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//! module Calendar 
//!     
//!   This module implements calendar calculations, and base classes 
//!   for time units.  
//! 
//!   example program: 
//!   <pre> 
//!   void write_month(object m) 
//!   { 
//!      object w; 
//!      object today; 
//!    
//!      today=function_object(object_program(m))->Day(); 
//!    
//!      write(sprintf("    %|28s\n", 
//!                    Simulate.capitalize(m->name()+" ") 
//!                      +m->year()->name())); 
//!       
//!      w=m->day(1)->week(); 
//!    
//!      write("    "); 
//!      foreach (Array.map(w->days(),w->day)->week_day_name(),string n) 
//!         write(sprintf("%3s ",n[0..2])); 
//!      write("\n"); 
//!    
//!      do 
//!      { 
//!         array a; 
//!         object d; 
//!         a=Array.map(Array.map(w->days(),w->day), 
//!                     lambda(object d,object m)  
//!                     { if (d->month()!=m) return 0; else return d; },m); 
//!    
//!         write(sprintf("%3s ",w->name())); 
//!         foreach (a,d) 
//!            if (d) 
//!               if (d!=today) write(sprintf(" %2d ",d->month_day())); 
//!               else write(sprintf(">%2d<",d->month_day())); 
//!            else write("    "); 
//!    
//!         write("\n"); 
//!         w++; 
//!      } 
//!      while (w->day(0)->month()==m); 
//!   } 
//!    </pre> 
//!   call with, for example,  
//!   <tt>write_month(Calendar.Swedish.Month());</tt>. 
//! 
//! class time_unit 
//! 
//! method array(string) lesser() 
//!   Gives a list of methods to get lesser (shorter) time units. 
//!   ie, for a month, this gives back <tt>({"day"})</tt> 
//!   and the method <tt>day(mixed n)</tt> gives back that  
//!   day object. The method <tt>days()</tt> gives back a 
//!   list of possible argument values to the method <tt>day</tt>. 
//!   Concurrently, <tt>Array.map(o->days(),o->day)</tt> gives 
//!   a list of day objects in the object <tt>o</tt>. 
//! 
//!    
//!   Ie:<pre> 
//!   array(string) lesser()    - gives back a list of possible xxx's. 
//!   object xxxs()             - gives back a list of possible n's. 
//!   object xxx(mixed n)       - gives back xxx n 
//!   object xxx(object(Xxx) o) - gives back the corresponing xxx  
//!   </pre> 
//! 
//!   The list of n's (as returned from xxxs) are always in order. 
//! 
//!   There are two n's with special meaning, 0 and -1. 
//!   0 always gives the first xxx, equal to  
//!   my_obj->xxx(my_obj->xxxs()[0]), and -1 gives the last, 
//!   equal to my_obj->xxx(my_obj->xxxs()[-1]). 
//! 
//!   To get all xxxs in the object, do something like 
//!   <tt>Array.map(my_obj->xxxs(),my_obj->xxx)</tt>. 
//! 
//!   xxx(object) may return zero, if there was no correspondning xxx. 
//! 
//! method array(string) greater() 
//!   Gives a list of methods to get greater (longer) time units  
//!   from this object. For a month, this gives back <tt>({"year"})</tt>, 
//!   thus the method <tt>month->year()</tt> gives the year object. 
//! 
//! method object next() 
//! method object prev() 
//! method object `+(int n) 
//! method object `-(int n) 
//! method object `-(object x) 
//!   next and prev gives the logical next and previous object. 
//!   The <tt>+</tt> operator gives that logical relative object, 
//!   ie <tt>my_day+14</tt> gives 14 days ahead. 
//!     <tt>-</tt> works the same way, but can also take an object 
//!   of the same type and give the difference as an integer. 
 
