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We now postpone parsing of AT until we have the GMTOFFSET handy; some reorganization of the returned arrays, and starting to prepare the rationalized DST entries for Moodle DST table

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martinlanghoff 2005-03-04 12:05:26 +00:00
parent 720e6293ad
commit af2309e366
1 changed files with 88 additions and 12 deletions
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100
lib/olson.php
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@ -1,10 +1,78 @@
<?php //$Id$
/***
*** olson_todst ($filename)
***
*** Parses the olson files for Zones and DST rules.
*** It updates the Moodle database with the Zones/DST rules
***
*** Returns true/false
***
*/
function olson_todst ($filename) {
$zones = olson_simple_zone_parser($filename);
$rules = olson_simple_rule_parser($filename);
if (function_exists('memory_get_usage')) {
trigger_error("We are consuming memory: " . get_memory_usage());
}
/**
*** To translate the combined Zone & Rule changes
*** in the Olson files to the Moodle single ruleset
*** format, wwe need to trasverse every year and see
*** if either the Zone or the relevant Rule has a
*** change. It's yuck but it yealds a rationalized
*** set of data, which is arguably simpler.
***
*** Also note that I am starting at the epoch (1970)
*** because I don't think we'll see many events scheduled
*** before that, anyway.
***
**/
$maxyear = localtime(time(), true);
$maxyear = $maxyear['tm_year'] + 1900 + 10;
foreach ($zones as $zname=>$zbyyear) { // loop over zones
// loop over years
$lastyear = '1970';
$lastzone = NULL;
$lastrule = NULL;
$lastzonerule = NULL;
for ($y = 1970 ; $y < $maxyear ; $y++) {
/// force it to string to avoid PHP
/// thinking of a positional array
if (array_key_exists((string)$y, $zbyyear )) { // we have a zone entry for the year
$lastyear = $y;
$zentry = $zbyyear[$y];
$lastzone = $zentry;
print "$zname $y $zentry[rule]\n";
}
// has a tz entry
// has a rule entry
}
}
/*
$zones = getzones
foreach $zones as $zone
foreach $year
offset & rule(rulename/yearstart) ... is it the same as last?
*/
}
/***
*** olson_simple_rule_parser($filename)
***
*** Parses the olson files for DST rules.
*** It's a simple implementation that captures the
*** most up-to-date DST rule for each ruleset.
*** It's a simple implementation that simplifies some fields
***
*** Returns a multidimensional array, or false on error
***
@ -50,8 +118,12 @@ function olson_simple_rule_parser ($filename) {
fclose($file);
$months = array('jan' => 1, 'feb' => 2, 'mar' => 3, 'apr' => 4, 'may' => 5, 'jun' => 6,
'jul' => 7, 'aug' => 8, 'sep' => 9, 'oct' => 10, 'nov' => 11, 'dec' => 12);
$months = array('jan' => 1, 'feb' => 2,
'mar' => 3, 'apr' => 4,
'may' => 5, 'jun' => 6,
'jul' => 7, 'aug' => 8,
'sep' => 9, 'oct' => 10,
'nov' => 11, 'dec' => 12);
// now reformat it a bit to match Moodle's DST table
@ -92,7 +164,8 @@ function olson_simple_rule_parser ($filename) {
list($hours, $mins) = explode(':', $save);
$save = $hours * 60 + $mins;
$at = olson_parse_at($at);
// we'll parse $at later
// $at = olson_parse_at($at);
$in = strtolower($in);
if(!isset($months[$in])) {
trigger_error('Unknown month: '.$in);
@ -122,7 +195,8 @@ function olson_simple_rule_parser ($filename) {
$save,
$letter) = $rulesthisyear['reset'];
$at = olson_parse_at($at);
// we'll parse $at later
// $at = olson_parse_at($at);
$in = strtolower($in);
if(!isset($months[$in])) {
trigger_error('Unknown month: '.$in);
@ -204,7 +278,8 @@ function olson_simple_zone_parser ($filename) {
$zone['until'] = $line[5];
}
$zone['from'] = '1970';
$zones[$zone['name']] = array();
} else if (!empty($lastzone) && preg_match('/^\s+/', $line)){
// looks like a credible continuation line
@ -242,7 +317,7 @@ function olson_simple_zone_parser ($filename) {
$zone['rule'] = '';
}
$zones[] = $zone;
$zones[$zone['name']][(string)$zone['from']] = $zone;
}
return $zones;
@ -331,7 +406,7 @@ function olson_parse_on ($on) {
/***
*** olson_parse_at($on)
*** olson_parse_at($at)
***
*** see `man zic`. This function translates
***
@ -346,9 +421,11 @@ function olson_parse_on ($on) {
*** sal time; in the absence of an indicator, wall clock time is
*** assumed.
***
*** returns a moodle friendly $at
*** returns a moodle friendly $at, in GMT, which is what Moodle wants
***
***
*/
function olson_parse_at ($at, $set = 'set') {
function olson_parse_at ($at, $set = 'set', $gmtoffset) {
list($hours, $mins) = explode(':', $at);
@ -364,7 +441,6 @@ function olson_parse_at ($at, $set = 'set') {
if ($set !== 'set'){ // wall clock is on DST, assume by 1hr
$hours = $hours-1;
}
trigger_error('TOOD turn this time to gmt');
return sprintf('%02d:%02d', $hours, $mins);
}