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117 lines
4.3 KiB
C++
117 lines
4.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Communicator client code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Original Author: David W. Hyatt (hyatt@netscape.com)
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/*
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* a class that walks the lexicographic tree of rule nodes as style
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* rules are matched
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*/
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#ifndef nsRuleWalker_h_
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#define nsRuleWalker_h_
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#include "nsRuleNode.h"
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#include "nsIStyleRule.h"
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class nsRuleWalker {
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public:
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nsRuleNode* CurrentNode() { return mCurrent; }
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void SetCurrentNode(nsRuleNode* aNode) {
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NS_ASSERTION(aNode, "Must have node here!");
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mCurrent = aNode;
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}
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void Forward(nsIStyleRule* aRule) {
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mCurrent = mCurrent->Transition(aRule, mLevel, mImportance);
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mCheckForImportantRules =
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mCheckForImportantRules && !aRule->GetImportantRule();
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NS_POSTCONDITION(mCurrent, "Transition messed up");
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}
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void Reset() { mCurrent = mRoot; }
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PRBool AtRoot() { return mCurrent == mRoot; }
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void SetLevel(PRUint8 aLevel, PRBool aImportance,
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PRBool aCheckForImportantRules) {
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NS_ASSERTION(!aCheckForImportantRules || !aImportance,
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"Shouldn't be checking for important rules while walking "
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"important rules");
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mLevel = aLevel;
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mImportance = aImportance;
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mCheckForImportantRules = aCheckForImportantRules;
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}
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PRUint8 GetLevel() const { return mLevel; }
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PRBool GetImportance() const { return mImportance; }
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PRBool GetCheckForImportantRules() const { return mCheckForImportantRules; }
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// We define the visited-relevant link to be the link that is the
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// nearest self-or-ancestor to the node being matched.
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enum VisitedHandlingType {
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// Do rule matching as though all links are unvisited.
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eRelevantLinkUnvisited,
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// Do rule matching as though the relevant link is visited and all
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// other links are unvisited.
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eRelevantLinkVisited,
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// Do rule matching as though a rule should match if it would match
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// given any set of visitedness states. (used by users other than
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// nsRuleWalker)
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eLinksVisitedOrUnvisited
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};
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private:
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nsRuleNode* mCurrent; // Our current position. Never null.
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nsRuleNode* mRoot; // The root of the tree we're walking.
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PRUint8 mLevel; // an nsStyleSet::sheetType
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PRPackedBool mImportance;
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PRPackedBool mCheckForImportantRules; // If true, check for important rules as
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// we walk and set to false if we find
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// one.
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public:
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nsRuleWalker(nsRuleNode* aRoot)
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: mCurrent(aRoot)
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, mRoot(aRoot)
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{
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NS_ASSERTION(mCurrent, "Caller screwed up and gave us null node");
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MOZ_COUNT_CTOR(nsRuleWalker);
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}
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~nsRuleWalker() { MOZ_COUNT_DTOR(nsRuleWalker); }
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};
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#endif /* !defined(nsRuleWalker_h_) */
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