presage 0.9.1
contextTracker.h
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1
2/******************************************************
3 * Presage, an extensible predictive text entry system
4 * ---------------------------------------------------
5 *
6 * Copyright (C) 2008 Matteo Vescovi <matteo.vescovi@yahoo.co.uk>
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License along
19 with this program; if not, write to the Free Software Foundation, Inc.,
20 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 *
22 **********(*)*/
23
24
25#ifndef PRESAGE_CONTEXTTRACKER
26#define PRESAGE_CONTEXTTRACKER
27
28#ifdef HAVE_CONFIG_H
29#include "config.h"
30#endif
31
32#include <iostream>
33#include <sstream>
34#include <string>
35#include <vector>
36#include <assert.h>
37
39
41#include "../charsets.h"
42#include "../configuration.h"
43#include "../logger.h"
44#include "../dispatcher.h"
45
47
49
155class ContextTracker : public Observer {
156public:
160 const char[]=DEFAULT_WORD_CHARS,
161 const char[]=DEFAULT_SEPARATOR_CHARS,
162 const char[]=DEFAULT_BLANKSPACE_CHARS,
163 const char[]=DEFAULT_CONTROL_CHARS );
165
167
168 bool contextChange();
169
170 std::string getPrefix() const;
171 std::string getToken (const int) const;
172
173 std::string getExtraTokenToLearn(const int index,
174 const std::vector<std::string>& change) const;
175
176 std::string getFutureStream() const;
177 std::string getPastStream () const;
178
179 bool isCompletionValid(const std::string&) const;
180
181 //eliminate after testing phase
182 std::string getWordChars() const;
183 std::string getSeparatorChars() const;
184 std::string getBlankspaceChars() const;
185 std::string getControlChars() const;
186
187 std::string toString() const;
188
189 void update();
190
198 void learn(const std::string& text) const;
199
200 virtual void update (const Observable* variable);
201
202 void set_logger (const std::string& value);
203 void set_sliding_window_size (const std::string& value);
204 void set_lowercase_mode (const std::string& value);
205 void set_online_learning (const std::string& value);
206
207 static const char* LOGGER;
208 static const char* SLIDING_WINDOW_SIZE;
209 static const char* LOWERCASE_MODE;
210 static const char* ONLINE_LEARNING;
211
212private:
213 std::string wordChars;
214 std::string separatorChars;
215 std::string blankspaceChars;
216 std::string controlChars;
217
220
221 // REVISIT: this was removed since a tokenizer is created with
222 // each method invocation that needs it
223 //ReverseTokenizer tokenizer;
224
225 // utility functions
226 bool isWordChar (const char) const;
227 bool isSeparatorChar (const char) const;
228 bool isControlChar (const char) const;
229 bool isBlankspaceChar(const char) const;
230
235
237};
238
239#endif // PRESAGE_CONTEXTTRACKER
const char DEFAULT_SEPARATOR_CHARS[]
Definition charsets.h:176
const char DEFAULT_CONTROL_CHARS[]
Definition charsets.h:220
const char DEFAULT_BLANKSPACE_CHARS[]
Definition charsets.h:211
const char DEFAULT_WORD_CHARS[]
Definition charsets.h:45
void set_logger(const std::string &value)
static const char * LOWERCASE_MODE
std::string blankspaceChars
std::string getExtraTokenToLearn(const int index, const std::vector< std::string > &change) const
bool isControlChar(const char) const
static const char * LOGGER
bool isSeparatorChar(const char) const
std::string getControlChars() const
ContextTracker(Configuration *config, PredictorRegistry *predictorRegistry, PresageCallback *callback, const char[]=DEFAULT_WORD_CHARS, const char[]=DEFAULT_SEPARATOR_CHARS, const char[]=DEFAULT_BLANKSPACE_CHARS, const char[]=DEFAULT_CONTROL_CHARS)
std::string getPastStream() const
Logger< char > logger
static const char * SLIDING_WINDOW_SIZE
std::string controlChars
void set_online_learning(const std::string &value)
std::string toString() const
bool isCompletionValid(const std::string &) const
std::string getWordChars() const
bool isWordChar(const char) const
static const char * ONLINE_LEARNING
std::string getBlankspaceChars() const
const PresageCallback * callback(const PresageCallback *callback)
std::string separatorChars
ContextChangeDetector * contextChangeDetector
std::string getSeparatorChars() const
void set_sliding_window_size(const std::string &value)
bool isBlankspaceChar(const char) const
std::string getToken(const int) const
std::string getPrefix() const
PredictorRegistry * predictorRegistry
const PresageCallback * context_tracker_callback
void set_lowercase_mode(const std::string &value)
void learn(const std::string &text) const
Learn from text.
Dispatcher< ContextTracker > dispatcher
std::string getFutureStream() const
std::string wordChars
Observer()
Definition observer.h:40
std::string config