111 lines
3.4 KiB
C++
111 lines
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* Implementation of DOM Traversal's nsIDOMTreeWalker
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*/
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#ifndef mozilla_dom_TreeWalker_h
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#define mozilla_dom_TreeWalker_h
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#include "nsIDOMTreeWalker.h"
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#include "nsTraversal.h"
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#include "nsCOMPtr.h"
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#include "nsTArray.h"
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#include "nsCycleCollectionParticipant.h"
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class nsINode;
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class nsIDOMNode;
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namespace mozilla {
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namespace dom {
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class TreeWalker final : public nsIDOMTreeWalker, public nsTraversal
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{
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virtual ~TreeWalker();
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public:
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_NSIDOMTREEWALKER
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TreeWalker(nsINode *aRoot,
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uint32_t aWhatToShow,
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NodeFilterHolder aFilter);
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NS_DECL_CYCLE_COLLECTION_CLASS(TreeWalker)
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// WebIDL API
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nsINode* Root() const
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{
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return mRoot;
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}
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uint32_t WhatToShow() const
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{
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return mWhatToShow;
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}
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already_AddRefed<NodeFilter> GetFilter()
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{
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return mFilter.ToWebIDLCallback();
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}
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nsINode* CurrentNode() const
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{
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return mCurrentNode;
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}
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void SetCurrentNode(nsINode& aNode, ErrorResult& aResult);
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// All our traversal methods return strong refs because filtering can
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// remove nodes from the tree.
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already_AddRefed<nsINode> ParentNode(ErrorResult& aResult);
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already_AddRefed<nsINode> FirstChild(ErrorResult& aResult);
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already_AddRefed<nsINode> LastChild(ErrorResult& aResult);
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already_AddRefed<nsINode> PreviousSibling(ErrorResult& aResult);
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already_AddRefed<nsINode> NextSibling(ErrorResult& aResult);
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already_AddRefed<nsINode> PreviousNode(ErrorResult& aResult);
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already_AddRefed<nsINode> NextNode(ErrorResult& aResult);
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bool WrapObject(JSContext *aCx, JS::Handle<JSObject*> aGivenProto, JS::MutableHandle<JSObject*> aReflector);
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private:
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nsCOMPtr<nsINode> mCurrentNode;
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/*
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* Implements FirstChild and LastChild which only vary in which direction
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* they search.
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* @param aReversed Controls whether we search forwards or backwards
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* @param aResult Whether we threw or not.
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* @returns The desired node. Null if no child is found
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*/
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already_AddRefed<nsINode> FirstChildInternal(bool aReversed,
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ErrorResult& aResult);
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/*
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* Implements NextSibling and PreviousSibling which only vary in which
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* direction they search.
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* @param aReversed Controls whether we search forwards or backwards
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* @param aResult Whether we threw or not.
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* @returns The desired node. Null if no child is found
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*/
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already_AddRefed<nsINode> NextSiblingInternal(bool aReversed,
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ErrorResult& aResult);
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// Implementation for our various XPCOM getters
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typedef already_AddRefed<nsINode> (TreeWalker::*NodeGetter)(ErrorResult&);
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inline nsresult ImplNodeGetter(NodeGetter aGetter, nsIDOMNode** aRetval)
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{
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mozilla::ErrorResult rv;
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nsCOMPtr<nsINode> node = (this->*aGetter)(rv);
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if (rv.Failed()) {
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return rv.StealNSResult();
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}
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*aRetval = node ? node.forget().take()->AsDOMNode() : nullptr;
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return NS_OK;
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}
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};
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} // namespace dom
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} // namespace mozilla
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#endif // mozilla_dom_TreeWalker_h
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