IconsTwigExtension.php

<?php

declare (strict_types=1);
namespace Drupal\Core\Template;

use Twig\Extension\AbstractExtension;
use Twig\TwigFunction;

/**
 * Twig extension for icon.
 *
 * @internal
 */
final class IconsTwigExtension extends AbstractExtension {
    
    /**
     * {@inheritdoc}
     */
    public function getFunctions() : array {
        return [
            new TwigFunction('icon', [
                $this,
                'getIconRenderable',
            ]),
        ];
    }
    
    /**
     * Get an icon renderable array.
     *
     * @param string|null $pack_id
     *   The icon set ID.
     * @param string|null $icon_id
     *   The icon ID.
     * @param array|null $settings
     *   An array of settings for the icon.
     *
     * @return array
     *   The icon renderable.
     */
    public function getIconRenderable(?string $pack_id, ?string $icon_id, ?array $settings = []) : array {
        if (!$pack_id || !$icon_id) {
            return [];
        }
        return [
            '#type' => 'icon',
            '#pack_id' => $pack_id,
            '#icon_id' => $icon_id,
            '#settings' => $settings,
        ];
    }

}