Annotation of parser3/src/types/pa_vdate.C, revision 1.5
1.1 moko 1: /** @file
2: Parser: @b date parser class.
3:
4: Copyright (c) 2001-2012 Art. Lebedev Studio (http://www.artlebedev.com)
5: */
6:
7: #include "pa_vstateless_object.h"
8: #include "pa_vdate.h"
9: #include "pa_vint.h"
10: #include "pa_vstring.h"
11:
1.5 ! moko 12: volatile const char * IDENT_PA_PA_VDATE_C="$Id: pa_vdate.C,v 1.4 2015/09/03 16:25:05 moko Exp $" IDENT_PA_VDATE_H;
1.1 moko 13:
1.4 moko 14: #define ZERO_DATE (-62169984000ll-SECS_PER_DAY) // '0000-00-00 00:00:00' - 1 day
15: #define MAX_DATE (253402300799ll+SECS_PER_DAY) // '9999-12-31 23:59:59' + 1 day
1.3 moko 16:
17: #define MAX_32_DATE 2147483647
18:
19: static const int DAYS_IN_MONTH[12] =
20: {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
21:
22: static const int DAYS_BEFORE_MONTH[12] =
23: {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334};
24:
25: #define IS_LEAP(y) (((y) % 4) == 0 && (((y) % 100) != 0 || (((y)+1900) % 400) == 0))
26:
27: int VDate::getMonthDays(int year, int month) {
28: return (month == 1 /* january -- 0 */ && IS_LEAP(year)) ? 29 : DAYS_IN_MONTH[month];
29: }
30:
31: static void pa_gmtime(pa_time_t lcltime, struct tm *res);
32: static pa_time_t pa_mktime(struct tm *tim_p);
33:
34: static int gmt_offset() {
35: #if defined(HAVE_TIMEZONE)
36: tzset();
37: return timezone;
38: #else
39: time_t t=time(0);
40: tm *tm=localtime(&t);
41: #if defined(HAVE_TM_GMTOFF)
42: return -tm->tm_gmtoff;
43: #elif defined(HAVE_TM_TZADJ)
44: return tm->tm_tzadj;
45: #else
46: #error neither HAVE_TIMEZONE nor HAVE_TM_GMTOFF nor HAVE_TM_TZADJ defined
47: #endif
48: #endif
49: }
50:
51: static void pa_set_tz(const char* ntz) {
52: if(ntz && *ntz){
53: static char temp_tz_pair[MAX_STRING];
54: snprintf(temp_tz_pair, sizeof(temp_tz_pair), "TZ=%s", ntz);
55: putenv(temp_tz_pair);
56: } else {
1.1 moko 57: #ifdef HAVE_UNSETENV
1.3 moko 58: unsetenv("TZ");
1.1 moko 59: #else
1.3 moko 60: putenv("TZ=");
1.1 moko 61: #endif
1.3 moko 62: }
1.1 moko 63: }
64:
1.3 moko 65: /// Auto-object used for temporarily substituting/removing timezone variable
66: class Temp_tz {
67: const char* ntz;
68: char saved_tz[MAX_STRING];
69: public:
70: static const char *default_tz;
71: public:
72: Temp_tz(const char *atz) : ntz(atz) {
73: if(!ntz)
74: ntz=default_tz;
75: if(!ntz)
76: return;
77: if(const char* ctz=getenv("TZ")){
78: strncpy(saved_tz, ctz, sizeof(saved_tz)-1);
79: } else
80: saved_tz[0]=0;
81: pa_set_tz(ntz);
82: }
83: ~Temp_tz() {
84: if(ntz)
85: pa_set_tz(saved_tz);
86: }
87: };
88:
89: const char *Temp_tz::default_tz=0;
1.1 moko 90:
1.3 moko 91: static tm pa_localtime(const char *tz, pa_time_t atime, struct tm &tmIn) {
92: Temp_tz temp_tz(tz);
93: #ifdef PA_DATE64
94: tmIn=*localtime(&atime);
95: #else
96: if(atime >= 0 && atime <= MAX_32_DATE){
1.5 ! moko 97: time_t itime=(time_t)atime;
1.3 moko 98: tmIn=*localtime(&itime);
99: } else {
100: pa_gmtime(atime-gmt_offset(), &tmIn);
101: }
102: #endif
1.1 moko 103: }
104:
1.3 moko 105: static pa_time_t pa_mktime(const char *tz, struct tm &tmIn) {
