Chris@0: <?php
Chris@0: 
Chris@0: /*
Chris@0:  * This file is part of Psy Shell.
Chris@0:  *
Chris@0:  * (c) 2012-2018 Justin Hileman
Chris@0:  *
Chris@0:  * For the full copyright and license information, please view the LICENSE
Chris@0:  * file that was distributed with this source code.
Chris@0:  */
Chris@0: 
Chris@0: namespace Psy\Command;
Chris@0: 
Chris@0: use JakubOnderka\PhpConsoleHighlighter\Highlighter;
Chris@0: use Psy\Configuration;
Chris@0: use Psy\ConsoleColorFactory;
Chris@0: use Psy\Exception\RuntimeException;
Chris@0: use Psy\Formatter\CodeFormatter;
Chris@0: use Psy\Formatter\SignatureFormatter;
Chris@0: use Psy\Input\CodeArgument;
Chris@0: use Psy\Output\ShellOutput;
Chris@0: use Symfony\Component\Console\Formatter\OutputFormatter;
Chris@0: use Symfony\Component\Console\Input\InputInterface;
Chris@0: use Symfony\Component\Console\Input\InputOption;
Chris@0: use Symfony\Component\Console\Output\OutputInterface;
Chris@0: 
Chris@0: /**
Chris@0:  * Show the code for an object, class, constant, method or property.
Chris@0:  */
Chris@0: class ShowCommand extends ReflectingCommand
Chris@0: {
Chris@0:     private $colorMode;
Chris@0:     private $highlighter;
Chris@0:     private $lastException;
Chris@0:     private $lastExceptionIndex;
Chris@0: 
Chris@0:     /**
Chris@0:      * @param null|string $colorMode (default: null)
Chris@0:      */
Chris@0:     public function __construct($colorMode = null)
Chris@0:     {
Chris@0:         $this->colorMode = $colorMode ?: Configuration::COLOR_MODE_AUTO;
Chris@0: 
Chris@0:         parent::__construct();
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * {@inheritdoc}
Chris@0:      */
Chris@0:     protected function configure()
Chris@0:     {
Chris@0:         $this
Chris@0:             ->setName('show')
Chris@0:             ->setDefinition([
Chris@0:                 new CodeArgument('target', CodeArgument::OPTIONAL, 'Function, class, instance, constant, method or property to show.'),
Chris@0:                 new InputOption('ex', null,  InputOption::VALUE_OPTIONAL, 'Show last exception context. Optionally specify a stack index.', 1),
Chris@0:             ])
Chris@0:             ->setDescription('Show the code for an object, class, constant, method or property.')
Chris@0:             ->setHelp(
Chris@0:                 <<<HELP
Chris@0: Show the code for an object, class, constant, method or property, or the context
Chris@0: of the last exception.
Chris@0: 
Chris@0: <return>cat --ex</return> defaults to showing the lines surrounding the location of the last
Chris@0: exception. Invoking it more than once travels up the exception's stack trace,
Chris@0: and providing a number shows the context of the given index of the trace.
Chris@0: 
Chris@0: e.g.
Chris@0: <return>>>> show \$myObject</return>
Chris@0: <return>>>> show Psy\Shell::debug</return>
Chris@0: <return>>>> show --ex</return>
Chris@0: <return>>>> show --ex 3</return>
Chris@0: HELP
Chris@0:             );
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * {@inheritdoc}
Chris@0:      */
Chris@0:     protected function execute(InputInterface $input, OutputInterface $output)
Chris@0:     {
Chris@0:         // n.b. As far as I can tell, InputInterface doesn't want to tell me
Chris@0:         // whether an option with an optional value was actually passed. If you
Chris@0:         // call `$input->getOption('ex')`, it will return the default, both when
Chris@0:         // `--ex` is specified with no value, and when `--ex` isn't specified at
Chris@0:         // all.
Chris@0:         //
Chris@0:         // So we're doing something sneaky here. If we call `getOptions`, it'll
Chris@0:         // return the default value when `--ex` is not present, and `null` if
Chris@0:         // `--ex` is passed with no value. /shrug
Chris@0:         $opts = $input->getOptions();
Chris@0: 
Chris@0:         // Strict comparison to `1` (the default value) here, because `--ex 1`
Chris@0:         // will come in as `"1"`. Now we can tell the difference between
Chris@0:         // "no --ex present", because it's the integer 1, "--ex with no value",
Chris@0:         // because it's `null`, and "--ex 1", because it's the string "1".
