dc21d42001-05-05Mirar (Pontus Hagland) //! module Calendar // $Id: TimeRanges.pmod,v 1.17 2001/05/05 15:18:49 mirar Exp $
bd46602000-10-10Mirar (Pontus Hagland) 
a580e12000-09-27Fredrik Hübinette (Hubbe) #pike __REAL_VERSION__
a20af62000-09-26Fredrik Hübinette (Hubbe) 
78fd532000-07-12Mirar (Pontus Hagland) #define zero int(0..0) import "."; program SuperTimeRange=cSuperTimeRange; string calendar_name() { return "TimeRanges"; } object calendar_object=this_object(); string _sprintf(int t) { return (t=='O')?calendar_name():0; }
c0dbee2000-08-01Mirar (Pontus Hagland) Ruleset default_rules= master()->resolv("Calendar")["default_rules"];
78fd532000-07-12Mirar (Pontus Hagland) 
dc21d42001-05-05Mirar (Pontus Hagland) //------------------------------------------------------------------------ //! class TimeRange
78fd532000-07-12Mirar (Pontus Hagland) //! This is the base class for any time measurement //! and calendrar information. It defines all the //! things you can do with a time range, any time //! period. //! //! A TimeRange doubles as both a fixed period in //! time, and an amount of time. For instance, //! a week plus a day moves the week-period one day //! ahead (unaligning it with the week period, //! and thereby reducing it to just 7 days), //! no matter when in time the actual day were. //!
dc21d42001-05-05Mirar (Pontus Hagland) //------------------------------------------------------------------------
78fd532000-07-12Mirar (Pontus Hagland) class TimeRange { constant is_timerange=1; Ruleset rules;
dc21d42001-05-05Mirar (Pontus Hagland) //! method void create("unix",int unixtime) //! method void create("unix",int unixtime,int seconds_len) //! Create the timerange from unix time (as given by //! <tt>time(2)</tt>), with eventually the size of //! the time range in the same unit, seconds. //! //! method void create("julian",int|float julian_day) //! Create the timerange from a julian day, the //! standardized method of counting days. If //! the timerange is more then a day, it will //! at least enclose the day. //! //! method void create(TimeRange from) //! Create the timerange from another timerange. //! //! This is useful when converting objects from //! one calendar to another. Note that the ruleset will be //! transferred to the new object, so this method //! can't be used to convert between timezones //! or languges - use <ref>set_timezone</ref>, //! <ref>set_language</ref> or <ref>set_ruleset</ref> //! to achieve this. //! //! note: //! The size of the new object may be inexact; //! a Month object can't comprehend seconds, for instance.
78fd532000-07-12Mirar (Pontus Hagland)  static void create_unixtime(int unixtime,int len); static void create_unixtime_default(int unixtime); static void create_julian_day(int jd); void create(mixed ...args) { if (sizeof(args)) switch (args[0]) { case "unix": if (sizeof(args)==2) create_unixtime_default(args[1]); else if (sizeof(args)>2) create_unixtime(@args[1..]); else break; return; case "unix_r": if (sizeof(args)==3) { rules=args[2]; create_unixtime_default(args[1]); } else if (sizeof(args)>2) { rules=args[3]; create_unixtime(args[1],args[2]); } else break; return; case "julian": if (sizeof(args)==2) { create_julian_day(args[1]); return; } break; case "julian_r": if (sizeof(args)==3) { rules=args[2]; create_julian_day(args[1]); return; } break; default: if (objectp(args[0]) && args[0]->is_timerange) { convert_from([object(TimeRange)]args[0]); return; } break; } error("%O.%O: Illegal parameters %O,%O,%O...\n", function_object(object_program(this_object())), object_program(this_object()), @args,0,0,0); } static void convert_from(TimeRange other) { // inheriting class must take care of size if (other->julian_day) { int|float jd=other->julian_day(); if (floatp(jd) && other->unix_time) create("unix_r",other->unix_time(),other->ruleset()); else create("julian_r",jd,other->ruleset()); } else if (other->unix_time) create("unix_r",other->unix_time(),other->ruleset()); else error("Can't convert %O->%s.%O\n",other, calendar_name(), object_program(this_object())); }
dc21d42001-05-05Mirar (Pontus Hagland) //! method TimeRange set_size(TimeRange size) //! method TimeRange set_size(int n,TimeRange size) //! Gives back a new (or the same, if the size matches) //! timerange with the new size. //! If <i>n</i> are given, the resulting size //! will be <i>n</i> amounts of the given size. //! note: //! A negative size is not permitted; a zero one are.
