ceph/src/boost/boost/date_time/date_parsing.hpp

   1 #ifndef _DATE_TIME_DATE_PARSING_HPP___
   2 #define _DATE_TIME_DATE_PARSING_HPP___
   3
   4 /* Copyright (c) 2002,2003,2005 CrystalClear Software, Inc.
   5  * Use, modification and distribution is subject to the
   6  * Boost Software License, Version 1.0. (See accompanying
   7  * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
   8  * Author: Jeff Garland, Bart Garst
   9  * $Date$
  10  */
  11
  12 #include <map>
  13 #include <string>
  14 #include <sstream>
  15 #include <iterator>
  16 #include <algorithm>
  17 #include <boost/tokenizer.hpp>
  18 #include <boost/lexical_cast.hpp>
  19 #include <boost/date_time/compiler_config.hpp>
  20 #include <boost/date_time/parse_format_base.hpp>
  21 #include <boost/date_time/period.hpp>
  22
  23 #if defined(BOOST_DATE_TIME_NO_LOCALE)
  24 #include <cctype> // ::tolower(int)
  25 #else
  26 #include <locale> // std::tolower(char, locale)
  27 #endif
  28
  29 namespace boost {
  30 namespace date_time {
  31
  32   //! A function to replace the std::transform( , , ,tolower) construct
  33   /*! This function simply takes a string, and changes all the characters
  34    * in that string to lowercase (according to the default system locale).
  35    * In the event that a compiler does not support locales, the old
  36    * C style tolower() is used.
  37    */
  38   inline
  39   std::string
  40   convert_to_lower(std::string inp)
  41   {
  42 #if !defined(BOOST_DATE_TIME_NO_LOCALE)
  43     const std::locale loc(std::locale::classic());
  44 #endif
  45     std::string::size_type i = 0, n = inp.length();
  46     for (; i < n; ++i) {
  47       inp[i] =
  48 #if defined(BOOST_DATE_TIME_NO_LOCALE)
  49         static_cast<char>(std::tolower(inp[i]));
  50 #else
  51         // tolower and others were brought in to std for borland >= v564
  52         // in compiler_config.hpp
  53         std::tolower(inp[i], loc);
  54 #endif
  55     }
  56     return inp;
  57   }
  58
  59     //! Helper function for parse_date.
  60     template<class month_type>
  61     inline unsigned short
  62     month_str_to_ushort(std::string const& s) {
  63       if((s.at(0) >= '0') && (s.at(0) <= '9')) {
  64         return boost::lexical_cast<unsigned short>(s);
  65       }
  66       else {
  67         std::string str = convert_to_lower(s);
  68         //c++98 support
  69 #if defined(BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX)
  70         static std::map<std::string, unsigned short> month_map;
  71         typedef std::map<std::string, unsigned short>::value_type vtype;
  72         if( month_map.empty() ) {
  73           month_map.insert( vtype("jan", static_cast<unsigned short>(1)) );
  74           month_map.insert( vtype("january", static_cast<unsigned short>(1)) );
  75           month_map.insert( vtype("feb", static_cast<unsigned short>(2)) );
  76           month_map.insert( vtype("february", static_cast<unsigned short>(2)) );
  77           month_map.insert( vtype("mar", static_cast<unsigned short>(3)) );
  78           month_map.insert( vtype("march", static_cast<unsigned short>(3)) );
  79           month_map.insert( vtype("apr", static_cast<unsigned short>(4)) );
  80           month_map.insert( vtype("april", static_cast<unsigned short>(4)) );
  81           month_map.insert( vtype("may", static_cast<unsigned short>(5)) );
  82           month_map.insert( vtype("jun", static_cast<unsigned short>(6)) );
  83           month_map.insert( vtype("june", static_cast<unsigned short>(6)) );
  84           month_map.insert( vtype("jul", static_cast<unsigned short>(7)) );
  85           month_map.insert( vtype("july", static_cast<unsigned short>(7)) );
  86           month_map.insert( vtype("aug", static_cast<unsigned short>(8)) );
  87           month_map.insert( vtype("august", static_cast<unsigned short>(8)) );
  88           month_map.insert( vtype("sep", static_cast<unsigned short>(9)) );
