98 lines
2.6 KiB
C++
98 lines
2.6 KiB
C++
/*=============================================================================
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Copyright (c) 2002-2003 Joel de Guzman
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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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// Boiler plate [ A template for writing your parser ]
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//
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// [ JDG 9/17/2002 ]
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//
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///////////////////////////////////////////////////////////////////////////////
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#include <boost/spirit/include/classic_core.hpp>
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#include <iostream>
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#include <string>
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///////////////////////////////////////////////////////////////////////////////
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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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//
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// Semantic actions
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//
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///////////////////////////////////////////////////////////////////////////////
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struct my_action
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{
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template <typename IteratorT>
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void operator()(IteratorT first, IteratorT last) const
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{
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string s(first, last);
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cout << "\tMy Action got: " << s << endl;
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}
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};
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///////////////////////////////////////////////////////////////////////////////
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//
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// My grammar
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//
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///////////////////////////////////////////////////////////////////////////////
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struct my_grammar : public grammar<my_grammar>
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{
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template <typename ScannerT>
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struct definition
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{
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definition(my_grammar const& self)
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{
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my_rule =
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*lexeme_d[(+graph_p)[my_action()]]
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;
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}
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rule<ScannerT> my_rule;
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rule<ScannerT> const&
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start() const { return my_rule; }
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};
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};
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///////////////////////////////////////////////////////////////////////////////
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//
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// Main program
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//
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///////////////////////////////////////////////////////////////////////////////
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int
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main()
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{
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cout << "/////////////////////////////////////////////////////////\n\n";
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cout << "\t\t A boiler-plate parser...\n\n";
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cout << "/////////////////////////////////////////////////////////\n\n";
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cout << "Type anything or [q or Q] to quit\n\n";
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my_grammar g;
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string str;
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while (getline(cin, str))
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{
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if (str.empty() || str[0] == 'q' || str[0] == 'Q')
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break;
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if (parse(str.c_str(), g, space_p).full)
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{
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cout << "parsing succeeded\n";
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}
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else
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{
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cout << "parsing failed\n";
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}
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}
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cout << "Bye... :-) \n\n";
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return 0;
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}
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