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

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C++ Header | 330 lines | 244 code | 46 blank | 40 comment | 16 complexity | 4b20ecb5e8a6e6266a6338fafbfe71fb MD5 | raw file
  1
  2#ifndef DATE_TIME_DATE_GENERATOR_PARSER_HPP__
  3#define DATE_TIME_DATE_GENERATOR_PARSER_HPP__
  4
  5/* Copyright (c) 2005 CrystalClear Software, Inc.
  6 * Use, modification and distribution is subject to the 
  7 * Boost Software License, Version 1.0. (See accompanying
  8 * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
  9 * Author: Jeff Garland, Bart Garst
 10 * $Date: 2008-11-13 06:37:53 +1100 (Thu, 13 Nov 2008) $
 11 */
 12
 13#include <string>
 14#include <vector>
 15#include <iterator> // istreambuf_iterator
 16#include <boost/throw_exception.hpp>
 17#include <boost/date_time/compiler_config.hpp>
 18#include <boost/date_time/string_parse_tree.hpp>
 19#include <boost/date_time/date_generators.hpp>
 20#include <boost/date_time/format_date_parser.hpp>
 21
 22namespace boost { namespace date_time {
 23
 24  //! Class for date_generator parsing 
 25  /*! The elements of a date_generator "phrase" are parsed from the input stream in a 
 26   *  particular order. All elements are required and the order in which they appear 
 27   *  cannot change, however, the elements themselves can be changed. The default 
 28   *  elements and their order are as follows:
 29   *
 30   * - partial_date                     => "dd Month"
 31   * - nth_day_of_the_week_in_month     => "nth weekday of month"
 32   * - first_day_of_the_week_in_month   => "first weekday of month"
 33   * - last_day_of_the_week_in_month    => "last weekday of month"
 34   * - first_day_of_the_week_after      => "weekday after"
 35   * - first_day_of_the_week_before     => "weekday before"
 36   *
 37   * Weekday and Month names and formats are handled via the date_input_facet. 
 38   *
 39   */
 40  template<class date_type, typename charT>
 41  class date_generator_parser
 42  {
 43   public:
 44    typedef std::basic_string<charT>        string_type;
 45    typedef std::istreambuf_iterator<charT> stream_itr_type;
 46
 47    typedef typename date_type::month_type       month_type;
 48    typedef typename date_type::day_of_week_type day_of_week_type;
 49    typedef typename date_type::day_type         day_type;
 50
 51    typedef string_parse_tree<charT>                          parse_tree_type;
 52    typedef typename parse_tree_type::parse_match_result_type match_results;
 53    typedef std::vector<std::basic_string<charT> >            collection_type;
 54
 55    typedef partial_date<date_type>          partial_date_type;
 56    typedef nth_kday_of_month<date_type>     nth_kday_type;
 57    typedef first_kday_of_month<date_type>   first_kday_type;
 58    typedef last_kday_of_month<date_type>    last_kday_type;
 59    typedef first_kday_after<date_type>      kday_after_type;
 60    typedef first_kday_before<date_type>     kday_before_type;
 61
 62    typedef charT char_type;
 63    static const char_type first_string[6];
 64    static const char_type second_string[7];
 65    static const char_type third_string[6];
 66    static const char_type fourth_string[7];
 67    static const char_type fifth_string[6];
 68    static const char_type last_string[5];
 69    static const char_type before_string[8];
 70    static const char_type after_string[6];
 71    static const char_type of_string[3];
 72
 73    enum phrase_elements {first=0, second, third, fourth, fifth, last,
 74                          before, after, of, number_of_phrase_elements};
 75
 76    //! Creates a date_generator_parser with the default set of "element_strings"
 77    date_generator_parser()
 78    {
 79      element_strings(string_type(first_string),
 80                      string_type(second_string),
 81                      string_type(third_string),
 82                      string_type(fourth_string),
 83                      string_type(fifth_string),
 84                      string_type(last_string),
 85                      string_type(before_string),
 86                      string_type(after_string),
 87                      string_type(of_string));
 88    }
 89
 90    //! Creates a date_generator_parser using a user defined set of element strings
 91    date_generator_parser(const string_type& first_str,
 92                          const string_type& second_str,
 93                          const string_type& third_str,
 94                          const string_type& fourth_str,
 95                          const string_type& fifth_str,
 96                          const string_type& last_str,
 97                          const string_type& before_str,
 98                          const string_type& after_str,
