LCOV - code coverage report
Current view: directory - layout/base - nsChildIterator.h (source / functions) Found Hit Coverage
Test: app.info Lines: 58 0 0.0 %
Date: 2012-06-02 Functions: 13 0 0.0 %

       1                 : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2                 : // vim:cindent:ts=2:et:sw=2:
       3                 : /* ***** BEGIN LICENSE BLOCK *****
       4                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       5                 :  *
       6                 :  * The contents of this file are subject to the Mozilla Public License Version
       7                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       8                 :  * the License. You may obtain a copy of the License at
       9                 :  * http://www.mozilla.org/MPL/
      10                 :  *
      11                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      12                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      13                 :  * for the specific language governing rights and limitations under the
      14                 :  * License.
      15                 :  *
      16                 :  * The Original Code is mozilla.org code.
      17                 :  *
      18                 :  * The Initial Developer of the Original Code is
      19                 :  * Netscape Communications Corporation.
      20                 :  * Portions created by the Initial Developer are Copyright (C) 1998
      21                 :  * the Initial Developer. All Rights Reserved.
      22                 :  *
      23                 :  * Contributor(s):
      24                 :  *
      25                 :  * Alternatively, the contents of this file may be used under the terms of
      26                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
      27                 :  * or 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                 :  * used by nsCSSFrameConstructor to determine and iterate the child list
      41                 :  * used to construct frames (normal children or something from XBL)
      42                 :  */
      43                 : 
      44                 : #include "nsCOMPtr.h"
      45                 : #include "nsIContent.h"
      46                 : #include "nsINodeList.h"
      47                 : 
      48                 : /**
      49                 :  * Helper class for iterating children during frame construction.
      50                 :  * This class should always be used in lieu of the straight content
      51                 :  * node APIs, since it handles XBL-generated anonymous content as
      52                 :  * well.
      53                 :  */
      54                 : class NS_STACK_CLASS ChildIterator
      55                 : {
      56                 : protected:
      57                 :   nsIContent* mContent;
      58                 :   // If mNodes is non-null (so XBLInvolved() is true), mIndex is the
      59                 :   // index into mNodes for our current position.  Otherwise, mChild is
      60                 :   // our current child (which might be null if we're done iterating).
      61                 :   union {
      62                 :     PRUint32 mIndex;
      63                 :     nsIContent* mChild;
      64                 :   };
      65                 :   nsINodeList* mNodes;
      66                 : 
      67                 : public:
      68               0 :   ChildIterator()
      69               0 :     : mContent(nsnull), mChild(0), mNodes(nsnull) {}
      70                 : 
      71               0 :   ChildIterator(const ChildIterator& aOther)
      72                 :     : mContent(aOther.mContent),
      73               0 :       mNodes(aOther.mNodes) {
      74               0 :     if (XBLInvolved()) {
      75               0 :       mIndex = aOther.mIndex;
      76                 :     } else {
      77               0 :       mChild = aOther.mChild;
      78                 :     }
      79               0 :   }
      80                 : 
      81               0 :   ChildIterator& operator=(const ChildIterator& aOther) {
      82               0 :     mContent = aOther.mContent;
      83               0 :     mNodes = aOther.mNodes;
      84               0 :     if (XBLInvolved()) {
      85               0 :       mIndex = aOther.mIndex;
      86                 :     } else {
      87               0 :       mChild = aOther.mChild;
      88                 :     }
      89               0 :     return *this;
      90                 :   }
      91                 : 
      92               0 :   ChildIterator& operator++() {
      93               0 :     if (XBLInvolved()) {
      94               0 :       ++mIndex;
      95                 :     } else {
      96               0 :       NS_ASSERTION(mChild, "Walking off end of list?");
      97               0 :       mChild = mChild->GetNextSibling();
      98                 :     }
      99                 : 
     100               0 :     return *this;
     101                 :   }
