111 lines
3.5 KiB
C++
111 lines
3.5 KiB
C++
/*=============================================================================
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Copyright (c) 2002-2003 Hartmut Kaiser
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http://spirit.sourceforge.net/
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Use, modification and distribution is subject to the Boost Software
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License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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///////////////////////////////////////////////////////////////////////////////
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//
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// Demonstrate regular expression parser objects
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// See the "Regular Expression Parser" chapter in the User's Guide.
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//
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// This sample requires an installed version of the boost regex library
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// (http://www.boost.org) The sample was tested with boost V1.28.0
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//
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///////////////////////////////////////////////////////////////////////////////
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#include <string>
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#include <iostream>
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#include <boost/version.hpp>
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#include <boost/spirit/include/classic_core.hpp>
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///////////////////////////////////////////////////////////////////////////////
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//
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// The following header must be included, if regular expression support is
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// required for Spirit.
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//
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// The BOOST_SPIRIT_NO_REGEX_LIB PP constant should be defined, if you're
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// using the Boost.Regex library from one translation unit only. Otherwise
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// you have to link with the Boost.Regex library as defined in the related
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// documentation (see. http://www.boost.org).
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//
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// For Boost > V1.32.0 you'll always have to link against the Boost.Regex
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// libraries.
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//
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///////////////////////////////////////////////////////////////////////////////
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#if BOOST_VERSION <= 103200
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#define BOOST_SPIRIT_NO_REGEX_LIB
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#endif
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#include <boost/spirit/include/classic_regex.hpp>
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///////////////////////////////////////////////////////////////////////////////
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// used namespaces
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using namespace std;
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using namespace BOOST_SPIRIT_CLASSIC_NS;
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///////////////////////////////////////////////////////////////////////////////
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// main entry point
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int main()
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{
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const char *ptest = "123 E 456";
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const char *prx = "[1-9]+[[:space:]]*E[[:space:]]*";
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cout << "Parse " << ptest << " against regular expression: " << prx
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<< endl;
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// 1. direct use of rxlit<>
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rxstrlit<> regexpr(prx);
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parse_info<> result;
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string str;
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result = parse (ptest, regexpr[assign(str)]);
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if (result.hit)
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{
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cout << "Parsed regular expression successfully!" << endl;
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cout << "Matched (" << (int)result.length << ") characters: ";
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cout << "\"" << str << "\"" << endl;
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}
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else
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{
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cout << "Failed to parse regular expression!" << endl;
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}
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cout << endl;
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// 2. use of regex_p predefined parser object
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str.empty();
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result = parse (ptest, regex_p(prx)[assign(str)]);
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if (result.hit)
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{
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cout << "Parsed regular expression successfully!" << endl;
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cout << "Matched (" << (int)result.length << ") characters: ";
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cout << "\"" << str << "\"" << endl;
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}
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else
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{
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cout << "Failed to parse regular expression!" << endl;
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}
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cout << endl;
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// 3. test the regression reported by Grzegorz Marcin Koczyk (gkoczyk@echostar.pl)
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string str1;
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string str2;
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char const *ptest1 = "Token whatever \nToken";
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result = parse(ptest1, rxstrlit<>("Token")[assign(str1)]
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>> rxstrlit<>("Token")[assign(str2)]);
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if (!result.hit)
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cout << "Parsed regular expression successfully!" << endl;
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else
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cout << "Failed to parse regular expression!" << endl;
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cout << endl;
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return 0;
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}
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