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2 | #ifndef DATE_TIME_FORMAT_DATE_PARSER_HPP__ | |
3 | #define DATE_TIME_FORMAT_DATE_PARSER_HPP__ | |
4 | ||
5 | /* Copyright (c) 2004-2005 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/lexical_cast.hpp" | |
15 | #include "boost/date_time/string_parse_tree.hpp" | |
16 | #include "boost/date_time/strings_from_facet.hpp" | |
17 | #include "boost/date_time/special_values_parser.hpp" | |
18 | #include <string> | |
19 | #include <vector> | |
20 | #include <sstream> | |
21 | #include <iterator> | |
22 | #ifndef BOOST_NO_STDC_NAMESPACE | |
23 | # include <cctype> | |
24 | #else | |
25 | # include <ctype.h> | |
26 | #endif | |
27 | ||
28 | #ifdef BOOST_NO_STDC_NAMESPACE | |
29 | namespace std { | |
30 | using ::isspace; | |
31 | using ::isdigit; | |
32 | } | |
33 | #endif | |
34 | namespace boost { namespace date_time { | |
35 | ||
36 | //! Helper function for parsing fixed length strings into integers | |
37 | /*! Will consume 'length' number of characters from stream. Consumed | |
38 | * character are transfered to parse_match_result struct. | |
39 | * Returns '-1' if no number can be parsed or incorrect number of | |
40 | * digits in stream. */ | |
41 | template<typename int_type, typename charT> | |
42 | inline | |
43 | int_type | |
44 | fixed_string_to_int(std::istreambuf_iterator<charT>& itr, | |
45 | std::istreambuf_iterator<charT>& stream_end, | |
46 | parse_match_result<charT>& mr, | |
47 | unsigned int length, | |
48 | const charT& fill_char) | |
49 | { | |
50 | //typedef std::basic_string<charT> string_type; | |
51 | unsigned int j = 0; | |
52 | //string_type s; | |
53 | while (j < length && itr != stream_end && | |
54 | (std::isdigit(*itr) || *itr == fill_char)) { | |
55 | if(*itr == fill_char) { | |
56 | /* Since a fill_char can be anything, we convert it to a zero. | |
57 | * lexical_cast will behave predictably when zero is used as fill. */ | |
58 | mr.cache += ('0'); | |
59 | } | |
60 | else { | |
61 | mr.cache += (*itr); | |
62 | } | |
63 | itr++; | |
64 | j++; | |
65 | } | |
66 | int_type i = static_cast<int_type>(-1); | |
67 | // mr.cache will hold leading zeros. size() tells us when input is too short. | |
68 | if(mr.cache.size() < length) { | |
69 | return i; | |
70 | } | |
71 | try { | |
72 | i = boost::lexical_cast<int_type>(mr.cache); | |
73 | }catch(bad_lexical_cast&){ | |
74 | // we want to return -1 if the cast fails so nothing to do here | |
75 | } | |
76 | return i; | |
77 | } | |
78 | ||
79 | //! Helper function for parsing fixed length strings into integers | |
80 | /*! Will consume 'length' number of characters from stream. Consumed | |
81 | * character are transfered to parse_match_result struct. | |
82 | * Returns '-1' if no number can be parsed or incorrect number of | |
83 | * digits in stream. */ | |
84 | template<typename int_type, typename charT> | |
85 | inline | |
86 | int_type | |
87 | fixed_string_to_int(std::istreambuf_iterator<charT>& itr, | |
88 | std::istreambuf_iterator<charT>& stream_end, | |
89 | parse_match_result<charT>& mr, | |
90 | unsigned int length) | |
91 | { | |
92 | return fixed_string_to_int<int_type, charT>(itr, stream_end, mr, length, '0'); | |
93 | } | |
94 | ||
95 | //! Helper function for parsing varied length strings into integers | |
96 | /*! Will consume 'max_length' characters from stream only if those | |
97 | * characters are digits. Returns '-1' if no number can be parsed. | |
98 | * Will not parse a number preceeded by a '+' or '-'. */ | |
99 | template<typename int_type, typename charT> | |
100 | inline | |
101 | int_type | |
102 | var_string_to_int(std::istreambuf_iterator<charT>& itr, | |
