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

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C++ Header | 159 lines | 96 code | 20 blank | 43 comment | 1 complexity | f278df8ce945c74d0c8d2ab61824e681 MD5 | raw file
  1
  2#ifndef DATE_TIME_SPECIAL_VALUES_PARSER_HPP__
  3#define DATE_TIME_SPECIAL_VALUES_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: 
 11 */
 12
 13
 14#include "boost/date_time/string_parse_tree.hpp"
 15#include "boost/date_time/special_defs.hpp"
 16#include <string>
 17#include <vector>
 18
 19namespace boost { namespace date_time {
 20
 21  //! Class for special_value parsing 
 22  /*! 
 23   * TODO: add doc-comments for which elements can be changed
 24   * Parses input stream for strings representing special_values. 
 25   * Special values parsed are:
 26   *  - not_a_date_time
 27   *  - neg_infin
 28   *  - pod_infin
 29   *  - min_date_time
 30   *  - max_date_time
 31   */
 32  template<class date_type, typename charT>
 33  class special_values_parser
 34  {
 35   public:
 36    typedef std::basic_string<charT>        string_type;
 37    //typedef std::basic_stringstream<charT>  stringstream_type;
 38    typedef std::istreambuf_iterator<charT> stream_itr_type;
 39    //typedef typename string_type::const_iterator const_itr;
 40    //typedef typename date_type::year_type  year_type;
 41    //typedef typename date_type::month_type month_type;
 42    typedef typename date_type::duration_type duration_type;
 43    //typedef typename date_type::day_of_week_type day_of_week_type;
 44    //typedef typename date_type::day_type day_type;
 45    typedef string_parse_tree<charT> parse_tree_type;
 46    typedef typename parse_tree_type::parse_match_result_type match_results;
 47    typedef std::vector<std::basic_string<charT> > collection_type;
 48
 49    typedef charT char_type;
 50    static const char_type nadt_string[16];
 51    static const char_type neg_inf_string[10];
 52    static const char_type pos_inf_string[10];
 53    static const char_type min_date_time_string[18];
 54    static const char_type max_date_time_string[18];
 55   
 56    //! Creates a special_values_parser with the default set of "sv_strings"
 57    special_values_parser()
 58    {
 59      sv_strings(string_type(nadt_string),
 60                 string_type(neg_inf_string),
 61                 string_type(pos_inf_string),
 62                 string_type(min_date_time_string),
 63                 string_type(max_date_time_string));
 64    }
 65
 66    //! Creates a special_values_parser using a user defined set of element strings
 67    special_values_parser(const string_type& nadt_str,
 68                          const string_type& neg_inf_str,
 69                          const string_type& pos_inf_str,
 70                          const string_type& min_dt_str,
 71                          const string_type& max_dt_str)
 72    {
 73      sv_strings(nadt_str, neg_inf_str, pos_inf_str, min_dt_str, max_dt_str);
 74    }
 75
 76    special_values_parser(typename collection_type::iterator beg, typename collection_type::iterator end)
 77    {
 78      collection_type phrases;
 79      std::copy(beg, end, std::back_inserter(phrases));
 80      m_sv_strings = parse_tree_type(phrases, static_cast<int>(not_a_date_time));
 81    }
 82
 83    special_values_parser(const special_values_parser<date_type,charT>& svp)
 84    {
 85      this->m_sv_strings = svp.m_sv_strings;
 86    }
 87
 88    //! Replace special value strings
 89    void sv_strings(const string_type& nadt_str,
 90                    const string_type& neg_inf_str,
 91                    const string_type& pos_inf_str,
 92                    const string_type& min_dt_str,
 93                    const string_type& max_dt_str)
 94    {
 95      collection_type phrases;
 96      phrases.push_back(nadt_str);
 97      phrases.push_back(neg_inf_str);
 98      phrases.push_back(pos_inf_str);
 99      phrases.push_back(min_dt_str);
100      phrases.push_back(max_dt_str);
101      m_sv_strings = parse_tree_type(phrases, static_cast<int>(not_a_date_time));
102    }
103
104    /* Does not return a special_value because if the parsing fails, 
105     * the return value will always be not_a_date_time 
106     * (mr.current_match retains its default value of -1 on a failed 
107     * parse and that casts to not_a_date_time). */
108    //! Sets match_results.current_match to the corresponding special_value or -1
109    bool match(stream_itr_type& sitr, 
110                        stream_itr_type& str_end,
111                        match_results& mr) const
112    {
113      unsigned int level = 0;
114      m_sv_strings.match(sitr, str_end, mr, level);
115      return (mr.current_match != match_results::PARSE_ERROR);
116    }
117    /*special_values match(stream_itr_type& sitr, 
118                        stream_itr_type& str_end,
119                        match_results& mr) const
120    {
121      unsigned int level = 0;
122      m_sv_strings.match(sitr, str_end, mr, level);
123      if(mr.current_match == match_results::PARSE_ERROR) {
124        throw std::ios_base::failure("Parse failed. No match found for '" + mr.cache + "'");
125      }
126      return static_cast<special_values>(mr.current_match);
127    }*/
128                     
129
130   private:
131    parse_tree_type m_sv_strings;
132    
133  };
134
135  template<class date_type, class CharT>
136  const typename special_values_parser<date_type, CharT>::char_type
137  special_values_parser<date_type, CharT>::nadt_string[16] =
138  {'n','o','t','-','a','-','d','a','t','e','-','t','i','m','e'};
139  template<class date_type, class CharT>
140  const typename special_values_parser<date_type, CharT>::char_type
141  special_values_parser<date_type, CharT>::neg_inf_string[10] =
142  {'-','i','n','f','i','n','i','t','y'};
143  template<class date_type, class CharT>
144  const typename special_values_parser<date_type, CharT>::char_type
145  special_values_parser<date_type, CharT>::pos_inf_string[10] =
146  {'+','i','n','f','i','n','i','t','y'};
147  template<class date_type, class CharT>
148  const typename special_values_parser<date_type, CharT>::char_type
149  special_values_parser<date_type, CharT>::min_date_time_string[18] =
150  {'m','i','n','i','m','u','m','-','d','a','t','e','-','t','i','m','e'};
151  template<class date_type, class CharT>
152  const typename special_values_parser<date_type, CharT>::char_type
153  special_values_parser<date_type, CharT>::max_date_time_string[18] =
154  {'m','a','x','i','m','u','m','-','d','a','t','e','-','t','i','m','e'};
155
156} } //namespace
157
158#endif // DATE_TIME_SPECIAL_VALUES_PARSER_HPP__
159