Annotation of parser3/src/types/pa_vdate.h, revision 1.50
1.1 parser 1: /** @file
2: Parser: @b date parser class decl.
3:
1.48 misha 4: Copyright (c) 2001-2009 ArtLebedev Group (http://www.artlebedev.com)
1.8 paf 5: Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
1.1 parser 6: */
7:
8: #ifndef PA_VDATE_H
9: #define PA_VDATE_H
1.11 paf 10:
1.50 ! misha 11: static const char * const IDENT_VDATE_H="$Date: 2009-08-08 13:30:21 $";
1.1 parser 12:
13: #include "classes.h"
14: #include "pa_common.h"
15: #include "pa_vstateless_object.h"
16: #include "pa_vint.h"
17:
1.9 paf 18: // defines
19:
20: #define VDATE_TYPE "date"
1.20 paf 21:
1.9 paf 22: // externs
23:
1.25 paf 24: extern Methoded* date_class;
1.1 parser 25:
1.27 paf 26: inline void set_tz(const char* tz, char* buf, size_t buf_size) {
1.43 paf 27: #ifndef WIN32
28: if(tz && *tz){
29: #endif
30: snprintf(buf, buf_size, "TZ=%s", tz);
31: putenv(buf);
32: #ifndef WIN32
33: } else
1.45 misha 34: #ifdef HAVE_UNSETENV
35: unsetenv("TZ");
36: #else
1.43 paf 37: putenv("TZ");
38: #endif
1.45 misha 39: #endif
1.27 paf 40: tzset();
41: }
42:
1.1 parser 43: /// value of type 'date'. implemented with @c time_t
1.25 paf 44: class VDate: public VStateless_object {
1.1 parser 45: public: // Value
46:
1.25 paf 47: override const char* type() const { return VDATE_TYPE; }
48: override VStateless_class *get_class() { return date_class; }
1.10 paf 49:
1.1 parser 50: /// VDate: ftime -> float days
1.28 paf 51: override Value& as_expr_result(bool /*return_string_as_is=false*/) { return *new VDouble(as_double()); }
1.1 parser 52:
1.46 misha 53: /// VDate: true
54: override bool is_evaluated_expr() const { return true; }
55:
1.1 parser 56: /// VDate: ftime -> float days
1.25 paf 57: override double as_double() const { return ((double)ftime)/ SECS_PER_DAY; }
1.46 misha 58:
1.1 parser 59: /// VDate: 0 or !0
1.25 paf 60: override bool as_bool() const { return ftime!=0; }
1.1 parser 61:
1.41 paf 62: /// @TODO 'static' approach is NOT thread safe!
1.40 paf 63: tm& get_localtime()
1.35 paf 64: {
1.41 paf 65: char saved_tz[MAX_STRING];
1.48 misha 66: static char saved_tz_pair[MAX_STRING]; // @TODO: this is NOT thread safe!
1.35 paf 67: static char temp_tz_pair[MAX_STRING];
68: if(ftz_cstr) {
1.41 paf 69: if(const char* ltz=getenv("TZ")) {
70: strncpy(saved_tz, ltz, sizeof(saved_tz)-1);
71: saved_tz[sizeof(saved_tz)-1]=0;
72: } else
73: saved_tz[0]=0;
74:
1.35 paf 75: ::set_tz(ftz_cstr, temp_tz_pair, sizeof(temp_tz_pair));
76: }
77: tm *result=::localtime(&ftime);
1.38 paf 78: if(ftz_cstr) {
1.35 paf 79: ::set_tz(saved_tz, saved_tz_pair, sizeof(saved_tz_pair));
1.38 paf 80: }
1.35 paf 81: if(!result)
1.47 misha 82: throw Exception(DATE_RANGE_EXCEPTION_TYPE,
1.35 paf 83: 0,
84: "invalid datetime (after changing TZ)");
85:
1.40 paf 86: return *result;
1.35 paf 87: }
88:
1.50 ! misha 89: const String* get_sql_string(){
! 90: int size=1+ 4+1+2+1+2 +1+ 2+1+2+1+2 +1 +1;
! 91: char *buf=new(PointerFreeGC) char[size];
! 92: size=strftime(buf, size, "%Y-%m-%d %H:%M:%S", &get_localtime());
! 93: return new String(buf);
! 94: }
! 95:
! 96: const String* get_gmt_string(){
! 97: return new String(date_gmt_string(gmtime(&ftime)));
! 98: }
1.1 parser 99:
1.15 paf 100: /// VDate: method,field
