grep.cpp

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//
// grep.cpp
//
// $Id: //poco/Main/Foundation/samples/grep/src/grep.cpp#5 $
//
// This sample demonstrates the RegularExpression class.
//
// Copyright (c) 2004-2005, Guenter Obiltschnig/Applied Informatics.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// 3. Redistributions in any form must be accompanied by information on
//    how to obtain complete source code for this software and any
//    accompanying software that uses this software.  The source code
//    must either be included in the distribution or be available for no
//    more than the cost of distribution plus a nominal fee, and must be
//    freely redistributable under reasonable conditions.  For an
//    executable file, complete source code means the source code for all
//    modules it contains.  It does not include source code for modules or
//    files that typically accompany the major components of the operating
//    system on which the executable file runs.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//


#include "Foundation/RegularExpression.h"
#include <iostream>


using Foundation::RegularExpression;


int main(int argc, char** argv)
{
	if (argc < 2)
	{
		std::cout << "usage: " << argv[0] << ": [-i] [-x] pattern" << std::endl;
		return 1;
	}
	
	std::string pattern;
	int options = 0;
	for (int i = 1; i < argc; ++i)
	{
		std::string arg(argv[i]);
		if (arg == "-i")
			options += RegularExpression::RE_CASELESS;
		else if (arg == "-x")
			options += RegularExpression::RE_EXTENDED;
		else
			pattern = arg;
	}
	
	RegularExpression re(pattern, options);
	
	int c = std::cin.get();
	while (c != -1)
	{
		std::string line;
		while (c != -1 && c != '\n')
		{
			line += (char) c;
			c = std::cin.get();
		}

		RegularExpression::Match mtch;
		if (re.match(line, mtch))
			std::cout << line << std::endl;

		if (c != -1) c = std::cin.get();
	}
	
	return 0;
}