103 | const std::istreambuf_iterator<charT>& stream_end, | |
104 | unsigned int max_length) | |
105 | { | |
106 | typedef std::basic_string<charT> string_type; | |
107 | unsigned int j = 0; | |
108 | string_type s; | |
109 | while (itr != stream_end && (j < max_length) && std::isdigit(*itr)) { | |
110 | s += (*itr); | |
111 | ++itr; | |
112 | ++j; | |
113 | } | |
114 | int_type i = static_cast<int_type>(-1); | |
115 | if(!s.empty()) { | |
116 | i = boost::lexical_cast<int_type>(s); | |
117 | } | |
118 | return i; | |
119 | } | |
120 | ||
121 | ||
122 | //! Class with generic date parsing using a format string | |
123 | /*! The following is the set of recognized format specifiers | |
124 | - %a - Short weekday name | |
125 | - %A - Long weekday name | |
126 | - %b - Abbreviated month name | |
127 | - %B - Full month name | |
128 | - %d - Day of the month as decimal 01 to 31 | |
129 | - %j - Day of year as decimal from 001 to 366 | |
130 | - %m - Month name as a decimal 01 to 12 | |
131 | - %U - Week number 00 to 53 with first Sunday as the first day of week 1? | |
132 | - %w - Weekday as decimal number 0 to 6 where Sunday == 0 | |
133 | - %W - Week number 00 to 53 where Monday is first day of week 1 | |
134 | - %x - facet default date representation | |
135 | - %y - Year without the century - eg: 04 for 2004 | |
136 | - %Y - Year with century | |
137 | ||
138 | The weekday specifiers (%a and %A) do not add to the date construction, | |
139 | but they provide a way to skip over the weekday names for formats that | |
140 | provide them. | |
141 | ||
142 | todo -- Another interesting feature that this approach could provide is | |
143 | an option to fill in any missing fields with the current values | |
144 | from the clock. So if you have %m-%d the parser would detect | |
145 | the missing year value and fill it in using the clock. | |
146 | ||
147 | todo -- What to do with the %x. %x in the classic facet is just bad... | |
148 | ||
149 | */ | |
150 | template<class date_type, typename charT> | |
151 | class format_date_parser | |
152 | { | |
153 | public: | |
154 | typedef std::basic_string<charT> string_type; | |
155 | typedef std::basic_istringstream<charT> stringstream_type; | |
156 | typedef std::istreambuf_iterator<charT> stream_itr_type; | |
157 | typedef typename string_type::const_iterator const_itr; | |
158 | typedef typename date_type::year_type year_type; | |
159 | typedef typename date_type::month_type month_type; | |
160 | typedef typename date_type::day_type day_type; | |
161 | typedef typename date_type::duration_type duration_type; | |
162 | typedef typename date_type::day_of_week_type day_of_week_type; | |
163 | typedef typename date_type::day_of_year_type day_of_year_type; | |
164 | typedef string_parse_tree<charT> parse_tree_type; | |
165 | typedef typename parse_tree_type::parse_match_result_type match_results; | |
166 | typedef std::vector<std::basic_string<charT> > input_collection_type; | |
167 | ||
168 | // TODO sv_parser uses its default constructor - write the others | |
169 | ||
170 | format_date_parser(const string_type& format_str, | |
171 | const input_collection_type& month_short_names, | |
172 | const input_collection_type& month_long_names, | |
173 | const input_collection_type& weekday_short_names, | |
174 | const input_collection_type& weekday_long_names) : | |
175 | m_format(format_str), | |
176 | m_month_short_names(month_short_names, 1), | |
177 | m_month_long_names(month_long_names, 1), | |
178 | m_weekday_short_names(weekday_short_names), | |
179 | m_weekday_long_names(weekday_long_names) | |
180 | {} | |
181 | ||
182 | format_date_parser(const string_type& format_str, | |
