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<?php
/*
* This file is part of Psy Shell.
*
* (c) 2012-2022 Justin Hileman
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Psy\Command;
use PhpParser\NodeTraverser;
use PhpParser\PrettyPrinter\Standard as Printer;
use Psy\Command\TimeitCommand\TimeitVisitor;
use Psy\Input\CodeArgument;
use Psy\ParserFactory;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;
/**
* Class TimeitCommand.
*/
class TimeitCommand extends Command
{
const RESULT_MSG = '<info>Command took %.6f seconds to complete.</info>';
const AVG_RESULT_MSG = '<info>Command took %.6f seconds on average (%.6f median; %.6f total) to complete.</info>';
private static $start = null;
private static $times = [];
private $parser;
private $traverser;
private $printer;
/**
* {@inheritdoc}
*/
public function __construct($name = null)
{
$parserFactory = new ParserFactory();
$this->parser = $parserFactory->createParser();
$this->traverser = new NodeTraverser();
$this->traverser->addVisitor(new TimeitVisitor());
$this->printer = new Printer();
parent::__construct($name);
}
/**
* {@inheritdoc}
*/
protected function configure()
{
$this
->setName('timeit')
->setDefinition([
new InputOption('num', 'n', InputOption::VALUE_REQUIRED, 'Number of iterations.'),
new CodeArgument('code', CodeArgument::REQUIRED, 'Code to execute.'),
])
->setDescription('Profiles with a timer.')
->setHelp(
<<<'HELP'
Time profiling for functions and commands.
e.g.
<return>>>> timeit sleep(1)</return>
<return>>>> timeit -n1000 $closure()</return>
HELP
);
}
/**
* {@inheritdoc}
*
* @return int 0 if everything went fine, or an exit code
*/
protected function execute(InputInterface $input, OutputInterface $output)
{
$code = $input->getArgument('code');
$num = $input->getOption('num') ?: 1;
$shell = $this->getApplication();
$instrumentedCode = $this->instrumentCode($code);
self::$times = [];
for ($i = 0; $i < $num; $i++) {
$_ = $shell->execute($instrumentedCode);
$this->ensureEndMarked();
}
$shell->writeReturnValue($_);
$times = self::$times;
self::$times = [];
if ($num === 1) {
$output->writeln(\sprintf(self::RESULT_MSG, $times[0]));
} else {
$total = \array_sum($times);
\rsort($times);
$median = $times[\round($num / 2)];
$output->writeln(\sprintf(self::AVG_RESULT_MSG, $total / $num, $median, $total));
}
return 0;
}
/**
* Internal method for marking the start of timeit execution.
*
* A static call to this method will be injected at the start of the timeit
* input code to instrument the call. We will use the saved start time to
* more accurately calculate time elapsed during execution.
*/
public static function markStart()
{
self::$start = \microtime(true);
}
/**
* Internal method for marking the end of timeit execution.
*
* A static call to this method is injected by TimeitVisitor at the end
* of the timeit input code to instrument the call.
*
* Note that this accepts an optional $ret parameter, which is used to pass
* the return value of the last statement back out of timeit. This saves us
* a bunch of code rewriting shenanigans.
*
* @param mixed $ret
*
* @return mixed it just passes $ret right back
*/
public static function markEnd($ret = null)
{
self::$times[] = \microtime(true) - self::$start;
self::$start = null;
return $ret;
}
/**
* Ensure that the end of code execution was marked.
*
* The end *should* be marked in the instrumented code, but just in case
* we'll add a fallback here.
*/
private function ensureEndMarked()
{
if (self::$start !== null) {
self::markEnd();
}
}
/**
* Instrument code for timeit execution.
*
* This inserts `markStart` and `markEnd` calls to ensure that (reasonably)
* accurate times are recorded for just the code being executed.
*
* @param string $code
*
* @return string
*/
private function instrumentCode(string $code): string
{
return $this->printer->prettyPrint($this->traverser->traverse($this->parse($code)));
}
/**
* Lex and parse a string of code into statements.
*
* @param string $code
*
* @return array Statements
*/
private function parse(string $code): array
{
$code = '<?php '.$code;
try {
return $this->parser->parse($code);
} catch (\PhpParser\Error $e) {
if (\strpos($e->getMessage(), 'unexpected EOF') === false) {
throw $e;
}
// If we got an unexpected EOF, let's try it again with a semicolon.
return $this->parser->parse($code.';');
}
}
}
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