/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ /* * Implementation of DOM Traversal's nsIDOMNodeIterator */ #ifndef mozilla_dom_NodeIterator_h #define mozilla_dom_NodeIterator_h #include "nsIDOMNodeIterator.h" #include "nsTraversal.h" #include "nsCycleCollectionParticipant.h" #include "nsStubMutationObserver.h" class nsINode; class nsIDOMNode; namespace mozilla { namespace dom { class NodeIterator MOZ_FINAL : public nsIDOMNodeIterator, public nsTraversal, public nsStubMutationObserver { public: NS_DECL_CYCLE_COLLECTING_ISUPPORTS NS_DECL_NSIDOMNODEITERATOR NodeIterator(nsINode *aRoot, uint32_t aWhatToShow, const NodeFilterHolder &aFilter); NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(NodeIterator, nsIDOMNodeIterator) // WebIDL API nsINode* Root() const { return mRoot; } nsINode* GetReferenceNode() const { return mPointer.mNode; } bool PointerBeforeReferenceNode() const { return mPointer.mBeforeNode; } uint32_t WhatToShow() const { return mWhatToShow; } already_AddRefed GetFilter() { return mFilter.ToWebIDLCallback(); } already_AddRefed NextNode(ErrorResult& aResult) { return NextOrPrevNode(&NodePointer::MoveToNext, aResult); } already_AddRefed PreviousNode(ErrorResult& aResult) { return NextOrPrevNode(&NodePointer::MoveToPrevious, aResult); } // The XPCOM Detach() is fine for our purposes JSObject* WrapObject(JSContext *cx); private: virtual ~NodeIterator(); struct NodePointer { NodePointer() : mNode(nullptr) {} NodePointer(nsINode *aNode, bool aBeforeNode); typedef bool (NodePointer::*MoveToMethodType)(nsINode*); bool MoveToNext(nsINode *aRoot); bool MoveToPrevious(nsINode *aRoot); bool MoveForward(nsINode *aRoot, nsINode *aNode); void MoveBackward(nsINode *aParent, nsINode *aNode); void AdjustAfterRemoval(nsINode *aRoot, nsINode *aContainer, nsIContent *aChild, nsIContent *aPreviousSibling); void Clear() { mNode = nullptr; } nsINode *mNode; bool mBeforeNode; }; // Implementation for some of our XPCOM getters typedef already_AddRefed (NodeIterator::*NodeGetter)(ErrorResult&); inline nsresult ImplNodeGetter(NodeGetter aGetter, nsIDOMNode** aRetval) { mozilla::ErrorResult rv; nsCOMPtr node = (this->*aGetter)(rv); if (rv.Failed()) { return rv.ErrorCode(); } *aRetval = node ? node.forget().take()->AsDOMNode() : nullptr; return NS_OK; } // Have to return a strong ref, because the act of testing the node can // remove it from the DOM so we're holding the only ref to it. already_AddRefed NextOrPrevNode(NodePointer::MoveToMethodType aMove, ErrorResult& aResult); NodePointer mPointer; NodePointer mWorkingPointer; }; } // namespace dom } // namespace mozilla #endif // mozilla_dom_NodeIterator_h