106: Temp_tz temp_tz(tz);
107: #ifdef PA_DATE64
108: return mktime(&tmIn);
109: #else
110: time_t result=mktime(&tmIn);
111: if(result != -1)
112: return result;
113: return pa_mktime(&tmIn)+gmt_offset();
114: #endif
1.1 moko 115: }
116:
1.3 moko 117: const String* VDate::get_sql_string(sql_string_type format) {
118: switch(format){
119: case sql_string_datetime:{
120: static const char *format="%.4d-%.2d-%.2d %.2d:%.2d:%.2d";
121: static int size=4+1+2+1+2 +1+ 2+1+2+1+2 +1/*zero-teminator*/+1/*for faulty snprintfs*/;
122: char *buf=new(PointerFreeGC) char[size];
123: snprintf(buf, size, format, ftm.tm_year+1900, ftm.tm_mon+1, ftm.tm_mday, ftm.tm_hour, ftm.tm_min, ftm.tm_sec);
124: return new String(buf);
125: }
126: case sql_string_date:{
127: static const char *format="%.4d-%.2d-%.2d";
128: static int size=4+1+2+1+2 +1/*zero-teminator*/+1/*for faulty snprintfs*/;
129: char *buf=new(PointerFreeGC) char[size];
130: snprintf(buf, size, format, ftm.tm_year+1900, ftm.tm_mon+1, ftm.tm_mday);
131: return new String(buf);
132: }
133: case sql_string_time:{
134: static const char *format="%.2d:%.2d:%.2d";
135: static int size=2+1+2+1+2 +1/*zero-teminator*/+1/*for faulty snprintfs*/;
136: char *buf=new(PointerFreeGC) char[size];
137: snprintf(buf, size, format, ftm.tm_hour, ftm.tm_min, ftm.tm_sec);
138: return new String(buf);
139: }
1.1 moko 140: }
1.3 moko 141: }
142:
143:
144: const String* VDate::get_gmt_string() {
145: struct tm tms;
146: #ifdef PA_DATE64
147: tms=*gmtime(&ftime);
148: #else
149: pa_gmtime(ftime, &tms);
150: #endif
151:
152: /// http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.3
153: static const char month_names[12][4]={"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"};
154: static const char days[7][4]={"Sun","Mon","Tue","Wed","Thu","Fri","Sat"};
1.1 moko 155:
1.3 moko 156: static int size=3+1+1+2+1+3+1+4+1+2+1+2+1+2+4 +1/*zero-teminator*/+1/*for faulty snprintfs*/;
157: char *buf=new(PointerFreeGC) char[size];
158: snprintf(buf, size, "%s, %.2d %s %.4d %.2d:%.2d:%.2d GMT",
159: days[tms.tm_wday], tms.tm_mday, month_names[tms.tm_mon], tms.tm_year+1900, tms.tm_hour, tms.tm_min, tms.tm_sec);
160: return new String(buf);
1.1 moko 161: }
162:
163: override Value* VDate::get_element(const String& aname) {
164: // $method
165: if(Value* result=VStateless_object::get_element(aname))
166: return result;
167:
168: // $TZ
1.3 moko 169: if(aname=="TZ")
170: return ftz_cstr ? new VString(*new String(ftz_cstr)): new VString();
1.1 moko 171:
172: int result;
1.3 moko 173: if(aname=="year") result=1900+ftm.tm_year;
174: else if(aname=="month") result=1+ftm.tm_mon;
175: else if(aname=="day") result=ftm.tm_mday;
176: else if(aname=="hour") result=ftm.tm_hour;
177: else if(aname=="minute") result=ftm.tm_min;
178: else if(aname=="second") result=ftm.tm_sec;
179: else if(aname=="weekday") result=ftm.tm_wday;
180: else if(aname=="yearday") result=ftm.tm_yday;
181: else if(aname=="daylightsaving") result=ftm.tm_isdst;
1.1 moko 182: else if(aname=="week") {
1.3 moko 183: yw week = CalcWeek(ftm);
1.1 moko 184: result=week.week;
185: }
