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