| /*============================================================================= |
| Copyright (c) 2001-2010 Hartmut Kaiser |
| http://spirit.sourceforge.net/ |
| |
| Distributed under 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) |
| =============================================================================*/ |
| //[porting_guide_classic_includes |
| #include <boost/spirit/include/classic.hpp> |
| #include <boost/spirit/include/phoenix1.hpp> |
| #include <iostream> |
| #include <string> |
| //] |
| |
| //[porting_guide_classic_namespace |
| using namespace boost::spirit::classic; |
| //] |
| |
| //[porting_guide_classic_grammar |
| struct roman : public grammar<roman> |
| { |
| template <typename ScannerT> |
| struct definition |
| { |
| definition(roman const& self) |
| { |
| hundreds.add |
| ("C" , 100)("CC" , 200)("CCC" , 300)("CD" , 400)("D" , 500) |
| ("DC" , 600)("DCC" , 700)("DCCC" , 800)("CM" , 900) ; |
| |
| tens.add |
| ("X" , 10)("XX" , 20)("XXX" , 30)("XL" , 40)("L" , 50) |
| ("LX" , 60)("LXX" , 70)("LXXX" , 80)("XC" , 90) ; |
| |
| ones.add |
| ("I" , 1)("II" , 2)("III" , 3)("IV" , 4)("V" , 5) |
| ("VI" , 6)("VII" , 7)("VIII" , 8)("IX" , 9) ; |
| |
| first = eps_p [phoenix::var(self.r) = phoenix::val(0)] |
| >> ( +ch_p('M') [phoenix::var(self.r) += phoenix::val(1000)] |
| || hundreds [phoenix::var(self.r) += phoenix::_1] |
| || tens [phoenix::var(self.r) += phoenix::_1] |
| || ones [phoenix::var(self.r) += phoenix::_1] |
| ) ; |
| } |
| |
| rule<ScannerT> first; |
| symbols<unsigned> hundreds; |
| symbols<unsigned> tens; |
| symbols<unsigned> ones; |
| |
| rule<ScannerT> const& start() const { return first; } |
| }; |
| |
| roman(unsigned& r_) : r(r_) {} |
| unsigned& r; |
| }; |
| //] |
| |
| int main() |
| { |
| { |
| //[porting_guide_classic_parse |
| std::string input("1,1"); |
| parse_info<std::string::iterator> pi = parse(input.begin(), input.end(), int_p); |
| |
| if (pi.hit) |
| std::cout << "successful match!\n"; |
| |
| if (pi.full) |
| std::cout << "full match!\n"; |
| else |
| std::cout << "stopped at: " << std::string(pi.stop, input.end()) << "\n"; |
| |
| std::cout << "matched length: " << pi.length << "\n"; |
| //] |
| } |
| |
| { |
| //[porting_guide_classic_phrase_parse |
| std::string input(" 1, 1"); |
| parse_info<std::string::iterator> pi = parse(input.begin(), input.end(), int_p, space_p); |
| |
| if (pi.hit) |
| std::cout << "successful match!\n"; |
| |
| if (pi.full) |
| std::cout << "full match!\n"; |
| else |
| std::cout << "stopped at: " << std::string(pi.stop, input.end()) << "\n"; |
| |
| std::cout << "matched length: " << pi.length << "\n"; |
| //] |
| } |
| |
| { |
| //[porting_guide_classic_use_grammar |
| std::string input("MMIX"); // MMIX == 2009 |
| unsigned value = 0; |
| roman r(value); |
| parse_info<std::string::iterator> pi = parse(input.begin(), input.end(), r); |
| if (pi.hit) |
| std::cout << "successfully matched: " << value << "\n"; |
| //] |
| } |
| return 0; |
| } |
| |