78fd532000-07-12Mirar (Pontus Hagland)  // virtual static TimeRange _set_size(int n,TimeRange x); TimeRange set_size(function|TimeRange|int(0..0x7fffffff) a, void|function|TimeRange b) { function|object(TimeRange) x; int(0..0x7fffffff) n; if (!b) if (intp(a)) x=[function|object(TimeRange)]this_object(), n=[int(0..0x7fffffff)]a; else x=a,n=1; else x=b,n=a; if (functionp(x)) x=promote_program(x); if (n<0) error("Negative size (%d)\n",n); return _set_size(n,[object(TimeRange)]x); }
dc21d42001-05-05Mirar (Pontus Hagland) //! method TimeRange add(int n,void|TimeRange step) //! calculates the (promoted) time period n steps away; //! if no step is given, the step's length is of the //! same length as the called time period. //! //! It is not recommended to loop by adding the increment //! time period to a shorter period; this can cause faults, //! if the shorter time period doesn't exist in the incremented //! period. (Like week 53, day 31 of a month or the leap day of a year.) //! //! Recommended use are like this: //! <pre> //! // loop over the 5th of the next 10 months //! TimeRange month=Month()+1; //! TimeRange orig_day=month()->day(5); //! for (int i=0; i&lt;10; i++) //! { //! month++; //! TimeRange day=month->place(orig_day); //! <i>...use day...</i> //! } //! </pre>
78fd532000-07-12Mirar (Pontus Hagland)  // virtual static this_program _add(int n,this_program step); this_program add(function|this_program|int a, void|function|this_program b) { function|object(this_program) x; int n; if (!b) if (intp(a)) x=[function|object(this_program)]this_object(), n=[int]a; else x=a,n=1; else x=b,n=a; if (functionp(x)) x=promote_program(x); return _add(n,[object(this_program)]x); }
dc21d42001-05-05Mirar (Pontus Hagland) //! method TimeRange place(TimeRange this) //! method TimeRange place(TimeRange this,int(0..1) force) //! This will place the given timerange in this timerange, //! for instance, day 37 in the year - //! <tt>Year(1934)->place(Day(1948 d37)) => Day(1934 d37)</tt>. //! //! note: //! The rules how to place things in different timeranges //! can be somewhat 'dwim'.
78fd532000-07-12Mirar (Pontus Hagland)  // virtual TimeRange place(TimeRange what,void|int force);
dc21d42001-05-05Mirar (Pontus Hagland) //! method TimeRange `+(int n) //! method TimeRange `+(TimeRange offset) //! method TimeRange `-(int m) //! method TimeRange `-(TimeRange x) //! This calculates the (promoted) time period //! either n step away or with a given offset. //! These functions does use <ref>add</ref> to really //! do the job: //! <pre> //! t+n t->add(n) t is a time period //! t-n t->add(-n) offset is a time period //! t+offset t->add(1,offset) n is an integer //! t-offset t->add(-1,offset) //! n+t t->add(n) //! n-t illegal //! offset+t offset->add(1,t) | note this! //! offset-t offset->add(-1,t) | //! </pre> //! //! Mathematic rules: //! <pre> //! x+(t-x) == t x is an integer or a time period //! (x+t)-x == t t is a time period //! (t+x)-x == t //! o-(o-t) == t o is a time period //! t++ == t+1 //! t-- == t-1 //! </pre> //! //! note: //! a-b does not give the distance between the start of a and b. //! Use the <ref>distance</ref>() function to calculate that. //! //! The integer used to `+, `- and add are the <i>number</i> //! of steps the motion will be. It does <i>never</i> represent //! any <i>fixed</i> amount of time, like seconds or days.
78fd532000-07-12Mirar (Pontus Hagland)  TimeRange `+(program|this_program|int n) { if (objectp(n)) return add(1,n); return add(n); } TimeRange ``+(int n) { return add(n); } TimeRange `-(TimeRange|program|int n) { if (objectp(n)) return add(-1,n); return add(-n); }
dc21d42001-05-05Mirar (Pontus Hagland) //! method TimeRange next() //! method TimeRange prev() //! Next and prev are compatible and convinience functions; //! <tt>a->next()</tt> is exactly the same as <tt>a+1</tt>; //! <tt>a=a->next()</tt> is <tt>a++</tt>.
