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 <map>
13#include <string>
14#include <sstream>
15#include <iterator>
16#include <algorithm>
17#include <boost/tokenizer.hpp>
18#include <boost/lexical_cast.hpp>
19#include <boost/date_time/compiler_config.hpp>
20#include <boost/date_time/parse_format_base.hpp>
21#include <boost/date_time/period.hpp>
22
23#if defined(BOOST_DATE_TIME_NO_LOCALE)
24#include <cctype> // ::tolower(int)
25#else
26#include <locale> // std::tolower(char, locale)
27#endif
28
29namespace boost {
30namespace date_time {
31
32 //! A function to replace the std::transform( , , ,tolower) construct
33 /*! This function simply takes a string, and changes all the characters
34 * in that string to lowercase (according to the default system locale).
35 * In the event that a compiler does not support locales, the old
36 * C style tolower() is used.
37 */
38 inline
39 std::string
40 convert_to_lower(std::string inp)
41 {
42#if !defined(BOOST_DATE_TIME_NO_LOCALE)
43 const std::locale loc(std::locale::classic());
44#endif
45 std::string::size_type i = 0, n = inp.length();
46 for (; i < n; ++i) {
47 inp[i] =
48#if defined(BOOST_DATE_TIME_NO_LOCALE)
49 static_cast<char>(std::tolower(inp[i]));
50#else
51 // tolower and others were brought in to std for borland >= v564
52 // in compiler_config.hpp
53 std::tolower(c: inp[i], loc: loc);
54#endif
55 }
56 return inp;
57 }
58
59 //! Helper function for parse_date.
60 template<class month_type>
61 inline unsigned short
62 month_str_to_ushort(std::string const& s) {
63 if((s.at(n: 0) >= '0') && (s.at(n: 0) <= '9')) {
64 return boost::lexical_cast<unsigned short>(arg: s);
65 }
66 else {
67 std::string str = convert_to_lower(inp: s);
68 //c++98 support
69#if defined(BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX)
70 static std::map<std::string, unsigned short> month_map;
71 typedef std::map<std::string, unsigned short>::value_type vtype;
72 if( month_map.empty() ) {
73 month_map.insert( vtype("jan", static_cast<unsigned short>(1)) );
74 month_map.insert( vtype("january", static_cast<unsigned short>(1)) );
75 month_map.insert( vtype("feb", static_cast<unsigned short>(2)) );
76 month_map.insert( vtype("february", static_cast<unsigned short>(2)) );
77 month_map.insert( vtype("mar", static_cast<unsigned short>(3)) );
78 month_map.insert( vtype("march", static_cast<unsigned short>(3)) );
79 month_map.insert( vtype("apr", static_cast<unsigned short>(4)) );
80 month_map.insert( vtype("april", static_cast<unsigned short>(4)) );
81 month_map.insert( vtype("may", static_cast<unsigned short>(5)) );
82 month_map.insert( vtype("jun", static_cast<unsigned short>(6)) );
83 month_map.insert( vtype("june", static_cast<unsigned short>(6)) );
84 month_map.insert( vtype("jul", static_cast<unsigned short>(7)) );
85 month_map.insert( vtype("july", static_cast<unsigned short>(7)) );
86 month_map.insert( vtype("aug", static_cast<unsigned short>(8)) );
87 month_map.insert( vtype("august", static_cast<unsigned short>(8)) );
88 month_map.insert( vtype("sep", static_cast<unsigned short>(9)) );
89 month_map.insert( vtype("september", static_cast<unsigned short>(9)) );
90 month_map.insert( vtype("oct", static_cast<unsigned short>(10)) );
91 month_map.insert( vtype("october", static_cast<unsigned short>(10)) );
92 month_map.insert( vtype("nov", static_cast<unsigned short>(11)) );
93 month_map.insert( vtype("november", static_cast<unsigned short>(11)) );
94 month_map.insert( vtype("dec", static_cast<unsigned short>(12)) );
95 month_map.insert( vtype("december", static_cast<unsigned short>(12)) );
96 }
97#else //c+11 and beyond
98 static std::map<std::string, unsigned short> month_map =
