code: public function getSource($name)
      {
          if (!$this->exists($name)) {
              throw new Twig_Error_Loader(sprintf(
                  'Unable to find template "%s" from template map',
                  $name
              ));
          }
          if(!file_exists($this->map[$name])) {
              throw new Twig_Error_Loader(sprintf(
                  'Unable to open file "%s" from template map',
                  $this->map[$name]
              ));
          }
          return file_get_contents($this->map[$name]);
      }
docs: {@inheritDoc}