| /*============================================================================= |
| 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/include/classic_core.hpp> |
| #include <boost/spirit/include/classic_attribute.hpp> |
| #include <iostream> |
| #include <string> |
| |
| //////////////////////////////////////////////////////////////////////////// |
| 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<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; |
| } |
| |
| |