186: else if(aname=="weekyear") {
1.3 moko 187: yw week = CalcWeek(ftm);
1.1 moko 188: result=1900+week.year;
189: } else { return bark("%s field not found", &aname); }
190: return new VInt(result);
191: }
192:
193: const String* VDate::get_json_string(Json_options& options) {
194: String* result=new String();
195: switch(options.date){
196: case Json_options::D_SQL:
197: result->append_quoted(get_sql_string());
198: break;
199: case Json_options::D_GMT:
200: result->append_quoted(get_gmt_string());
201: break;
202: case Json_options::D_TIMESTAMP:
203: *result << format((int)ftime, 0);
204: break;
205: }
206: return result;
207: }
1.2 moko 208:
1.3 moko 209: void VDate::validate() {
210: if((ftm.tm_year==-1901) && (ftm.tm_mon==10) && (ftm.tm_mday==30)){
211: ftm.tm_year=-1900;
212: ftm.tm_mon=-1;
213: ftm.tm_mday=0;
214: }
215: if((ftm.tm_year+1900)<0 || (ftm.tm_year+1900)>9999){
216: throw Exception(DATE_RANGE_EXCEPTION_TYPE, 0, "year '%d' is out of range 0..9999", ftm.tm_year+1900);
217: }
218: }
219:
220: void VDate::set_time(pa_time_t atime) {
1.2 moko 221: if(atime==-1)
222: throw Exception(DATE_RANGE_EXCEPTION_TYPE, 0, "invalid datetime");
1.3 moko 223: if(atime<ZERO_DATE || atime>MAX_DATE)
224: throw Exception(DATE_RANGE_EXCEPTION_TYPE, 0, "unix time %.15g is out of range 0..9999 year", (double)atime);
1.2 moko 225: ftime=atime;
1.3 moko 226: pa_localtime(ftz_cstr, ftime, ftm);
227: validate();
228: }
229:
230: void VDate::set_tm(tm &tmIn) {
1.4 moko 231: pa_time_t atime=pa_mktime(ftz_cstr, tmIn);
232: if(atime==-1)
233: throw Exception(DATE_RANGE_EXCEPTION_TYPE, 0, "invalid datetime '%04d-%02d-%02d'", tmIn.tm_year+1900, tmIn.tm_mon+1, tmIn.tm_mday);
234: ftime=atime;
1.3 moko 235: ftm=tmIn;
236: validate();
1.2 moko 237: }
238:
1.3 moko 239: void VDate::set_tz(const String* atz) {
240: ftz_cstr=atz && !atz->is_empty() ? atz->cstr() : 0;
241: pa_localtime(ftz_cstr, ftime, ftm);
242: validate();
243: }
244:
245: void VDate::set_default_tz(const String* atz) {
246: Temp_tz::default_tz=atz && !atz->is_empty() ? atz->cstr() : 0;
1.2 moko 247: }
248:
249: static int ISOWeekCount (int year) {
250: static const unsigned int YearWeeks[] = {
251: 52,52,52,52,53, 52,52,52,52,52,
252: 53,52,52,52,52, 52,53,52,52,52,
253: 52,53,52,52,52, 52,52,53
254: };
255: return YearWeeks[(year+1900) % 28];
256: }
257:
258: VDate::yw VDate::CalcWeek(tm& tms) {
259: yw week = {tms.tm_year, 0};
260:
261: // http://www.merlyn.demon.co.uk/weekinfo.htm
262: static const unsigned int FirstThurs[] = {7,5,4,3,2,7,6,5,4,2,1,7,6,4,3,2,1,6,5,4,3,1,7,6,5,3,2,1};
263: int diff = tms.tm_yday-(FirstThurs[(tms.tm_year+1900) % 28]-4);
264: if (diff < 0){
265: tms.tm_mday = diff;
1.3 moko 266: pa_mktime(0, tms); // normalize
1.2 moko 267: week = CalcWeek(tms);
268: } else {
269: week.week = 1 + diff/7;
270: if ( week.week > 52 && ISOWeekCount(week.year) < week.week ){
271: week.year++;
272: week.week = 1;
273: }
274: }
275: return week;
276: }
1.3 moko 277:
278: #ifndef PA_DATE64
279:
280: /*
281: * gmtime_r.c
282: * Original Author: Adapted from tzcode maintained by Arthur David Olson.
