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