The Tor Browser / file comparison
comparison: content/base/src/TreeWalker.h
content/base/src/TreeWalker.h
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| 1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ | |
| 2 /* vim: set ts=4 et sw=4 tw=80: */ | |
| 3 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 4 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 6 | |
| 7 /* | |
| 8 * Implementation of DOM Traversal's nsIDOMTreeWalker | |
| 9 */ | |
| 10 | |
| 11 #ifndef mozilla_dom_TreeWalker_h | |
| 12 #define mozilla_dom_TreeWalker_h | |
| 13 | |
| 14 #include "nsIDOMTreeWalker.h" | |
| 15 #include "nsTraversal.h" | |
| 16 #include "nsCOMPtr.h" | |
| 17 #include "nsTArray.h" | |
| 18 #include "nsCycleCollectionParticipant.h" | |
| 19 | |
| 20 class nsINode; | |
| 21 class nsIDOMNode; | |
| 22 | |
| 23 namespace mozilla { | |
| 24 namespace dom { | |
| 25 | |
| 26 class TreeWalker MOZ_FINAL : public nsIDOMTreeWalker, public nsTraversal | |
| 27 { | |
| 28 public: | |
| 29 NS_DECL_CYCLE_COLLECTING_ISUPPORTS | |
| 30 NS_DECL_NSIDOMTREEWALKER | |
| 31 | |
| 32 TreeWalker(nsINode *aRoot, | |
| 33 uint32_t aWhatToShow, | |
| 34 const NodeFilterHolder &aFilter); | |
| 35 virtual ~TreeWalker(); | |
| 36 | |
| 37 NS_DECL_CYCLE_COLLECTION_CLASS(TreeWalker) | |
| 38 | |
| 39 // WebIDL API | |
| 40 nsINode* Root() const | |
| 41 { | |
| 42 return mRoot; | |
| 43 } | |
| 44 uint32_t WhatToShow() const | |
| 45 { | |
| 46 return mWhatToShow; | |
| 47 } | |
| 48 already_AddRefed<NodeFilter> GetFilter() | |
| 49 { | |
| 50 return mFilter.ToWebIDLCallback(); | |
| 51 } | |
| 52 nsINode* CurrentNode() const | |
| 53 { | |
| 54 return mCurrentNode; | |
| 55 } | |
| 56 void SetCurrentNode(nsINode& aNode, ErrorResult& aResult); | |
| 57 // All our traversal methods return strong refs because filtering can | |
| 58 // remove nodes from the tree. | |
| 59 already_AddRefed<nsINode> ParentNode(ErrorResult& aResult); | |
| 60 already_AddRefed<nsINode> FirstChild(ErrorResult& aResult); | |
| 61 already_AddRefed<nsINode> LastChild(ErrorResult& aResult); | |
| 62 already_AddRefed<nsINode> PreviousSibling(ErrorResult& aResult); | |
| 63 already_AddRefed<nsINode> NextSibling(ErrorResult& aResult); | |
| 64 already_AddRefed<nsINode> PreviousNode(ErrorResult& aResult); | |
| 65 already_AddRefed<nsINode> NextNode(ErrorResult& aResult); | |
| 66 | |
| 67 JSObject* WrapObject(JSContext *cx); | |
| 68 | |
| 69 private: | |
| 70 nsCOMPtr<nsINode> mCurrentNode; | |
| 71 | |
| 72 /* | |
| 73 * Implements FirstChild and LastChild which only vary in which direction | |
| 74 * they search. | |
| 75 * @param aReversed Controls whether we search forwards or backwards | |
| 76 * @param aResult Whether we threw or not. | |
| 77 * @returns The desired node. Null if no child is found | |
| 78 */ | |
| 79 already_AddRefed<nsINode> FirstChildInternal(bool aReversed, | |
| 80 ErrorResult& aResult); | |
| 81 | |
| 82 /* | |
| 83 * Implements NextSibling and PreviousSibling which only vary in which | |
| 84 * direction they search. | |
| 85 * @param aReversed Controls whether we search forwards or backwards | |
| 86 * @param aResult Whether we threw or not. | |
| 87 * @returns The desired node. Null if no child is found | |
| 88 */ | |
| 89 already_AddRefed<nsINode> NextSiblingInternal(bool aReversed, | |
| 90 ErrorResult& aResult); | |
| 91 | |
| 92 // Implementation for our various XPCOM getters | |
| 93 typedef already_AddRefed<nsINode> (TreeWalker::*NodeGetter)(ErrorResult&); | |
| 94 inline nsresult ImplNodeGetter(NodeGetter aGetter, nsIDOMNode** aRetval) | |
| 95 { | |
| 96 mozilla::ErrorResult rv; | |
| 97 nsCOMPtr<nsINode> node = (this->*aGetter)(rv); | |
| 98 if (rv.Failed()) { | |
| 99 return rv.ErrorCode(); | |
| 100 } | |
| 101 *aRetval = node ? node.forget().take()->AsDOMNode() : nullptr; | |
| 102 return NS_OK; | |
| 103 } | |
| 104 }; | |
| 105 | |
| 106 } // namespace dom | |
| 107 } // namespace mozilla | |
| 108 | |
| 109 #endif // mozilla_dom_TreeWalker_h | |
| 110 |
