Annotation of parser3/src/types/pa_vdate.h, revision 1.38.6.2
1.1 parser 1: /** @file
2: Parser: @b date parser class decl.
3:
1.38.6.1 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:
1.38.6.2! paf 11: static const char * const IDENT_VDATE_H="$Date: 2005/08/05 13:03:04 $";
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) {
1.38 paf 27: if(tz){
28: snprintf(buf, buf_size, "TZ=%s", tz);
29: putenv(buf);
30: } else
31: putenv("TZ");
1.27 paf 32: tzset();
33: }
34:
1.1 parser 35: /// value of type 'date'. implemented with @c time_t
1.25 paf 36: class VDate: public VStateless_object {
1.1 parser 37: public: // Value
38:
1.25 paf 39: override const char* type() const { return VDATE_TYPE; }
40: override VStateless_class *get_class() { return date_class; }
1.10 paf 41:
1.1 parser 42: /// VDate: ftime -> float days
1.28 paf 43: override Value& as_expr_result(bool /*return_string_as_is=false*/) { return *new VDouble(as_double()); }
1.1 parser 44:
45: /// VDate: ftime -> float days
1.25 paf 46: override double as_double() const { return ((double)ftime)/ SECS_PER_DAY; }
1.1 parser 47: /// VDate: 0 or !0
1.25 paf 48: override bool as_bool() const { return ftime!=0; }
1.1 parser 49:
1.38.6.2! paf 50: tm& get_localtime()
1.35 paf 51: {
52: const char* saved_tz=0;
53: static char saved_tz_pair[MAX_STRING];
54: static char temp_tz_pair[MAX_STRING];
55: if(ftz_cstr) {
56: saved_tz=getenv("TZ");
57: ::set_tz(ftz_cstr, temp_tz_pair, sizeof(temp_tz_pair));
58: }
59: tm *result=::localtime(&ftime);
1.38 paf 60: if(ftz_cstr) {
1.35 paf 61: ::set_tz(saved_tz, saved_tz_pair, sizeof(saved_tz_pair));
1.38 paf 62: }
1.35 paf 63: if(!result)
64: throw Exception(0,
65: 0,
66: "invalid datetime (after changing TZ)");
67:
1.38.6.2! paf 68: return *result;
1.35 paf 69: }
70:
1.1 parser 71:
1.15 paf 72: /// VDate: method,field
1.25 paf 73: override Value* get_element(const String& aname, Value& aself, bool looking_up) {
1.15 paf 74: // $method
1.25 paf 75: if(Value* result=VStateless_object::get_element(aname, aself, looking_up))
1.1 parser 76: return result;
77:
1.27 paf 78: // $TZ
79: if(aname=="TZ")
1.37 paf 80: return ftz? new VString(*ftz): new VString();
1.27 paf 81:
1.1 parser 82: // $year month day hour minute second weekday
1.38.6.2! paf 83: tm& tms=get_localtime();
1.27 paf 84:
1.1 parser 85: int result;
1.38.6.2! paf 86: if(aname=="year") result=1900+tms.tm_year;
! 87: else if(aname=="month") result=1+tms.tm_mon;
! 88: else if(aname=="day") result=tms.tm_mday;
! 89: else if(aname=="hour") result=tms.tm_hour;
! 90: else if(aname=="minute") result=tms.tm_min;
! 91: else if(aname=="second") result=tms.tm_sec;
! 92: else if(aname=="weekday") result=tms.tm_wday;
! 93: else if(aname=="yearday") result=tms.tm_yday;
! 94: else if(aname=="daylightsaving") result=tms.tm_isdst;
! 95: else if(aname=="week") result=week_no(tms);
1.26 paf 96: else { return bark("%s field not found", &aname); }
1.25 paf 97: return new VInt(result);
1.1 parser 98: }
99:
100: public: // usage
101:
1.27 paf 102: VDate(time_t adate) :
103: ftz(0),
104: ftz_cstr(0) {
1.33 paf 105: set_time(adate);
1.27 paf 106: }
1.1 parser 107:
1.32 paf 108: VDate(tm tmIn) :
109: ftime(0),
110: ftz(0),
111: ftz_cstr(0) {
112: set_time(tmIn);
113: }
114:
1.19 paf 115: time_t get_time() const { return ftime; }
1.32 paf 116: void set_time(time_t atime) {
117: if(atime<0)
118: throw Exception(0,
119: 0,
120: "invalid datetime");
121: ftime=atime;
122: }
123: void set_time(tm tmIn) {
124: time_t t=mktime(&tmIn);
125: if(t<0) {
126: // on some platforms mktime does not fix spring daylightsaving time hole
127: // in russia -- last sunday of march, 2am->3am hole
128: // trying to recover:
129: tmIn.tm_hour--;
130: t=mktime(&tmIn);
131: }
132: set_time(t);
133: }
1.27 paf 134: void set_tz(const String* atz) {
1.30 paf 135: if((ftz=atz))
1.27 paf 136: ftz_cstr=ftz->cstr();
1.38.6.2! paf 137: }
! 138:
! 139: static int week_no(tm& tms) {
! 140: // http://www.merlyn.demon.co.uk/weekinfo.htm
! 141: int weekyear=tms.tm_year+1900;
! 142: const 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};
! 143: return 1 + (tms.tm_yday-(FirstThurs[weekyear % 28]-3))/7;
1.27 paf 144: }
1.1 parser 145:
146: private:
147:
148: time_t ftime;
1.27 paf 149: const String* ftz;
150: const char* ftz_cstr;
1.1 parser 151:
152: };
153:
154: #endif
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