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- <?php
- namespace Drupal\Core\Datetime\Element;
- use Drupal\Component\Utility\NestedArray;
- 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, $max_year);
- }
- return [$min_year, $max_year];
- }
- /**
- * Returns the most relevant title of a datetime element.
- *
- * Since datetime form elements often consist of combined date and time fields
- * the element title might not be located on the element itself but on the
- * parent container element.
- *
- * @param array $element
- * The element being processed.
- * @param array $complete_form
- * The complete form structure.
- *
- * @return string
- * The title.
- */
- protected static function getElementTitle($element, $complete_form) {
- $title = '';
- if (!empty($element['#title'])) {
- $title = $element['#title'];
- }
- else {
- $parents = $element['#array_parents'];
- array_pop($parents);
- $parent_element = NestedArray::getValue($complete_form, $parents);
- if (!empty($parent_element['#title'])) {
- $title = $parent_element['#title'];
- }
- }
- return $title;
- }
- }
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