99 { { "jan", static_cast<unsigned short>(1) }, { "january", static_cast<unsigned short>(1) },
100 { "feb", static_cast<unsigned short>(2) }, { "february", static_cast<unsigned short>(2) },
101 { "mar", static_cast<unsigned short>(3) }, { "march", static_cast<unsigned short>(3) },
102 { "apr", static_cast<unsigned short>(4) }, { "april", static_cast<unsigned short>(4) },
103 { "may", static_cast<unsigned short>(5) },
104 { "jun", static_cast<unsigned short>(6) }, { "june", static_cast<unsigned short>(6) },
105 { "jul", static_cast<unsigned short>(7) }, { "july", static_cast<unsigned short>(7) },
106 { "aug", static_cast<unsigned short>(8) }, { "august", static_cast<unsigned short>(8) },
107 { "sep", static_cast<unsigned short>(9) }, { "september", static_cast<unsigned short>(9) },
108 { "oct", static_cast<unsigned short>(10) }, { "october", static_cast<unsigned short>(10)},
109 { "nov", static_cast<unsigned short>(11) }, { "november", static_cast<unsigned short>(11)},
110 { "dec", static_cast<unsigned short>(12) }, { "december", static_cast<unsigned short>(12)}
111 };
112#endif
113 std::map<std::string, unsigned short>::const_iterator mitr = month_map.find( x: str );
114 if ( mitr != month_map.end() ) {
115 return mitr->second;
116 }
117 }
118 return 13; // intentionally out of range - name not found
119 }
120
121
122 //! Generic function to parse a delimited date (eg: 2002-02-10)
123 /*! Accepted formats are: "2003-02-10" or " 2003-Feb-10" or
124 * "2003-Feburary-10"
125 * The order in which the Month, Day, & Year appear in the argument
126 * string can be accomodated by passing in the appropriate ymd_order_spec
127 */
128 template<class date_type>
129 date_type
130 parse_date(const std::string& s, int order_spec = ymd_order_iso) {
131 std::string spec_str;
132 if(order_spec == ymd_order_iso) {
133 spec_str = "ymd";
134 }
135 else if(order_spec == ymd_order_dmy) {
136 spec_str = "dmy";
137 }
138 else { // (order_spec == ymd_order_us)
139 spec_str = "mdy";
140 }
141
142 typedef typename date_type::month_type month_type;
143 unsigned pos = 0;
144 unsigned short year(0), month(0), day(0);
145 typedef typename std::basic_string<char>::traits_type traits_type;
146 typedef boost::char_separator<char, traits_type> char_separator_type;
147 typedef boost::tokenizer<char_separator_type,
148 std::basic_string<char>::const_iterator,
149 std::basic_string<char> > tokenizer;
150 typedef boost::tokenizer<char_separator_type,
151 std::basic_string<char>::const_iterator,
152 std::basic_string<char> >::iterator tokenizer_iterator;
153 // may need more delimiters, these work for the regression tests
154 const char sep_char[] = {',','-','.',' ','/','\0'};
155 char_separator_type sep(sep_char);
156 tokenizer tok(s,sep);
157 for(tokenizer_iterator beg=tok.begin();
158 beg!=tok.end() && pos < spec_str.size();
159 ++beg, ++pos) {
160 switch(spec_str.at(n: pos)) {
161 case 'y':
162 {
163 year = boost::lexical_cast<unsigned short>(arg: *beg);
164 break;
165 }
166 case 'm':
167 {
168 month = month_str_to_ushort<month_type>(*beg);
169 break;
170 }
171 case 'd':
172 {
173 day = boost::lexical_cast<unsigned short>(arg: *beg);
174 break;
175 }
176 default: break;
177 } //switch
178 }
179 return date_type(year, month, day);
180 }
181
182 //! Generic function to parse undelimited date (eg: 20020201)
183 template<class date_type>
184 date_type
185 parse_undelimited_date(const std::string& s) {
186 int offsets[] = {4,2,2};
187 int pos = 0;
188 //typename date_type::ymd_type ymd((year_type::min)(),1,1);
189 unsigned short y = 0, m = 0, d = 0;
190
191 /* The two bool arguments state that parsing will not wrap
192 * (only the first 8 characters will be parsed) and partial
193 * strings will not be parsed.
