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<?php |
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namespace Sebdesign\SM\Commands; |
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use Illuminate\Console\Command; |
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use Symfony\Component\Process\Exception\ProcessFailedException; |
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use Symfony\Component\Process\Process; |
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class Visualize extends Command |
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{ |
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/** |
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* The name and signature of the console command. |
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* |
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* @var string |
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*/ |
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protected $signature = 'winzou:state-machine:visualize |
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{graph? : A state machine graph} |
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{--output=./graph.jpg} |
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{--format=jpg} |
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{--direction=TB} |
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{--shape=circle} |
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{--dot-path=}'; |
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/** |
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* The console command description. |
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* |
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* @var string |
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*/ |
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protected $description = 'Generates an image of the states and transitions of state machine graphs'; |
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protected $config; |
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/** |
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* Create a new command instance. |
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* |
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* @param array $config |
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*/ |
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public function __construct(array $config) |
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{ |
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parent::__construct(); |
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$this->config = $config; |
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} |
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/** |
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* Execute the console command. |
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* |
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* @return mixed |
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*/ |
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public function handle() |
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{ |
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if (empty($this->config)) { |
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$this->error('There are no state machines configured.'); |
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return 1; |
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} |
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if (! $this->argument('graph')) { |
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$this->askForGraph(); |
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} |
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$graph = $this->argument('graph'); |
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if (! array_key_exists($graph, $this->config)) { |
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$this->error('The provided state machine graph is not configured.'); |
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return 1; |
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} |
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$config = $this->config[$graph]; |
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$this->stateMachineInDotFormat($config); |
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return 0; |
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} |
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/** |
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* Ask for a graph name if one was not provided as argument. |
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*/ |
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protected function askForGraph() |
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{ |
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$choices = array_map(function ($name, $config) { |
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return $name."\t(".$config['class'].' - '.$config['graph'].')'; |
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}, array_keys($this->config), $this->config); |
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$choice = $this->choice('Which state machine would you like to know about?', $choices, 0); |
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$choice = substr($choice, 0, strpos($choice, "\t")); |
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$this->info('You have just selected: '.$choice); |
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$this->input->setArgument('graph', $choice); |
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} |
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protected function stateMachineInDotFormat(array $config) |
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{ |
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// Output image mime types. |
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$mimeTypes = [ |
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'png' => 'image/png', |
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'jpg' => 'image/jpeg', |
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'gif' => 'image/gif', |
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'svg' => 'image/svg+xml', |
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]; |
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$format = $this->option('format'); |
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if (empty($mimeTypes[$format])) { |
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throw new \Exception(sprintf("Format '%s' is not supported", $format)); |
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} |
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$dotPath = $this->option('dot-path') ?? 'dot'; |
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$outputImage = $this->option('output'); |
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$process = new Process([$dotPath, '-T', $format, '-o', $outputImage]); |
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$process->setInput($this->buildDotFile($config)); |
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$process->run(); |
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// executes after the command finishes |
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if (! $process->isSuccessful()) { |
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throw new ProcessFailedException($process); |
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} |
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} |
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protected function buildDotFile(array $config): string |
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{ |
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// Display settings |
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$layout = $this->option('direction') === 'TB' ? 'TB' : 'LR'; |
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$nodeShape = $this->option('shape'); |
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// Build dot file content. |
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$result = []; |
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$result[] = 'digraph finite_state_machine {'; |
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$result[] = "rankdir={$layout};"; |
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$result[] = 'node [shape = point]; _start_'; // Input node |
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// Use first value from 'states' as start. |
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if (is_array($config['states'][0])) { |
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$start = $config['states'][0]['name'] ?? 'null'; |
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} else { |
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$start = $config['states'][0] ?? 'null'; |
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} |
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$result[] = "node [shape = {$nodeShape}];"; // Default nodes |
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$result[] = "_start_ -> \"{$start}\";"; // Input node -> starting node. |
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foreach ($config['transitions'] as $name => $transition) { |
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foreach ($transition['from'] as $from) { |
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$result[] = "\"{$from}\" -> \"{$transition['to']}\" [label = \"{$name}\"];"; |
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} |
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} |
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$result[] = '}'; |
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return implode(PHP_EOL, $result); |
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} |
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} |
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sebdesign /
laravel-state-machine
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