LCOV - code coverage report
Current view: directory - layout/style - nsNthIndexCache.h (source / functions) Found Hit Coverage
Test: app.info Lines: 3 0 0.0 %
Date: 2012-06-02 Functions: 3 0 0.0 %

       1                 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2                 : /* ***** BEGIN LICENSE BLOCK *****
       3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       4                 :  *
       5                 :  * The contents of this file are subject to the Mozilla Public License Version
       6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       7                 :  * the License. You may obtain a copy of the License at
       8                 :  * http://www.mozilla.org/MPL/
       9                 :  *
      10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      12                 :  * for the specific language governing rights and limitations under the
      13                 :  * License.
      14                 :  *
      15                 :  * The Original Code is Mozilla.org code.
      16                 :  *
      17                 :  * The Initial Developer of the Original Code is
      18                 :  * Mozilla Foundation.
      19                 :  * Portions created by the Initial Developer are Copyright (C) 2011
      20                 :  * the Initial Developer. All Rights Reserved.
      21                 :  *
      22                 :  * Contributor(s):
      23                 :  *    Boris Zbarsky <bzbarsky@mit.edu> (original author)
      24                 :  *    L. David Baron <dbaron@dbaron.org>
      25                 :  *
      26                 :  * Alternatively, the contents of this file may be used under the terms of
      27                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
      28                 :  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      29                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      30                 :  * of those above. If you wish to allow use of your version of this file only
      31                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      32                 :  * use your version of this file under the terms of the MPL, indicate your
      33                 :  * decision by deleting the provisions above and replace them with the notice
      34                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      35                 :  * the provisions above, a recipient may use your version of this file under
      36                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      37                 :  *
      38                 :  * ***** END LICENSE BLOCK ***** */
      39                 : #ifndef nsContentIndexCache_h__
      40                 : #define nsContentIndexCache_h__
      41                 : 
      42                 : #include "nscore.h"
      43                 : #include "js/HashTable.h"
      44                 : #include "mozilla/dom/Element.h"
      45                 : 
      46                 : /*
      47                 :  * A class that computes and caches the indices used for :nth-* pseudo-class
      48                 :  * matching.
      49                 :  */
      50                 : 
      51                 : class nsNthIndexCache {
      52                 : private:
      53                 :   typedef mozilla::dom::Element Element;
      54                 : 
      55                 : public:
      56                 :   /**
      57                 :    * Constructor and destructor out of line so that we don't try to
      58                 :    * instantiate the hashtable template all over the place.
      59                 :    */
      60                 :   nsNthIndexCache();
      61                 :   ~nsNthIndexCache();
      62                 : 
      63                 :   // Returns a 1-based index of the child in its parent.  If the child
      64                 :   // is not in its parent's child list (i.e., it is anonymous content),
      65                 :   // returns 0.
      66                 :   // If aCheckEdgeOnly is true, the function will return 1 if the result
      67                 :   // is 1, and something other than 1 (maybe or maybe not a valid
      68                 :   // result) otherwise.
      69                 :   // This must only be called on nodes which have a non-null parent.
      70                 :   PRInt32 GetNthIndex(Element* aChild, bool aIsOfType, bool aIsFromEnd,
      71                 :                       bool aCheckEdgeOnly);
      72                 : 
      73                 :   void Reset();
      74                 : 
      75                 : private:
      76                 :   /**
      77                 :    * Returns true if aSibling and aElement should be considered in the same
      78                 :    * list for nth-index purposes, taking aIsOfType into account.
      79                 :    */
      80                 :   inline bool SiblingMatchesElement(nsIContent* aSibling, Element* aElement,
      81                 :                                     bool aIsOfType);
      82                 : 
      83                 :   // This node's index for this cache.
      84                 :   // If -2, needs to be computed.
      85                 :   // If -1, needs to be computed but known not to be 1.
      86                 :   // If 0, the node is not at any index in its parent.
      87                 :   typedef PRInt32 CacheEntry;
      88                 : 
      89                 :   class SystemAllocPolicy {
      90                 :   public:
      91               0 :     void *malloc_(size_t bytes) { return ::malloc(bytes); }
      92                 :     void *realloc_(void *p, size_t bytes) { return ::realloc(p, bytes); }
      93               0 :     void free_(void *p) { ::free(p); }
      94               0 :     void reportAllocOverflow() const {}
      95                 :   };
      96                 : 
      97                 :   typedef js::HashMap<nsIContent*, CacheEntry, js::DefaultHasher<nsIContent*>,
      98                 :                       SystemAllocPolicy> Cache;
      99                 : 
     100                 :   /**
     101                 :    * Returns true if aResult has been set to the correct value for aChild and
     102                 :    * no more work needs to be done.  Returns false otherwise.
     103                 :    *
     104                 :    * aResult is an inout parameter.  The in value is the number of elements
     105                 :    * that are in the half-open range (aSibling, aChild] (so including aChild
     106                 :    * but not including aSibling) that match aChild.  The out value is the
     107                 :    * correct index for aChild if this function returns true and the number of
     108                 :    * elements in the closed range [aSibling, aChild] that match aChild
     109                 :    * otherwise.
     110                 :    */
     111                 :   inline bool IndexDeterminedFromPreviousSibling(nsIContent* aSibling,
     112                 :                                                  Element* aChild,
     113                 :                                                  bool aIsOfType,
     114                 :                                                  bool aIsFromEnd,
     115                 :                                                  const Cache& aCache,
     116                 :                                                  PRInt32& aResult);
     117                 : 
     118                 :   // Caches of indices for :nth-child(), :nth-last-child(),
     119                 :   // :nth-of-type(), :nth-last-of-type(), keyed by Element*.
     120                 :   //
     121                 :   // The first subscript is 0 for -child and 1 for -of-type, the second
     122                 :   // subscript is 0 for nth- and 1 for nth-last-.
     123                 :   Cache mCaches[2][2];
     124                 : };
     125                 : 
     126                 : #endif /* nsContentIndexCache_h__ */

Generated by: LCOV version 1.7