author Boris Zbarsky <>
Thu, 10 Dec 2009 14:36:06 -0800
changeset 35539 732473bebf16066f0ee401a3de67ab6765f5751e
parent 35533 eb86d6432f02609e3f2e748103b5be2a1749a81e
child 35540 62e1d35ef5b4f3073b226aad6da3e5825881b92b
permissions -rw-r--r--
Bug 525608 part 4. Change pseudo-element probing and resolution to not use EnumerateTagRules. r=dbaron

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
// vim:cindent:tabstop=2:expandtab:shiftwidth=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
 * 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 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):
 *   L. David Baron <>
 * 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 ***** */

 * style rule processor for CSS style sheets, responsible for selector
 * matching and cascading

#ifndef nsCSSRuleProcessor_h_
#define nsCSSRuleProcessor_h_

#include "nsIStyleRuleProcessor.h"
#include "nsCSSStyleSheet.h"
#include "nsTArray.h"
#include "nsAutoPtr.h"
#include "nsCSSRules.h"

struct RuleCascadeData;
struct nsCSSSelectorList;

 * The CSS style rule processor provides a mechanism for sibling style
 * sheets to combine their rule processing in order to allow proper
 * cascading to happen.
 * CSS style rule processors keep a live reference on all style sheets
 * bound to them.  The CSS style sheets keep a weak reference to all the
 * processors that they are bound to (many to many).  The CSS style sheet
 * is told when the rule processor is going away (via DropRuleProcessor).

class nsCSSRuleProcessor: public nsIStyleRuleProcessor {
  nsCSSRuleProcessor(const nsCOMArray<nsICSSStyleSheet>& aSheets, 
                     PRUint8 aSheetType);
  virtual ~nsCSSRuleProcessor();


  nsresult ClearRuleCascades();

  static void Startup();
  static void FreeSystemMetrics();
  static PRBool HasSystemMetric(nsIAtom* aMetric);

   * Returns true if the given RuleProcessorData matches one of the
   * selectors in aSelectorList.  Note that this method will assume
   * the matching is not for styling purposes.
  static PRBool SelectorListMatches(RuleProcessorData& aData,
                                    nsCSSSelectorList* aSelectorList);

  // nsIStyleRuleProcessor
  NS_IMETHOD RulesMatching(ElementRuleProcessorData* aData);

  NS_IMETHOD RulesMatching(PseudoElementRuleProcessorData* aData);

  NS_IMETHOD RulesMatching(PseudoRuleProcessorData* aData);

  NS_IMETHOD HasStateDependentStyle(StateRuleProcessorData* aData,
                                    nsReStyleHint* aResult);

  virtual nsReStyleHint
    HasAttributeDependentStyle(AttributeRuleProcessorData* aData);

  NS_IMETHOD MediumFeaturesChanged(nsPresContext* aPresContext,
                                   PRBool* aRulesChanged);

  // Append all the currently-active font face rules to aArray.  Return
  // true for success and false for failure.
  PRBool AppendFontFaceRules(nsPresContext* aPresContext,
                             nsTArray<nsFontFaceRuleContainer>& aArray);

#ifdef DEBUG
  void AssertQuirksChangeOK() {
    NS_ASSERTION(!mRuleCascades, "can't toggle quirks style sheet without "
                                 "clearing rule cascades");

  static PRBool CascadeSheetEnumFunc(nsICSSStyleSheet* aSheet, void* aData);

  RuleCascadeData* GetRuleCascade(nsPresContext* aPresContext);
  void RefreshRuleCascade(nsPresContext* aPresContext);

  // The sheet order here is the same as in nsStyleSet::mSheets
  nsCOMArray<nsICSSStyleSheet> mSheets;

  // active first, then cached (most recent first)
  RuleCascadeData* mRuleCascades;

  // The last pres context for which GetRuleCascades was called.
  nsPresContext *mLastPresContext;
  // type of stylesheet using this processor
  PRUint8 mSheetType;  // == nsStyleSet::sheetType

#endif /* nsCSSRuleProcessor_h_ */