persian_date.module

<?php

/**
 * @file
 * Contains persian_date.module.
 */

use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\persian_date\PersianLanguageDiscovery;


/**
 * Implements hook_help().
 */
function persian_date_help($route_name, RouteMatchInterface $route_match)
{
    switch ($route_name) {
        // Main module help for the persian_date module.
        case 'help.page.persian_date':
            $twig = \Drupal::getContainer()->get('twig');
            $output = $twig->renderInline(file_get_contents(__DIR__ . '/resources/templates/help.html.twig'));
            return $output;

        default:
    }
}

/**
 * Replace form elements with persian ones
 *
 * Implements hook_element_info_alter().
 */
function persian_date_element_info_alter(array &$info)
{
    if (!PersianLanguageDiscovery::isPersian()) {
        return;
    }

    $elements = array_intersect_key($info, array_flip(['date', 'datetime', 'datelist']));
    foreach ($elements as $name => &$config) {
        if (isset($config['#process'])) {
            foreach ($config['#process'] as &$process) {
                if (is_array($process)) {
                    $process[0] = replace_with_equivalent_module_class($process[0]);
                }
            }
        }

        if (isset($config['#pre_render'])) {
            foreach ($config['#pre_render'] as &$process) {
                if (is_array($process)) {
                    $process[0] = replace_with_equivalent_module_class($process[0]);
                }
            }
        }
        if (isset($config['#element_validate'])) {
            foreach ($config['#element_validate'] as &$process) {
                if (is_array($process)) {
                    $process[0] = replace_with_equivalent_module_class($process[0]);
                }
            }
        }

        if (isset($config['#value_callback'])) {
            if (is_array($config['#value_callback'])) {
                $config['#value_callback'][0] = replace_with_equivalent_module_class($config['#value_callback'][0]);
            }
        }


    }
    $info = array_merge($info, $elements);
}

// helper method to replace classes
function replace_with_equivalent_module_class($string)
{
    $replacements = [
        \Drupal\Core\Datetime\Element\Datelist::class => \Drupal\persian_date\Element\PersianDateList::class,
        \Drupal\Core\Render\Element\Date::class => \Drupal\persian_date\Element\PersianDate::class,
        \Drupal\Core\Datetime\Element\Datetime::class => \Drupal\persian_date\Element\PersianDateTime::class,
    ];

    foreach ($replacements as $search => $replacement) {
        $string = str_replace($search, $replacement, $string);
    }

    return $string;
}

/**
 * Replace date widgets with persian widgets
 *
 * Implements hook_field_widget_info_alter().
 */
function persian_date_field_widget_info_alter(array &$info)
{
    if (!PersianLanguageDiscovery::isPersian()) {
        return;
    }
    // Let a new field type re-use an existing widget.
    $info['datetime_default']['class'] = \Drupal\persian_date\Plugin\Field\FieldWidget\PersianDateTimeDefaultWidget::class;
    $info['datetime_datelist']['class'] = \Drupal\persian_date\Plugin\Field\FieldWidget\PersianDateTimeDatelistWidget::class;
    $info['datetime_timestamp']['class'] = \Drupal\persian_date\Plugin\Field\FieldWidget\PersianTimestampDateTimeDefaultWidget::class;
    $info['datetime_timestamp']['provider'] = 'persian_date';
}