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" |
57 | special_values_parser() |
58 | { |
59 | sv_strings(nadt_str: string_type(nadt_string), |
60 | neg_inf_str: string_type(neg_inf_string), |
61 | pos_inf_str: string_type(pos_inf_string), |
62 | min_dt_str: string_type(min_date_time_string), |
63 | max_dt_str: 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 | |
160 | |