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<?php |
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namespace Agavi\Date; |
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// +---------------------------------------------------------------------------+ |
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// | This file is part of the Agavi package. | |
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// | Copyright (c) 2005-2011 the Agavi Project. | |
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// | | |
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// | For the full copyright and license information, please view the LICENSE | |
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// | file that was distributed with this source code. You can also view the | |
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// | LICENSE file online at http://www.agavi.org/LICENSE.txt | |
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// | vi: set noexpandtab: | |
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// | Local Variables: | |
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// | indent-tabs-mode: t | |
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// | End: | |
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// +---------------------------------------------------------------------------+ |
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use Agavi\Exception\AgaviException; |
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use Agavi\Translation\TranslationManager; |
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use Agavi\Util\Toolkit; |
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/** |
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* A time zone based on the Olson database. Olson time zones change behavior |
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* over time. The raw offset, rules, presence or absence of daylight savings |
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* time, and even the daylight savings amount can all vary. |
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* |
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* Ported from ICU: |
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* icu/trunk/source/i18n/olsontz.cpp r19133 |
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* icu/trunk/source/i18n/olsontz.h r18762 |
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* |
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* @package agavi |
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* @subpackage date |
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* |
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* @author Dominik del Bondio <[email protected]> |
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* @author The ICU Project |
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* @copyright Authors |
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* @copyright The Agavi Project |
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* |
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* @since 0.11.0 |
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* |
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* @version $Id$ |
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*/ |
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class OlsonTimeZone extends TimeZone |
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{ |
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/** |
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* The transitions |
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* |
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* @var array |
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* @since 0.11.0 |
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*/ |
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protected $transitions; |
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/** |
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* The types, 1..255 |
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* |
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* @var array |
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* @since 0.11.0 |
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*/ |
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protected $types; |
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/** |
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* The last year for which the transitions data are to be used |
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* rather than the finalZone. If there is no finalZone, then this |
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* is set to INT32_MAX. NOTE: This corresponds to the year _before_ |
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* the one indicated by finalMillis. |
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* |
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* @var int |
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* @since 0.11.0 |
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*/ |
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protected $finalYear; |
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/** |
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* The millis for the start of the first year for which finalZone |
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* is to be used, or DBL_MAX if finalZone is 0. NOTE: This is |
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* 0:00 GMT Jan 1, <finalYear + 1> (not <finalMillis>). |
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* |
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* @var float |
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* @since 0.11.0 |
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*/ |
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protected $finalMillis; |
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/** |
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* A SimpleTimeZone that governs the behavior for years > finalYear. |
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* If and only if finalYear == INT32_MAX then finalZone == 0. |
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* |
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* @var SimpleTimeZone |
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* @since 0.11.0 |
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*/ |
