DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Untracked file

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230
/* -*- 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.org 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):
 *
 * 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 ***** */

/*
 * internal abstract interface for containers (roughly origins within
 * the CSS cascade) that provide style rules matching an element or
 * pseudo-element
 */

#ifndef nsIStyleRuleProcessor_h___
#define nsIStyleRuleProcessor_h___

#include <stdio.h>

#include "nsISupports.h"
#include "nsPresContext.h" // for nsCompatability
#include "nsILinkHandler.h"
#include "nsString.h"
#include "nsChangeHint.h"

class nsIStyleSheet;
class nsPresContext;
class nsIContent;
class nsIAtom;
class nsICSSPseudoComparator;
class nsRuleWalker;
class nsAttrValue;

// The implementation of the constructor and destructor are currently in
// nsCSSRuleProcessor.cpp.

struct RuleProcessorData {
  RuleProcessorData(nsPresContext* aPresContext,
                    nsIContent* aContent, 
                    nsRuleWalker* aRuleWalker,
                    nsCompatibility* aCompat = nsnull);
  
  // NOTE: not |virtual|
  ~RuleProcessorData();

  void* operator new(size_t sz, nsPresContext* aContext) CPP_THROW_NEW {
    return aContext->AllocateFromShell(sz);
  }
  void Destroy(nsPresContext* aContext) {
    this->~RuleProcessorData();
    aContext->FreeToShell(sizeof(RuleProcessorData), this);
  }

  const nsString* GetLang();

  nsPresContext*   mPresContext;
  nsIContent*       mContent;       // weak ref
  nsIContent*       mParentContent; // if content, content->GetParent(); weak ref
  nsRuleWalker*     mRuleWalker; // Used to add rules to our results.
  nsIContent*       mScopedRoot;    // Root of scoped stylesheet (set and unset by the supplier of the scoped stylesheet
  
  nsIAtom*          mContentTag;    // if content, then content->GetTag()
  nsIAtom*          mContentID;     // if styled content, then weak reference to styledcontent->GetID()
  PRPackedBool      mIsHTMLContent; // if content, then does QI on HTMLContent, true or false
  PRPackedBool      mIsLink;        // if content, calls nsStyleUtil::IsHTMLLink or nsStyleUtil::IsLink
  PRPackedBool      mHasAttributes; // if content, content->GetAttrCount() > 0
  nsCompatibility   mCompatMode;    // Possibly remove use of this in SelectorMatches?
  nsLinkState       mLinkState;     // if a link, this is the state, otherwise unknown
  PRInt32           mEventState;    // if content, eventStateMgr->GetContentState()
  PRInt32           mNameSpaceID;   // if content, content->GetNameSapce()
  const nsAttrValue* mClasses;      // if styled content, styledcontent->GetClasses()
  // mPreviousSiblingData and mParentData are always RuleProcessorData
  // and never a derived class.  They are allocated lazily, when
  // selectors require matching of prior siblings or ancestors.
  RuleProcessorData* mPreviousSiblingData;
  RuleProcessorData* mParentData;

protected:
  nsAutoString *mLanguage; // NULL means we haven't found out the language yet
};

struct ElementRuleProcessorData : public RuleProcessorData {
  ElementRuleProcessorData(nsPresContext* aPresContext,
                           nsIContent* aContent, 
                           nsRuleWalker* aRuleWalker)
  : RuleProcessorData(aPresContext,aContent,aRuleWalker)
  {
    NS_PRECONDITION(aContent, "null pointer");
    NS_PRECONDITION(aRuleWalker, "null pointer");
  }
};

struct PseudoRuleProcessorData : public RuleProcessorData {
  PseudoRuleProcessorData(nsPresContext* aPresContext,
                          nsIContent* aParentContent,
                          nsIAtom* aPseudoTag,
                          nsICSSPseudoComparator* aComparator,
                          nsRuleWalker* aRuleWalker)
  : RuleProcessorData(aPresContext, aParentContent, aRuleWalker)
  {
    NS_PRECONDITION(aPseudoTag, "null pointer");
    NS_PRECONDITION(aRuleWalker, "null pointer");
    mPseudoTag = aPseudoTag;
    mComparator = aComparator;
  }