  89           month_map.insert( vtype("september", static_cast<unsigned short>(9)) );
  90           month_map.insert( vtype("oct", static_cast<unsigned short>(10)) );
  91           month_map.insert( vtype("october", static_cast<unsigned short>(10)) );
  92           month_map.insert( vtype("nov", static_cast<unsigned short>(11)) );
  93           month_map.insert( vtype("november", static_cast<unsigned short>(11)) );
  94           month_map.insert( vtype("dec", static_cast<unsigned short>(12)) );
  95           month_map.insert( vtype("december", static_cast<unsigned short>(12)) );
  96         }
  97 #else  //c+11 and beyond
  98         static std::map<std::string, unsigned short> month_map =
  99           { { "jan", static_cast<unsigned short>(1) },  { "january",   static_cast<unsigned short>(1) },
 100             { "feb", static_cast<unsigned short>(2) },  { "february",  static_cast<unsigned short>(2) },
 101             { "mar", static_cast<unsigned short>(3) },  { "march",     static_cast<unsigned short>(3) },
 102             { "apr", static_cast<unsigned short>(4) },  { "april",     static_cast<unsigned short>(4) },
 103             { "may", static_cast<unsigned short>(5) },
 104             { "jun", static_cast<unsigned short>(6) },  { "june",      static_cast<unsigned short>(6) },
 105             { "jul", static_cast<unsigned short>(7) },  { "july",      static_cast<unsigned short>(7) },
 106             { "aug", static_cast<unsigned short>(8) },  { "august",    static_cast<unsigned short>(8) },
 107             { "sep", static_cast<unsigned short>(9) },  { "september", static_cast<unsigned short>(9) },
 108             { "oct", static_cast<unsigned short>(10) }, { "october",   static_cast<unsigned short>(10)},
 109             { "nov", static_cast<unsigned short>(11) }, { "november",  static_cast<unsigned short>(11)},
 110             { "dec", static_cast<unsigned short>(12) }, { "december",  static_cast<unsigned short>(12)}
 111           };
 112 #endif
 113         std::map<std::string, unsigned short>::const_iterator mitr = month_map.find( str );
 114         if ( mitr !=  month_map.end() ) {
 115           return mitr->second;
 116         }
 117       }
 118       return 13; // intentionally out of range - name not found
 119     }
 120
 121
 122     //! Generic function to parse a delimited date (eg: 2002-02-10)
 123     /*! Accepted formats are: "2003-02-10" or " 2003-Feb-10" or
 124      * "2003-Feburary-10"
 125      * The order in which the Month, Day, & Year appear in the argument
 126      * string can be accomodated by passing in the appropriate ymd_order_spec
 127      */
 128     template<class date_type>
 129     date_type
 130     parse_date(const std::string& s, int order_spec = ymd_order_iso) {
 131       std::string spec_str;
 132       if(order_spec == ymd_order_iso) {
 133         spec_str = "ymd";
 134       }
 135       else if(order_spec == ymd_order_dmy) {
 136         spec_str = "dmy";
 137       }
 138       else { // (order_spec == ymd_order_us)
 139         spec_str = "mdy";
 140       }
 141
 142       typedef typename date_type::month_type month_type;
 143       unsigned pos = 0;
 144       unsigned short year(0), month(0), day(0);
 145       typedef typename std::basic_string<char>::traits_type traits_type;
 146       typedef boost::char_separator<char, traits_type> char_separator_type;
 147       typedef boost::tokenizer<char_separator_type,
 148                                std::basic_string<char>::const_iterator,
 149                                std::basic_string<char> > tokenizer;
 150       typedef boost::tokenizer<char_separator_type,
 151                                std::basic_string<char>::const_iterator,
 152                                std::basic_string<char> >::iterator tokenizer_iterator;
 153       // may need more delimiters, these work for the regression tests
 154       const char sep_char[] = {',','-','.',' ','/','\0'};
