/*============================================================================= 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 <boost/spirit/core.hpp> #include <boost/spirit/attribute.hpp> #include <iostream> #include <string> //////////////////////////////////////////////////////////////////////////// using namespace std; using namespace boost::spirit; using namespace phoenix; //////////////////////////////////////////////////////////////////////////// // // HTML/XML like tag matching grammar // //////////////////////////////////////////////////////////////////////////// struct tags_closure : boost::spirit::closure<tags_closure, string> { member1 tag; }; struct tags : public grammar<tags> { template <typename ScannerT> 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_<string>(arg1, arg2) ] ] >> '>'; end_tag = "</" >> f_str_p(element.tag) >> '>'; } rule<ScannerT, tags_closure::context_t> element; rule<ScannerT> start_tag, end_tag; rule<ScannerT, tags_closure::context_t> 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: <html><head></head><body></body></html>\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; }