From 0332d8dd68c9fd5f2a0422b01e936d1a944d75e3 Mon Sep 17 00:00:00 2001
From: "Mirar (Pontus Hagland)" <pike@sort.mirar.org>
Date: Thu, 26 Oct 2000 17:23:47 +0200
Subject: [PATCH] added Events.tzshift, a mechanism to figure out when a
timezone shifts
Rev: lib/modules/Calendar.pmod/Event.pmod:1.10
Rev: lib/modules/Calendar.pmod/Events.pmod:1.7
Rev: lib/modules/Calendar.pmod/Timezone.pmod:1.14
---
lib/modules/Calendar.pmod/Event.pmod | 150 ++++++++++++++++++++++--
lib/modules/Calendar.pmod/Events.pmod | 6 +-
lib/modules/Calendar.pmod/Timezone.pmod | 15 ++-
3 files changed, 159 insertions(+), 12 deletions(-)
diff --git a/lib/modules/Calendar.pmod/Event.pmod b/lib/modules/Calendar.pmod/Event.pmod
index da8298b353..027b854f67 100644
--- a/lib/modules/Calendar.pmod/Event.pmod
+++ b/lib/modules/Calendar.pmod/Event.pmod
@@ -10,6 +10,9 @@ constant M_ED=({({0,31,59,90,120,151,181,212,243,273,304,334,365}),
constant M_NAME="---JanFebMarAprMayJunJulAugSepOctNovDec"/3;
constant WD_NAME="---MonTueWedThuFriSatSun"/3;
+function(mixed...:TimeRange) std_day=master()->resolv("Calendar")["Day"];
+function(mixed...:TimeRange) std_second=master()->resolv("Calendar")["Second"];
+
// ----------------------------------------------------------------
// base classes
// ----------------------------------------------------------------
@@ -53,8 +56,8 @@ class Event
constant is_event=1;
- TimeRange next(TimeRange from,void|int(0..1) including);
- TimeRange previous(TimeRange from,void|int(0..1) including);
+ TimeRange next(void|TimeRange from,void|int(0..1) including);
+ TimeRange previous(void|TimeRange from,void|int(0..1) including);
// what events in this period?
array(TimeRange) scan(TimeRange in)
@@ -115,12 +118,12 @@ class NullEvent
name=s;
}
- TimeRange next(TimeRange from,void|int(0..1) including)
+ TimeRange next(void|TimeRange from,void|int(0..1) including)
{
return 0;
}
- TimeRange previous(TimeRange from,void|int(0..1) including)
+ TimeRange previous(void|TimeRange from,void|int(0..1) including)
{
return 0;
}
@@ -162,8 +165,9 @@ class Day_Event
int scan_jd(Calendar realm,int jd,int(1..1)|int(-1..-1) direction);
// find
- TimeRange next(TimeRange from,void|int(0..1) including)
+ TimeRange next(void|TimeRange from,void|int(0..1) including)
{
+ if (!from) from=std_day();
int jd;
if (including) jd=(int)(from->julian_day());
else jd=(int)(from->end()->julian_day());
@@ -171,8 +175,9 @@ class Day_Event
return (from->calendar()->Day)("julian_r",jd,from->ruleset())*nd;
}
- TimeRange previous(TimeRange from,void|int(0..1) including)
+ TimeRange previous(void|TimeRange from,void|int(0..1) including)
{
+ if (!from) from=std_day();
int jd;
if (including) jd=(int)(from->end()->julian_day());
else jd=(floatp(from->julian_day())
@@ -762,7 +767,7 @@ class Date_Weekday
//! This class represents the event that a given gregorian
//! day of month appears a given weekday.
//! For instance,
-//! <tt>Event.Date_Weekday(13,5)->next(Day())</tt>
+//! <tt>Event.Monthday_Weekday(13,5)->next(Day())</tt>
//! finds the next friday the 13th.
//!
//! method void create(int month_day,int weekday)
@@ -1255,3 +1260,134 @@ class SuperEvent
}
}
+class TZShift_Event
+{
+ inherit Event;
+
+ constant is_tzshift_event=1;
+
+ Ruleset.Timezone timezone;
+
+ void create(void|Ruleset.Timezone _tz)
+ {
+ timezone=_tz;
+ }
+
+ TimeRange next(void|TimeRange from,void|int(0..1) including)
+ {
+ if (!from) from=std_second();
+ return scan_shift(timezone||from->timezone(),
+ from,1,including);
+ }
+ TimeRange previous(void|TimeRange from,void|int(0..1) including)
+ {
+ if (!from) from=std_second();
+ return scan_shift(timezone||from->timezone(),
+ from,-1,including);
+ }
+
+ static TimeRange scan_shift(Ruleset.Timezone tz,
+ TimeRange from,
+ int direction,int including)
+ {
+ if (tz->whatrule)
+ return scan_history(tz,from,direction,including);
+ return scan_rule(tz,from,direction,including);
+ }
+
+ static TimeRange scan_history(Ruleset.Timezone tz,
+ TimeRange from,
+ int direction,int(0..1) including)
+ {
+ int ux;
+
+ if ((direction==1) ^ (!!including))
+ ux=(from=from->end())->unix_time();
+ else
+ ux=from->unix_time();
+
+ int nextshift=-1;
+ if (direction==1)
+ {
+ foreach (tz->shifts,int z)
+ if (z>=ux) { nextshift=z; break; }
+ }
+ else
+ foreach (reverse(tz->shifts),int z)
+ if (z<=ux) { nextshift=z; break; }
+
+ TimeRange btr=0;
+ if (nextshift!=-1)
+ btr=from->calendar()->Second("unix",nextshift);
+
+ TimeRange atr=from;
+ for (;;)
+ {
+ Ruleset.Timezone atz=tz->whatrule(ux);
+ atr=scan_rule(atz,atr,direction,including);
+ if (!atr) break;
+ if (direction==1)
+ { if (atr>=from) break; }
+ else
+ if (atr<=from) break;
+ }
+
+ if (!btr)
+ return atr;
+ if (!atr)
+ return btr;
+ if ( (direction==1)^(btr>atr) )
+ return btr;
+ else
+ return atr;
+ }
+
+ static TimeRange scan_rule(Ruleset.Timezone tz,
+ TimeRange from,
+ int direction,int including)
+ {
+ if (!tz->jd_year_periods)
+ return 0; // non-shifting timezone
+
+ int jd;
+ if ((direction==1) ^ (!!including))
+ jd=(int)(from=from->end())->julian_day();
+ else
+ jd=(int)from->julian_day();
+ [int y,int yjd,int leap_year]=gregorian_yjd(jd);
+
+ for (;;)
+ {
+ array(array) per=tz->jd_year_periods(yjd+1);
+ if (sizeof(per)==1) // no shifts this year
+ {
+ // sanity check, are we leaving all shifts behind?