183 | const std::locale& locale) : | |
184 | m_format(format_str), | |
185 | m_month_short_names(gather_month_strings<charT>(locale), 1), | |
186 | m_month_long_names(gather_month_strings<charT>(locale, false), 1), | |
187 | m_weekday_short_names(gather_weekday_strings<charT>(locale)), | |
188 | m_weekday_long_names(gather_weekday_strings<charT>(locale, false)) | |
189 | {} | |
190 | ||
191 | format_date_parser(const format_date_parser<date_type,charT>& fdp) | |
192 | { | |
193 | this->m_format = fdp.m_format; | |
194 | this->m_month_short_names = fdp.m_month_short_names; | |
195 | this->m_month_long_names = fdp.m_month_long_names; | |
196 | this->m_weekday_short_names = fdp.m_weekday_short_names; | |
197 | this->m_weekday_long_names = fdp.m_weekday_long_names; | |
198 | } | |
199 | ||
200 | string_type format() const | |
201 | { | |
202 | return m_format; | |
203 | } | |
204 | ||
205 | void format(string_type format_str) | |
206 | { | |
207 | m_format = format_str; | |
208 | } | |
209 | ||
210 | void short_month_names(const input_collection_type& month_names) | |
211 | { | |
212 | m_month_short_names = parse_tree_type(month_names, 1); | |
213 | } | |
214 | void long_month_names(const input_collection_type& month_names) | |
215 | { | |
216 | m_month_long_names = parse_tree_type(month_names, 1); | |
217 | } | |
218 | void short_weekday_names(const input_collection_type& weekday_names) | |
219 | { | |
220 | m_weekday_short_names = parse_tree_type(weekday_names); | |
221 | } | |
222 | void long_weekday_names(const input_collection_type& weekday_names) | |
223 | { | |
224 | m_weekday_long_names = parse_tree_type(weekday_names); | |
225 | } | |
226 | ||
227 | date_type | |
228 | parse_date(const string_type& value, | |
229 | const string_type& format_str, | |
230 | const special_values_parser<date_type,charT>& sv_parser) const | |
231 | { | |
232 | stringstream_type ss(value); | |
233 | stream_itr_type sitr(ss); | |
234 | stream_itr_type stream_end; | |
235 | return parse_date(sitr, stream_end, format_str, sv_parser); | |
236 | } | |
237 | ||
238 | date_type | |
239 | parse_date(std::istreambuf_iterator<charT>& sitr, | |
240 | std::istreambuf_iterator<charT>& stream_end, | |
241 | const special_values_parser<date_type,charT>& sv_parser) const | |
242 | { | |
243 | return parse_date(sitr, stream_end, m_format, sv_parser); | |
244 | } | |
245 | ||
246 | /*! Of all the objects that the format_date_parser can parse, only a | |
247 | * date can be a special value. Therefore, only parse_date checks | |
248 | * for special_values. */ | |
249 | date_type | |
250 | parse_date(std::istreambuf_iterator<charT>& sitr, | |
251 | std::istreambuf_iterator<charT>& stream_end, | |
252 | string_type format_str, | |
253 | const special_values_parser<date_type,charT>& sv_parser) const | |
254 | { | |
255 | bool use_current_char = false; | |
256 | ||
257 | // skip leading whitespace | |
258 | while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; } | |
259 | ||
260 | short year(0), month(0), day(0), day_of_year(0);// wkday(0); | |
261 | /* Initialized the following to their minimum values. These intermediate | |
262 | * objects are used so we get specific exceptions when part of the input | |
263 | * is unparsable. | |
264 | * Ex: "205-Jan-15" will throw a bad_year, "2005-Jsn-15"- bad_month, etc.*/ | |
265 | year_type t_year(1400); | |
266 | month_type t_month(1); | |
267 | day_type t_day(1); | |
268 | day_of_week_type wkday(0); | |
269 | ||
270 | ||
271 | const_itr itr(format_str.begin()); | |
272 | while (itr != format_str.end() && (sitr != stream_end)) { | |
273 | if (*itr == '%') { | |
