Annotation of parser3/src/types/pa_vdate.h, revision 1.43
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:
1.43 ! paf 11: static const char * const IDENT_VDATE_H="$Date: 2005/11/22 14:30:06 $";
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
! 34: putenv("TZ");
! 35: #endif
1.27 paf 36: tzset();
37: }
38:
1.1 parser 39: /// value of type 'date'. implemented with @c time_t
1.25 paf 40: class VDate: public VStateless_object {
1.1 parser 41: public: // Value
42:
1.25 paf 43: override const char* type() const { return VDATE_TYPE; }
44: override VStateless_class *get_class() { return date_class; }
1.10 paf 45:
1.1 parser 46: /// VDate: ftime -> float days
1.28 paf 47: override Value& as_expr_result(bool /*return_string_as_is=false*/) { return *new VDouble(as_double()); }
1.1 parser 48:
49: /// VDate: ftime -> float days
1.25 paf 50: override double as_double() const { return ((double)ftime)/ SECS_PER_DAY; }
1.1 parser 51: /// VDate: 0 or !0
1.25 paf 52: override bool as_bool() const { return ftime!=0; }
1.1 parser 53:
1.41 paf 54: /// @TODO 'static' approach is NOT thread safe!
1.40 paf 55: tm& get_localtime()
1.35 paf 56: {
1.41 paf 57: char saved_tz[MAX_STRING];
58: static char saved_tz_pair[MAX_STRING]; //TODO: this is NOT thread safe!
1.35 paf 59: static char temp_tz_pair[MAX_STRING];
60: if(ftz_cstr) {
1.41 paf 61: if(const char* ltz=getenv("TZ")) {
62: strncpy(saved_tz, ltz, sizeof(saved_tz)-1);
63: saved_tz[sizeof(saved_tz)-1]=0;
64: } else
65: saved_tz[0]=0;
66:
1.35 paf 67: ::set_tz(ftz_cstr, temp_tz_pair, sizeof(temp_tz_pair));
68: }
69: tm *result=::localtime(&ftime);
1.38 paf 70: if(ftz_cstr) {
1.35 paf 71: ::set_tz(saved_tz, saved_tz_pair, sizeof(saved_tz_pair));
1.38 paf 72: }
1.35 paf 73: if(!result)
74: throw Exception(0,
75: 0,
76: "invalid datetime (after changing TZ)");
77:
1.40 paf 78: return *result;
1.35 paf 79: }
80:
1.1 parser 81:
1.15 paf 82: /// VDate: method,field
1.25 paf 83: override Value* get_element(const String& aname, Value& aself, bool looking_up) {
1.15 paf 84: // $method
1.25 paf 85: if(Value* result=VStateless_object::get_element(aname, aself, looking_up))
1.1 parser 86: return result;
87:
1.27 paf 88: // $TZ
89: if(aname=="TZ")
1.37 paf 90: return ftz? new VString(*ftz): new VString();
1.27 paf 91:
1.1 parser 92: // $year month day hour minute second weekday
1.40 paf 93: tm& tms=get_localtime();
1.27 paf 94:
1.1 parser 95: int result;
1.40 paf 96: if(aname=="year") result=1900+tms.tm_year;
97: else if(aname=="month") result=1+tms.tm_mon;
98: else if(aname=="day") result=tms.tm_mday;
99: else if(aname=="hour") result=tms.tm_hour;
100: else if(aname=="minute") result=tms.tm_min;
101: else if(aname=="second") result=tms.tm_sec;
102: else if(aname=="weekday") result=tms.tm_wday;
103: else if(aname=="yearday") result=tms.tm_yday;
104: else if(aname=="daylightsaving") result=tms.tm_isdst;
105: else if(aname=="week") result=week_no(tms);
1.26 paf 106: else { return bark("%s field not found", &aname); }
1.25 paf 107: return new VInt(result);
1.1 parser 108: }
109:
110: public: // usage
111:
1.27 paf 112: VDate(time_t adate) :
113: ftz(0),
114: ftz_cstr(0) {
1.33 paf 115: set_time(adate);
1.27 paf 116: }
1.1 parser 117:
1.32 paf 118: VDate(tm tmIn) :
119: ftime(0),
120: ftz(0),
121: ftz_cstr(0) {
122: set_time(tmIn);
123: }
124:
1.19 paf 125: time_t get_time() const { return ftime; }
1.32 paf 126: void set_time(time_t atime) {
127: if(atime<0)
128: throw Exception(0,
129: 0,
130: "invalid datetime");
131: ftime=atime;
132: }
133: void set_time(tm tmIn) {
134: time_t t=mktime(&tmIn);
135: if(t<0) {
136: // on some platforms mktime does not fix spring daylightsaving time hole
137: // in russia -- last sunday of march, 2am->3am hole
138: // trying to recover:
139: tmIn.tm_hour--;
140: t=mktime(&tmIn);
141: }
142: set_time(t);
143: }
1.27 paf 144: void set_tz(const String* atz) {
1.30 paf 145: if((ftz=atz))
1.27 paf 146: ftz_cstr=ftz->cstr();
1.40 paf 147: }
148:
149: static int week_no(tm& tms) {
150: // http://www.merlyn.demon.co.uk/weekinfo.htm
151: int weekyear=tms.tm_year+1900;
152: 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};
153: return 1 + (tms.tm_yday-(FirstThurs[weekyear % 28]-3))/7;
1.27 paf 154: }
1.1 parser 155:
156: private:
157:
158: time_t ftime;
1.27 paf 159: const String* ftz;
160: const char* ftz_cstr;
1.1 parser 161:
162: };
163:
164: #endif
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