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protected $finalZone; // owned, may be NULL |
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const MAX_INT = 2147483647; |
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const MAX_DBL = Calendar::MAX_MILLIS; |
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/** |
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* Constructor |
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* |
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* @see AgaviOlsonTimeZone::constructor() |
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* @see AgaviOlsonTimeZone::constructorOSA() |
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* |
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* @author Dominik del Bondio <[email protected]> |
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* @author The ICU Project |
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* @since 0.11.0 |
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*/ |
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public function __construct() |
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{ |
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$arguments = func_get_args(); |
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if (count($arguments) == 1) { |
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parent::__construct($arguments[0]); |
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return; |
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} |
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$fName = Toolkit::overloadHelper(array( |
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array('name' => 'constructorOSA', |
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'parameters' => array('object', 'string', 'array')), |
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), |
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$arguments |
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); |
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call_user_func_array(array($this, $fName), $arguments); |
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} |
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/** |
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* Default constructor. Creates a time zone with an empty ID and |
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* a fixed GMT offset of zero. |
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* |
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* @author Dominik del Bondio <[email protected]> |
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* @author The ICU Project |
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* @since 0.11.0 |
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*/ |
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protected function constructor() |
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{ |
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$this->finalYear = self::MAX_INT; |
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$this->finalMillis = self::MAX_DBL; |
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$this->finalZone = null; |
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$this->constructEmpty(); |
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} |
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/** |
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* Construct a GMT+0 zone with no transitions. This is done when a |
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* constructor fails so the resultant object is well-behaved. |
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* |
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* @author Dominik del Bondio <[email protected]> |
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* @author The ICU Project |
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* @since 0.11.0 |
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*/ |
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protected function constructEmpty() |
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{ |
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$this->transitionCount = 0; |
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$this->transitions = array(); |
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// TODO: this should probably contain at least one item |
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$this->types = array(); |
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} |
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/** |
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* Construct with info from an array. |
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* |
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* @param TranslationManager $tm The translation manager. |
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* @param string $id The id. |
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* @param array $zoneInfo The zone info data. |
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* |
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* @author Dominik del Bondio <[email protected]> |
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* @author The ICU Project |
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* @since 0.11.0 |
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*/ |
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protected function constructorOSA(TranslationManager $tm, $id, array $zoneInfo) |
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{ |
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parent::__construct($tm, $id); |
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$this->finalYear = self::MAX_INT; |
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$this->finalMillis = self::MAX_DBL; |
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$this->finalZone = null; |
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foreach ($zoneInfo['rules'] as $rule) { |
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$this->transitions[] = $rule; |
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} |
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$this->types = $zoneInfo['types']; |
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if (!isset($zoneInfo['finalRule'])) { |
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throw new AgaviException($id); |
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} |
