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Edit File: NameExpression.php

<?php
namespace MailPoetVendor\Twig\Node\Expression;
if (!defined('ABSPATH')) exit;
use MailPoetVendor\Twig\Compiler;
class NameExpression extends AbstractExpression
{
 private $specialVars = ['_self' => '$this->getTemplateName()', '_context' => '$context', '_charset' => '$this->env->getCharset()'];
 public function __construct(string $name, int $lineno)
 {
 parent::__construct([], ['name' => $name, 'is_defined_test' => \false, 'ignore_strict_check' => \false, 'always_defined' => \false], $lineno);
 }
 public function compile(Compiler $compiler) : void
 {
 $name = $this->getAttribute('name');
 $compiler->addDebugInfo($this);
 if ($this->getAttribute('is_defined_test')) {
 if (isset($this->specialVars[$name])) {
 $compiler->repr(\true);
 } elseif (\PHP_VERSION_ID >= 70400) {
 $compiler->raw('array_key_exists(')->string($name)->raw(', $context)');
 } else {
 $compiler->raw('(isset($context[')->string($name)->raw(']) || array_key_exists(')->string($name)->raw(', $context))');
 }
 } elseif (isset($this->specialVars[$name])) {
 $compiler->raw($this->specialVars[$name]);
 } elseif ($this->getAttribute('always_defined')) {
 $compiler->raw('$context[')->string($name)->raw(']');
 } else {
 if ($this->getAttribute('ignore_strict_check') || !$compiler->getEnvironment()->isStrictVariables()) {
 $compiler->raw('($context[')->string($name)->raw('] ?? null)');
 } else {
 $compiler->raw('(isset($context[')->string($name)->raw(']) || array_key_exists(')->string($name)->raw(', $context) ? $context[')->string($name)->raw('] : (function () { throw new RuntimeError(\'Variable ')->string($name)->raw(' does not exist.\', ')->repr($this->lineno)->raw(', $this->source); })()')->raw(')');
 }
 }
 }
 public function isSpecial()
 {
 trigger_deprecation('twig/twig', '3.11', 'The "%s()" method is deprecated and will be removed in Twig 4.0.', __METHOD__);
 return isset($this->specialVars[$this->getAttribute('name')]);
 }
 public function isSimple()
 {
 trigger_deprecation('twig/twig', '3.11', 'The "%s()" method is deprecated and will be removed in Twig 4.0.', __METHOD__);
 return !$this->isSpecial() && !$this->getAttribute('is_defined_test');
 }
}

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