 155       char_separator_type sep(sep_char);
 156       tokenizer tok(s,sep);
 157       for(tokenizer_iterator beg=tok.begin();
 158           beg!=tok.end() && pos < spec_str.size();
 159           ++beg, ++pos) {
 160         switch(spec_str.at(pos)) {
 161           case 'y':
 162           {
 163             year = boost::lexical_cast<unsigned short>(*beg);
 164             break;
 165           }
 166           case 'm':
 167           {
 168             month = month_str_to_ushort<month_type>(*beg);
 169             break;
 170           }
 171           case 'd':
 172           {
 173             day = boost::lexical_cast<unsigned short>(*beg);
 174             break;
 175           }
 176           default: break;
 177         } //switch
 178       }
 179       return date_type(year, month, day);
 180     }
 181
 182     //! Generic function to parse undelimited date (eg: 20020201)
 183     template<class date_type>
 184     date_type
 185     parse_undelimited_date(const std::string& s) {
 186       int offsets[] = {4,2,2};
 187       int pos = 0;
 188       //typename date_type::ymd_type ymd((year_type::min)(),1,1);
 189       unsigned short y = 0, m = 0, d = 0;
 190
 191       /* The two bool arguments state that parsing will not wrap
 192        * (only the first 8 characters will be parsed) and partial
 193        * strings will not be parsed.
 194        * Ex:
 195        * "2005121" will parse 2005 & 12, but not the "1" */
 196       boost::offset_separator osf(offsets, offsets+3, false, false);
 197
 198       typedef typename boost::tokenizer<boost::offset_separator,
 199                                         std::basic_string<char>::const_iterator,
 200                                         std::basic_string<char> > tokenizer_type;
 201       tokenizer_type tok(s, osf);
 202       for(typename tokenizer_type::iterator ti=tok.begin(); ti!=tok.end();++ti) {
 203         unsigned short i = boost::lexical_cast<unsigned short>(*ti);
 204         switch(pos) {
 205         case 0: y = i; break;
 206         case 1: m = i; break;
 207         case 2: d = i; break;
 208         default:       break;
 209         }
 210         pos++;
 211       }
 212       return date_type(y,m,d);
 213     }
 214
 215     //! Helper function for 'date gregorian::from_stream()'
 216     /*! Creates a string from the iterators that reference the
 217      * begining & end of a char[] or string. All elements are
 218      * used in output string */
 219     template<class date_type, class iterator_type>
 220     inline
 221     date_type
 222     from_stream_type(iterator_type& beg,
 223                      iterator_type const& end,
 224                      char)
 225     {
 226       std::ostringstream ss;
 227       while(beg != end) {
 228         ss << *beg++;
 229       }
 230       return parse_date<date_type>(ss.str());
 231     }
 232
 233     //! Helper function for 'date gregorian::from_stream()'
 234     /*! Returns the first string found in the stream referenced by the
 235      * begining & end iterators */
 236     template<class date_type, class iterator_type>
 237     inline
 238     date_type
 239     from_stream_type(iterator_type& beg,
 240                      iterator_type const& /* end */,
 241                      std::string const&)
 242     {
 243       return parse_date<date_type>(*beg);
 244     }
 245
 246     /* I believe the wchar stuff would be best elsewhere, perhaps in
 247      * parse_date<>()? In the mean time this gets us started... */
 248     //! Helper function for 'date gregorian::from_stream()'
 249     /*! Creates a string from the iterators that reference the
 250      * begining & end of a wstring. All elements are
 251      * used in output string */
 252     template<class date_type, class iterator_type>
 253     inline
 254     date_type from_stream_type(iterator_type& beg,
 255                                iterator_type const& end,