274 | if ( ++itr == format_str.end()) | |
275 | break; | |
276 | if (*itr != '%') { | |
277 | switch(*itr) { | |
278 | case 'a': | |
279 | { | |
280 | //this value is just throw away. It could be used for | |
281 | //error checking potentially, but it isn't helpful in | |
282 | //actually constructing the date - we just need to get it | |
283 | //out of the stream | |
284 | match_results mr = m_weekday_short_names.match(sitr, stream_end); | |
285 | if(mr.current_match == match_results::PARSE_ERROR) { | |
286 | // check special_values | |
287 | if(sv_parser.match(sitr, stream_end, mr)) { | |
288 | return date_type(static_cast<special_values>(mr.current_match)); | |
289 | } | |
290 | } | |
291 | wkday = mr.current_match; | |
292 | if (mr.has_remaining()) { | |
293 | use_current_char = true; | |
294 | } | |
295 | break; | |
296 | } | |
297 | case 'A': | |
298 | { | |
299 | //this value is just throw away. It could be used for | |
300 | //error checking potentially, but it isn't helpful in | |
301 | //actually constructing the date - we just need to get it | |
302 | //out of the stream | |
303 | match_results mr = m_weekday_long_names.match(sitr, stream_end); | |
304 | if(mr.current_match == match_results::PARSE_ERROR) { | |
305 | // check special_values | |
306 | if(sv_parser.match(sitr, stream_end, mr)) { | |
307 | return date_type(static_cast<special_values>(mr.current_match)); | |
308 | } | |
309 | } | |
310 | wkday = mr.current_match; | |
311 | if (mr.has_remaining()) { | |
312 | use_current_char = true; | |
313 | } | |
314 | break; | |
315 | } | |
316 | case 'b': | |
317 | { | |
318 | match_results mr = m_month_short_names.match(sitr, stream_end); | |
319 | if(mr.current_match == match_results::PARSE_ERROR) { | |
320 | // check special_values | |
321 | if(sv_parser.match(sitr, stream_end, mr)) { | |
322 | return date_type(static_cast<special_values>(mr.current_match)); | |
323 | } | |
324 | } | |
325 | t_month = month_type(mr.current_match); | |
326 | if (mr.has_remaining()) { | |
327 | use_current_char = true; | |
328 | } | |
329 | break; | |
330 | } | |
331 | case 'B': | |
332 | { | |
333 | match_results mr = m_month_long_names.match(sitr, stream_end); | |
334 | if(mr.current_match == match_results::PARSE_ERROR) { | |
335 | // check special_values | |
336 | if(sv_parser.match(sitr, stream_end, mr)) { | |
337 | return date_type(static_cast<special_values>(mr.current_match)); | |
338 | } | |
339 | } | |
340 | t_month = month_type(mr.current_match); | |
341 | if (mr.has_remaining()) { | |
342 | use_current_char = true; | |
343 | } | |
344 | break; | |
345 | } | |
346 | case 'd': | |
347 | { | |
348 | match_results mr; | |
349 | day = fixed_string_to_int<short, charT>(sitr, stream_end, mr, 2); | |
350 | if(day == -1) { | |
351 | if(sv_parser.match(sitr, stream_end, mr)) { | |
352 | return date_type(static_cast<special_values>(mr.current_match)); | |
353 | } | |
354 | } | |
355 | t_day = day_type(day); | |
356 | break; | |
357 | } | |
358 | case 'e': | |
359 | { | |
360 | match_results mr; | |
361 | day = fixed_string_to_int<short, charT>(sitr, stream_end, mr, 2, ' '); | |
362 | if(day == -1) { | |
363 | if(sv_parser.match(sitr, stream_end, mr)) { | |
364 | return date_type(static_cast<special_values>(mr.current_match)); | |
365 | } | |
366 | } | |
367 | t_day = day_type(day); | |
368 | break; | |
369 | } | |
370 | case 'j': | |
371 | { | |
372 | match_results mr; | |
373 | day_of_year = fixed_string_to_int<short, charT>(sitr, stream_end, mr, 3); | |
374 | if(day_of_year == -1) { | |
375 | if(sv_parser.match(sitr, stream_end, mr)) { | |
376 | return date_type(static_cast<special_values>(mr.current_match)); | |