072c5e2000-08-04Mirar (Pontus Hagland)  TimeRange next() { return this_object()+1; } TimeRange prev() { return this_object()-1; }
dc21d42001-05-05Mirar (Pontus Hagland) //! method TimeRange `*(int n) //! This changes the amount of time in //! the time period. <tt>t*17</tt> is //! the same as doing <tt>t-><ref>set_size</ref>(t,17)</tt>.
78fd532000-07-12Mirar (Pontus Hagland)  function ``* = `*; TimeRange `*(int n) { return set_size(n,this_object()); }
dc21d42001-05-05Mirar (Pontus Hagland) //! method array(TimeRange) `/(int n) //! method array(TimeRange) split(int n) //! This divides the called timerange into //! n pieces. The returned timerange type //! is not neccesarily of the same type as the called one. //! //! known bugs: //! These are currently not defined for //! <ref to=SuperTimeRange>supertimeranges</ref>. //! method int `/(TimeRange with) //! method int how_many(TimeRange with) //! This calculates how many instances of the given //! timerange has passed during the called timerange. //! //! For instance, to figure out your age, //! create the timerange of your lifespan, and divide //! with the instance of a <ref to=YMD.Year>Year</ref>.
78fd532000-07-12Mirar (Pontus Hagland)  // virtual array(TimeRange) split(int n); int how_many(function|TimeRange with) { if (functionp(with)) with=promote_program(with); // default method; not optimized - guessing TimeRange start=beginning(); TimeRange end=end(); // find low and high 2^n int nn=16; int low,high; TimeRange t=start+with*nn; if (t==end) return nn; // gotcha (luck) if (t>end) // scan less { for (;;) { nn>>=1; t=start+with*nn; if (t==end) return nn; // gotcha (luck) if (t<end) // ok, we're limited { low=nn; high=nn*2-1; break; } if (nn==1) return 0; // can't be less } } else { // sanity check TimeRange q=start+with*(nn+1); if (q==t) error("Result is infinite - argument is zero range\n"); for (;;) { nn<<=1; t=start+with*nn; if (t==end) return nn; // gotcha (luck) if (t>end) // ok, we're limited { low=(nn>>1); high=nn-1; break; } // loop forever - pike can handle *big* numbers } } for (;;) { nn=(low+high)/2; t=start+with*nn; if (t==end) return nn; if (t<end) low=nn+1; else high=nn-1; if (low>high) return high; // can't go further } } array(TimeRange)|int `/(TimeRange|program|int x) { if (intp(x)) return split(x); else return how_many(x); }
dc21d42001-05-05Mirar (Pontus Hagland) //! method int offset_to(TimeRange x) //! Calculates offset to x; this compares //! two timeranges and gives the integer offset //! between the two starting points. //! //! This is true for suitable a and b: //! <tt>a+a->offset_to(b)==b</tt> //! //! By suitable means that a and b are of the same //! type and size. This is obviously true only //! if a+n has b as a possible result for any n.
602d952000-08-14Mirar (Pontus Hagland)  int offset_to(TimeRange x) { if (x==this_object()) return 0; if (x<this_object()) return -(x->distance(this_object())/this_object()); return this_object()->distance(x)/this_object(); }
dc21d42001-05-05Mirar (Pontus Hagland) //! method TimeRange beginning() //! method TimeRange end() //! This gives back the zero-sized beginning //! or end of the called time period. //! //! rule: //! <tt>range(t->beginning(),t->end())==t</tt>
78fd532000-07-12Mirar (Pontus Hagland)  TimeRange beginning(); TimeRange end();
dc21d42001-05-05Mirar (Pontus Hagland) //! method TimeRange range(TimeRange other) //! method TimeRange space(TimeRange other) //! method TimeRange distance(TimeRange other) //! Derives different time periods in between //! the called timerange and the parameter timerange. //! //! <pre> //! &gt;- the past the future -&lt; //! |--called--| |--other--| //! &gt;------------ range -----------&lt; //! &gt;--space--&lt; //! &gt;----- distance -----&lt; //! </pre> //! //! See also: add, TimeRanges.range, TimeRanges.space, TimeRanges.distance
78fd532000-07-12Mirar (Pontus Hagland)  // virtual TimeRange distance(TimeRange to); TimeRange range(TimeRange with) { return distance(with->end()); } TimeRange space(TimeRange to) { return end()->distance(to->beginning()); }
