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