зеркало из https://github.com/mozilla/pjs.git
120 строки
3.5 KiB
C++
120 строки
3.5 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is the Mozilla browser.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications, Inc. Portions created by Netscape are
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* Copyright (C) 1999, Mozilla. All Rights Reserved.
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*
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* Contributor(s):
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* Adam Lock <adamlock@netscape.com>
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*/
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#include "nsVoidArray.h"
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#include "nsCOMPtr.h"
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#include "nsDOMWalker.h"
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struct DOMTreePos
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{
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nsCOMPtr<nsIDOMNode> current;
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};
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nsresult nsDOMWalker::WalkDOM(nsIDOMNode *aRootNode, nsDOMWalkerCallback *aCallback)
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{
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NS_ENSURE_ARG_POINTER(aRootNode);
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NS_ENSURE_ARG_POINTER(aCallback);
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nsVoidArray stack;
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nsresult rv = NS_OK;
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// Push the top most node onto the stack
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DOMTreePos *rootPos = new DOMTreePos;
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if (rootPos == nsnull)
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{
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return NS_ERROR_OUT_OF_MEMORY;
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}
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rootPos->current = aRootNode;
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stack.AppendElement(rootPos);
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while (stack.Count() > 0)
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{
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nsCOMPtr<nsIDOMNode> current;
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nsCOMPtr<nsIDOMNode> next;
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// Pop the last position off the stack
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DOMTreePos *pos = (DOMTreePos *) stack.ElementAt(stack.Count() - 1);
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stack.RemoveElementAt(stack.Count() - 1);
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current = do_QueryInterface(pos->current);
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delete pos;
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// Iterate through each sibling
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while (current)
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{
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PRBool hasChildNodes = PR_FALSE;
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current->GetNextSibling(getter_AddRefs(next));
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current->HasChildNodes(&hasChildNodes);
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// Call the callback to let them do what they want to do
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if (aCallback)
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{
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PRBool abort = PR_FALSE;
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aCallback->OnWalkDOMNode(current, &abort);
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if (abort)
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{
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goto cleanup;
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}
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}
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if (hasChildNodes)
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{
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// Push the current node back onto the stack
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if (next)
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{
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DOMTreePos *nextPos = new DOMTreePos;
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if (nextPos == nsnull)
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{
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rv = NS_ERROR_OUT_OF_MEMORY;
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goto cleanup;
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}
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nextPos->current = next;
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stack.AppendElement(nextPos);
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}
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// Push the first child onto the stack
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DOMTreePos *childPos = new DOMTreePos;
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if (childPos == nsnull)
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{
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rv = NS_ERROR_OUT_OF_MEMORY;
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goto cleanup;
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}
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current->GetFirstChild(getter_AddRefs(childPos->current));
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stack.AppendElement(childPos);
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break;
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}
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current = next;
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}
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}
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cleanup:
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// Clean the tree in case we came out early
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PRInt32 i;
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for (i = 0; i < stack.Count(); i++)
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{
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DOMTreePos *pos = (DOMTreePos *) stack.ElementAt(i);
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delete pos;
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}
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stack.Clear();
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return rv;
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}
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