dc21d42001-05-05Mirar (Pontus Hagland) //! method int(0..1) strictly_preceeds(TimeRange what); //! method int(0..1) preceeds(TimeRange what); //! method int(0..1) is_previous_to(TimeRange what); //! method int(0..1) overlaps(TimeRange what); //! method int(0..1) contains(TimeRange what); //! method int(0..1) equals(TimeRange what); //! method int(0..1) is_next_to(TimeRange what); //! method int(0..1) succeeds(TimeRange what); //! method int(0..1) strictly_succeeds(TimeRange what); //! These methods exists to compare two periods //! of time on the timeline. //! //! <pre> //! case predicates //! //! &lt;-- past future -&gt; //! //! |----A----| A strictly preceeds B, //! |----B----| A preceeds B //! //! |----A----| A strictly preceeds B, A preceeds B, //! |----B----| A is previous to B, A touches B //! //! |----A----| A preceeds B, //! |----B----| A overlaps B, A touches B //! //! |-------A-------| A preceeds B, A ends with B //! |----B----| A overlaps B, A contains B, A touches B, //! //! |-------A-------| A preceeds B, A succeeds B, //! |---B---| A overlaps B, A contains B, A touches B //! //! |----A----| A overlaps B, A touches B, A contains B //! |----B----| A equals B, A starts with B, A ends with B //! //! |-------A-------| A succeeds B, A starts with B //! |----B----| A overlaps B, A contains B, A touches B //! //! |----A----| A succeeds B, //! |----B----| A overlaps B, A touches B //! //! |----A----| A strictly succeeds B, A succeeds B //! |----B----| A is next to B, A touches B //! //! |----A----| A strictly succeeds B, //! |----B----| A succeeds B //! //! </pre> //! //! note: //! These methods only check the range of the first to the //! last time in the period; //! use of combined time periods (<ref>SuperTimeRange</ref>s) //! might not give you the result you want. //! //! see also: `&
78fd532000-07-12Mirar (Pontus Hagland)  //- internal method //- returns [-1,0,1] for comparison between //- (in order) begin/begin,begin/end,end/begin and end/end // virtual, default array(int(-1..1)) _compare(TimeRange what) {
325f582000-08-06Mirar (Pontus Hagland)  if (objectp(what) && what->is_supertimerange)
78fd532000-07-12Mirar (Pontus Hagland)  { array(int(-1..1)) cmp=what->_compare(this_object()); return ({-cmp[0], -cmp[2], -cmp[1], -cmp[3]}); }
325f582000-08-06Mirar (Pontus Hagland)  return ({-1,-1,-1,-1}); // error("_compare: incompatible classes %O <-> %O\n", // object_program(this_object()),object_program(what));
78fd532000-07-12Mirar (Pontus Hagland)  } string _describe_compare(array(int(-1..1)) c,TimeRange a,TimeRange b) { mapping desc=([-1:"<",0:"=",1:">"]); return sprintf("%O start %s %O start\n" "%O start %s %O end\n" "%O end %s %O start\n" "%O end %s %O end\n", a,desc[c[0]],b, a,desc[c[1]],b, a,desc[c[2]],b, a,desc[c[3]],b); } #define BEGIN_BEGIN 0 #define BEGIN_END 1 #define END_BEGIN 2 #define END_END 3 int(0..1) strictly_preceeds(TimeRange what) { array(int(-1..1)) a=_compare(what); return a[END_BEGIN]<0; } int(0..1) preceeds(TimeRange what) { array(int(-1..1)) a=_compare(what); return a[BEGIN_BEGIN]<0; } int(0..1) is_previous_to(TimeRange what) { array(int(-1..1)) a=_compare(what); return a[END_BEGIN]==0; } int(0..1) overlaps(TimeRange what) { array(int(-1..1)) a=_compare(what); return (a[END_BEGIN]>0 && a[BEGIN_END]<0); } int(0..1) contains(TimeRange what) { array(int(-1..1)) a=_compare(what); return a[BEGIN_BEGIN]<=0 && a[END_END]>=0; } int(0..1) equals(TimeRange what) { if (!objectp(what)) return 0; array(int(-1..1)) a=_compare(what); return a[BEGIN_BEGIN]==0 && a[END_END]==0; } int(0..1) is_next_to(TimeRange what) { array(int(-1..1)) a=_compare(what); return a[END_BEGIN]==0; } int(0..1) succeeds(TimeRange what) { array(int(-1..1)) a=_compare(what); return a[END_END]>0; } int(0..1) strictly_succeeds(TimeRange what) { array(int(-1..1)) a=_compare(what); return a[BEGIN_END]>0; } int(0..1) touches(TimeRange what) { array(int(-1..1)) a=_compare(what); return (a[BEGIN_END]<=0 && a[END_END]>=0) || (a[END_BEGIN]>=0 && a[BEGIN_BEGIN]<=0); } int (0..1) starts_with(TimeRange what) { array(int(-1..1)) a=_compare(what); return !a[BEGIN_BEGIN]; } int (0..1) ends_with(TimeRange what) { array(int(-1..1)) a=_compare(what); return !a[END_END]; }
dc21d42001-05-05Mirar (Pontus Hagland) //! method int(0..1) `<(TimeRange compared_to) //! method int(0..1) `>(TimeRange compared_to) //! These operators sorts roughty on the //! periods place in time. The major use //! might be to get multiset to work, //! besides sorting events clearly defined in time.