#define error(X) throw(({(X),backtrace()})) 
 
class _TimeUnit 
{ 
   object this=this_object(); 
 
   array(string) greater() { return ({}); } 
   array(string) lesser() { return ({}); } 
 
   int `<(object x) { error("'< undefined\n"); } 
   int `>(object x) { error("'> undefined\n"); } 
   int `==(object x) { error("'== undefined\n"); } 
 
   object `+(int n) { error("`+ undefined\n"); } 
   object|int `-(int n) { error("`- undefined\n"); } 
 
   object next() { return this+1; } 
   object prev() { return this+(-1); } 
} 
 
 
 
 
//! 
//! function datetime(int|void unix_time) 
//!          Replacement for localtime. 
//! 
//! function datetime_name(int|void unix_time) 
//!          Replacement for ctime. 
//! 
//! function datetime_short_name(int|void unix_time) 
//!          Replacement for ctime. 
//! 
 
// 
// Maybe these auxiliary routines should be somewhere else? Maybe even 
// written in C? 
// 
// 
static private int ymd2jd(int y, int m, int d) 
{ 
  if(m<3) { 
    y--; 
    m+=12; 
  } 
  return 1720995+d+2- (y/100) + (y/400) + (36525*y)/100 + (306001*(m+1))/10000; 
} 
 
static private int y2jd(int y) 
{ 
  y--; 
  return 1721426 - (y/100) + (y/400) + (36525*y)/100; 
} 
 
static private int leapyear(int year) 
{ 
  if((year%400) == 0) 
    return 1; 
  if((year%100) == 0) 
    return 0; 
  if((year%4) == 0) 
    return 1; 
  return 0; 
} 
 
static private int week(int year, int month, int day) 
{ 
  int delta_day, first_time, yday, first_day, first_next_day; 
 
  first_time = y2jd(year); 
  yday = ymd2jd(year, month, day)-first_time; 
  first_day = first_time%7; 
  first_next_day = y2jd(year+1)%7; 
 
  if((yday > (364+leapyear(year)-first_next_day)) && 
     (first_next_day <= 3)) 
    return 1; 
   
  if(first_day <= 3) { 
    /* Week begins on Thursday or erlier, means week one here. */ 
    delta_day = first_day; 
  } else { 
    /* Week begins on Friday or later, means same week as last year. */ 
    if(yday + first_day <= 6) { 
      /* Return the last week previous year. */ 
      return week(year-1, 12, 28); 
    } 
    delta_day = first_day-7; 
  } 
   
  /* Calculate week. Begin with week 1. */ 
  return (yday + delta_day)/7 + 1; 
} 
 
// Sane replacement for localtime(). 
mapping(string:int) datetime(int|void unix_time) 
{ 
   mapping t = localtime(unix_time || time()); 
   return ([ "year":t->year+1900, 
             "month":t->mon+1, 
             "day":t->mday, 
             "hour":t->hour, 
             "minute":t->min, 
             "second":t->sec, 
             "week":week(t->year+1900, t->mon+1, t->mday), 
             // ISO weekdays begin with Monday as 1 --- Sunday as 7. 
             "weekday":((t->wday+6)%7)+1, 
             "yearday":t->yday, 
             "timezone":t->timezone, 
             // Dayligt-saving time. 
             "DST":t->isdst ]); 
} 
 
// Sane replacement for ctime(). 
string datetime_name(int|void unix_time) 
{ 
  array(string) day_names = ({ "Mon", "Tue", "Wed", "Thu", 
                               "Fri", "Sat", "Sun" }); 
  array(string) month_names = ({ "Jan", "Feb", "Mar", "Apr", 
                                 "May", "Jun", "Jul", "Aug", 
                                 "Sep", "Oct", "Nov", "Dec" }); 
   
  mapping t = datetime(unix_time); 
  return sprintf("%04d-%02d-%02d (%s) -W%02d-%d (%s) %02d:%02d:%02d", 
                 t->year, t->month, t->day, month_names[t->month-1], 
                 t->week, t->weekday, day_names[t->weekday-1], 
                 t->hour, t->minute, t->second); 
} 
 
// Sane replacement for ctime(). 
string datetime_short_name(int|void unix_time) 
{ 
  mapping t = datetime(unix_time); 
  return sprintf("%04d-%02d-%02d %02d:%02d:%02d", 
                 t->year, t->month, t->day, 
                 t->hour, t->minute, t->second); 
}