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/Src/Dependencies/Boost/boost/date_time/date_parsing.hpp

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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: 2009-06-04 18:24:49 +1000 (Thu, 04 Jun 2009) $
 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
 26namespace boost {
 27namespace 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 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::year_type year_type;
117      typedef typename date_type::month_type month_type;
118      unsigned pos = 0;
119      unsigned short year(0), month(0), day(0);
120      typedef typename std::basic_string<char>::traits_type traits_type;
121      typedef boost::char_separator<char, traits_type> char_separator_type;
122      typedef boost::tokenizer<char_separator_type,
123                               std::basic_string<char>::const_iterator,
124                               std::basic_string<char> > tokenizer;
125      typedef boost::tokenizer<char_separator_type,
126                               std::basic_string<char>::const_iterator,
127                               std::basic_string<char> >::iterator tokenizer_iterator;
128      // may need more delimiters, these work for the regression tests
129      const char sep_char[] = {',','-','.',' ','/','\0'};
130      char_separator_type sep(sep_char);
131      tokenizer tok(s,sep);
132      for(tokenizer_iterator beg=tok.begin();
133          beg!=tok.end() && pos < spec_str.size();
134          ++beg, ++pos) {
135        switch(spec_str.at(pos)) {
136          case 'y':
137          {
138            year = boost::lexical_cast<unsigned short>(*beg);
139            break;
140          }
141          case 'm':
142          {
143            month = month_str_to_ushort<month_type>(*beg);
144            break;
145          }
146          case 'd':
147          {
148            day = boost::lexical_cast<unsigned short>(*beg);
149            break;
150          }
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      typedef typename date_type::year_type year_type;
163      //typename date_type::ymd_type ymd((year_type::min)(),1,1);
164      unsigned short y = 0, m = 0, d = 0;
165
166      /* The two bool arguments state that parsing will not wrap
167       * (only the first 8 characters will be parsed) and partial
168       * strings will not be parsed.
169       * Ex:
170       * "2005121" will parse 2005 & 12, but not the "1" */
171      boost::offset_separator osf(offsets, offsets+3, false, false);
172
173      typedef typename boost::tokenizer<boost::offset_separator,
174                                        std::basic_string<char>::const_iterator,
175                                        std::basic_string<char> > tokenizer_type;
176      tokenizer_type tok(s, osf);
177      for(typename tokenizer_type::iterator ti=tok.begin(); ti!=tok.end();++ti) {
178        unsigned short i = boost::lexical_cast<unsigned short>(*ti);
179        switch(pos) {
180        case 0: y = i; break;
181        case 1: m = i; break;
182        case 2: d = i; 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 boost::char_separator<charT, traits_type> char_separator;
290      typedef typename 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