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<?php |
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/** |
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* Create the iCalendar's vTimezone component |
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* |
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* @author HgO |
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* |
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* @ingroup SemanticResultFormats |
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*/ |
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class SRFTimezones { |
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private $localTimezones; |
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private $transitions; |
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private $dateFrom; |
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private $dateTo; |
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private $offsets; |
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public function __construct() { |
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global $srfgTimezones; |
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global $wgLocalTimezone; |
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if ( empty( $srfgTimezones ) ) |
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$this->localTimezones = []; |
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elseif ( is_array( $srfgTimezones ) ) |
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$this->localTimezones = $srfgTimezones; |
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elseif ( isset( $wgLocalTimezone ) ) |
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$this->localTimezones = [ $wgLocalTimezone ]; |
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else |
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$this->localTimezones = [ date_default_timezone_get() ]; |
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} |
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/** |
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* @param array $localTimezones A list of local timezones. |
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*/ |
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public function setLocalTimezones( $localTimezones ) { |
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$this->localTimezones = $localTimezones; |
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} |
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/** |
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* Set a new range for the generated transitions. |
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* |
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* @param $from Timestamp from which transitions are generated. |
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* @param $to Timestamp until which transitions are generated. |
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*/ |
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public function setRange( $from, $to ) { |
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$this->dateFrom = $from; |
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$this->dateTo = $to; |
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} |
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/** |
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* Increase the range of the generated transitions. |
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* |
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* @param int $from Timestamp from which transitions are generated. |
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* @param int $to Timestamp until which transitions are generated. |
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*/ |
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public function updateRange( $from, $to ) { |
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if ( $this->dateFrom === null || $from < $this->dateFrom ) |
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$this->dateFrom = $from; |
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if ( $this->dateTo === null || $to > $this->dateTo ) |
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$this->dateTo = $to; |
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} |
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/** |
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* Calculate transitions for each timezone. |
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*/ |
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public function calcTransitions() { |
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$this->transitions = []; |
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if ( $this->dateFrom === null || $this->dateTo === null ) |
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return false; |
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foreach ( $this->localTimezones as $timezone ) { |
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try { |
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$dateTimezone = new DateTimeZone( $timezone ); |
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} catch( Exception $e ) { |
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continue; |
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} |
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$transitions = $dateTimezone->getTransitions(); |
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$min = 0; |
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$max = 1; |
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foreach ( $transitions as $i => $transition ) { |
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if ( $transition['ts'] < $this->dateFrom ) { |
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$min = $i; |
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continue; |
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} |
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if ( $transition['ts'] > $this->dateTo ) { |
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$max = $i; |
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break; |
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} |
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} |
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$this->offsets[$timezone] = $transitions[max( $min-1, 0 )]['offset']; |
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$this->transitions[$timezone] = array_slice( $transitions, $min, $max - $min ); |
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} |
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} |
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/** |
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* Generate the transitions for a given range, for each timezones, in the iCalendar format. |
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*/ |
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public function getIcalForTimezone() { |
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if ( $this->transitions === null ) |
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return false; |
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$result = ''; |
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foreach ( $this->transitions as $timezone => $transitions ) { |
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// cf. http://www.kanzaki.com/docs/ical/vtimezone.html |
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$result .= "BEGIN:VTIMEZONE\r\n"; |
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$result .= "TZID:$timezone\r\n"; |
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$tzfrom = $this->offsets[$timezone] / 3600; |
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foreach ( $transitions as $transition ) { |
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$dst = ( $transition['isdst'] ) ? "DAYLIGHT" : "STANDARD"; |
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$result .= "BEGIN:$dst\r\n"; |
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$start_date = date( 'Ymd\THis', $transition['ts'] ); |
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$result .= "DTSTART:$start_date\r\n"; |
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$offset = $transition['offset'] / 3600; |
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$offset_from = $this->formatTimezoneOffset( $tzfrom ); |
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$result .= "TZOFFSETFROM:$offset_from\r\n"; |
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$offset_to = $this->formatTimezoneOffset( $offset ); |
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$result .= "TZOFFSETTO:$offset_to\r\n"; |
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if ( !empty( $transition['abbr'] ) ) |
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$result .= "TZNAME:{$transition['abbr']}\r\n"; |
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$result .= "END:$dst\r\n"; |
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$tzfrom = $offset; |
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} |
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$result .= "END:VTIMEZONE\r\n"; |
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} |
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return $result; |
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} |
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/** |
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* Format an integer offset to '+hhii', where hh are the hours, and ii the minutes |
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* |
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* @param int $offset |
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*/ |
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private function formatTimezoneOffset( $offset ) { |
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return sprintf('%s%02d%02d', $offset >= 0 ? '+' : '', floor($offset), ($offset - floor($offset)) * 60); |
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} |
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} |
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SemanticMediaWiki /
SemanticResultFormats