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// Subtract one from the actual final year; we actually store final year - 1, |
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// and compare using > rather than >=. This allows us to use INT32_MAX as |
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// an exclusive upper limit for all years, including INT32_MAX. |
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$rawOffset = $zoneInfo['finalRule']['offset'] * DateDefinitions::MILLIS_PER_SECOND; |
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$this->finalYear = $zoneInfo['finalRule']['startYear'] - 1; |
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// Also compute the millis for Jan 1, 0:00 GMT of the finalYear. This reduces runtime computations. |
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$this->finalMillis = CalendarGrego::fieldsToDay($zoneInfo['finalRule']['startYear'], 0, 1) * DateDefinitions::MILLIS_PER_DAY; |
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if ($zoneInfo['finalRule']['type'] == 'dynamic') { |
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$fr = $zoneInfo['finalRule']; |
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$this->finalZone = new SimpleTimeZone( |
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$tm, $rawOffset, $id, |
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$fr['start']['month'], $fr['start']['date'], $fr['start']['day_of_week'], $fr['start']['time'], $fr['start']['type'], |
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$fr['end']['month'], $fr['end']['date'], $fr['end']['day_of_week'], $fr['end']['time'], $fr['end']['type'], |
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$fr['save'] * DateDefinitions::MILLIS_PER_SECOND |
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); |
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} else { |
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$this->finalZone = new SimpleTimeZone($tm, $rawOffset, $id); |
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} |
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} |
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/** |
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* Returns true if the two TimeZone objects are equal. |
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* |
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* @param TimeZone $that The timezone to compare against. |
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* |
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* @author Dominik del Bondio <[email protected]> |
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* @author The ICU Project |
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* @since 0.11.0 |
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*/ |
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View Code Duplication |
function __is_equal(TimeZone $that) |
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{ |
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// TODO: we need to compare finalyear and the transitions and finalzone |
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return ($this === $that || |
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(get_class($this) == get_class($that) && |
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TimeZone::__is_equal($that) |
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)); |
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} |
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/** |
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* TimeZone API. |
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* |
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* @see TimeZone::getOffsetIIIIII() |
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* |
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* @author Dominik del Bondio <[email protected]> |
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* @author The ICU Project |
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* @since 0.11.0 |
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*/ |
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View Code Duplication |
protected function getOffsetIIIIII($era, $year, $month, $dom, $dow, $millis) |
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{ |
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if ($month < DateDefinitions::JANUARY || $month > DateDefinitions::DECEMBER) { |
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throw new \InvalidArgumentException('Month out of range'); |
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} else { |
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return $this->getOffsetIIIIIII($era, $year, $month, $dom, $dow, $millis, CalendarGrego::monthLength($year, $month)); |
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} |
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} |
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/** |
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* TimeZone API. |
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* |
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* @see TimeZone::getOffsetIIIIIII() |
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* |
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* @author Dominik del Bondio <[email protected]> |
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* @author The ICU Project |
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* @since 0.11.0 |
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*/ |
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protected function getOffsetIIIIIII($era, $year, $month, $dom, $dow, $millis, $monthLength) |
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{ |
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if (($era != GregorianCalendar::AD && $era != GregorianCalendar::BC) |
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|| $month < DateDefinitions::JANUARY |
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|| $month > DateDefinitions::DECEMBER |
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|| $dom < 1 |
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|| $dom > $monthLength |
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|| $dow < DateDefinitions::SUNDAY |
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|| $dow > DateDefinitions::SATURDAY |
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|| $millis < 0 |
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|| $millis >= DateDefinitions::MILLIS_PER_DAY |
