LCOV - code coverage report
Current view: directory - objdir/dist/include/mozilla - StringBuilder.h (source / functions) Found Hit Coverage
Test: app.info Lines: 25 0 0.0 %
Date: 2012-06-02 Functions: 6 0 0.0 %

       1                 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2                 : /* vim:set ts=4 sw=4 sts=4 et cindent: */
       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 code.
      17                 :  *
      18                 :  * The Initial Developer of the Original Code is the 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                 :  *  Jeff Muizelaar <jmuizelaar@mozilla.com>
      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                 : /* We would use std::max but MS makes it painful
      40                 : // windef.h defines min and max macros that we don't want
      41                 : // http://support.microsoft.com/kb/143208
      42                 : #ifdef _WIN32
      43                 : #define NOMINMAX
      44                 : #endif
      45                 : */
      46                 : 
      47                 : #include <stdlib.h>
      48                 : #include <string.h>
      49                 : #include "nsAlgorithm.h"
      50                 : 
      51                 : /* This is a standard string builder like ones in Java
      52                 :    or C#. It uses a doubling allocation strategy
      53                 :    to grow when out of capacity.
      54                 : 
      55                 :    This does not use nsTArray because nsTArray starts
      56                 :    growing by multiples of page size after it is the
      57                 :    size of one page. We want to keep doubling in size
      58                 :    so that we can continue to append at high speed even
      59                 :    for large strings.
      60                 : 
      61                 :    Eventually, this should be templated for wide characters.
      62                 : 
      63                 :  */
      64                 : 
      65                 : namespace mozilla {
      66                 : 
      67                 : class StringBuilder
      68                 : {
      69                 : public:
      70               0 :     StringBuilder() {
      71               0 :         mCapacity = 16;
      72               0 :         mLength = 0;
      73               0 :         mBuffer = static_cast<char*>(malloc(sizeof(char)*mCapacity));
      74               0 :         mBuffer[0] = '\0';
      75               0 :     }
      76                 : 
      77               0 :     void Append(const char *s) {
      78               0 :         size_t newLength = strlen(s);
      79                 : 
      80               0 :         EnsureCapacity(mLength + newLength+1);
      81                 : 
      82                 :         // copy the entire string including the null terminator
      83               0 :         memcpy(&mBuffer[mLength], s, newLength+1);
      84               0 :         mLength += newLength;
      85               0 :     }
      86                 : 
      87               0 :     char *Buffer() {
      88               0 :         return mBuffer;
      89                 :     }
      90                 : 
      91               0 :     size_t Length() {
      92               0 :         return mLength;
      93                 :     }
      94                 : 
      95               0 :     size_t EnsureCapacity(size_t capacity) {
      96               0 :         if (capacity > mCapacity) {
      97                 :             // make sure we at least double in size
      98               0 :             mCapacity = NS_MAX(capacity, mCapacity*2);
      99               0 :             mBuffer = static_cast<char*>(realloc(mBuffer, mCapacity));
     100               0 :             mCapacity = moz_malloc_usable_size(mBuffer);
     101                 :         }
     102               0 :         return mCapacity;
     103                 :     }
     104                 : 
     105               0 :     ~StringBuilder()
     106                 :     {
     107               0 :         free(mBuffer);
     108               0 :     }
     109                 : 
     110                 : private:
     111                 :     char *mBuffer;
     112                 :     size_t mLength; // the length of the contained string not including the null terminator
     113                 :     size_t mCapacity; // the total size of mBuffer
     114                 : };
     115                 : 
     116                 : }

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