src/TortoiseMerge/svninclude/SVNLineDiff.h

   1 // TortoiseMerge - a Diff/Patch program
   2
   3 // Copyright (C) 2006-2007 - TortoiseSVN
   4
   5 // This program is free software; you can redistribute it and/or
   6 // modify it under the terms of the GNU General Public License
   7 // as published by the Free Software Foundation; either version 2
   8 // of the License, or (at your option) any later version.
   9
  10 // This program is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14
  15 // You should have received a copy of the GNU General Public License
  16 // along with this program; if not, write to the Free Software Foundation,
  17 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 //
  19 #pragma once
  20 #include "svn_diff.h"
  21 #include "diff.h"
  22 #include "svn_pools.h"
  23
  24 /**
  25  * \ingroup TortoiseMerge
  26  * Handles diffs of single lines. Used for inline diffs.
  27  */
  28 class SVNLineDiff
  29 {
  30 public:
  31         SVNLineDiff();
  32         ~SVNLineDiff();
  33
  34         bool Diff(svn_diff_t** diff, LPCTSTR line1, int len1, LPCTSTR line2, int len2, bool bWordDiff);
  35         /** Checks if we really should show inline diffs.
  36          * Inline diffs are only useful if the two lines are not
  37          * completely different but at least a little bit similar.
  38          */
  39         static bool ShowInlineDiff(svn_diff_t* diff);
  40
  41         std::vector<std::wstring>       m_line1tokens;
  42         std::vector<std::wstring>       m_line2tokens;
  43 private:
  44
  45         apr_pool_t *            m_pool;
  46         apr_pool_t *            m_subpool;
  47         LPCTSTR                         m_line1;
  48         unsigned long           m_line1length;
  49         LPCTSTR                         m_line2;
  50         unsigned long           m_line2length;
  51         unsigned long           m_line1pos;
  52         unsigned long           m_line2pos;
  53
  54         bool                            m_bWordDiff;
  55
  56         static svn_error_t * datasource_open(void *baton, svn_diff_datasource_e datasource);
  57         static svn_error_t * datasource_close(void *baton, svn_diff_datasource_e datasource);
  58         static svn_error_t * next_token(apr_uint32_t * hash, void ** token, void * baton, svn_diff_datasource_e datasource);
  59         static svn_error_t * compare_token(void * baton, void * token1, void * token2, int * compare);
  60         static void discard_token(void * baton, void * token);
  61         static void discard_all_token(void *baton);
  62         static bool IsCharWhiteSpace(TCHAR c);
  63
  64         static apr_uint32_t Adler32(apr_uint32_t checksum, const WCHAR *data, apr_size_t len);
  65         static void ParseLineWords(
  66                 LPCTSTR line, unsigned long lineLength, std::vector<std::wstring>& tokens);
  67         static void ParseLineChars(
  68                 LPCTSTR line, unsigned long lineLength, std::vector<std::wstring>& tokens);
  69         static void NextTokenWords(
  70                 apr_uint32_t* hash, void** token, unsigned long& linePos, const std::vector<std::wstring>& tokens);
  71         static void NextTokenChars(
  72                 apr_uint32_t* hash, void** token, unsigned long& linePos, LPCTSTR line, unsigned long lineLength);
  73         static const svn_diff_fns_t SVNLineDiff_vtable;
  74 };