Annotation of parser3/src/types/pa_vdate.h, revision 1.42
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:
1.42 ! paf 11: static const char * const IDENT_VDATE_H="$Date: 2005/11/22 14:27:32 $";
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) {
1.42 ! paf 27: snprintf(buf, buf_size, "TZ=%s", tz);
! 28: putenv(buf);
1.27 paf 29: tzset();
30: }
31:
1.1 parser 32: /// value of type 'date'. implemented with @c time_t
1.25 paf 33: class VDate: public VStateless_object {
1.1 parser 34: public: // Value
35:
1.25 paf 36: override const char* type() const { return VDATE_TYPE; }
37: override VStateless_class *get_class() { return date_class; }
1.10 paf 38:
1.1 parser 39: /// VDate: ftime -> float days
1.28 paf 40: override Value& as_expr_result(bool /*return_string_as_is=false*/) { return *new VDouble(as_double()); }
1.1 parser 41:
42: /// VDate: ftime -> float days
1.25 paf 43: override double as_double() const { return ((double)ftime)/ SECS_PER_DAY; }
1.1 parser 44: /// VDate: 0 or !0
1.25 paf 45: override bool as_bool() const { return ftime!=0; }
1.1 parser 46:
1.41 paf 47: /// @TODO 'static' approach is NOT thread safe!
1.40 paf 48: tm& get_localtime()
1.35 paf 49: {
1.41 paf 50: char saved_tz[MAX_STRING];
51: static char saved_tz_pair[MAX_STRING]; //TODO: this is NOT thread safe!
1.35 paf 52: static char temp_tz_pair[MAX_STRING];
53: if(ftz_cstr) {
1.41 paf 54: if(const char* ltz=getenv("TZ")) {
55: strncpy(saved_tz, ltz, sizeof(saved_tz)-1);
56: saved_tz[sizeof(saved_tz)-1]=0;
57: } else
58: saved_tz[0]=0;
59:
1.35 paf 60: ::set_tz(ftz_cstr, temp_tz_pair, sizeof(temp_tz_pair));
61: }
62: tm *result=::localtime(&ftime);
1.38 paf 63: if(ftz_cstr) {
1.35 paf 64: ::set_tz(saved_tz, saved_tz_pair, sizeof(saved_tz_pair));
1.38 paf 65: }
1.35 paf 66: if(!result)
67: throw Exception(0,
68: 0,
69: "invalid datetime (after changing TZ)");
70:
1.40 paf 71: return *result;
1.35 paf 72: }
73:
1.1 parser 74:
1.15 paf 75: /// VDate: method,field
1.25 paf 76: override Value* get_element(const String& aname, Value& aself, bool looking_up) {
1.15 paf 77: // $method
1.25 paf 78: if(Value* result=VStateless_object::get_element(aname, aself, looking_up))
1.1 parser 79: return result;
80:
1.27 paf 81: // $TZ
82: if(aname=="TZ")
1.37 paf 83: return ftz? new VString(*ftz): new VString();
1.27 paf 84:
1.1 parser 85: // $year month day hour minute second weekday
1.40 paf 86: tm& tms=get_localtime();
1.27 paf 87:
1.1 parser 88: int result;
1.40 paf 89: if(aname=="year") result=1900+tms.tm_year;
90: else if(aname=="month") result=1+tms.tm_mon;
91: else if(aname=="day") result=tms.tm_mday;
92: else if(aname=="hour") result=tms.tm_hour;
93: else if(aname=="minute") result=tms.tm_min;
94: else if(aname=="second") result=tms.tm_sec;
95: else if(aname=="weekday") result=tms.tm_wday;
96: else if(aname=="yearday") result=tms.tm_yday;
97: else if(aname=="daylightsaving") result=tms.tm_isdst;
98: else if(aname=="week") result=week_no(tms);
1.26 paf 99: else { return bark("%s field not found", &aname); }
1.25 paf 100: return new VInt(result);
1.1 parser 101: }
102:
103: public: // usage
104:
1.27 paf 105: VDate(time_t adate) :
106: ftz(0),
107: ftz_cstr(0) {
1.33 paf 108: set_time(adate);
1.27 paf 109: }
1.1 parser 110:
1.32 paf 111: VDate(tm tmIn) :
112: ftime(0),
113: ftz(0),
114: ftz_cstr(0) {
115: set_time(tmIn);
116: }
117:
1.19 paf 118: time_t get_time() const { return ftime; }
1.32 paf 119: void set_time(time_t atime) {
120: if(atime<0)
121: throw Exception(0,
122: 0,
123: "invalid datetime");
124: ftime=atime;
125: }
126: void set_time(tm tmIn) {
127: time_t t=mktime(&tmIn);
128: if(t<0) {
129: // on some platforms mktime does not fix spring daylightsaving time hole
130: // in russia -- last sunday of march, 2am->3am hole
131: // trying to recover:
132: tmIn.tm_hour--;
133: t=mktime(&tmIn);
134: }
135: set_time(t);
136: }
1.27 paf 137: void set_tz(const String* atz) {
1.30 paf 138: if((ftz=atz))
1.27 paf 139: ftz_cstr=ftz->cstr();
1.40 paf 140: }
141:
142: static int week_no(tm& tms) {
143: // http://www.merlyn.demon.co.uk/weekinfo.htm
144: int weekyear=tms.tm_year+1900;
145: 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};
146: return 1 + (tms.tm_yday-(FirstThurs[weekyear % 28]-3))/7;
1.27 paf 147: }
1.1 parser 148:
149: private:
150:
151: time_t ftime;
1.27 paf 152: const String* ftz;
153: const char* ftz_cstr;
1.1 parser 154:
155: };
156:
157: #endif
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