283: * Modifications:
284: * - Changed to mktm_r and added __tzcalc_limits - 04/10/02, Jeff Johnston
285: * - Fixed bug in mday computations - 08/12/04, Alex Mogilnikov <alx@intellectronika.ru>
286: * - Fixed bug in __tzcalc_limits - 08/12/04, Alex Mogilnikov <alx@intellectronika.ru>
287: * - Move code from _mktm_r() to gmtime_r() - 05/09/14, Freddie Chopin <freddie_chopin@op.pl>
288: * - Fixed bug in calculations for dates after year 2069 or before year 1901. Ideas for
289: * solution taken from musl's __secs_to_tm() - 07/12/2014, Freddie Chopin
290: * <freddie_chopin@op.pl>
291: * - Use faster algorithm from civil_from_days() by Howard Hinnant - 12/06/2014,
292: * Freddie Chopin <freddie_chopin@op.pl>
293: *
294: * Converts the calendar time pointed to by tim_p into a broken-down time
295: * expressed as local time. Returns a pointer to a structure containing the
296: * broken-down time.
297: */
298:
299: /* Move epoch from 01.01.1970 to 01.03.0000 (yes, Year 0) - this is the first
300: * day of a 400-year long "era", right after additional day of leap year.
301: * This adjustment is required only for date calculation, so instead of
302: * modifying time_t value (which would require 64-bit operations to work
303: * correctly) it's enough to adjust the calculated number of days since epoch.
304: */
305:
306: #define SECS_PER_HOUR 3600
307: #define SECS_PER_MIN 60
308: #define DAYS_PER_WEEK 7
309: #define YEAR_BASE 1900
310:
311: #define EPOCH_ADJUSTMENT_DAYS 719468L
312: /* year to which the adjustment was made */
313: #define ADJUSTED_EPOCH_YEAR 0
314: /* 1st March of year 0 is Wednesday */
315: #define ADJUSTED_EPOCH_WDAY 3
316: /* there are 97 leap years in 400-year periods. ((400 - 97) * 365 + 97 * 366) */
317: #define DAYS_PER_ERA 146097L
318: /* there are 24 leap years in 100-year periods. ((100 - 24) * 365 + 24 * 366) */
319: #define DAYS_PER_CENTURY 36524L
320: /* there is one leap year every 4 years */
321: #define DAYS_PER_4_YEARS (3 * 365 + 366)
322: /* number of days in a non-leap year */
323: #define DAYS_PER_YEAR 365
324: /* number of days in January */
325: #define DAYS_IN_JANUARY 31
326: /* number of days in non-leap February */
327: #define DAYS_IN_FEBRUARY 28
328: /* number of years per era */
329: #define YEARS_PER_ERA 400
330:
331: static void pa_gmtime(pa_time_t lcltime, struct tm *res) {
332: long days, rem;
333: int era, weekday, year;
