LCOV - code coverage report
Current view: directory - layout/style - nsCSSPropertySet.h (source / functions) Found Hit Coverage
Test: app.info Lines: 32 8 25.0 %
Date: 2012-06-02 Functions: 10 3 30.0 %

       1                 : /* ***** BEGIN LICENSE BLOCK *****
       2                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       3                 :  *
       4                 :  * The contents of this file are subject to the Mozilla Public License Version
       5                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       6                 :  * the License. You may obtain a copy of the License at
       7                 :  * http://www.mozilla.org/MPL/
       8                 :  *
       9                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      10                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      11                 :  * for the specific language governing rights and limitations under the
      12                 :  * License.
      13                 :  *
      14                 :  * The Original Code is nsCSSDataBlock.h.
      15                 :  *
      16                 :  * The Initial Developer of the Original Code is L. David Baron.
      17                 :  * Portions created by the Initial Developer are Copyright (C) 2003
      18                 :  * the Initial Developer. All Rights Reserved.
      19                 :  *
      20                 :  * Contributor(s):
      21                 :  *   L. David Baron <dbaron@dbaron.org> (original author)
      22                 :  *
      23                 :  * Alternatively, the contents of this file may be used under the terms of
      24                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      25                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      26                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      27                 :  * of those above. If you wish to allow use of your version of this file only
      28                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      29                 :  * use your version of this file under the terms of the MPL, indicate your
      30                 :  * decision by deleting the provisions above and replace them with the notice
      31                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      32                 :  * the provisions above, a recipient may use your version of this file under
      33                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      34                 :  *
      35                 :  * ***** END LICENSE BLOCK ***** */
      36                 : 
      37                 : /* bit vectors for sets of CSS properties */
      38                 : 
      39                 : #ifndef nsCSSPropertySet_h__
      40                 : #define nsCSSPropertySet_h__
      41                 : 
      42                 : #include "mozilla/Util.h"
      43                 : 
      44                 : #include "nsCSSProperty.h"
      45                 : #include <limits.h> // for CHAR_BIT
      46                 : 
      47                 : /**
      48                 :  * nsCSSPropertySet maintains a set of non-shorthand CSS properties.  In
      49                 :  * other words, for each longhand CSS property we support, it has a bit
      50                 :  * for whether that property is in the set.
      51                 :  */
      52                 : class nsCSSPropertySet {
      53                 : public:
      54              48 :     nsCSSPropertySet() { Empty(); }
      55                 :     // auto-generated copy-constructor OK
      56                 : 
      57               0 :     void AssertInSetRange(nsCSSProperty aProperty) const {
      58               0 :         NS_ASSERTION(0 <= aProperty &&
      59                 :                      aProperty < eCSSProperty_COUNT_no_shorthands,
      60                 :                      "out of bounds");
      61               0 :     }
      62                 : 
      63                 :     // Conversion of aProperty to |size_t| after AssertInSetRange
      64                 :     // lets the compiler generate significantly tighter code.
      65                 : 
      66               0 :     void AddProperty(nsCSSProperty aProperty) {
      67               0 :         AssertInSetRange(aProperty);
      68               0 :         size_t p = aProperty;
      69                 :         mProperties[p / kBitsInChunk] |=
      70               0 :           property_set_type(1) << (p % kBitsInChunk);
      71               0 :     }
      72                 : 
      73               0 :     void RemoveProperty(nsCSSProperty aProperty) {
      74               0 :         AssertInSetRange(aProperty);
      75               0 :         size_t p = aProperty;
      76                 :         mProperties[p / kBitsInChunk] &=
      77               0 :             ~(property_set_type(1) << (p % kBitsInChunk));
      78               0 :     }
      79                 : 
      80               0 :     bool HasProperty(nsCSSProperty aProperty) const {
      81               0 :         AssertInSetRange(aProperty);
      82               0 :         size_t p = aProperty;
      83               0 :         return (mProperties[p / kBitsInChunk] &
      84               0 :                 (property_set_type(1) << (p % kBitsInChunk))) != 0;
      85                 :     }
      86                 : 
      87              48 :     void Empty() {
      88              48 :         memset(mProperties, 0, sizeof(mProperties));
      89              48 :     }
      90                 : 
      91             144 :     void AssertIsEmpty(const char* aText) const {
      92            1296 :         for (size_t i = 0; i < mozilla::ArrayLength(mProperties); ++i) {
      93            1152 :             NS_ASSERTION(mProperties[i] == 0, aText);
      94                 :         }
      95             144 :     }
      96                 : 
      97                 : private:
      98                 :     typedef unsigned long property_set_type;
      99                 : public:
     100                 :     // number of bits in |property_set_type|.
     101                 :     static const size_t kBitsInChunk = sizeof(property_set_type)*CHAR_BIT;
     102                 :     // number of |property_set_type|s in the set
     103                 :     static const size_t kChunkCount =
     104                 :         (eCSSProperty_COUNT_no_shorthands + kBitsInChunk - 1) / kBitsInChunk;
     105                 : 
     106                 :     /*
     107                 :      * For fast enumeration of all the bits that are set, callers can
     108                 :      * check each chunk against zero (since in normal cases few bits are
     109                 :      * likely to be set).
     110                 :      */
     111               0 :     bool HasPropertyInChunk(size_t aChunk) const {
     112               0 :         return mProperties[aChunk] != 0;
     113                 :     }
     114               0 :     bool HasPropertyAt(size_t aChunk, size_t aBit) const {
     115               0 :         return (mProperties[aChunk] & (property_set_type(1) << aBit)) != 0;
     116                 :     }
     117               0 :     static nsCSSProperty CSSPropertyAt(size_t aChunk, size_t aBit) {
     118               0 :         return nsCSSProperty(aChunk * kBitsInChunk + aBit);
     119                 :     }
     120                 : 
     121                 : private:
     122                 :     property_set_type mProperties[kChunkCount];
     123                 : };
     124                 : 
     125                 : #endif /* !defined(nsCSSPropertySet_h__) */

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