 256                                wchar_t)
 257     {
 258       std::ostringstream ss;
 259 #if !defined(BOOST_DATE_TIME_NO_LOCALE)
 260       std::locale loc;
 261       std::ctype<wchar_t> const& fac = std::use_facet<std::ctype<wchar_t> >(loc);
 262       while(beg != end) {
 263         ss << fac.narrow(*beg++, 'X'); // 'X' will cause exception to be thrown
 264       }
 265 #else
 266       while(beg != end) {
 267         char c = 'X'; // 'X' will cause exception to be thrown
 268         const wchar_t wc = *beg++;
 269         if (wc >= 0 && wc <= 127)
 270           c = static_cast< char >(wc);
 271         ss << c;
 272       }
 273 #endif
 274       return parse_date<date_type>(ss.str());
 275     }
 276 #ifndef BOOST_NO_STD_WSTRING
 277     //! Helper function for 'date gregorian::from_stream()'
 278     /*! Creates a string from the first wstring found in the stream
 279      * referenced by the begining & end iterators */
 280     template<class date_type, class iterator_type>
 281     inline
 282     date_type
 283     from_stream_type(iterator_type& beg,
 284                      iterator_type const& /* end */,
 285                      std::wstring const&) {
 286       std::wstring ws = *beg;
 287       std::ostringstream ss;
 288       std::wstring::iterator wsb = ws.begin(), wse = ws.end();
 289 #if !defined(BOOST_DATE_TIME_NO_LOCALE)
 290       std::locale loc;
 291       std::ctype<wchar_t> const& fac = std::use_facet<std::ctype<wchar_t> >(loc);
 292       while(wsb != wse) {
 293         ss << fac.narrow(*wsb++, 'X'); // 'X' will cause exception to be thrown
 294       }
 295 #else
 296       while(wsb != wse) {
 297         char c = 'X'; // 'X' will cause exception to be thrown
 298         const wchar_t wc = *wsb++;
 299         if (wc >= 0 && wc <= 127)
 300           c = static_cast< char >(wc);
 301         ss << c;
 302       }
 303 #endif
 304       return parse_date<date_type>(ss.str());
 305     }
 306 #endif // BOOST_NO_STD_WSTRING
 307 #if (defined(BOOST_MSVC) && (_MSC_VER < 1300))
 308     // This function cannot be compiled with MSVC 6.0 due to internal compiler shorcomings
 309 #else
 310     //! function called by wrapper functions: date_period_from_(w)string()
 311     template<class date_type, class charT>
 312     period<date_type, typename date_type::duration_type>
 313     from_simple_string_type(const std::basic_string<charT>& s){
 314       typedef typename std::basic_string<charT>::traits_type traits_type;
 315       typedef typename boost::char_separator<charT, traits_type> char_separator;
 316       typedef typename boost::tokenizer<char_separator,
 317                                         typename std::basic_string<charT>::const_iterator,
 318                                         std::basic_string<charT> > tokenizer;
 319       const charT sep_list[4] = {'[','/',']','\0'};
 320       char_separator sep(sep_list);
 321       tokenizer tokens(s, sep);
 322       typename tokenizer::iterator tok_it = tokens.begin();
 323       std::basic_string<charT> date_string = *tok_it;
 324       // get 2 string iterators and generate a date from them
 325       typename std::basic_string<charT>::iterator date_string_start = date_string.begin(),
 326                                                   date_string_end = date_string.end();
 327       typedef typename std::iterator_traits<typename std::basic_string<charT>::iterator>::value_type value_type;
 328       date_type d1 = from_stream_type<date_type>(date_string_start, date_string_end, value_type());
 329       date_string = *(++tok_it); // next token
 330       date_string_start = date_string.begin(), date_string_end = date_string.end();
 331       date_type d2 = from_stream_type<date_type>(date_string_start, date_string_end, value_type());
 332       return period<date_type, typename date_type::duration_type>(d1, d2);
 333     }
 334 #endif
 335
 336 } } //namespace date_time
 337
 338
 339
 340
 341 #endif
 342