194 * Ex:
195 * "2005121" will parse 2005 & 12, but not the "1" */
196 boost::offset_separator osf(offsets, offsets+3, false, false);
197
198 typedef typename boost::tokenizer<boost::offset_separator,
199 std::basic_string<char>::const_iterator,
200 std::basic_string<char> > tokenizer_type;
201 tokenizer_type tok(s, osf);
202 for(typename tokenizer_type::iterator ti=tok.begin(); ti!=tok.end();++ti) {
203 unsigned short i = boost::lexical_cast<unsigned short>(arg: *ti);
204 switch(pos) {
205 case 0: y = i; break;
206 case 1: m = i; break;
207 case 2: d = i; break;
208 default: break;
209 }
210 pos++;
211 }
212 return date_type(y,m,d);
213 }
214
215 //! Helper function for 'date gregorian::from_stream()'
216 /*! Creates a string from the iterators that reference the
217 * begining & end of a char[] or string. All elements are
218 * used in output string */
219 template<class date_type, class iterator_type>
220 inline
221 date_type
222 from_stream_type(iterator_type& beg,
223 iterator_type const& end,
224 char)
225 {
226 std::ostringstream ss;
227 while(beg != end) {
228 ss << *beg++;
229 }
230 return parse_date<date_type>(ss.str());
231 }
232
233 //! Helper function for 'date gregorian::from_stream()'
234 /*! Returns the first string found in the stream referenced by the
235 * begining & end iterators */
236 template<class date_type, class iterator_type>
237 inline
238 date_type
239 from_stream_type(iterator_type& beg,
240 iterator_type const& /* end */,
241 std::string const&)
242 {
243 return parse_date<date_type>(*beg);
244 }
245
246 /* I believe the wchar stuff would be best elsewhere, perhaps in
247 * parse_date<>()? In the mean time this gets us started... */
248 //! Helper function for 'date gregorian::from_stream()'
249 /*! Creates a string from the iterators that reference the
250 * begining & end of a wstring. All elements are
251 * used in output string */
252 template<class date_type, class iterator_type>
253 inline
254 date_type from_stream_type(iterator_type& beg,
255 iterator_type const& end,
256 wchar_t)
257 {
258 std::ostringstream ss;
259#if !defined(BOOST_DATE_TIME_NO_LOCALE)
260 std::locale loc;
261 std::ctype<wchar_t> const& fac = std::use_facet<std::ctype<wchar_t> >(loc: loc);
262 while(beg != end) {
263 ss << fac.narrow(*beg++, 'X'); // 'X' will cause exception to be thrown
264 }
265#else
266 while(beg != end) {
267 char c = 'X'; // 'X' will cause exception to be thrown
268 const wchar_t wc = *beg++;
269 if (wc >= 0 && wc <= 127)
270 c = static_cast< char >(wc);
271 ss << c;
272 }
273#endif
274 return parse_date<date_type>(ss.str());
275 }
276#ifndef BOOST_NO_STD_WSTRING
277 //! Helper function for 'date gregorian::from_stream()'
278 /*! Creates a string from the first wstring found in the stream
279 * referenced by the begining & end iterators */
280 template<class date_type, class iterator_type>
281 inline
282 date_type
283 from_stream_type(iterator_type& beg,
284 iterator_type const& /* end */,
285 std::wstring const&) {
286 std::wstring ws = *beg;
287 std::ostringstream ss;
288 std::wstring::iterator wsb = ws.begin(), wse = ws.end();
289#if !defined(BOOST_DATE_TIME_NO_LOCALE)
290 std::locale loc;
291 std::ctype<wchar_t> const& fac = std::use_facet<std::ctype<wchar_t> >(loc: loc);
292 while(wsb != wse) {
293 ss << fac.narrow(c: *wsb++, dfault: 'X'); // 'X' will cause exception to be thrown
294 }
295#else
296 while(wsb != wse) {
297 char c = 'X'; // 'X' will cause exception to be thrown
298 const wchar_t wc = *wsb++;
299 if (wc >= 0 && wc <= 127)
300 c = static_cast< char >(wc);
301 ss << c;
302 }
303#endif
304 return parse_date<date_type>(ss.str());
305 }
306#endif // BOOST_NO_STD_WSTRING
307#if (defined(BOOST_MSVC) && (_MSC_VER < 1300))
308 // This function cannot be compiled with MSVC 6.0 due to internal compiler shorcomings
309#else
310 //! function called by wrapper functions: date_period_from_(w)string()
311 template<class date_type, class charT>
312 period<date_type, typename date_type::duration_type>
313 from_simple_string_type(const std::basic_string<charT>& s){
314 typedef typename std::basic_string<charT>::traits_type traits_type;
315 typedef typename boost::char_separator<charT, traits_type> char_separator;
316 typedef typename boost::tokenizer<char_separator,
317 typename std::basic_string<charT>::const_iterator,
318 std::basic_string<charT> > tokenizer;
319 const charT sep_list[4] = {'[','/',']','\0'};
320 char_separator sep(sep_list);
321 tokenizer tokens(s, sep);
322 typename tokenizer::iterator tok_it = tokens.begin();
323 std::basic_string<charT> date_string = *tok_it;
324 // get 2 string iterators and generate a date from them
325 typename std::basic_string<charT>::iterator date_string_start = date_string.begin(),
326 date_string_end = date_string.end();
327 typedef typename std::iterator_traits<typename std::basic_string<charT>::iterator>::value_type value_type;
328 date_type d1 = from_stream_type<date_type>(date_string_start, date_string_end, value_type());
329 date_string = *(++tok_it); // next token
330 date_string_start = date_string.begin(), date_string_end = date_string.end();
331 date_type d2 = from_stream_type<date_type>(date_string_start, date_string_end, value_type());
332 return period<date_type, typename date_type::duration_type>(d1, d2);
333 }
334#endif
335
336} } //namespace date_time
337
338
339
340
341#endif
342
343

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