LCOV - code coverage report
Current view: directory - content/base/src - nsAttrAndChildArray.h (source / functions) Found Hit Coverage
Test: app.info Lines: 27 25 92.6 %
Date: 2012-06-02 Functions: 11 10 90.9 %

       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                 :  * IBM Corporation.
      19                 :  * Portions created by the Initial Developer are Copyright (C) 2003
      20                 :  * IBM Corporation. All Rights Reserved.
      21                 :  *
      22                 :  * Contributor(s):
      23                 :  *   IBM Corporation
      24                 :  *
      25                 :  * Alternatively, the contents of this file may be used under the terms of
      26                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      27                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      28                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      29                 :  * of those above. If you wish to allow use of your version of this file only
      30                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      31                 :  * use your version of this file under the terms of the MPL, indicate your
      32                 :  * decision by deleting the provisions above and replace them with the notice
      33                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      34                 :  * the provisions above, a recipient may use your version of this file under
      35                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      36                 :  *
      37                 :  * ***** END LICENSE BLOCK ***** */
      38                 : 
      39                 : /*
      40                 :  * Storage of the children and attributes of a DOM node; storage for
      41                 :  * the two is unified to minimize footprint.
      42                 :  */
      43                 : 
      44                 : #ifndef nsAttrAndChildArray_h___
      45                 : #define nsAttrAndChildArray_h___
      46                 : 
      47                 : #include "mozilla/Attributes.h"
      48                 : 
      49                 : #include "nscore.h"
      50                 : #include "nsAttrName.h"
      51                 : #include "nsAttrValue.h"
      52                 : 
      53                 : class nsINode;
      54                 : class nsIContent;
      55                 : class nsMappedAttributes;
      56                 : class nsHTMLStyleSheet;
      57                 : class nsRuleWalker;
      58                 : class nsMappedAttributeElement;
      59                 : 
      60                 : #define ATTRCHILD_ARRAY_GROWSIZE 8
      61                 : #define ATTRCHILD_ARRAY_LINEAR_THRESHOLD 32
      62                 : 
      63                 : #define ATTRCHILD_ARRAY_ATTR_SLOTS_BITS 10
      64                 : 
      65                 : #define ATTRCHILD_ARRAY_MAX_ATTR_COUNT \
      66                 :     ((1 << ATTRCHILD_ARRAY_ATTR_SLOTS_BITS) - 1)
      67                 : 
      68                 : #define ATTRCHILD_ARRAY_MAX_CHILD_COUNT \
      69                 :     (~PRUint32(0) >> ATTRCHILD_ARRAY_ATTR_SLOTS_BITS)
      70                 : 
      71                 : #define ATTRCHILD_ARRAY_ATTR_SLOTS_COUNT_MASK \
      72                 :     ((1 << ATTRCHILD_ARRAY_ATTR_SLOTS_BITS) - 1)
      73                 : 
      74                 : 
      75                 : #define ATTRSIZE (sizeof(InternalAttr) / sizeof(void*))
      76                 : 
      77                 : class nsAttrAndChildArray
      78                 : {
      79                 : public:
      80                 :   nsAttrAndChildArray();
      81                 :   ~nsAttrAndChildArray();
      82                 : 
      83         1506121 :   PRUint32 ChildCount() const
      84                 :   {
      85         1506121 :     return mImpl ? (mImpl->mAttrAndChildCount >> ATTRCHILD_ARRAY_ATTR_SLOTS_BITS) : 0;
      86                 :   }
      87          402455 :   nsIContent* ChildAt(PRUint32 aPos) const
      88                 :   {
      89          402455 :     NS_ASSERTION(aPos < ChildCount(), "out-of-bounds access in nsAttrAndChildArray");
      90          402455 :     return reinterpret_cast<nsIContent*>(mImpl->mBuffer[AttrSlotsSize() + aPos]);
      91                 :   }
      92                 :   nsIContent* GetSafeChildAt(PRUint32 aPos) const;
      93                 :   nsIContent * const * GetChildArray(PRUint32* aChildCount) const;
      94                 :   nsresult AppendChild(nsIContent* aChild)
      95                 :   {
      96                 :     return InsertChildAt(aChild, ChildCount());
      97                 :   }
      98                 :   nsresult InsertChildAt(nsIContent* aChild, PRUint32 aPos);
      99                 :   void RemoveChildAt(PRUint32 aPos);
     100                 :   // Like RemoveChildAt but hands the reference to the child being
     101                 :   // removed back to the caller instead of just releasing it.
     102                 :   already_AddRefed<nsIContent> TakeChildAt(PRUint32 aPos);
     103                 :   PRInt32 IndexOfChild(nsINode* aPossibleChild) const;
     104                 : 
     105                 :   PRUint32 AttrCount() const;
     106                 :   const nsAttrValue* GetAttr(nsIAtom* aLocalName, PRInt32 aNamespaceID = kNameSpaceID_None) const;
     107                 :   const nsAttrValue* AttrAt(PRUint32 aPos) const;
     108                 :   nsresult SetAndTakeAttr(nsIAtom* aLocalName, nsAttrValue& aValue);
     109                 :   nsresult SetAndTakeAttr(nsINodeInfo* aName, nsAttrValue& aValue);
     110                 : 
     111                 :   // Remove the attr at position aPos.  The value of the attr is placed in
     112                 :   // aValue; any value that was already in aValue is destroyed.
