CeylanRegularExpression.cc

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/* 
 * Copyright (C) 2003-2009 Olivier Boudeville
 *
 * This file is part of the Ceylan library.
 *
 * The Ceylan library is free software: you can redistribute it and/or modify
 * it under the terms of either the GNU Lesser General Public License or
 * the GNU General Public License, as they are published by the Free Software
 * Foundation, either version 3 of these Licenses, or (at your option) 
 * any later version.
 *
 * The Ceylan library 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 Lesser General Public License and the GNU General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License and the GNU General Public License along with the Ceylan library.
 * If not, see <http://www.gnu.org/licenses/>.
 *
 * Author: Olivier Boudeville (olivier.boudeville@esperide.com)
 *
 */


#include "CeylanRegularExpression.h"

#include "CeylanStringUtils.h"       // for Ceylan::Latin1Char, StringSize


#ifdef CEYLAN_USES_CONFIG_H
#include "CeylanConfig.h"            // for CEYLAN_USES_REGEX
#endif // CEYLAN_USES_CONFIG_H


extern "C"
{

#ifdef CEYLAN_USES_REGEX_H
#include <regex.h>                   // for regex_t, regcomp, etc.
#endif // CEYLAN_USES_REGEX_H 

}


#include <sstream>
using std::stringstream ;

using std::string ;


using namespace Ceylan ;
using namespace Ceylan::Features ;



RegExp::RegExp( const string & toAnalyze ) :
    _toAnalyze( toAnalyze )
{

#if CEYLAN_USES_REGEX

    // Nothing special to do.
    
#else // CEYLAN_USES_REGEX

    throw FeatureNotAvailableException( "RegExp constructor: "
        "regular expression support feature not available" ) ;
        
#endif // CEYLAN_USES_REGEX

}



RegExp::~RegExp() throw()
{

}



bool RegExp::isXMLName() const
{

    return matches( "^([a-z]|[A-Z]|[_]|[:]{1,1})" ) ;
    
}



bool RegExp::matches( const string & pattern ) const
{

#if CEYLAN_USES_REGEX

    regex_t re ;

    ::regcomp( & re, pattern.c_str(), REG_EXTENDED | REG_NOSUB ) ;

    int status = ::regexec( & re, _toAnalyze.c_str(), 
        static_cast<StringSize>( 0 ), 0, 0 ) ;

    ::regfree( & re ) ;

    return ( status == 0 ) ;
    
#else // CEYLAN_USES_REGEX

    throw FeatureNotAvailableException( "RegExp::matches: "
        "regular expression support feature not available" ) ;

#endif // CEYLAN_USES_REGEX

}

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