334: unsigned erayear, yearday, month, day;
335: unsigned long eraday;
336:
1.5 ! moko 337: days = (long)(lcltime / SECS_PER_DAY);
! 338: rem = (long)(lcltime - (pa_time_t)days * SECS_PER_DAY);
1.3 moko 339: days += EPOCH_ADJUSTMENT_DAYS;
340: if (rem < 0)
341: {
342: rem += SECS_PER_DAY;
343: --days;
344: }
345:
346: /* compute hour, min, and sec */
347: res->tm_hour = (int) (rem / SECS_PER_HOUR);
348: rem %= SECS_PER_HOUR;
349: res->tm_min = (int) (rem / SECS_PER_MIN);
350: res->tm_sec = (int) (rem % SECS_PER_MIN);
351:
352: /* compute day of week */
353: if ((weekday = ((ADJUSTED_EPOCH_WDAY + days) % DAYS_PER_WEEK)) < 0)
354: weekday += DAYS_PER_WEEK;
355: res->tm_wday = weekday;
356:
357: /* compute year, month, day & day of year */
358: /* for description of this algorithm see
359: * http://howardhinnant.github.io/date_algorithms.html#civil_from_days */
360: era = (days >= 0 ? days : days - (DAYS_PER_ERA - 1)) / DAYS_PER_ERA;
361: eraday = days - era * DAYS_PER_ERA; /* [0, 146096] */
362: erayear = (eraday - eraday / (DAYS_PER_4_YEARS - 1) + eraday / DAYS_PER_CENTURY -
363: eraday / (DAYS_PER_ERA - 1)) / 365; /* [0, 399] */
364: yearday = eraday - (DAYS_PER_YEAR * erayear + erayear / 4 - erayear / 100); /* [0, 365] */
365: month = (5 * yearday + 2) / 153; /* [0, 11] */
366: day = yearday - (153 * month + 2) / 5 + 1; /* [1, 31] */
367: month += month < 10 ? 2 : -10;
368: year = ADJUSTED_EPOCH_YEAR + erayear + era * YEARS_PER_ERA + (month <= 1);
369:
370: res->tm_yday = yearday >= DAYS_PER_YEAR - DAYS_IN_JANUARY - DAYS_IN_FEBRUARY ?
371: yearday - (DAYS_PER_YEAR - DAYS_IN_JANUARY - DAYS_IN_FEBRUARY) :
372: yearday + DAYS_IN_JANUARY + DAYS_IN_FEBRUARY + IS_LEAP(erayear);
373: res->tm_year = year - YEAR_BASE;
374: res->tm_mon = month;
375: res->tm_mday = day;
376:
377: res->tm_isdst = 0;
378: }
379:
380:
381: /*
382: * mktime.c
383: * Original Author: G. Haley
384: *
385: * Converts the broken-down time, expressed as local time, in the structure
386: * pointed to by tim_p into a calendar time value. The original values of the
387: * tm_wday and tm_yday fields of the structure are ignored, and the original
388: * values of the other fields have no restrictions. On successful completion
389: * the fields of the structure are set to represent the specified calendar
390: * time. Returns the specified calendar time. If the calendar time can not be
391: * represented, returns the value (time_t) -1.