+ if (direction==-1 && y<tz->firstyear) return 0;
+ if (direction==1 && y>tz->lastyear) return 0;
+ }
+ if (direction==1)
+ {
+ foreach (per[1..],array shift)
+ if (shift[0]>=jd)
+ {
+ TimeRange atr=from->calendar()
+ ->Second("unix",(shift[0]-2440588)*86400+shift[1]);
+ if (atr>=from) return atr;
+ }
+ }
+ else
+ {
+ foreach (reverse(per[1..]),array shift)
+ if (shift[0]<=jd)
+ {
+ TimeRange atr=from->calendar()
+ ->Second("unix",(shift[0]-2440588)*86400+shift[1]);
+ if (atr<=from) return atr;
+ }
+ }
+ [y,yjd,leap_year]=gregorian_year(y+direction);
+ }
+
+ return 0;
+ }
+}
diff --git a/lib/modules/Calendar.pmod/Events.pmod b/lib/modules/Calendar.pmod/Events.pmod
index ebe58270f8..74f953f787 100644
--- a/lib/modules/Calendar.pmod/Events.pmod
+++ b/lib/modules/Calendar.pmod/Events.pmod
@@ -361,7 +361,7 @@ function `-> = `[];
// Don't load Geogrphy.Countries unless we have to
object country_lookup=0;
-Event|Event.Namedays magic_event(string s)
+Event.Event|Event.Namedays magic_event(string s)
{
Event.Event e;
if ( (e=loaded_events[s]) ) return e;
@@ -375,7 +375,9 @@ Event|Event.Namedays magic_event(string s)
country_lookup=master()->resolv("Geography.Countries");
object c=country_lookup->from_name(s);
if (c && (e=find_region(lower_case(c->iso2)))) return e;
-
+
+ if (s=="tzshift")
+ return loaded_events->tzshift=Event.TZShift_Event();
return ([])[0];
}
diff --git a/lib/modules/Calendar.pmod/Timezone.pmod b/lib/modules/Calendar.pmod/Timezone.pmod
index 86c39fa339..b46848d7a9 100644
--- a/lib/modules/Calendar.pmod/Timezone.pmod
+++ b/lib/modules/Calendar.pmod/Timezone.pmod
@@ -642,6 +642,7 @@ class Runtime_timezone_compiler
array sr=({});
int mn=min(@indices(rules-(<NUL_YEAR>)));
+ int firstyear=99999,lastyear=0;
for (y=INF_YEAR;sizeof(r2);y--)
if (r2[y])
@@ -659,6 +660,8 @@ class Runtime_timezone_compiler
int y0=min(@(array)my);
int y2=max(@(array)my);
+ if (y0!=NUL_YEAR && y0<firstyear) firstyear=y0;
+ if (y2!=INF_YEAR && y2>lastyear) lastyear=y2;
for (; y0<=y2; y0++)
if (my[y0])
{
@@ -666,9 +669,11 @@ class Runtime_timezone_compiler
while (my[++y1]);
y1--;
-
+
+ // figure first and last interesting year
if (y0==NUL_YEAR)
{
+ if (y1!=NUL_YEAR && y1<firstyear) firstyear=y1;
if (my[INF_YEAR])
tr+=({" default: // .."+max(y1,mn-1),
" and ½½½..\n"});
@@ -678,8 +683,10 @@ class Runtime_timezone_compiler
}
else if (y0==y1)
tr+=({" case "+y0+":\n"});
- else if (y1==2050)
+ else if (y1==INF_YEAR)
{
+ if (y0>lastyear) lastyear=y0;
+
if (!my[NUL_YEAR])
tr+=({" case "+y0,"..:\n"});
else
@@ -705,6 +712,8 @@ class Runtime_timezone_compiler
({" }\n"
" }\n"
"\n"
+ "constant firstyear="+firstyear+";\n"
+ "constant lastyear="+lastyear+";\n",
"array(string) rule_s=\n"});
multiset tzname=(<>);
@@ -1133,7 +1142,7 @@ class Runtime_timezone_compiler
if (sscanf(line,"Rule%*[ \t]%[^ \t]%*[ \t]%s",a,b)==4 &&
a==s)
r->add(b);
- else
+ else if (sscanf(line,"%*[ ]#%*s")<2)
break; // end of zone
#ifdef RTTZC_TIMING
float tf=time(t);
--
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