/**
  * Inject the lexer, if needed, and potentially set the 'disable strip whitespace' flag.
  *
  * @param array $config
  * @param Mustache $mustache
  * @param ContainerInterface $container
  */
 private function injectLexer(array $config, Mustache $mustache, ContainerInterface $container)
 {
     if (isset($config['lexer'])) {
         if (is_string($config['lexer']) && $container->has($config['lexer'])) {
             // Assume fully configured if pulled from container.
             $mustache->setLexer($container->get($config['lexer']));
             return;
         }
         if ($config['lexer'] instanceof Lexer) {
             $mustache->setLexer($config['lexer']);
         }
         if (is_string($config['lexer']) && class_exists($config['lexer'])) {
             $mustache->setLexer(new $config['lexer']());
         }
     }
     if (!array_key_exists('disable_strip_whitespace', $config)) {
         return;
     }
     $mustache->getLexer()->disableStripWhitespace((bool) $config['disable_strip_whitespace']);
 }