ceph/src/boost/boost/wave/util/time_conversion_helper.hpp

   1 /*=============================================================================
   2     Boost.Wave: A Standard compliant C++ preprocessor library
   3
   4     http://www.boost.org/
   5
   6     Copyright (c) 2001-2012 Hartmut Kaiser. Distributed under the Boost
   7     Software License, Version 1.0. (See accompanying file
   8     LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   9 =============================================================================*/
  10
  11 #if !defined(BOOST_TIME_CONVERSION_HELPER_HPP_DA97E389_1797_43BA_82AE_B071064B3EF4_INCLUDED)
  12 #define BOOST_TIME_CONVERSION_HELPER_HPP_DA97E389_1797_43BA_82AE_B071064B3EF4_INCLUDED
  13
  14 #include <ctime>
  15 #include <cstring>
  16
  17 #include <boost/config.hpp>
  18 #include <boost/spirit/include/classic_core.hpp>
  19 #include <boost/spirit/include/classic_symbols.hpp>
  20 #include <boost/spirit/include/classic_assign_actor.hpp>
  21 #include <boost/spirit/include/classic_push_back_actor.hpp>
  22
  23 #if !defined(spirit_append_actor)
  24 #define spirit_append_actor(actor) boost::spirit::classic::push_back_a(actor)
  25 #define spirit_assign_actor(actor) boost::spirit::classic::assign_a(actor)
  26 #endif // !defined(spirit_append_actor)
  27
  28 // this must occur after all of the includes and before any code appears
  29 #ifdef BOOST_HAS_ABI_HEADERS
  30 #include BOOST_ABI_PREFIX
  31 #endif
  32
  33 ///////////////////////////////////////////////////////////////////////////////
  34 namespace boost {
  35 namespace wave {
  36 namespace util {
  37
  38 namespace time_conversion {
  39
  40     using namespace std;    // some systems have std::tm etc. in namespace std
  41
  42 ///////////////////////////////////////////////////////////////////////////////
  43 //  define, whether the rule's should generate some debug output
  44 #define TRACE_CPP_TIME_CONVERSION \
  45     (BOOST_SPIRIT_DEBUG_FLAGS_CPP & BOOST_SPIRIT_DEBUG_FLAGS_TIME_CONVERSION) \
  46     /**/
  47
  48 ///////////////////////////////////////////////////////////////////////////////
  49 //  Grammar for parsing a date/time string generated by the C++ compiler from
  50 //  __DATE__ and __TIME__
  51     class time_conversion_grammar :
  52         public boost::spirit::classic::grammar<time_conversion_grammar>
  53     {
  54     public:
  55         time_conversion_grammar() : fYearIsCorrected(false)
  56         {
  57             using namespace std;        // some systems have memset in std
  58             memset (&time_stamp, 0, sizeof(tm));
  59             BOOST_SPIRIT_DEBUG_TRACE_RULE_NAME(*this, "time_conversion_grammar",
  60                 TRACE_CPP_TIME_CONVERSION);
  61         }
  62
  63         template <typename ScannerT>
  64         struct definition {
  65
  66             definition(time_conversion_grammar const &self)
  67             {
  68                 using boost::spirit::classic::int_p;
  69                 using boost::spirit::classic::add;
  70
  71             char const *m[] = {
  72                     "Jan", "Feb", "Mar", "Apr", "May", "Jun",
  73                     "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
  74                 };
  75
  76                 for (int i = 0; i < 12; ++i)
  77                     add (month, m[i], i);
  78
  79                 time_rule       // expected format is 'Dec 29 2001 11:23:59'
  80                     =   month[spirit_assign_actor(self.time_stamp.tm_mon)]
  81                     >>  int_p[spirit_assign_actor(self.time_stamp.tm_mday)]
  82                     >>  int_p[spirit_assign_actor(self.time_stamp.tm_year)]
  83                     >>  int_p[spirit_assign_actor(self.time_stamp.tm_hour)] >> ':'
  84                     >>  int_p[spirit_assign_actor(self.time_stamp.tm_min)] >> ':'
  85                     >>  int_p[spirit_assign_actor(self.time_stamp.tm_sec)]
  86                     ;
  87
  88                 BOOST_SPIRIT_DEBUG_TRACE_RULE(time_rule, TRACE_CPP_TIME_CONVERSION);
  89             }
  90
  91             boost::spirit::classic::rule<ScannerT> time_rule;
  92             boost::spirit::classic::symbols<> month;
  93
  94             boost::spirit::classic::rule<ScannerT> const&
  95             start() const { return time_rule; }
  96         };
  97
  98         void correct_year()
  99         {
 100             if (!fYearIsCorrected) {
 101                 time_stamp.tm_year -= 1900;
 102                 fYearIsCorrected = true;
 103             }
 104         }
 105
 106         mutable tm time_stamp;
 107         bool fYearIsCorrected;
 108     };
 109
 110 ///////////////////////////////////////////////////////////////////////////////
 111 // calculate the time of the compilation as a std::time_t to ensure correctness
 112 // of the saved dfa table
 113     class time_conversion_helper
 114     {
 115     public:
 116         time_conversion_helper(char const *act_time) : compile_time(0)
 117         {
 118             using namespace boost::spirit::classic;
 119
 120         time_conversion_grammar g;
 121         parse_info<> pi = parse (act_time, g, space_p);
 122
 123             if (pi.hit) {
 124                 g.correct_year();
 125                 compile_time = mktime(&g.time_stamp);
 126             }
 127             BOOST_ASSERT(0 != compile_time);
 128         }
 129
 130         time_t get_time() const { return compile_time; }
 131
 132     private:
 133         time_t compile_time;
 134     };
 135
 136 ///////////////////////////////////////////////////////////////////////////////
 137 #undef TRACE_CPP_TIME_CONVERSION
 138 }   // namespace time_conversion
 139
 140 // import time_conversion into the boost::wave::util namespace
 141 using namespace time_conversion;
 142
 143 ///////////////////////////////////////////////////////////////////////////////
 144 }   // namespace util
 145 }   // namespace wave
 146 }   // namespace boost
 147
 148 // the suffix header occurs after all of the code
 149 #ifdef BOOST_HAS_ABI_HEADERS
 150 #include BOOST_ABI_SUFFIX
 151 #endif
 152
 153 #endif // !defined(BOOST_TIME_CONVERSION_HELPER_HPP_DA97E389_1797_43BA_82AE_B071064B3EF4_INCLUDED)