 99                          const string_type& of_str)
100    {
101      element_strings(first_str, second_str, third_str, fourth_str, fifth_str,
102                      last_str, before_str, after_str, of_str);
103    }
104
105    //! Replace strings that determine nth week for generator
106    void element_strings(const string_type& first_str,
107                         const string_type& second_str,
108                         const string_type& third_str,
109                         const string_type& fourth_str,
110                         const string_type& fifth_str,
111                         const string_type& last_str,
112                         const string_type& before_str,
113                         const string_type& after_str,
114                         const string_type& of_str)
115    {
116      collection_type phrases;
117      phrases.push_back(first_str);
118      phrases.push_back(second_str);
119      phrases.push_back(third_str);
120      phrases.push_back(fourth_str);
121      phrases.push_back(fifth_str);
122      phrases.push_back(last_str);
123      phrases.push_back(before_str);
124      phrases.push_back(after_str);
125      phrases.push_back(of_str);
126      m_element_strings = parse_tree_type(phrases, this->first); // enum first
127    }
128
129    void element_strings(const collection_type& col)
130    {
131      m_element_strings = parse_tree_type(col, this->first); // enum first
132    }
133
134    //! returns partial_date parsed from stream
135    template<class facet_type>
136    partial_date_type
137    get_partial_date_type(stream_itr_type& sitr,
138                          stream_itr_type& stream_end,
139                          std::ios_base& a_ios,
140                          const facet_type& facet) const
141    {
142      // skip leading whitespace
143      while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; }
144
145      day_type d(1);
146      month_type m(1);
147      facet.get(sitr, stream_end, a_ios, d);
148      facet.get(sitr, stream_end, a_ios, m);
149
150      return partial_date_type(d,m);
151    }
152
153    //! returns nth_kday_of_week parsed from stream
154    template<class facet_type>
155    nth_kday_type
156    get_nth_kday_type(stream_itr_type& sitr,
157                      stream_itr_type& stream_end,
158                      std::ios_base& a_ios,
159                      const facet_type& facet) const
160    {
161      // skip leading whitespace
162      while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; }
163 
164      typename nth_kday_type::week_num wn;
165      day_of_week_type wd(0); // no default constructor
166      month_type m(1);        // no default constructor
167
168      match_results mr = m_element_strings.match(sitr, stream_end);
169      switch(mr.current_match) {
170        case first  : { wn = nth_kday_type::first; break; }
171        case second : { wn = nth_kday_type::second; break; }
172        case third  : { wn = nth_kday_type::third; break; }
173        case fourth : { wn = nth_kday_type::fourth; break; }
174        case fifth  : { wn = nth_kday_type::fifth; break; }
175        default:
176        {
177          boost::throw_exception(std::ios_base::failure("Parse failed. No match found for '" + mr.cache + "'"));
178          BOOST_DATE_TIME_UNREACHABLE_EXPRESSION(wn = nth_kday_type::first);
179        }
180      }                                         // week num
181      facet.get(sitr, stream_end, a_ios, wd);   // day_of_week
182      extract_element(sitr, stream_end, of);    // "of" element
183      facet.get(sitr, stream_end, a_ios, m);    // month
184
185      return nth_kday_type(wn, wd, m);
186    }
187
188    //! returns first_kday_of_week parsed from stream
189    template<class facet_type>
190    first_kday_type
191    get_first_kday_type(stream_itr_type& sitr,
192                        stream_itr_type& stream_end,
193                        std::ios_base& a_ios,
194                        const facet_type& facet) const
195    {
196      // skip leading whitespace
197      while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; }
198
199      day_of_week_type wd(0); // no default constructor
200      month_type m(1);        // no default constructor
201
202      extract_element(sitr, stream_end, first); // "first" element
203      facet.get(sitr, stream_end, a_ios, wd);   // day_of_week
204      extract_element(sitr, stream_end, of);    // "of" element
205      facet.get(sitr, stream_end, a_ios, m);    // month
206
207
208      return first_kday_type(wd, m);
209    }
210
211    //! returns last_kday_of_week parsed from stream
212    template<class facet_type>
213    last_kday_type
214    get_last_kday_type(stream_itr_type& sitr,