392: */
393:
394: #define _DAYS_IN_MONTH(x) ((x == 1) ? days_in_feb : DAYS_IN_MONTH[x])
395: #define _DAYS_IN_YEAR(year) (IS_LEAP(year) ? 366 : 365)
396:
397: static void validate_structure(struct tm *tim_p) {
398: div_t res;
399: int days_in_feb = 28;
400:
401: /* calculate time & date to account for out of range values */
402: if (tim_p->tm_sec < 0 || tim_p->tm_sec > 59)
403: {
404: res = div (tim_p->tm_sec, 60);
405: tim_p->tm_min += res.quot;
406: if ((tim_p->tm_sec = res.rem) < 0)
407: {
408: tim_p->tm_sec += 60;
409: --tim_p->tm_min;
410: }
411: }
412:
413: if (tim_p->tm_min < 0 || tim_p->tm_min > 59)
414: {
415: res = div (tim_p->tm_min, 60);
416: tim_p->tm_hour += res.quot;
417: if ((tim_p->tm_min = res.rem) < 0)
418: {
419: tim_p->tm_min += 60;
420: --tim_p->tm_hour;
421: }
422: }
423:
424: if (tim_p->tm_hour < 0 || tim_p->tm_hour > 23)
425: {
426: res = div (tim_p->tm_hour, 24);
427: tim_p->tm_mday += res.quot;
428: if ((tim_p->tm_hour = res.rem) < 0)
429: {
430: tim_p->tm_hour += 24;
431: --tim_p->tm_mday;
432: }
433: }
434:
435: if (tim_p->tm_mon < 0 || tim_p->tm_mon > 11)
436: {
437: res = div (tim_p->tm_mon, 12);
438: tim_p->tm_year += res.quot;
439: if ((tim_p->tm_mon = res.rem) < 0)
440: {
441: tim_p->tm_mon += 12;
442: --tim_p->tm_year;
443: }
444: }
445:
446: if (_DAYS_IN_YEAR (tim_p->tm_year) == 366)
447: days_in_feb = 29;
448:
449: if (tim_p->tm_mday <= 0)
450: {
451: while (tim_p->tm_mday <= 0)
452: {
453: if (--tim_p->tm_mon == -1)
454: {
455: tim_p->tm_year--;
456: tim_p->tm_mon = 11;
457: days_in_feb =
458: ((_DAYS_IN_YEAR (tim_p->tm_year) == 366) ?
459: 29 : 28);
460: }
461: tim_p->tm_mday += _DAYS_IN_MONTH (tim_p->tm_mon);
462: }
463: }
464: else
465: {
466: while (tim_p->tm_mday > _DAYS_IN_MONTH (tim_p->tm_mon))
467: {
468: tim_p->tm_mday -= _DAYS_IN_MONTH (tim_p->tm_mon);
469: if (++tim_p->tm_mon == 12)
470: {
471: tim_p->tm_year++;
472: tim_p->tm_mon = 0;
473: days_in_feb =
474: ((_DAYS_IN_YEAR (tim_p->tm_year) == 366) ?
475: 29 : 28);
476: }
477: }
478: }
479: }
480:
481: static pa_time_t pa_mktime(struct tm *tim_p) {
482: pa_time_t tim = 0;
483: long days = 0;
484: int year;
485:
486: /* validate structure */
487: validate_structure (tim_p);
488:
489: /* compute hours, minutes, seconds */
490: tim += tim_p->tm_sec + (tim_p->tm_min * SECS_PER_MIN) +
491: (tim_p->tm_hour * SECS_PER_HOUR);
492:
493: /* compute days in year */
494: days += tim_p->tm_mday - 1;
495: days += DAYS_BEFORE_MONTH[tim_p->tm_mon];
496: if (tim_p->tm_mon > 1 && _DAYS_IN_YEAR (tim_p->tm_year) == 366)
497: days++;
498:
499: /* compute day of the year */
500: tim_p->tm_yday = days;
501:
502: if (tim_p->tm_year > 10000 || tim_p->tm_year < -10000)
503: return (time_t) -1;
504:
505: /* compute days in other years */
506: if ((year = tim_p->tm_year) > 70)
507: {
508: for (year = 70; year < tim_p->tm_year; year++)
509: days += _DAYS_IN_YEAR (year);
510: }
511: else if (year < 70)
512: {
513: for (year = 69; year > tim_p->tm_year; year--)
514: days -= _DAYS_IN_YEAR (year);
515: days -= _DAYS_IN_YEAR (year);
516: }
517:
518: /* compute total seconds */
519: tim += (pa_time_t)days * SECS_PER_DAY;
520:
521: /* compute day of the week */
522: if ((tim_p->tm_wday = (days + 4) % 7) < 0)
523: tim_p->tm_wday += 7;
524:
525: return tim;
526: }
527:
528: #endif
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