Annotation of parser3/src/types/pa_vdate.h, revision 1.56
1.1 parser 1: /** @file
2: Parser: @b date parser class decl.
3:
1.53 moko 4: Copyright (c) 2001-2012 Art. Lebedev Studio (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:
1.56 ! moko 11: #define IDENT_PA_VDATE_H "$Id: pa_vdate.h,v 1.55 2012/05/28 19:47:52 moko Exp $"
1.1 parser 12:
13: #include "classes.h"
14: #include "pa_common.h"
15: #include "pa_vstateless_object.h"
1.56 ! moko 16: #include "pa_vdouble.h"
1.1 parser 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:
26: /// value of type 'date'. implemented with @c time_t
1.25 paf 27: class VDate: public VStateless_object {
1.1 parser 28: public: // Value
29:
1.25 paf 30: override const char* type() const { return VDATE_TYPE; }
31: override VStateless_class *get_class() { return date_class; }
1.10 paf 32:
1.51 misha 33: /// VDate: json-string
1.56 ! moko 34: override const String* get_json_string(Json_options& options);
1.51 misha 35:
1.1 parser 36: /// VDate: ftime -> float days
1.54 moko 37: override Value& as_expr_result() { return *new VDouble(as_double()); }
1.1 parser 38:
1.46 misha 39: /// VDate: true
40: override bool is_evaluated_expr() const { return true; }
41:
1.1 parser 42: /// VDate: ftime -> float days
1.25 paf 43: override double as_double() const { return ((double)ftime)/ SECS_PER_DAY; }
1.46 misha 44:
1.1 parser 45: /// VDate: 0 or !0
1.25 paf 46: override bool as_bool() const { return ftime!=0; }
1.1 parser 47:
1.56 ! moko 48: tm& get_localtime();
1.35 paf 49:
1.52 misha 50: enum sql_string_type {sql_string_datetime, sql_string_date, sql_string_time};
51:
1.56 ! moko 52: const String* get_sql_string(sql_string_type format = sql_string_datetime);
! 53: const String* get_gmt_string();
1.1 parser 54:
1.15 paf 55: /// VDate: method,field
1.56 ! moko 56: override Value* get_element(const String& aname);
1.1 parser 57:
58: public: // usage
59:
1.56 ! moko 60: VDate(time_t adate) :
1.27 paf 61: ftz(0),
62: ftz_cstr(0) {
1.33 paf 63: set_time(adate);
1.27 paf 64: }
1.1 parser 65:
1.56 ! moko 66: VDate(tm tmIn) :
1.32 paf 67: ftime(0),
68: ftz(0),
69: ftz_cstr(0) {
70: set_time(tmIn);
71: }
72:
1.19 paf 73: time_t get_time() const { return ftime; }
1.56 ! moko 74:
! 75: void set_time(time_t atime) {
! 76: if(atime==-1)
! 77: throw Exception(DATE_RANGE_EXCEPTION_TYPE, 0, "invalid datetime");
! 78: ftime=atime;
1.32 paf 79: }
1.56 ! moko 80:
! 81: void set_time(tm tmIn) {
1.32 paf 82: time_t t=mktime(&tmIn);
1.56 ! moko 83: if(t==-1) {
1.32 paf 84: // on some platforms mktime does not fix spring daylightsaving time hole
85: // in russia -- last sunday of march, 2am->3am hole
86: // trying to recover:
87: tmIn.tm_hour--;
88: t=mktime(&tmIn);
89: }
90: set_time(t);
91: }
1.56 ! moko 92:
1.27 paf 93: void set_tz(const String* atz) {
1.30 paf 94: if((ftz=atz))
1.27 paf 95: ftz_cstr=ftz->cstr();
1.40 paf 96: }
97:
1.44 misha 98: struct yw {
99: int year;
100: int week;
101: };
102:
103: static yw CalcWeek(tm& tms) {
104: yw week = {tms.tm_year, 0};
105:
1.40 paf 106: // http://www.merlyn.demon.co.uk/weekinfo.htm
1.44 misha 107: 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};
108: int diff = tms.tm_yday-(FirstThurs[(tms.tm_year+1900) % 28]-4);
109: if (diff < 0){
110: tms.tm_mday = diff;
1.45 misha 111: mktime(&tms); // normalize
1.44 misha 112: week = CalcWeek(tms);
113: } else {
114: week.week = 1 + diff/7;
115: if ( week.week > 52 && ISOWeekCount(week.year) < week.week ){
116: week.year++;
117: week.week = 1;
118: }
119: }
120: return week;
121: }
122:
123: static int ISOWeekCount (int year) {
124: static const unsigned int YearWeeks[] = {
125: 52,52,52,52,53, 52,52,52,52,52,
126: 53,52,52,52,52, 52,53,52,52,52,
127: 52,53,52,52,52, 52,52,53
128: };
129: return YearWeeks[(year+1900) % 28];
1.27 paf 130: }
1.1 parser 131:
132: private:
133: time_t ftime;
1.27 paf 134: const String* ftz;
135: const char* ftz_cstr;
1.1 parser 136:
137: };
138:
139: #endif
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