  nsIAtom*                 mPseudoTag;
  nsICSSPseudoComparator*  mComparator;
};

struct StateRuleProcessorData : public RuleProcessorData {
  StateRuleProcessorData(nsPresContext* aPresContext,
                         nsIContent* aContent,
                         PRInt32 aStateMask)
    : RuleProcessorData(aPresContext, aContent, nsnull),
      mStateMask(aStateMask)
  {
    NS_PRECONDITION(aContent, "null pointer");
  }
  const PRInt32 mStateMask; // |HasStateDependentStyle| for which state(s)?
                            //  Constants defined in nsIEventStateManager.h .
};

struct AttributeRuleProcessorData : public RuleProcessorData {
  AttributeRuleProcessorData(nsPresContext* aPresContext,
                             nsIContent* aContent,
                             nsIAtom* aAttribute,
                             PRInt32 aModType,
                             PRUint32 aStateMask)
    : RuleProcessorData(aPresContext, aContent, nsnull),
      mAttribute(aAttribute),
      mModType(aModType),
      mStateMask(aStateMask)
  {
    NS_PRECONDITION(aContent, "null pointer");
  }
  nsIAtom* mAttribute; // |HasAttributeDependentStyle| for which attribute?
  PRInt32 mModType;    // The type of modification (see nsIDOMMutationEvent).
  PRUint32 mStateMask; // The states that changed with the attr change.
};


// IID for the nsIStyleRuleProcessor interface {015575fe-7b6c-11d3-ba05-001083023c2b}
#define NS_ISTYLE_RULE_PROCESSOR_IID     \
{0x015575fe, 0x7b6c, 0x11d3, {0xba, 0x05, 0x00, 0x10, 0x83, 0x02, 0x3c, 0x2b}}

/* The style rule processor interface is a mechanism to separate the matching
 * of style rules from style sheet instances.
 * Simple style sheets can and will act as their own processor. 
 * Sheets where rule ordering interlaces between multiple sheets, will need to 
 * share a single rule processor between them (CSS sheets do this for cascading order)
 *
 * @see nsIStyleRule (for significantly more detailed comments)
 */
class nsIStyleRuleProcessor : public nsISupports {
public:
  NS_DECLARE_STATIC_IID_ACCESSOR(NS_ISTYLE_RULE_PROCESSOR_IID)

  // Shorthand for:
  //  nsCOMArray<nsIStyleRuleProcessor>::nsCOMArrayEnumFunc
  typedef PRBool (* PR_CALLBACK EnumFunc)(nsIStyleRuleProcessor*, void*);

  /**
   * Find the |nsIStyleRule|s matching the given content node and
   * position the given |nsRuleWalker| at the |nsRuleNode| in the rule
   * tree representing that ordered list of rules (with higher
   * precedence being farther from the root of the lexicographic tree).
   */
  NS_IMETHOD RulesMatching(ElementRuleProcessorData* aData) = 0;

  /**
   * Just like the previous |RulesMatching|, except for a given content
   * node <em>and pseudo-element</em>.
   */
  NS_IMETHOD RulesMatching(PseudoRuleProcessorData* aData) = 0;

  /**
   * Return how (as described by nsReStyleHint) style can depend on a
   * change of the given content state on the given content node.  This
   * test is used for optimization only, and may err on the side of
   * reporting more dependencies than really exist.
   *
   * Event states are defined in nsIEventStateManager.h.
   */
  NS_IMETHOD HasStateDependentStyle(StateRuleProcessorData* aData,
                                    nsReStyleHint* aResult) = 0;

  /**
   * Return how (as described by nsReStyleHint) style can depend on the
   * presence or value of the given attribute for the given content
   * node.  This test is used for optimization only, and may err on the
   * side of reporting more dependencies than really exist.
   */
  NS_IMETHOD HasAttributeDependentStyle(AttributeRuleProcessorData* aData,
                                        nsReStyleHint* aResult) = 0;
};

NS_DEFINE_STATIC_IID_ACCESSOR(nsIStyleRuleProcessor,
                              NS_ISTYLE_RULE_PROCESSOR_IID)

#endif /* nsIStyleRuleProcessor_h___ */