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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * (c) 2018 Douglas Reith.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * For the full copyright and license information, please view the LICENSE  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * file that was distributed with this source code.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                declare(strict_types=1);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Reith\ToyRobot\Console;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\Console\Command\Command;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\Console\Input\InputInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\Console\Output\OutputInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Symfony\Component\Console\Input\InputArgument;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Reith\ToyRobot\Messaging\Command\PlaceRobot;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                class Place extends Command  | 
            
            
                                                                        
                            
            
                                    
            
            
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                { | 
            
            
                                                                        
                            
            
                                    
            
            
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                    private const ARG = 'X,Y,F';  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    private const DEFAULT_INSTRUCTION = '0,0,E';  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    protected function configure()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $argMsg = 'The optional placement instructions. [X,Y] is the position. [F] is the direction, NESW';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ->setName('PLACE') | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ->setDescription('Place the robot on the table') | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ->addArgument(self::ARG, InputArgument::OPTIONAL, $argMsg)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ->setHelp(<<<EOT  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                The <info>robot:place</info> will set a robot on the table.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                <info>./toyrobot</info> <comment>PLACE X,Y,F</comment>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                <comment>[X,Y]</comment> is the coordinates of the starting position Robot, default is [0,0]  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                <comment>[F]</comment> is the direction the robot is facing, default is [E]ast  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                e.g.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    `./toyrobot PLACE`          to place a robot at [0,0] facing East.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    `./toyrobot PLACE 1,1`      to place a robot at [1,1] facing East.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    `./toyrobot PLACE 2,3,S`    to place a robot at [2,3] facing South.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                EOT  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    protected function execute(InputInterface $input, OutputInterface $output)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $instruction = $input->getArgument(self::ARG) ?: self::DEFAULT_INSTRUCTION;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $validInstructionRegEx = '/^[0-4],[0-4](,[NESW])?$/';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (1 !== preg_match($validInstructionRegEx, $instruction)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            throw new \RuntimeException(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                sprintf('Instruction [%s] is not valid', $instruction) | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $parts = explode(',', $instruction); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        [$x, $y] = $parts;  | 
            
                            
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                        $direction = 3 === count($parts) ? $parts[2] : 'E';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $output->writeln(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            sprintf('Using instruction [%d,%d,%s]', $x, $y, $direction) | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $message = new PlaceRobot([$x, $y], $direction);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->getHelper('bus')->postCommand($message); | 
            
                            
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                    }  | 
            
            
                                                        
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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This check marks access to variables or properties that have not been declared yet. While PHP has no explicit notion of declaring a variable, accessing it before a value is assigned to it is most likely a bug.