Annotation of parser3/src/types/pa_vdate.h, revision 1.45
1.1 parser 1: /** @file
2: Parser: @b date parser class decl.
3:
1.39 paf 4: Copyright (c) 2001-2005 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:
1.45 ! misha 11: static const char * const IDENT_VDATE_H="$Date: 2007/03/22 13:38:40 $";
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:
53: /// VDate: ftime -> float days
1.25 paf 54: override double as_double() const { return ((double)ftime)/ SECS_PER_DAY; }
1.1 parser 55: /// VDate: 0 or !0
1.25 paf 56: override bool as_bool() const { return ftime!=0; }
1.1 parser 57:
1.41 paf 58: /// @TODO 'static' approach is NOT thread safe!
1.40 paf 59: tm& get_localtime()
1.35 paf 60: {
1.41 paf 61: char saved_tz[MAX_STRING];
62: static char saved_tz_pair[MAX_STRING]; //TODO: this is NOT thread safe!
1.35 paf 63: static char temp_tz_pair[MAX_STRING];
64: if(ftz_cstr) {
1.41 paf 65: if(const char* ltz=getenv("TZ")) {
66: strncpy(saved_tz, ltz, sizeof(saved_tz)-1);
67: saved_tz[sizeof(saved_tz)-1]=0;
68: } else
69: saved_tz[0]=0;
70:
1.35 paf 71: ::set_tz(ftz_cstr, temp_tz_pair, sizeof(temp_tz_pair));
72: }
73: tm *result=::localtime(&ftime);
1.38 paf 74: if(ftz_cstr) {
1.35 paf 75: ::set_tz(saved_tz, saved_tz_pair, sizeof(saved_tz_pair));
1.38 paf 76: }
1.35 paf 77: if(!result)
78: throw Exception(0,
79: 0,
80: "invalid datetime (after changing TZ)");
81:
1.40 paf 82: return *result;
1.35 paf 83: }
84:
1.1 parser 85:
1.15 paf 86: /// VDate: method,field
1.25 paf 87: override Value* get_element(const String& aname, Value& aself, bool looking_up) {
1.15 paf 88: // $method
1.25 paf 89: if(Value* result=VStateless_object::get_element(aname, aself, looking_up))
1.1 parser 90: return result;
91:
1.27 paf 92: // $TZ
93: if(aname=="TZ")
1.37 paf 94: return ftz? new VString(*ftz): new VString();
1.27 paf 95:
1.1 parser 96: // $year month day hour minute second weekday
1.40 paf 97: tm& tms=get_localtime();
1.27 paf 98:
1.1 parser 99: int result;
1.40 paf 100: if(aname=="year") result=1900+tms.tm_year;
101: else if(aname=="month") result=1+tms.tm_mon;
102: else if(aname=="day") result=tms.tm_mday;
103: else if(aname=="hour") result=tms.tm_hour;
104: else if(aname=="minute") result=tms.tm_min;
105: else if(aname=="second") result=tms.tm_sec;
106: else if(aname=="weekday") result=tms.tm_wday;
107: else if(aname=="yearday") result=tms.tm_yday;
108: else if(aname=="daylightsaving") result=tms.tm_isdst;
1.44 misha 109: else if(aname=="week") {
110: yw week = CalcWeek(tms);
111: result=week.week;
112: }
113: else if(aname=="weekyear") {
114: yw week = CalcWeek(tms);
115: result=1900+week.year;
116: } else { return bark("%s field not found", &aname); }
1.25 paf 117: return new VInt(result);
1.1 parser 118: }
119:
120: public: // usage
121:
1.27 paf 122: VDate(time_t adate) :
123: ftz(0),
124: ftz_cstr(0) {
1.33 paf 125: set_time(adate);
1.27 paf 126: }
1.1 parser 127:
1.32 paf 128: VDate(tm tmIn) :
129: ftime(0),
130: ftz(0),
131: ftz_cstr(0) {
132: set_time(tmIn);
133: }
134:
1.19 paf 135: time_t get_time() const { return ftime; }
1.32 paf 136: void set_time(time_t atime) {
137: if(atime<0)
138: throw Exception(0,
139: 0,
140: "invalid datetime");
141: ftime=atime;
142: }
143: void set_time(tm tmIn) {
144: time_t t=mktime(&tmIn);
145: if(t<0) {
146: // on some platforms mktime does not fix spring daylightsaving time hole
147: // in russia -- last sunday of march, 2am->3am hole
148: // trying to recover:
149: tmIn.tm_hour--;
150: t=mktime(&tmIn);
151: }
152: set_time(t);
153: }
1.27 paf 154: void set_tz(const String* atz) {
1.30 paf 155: if((ftz=atz))
1.27 paf 156: ftz_cstr=ftz->cstr();
1.40 paf 157: }
158:
1.44 misha 159: struct yw {
160: int year;
161: int week;
162: };
163:
164: static yw CalcWeek(tm& tms) {
165: yw week = {tms.tm_year, 0};
166:
1.40 paf 167: // http://www.merlyn.demon.co.uk/weekinfo.htm
1.44 misha 168: 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};
169: int diff = tms.tm_yday-(FirstThurs[(tms.tm_year+1900) % 28]-4);
170: if (diff < 0){
171: tms.tm_mday = diff;
1.45 ! misha 172: mktime(&tms); // normalize
1.44 misha 173: week = CalcWeek(tms);
174: } else {
175: week.week = 1 + diff/7;
176: if ( week.week > 52 && ISOWeekCount(week.year) < week.week ){
177: week.year++;
178: week.week = 1;
179: }
180: }
181: return week;
182: }
183:
184: static int ISOWeekCount (int year) {
185: static const unsigned int YearWeeks[] = {
186: 52,52,52,52,53, 52,52,52,52,52,
187: 53,52,52,52,52, 52,53,52,52,52,
188: 52,53,52,52,52, 52,52,53
189: };
190: return YearWeeks[(year+1900) % 28];
1.27 paf 191: }
1.1 parser 192:
193: private:
194: time_t ftime;
1.27 paf 195: const String* ftz;
196: const char* ftz_cstr;
1.1 parser 197:
198: };
199:
200: #endif
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