presage  0.8.7
contextChangeDetector.h
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00001 
00002 /******************************************************
00003  *  Presage, an extensible predictive text entry system
00004  *  ---------------------------------------------------
00005  *
00006  *  Copyright (C) 2008  Matteo Vescovi <matteo.vescovi@yahoo.co.uk>
00007 
00008     This program is free software; you can redistribute it and/or modify
00009     it under the terms of the GNU General Public License as published by
00010     the Free Software Foundation; either version 2 of the License, or
00011     (at your option) any later version.
00012 
00013     This program is distributed in the hope that it will be useful,
00014     but WITHOUT ANY WARRANTY; without even the implied warranty of
00015     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00016     GNU General Public License for more details.
00017 
00018     You should have received a copy of the GNU General Public License along
00019     with this program; if not, write to the Free Software Foundation, Inc.,
00020     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
00021                                                                              *
00022                                                                 **********(*)*/
00023 
00024 
00025 #ifndef PRESAGE_CONTEXTCHANGEDETECTOR
00026 #define PRESAGE_CONTEXTCHANGEDETECTOR
00027 
00028 #ifdef HAVE_CONFIG_H
00029 #include "config.h"
00030 #endif
00031 
00032 #include <string>
00033 
00034 #include "../configuration.h"
00035 
00036 class ContextChangeDetector {
00037 public:
00038     ContextChangeDetector(const std::string,
00039                           const std::string,
00040                           const std::string,
00041                           const std::string);
00042     ~ContextChangeDetector();
00043 
00044     bool context_change(const std::string& past_stream) const;
00045     std::string change(const std::string& past_stream) const;
00046 
00047     std::string get_sliding_window() const;
00048 
00049     void set_sliding_window_size(const std::string& str);
00050     void update_sliding_window(const std::string& str);
00051     
00052 private:
00053     bool context_change_helper(const std::string& str1, const std::string& str2) const;
00054 
00055     static const std::string::size_type DEFAULT_SLIDING_WINDOW_SIZE;
00056     std::string::size_type              SLIDING_WINDOW_SIZE;
00057     std::string                         sliding_window;
00058 
00059     const std::string wordChars;
00060     const std::string separatorChars;
00061     const std::string blankspaceChars;
00062     const std::string controlChars;
00063 
00064 };
00065 
00066 #endif // PRESAGE_CONTEXTCHANGEDETECTOR