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<?php namespace Illuminate\Foundation\Console;

use Boris\Boris;
use Illuminate\Console\Command;

class TinkerCommand extends Command {

/**
	 * The console command name.
	 *
	 * @var string
	 */
	protected $name = 'tinker';

/**
	 * The console command description.
	 *
	 * @var string
	 */
	protected $description = "Interact with your application";

/**
	 * Execute the console command.
	 *
	 * @return void
	 */
	public function fire()
	{
		if ($this->supportsBoris())
		{
			$this->runBorisShell();
		}
		else
		{
			$this->comment('Full REPL not supported. Falling back to simple shell.');

$this->runPlainShell();
		}
	}

/**
	 * Run the Boris REPL with the current context.
	 *
	 * @return void
	 */
	protected function runBorisShell()
	{
		$this->setupBorisErrorHandling();

(new Boris('> '))->start();
	}

/**
	 * Setup the Boris exception handling.
	 *
	 * @return void
	 */
	protected function setupBorisErrorHandling()
	{
		restore_error_handler(); restore_exception_handler();

$this->laravel->make('artisan')->setCatchExceptions(false);

$this->laravel->error(function() { return ''; });
	}

/**
	 * Run the plain Artisan tinker shell.
	 *
	 * @return void
	 */
	protected function runPlainShell()
	{
		$input = $this->prompt();

while ($input != 'quit')
		{
			// We will wrap the execution of the command in a try / catch block so we
			// can easily display the errors in a convenient way instead of having
			// them bubble back out to the CLI and stop the entire command loop.
			try
			{
				if (starts_with($input, 'dump '))
				{
					$input = 'var_dump('.substr($input, 5).');';
				}

eval($input);
			}

// If an exception occurs, we will just display the message and keep this
			// loop going so we can keep executing commands. However, when a fatal
			// error occurs, we have no choice but to bail out of this routines.
			catch (\Exception $e)
			{
				$this->error($e->getMessage());
			}

$input = $this->prompt();
		}
	}

/**
	 * Prompt the developer for a command.
	 *
	 * @return string
	 */
	protected function prompt()
	{
		$dialog = $this->getHelperSet()->get('dialog');

return $dialog->ask($this->output, "<info>></info>", null);
	}

/**
	 * Determine if the current environment supports Boris.
	 *
	 * @return bool
	 */
	protected function supportsBoris()
	{
		return extension_loaded('readline') && extension_loaded('posix') && extension_loaded('pcntl');
	}

}

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