Handle.h" | |
| 38 #include <v8.h> | |
| 39 #include "wtf/PassRefPtr.h" | |
| 40 | |
| 41 namespace WebCore { | |
| 42 | |
| 43 class Node; | |
| 44 class ExceptionState; | |
| 45 | |
| 46 // V8NodeFilterCondition maintains a Javascript implemented callback for | |
| 47 // filtering Node returned by NodeIterator/TreeWalker. | |
| 48 // A NodeFilterCondition is referenced by a NodeFilter, and A NodeFilter is | |
| 49 // referenced by a NodeIterator/TreeWalker. As V8NodeFilterCondition maintains | |
| 50 // a Javascript callback which may reference Document, we need to avoid circular | |
| 51 // reference spanning V8/Blink object space. | |
| 52 // To address this issue, V8NodeFilterCondition holds a weak reference to | |
| 53 // |m_filter|, the Javascript value, and the whole reference is exposed to V8 to | |
| 54 // let V8 GC handle collection of |m_filter|. | |
| 55 // (DOM) | |
| 56 // NodeIterator ----RefPtr----> NodeFilter ----RefPtr----> NodeFilterCondition | |
| 57 // | ^ | ^ | | |
| 58 // weak | weak | ScopedPersistent(weak) | |
| 59 // | RefPtr | RefPtr | | |
| 60 // v | v | v | |
| 61 // NodeIterator --HiddenValue--> NodeFilter --HiddenValue--> JS Callback | |
| 62 // (V8) | |
| 63 class V8NodeFilterCondition FINAL : public NodeFilterCondition { | |
| 64 public: | |
| 65 static PassRefPtrWillBeRawPtr<V8NodeFilterCondition> create(v8::Handle<v8::V
alue> filter, v8::Handle<v8::Object> owner, ScriptState* scriptState) | |
| 66 { | |
| 67 return adoptRefWillBeNoop(new V8NodeFilterCondition(filter, owner, scrip
tState)); | |
| 68 } | |
| 69 | |
| 70 virtual ~V8NodeFilterCondition(); | |
| 71 | |
| 72 virtual short acceptNode(Node*, ExceptionState&) const OVERRIDE; | |
| 73 | |
| 74 private: | |
| 75 // As the value |filter| is maintained by V8GC, the |owner| which references | |
| 76 // V8NodeFilterCondition, usually a wrapper of NodeFilter, is specified here | |
| 77 // to hold a strong reference to |filter|. | |
| 78 V8NodeFilterCondition(v8::Handle<v8::Value> filter, v8::Handle<v8::Object> o
wner, ScriptState*); | |
| 79 | |
| 80 static void setWeakCallback(const v8::WeakCallbackData<v8::Value, V8NodeFilt
erCondition>&); | |
| 81 | |
| 82 RefPtr<ScriptState> m_scriptState; | |
| 83 ScopedPersistent<v8::Value> m_filter; | |
| 84 }; | |
| 85 | |
| 86 } // namespace WebCore | |
| 87 | |
| 88 #endif // V8NodeFilterCondition_h | |
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Chromium Code Reviews
Issue 351423002:
Moved files under Source/bindings/v8 to Source/bindings/core/v8. (Closed)
Base URL: svn://svn.chromium.org/blink/trunk