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|| $monthLength < 28 |
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|| $monthLength > 31) { |
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throw new \InvalidArgumentException('One of the supplied parameters is out of range'); |
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} |
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if ($era == GregorianCalendar::BC) { |
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$year = -$year; |
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} |
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if ($year > $this->finalYear) { // [sic] >, not >=; see above |
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return $this->finalZone->getOffset($era, $year, $month, $dom, $dow, $millis, $monthLength); |
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} |
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// Compute local epoch seconds from input fields |
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$time = CalendarGrego::fieldsToDay($year, $month, $dom) * DateDefinitions::SECONDS_PER_DAY + floor($millis / DateDefinitions::MILLIS_PER_SECOND); |
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$transition = $this->findTransition($time, true); |
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return ($this->types[$transition['type']]['dstOffset'] + $this->types[$transition['type']]['rawOffset']) * DateDefinitions::MILLIS_PER_SECOND; |
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} |
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/** |
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* TimeZone API. |
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* |
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* @see TimeZone::getOffsetRef() |
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* |
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* @author Dominik del Bondio <[email protected]> |
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* @author The ICU Project |
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* @since 0.11.0 |
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*/ |
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public function getOffsetRef($date, $local, &$rawoff, &$dstoff) |
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{ |
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// The check against finalMillis will suffice most of the time, except |
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// for the case in which finalMillis == DBL_MAX, date == DBL_MAX, |
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// and finalZone == 0. For this case we add "&& finalZone != 0". |
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if ($date >= $this->finalMillis && $this->finalZone !== null) { |
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$millis = 0; |
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$days = Toolkit::floorDivide($date, DateDefinitions::MILLIS_PER_DAY, $millis); |
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$year = 0; |
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$month = 0; |
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$dom = 0; |
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$dow = 0; |
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CalendarGrego::dayToFields($days, $year, $month, $dom, $dow); |
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$rawoff = $this->finalZone->getRawOffset(); |
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if (!$local) { |
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// Adjust from GMT to local |
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$date += $rawoff; |
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$days2 = Toolkit::floorDivide($date, DateDefinitions::MILLIS_PER_DAY, $millis); |
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if ($days2 != $days) { |
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CalendarGrego::dayToFields($days2, $year, $month, $dom, $dow); |
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} |
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} |
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$dstoff = $this->finalZone->getOffset(GregorianCalendar::AD, $year, $month, $dom, $dow, $millis) - $rawoff; |
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return; |
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} |
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$secs = floor($date / DateDefinitions::MILLIS_PER_SECOND); |
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$transition = $this->findTransition($secs, $local); |
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$rawoff = $this->types[$transition['type']]['rawOffset'] * DateDefinitions::MILLIS_PER_SECOND; |
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$dstoff = $this->types[$transition['type']]['dstOffset'] * DateDefinitions::MILLIS_PER_SECOND; |
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} |
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/** |
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* TimeZone API. |
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* |
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* @see TimeZone::setRawOffset() |
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* |
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* @author Dominik del Bondio <[email protected]> |
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* @author The ICU Project |
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* @since 0.11.0 |
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*/ |
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public function setRawOffset($offsetMillis) |
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{ |
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// We don't support this operation, since OlsonTimeZones are |
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// immutable (except for the ID, which is in the base class). |
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// Nothing to do! |
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} |
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/** |
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* TimeZone API. |
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* |
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* @see TimeZone::getRawOffset() |