215                       stream_itr_type& stream_end,
216                       std::ios_base& a_ios,
217                       const facet_type& facet) const
218    {
219      // skip leading whitespace
220      while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; }
221
222      day_of_week_type wd(0); // no default constructor
223      month_type m(1);        // no default constructor
224 
225      extract_element(sitr, stream_end, last); // "last" element
226      facet.get(sitr, stream_end, a_ios, wd);  // day_of_week
227      extract_element(sitr, stream_end, of);   // "of" element
228      facet.get(sitr, stream_end, a_ios, m);   // month
229
230
231      return last_kday_type(wd, m);
232    }
233
234    //! returns first_kday_of_week parsed from stream
235    template<class facet_type>
236    kday_before_type
237    get_kday_before_type(stream_itr_type& sitr,
238                         stream_itr_type& stream_end,
239                         std::ios_base& a_ios,
240                         const facet_type& facet) const
241    {
242      // skip leading whitespace
243      while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; }
244
245      day_of_week_type wd(0); // no default constructor
246
247      facet.get(sitr, stream_end, a_ios, wd);   // day_of_week
248      extract_element(sitr, stream_end, before);// "before" element
249
250      return kday_before_type(wd);
251    }
252
253    //! returns first_kday_of_week parsed from stream
254    template<class facet_type>
255    kday_after_type
256    get_kday_after_type(stream_itr_type& sitr,
257                        stream_itr_type& stream_end,
258                        std::ios_base& a_ios,
259                        const facet_type& facet) const
260    {
261      // skip leading whitespace
262      while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; }
263
264      day_of_week_type wd(0); // no default constructor
265
266      facet.get(sitr, stream_end, a_ios, wd);   // day_of_week
267      extract_element(sitr, stream_end, after); // "after" element
268
269      return kday_after_type(wd);
270    }
271
272   private:
273    parse_tree_type m_element_strings;
274
275    //! Extracts phrase element from input. Throws ios_base::failure on error.
276    void extract_element(stream_itr_type& sitr,
277                         stream_itr_type& stream_end,
278                         typename date_generator_parser::phrase_elements ele) const
279    {
280      // skip leading whitespace
281      while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; }
282      match_results mr = m_element_strings.match(sitr, stream_end);
283      if(mr.current_match != ele) {
284        boost::throw_exception(std::ios_base::failure("Parse failed. No match found for '" + mr.cache + "'"));
285      }
286    }
287
288  };
289
290  template<class date_type, class CharT>
291  const typename date_generator_parser<date_type, CharT>::char_type
292  date_generator_parser<date_type, CharT>::first_string[6] =
293    {'f','i','r','s','t'};
294  template<class date_type, class CharT>
295  const typename date_generator_parser<date_type, CharT>::char_type
296  date_generator_parser<date_type, CharT>::second_string[7] =
297    {'s','e','c','o','n','d'};
298  template<class date_type, class CharT>
299  const typename date_generator_parser<date_type, CharT>::char_type
300  date_generator_parser<date_type, CharT>::third_string[6] =
301    {'t','h','i','r','d'};
302  template<class date_type, class CharT>
303  const typename date_generator_parser<date_type, CharT>::char_type
304  date_generator_parser<date_type, CharT>::fourth_string[7] =
305    {'f','o','u','r','t','h'};
306  template<class date_type, class CharT>
307  const typename date_generator_parser<date_type, CharT>::char_type
308  date_generator_parser<date_type, CharT>::fifth_string[6] =
309    {'f','i','f','t','h'};
310  template<class date_type, class CharT>
311  const typename date_generator_parser<date_type, CharT>::char_type
312  date_generator_parser<date_type, CharT>::last_string[5] =
313    {'l','a','s','t'};
314  template<class date_type, class CharT>
315  const typename date_generator_parser<date_type, CharT>::char_type
316  date_generator_parser<date_type, CharT>::before_string[8] =
317    {'b','e','f','o','r','e'};
318  template<class date_type, class CharT>
319  const typename date_generator_parser<date_type, CharT>::char_type
320  date_generator_parser<date_type, CharT>::after_string[6] =
321    {'a','f','t','e','r'};
322  template<class date_type, class CharT>
323  const typename date_generator_parser<date_type, CharT>::char_type
324  date_generator_parser<date_type, CharT>::of_string[3] =
325    {'o','f'};
326
327} } //namespace
328
329#endif // DATE_TIME_DATE_GENERATOR_PARSER_HPP__
330