/*============================================================================= Copyright (c) 2002-2003 Joel de Guzman http://spirit.sourceforge.net/ Use, modification and distribution is subject to the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) =============================================================================*/ //////////////////////////////////////////////////////////////////////////// // // HTML/XML like tag matching grammar // Demonstrates phoenix and closures and parametric parsers // This is discussed in the "Closures" chapter in the Spirit User's Guide. // // [ JDG 6/30/2002 ] // //////////////////////////////////////////////////////////////////////////// #include #include #include #include //////////////////////////////////////////////////////////////////////////// using namespace std; using namespace BOOST_SPIRIT_CLASSIC_NS; using namespace phoenix; //////////////////////////////////////////////////////////////////////////// // // HTML/XML like tag matching grammar // //////////////////////////////////////////////////////////////////////////// struct tags_closure : BOOST_SPIRIT_CLASSIC_NS::closure { member1 tag; }; struct tags : public grammar { template struct definition { definition(tags const& /*self*/) { element = start_tag >> *element >> end_tag; start_tag = '<' >> lexeme_d [ (+alpha_p) [ // construct string from arg1 and arg2 lazily // and assign to element.tag element.tag = construct_(arg1, arg2) ] ] >> '>'; end_tag = "> f_str_p(element.tag) >> '>'; } rule element; rule start_tag, end_tag; rule const& start() const { return element; } }; }; //////////////////////////////////////////////////////////////////////////// // // Main program // //////////////////////////////////////////////////////////////////////////// int main() { cout << "/////////////////////////////////////////////////////////\n\n"; cout << "\t\tHTML/XML like tag matching parser demo \n\n"; cout << "/////////////////////////////////////////////////////////\n\n"; cout << "Type an HTML/XML like nested tag input...or [q or Q] to quit\n\n"; cout << "Example: \n\n"; tags p; // Our parser string str; while (getline(cin, str)) { if (str.empty() || str[0] == 'q' || str[0] == 'Q') break; parse_info<> info = parse(str.c_str(), p, space_p); if (info.full) { cout << "-------------------------\n"; cout << "Parsing succeeded\n"; cout << "-------------------------\n"; } else { cout << "-------------------------\n"; cout << "Parsing failed\n"; cout << "stopped at: \": " << info.stop << "\"\n"; cout << "-------------------------\n"; } } cout << "Bye... :-) \n\n"; return 0; }