public function compile(Compiler $compiler, TemplateFunction $function, array $arguments)
{
$callback = $function->getCallback();
//simple functions are compiled directly
if (is_string($callback)) {
$compiler->add($callback);
} else {
$compiler->add('$environment->getFunction(')->compileString($function->getFunctionName())->add(')->call');
}
$compiler->compileArgumentList($arguments);
}