78fd532000-07-12Mirar (Pontus Hagland)  int(0..1) `<(TimeRange compared_to) { array(int(-1..1)) a=_compare(compared_to); if (a[0]<0) return 1; if (a[0]>0) return 0; if (a[3]<0) return 1; return 0; } int(0..1) `>(TimeRange compared_to) { array(int(-1..1)) a=_compare(compared_to); if (a[0]>0) return 1; if (a[0]<0) return 0; if (a[3]>0) return 1; return 0; }
dc21d42001-05-05Mirar (Pontus Hagland) //! method int(0..1) `==(TimeRange compared_to) //! method int(0..1) _equal(TimeRange compared_to) //! These two overloads the operator <tt>`==</tt> and //! the result of the <tt>equal</tt> function. //! //! a<tt>==</tt>b is considered true if the two //! timeranges are of the same type, have the same rules //! (language, timezone, etc) and are the same timerange. //! //! <tt>equal(</tt>a<tt>,</tt>b<tt>)</tt> are considered //! true if a and b are the same timerange, exactly the same //! as the <ref>equals</ref> method. //! //! The <tt>__hash</tt> method is also present, //! to make timeranges possible to use as keys in mappings. //! //! known bugs: //! _equal is not currently possible to overload, //! due to wierd bugs, so equal uses `== for now.
78fd532000-07-12Mirar (Pontus Hagland)  int(0..1) `==(TimeRange what) { return object_program(what)==object_program(this_object()) && what->ruleset()==ruleset() && equals(what); } int __hash(); // int(0..1) _equal(TimeRange what) // { // return equals(what); // }
dc21d42001-05-05Mirar (Pontus Hagland) //! method TimeRange `&(TimeRange with) //! Gives the cut on the called time period //! with another time period. The result is //! zero if the two periods doesn't overlap. //! <pre> //! &gt;- the past the future -&lt; //! |-------called-------| //! |-------other--------| //! &gt;----- cut -----&lt; //! </pre>
78fd532000-07-12Mirar (Pontus Hagland)  function ``& = `&; TimeRange|zero `&(TimeRange with, mixed ...extra) { if (with->is_nulltimerange) return with; array(int(-1..1)) a=_compare(with); if (a[END_BEGIN]<0 || a[BEGIN_END]>0) return nulltimerange; // no overlap, no extra if (with->is_supertimerange) return predef::`&(with,this_object(),@extra); // let it handle that... TimeRange from,to; // from the last beginning if (a[BEGIN_BEGIN]>0) from=beginning(); else from=with->beginning(); // to the first end if (a[END_END]<0) to=end(); else to=with->end(); // compute TimeRange res=from->distance(to); if (sizeof(extra)) return predef::`&(res,@extra); return res; }
dc21d42001-05-05Mirar (Pontus Hagland) //! method TimeRange `|(TimeRange with) //! Gives the union on the called time period //! and another time period. //! <pre> //! &gt;- the past the future -&lt; //! |-------called-------| //! |-------other--------| //! &lt;----------union----------&gt; //! </pre>
78fd532000-07-12Mirar (Pontus Hagland)  function ``| = `|; TimeRange `|(TimeRange with,mixed ...extra) { if (with->is_nulltimerange) return sizeof(extra)?`|(@extra):this_object(); array(int(-1..1)) a=_compare(with); TimeRange from,to; if (a[END_BEGIN]<0 || a[BEGIN_END]>0) from=SuperTimeRange( sort(({this_object(),with})) ); // no overlap else { if (with->is_supertimerange) // let it handle that... return predef::`|(with,this_object(),@extra); // from the first beginning if (a[BEGIN_BEGIN]<0) from=this_object(); else from=with; // to the last end if (a[END_END]>0) to=this_object(); else to=with; // compute from=from->range(to); } if (sizeof(extra)) return predef::`|(from,@extra); return from; }
dc21d42001-05-05Mirar (Pontus Hagland) //! method TimeRange `^(TimeRange with) //! Gives the exclusive-or on the called time period //! and another time period, ie the union without //! the cut. The result is zero if the //! two periods were the same. //! <pre> //! &gt;- the past the future -&lt; //! |-------called-------| //! |-------other--------| //! &lt;----| |----> - exclusive or //! </pre>
