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Show All 19 Lines	$args->parse(
));		));

$class = $args->getArg('class');		$class = $args->getArg('class');
if (count($class) !== 1) {		if (count($class) !== 1) {
$args->printHelpAndExit();		$args->printHelpAndExit();
}		}
$class = reset($class);		$class = reset($class);

$symbols = id(new PhutilSymbolLoader())		$symbols = id(new PhutilClassMapQuery())
->setAncestorClass('PhutilContextFreeGrammar')		->setAncestorClass('PhutilContextFreeGrammar')
->setConcreteOnly(true)		->execute();
->selectAndLoadSymbols();
$symbols = ipull($symbols, 'name', 'name');		$symbols = ipull($symbols, 'name', 'name');

if (empty($symbols[$class])) {		if (empty($symbols[$class])) {
$available = implode(', ', array_keys($symbols));		$available = implode(', ', array_keys($symbols));
throw new PhutilArgumentUsageException(		throw new PhutilArgumentUsageException(
pht(		pht(
"Class '%s' is not a defined, concrete subclass of %s. ".		"Class '%s' is not a defined, concrete subclass of %s. ".
"Available classes are: %s",		"Available classes are: %s",
$class,		$class,
'PhutilContextFreeGrammar',		'PhutilContextFreeGrammar',
$available));		$available));
}		}

$object = newv($class, array());		$object = newv($class, array());
echo $object->generate()."\n";		echo $object->generate()."\n";