1.49 misha 101: override Value* get_element(const String& aname) {
1.15 paf 102: // $method
1.49 misha 103: if(Value* result=VStateless_object::get_element(aname))
1.1 parser 104: return result;
105:
1.27 paf 106: // $TZ
107: if(aname=="TZ")
1.37 paf 108: return ftz? new VString(*ftz): new VString();
1.27 paf 109:
1.1 parser 110: // $year month day hour minute second weekday
1.40 paf 111: tm& tms=get_localtime();
1.27 paf 112:
1.1 parser 113: int result;
1.40 paf 114: if(aname=="year") result=1900+tms.tm_year;
115: else if(aname=="month") result=1+tms.tm_mon;
116: else if(aname=="day") result=tms.tm_mday;
117: else if(aname=="hour") result=tms.tm_hour;
118: else if(aname=="minute") result=tms.tm_min;
119: else if(aname=="second") result=tms.tm_sec;
120: else if(aname=="weekday") result=tms.tm_wday;
121: else if(aname=="yearday") result=tms.tm_yday;
122: else if(aname=="daylightsaving") result=tms.tm_isdst;
1.44 misha 123: else if(aname=="week") {
124: yw week = CalcWeek(tms);
125: result=week.week;
126: }
127: else if(aname=="weekyear") {
128: yw week = CalcWeek(tms);
129: result=1900+week.year;
130: } else { return bark("%s field not found", &aname); }
1.25 paf 131: return new VInt(result);
1.1 parser 132: }
133:
134: public: // usage
135:
1.27 paf 136: VDate(time_t adate) :
137: ftz(0),
138: ftz_cstr(0) {
1.33 paf 139: set_time(adate);
1.27 paf 140: }
1.1 parser 141:
1.32 paf 142: VDate(tm tmIn) :
143: ftime(0),
144: ftz(0),
145: ftz_cstr(0) {
146: set_time(tmIn);
147: }
148:
1.19 paf 149: time_t get_time() const { return ftime; }
1.32 paf 150: void set_time(time_t atime) {
151: if(atime<0)
1.47 misha 152: throw Exception(DATE_RANGE_EXCEPTION_TYPE,
1.32 paf 153: 0,
154: "invalid datetime");
155: ftime=atime;
156: }
157: void set_time(tm tmIn) {
158: time_t t=mktime(&tmIn);
159: if(t<0) {
160: // on some platforms mktime does not fix spring daylightsaving time hole
161: // in russia -- last sunday of march, 2am->3am hole
162: // trying to recover:
163: tmIn.tm_hour--;
164: t=mktime(&tmIn);
165: }
166: set_time(t);
167: }
1.27 paf 168: void set_tz(const String* atz) {
1.30 paf 169: if((ftz=atz))
1.27 paf 170: ftz_cstr=ftz->cstr();
1.40 paf 171: }
172:
1.44 misha 173: struct yw {
174: int year;
175: int week;
176: };
177:
178: static yw CalcWeek(tm& tms) {
179: yw week = {tms.tm_year, 0};
180:
1.40 paf 181: // http://www.merlyn.demon.co.uk/weekinfo.htm
1.44 misha 182: 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};
183: int diff = tms.tm_yday-(FirstThurs[(tms.tm_year+1900) % 28]-4);
184: if (diff < 0){
185: tms.tm_mday = diff;
1.45 misha 186: mktime(&tms); // normalize
1.44 misha 187: week = CalcWeek(tms);
188: } else {
189: week.week = 1 + diff/7;
190: if ( week.week > 52 && ISOWeekCount(week.year) < week.week ){
191: week.year++;
192: week.week = 1;
193: }
194: }
195: return week;
196: }
197:
198: static int ISOWeekCount (int year) {
199: static const unsigned int YearWeeks[] = {
200: 52,52,52,52,53, 52,52,52,52,52,
201: 53,52,52,52,52, 52,53,52,52,52,
202: 52,53,52,52,52, 52,52,53
203: };
204: return YearWeeks[(year+1900) % 28];
1.27 paf 205: }
1.1 parser 206:
207: private:
208: time_t ftime;
1.27 paf 209: const String* ftz;
210: const char* ftz_cstr;
1.1 parser 211:
212: };
213:
214: #endif
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