78fd532000-07-12Mirar (Pontus Hagland)  function ``^ = `^; TimeRange `^(TimeRange with,mixed ... extra) { if (with->is_supertimerange) return `^(with,this_object(),@extra); // let it handle that... if (with->is_nulltimerange) return sizeof(extra)?`^(@extra):this_object(); TimeRange res; array(int(-1..1)) a=_compare(with); // write(_describe_compare(a,this_object(),with)); TimeRange first,second; if (a[END_BEGIN]<0 || a[BEGIN_END]>0) res=SuperTimeRange( sort(({this_object(),with})) ); // no overlap else if (a[BEGIN_END]==0 || a[END_BEGIN]==0) // bordering if (a[BEGIN_BEGIN]<0) res=range(with); // A precedes B else res=with->range(this_object()); // B precedes A else if (a[BEGIN_BEGIN]==0 && a[END_END]==0) return sizeof(extra)?predef::`^(nulltimerange,@extra):nulltimerange; else { // from the first beginning to the second beginning if (a[BEGIN_BEGIN]<0) first=distance(with); else first=with->distance(this_object()); // and from the first end to the last end if (a[END_END]<0) second=end()->range(with); else second=with->end()->range(this_object()); res=first|second; } // done if (sizeof(extra)) return `^(res,@extra); return res; }
dc21d42001-05-05Mirar (Pontus Hagland) //! method TimeRange subtract(TimeRange what) //! This subtracts a period of time from another; //! <pre> //! &gt;- the past the future -&lt; //! |-------called-------| //! |-------other--------| //! &lt;----&gt; &lt;- called-&gt;subtract(other) //! //! |-------called-------| //! |---third---| //! &lt;----&gt; &lt;---> &lt;- called->subtract(third) //! </pre>
78fd532000-07-12Mirar (Pontus Hagland)  TimeRange subtract(TimeRange what,mixed ... extra) { array(int(-1..1)) a=_compare(what); if (a[END_BEGIN]<=0 || a[BEGIN_END]>=0) return sizeof(extra)?subtract(@extra):this_object(); // no overlap if (what->is_supertimerange) { array res=map(what->parts+extra,subtract)-({nulltimerange}); switch (sizeof(res)) { case 0: return nulltimerange; case 1: return res[0]; default: return predef::`&(@res); } } TimeRange res; // write(_describe_compare(a,this_object(),what)); if (a[BEGIN_BEGIN]>=0) // it preceeds us if (a[END_END]<=0) return nulltimerange; // full overlap else // half overlap at start res=what->end()->range(this_object()); else if (a[END_END]<=0) // it succeeds us res=distance(what); else { // werror("%O..\n..%O\n%O..\n..%O\n", // beginning(),what->beginning(), // what->end(),end()); // it's inside us res=predef::`|(distance(what), what->end()->range(this_object())); } if (sizeof(extra)) return res->subtract(@extra); return res; }
dc21d42001-05-05Mirar (Pontus Hagland) //! method TimeRange set_ruleset(Ruleset r) //! method TimeRange ruleset(Ruleset r) //! Set or get the current ruleset. //! note: //! this may include timezone shanges, //! and change the time of day.
78fd532000-07-12Mirar (Pontus Hagland)  TimeRange set_ruleset(Ruleset r); Ruleset ruleset() { return rules; }
dc21d42001-05-05Mirar (Pontus Hagland) //! method TimeRange set_timezone(Timezone tz) //! method TimeRange set_timezone(string tz) //! method TimeZone timezone() //! Set or get the current timezone (including dst) rule. //! //! note: //! The time-of-day may very well //! change when you change timezone. //! //! To get the time of day for a specified timezone, //! select the timezone before getting the time of day: //! //! <tt>Year(2003)-&gt;...-&gt;set_timezone(TimeZone.CET)-&gt;...-&gt;hour(14)-&gt;...</tt> //!
78fd532000-07-12Mirar (Pontus Hagland)  TimeRange set_timezone(string|Ruleset.Timezone tz) { return set_ruleset(rules->set_timezone(tz)); } Ruleset.Timezone timezone() { return rules->timezone; }
dc21d42001-05-05Mirar (Pontus Hagland) //! method TimeRange set_language(Language lang) //! method TimeRange set_language(string lang) //! method Language language() //! Set or get the current language rule.