Chris@0:         if ($opts['ex'] !== 1) {
Chris@0:             if ($input->getArgument('target')) {
Chris@0:                 throw new \InvalidArgumentException('Too many arguments (supply either "target" or "--ex")');
Chris@0:             }
Chris@0: 
Chris@0:             return $this->writeExceptionContext($input, $output);
Chris@0:         }
Chris@0: 
Chris@0:         if ($input->getArgument('target')) {
Chris@0:             return $this->writeCodeContext($input, $output);
Chris@0:         }
Chris@0: 
Chris@0:         throw new RuntimeException('Not enough arguments (missing: "target")');
Chris@0:     }
Chris@0: 
Chris@0:     private function writeCodeContext(InputInterface $input, OutputInterface $output)
Chris@0:     {
Chris@0:         list($target, $reflector) = $this->getTargetAndReflector($input->getArgument('target'));
Chris@0: 
Chris@0:         // Set some magic local variables
Chris@0:         $this->setCommandScopeVariables($reflector);
Chris@0: 
Chris@0:         try {
Chris@0:             $output->page(CodeFormatter::format($reflector, $this->colorMode), ShellOutput::OUTPUT_RAW);
Chris@0:         } catch (RuntimeException $e) {
Chris@0:             $output->writeln(SignatureFormatter::format($reflector));
Chris@0:             throw $e;
Chris@0:         }
Chris@0:     }
Chris@0: 
Chris@0:     private function writeExceptionContext(InputInterface $input, OutputInterface $output)
Chris@0:     {
Chris@0:         $exception = $this->context->getLastException();
Chris@0:         if ($exception !== $this->lastException) {
Chris@0:             $this->lastException = null;
Chris@0:             $this->lastExceptionIndex = null;
Chris@0:         }
Chris@0: 
Chris@0:         $opts = $input->getOptions();
Chris@0:         if ($opts['ex'] === null) {
Chris@0:             if ($this->lastException && $this->lastExceptionIndex !== null) {
Chris@0:                 $index = $this->lastExceptionIndex + 1;
Chris@0:             } else {
Chris@0:                 $index = 0;
Chris@0:             }
Chris@0:         } else {
Chris@4:             $index = \max(0, \intval($input->getOption('ex')) - 1);
Chris@0:         }
Chris@0: 
Chris@0:         $trace = $exception->getTrace();
Chris@4:         \array_unshift($trace, [
Chris@0:             'file' => $exception->getFile(),
Chris@0:             'line' => $exception->getLine(),
Chris@0:         ]);
Chris@0: 
Chris@4:         if ($index >= \count($trace)) {
Chris@0:             $index = 0;
Chris@0:         }
Chris@0: 
Chris@0:         $this->lastException = $exception;
Chris@0:         $this->lastExceptionIndex = $index;
Chris@0: 
Chris@0:         $output->writeln($this->getApplication()->formatException($exception));
Chris@0:         $output->writeln('--');
Chris@0:         $this->writeTraceLine($output, $trace, $index);
Chris@0:         $this->writeTraceCodeSnippet($output, $trace, $index);
Chris@0: 
Chris@0:         $this->setCommandScopeVariablesFromContext($trace[$index]);
Chris@0:     }
Chris@0: 
Chris@0:     private function writeTraceLine(OutputInterface $output, array $trace, $index)
Chris@0:     {
Chris@0:         $file = isset($trace[$index]['file']) ? $this->replaceCwd($trace[$index]['file']) : 'n/a';
Chris@0:         $line = isset($trace[$index]['line']) ? $trace[$index]['line'] : 'n/a';
Chris@0: 
Chris@4:         $output->writeln(\sprintf(
Chris@0:             'From <info>%s:%d</info> at <strong>level %d</strong> of backtrace (of %d).',
Chris@0:             OutputFormatter::escape($file),
Chris@0:             OutputFormatter::escape($line),
Chris@0:             $index + 1,
Chris@4:             \count($trace)
Chris@0:         ));
Chris@0:     }
Chris@0: 
Chris@0:     private function replaceCwd($file)
Chris@0:     {
Chris@4:         if ($cwd = \getcwd()) {
Chris@4:             $cwd = \rtrim($cwd, DIRECTORY_SEPARATOR) . DIRECTORY_SEPARATOR;
Chris@0:         }
Chris@0: 
Chris@0:         if ($cwd === false) {