     113                 :   nsresult RemoveAttrAt(PRUint32 aPos, nsAttrValue& aValue);
     114                 : 
     115                 :   // Returns attribute name at given position, *not* out-of-bounds safe
     116                 :   const nsAttrName* AttrNameAt(PRUint32 aPos) const;
     117                 : 
     118                 :   // Returns attribute name at given position or null if aPos is out-of-bounds
     119                 :   const nsAttrName* GetSafeAttrNameAt(PRUint32 aPos) const;
     120                 : 
     121                 :   const nsAttrName* GetExistingAttrNameFromQName(const nsAString& aName) const;
     122                 :   PRInt32 IndexOfAttr(nsIAtom* aLocalName, PRInt32 aNamespaceID = kNameSpaceID_None) const;
     123                 : 
     124                 :   nsresult SetAndTakeMappedAttr(nsIAtom* aLocalName, nsAttrValue& aValue,
     125                 :                                 nsMappedAttributeElement* aContent,
     126                 :                                 nsHTMLStyleSheet* aSheet);
     127                 :   nsresult SetMappedAttrStyleSheet(nsHTMLStyleSheet* aSheet);
     128                 :   void WalkMappedAttributeStyleRules(nsRuleWalker* aRuleWalker);
     129                 : 
     130                 :   void Compact();
     131                 : 
     132           11455 :   bool CanFitMoreAttrs() const
     133                 :   {
     134           11455 :     return AttrSlotCount() < ATTRCHILD_ARRAY_MAX_ATTR_COUNT ||
     135           11455 :            !AttrSlotIsTaken(ATTRCHILD_ARRAY_MAX_ATTR_COUNT - 1);
     136                 :   }
     137                 : 
     138                 :   size_t SizeOfExcludingThis(nsMallocSizeOfFun aMallocSizeOf) const;
     139               0 :   bool HasMappedAttrs() const
     140                 :   {
     141               0 :     return MappedAttrCount();
     142                 :   }
     143                 : 
     144                 : private:
     145                 :   nsAttrAndChildArray(const nsAttrAndChildArray& aOther) MOZ_DELETE;
     146                 :   nsAttrAndChildArray& operator=(const nsAttrAndChildArray& aOther) MOZ_DELETE;
     147                 : 
     148                 :   void Clear();
     149                 : 
     150                 :   PRUint32 NonMappedAttrCount() const;
     151                 :   PRUint32 MappedAttrCount() const;
     152                 : 
     153                 :   nsresult GetModifiableMapped(nsMappedAttributeElement* aContent,
     154                 :                                nsHTMLStyleSheet* aSheet,
     155                 :                                bool aWillAddAttr,
     156                 :                                nsMappedAttributes** aModifiable);
     157                 :   nsresult MakeMappedUnique(nsMappedAttributes* aAttributes);
     158                 : 
     159          627043 :   PRUint32 AttrSlotsSize() const
     160                 :   {
     161          627043 :     return AttrSlotCount() * ATTRSIZE;
     162                 :   }
     163                 : 
     164          906308 :   PRUint32 AttrSlotCount() const
     165                 :   {
     166          906308 :     return mImpl ? mImpl->mAttrAndChildCount & ATTRCHILD_ARRAY_ATTR_SLOTS_COUNT_MASK : 0;
     167                 :   }
     168                 : 
     169          106617 :   bool AttrSlotIsTaken(PRUint32 aSlot) const
     170                 :   {
     171          106617 :     NS_PRECONDITION(aSlot < AttrSlotCount(), "out-of-bounds");
     172          106617 :     return mImpl->mBuffer[aSlot * ATTRSIZE];
     173                 :   }
     174                 : 
     175          223910 :   void SetChildCount(PRUint32 aCount)
     176                 :   {
     177                 :     mImpl->mAttrAndChildCount = 
     178                 :         (mImpl->mAttrAndChildCount & ATTRCHILD_ARRAY_ATTR_SLOTS_COUNT_MASK) |
     179          223910 :         (aCount << ATTRCHILD_ARRAY_ATTR_SLOTS_BITS);
     180          223910 :   }
     181                 : 
     182           11448 :   void SetAttrSlotCount(PRUint32 aCount)
     183                 :   {
     184                 :     mImpl->mAttrAndChildCount =
     185                 :         (mImpl->mAttrAndChildCount & ~ATTRCHILD_ARRAY_ATTR_SLOTS_COUNT_MASK) |
     186           11448 :         aCount;
     187           11448 :   }
     188                 : 
     189           77412 :   void SetAttrSlotAndChildCount(PRUint32 aSlotCount, PRUint32 aChildCount)
     190                 :   {
     191                 :     mImpl->mAttrAndChildCount = aSlotCount |
     192           77412 :       (aChildCount << ATTRCHILD_ARRAY_ATTR_SLOTS_BITS);
     193           77412 :   }
     194                 : 
     195                 :   bool GrowBy(PRUint32 aGrowSize);
     196                 :   bool AddAttrSlot();
     197                 : 
     198                 :   /**
     199                 :    * Set *aPos to aChild and update sibling pointers as needed.  aIndex is the
     200                 :    * index at which aChild is actually being inserted.  aChildCount is the
     201                 :    * number of kids we had before the insertion.
     202                 :    */
     203                 :   inline void SetChildAtPos(void** aPos, nsIContent* aChild, PRUint32 aIndex,
     204                 :                             PRUint32 aChildCount);
     205                 : 
     206                 :   struct InternalAttr
     207           11446 :   {
     208                 :     nsAttrName mName;
     209                 :     nsAttrValue mValue;
     210                 :   };
     211                 : 
     212                 :   struct Impl {
     213                 :     PRUint32 mAttrAndChildCount;
     214                 :     PRUint32 mBufferSize;
     215                 :     nsMappedAttributes* mMappedAttrs;
     216                 :     void* mBuffer[1];
     217                 :   };
     218                 : 
     219                 :   Impl* mImpl;
     220                 : };
     221                 : 
     222                 : #endif

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