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* |
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* @author Dominik del Bondio <[email protected]> |
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* @author The ICU Project |
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* @since 0.11.0 |
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*/ |
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public function getRawOffset() |
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{ |
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$raw = 0; |
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$dst = 0; |
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$this->getOffsetRef(Calendar::getNow(), false, $raw, $dst); |
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return $raw; |
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} |
356
|
|
|
|
357
|
|
|
/** |
358
|
|
|
* Find the smallest i (in 0..transitionCount-1) such that time >= |
359
|
|
|
* transition(i), where transition(i) is either the GMT or the local |
360
|
|
|
* transition time, as specified by `local'. |
361
|
|
|
* |
362
|
|
|
* @param float $time epoch seconds, either GMT or local wall |
363
|
|
|
* @param bool $local if TRUE, `time' is in local wall units, otherwise it |
364
|
|
|
* is GMT |
365
|
|
|
* |
366
|
|
|
* @return int an index i, where 0 <= i < transitionCount, and |
367
|
|
|
* transition(i) <= time < transition(i+1), or i == 0 if |
368
|
|
|
* transitionCount == 0 or time < transition(0). |
369
|
|
|
* |
370
|
|
|
* @author Dominik del Bondio <[email protected]> |
371
|
|
|
* @author The ICU Project |
372
|
|
|
* @since 0.11.0 |
373
|
|
|
*/ |
374
|
|
|
protected function findTransition($time, $local) |
375
|
|
|
{ |
376
|
|
|
$i = 0; |
377
|
|
|
|
378
|
|
|
if (count($this->transitions) > 0) { |
379
|
|
|
// Linear search from the end is the fastest approach, since |
380
|
|
|
// most lookups will happen at/near the end. |
381
|
|
|
for ($i = count($this->transitions) - 1; $i > 0; --$i) { |
382
|
|
|
$transition = $this->transitions[$i]; |
383
|
|
|
if ($local) { |
384
|
|
|
$prevType = $this->transitions[$i - 1]['type']; |
385
|
|
|
$zoneOffsetPrev = $this->types[$prevType]['dstOffset'] + $this->types[$prevType]['rawOffset']; |
386
|
|
|
$currType = $transition['type']; |
387
|
|
|
$zoneOffsetCurr = $this->types[$currType]['dstOffset'] + $this->types[$currType]['rawOffset']; |
388
|
|
|
|
389
|
|
|
// use the lowest offset ( == standard time ). as per tzregts.cpp which says: |
390
|
|
|
|
391
|
|
|
/** |
392
|
|
|
* @bug 4084933 |
393
|
|
|
* The expected behavior of TimeZone around the boundaries is: |
394
|
|
|
* (Assume transition time of 2:00 AM) |
395
|
|
|
* day of onset 1:59 AM STD = display name 1:59 AM ST |
396
|
|
|
* 2:00 AM STD = display name 3:00 AM DT |
397
|
|
|
* day of end 0:59 AM STD = display name 1:59 AM DT |
398
|
|
|
* 1:00 AM STD = display name 1:00 AM ST |
399
|
|
|
*/ |
400
|
|
|
if ($zoneOffsetPrev < $zoneOffsetCurr) { |
401
|
|
|
$transition['time'] += $zoneOffsetPrev; |
402
|
|
|
} else { |
403
|
|
|
$transition['time'] += $zoneOffsetCurr; |
404
|
|
|
} |
405
|
|
|
} |
406
|
|
|
|
407
|
|
|
if ($time >= $transition['time']) { |
408
|
|
|
break; |
409
|
|
|
} |
410
|
|
|
} |
411
|
|
|
} |
412
|
|
|
|
413
|
|
|
return $this->transitions[$i]; |
414
|
|
|
} |
415
|
|
|
|
416
|
|
|
/** |
417
|
|
|
* TimeZone API. |
418
|
|
|
* |
419
|
|
|
* @see TimeZone::useDaylightTime() |
420
|
|
|
* |
421
|
|
|
* @author Dominik del Bondio <[email protected]> |
422
|
|
|
* @author The ICU Project |
423
|
|
|
* @since 0.11.0 |
424
|
|
|
*/ |
425
|
|
|
public function useDaylightTime() |
426
|
|
|
{ |
427
|
|
|
// If DST was observed in 1942 (for example) but has never been |
428
|
|
|
// observed from 1943 to the present, most clients will expect |
429
|
|
|
// this method to return FALSE. This method determines whether |
430
|
|
|
// DST is in use in the current year (at any point in the year) |
431
|
|
|
// and returns TRUE if so. |
432
|
|
|
|
433
|
|
|
$days = floor(Calendar::getNow() / DateDefinitions::MILLIS_PER_DAY); // epoch days |
434
|
|
|
|
435
|
|
|
$year = 0; |
436
|
|
|
$month = 0; |
437
|
|
|
$dom = 0; |
438
|
|
|
$dow = 0; |
439
|
|
|
|
440
|
|
|
CalendarGrego::dayToFields($days, $year, $month, $dom, $dow); |
441
|
|
|
|
442
|
|
|
if ($year > $this->finalYear) { // [sic] >, not >=; see above |
443
|
|
|
if ($this->finalZone) { |
444
|
|
|
return $this->finalZone->useDaylightTime(); |
445
|
|
|
} else { |
446
|
|
|
return true; |
447
|
|
|
} |
448
|
|
|
} |
449
|
|
|
|
450
|
|
|
// Find start of this year, and start of next year |
451
|
|
|
$start = (int) CalendarGrego::fieldsToDay($year, 0, 1) * DateDefinitions::SECONDS_PER_DAY; |
452
|
|
|
$limit = (int) CalendarGrego::fieldsToDay($year + 1, 0, 1) * DateDefinitions::SECONDS_PER_DAY; |
453
|
|
|
|
454
|
|
|
// Return TRUE if DST is observed at any time during the current year. |
455
|
|
|
for ($i = 0, $transitionCount = count($this->transitions); $i < $transitionCount; ++$i) { |
456
|
|
|
if ($this->transitions[$i]['time'] >= $limit) { |
457
|
|
|
break; |
458
|
|
|
} |
459
|
|
|
if (($this->transitions[$i]['time'] >= $start && $this->types[$this->transitions[$i]['type']]['dstOffset'] != 0) || ($this->transitions[$i]['time'] > $start && $i > 0 && $this->types[$this->transitions[$i-1]['type']]['dstOffset'] != 0)) { |
460
|
|
|
return true; |
461
|
|
|
} |
462
|
|
|
} |
463
|
|
|
|
464
|
|
|
return false; |
465
|
|
|
} |
466
|
|
|
|
467
|
|
|
/** |
468
|
|
|
* TimeZone API. |
469
|
|
|
* |
470
|
|
|
* @see TimeZone::getDSTSavings() |
471
|
|
|
* |
472
|
|
|
* @author Dominik del Bondio <[email protected]> |
473
|
|
|
* @author The ICU Project |
474
|
|
|
* @since 0.11.0 |
475
|
|
|
*/ |
476
|
|
|
public function getDSTSavings() |
477
|
|
|
{ |
478
|
|
|
if ($this->finalZone !== null) { |
479
|
|
|
return $this->finalZone->getDSTSavings(); |
480
|
|
|
} |
481
|
|
|
return parent::getDSTSavings(); |
482
|
|
|
} |
483
|
|
|
|
484
|
|
|
/** |
485
|
|
|
* TimeZone API. |
486
|
|
|
* |
487
|
|
|
* @see TimeZone::inDaylightTime() |
488
|
|
|
* |
489
|
|
|
* @author Dominik del Bondio <[email protected]> |
490
|
|
|
* @author The ICU Project |
491
|
|
|
* @since 0.11.0 |
492
|
|
|
*/ |
493
|
|
|
public function inDaylightTime($date) |
494
|
|
|
{ |
495
|
|
|
$raw = 0; |
496
|
|
|
$dst = 0; |
497
|
|
|
$this->getOffsetRef($date, false, $raw, $dst); |
498
|
|
|
return $dst != 0; |
499
|
|
|
} |
500
|
|
|
} |
501
|
|
|
|
In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: