lipsum.php
2c4192c0b5a9production

lipsum.php
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			#!/usr/bin/env php
			<?php

			$root = dirname(dirname(dirname(__FILE__)));
			require_once $root.'/scripts/__init_script__.php';

			$args = new PhutilArgumentParser($argv);
			$args->setTagline('test context-free grammars');
			$args->setSynopsis(<<<EOHELP
			lipsum.php __class__
			Generate output from a named context-free grammar.
			EOHELP
			);
			$args->parseStandardArguments();
			$args->parse(
			array(
			array(
			'name' => 'class',
			'wildcard' => true,
			),
			));

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

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

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

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