1 /*
2 * Copyright (C) 1999-2009 Lorenzo Bettini, http://www.lorenzobettini.it
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 3 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17 *
18 */
19
20 #ifdef HAVE_CONFIG_H
21 #include "config.h"
22 #endif
23
24 #include "chartranslator.h"
25 #include <sstream>
26
27 using namespace std;
28
29 namespace srchilite {
30
CharTranslator(PreFormatterPtr f)31 CharTranslator::CharTranslator(PreFormatterPtr f) :
32 PreFormatter(f), counter(0), reg_exp(0), bol(true) {
33 }
34
~CharTranslator()35 CharTranslator::~CharTranslator() {
36 if (reg_exp)
37 delete reg_exp;
38 }
39
set_translation(const std::string & to_translate,const std::string & translate_into)40 void CharTranslator::set_translation(const std::string &to_translate,
41 const std::string &translate_into) {
42 // here we only buffer the translation regular expression
43 ostringstream exp;
44 exp << (translation_exp.size() ? "|" : "") << "(" << to_translate << ")";
45
46 translation_exp += exp.str();
47
48 ostringstream format;
49 // the translation format corresponding to "to_translate"
50 format << "(?" << ++counter << translate_into << ")";
51
52 translation_format += format.str();
53 }
54
doPreformat(const string & text)55 const string CharTranslator::doPreformat(const string &text) {
56 if (!translation_exp.size()) {
57 return text;
58 }
59
60 // we finally build the actual regular expression
61 if (!reg_exp)
62 reg_exp = new boost::regex(translation_exp);
63
64 boost::match_flag_type flags = boost::match_default | boost::format_all;
65 if (!bol)
66 flags |= boost::match_not_bol;
67 // if we're not at the beginning of the line, then we must not match the
68 // beginning of the string as the beginning of a line
69
70 std::ostringstream preformat_text(std::ios::out | std::ios::binary);
71 std::ostream_iterator<char, char> oi(preformat_text);
72 boost::regex_replace(oi, text.begin(), text.end(), *reg_exp,
73 translation_format, flags);
74
75 // keep track of the fact that we begin a new line
76 if (text.find('\n') != string::npos)
77 bol = true;
78 else
79 bol = false;
80
81 return preformat_text.str();
82 }
83
84 }
85