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