     102                 : 
     103                 :   ChildIterator operator++(int) {
     104                 :     ChildIterator result(*this);
     105                 :     ++(*this);
     106                 :     return result;
     107                 :   }
     108                 : 
     109               0 :   ChildIterator& operator--() {
     110               0 :     if (XBLInvolved()) {
     111               0 :       --mIndex;
     112               0 :     } else if (mChild) {
     113               0 :       mChild = mChild->GetPreviousSibling();
     114               0 :       NS_ASSERTION(mChild, "Walking off beginning of list");
     115                 :     } else {
     116               0 :       mChild = mContent->GetLastChild();
     117                 :     }
     118               0 :     return *this;
     119                 :   }
     120                 : 
     121               0 :   ChildIterator operator--(int) {
     122               0 :     ChildIterator result(*this);
     123               0 :     --(*this);
     124                 :     return result;
     125                 :   }
     126                 : 
     127               0 :   nsIContent* get() const {
     128               0 :     if (XBLInvolved()) {
     129               0 :       return mNodes->GetNodeAt(mIndex);
     130                 :     }
     131                 : 
     132               0 :     return mChild;
     133                 :   }
     134                 : 
     135               0 :   nsIContent* operator*() const { return get(); }
     136                 : 
     137               0 :   bool operator==(const ChildIterator& aOther) const {
     138               0 :     if (XBLInvolved()) {
     139               0 :       return mContent == aOther.mContent && mIndex == aOther.mIndex;
     140                 :     }
     141                 : 
     142               0 :     return mContent == aOther.mContent && mChild == aOther.mChild;
     143                 :   }
     144                 : 
     145               0 :   bool operator!=(const ChildIterator& aOther) const {
     146               0 :     return !aOther.operator==(*this);
     147                 :   }
     148                 : 
     149               0 :   void seek(nsIContent* aContent) {
     150               0 :     if (XBLInvolved()) {
     151               0 :       PRInt32 index = mNodes->IndexOf(aContent);
     152                 :       // XXXbz I wish we could assert that index != -1, but it seems to not be
     153                 :       // the case in some XBL cases with filtered insertion points and no
     154                 :       // default insertion point.  I will now claim that XBL's management of
     155                 :       // its insertion points is broken in those cases, since it's returning an
     156                 :       // insertion parent for a node that doesn't actually have the node in its
     157                 :       // child list according to ChildIterator.  See bug 474324.
     158               0 :       if (index != -1) {
     159               0 :         mIndex = index;
     160                 :       } else {
     161                 :         // If aContent isn't going to get hit by this iterator, just seek to the
     162                 :         // end of the list for lack of anything better to do.
     163               0 :         mIndex = length();
     164                 :       }
     165               0 :     } else if (aContent->GetParent() == mContent) {
     166               0 :       mChild = aContent;
     167                 :     } else {
     168                 :       // XXXbz I wish we could assert this doesn't happen, but I think that's
     169                 :       // not necessarily the case when called from ContentInserted if
     170                 :       // first-letter frames are about.
     171               0 :       mChild = nsnull;
     172                 :     }
     173               0 :   }
     174                 : 
     175               0 :   bool XBLInvolved() const { return mNodes != nsnull; }
     176                 : 
     177                 :   /**
     178                 :    * Create a pair of ChildIterators for a content node. aFirst will
     179                 :    * point to the first child of aContent; aLast will point one past
     180                 :    * the last child of aContent.
     181                 :    */
     182                 :   static nsresult Init(nsIContent*    aContent,
     183                 :                        ChildIterator* aFirst,
     184                 :                        ChildIterator* aLast);
     185                 : 
     186                 : private:
     187               0 :   PRUint32 length() {
     188               0 :     NS_PRECONDITION(XBLInvolved(), "Don't call me");
     189                 :     PRUint32 l;
     190               0 :     mNodes->GetLength(&l);
     191               0 :     return l;
     192                 :   }
     193                 : };

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