78fd532000-07-12Mirar (Pontus Hagland)  TimeRange set_language(string|Ruleset.Language lang) { return set_ruleset(rules->set_language(lang)); } Ruleset.Language language() { return rules->language; }
dc21d42001-05-05Mirar (Pontus Hagland) //! method Calendar calendar() //! Simply gives back the calendar in use, for instance //! Calendar.ISO or Calendar.Discordian.
78fd532000-07-12Mirar (Pontus Hagland)  object calendar() { return calendar_object; } } // ----------------------------------------------------------------
dc21d42001-05-05Mirar (Pontus Hagland) //! //! module Calendar
78fd532000-07-12Mirar (Pontus Hagland) //! class SuperTimeRange //! This class handles the cases where you have a time //! period with holes. These can be created by the //! <tt>^</tt> or <tt>|</tt> operators on time ranges.
dc21d42001-05-05Mirar (Pontus Hagland) //! inherits TimeRange
78fd532000-07-12Mirar (Pontus Hagland) class cSuperTimeRange { inherit TimeRange; constant is_supertimerange=1; array parts;
dc21d42001-05-05Mirar (Pontus Hagland) //! method void create(array(TimeRange) parts) //! A SuperTimeRange must have at least two parts, //! two time ranges. Otherwise, it's either not //! a time period at all or a normal time period.
78fd532000-07-12Mirar (Pontus Hagland)  void create(array(TimeRange) _parts) { if (sizeof(_parts->is_supertimerange-({0}))) error("one part is super\n%O\n",_parts); if (sizeof(_parts)<2) error("SuperTimeRange: Too few time periods to constructor\n"); parts=_parts; } TimeRange beginning() { return parts[0]->beginning(); } TimeRange end() { return parts[-1]->end(); } TimeRange distance(TimeRange to) { return beginning()->distance(to); } TimeRange mend_overlap(array parts) { switch (sizeof(parts)) { case 0: return nulltimerange; case 1: return parts[0]; } array res=({}); TimeRange last=parts[0]; foreach (parts[1..],TimeRange part) { if (last->strictly_preceeds(part)) { res+=({last}); last=part; } else last=last|part; } if (!sizeof(res)) return last; return SuperTimeRange(res+({last})); } TimeRange `&(TimeRange with,mixed... extra) { array r=({}); foreach (parts,TimeRange part) { TimeRange tmp=predef::`&(part,with,@extra); if (tmp) if (tmp->is_supertimerange) r+=tmp->parts; else if (!tmp->is_nulltimerange) r+=({tmp}); } switch (sizeof(r)) { case 0: return nulltimerange; case 1: return r[0]; default: return SuperTimeRange(r); } } TimeRange `|(TimeRange with,mixed ...extra) { TimeRange res; if (with->is_supertimerange) res=mend_overlap(sort(with->parts+parts)); else if (with->is_nulltimerange) return this_object(); else res=mend_overlap(sort( ({with})+parts )); if (sizeof(extra)) return predef::`|(res,@extra); return res; } TimeRange subtract(TimeRange with,mixed ...extra) { array r=({}); foreach (parts,TimeRange part) r+=({part->subtract(part,with,@extra)}); return predef::`|(@r); } TimeRange `^(TimeRange with,mixed ...extra) { // werror("1 %O\n",with); // werror("2 %O\n",`|(with)); // werror("3 %O\n",`&(with)); TimeRange r=`|(with)->subtract(`&(with)); if (sizeof(extra)) return predef::`^(r,@extra); return r; } // == checks if equal int `==(TimeRange with,mixed ...extra) { if (!with->is_supertimerange) return 0; // it has to be if (sizeof(parts)!=sizeof(with->parts)) return 0; // it has to be for (int i=0; i<sizeof(parts); i++) if (parts[i]!=with->parts[i]) return 0; return sizeof(extra)?predef::`==(with,@extra):1; } // _compare wrapper array(int(-1..1)) _compare(TimeRange what) { array(int(-1..1)) a,b; a=parts[0]->_compare(what); b=parts[-1]->_compare(what); return ({a[0],a[1],b[2],b[3]}); } // `< and `> sort for multiset // a little bit heavier for super-time-ranges int(0..1) `<(TimeRange with) { array(int(-1..1)) a=_compare(with); if (a[0]<0) return 1; if (a[0]>0) return 0; if (a[3]<0) return 1; if (a[3]>0) return 0; if (!with->is_supertimerange) return 1; // always if (sizeof(parts)>sizeof(with->parts)) return 1; if (sizeof(parts)<sizeof(with->parts)) return 0; for (int i=0; i<sizeof(parts); i++) if (parts[i]<with->parts[i]) return 1; return 0; } int(0..1) `>(TimeRange with) { array(int(-1..1)) a=_compare(with); if (a[0]>0) return 1; if (a[0]<0) return 0; if (a[3]>0) return 1; if (a[3]<0) return 0; if (!with->is_supertimerange) return 0; // always if (sizeof(parts)<sizeof(with->parts)) return 1; if (sizeof(parts)>sizeof(with->parts)) return 0; for (int i=0; i<sizeof(parts); i++) if (parts[i]>with->parts[i]) return 1; return 0; } int __hash() { return predef::`+(@map(parts,"__hash")); } string _sprintf(int t) { switch (t) { case 'O': return "SuperTimeRange("+ map(parts,"_sprintf",'O')*", "+")"; } return 0; } TimeRange set_timezone(string|Timezone tz) { // fixme?
