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/*
* Copyright (C) 1999-2009 Lorenzo Bettini, http://www.lorenzobettini.it
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "chartranslator.h"
#include <sstream>
using namespace std;
namespace srchilite {
CharTranslator::CharTranslator(PreFormatterPtr f) :
PreFormatter(f), counter(0), reg_exp(0), bol(true) {
}
CharTranslator::~CharTranslator() {
if (reg_exp)
delete reg_exp;
}
void CharTranslator::set_translation(const std::string &to_translate,
const std::string &translate_into) {
// here we only buffer the translation regular expression
ostringstream exp;
exp << (translation_exp.size() ? "|" : "") << "(" << to_translate << ")";
translation_exp += exp.str();
ostringstream format;
// the translation format corresponding to "to_translate"
format << "(?" << ++counter << translate_into << ")";
translation_format += format.str();
}
const string CharTranslator::doPreformat(const string &text) {
if (!translation_exp.size()) {
return text;
}
// we finally build the actual regular expression
if (!reg_exp)
reg_exp = new boost::regex(translation_exp);
boost::match_flag_type flags = boost::match_default | boost::format_all;
if (!bol)
flags |= boost::match_not_bol;
// if we're not at the beginning of the line, then we must not match the
// beginning of the string as the beginning of a line
std::ostringstream preformat_text(std::ios::out | std::ios::binary);
std::ostream_iterator<char, char> oi(preformat_text);
boost::regex_replace(oi, text.begin(), text.end(), *reg_exp,
translation_format, flags);
// keep track of the fact that we begin a new line
if (text.find('\n') != string::npos)
bol = true;
else
bol = false;
return preformat_text.str();
}
}
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