src/regexes.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2008-2012 by Andrzej Rybczak                            *
   3  *   electricityispower@gmail.com                                          *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (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                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.              *
  19  ***************************************************************************/
  20
  21 #include <cassert>
  22 #include "regexes.h"
  23
  24 Regex::Regex() : m_cflags(0), m_compiled(false) { }
  25
  26 Regex::Regex(const std::string &regex_, int cflags)
  27 : m_regex(regex_), m_cflags(cflags), m_compiled(false)
  28 {
  29         compile();
  30 }
  31
  32 Regex::Regex (const Regex &rhs)
  33 : m_regex(rhs.m_regex), m_cflags(rhs.m_cflags), m_compiled(false)
  34 {
  35         if (rhs.m_compiled)
  36                 compile();
  37 }
  38
  39 Regex::~Regex()
  40 {
  41         if (m_compiled)
  42                 regfree(&m_rx);
  43 }
  44
  45 const std::string &Regex::regex() const
  46 {
  47         return m_regex;
  48 }
  49
  50 const std::string &Regex::error() const
  51 {
  52         return m_error;
  53 }
  54
  55 bool Regex::compile()
  56 {
  57         if (m_compiled)
  58         {
  59                 m_error.clear();
  60                 regfree(&m_rx);
  61         }
  62         int comp_res = regcomp(&m_rx, m_regex.c_str(), m_cflags);
  63         bool result = true;
  64         if (comp_res != 0)
  65         {
  66                 char buf[256];
  67                 regerror(comp_res, &m_rx, buf, sizeof(buf));
  68                 m_error = buf;
  69                 result = false;
  70         }
  71         m_compiled = result;
  72         return result;
  73 }
  74
  75 bool Regex::compile(const std::string &regex_, int cflags)
  76 {
  77         m_regex = regex_;
  78         m_cflags = cflags;
  79         return compile();
  80 }
  81
  82 bool Regex::match(const std::string &s) const
  83 {
  84         assert(m_compiled);
  85         return regexec(&m_rx, s.c_str(), 0, 0, 0) == 0;
  86 }
  87
  88 Regex &Regex::operator=(const Regex &rhs)
  89 {
  90         if (this == &rhs)
  91                 return *this;
  92         m_regex = rhs.m_regex;
  93         m_cflags = rhs.m_cflags;
  94         if (rhs.m_compiled)
  95                 compile();
  96         return *this;
  97 }