wp-bootstrap/inc/Twig/TwigService.php

<?php
/**
 * Twig Template Engine Service.
 *
 * @package WPBootstrap
 * @since 0.0.1
 */

namespace WPBootstrap\Twig;

use Twig\Environment;
use Twig\Loader\FilesystemLoader;
use Twig\TwigFunction;

class TwigService
{
    private static ?TwigService $instance = null;
    private Environment $twig;

    private function __construct()
    {
        $viewsDir = get_template_directory() . '/views';
        $cacheDir = WP_CONTENT_DIR . '/cache/twig';

        $loader = new FilesystemLoader($viewsDir);
        $this->twig = new Environment($loader, [
            'cache' => WP_DEBUG ? false : $cacheDir,
            'debug' => WP_DEBUG,
            'auto_reload' => true,
        ]);

        $this->registerWordPressFunctions();
    }

    public static function getInstance(): self
    {
        if (self::$instance === null) {
            self::$instance = new self();
        }
        return self::$instance;
    }

    public function render(string $template, array $context = []): string
    {
        return $this->twig->render($template, $context);
    }

    public function display(string $template, array $context = []): void
    {
        $this->twig->display($template, $context);
    }

    public function getEnvironment(): Environment
    {
        return $this->twig;
    }

    private function registerWordPressFunctions(): void
    {
        $this->twig->addFunction(new TwigFunction('__', function (string $text, string $domain = 'wp-bootstrap'): string {
            return __($text, $domain);
        }));

        $this->twig->addFunction(new TwigFunction('_e', function (string $text, string $domain = 'wp-bootstrap'): void {
            _e($text, $domain);
        }));

        $this->twig->addFunction(new TwigFunction('esc_html', 'esc_html'));
        $this->twig->addFunction(new TwigFunction('esc_attr', 'esc_attr'));
        $this->twig->addFunction(new TwigFunction('esc_url', 'esc_url'));
    }
}