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| <?php | |
| /** | |
| * @file | |
| * Contains \Drupal\Core\Datetime\Element\DateElementBase. | |
| */ | |
| namespace Drupal\Core\Datetime\Element; | |
| use Drupal\Core\Datetime\DrupalDateTime; | |
| use Drupal\Core\Render\Element\FormElement; | |
| /** | |
| * Provides a base class for date elements. | |
| */ | |
| abstract class DateElementBase extends FormElement { | |
| /** | |
| * Specifies the start and end year to use as a date range. | |
| * | |
| * Handles a string like -3:+3 or 2001:2010 to describe a dynamic range of | |
| * minimum and maximum years to use in a date selector. | |
| * | |
| * Centers the range around the current year, if any, but expands it far enough | |
| * so it will pick up the year value in the field in case the value in the field | |
| * is outside the initial range. | |
| * | |
| * @param string $string | |
| * A min and max year string like '-3:+1' or '2000:2010' or '2000:+3'. | |
| * @param object $date | |
| * (optional) A date object to test as a default value. Defaults to NULL. | |
| * | |
| * @return array | |
| * A numerically indexed array, containing the minimum and maximum year | |
| * described by this pattern. | |
| */ | |
| protected static function datetimeRangeYears($string, $date = NULL) { | |
| $datetime = new DrupalDateTime(); | |
| $this_year = $datetime->format('Y'); | |
| list($min_year, $max_year) = explode(':', $string); | |
| // Valid patterns would be -5:+5, 0:+1, 2008:2010. | |
| $plus_pattern = '@[\+|\-][0-9]{1,4}@'; | |
| $year_pattern = '@^[0-9]{4}@'; | |
| if (!preg_match($year_pattern, $min_year, $matches)) { | |
| if (preg_match($plus_pattern, $min_year, $matches)) { | |
| $min_year = $this_year + $matches[0]; | |
| } | |
| else { | |
| $min_year = $this_year; | |
| } | |
| } | |
| if (!preg_match($year_pattern, $max_year, $matches)) { | |
| if (preg_match($plus_pattern, $max_year, $matches)) { | |
| $max_year = $this_year + $matches[0]; | |
| } | |
| else { | |
| $max_year = $this_year; | |
| } | |
| } | |
| // We expect the $min year to be less than the $max year. Some custom values | |
| // for -99:+99 might not obey that. | |
| if ($min_year > $max_year) { | |
| $temp = $max_year; | |
| $max_year = $min_year; | |
| $min_year = $temp; | |
| } | |
| // If there is a current value, stretch the range to include it. | |
| $value_year = $date instanceof DrupalDateTime ? $date->format('Y') : ''; | |
| if (!empty($value_year)) { | |
| $min_year = min($value_year, $min_year); | |
| $max_year = max($value_year, $max_year); | |
| } | |
| return array($min_year, $max_year); | |
| } | |
| } | |