377 | } | |
378 | } | |
379 | // these next two lines are so we get an exception with bad input | |
380 | day_of_year_type t_day_of_year(1); | |
381 | t_day_of_year = day_of_year_type(day_of_year); | |
382 | break; | |
383 | } | |
384 | case 'm': | |
385 | { | |
386 | match_results mr; | |
387 | month = fixed_string_to_int<short, charT>(sitr, stream_end, mr, 2); | |
388 | if(month == -1) { | |
389 | if(sv_parser.match(sitr, stream_end, mr)) { | |
390 | return date_type(static_cast<special_values>(mr.current_match)); | |
391 | } | |
392 | } | |
393 | t_month = month_type(month); | |
394 | break; | |
395 | } | |
396 | case 'Y': | |
397 | { | |
398 | match_results mr; | |
399 | year = fixed_string_to_int<short, charT>(sitr, stream_end, mr, 4); | |
400 | if(year == -1) { | |
401 | if(sv_parser.match(sitr, stream_end, mr)) { | |
402 | return date_type(static_cast<special_values>(mr.current_match)); | |
403 | } | |
404 | } | |
405 | t_year = year_type(year); | |
406 | break; | |
407 | } | |
408 | case 'y': | |
409 | { | |
410 | match_results mr; | |
411 | year = fixed_string_to_int<short, charT>(sitr, stream_end, mr, 2); | |
412 | if(year == -1) { | |
413 | if(sv_parser.match(sitr, stream_end, mr)) { | |
414 | return date_type(static_cast<special_values>(mr.current_match)); | |
415 | } | |
416 | } | |
417 | year += 2000; //make 2 digit years in this century | |
418 | t_year = year_type(year); | |
419 | break; | |
420 | } | |
421 | default: | |
422 | {} //ignore those we don't understand | |
423 | ||
424 | }//switch | |
425 | ||
426 | } | |
427 | else { // itr == '%', second consecutive | |
428 | sitr++; | |
429 | } | |
430 | ||
431 | itr++; //advance past format specifier | |
432 | } | |
433 | else { //skip past chars in format and in buffer | |
434 | itr++; | |
435 | if (use_current_char) { | |
436 | use_current_char = false; | |
437 | } | |
438 | else { | |
439 | sitr++; | |
440 | } | |
441 | } | |
442 | } | |
443 | ||
444 | if (day_of_year > 0) { | |
445 | date_type d(static_cast<unsigned short>(year-1),12,31); //end of prior year | |
446 | return d + duration_type(day_of_year); | |
447 | } | |
448 | ||
449 | return date_type(t_year, t_month, t_day); // exceptions were thrown earlier | |
450 | // if input was no good | |
451 | } | |
452 | ||
453 | //! Throws bad_month if unable to parse | |
454 | month_type | |
455 | parse_month(std::istreambuf_iterator<charT>& sitr, | |
456 | std::istreambuf_iterator<charT>& stream_end, | |
457 | string_type format_str) const | |
458 | { | |
459 | match_results mr; | |
460 | return parse_month(sitr, stream_end, format_str, mr); | |
461 | } | |
462 | ||
463 | //! Throws bad_month if unable to parse | |
464 | month_type | |
465 | parse_month(std::istreambuf_iterator<charT>& sitr, | |
466 | std::istreambuf_iterator<charT>& stream_end, | |
467 | string_type format_str, | |
468 | match_results& mr) const | |
469 | { | |
470 | bool use_current_char = false; | |
471 | ||
472 | // skip leading whitespace | |
473 | while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; } | |
474 | ||
475 | short month(0); | |
476 | ||
477 | const_itr itr(format_str.begin()); | |
478 | while (itr != format_str.end() && (sitr != stream_end)) { | |
479 | if (*itr == '%') { | |
480 | if ( ++itr == format_str.end()) | |
481 | break; | |
482 | if (*itr != '%') { | |
483 | switch(*itr) { | |
484 | case 'b': | |
485 | { | |
486 | mr = m_month_short_names.match(sitr, stream_end); | |
487 | month = mr.current_match; | |
488 | if (mr.has_remaining()) { | |
489 | use_current_char = true; | |
490 | } | |
491 | break; | |
492 | } | |
493 | case 'B': | |
494 | { | |
495 | mr = m_month_long_names.match(sitr, stream_end); | |
496 | month = mr.current_match; | |
497 | if (mr.has_remaining()) { | |
498 | use_current_char = true; | |
499 | } | |
500 | break; | |
501 | } | |
502 | case 'm': | |
503 | { | |
504 | month = var_string_to_int<short, charT>(sitr, stream_end, 2); | |
505 | // var_string_to_int returns -1 if parse failed. That will | |
506 | // cause a bad_month exception to be thrown so we do nothing here | |
507 | break; | |
508 | } | |
509 | default: | |
510 | {} //ignore those we don't understand | |
511 | ||
512 | }//switch | |
513 | ||
514 | } | |
515 | else { // itr == '%', second consecutive | |
516 | sitr++; | |
517 | } | |
518 | ||
519 | itr++; //advance past format specifier | |
520 | } | |
521 | else { //skip past chars in format and in buffer | |
522 | itr++; | |
523 | if (use_current_char) { | |
524 | use_current_char = false; | |
525 | } | |
526 | else { | |
527 | sitr++; | |
528 | } | |
529 | } | |
530 | } | |
531 | ||
532 | return month_type(month); // throws bad_month exception when values are zero | |
533 | } | |
534 | ||
535 | //! Expects 1 or 2 digits 1-31. Throws bad_day_of_month if unable to parse | |
536 | day_type | |
537 | parse_var_day_of_month(std::istreambuf_iterator<charT>& sitr, | |
538 | std::istreambuf_iterator<charT>& stream_end) const | |
539 | { | |
540 | // skip leading whitespace | |
541 | while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; } | |
542 | ||
543 | return day_type(var_string_to_int<short, charT>(sitr, stream_end, 2)); | |
544 | } | |
545 | //! Expects 2 digits 01-31. Throws bad_day_of_month if unable to parse | |
546 | day_type | |
547 | parse_day_of_month(std::istreambuf_iterator<charT>& sitr, | |
548 | std::istreambuf_iterator<charT>& stream_end) const | |
549 | { | |
550 | // skip leading whitespace | |
551 | while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; } | |
552 | ||
553 | //return day_type(var_string_to_int<short, charT>(sitr, stream_end, 2)); | |
554 | match_results mr; | |
555 | return day_type(fixed_string_to_int<short, charT>(sitr, stream_end, mr, 2)); | |
556 | } | |
557 | ||
558 | day_of_week_type | |
559 | parse_weekday(std::istreambuf_iterator<charT>& sitr, | |
560 | std::istreambuf_iterator<charT>& stream_end, | |
561 | string_type format_str) const | |
562 | { | |
563 | match_results mr; | |
564 | return parse_weekday(sitr, stream_end, format_str, mr); | |
565 | } | |
566 | day_of_week_type | |
567 | parse_weekday(std::istreambuf_iterator<charT>& sitr, | |
568 | std::istreambuf_iterator<charT>& stream_end, | |
569 | string_type format_str, | |
570 | match_results& mr) const | |
571 | { | |
572 | bool use_current_char = false; | |
573 | ||
574 | // skip leading whitespace | |
575 | while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; } | |
576 | ||
577 | short wkday(0); | |
578 | ||
579 | const_itr itr(format_str.begin()); | |
580 | while (itr != format_str.end() && (sitr != stream_end)) { | |
581 | if (*itr == '%') { | |
582 | if ( ++itr == format_str.end()) | |
583 | break; | |
584 | if (*itr != '%') { | |
585 | switch(*itr) { | |
586 | case 'a': | |
587 | { | |
588 | //this value is just throw away. It could be used for | |
589 | //error checking potentially, but it isn't helpful in | |
590 | //actually constructing the date - we just need to get it | |
591 | //out of the stream | |
592 | mr = m_weekday_short_names.match(sitr, stream_end); | |
593 | wkday = mr.current_match; | |
594 | if (mr.has_remaining()) { | |
595 | use_current_char = true; | |
596 | } | |
597 | break; | |
598 | } | |
599 | case 'A': | |
600 | { | |
601 | //this value is just throw away. It could be used for | |
602 | //error checking potentially, but it isn't helpful in | |
603 | //actually constructing the date - we just need to get it | |
604 | //out of the stream | |
605 | mr = m_weekday_long_names.match(sitr, stream_end); | |
606 | wkday = mr.current_match; | |
607 | if (mr.has_remaining()) { | |
608 | use_current_char = true; | |
609 | } | |
610 | break; | |
611 | } | |
612 | case 'w': | |
613 | { | |
614 | // weekday as number 0-6, Sunday == 0 | |
615 | wkday = var_string_to_int<short, charT>(sitr, stream_end, 2); | |
616 | break; | |
617 | } | |
618 | default: | |
619 | {} //ignore those we don't understand | |
620 | ||
621 | }//switch | |
622 | ||
623 | } | |
624 | else { // itr == '%', second consecutive | |
625 | sitr++; | |
626 | } | |
627 | ||
628 | itr++; //advance past format specifier | |
629 | } | |
630 | else { //skip past chars in format and in buffer | |
631 | itr++; | |
632 | if (use_current_char) { | |
633 | use_current_char = false; | |
634 | } | |
635 | else { | |
636 | sitr++; | |
637 | } | |
638 | } | |
639 | } | |
640 | ||
641 | return day_of_week_type(wkday); // throws bad_day_of_month exception | |
642 | // when values are zero | |
643 | } | |
644 | ||
645 | //! throws bad_year if unable to parse | |
646 | year_type | |
647 | parse_year(std::istreambuf_iterator<charT>& sitr, | |
648 | std::istreambuf_iterator<charT>& stream_end, | |
649 | string_type format_str) const | |
650 | { | |
651 | match_results mr; | |
652 | return parse_year(sitr, stream_end, format_str, mr); | |
653 | } | |
654 | ||
655 | //! throws bad_year if unable to parse | |
656 | year_type | |
657 | parse_year(std::istreambuf_iterator<charT>& sitr, | |
658 | std::istreambuf_iterator<charT>& stream_end, | |
659 | string_type format_str, | |
660 | match_results& mr) const | |
661 | { | |
662 | bool use_current_char = false; | |
663 | ||
664 | // skip leading whitespace | |
665 | while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; } | |
666 | ||
667 | unsigned short year(0); | |
668 | ||
669 | const_itr itr(format_str.begin()); | |
670 | while (itr != format_str.end() && (sitr != stream_end)) { | |
671 | if (*itr == '%') { | |
672 | if ( ++itr == format_str.end()) | |
673 | break; | |
674 | if (*itr != '%') { | |
675 | //match_results mr; | |
676 | switch(*itr) { | |
677 | case 'Y': | |
678 | { | |
679 | // year from 4 digit string | |
680 | year = fixed_string_to_int<short, charT>(sitr, stream_end, mr, 4); | |
681 | break; | |
682 | } | |
683 | case 'y': | |
684 | { | |
685 | // year from 2 digit string (no century) | |
686 | year = fixed_string_to_int<short, charT>(sitr, stream_end, mr, 2); | |
687 | year += 2000; //make 2 digit years in this century | |
688 | break; | |
689 | } | |
690 | default: | |
691 | {} //ignore those we don't understand | |
692 | ||
693 | }//switch | |
694 | ||
695 | } | |
696 | else { // itr == '%', second consecutive | |
697 | sitr++; | |
698 | } | |
699 | ||
700 | itr++; //advance past format specifier | |
701 | } | |
702 | else { //skip past chars in format and in buffer | |
703 | itr++; | |
704 | if (use_current_char) { | |
705 | use_current_char = false; | |
706 | } | |
707 | else { | |
708 | sitr++; | |
709 | } | |
710 | } | |
711 | } | |
712 | ||
713 | return year_type(year); // throws bad_year exception when values are zero | |
714 | } | |
715 | ||
716 | ||
717 | private: | |
718 | string_type m_format; | |
719 | parse_tree_type m_month_short_names; | |
720 | parse_tree_type m_month_long_names; | |
721 | parse_tree_type m_weekday_short_names; | |
722 | parse_tree_type m_weekday_long_names; | |
723 | ||
724 | }; | |
725 | ||
726 | } } //namespace | |
727 | ||
728 | #endif | |
729 | ||
730 | ||
731 |