Annotation of parser3/src/types/pa_vdate.h, revision 1.48
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:
1.48 ! misha 11: static const char * const IDENT_VDATE_H="$Date: 2008-09-04 09:36:14 $";
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:
1.1 parser 89:
1.15 paf 90: /// VDate: method,field
1.25 paf 91: override Value* get_element(const String& aname, Value& aself, bool looking_up) {
1.15 paf 92: // $method
1.25 paf 93: if(Value* result=VStateless_object::get_element(aname, aself, looking_up))
1.1 parser 94: return result;
95:
1.27 paf 96: // $TZ
97: if(aname=="TZ")
1.37 paf 98: return ftz? new VString(*ftz): new VString();
1.27 paf 99:
1.1 parser 100: // $year month day hour minute second weekday
1.40 paf 101: tm& tms=get_localtime();
1.27 paf 102:
1.1 parser 103: int result;
1.40 paf 104: if(aname=="year") result=1900+tms.tm_year;
105: else if(aname=="month") result=1+tms.tm_mon;
106: else if(aname=="day") result=tms.tm_mday;
107: else if(aname=="hour") result=tms.tm_hour;
108: else if(aname=="minute") result=tms.tm_min;
109: else if(aname=="second") result=tms.tm_sec;
110: else if(aname=="weekday") result=tms.tm_wday;
111: else if(aname=="yearday") result=tms.tm_yday;
112: else if(aname=="daylightsaving") result=tms.tm_isdst;
1.44 misha 113: else if(aname=="week") {
114: yw week = CalcWeek(tms);
115: result=week.week;
116: }
117: else if(aname=="weekyear") {
118: yw week = CalcWeek(tms);
119: result=1900+week.year;
120: } else { return bark("%s field not found", &aname); }
1.25 paf 121: return new VInt(result);
1.1 parser 122: }
123:
124: public: // usage
125:
1.27 paf 126: VDate(time_t adate) :
127: ftz(0),
128: ftz_cstr(0) {
1.33 paf 129: set_time(adate);
1.27 paf 130: }
1.1 parser 131:
1.32 paf 132: VDate(tm tmIn) :
133: ftime(0),
134: ftz(0),
135: ftz_cstr(0) {
136: set_time(tmIn);
137: }
138:
1.19 paf 139: time_t get_time() const { return ftime; }
1.32 paf 140: void set_time(time_t atime) {
141: if(atime<0)
1.47 misha 142: throw Exception(DATE_RANGE_EXCEPTION_TYPE,
1.32 paf 143: 0,
144: "invalid datetime");
145: ftime=atime;
146: }
147: void set_time(tm tmIn) {
148: time_t t=mktime(&tmIn);
149: if(t<0) {
150: // on some platforms mktime does not fix spring daylightsaving time hole
151: // in russia -- last sunday of march, 2am->3am hole
152: // trying to recover:
153: tmIn.tm_hour--;
154: t=mktime(&tmIn);
155: }
156: set_time(t);
157: }
1.27 paf 158: void set_tz(const String* atz) {
1.30 paf 159: if((ftz=atz))
1.27 paf 160: ftz_cstr=ftz->cstr();
1.40 paf 161: }
162:
1.44 misha 163: struct yw {
164: int year;
165: int week;
166: };
167:
168: static yw CalcWeek(tm& tms) {
169: yw week = {tms.tm_year, 0};
170:
1.40 paf 171: // http://www.merlyn.demon.co.uk/weekinfo.htm
1.44 misha 172: 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};
173: int diff = tms.tm_yday-(FirstThurs[(tms.tm_year+1900) % 28]-4);
174: if (diff < 0){
175: tms.tm_mday = diff;
1.45 misha 176: mktime(&tms); // normalize
1.44 misha 177: week = CalcWeek(tms);
178: } else {
179: week.week = 1 + diff/7;
180: if ( week.week > 52 && ISOWeekCount(week.year) < week.week ){
181: week.year++;
182: week.week = 1;
183: }
184: }
185: return week;
186: }
187:
188: static int ISOWeekCount (int year) {
189: static const unsigned int YearWeeks[] = {
190: 52,52,52,52,53, 52,52,52,52,52,
191: 53,52,52,52,52, 52,53,52,52,52,
192: 52,53,52,52,52, 52,52,53
193: };
194: return YearWeeks[(year+1900) % 28];
1.27 paf 195: }
1.1 parser 196:
197: private:
198: time_t ftime;
1.27 paf 199: const String* ftz;
200: const char* ftz_cstr;
1.1 parser 201:
202: };
203:
204: #endif
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