Chris@0:             return $file;
Chris@0:         } else {
Chris@4:             return \preg_replace('/^' . \preg_quote($cwd, '/') . '/', '', $file);
Chris@0:         }
Chris@0:     }
Chris@0: 
Chris@0:     private function writeTraceCodeSnippet(OutputInterface $output, array $trace, $index)
Chris@0:     {
Chris@0:         if (!isset($trace[$index]['file'])) {
Chris@0:             return;
Chris@0:         }
Chris@0: 
Chris@0:         $file = $trace[$index]['file'];
Chris@0:         if ($fileAndLine = $this->extractEvalFileAndLine($file)) {
Chris@0:             list($file, $line) = $fileAndLine;
Chris@0:         } else {
Chris@0:             if (!isset($trace[$index]['line'])) {
Chris@0:                 return;
Chris@0:             }
Chris@0: 
Chris@0:             $line = $trace[$index]['line'];
Chris@0:         }
Chris@0: 
Chris@4:         if (\is_file($file)) {
Chris@4:             $code = @\file_get_contents($file);
Chris@0:         }
Chris@0: 
Chris@0:         if (empty($code)) {
Chris@0:             return;
Chris@0:         }
Chris@0: 
Chris@0:         $output->write($this->getHighlighter()->getCodeSnippet($code, $line, 5, 5), ShellOutput::OUTPUT_RAW);
Chris@0:     }
Chris@0: 
Chris@0:     private function getHighlighter()
Chris@0:     {
Chris@0:         if (!$this->highlighter) {
Chris@0:             $factory = new ConsoleColorFactory($this->colorMode);
Chris@0:             $this->highlighter = new Highlighter($factory->getConsoleColor());
Chris@0:         }
Chris@0: 
Chris@0:         return $this->highlighter;
Chris@0:     }
Chris@0: 
Chris@0:     private function setCommandScopeVariablesFromContext(array $context)
Chris@0:     {
Chris@0:         $vars = [];
Chris@0: 
Chris@0:         if (isset($context['class'])) {
Chris@0:             $vars['__class'] = $context['class'];
Chris@0:             if (isset($context['function'])) {
Chris@0:                 $vars['__method'] = $context['function'];
Chris@0:             }
Chris@0: 
Chris@0:             try {
Chris@0:                 $refl = new \ReflectionClass($context['class']);
Chris@0:                 if ($namespace = $refl->getNamespaceName()) {
Chris@0:                     $vars['__namespace'] = $namespace;
Chris@0:                 }
Chris@0:             } catch (\Exception $e) {
Chris@0:                 // oh well
Chris@0:             }
Chris@0:         } elseif (isset($context['function'])) {
Chris@0:             $vars['__function'] = $context['function'];
Chris@0: 
Chris@0:             try {
Chris@0:                 $refl = new \ReflectionFunction($context['function']);
Chris@0:                 if ($namespace = $refl->getNamespaceName()) {
Chris@0:                     $vars['__namespace'] = $namespace;
Chris@0:                 }
Chris@0:             } catch (\Exception $e) {
Chris@0:                 // oh well
Chris@0:             }
Chris@0:         }
Chris@0: 
Chris@0:         if (isset($context['file'])) {
Chris@0:             $file = $context['file'];
Chris@0:             if ($fileAndLine = $this->extractEvalFileAndLine($file)) {
Chris@0:                 list($file, $line) = $fileAndLine;
Chris@0:             } elseif (isset($context['line'])) {
Chris@0:                 $line = $context['line'];
Chris@0:             }
Chris@0: 
Chris@4:             if (\is_file($file)) {
Chris@0:                 $vars['__file'] = $file;
Chris@0:                 if (isset($line)) {
Chris@0:                     $vars['__line'] = $line;
Chris@0:                 }
Chris@4:                 $vars['__dir'] = \dirname($file);
Chris@0:             }
Chris@0:         }
Chris@0: 
Chris@0:         $this->context->setCommandScopeVariables($vars);
Chris@0:     }
Chris@0: 
Chris@0:     private function extractEvalFileAndLine($file)
Chris@0:     {
Chris@4:         if (\preg_match('/(.*)\\((\\d+)\\) : eval\\(\\)\'d code$/', $file, $matches)) {
Chris@0:             return [$matches[1], $matches[2]];
Chris@0:         }
Chris@0:     }
Chris@0: }