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1 | /*============================================================================= |
2 | Copyright (c) 2001-2011 Hartmut Kaiser | |
3 | http://spirit.sourceforge.net/ | |
4 | ||
5 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
6 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
7 | =============================================================================*/ | |
8 | //[porting_guide_classic_includes | |
9 | #include <boost/spirit/include/classic.hpp> | |
10 | #include <boost/spirit/include/phoenix1.hpp> | |
11 | #include <iostream> | |
12 | #include <string> | |
13 | //] | |
14 | ||
15 | //[porting_guide_classic_namespace | |
16 | using namespace boost::spirit::classic; | |
17 | //] | |
18 | ||
19 | //[porting_guide_classic_grammar | |
20 | struct roman : public grammar<roman> | |
21 | { | |
22 | template <typename ScannerT> | |
23 | struct definition | |
24 | { | |
25 | definition(roman const& self) | |
26 | { | |
27 | hundreds.add | |
28 | ("C" , 100)("CC" , 200)("CCC" , 300)("CD" , 400)("D" , 500) | |
29 | ("DC" , 600)("DCC" , 700)("DCCC" , 800)("CM" , 900) ; | |
30 | ||
31 | tens.add | |
32 | ("X" , 10)("XX" , 20)("XXX" , 30)("XL" , 40)("L" , 50) | |
33 | ("LX" , 60)("LXX" , 70)("LXXX" , 80)("XC" , 90) ; | |
34 | ||
35 | ones.add | |
36 | ("I" , 1)("II" , 2)("III" , 3)("IV" , 4)("V" , 5) | |
37 | ("VI" , 6)("VII" , 7)("VIII" , 8)("IX" , 9) ; | |
38 | ||
39 | first = eps_p [phoenix::var(self.r) = phoenix::val(0)] | |
40 | >> ( +ch_p('M') [phoenix::var(self.r) += phoenix::val(1000)] | |
41 | || hundreds [phoenix::var(self.r) += phoenix::_1] | |
42 | || tens [phoenix::var(self.r) += phoenix::_1] | |
43 | || ones [phoenix::var(self.r) += phoenix::_1] | |
44 | ) ; | |
45 | } | |
46 | ||
47 | rule<ScannerT> first; | |
48 | symbols<unsigned> hundreds; | |
49 | symbols<unsigned> tens; | |
50 | symbols<unsigned> ones; | |
51 | ||
52 | rule<ScannerT> const& start() const { return first; } | |
53 | }; | |
54 | ||
55 | roman(unsigned& r_) : r(r_) {} | |
56 | unsigned& r; | |
57 | }; | |
58 | //] | |
59 | ||
60 | int main() | |
61 | { | |
62 | { | |
63 | //[porting_guide_classic_parse | |
64 | std::string input("1,1"); | |
65 | parse_info<std::string::iterator> pi = parse(input.begin(), input.end(), int_p); | |
66 | ||
67 | if (pi.hit) | |
68 | std::cout << "successful match!\n"; | |
69 | ||
70 | if (pi.full) | |
71 | std::cout << "full match!\n"; | |
72 | else | |
73 | std::cout << "stopped at: " << std::string(pi.stop, input.end()) << "\n"; | |
74 | ||
75 | std::cout << "matched length: " << pi.length << "\n"; | |
76 | //] | |
77 | } | |
78 | ||
79 | { | |
80 | //[porting_guide_classic_phrase_parse | |
81 | std::string input(" 1, 1"); | |
82 | parse_info<std::string::iterator> pi = parse(input.begin(), input.end(), int_p, space_p); | |
83 | ||
84 | if (pi.hit) | |
85 | std::cout << "successful match!\n"; | |
86 | ||
87 | if (pi.full) | |
88 | std::cout << "full match!\n"; | |
89 | else | |
90 | std::cout << "stopped at: " << std::string(pi.stop, input.end()) << "\n"; | |
91 | ||
92 | std::cout << "matched length: " << pi.length << "\n"; | |
93 | //] | |
94 | } | |
95 | ||
96 | { | |
97 | //[porting_guide_classic_use_grammar | |
98 | std::string input("MMIX"); // MMIX == 2009 | |
99 | unsigned value = 0; | |
100 | roman r(value); | |
101 | parse_info<std::string::iterator> pi = parse(input.begin(), input.end(), r); | |
102 | if (pi.hit) | |
103 | std::cout << "successfully matched: " << value << "\n"; | |
104 | //] | |
105 | } | |
106 | return 0; | |
107 | } | |
108 |