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- /*=============================================================================
- 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;
- }
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