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grep.cpp

//
// grep.cpp
//
// $Id: //poco/1.2/Foundation/samples/grep/src/grep.cpp#1 $
//
// This sample demonstrates the RegularExpression class.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


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


using Poco::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;
}

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