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 19 namespace 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" special_values_parser()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 special_values_parser(const string_type & nadt_str,const string_type & neg_inf_str,const string_type & pos_inf_str,const string_type & min_dt_str,const string_type & max_dt_str)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 special_values_parser(typename collection_type::iterator beg,typename collection_type::iterator end)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 special_values_parser(const special_values_parser<date_type,charT> & svp)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 sv_strings(const string_type & nadt_str,const string_type & neg_inf_str,const string_type & pos_inf_str,const string_type & min_dt_str,const string_type & max_dt_str)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 match(stream_itr_type & sitr,stream_itr_type & str_end,match_results & mr) const109 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__ 159 160