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  1. #include <string>
  2. #include <boost/spirit/include/qi.hpp>
  3. #include <boost/fusion/include/adapt_struct.hpp>
  4.  
  5. struct Date {
  6.     int year, month, day;
  7. };
  8. struct Time {
  9.     int hour, minute, second;
  10. };
  11.  
  12. BOOST_FUSION_ADAPT_STRUCT(
  13.     Date,
  14.     (int, year)
  15.     (int, month)
  16.     (int, day)
  17. )
  18.  
  19. BOOST_FUSION_ADAPT_STRUCT(
  20.     Time,
  21.     (int, hour)
  22.     (int, minute)
  23.     (int, second)
  24. )
  25.  
  26. namespace qi = boost::spirit::qi;
  27. namespace ascii = boost::spirit::ascii;
  28. typedef std::string::const_iterator Iterator;
  29.  
  30. class DateParser:
  31.     public qi::grammar < Iterator, Date() > {
  32.         qi::rule < Iterator, Date() > main;
  33.     public:
  34.         DateParser(): base_type(main) {
  35.             main %= qi::int_ >> '-' >> // Year
  36.                     qi::int_ >> '-' >> // Month
  37.                     qi::int_;          // Day
  38.         }
  39. };
  40.  
  41. class TimeParser:
  42.     public qi::grammar < Iterator, Time() > {
  43.         qi::rule < Iterator, Time() > main;
  44.     public:
  45.         TimeParser(): base_type(main) {
  46.             main %= qi::int_ >> ':' >> // Hour
  47.                     qi::int_ >> ':' >> // Minute
  48.                     qi::int_;          // Second
  49.         }
  50. };
  51.  
  52. class DateTimeParser:
  53.     public qi::grammar < Iterator, boost::variant<Date, Time>() > {
  54.         qi::rule < Iterator, boost::variant<Date, Time>()> main;
  55.     public:
  56.         DateTimeParser(): base_type(main) {
  57.             main %= date_parser | time_parser;
  58.         }
  59.         DateParser date_parser;
  60.         TimeParser time_parser;
  61. };
  62.  
  63. #include<iostream>
  64. #include<cstdio>
  65.  
  66. struct Printer : public boost::static_visitor<> {
  67.     void operator()(Date a) const {
  68.         printf("Year: %d, Month: %d, Day: %d\n", a.year, a.month, a.day);
  69.     }
  70.     void operator()(Time a) const {
  71.         printf("Hour: %d, Minute: %d, Second: %d\n", a.hour, a.minute, a.second);
  72.     }
  73. };
  74.  
  75. int main() {
  76.     std::string s;
  77.     std::getline(std::cin, s);
  78.     Iterator beg = s.begin(), end = s.end();
  79.     boost::variant<Date, Time> ret;
  80.     phrase_parse(beg, end, DateTimeParser(), ascii::space, ret);
  81.     if (beg != end)
  82.         puts("Parse failed.");
  83.     else
  84.         boost::apply_visitor(Printer(), ret);
  85. }
  86.  
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https://ideone.com/GW4jO
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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