| /*============================================================================= |
| 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 <cassert> |
| #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); |
| assert(info.full); // valid input |
| |
| info = parse("declare: ident", gram, space_p); |
| assert(info.full); // valid input |
| |
| info = parse("declareident", gram, space_p); |
| assert(!info.hit); // invalid input |
| |
| return exit_success; |
| } |