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Edit File: Handlebars.php

<?php // phpcs:ignore SlevomatCodingStandard.TypeHints.DeclareStrictTypes.DeclareStrictTypesMissing

namespace MailPoet\Twig;

if (!defined('ABSPATH')) exit;

use MailPoetVendor\Twig\Extension\AbstractExtension;
use MailPoetVendor\Twig\Extension\CoreExtension;
use MailPoetVendor\Twig\TwigFunction;

class Handlebars extends AbstractExtension {
  public function getFunctions() {
    return [
      new TwigFunction(
        'partial',
        [
          $this,
          'generatePartial',
        ],
        [
          'needs_environment' => true,
          'needs_context' => true,
          'is_safe' => ['all'],
        ]
      ),
    ];
  }

public function generatePartial($env, $context) {
    // get arguments (minus env & $context)
    /** @var array{0:string, 1:array|string, 2:string} $args */
    $args = array_slice(func_get_args(), 2);
    $argsCount = count($args);

// default values
    $alias = null;

switch ($argsCount) {
      case 2:
        list($id, $file) = $args;
        break;
      case 3:
        list($id, $file, $alias) = $args;
        break;
      default:
        return;
    }

$renderedTemplate = CoreExtension::include($env, $context, $file);

$output = <<<EOL
<script id="$id" type="text/x-handlebars-template">
  $renderedTemplate
</script>
EOL;

if ($alias !== null) {
      $output .= <<<EOL
<script type="text/javascript">
jQuery(function($) {
  $(function() {
    Handlebars.registerPartial(
      '$alias',
      jQuery('#$id').html()
    );
  });
});
</script>
EOL;
    }
    return $output;
  }
}

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