/*============================================================================= 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) =============================================================================*/ // *** See the section "Look Ma' No Rules" in // *** chapter "Techniques" of the Spirit documentation // *** for information regarding this snippet #include <iostream> #include <boost/spirit/include/classic_core.hpp> using namespace BOOST_SPIRIT_CLASSIC_NS; namespace boost { namespace spirit { template <typename DerivedT> struct sub_grammar : parser<DerivedT> { typedef sub_grammar self_t; typedef DerivedT const& embed_t; template <typename ScannerT> struct result { typedef typename parser_result< typename DerivedT::start_t, ScannerT>::type type; }; DerivedT const& derived() const { return *static_cast<DerivedT const*>(this); } template <typename ScannerT> typename parser_result<self_t, ScannerT>::type parse(ScannerT const& scan) const { return derived().start.parse(scan); } }; }} /////////////////////////////////////////////////////////////////////////////// // // Client code // /////////////////////////////////////////////////////////////////////////////// struct skip_grammar : boost::spirit::sub_grammar<skip_grammar> { typedef alternative<alternative<space_parser, sequence<sequence< strlit<const char*>, kleene_star<difference<anychar_parser, chlit<char> > > >, chlit<char> > >, sequence<sequence< strlit<const char*>, kleene_star<difference<anychar_parser, strlit<const char*> > > >, strlit<const char*> > > start_t; skip_grammar() : start ( space_p | "//" >> *(anychar_p - '\n') >> '\n' | "/*" >> *(anychar_p - "*/") >> "*/" ) {} start_t start; }; int main() { skip_grammar g; bool success = parse( "/*this is a comment*/\n//this is a c++ comment\n\n", *g).full; assert(success); std::cout << "SUCCESS!!!\n"; return 0; }