109 lines
3.3 KiB
C++
109 lines
3.3 KiB
C++
/*=============================================================================
|
|
Copyright (c) 2001-2011 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;
|
|
}
|
|
|