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 * $Date$
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(c: inp[i], loc: 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(n: 0) >= '0') && (s.at(n: 0) <= '9')) {
63 return boost::lexical_cast<unsigned short>(arg: s);
64 }
65 else {
66 std::string str = convert_to_lower(inp: 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::month_type month_type;
117 unsigned pos = 0;
118 unsigned short year(0), month(0), day(0);
119 typedef typename std::basic_string<char>::traits_type traits_type;
120 typedef boost::char_separator<char, traits_type> char_separator_type;
121 typedef boost::tokenizer<char_separator_type,
122 std::basic_string<char>::const_iterator,
123 std::basic_string<char> > tokenizer;
124 typedef boost::tokenizer<char_separator_type,
125 std::basic_string<char>::const_iterator,
126 std::basic_string<char> >::iterator tokenizer_iterator;
127 // may need more delimiters, these work for the regression tests
128 const char sep_char[] = {',','-','.',' ','/','\0'};
129 char_separator_type sep(sep_char);
130 tokenizer tok(s,sep);
131 for(tokenizer_iterator beg=tok.begin();
132 beg!=tok.end() && pos < spec_str.size();
133 ++beg, ++pos) {
134 switch(spec_str.at(n: pos)) {
135 case 'y':
136 {
137 year = boost::lexical_cast<unsigned short>(arg: *beg);
138 break;
139 }
140 case 'm':
141 {
142 month = month_str_to_ushort<month_type>(*beg);
143 break;
144 }
145 case 'd':
146 {
147 day = boost::lexical_cast<unsigned short>(arg: *beg);
148 break;
149 }
150 default: break;
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 //typename date_type::ymd_type ymd((year_type::min)(),1,1);
163 unsigned short y = 0, m = 0, d = 0;
164
165 /* The two bool arguments state that parsing will not wrap
166 * (only the first 8 characters will be parsed) and partial
167 * strings will not be parsed.
168 * Ex:
169 * "2005121" will parse 2005 & 12, but not the "1" */
170 boost::offset_separator osf(offsets, offsets+3, false, false);
171
172 typedef typename boost::tokenizer<boost::offset_separator,
173 std::basic_string<char>::const_iterator,
174 std::basic_string<char> > tokenizer_type;
175 tokenizer_type tok(s, osf);
176 for(typename tokenizer_type::iterator ti=tok.begin(); ti!=tok.end();++ti) {
177 unsigned short i = boost::lexical_cast<unsigned short>(arg: *ti);
178 switch(pos) {
179 case 0: y = i; break;
180 case 1: m = i; break;
181 case 2: d = i; break;
182 default: 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: 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: loc);
266 while(wsb != wse) {
267 ss << fac.narrow(c: *wsb++, dfault: '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
317

source code of boost/boost/date_time/date_parsing.hpp