47c1832000-08-24Martin Stjernholm  return `|(@map(parts,"set_timezone",tz));
78fd532000-07-12Mirar (Pontus Hagland)  } }
dc21d42001-05-05Mirar (Pontus Hagland) //! constant TimeRange nulltimerange
78fd532000-07-12Mirar (Pontus Hagland) //! This represents the null time range, //! which, to differ from the zero time range //! (the zero-length time range), isn't placed //! in time. This is the result of for instance
dc21d42001-05-05Mirar (Pontus Hagland) //! <ref>`&</ref> between two strict non-overlapping
78fd532000-07-12Mirar (Pontus Hagland) //! timeranges - no time at all. //!
dc21d42001-05-05Mirar (Pontus Hagland) //! It has a constant, <tt>is_nulltimerange</tt>, which //! is non-zero. <tt>`!</tt> on this timerange is true.
78fd532000-07-12Mirar (Pontus Hagland) 
adb9c52000-10-18Mirar (Pontus Hagland) program NullTimeRange=cNullTimeRange; static class cNullTimeRange
78fd532000-07-12Mirar (Pontus Hagland) { inherit TimeRange; constant is_nulltimerange=1; // overload void create() { } TimeRange set_size(TimeRange|int(0..0x7fffffff) a,void|TimeRange b) { return this_object(); } TimeRange place(TimeRange what,void|int force) { return this_object(); } array(TimeRange) split(int n) { return allocate(n,this_object()); } TimeRange beginning() { return this_object(); } TimeRange end() { return this_object(); } TimeRange distance(TimeRange to) { if (to==this_object()) return this_object(); error("Can't distance/space/range with the null timerange\n"); } array(int(-1..1)) _compare(TimeRange with) { if (with==this_object()) return ({0,0,0,0}); return ({-1,-1,-1,-1}); } int(0..1) `<(TimeRange with) { return !(with==this_object()); } int(0..1) `>(TimeRange with) { return 0; } int(0..1) `==(TimeRange with) {
54bb252000-10-18Mirar (Pontus Hagland)  return objectp(with) && with->is_nulltimerange;
78fd532000-07-12Mirar (Pontus Hagland)  } int(0..1) equals(TimeRange with) {
54bb252000-10-18Mirar (Pontus Hagland)  return objectp(with) && with->is_nulltimerange;
78fd532000-07-12Mirar (Pontus Hagland)  } TimeRange `&(TimeRange with, mixed ...extra) { return predef::`&(with,this_object(),@extra); } TimeRange `|(TimeRange with, mixed ...extra) { return predef::`|(with,this_object(),@extra); } TimeRange `^(TimeRange with, mixed ...extra) { return predef::`^(with,this_object(),@extra); } this_program subtract(TimeRange with, mixed ...extra) { return this_object(); } int(1..1) `!() { return 1; } string _sprintf(int t) { switch (t) { case 'O': return "NullTimeRange"; default: return 0; } } }
adb9c52000-10-18Mirar (Pontus Hagland) cNullTimeRange nulltimerange=NullTimeRange();
78fd532000-07-12Mirar (Pontus Hagland)  // helper functions static mapping(function:TimeRange) program2stuff=([]); static TimeRange promote_program(function p) { TimeRange x; if ( (x=program2stuff[p]) ) return x; x=[object(TimeRange)]p(); if (!x->is_timerange) error("Not a timerange program: %O\n",p); return program2stuff[p]=x; }