69 lines
1.8 KiB
C++
69 lines
1.8 KiB
C++
/*=============================================================================
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Copyright (c) 2003 Vaclav Vesely
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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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#include <boost/assert.hpp>
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#include <iostream>
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#include <boost/cstdlib.hpp>
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#include <boost/spirit/include/classic_core.hpp>
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#include <boost/spirit/include/classic_distinct.hpp>
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using namespace std;
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using namespace boost;
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using namespace BOOST_SPIRIT_CLASSIC_NS;
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// keyword_p for C++
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// (for basic usage instead of std_p)
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const distinct_parser<> keyword_p("0-9a-zA-Z_");
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// keyword_d for C++
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// (for mor intricate usage, for example together with symbol tables)
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const distinct_directive<> keyword_d("0-9a-zA-Z_");
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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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typedef rule<ScannerT> rule_t;
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definition(my_grammar const& self)
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{
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top
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=
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keyword_p("declare") // use keyword_p instead of std_p
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>> !ch_p(':')
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>> keyword_d[str_p("ident")] // use keyword_d
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;
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}
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rule_t top;
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rule_t const& start() const
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{
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return top;
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}
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};
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};
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int main()
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{
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my_grammar gram;
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parse_info<> info;
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info = parse("declare ident", gram, space_p);
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BOOST_ASSERT(info.full); // valid input
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info = parse("declare: ident", gram, space_p);
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BOOST_ASSERT(info.full); // valid input
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info = parse("declareident", gram, space_p);
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BOOST_ASSERT(!info.hit); // invalid input
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return exit_success;
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}
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