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<?php |
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/** |
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* MIT License |
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* For full license information, please view the LICENSE file that was distributed with this source code. |
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*/ |
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namespace Phinx\Console\Command; |
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use Exception; |
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use InvalidArgumentException; |
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use Phinx\Config\NamespaceAwareInterface; |
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use Phinx\Util\Util; |
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use RuntimeException; |
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use Symfony\Component\Console\Input\InputArgument; |
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use Symfony\Component\Console\Input\InputInterface; |
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use Symfony\Component\Console\Input\InputOption; |
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use Symfony\Component\Console\Output\OutputInterface; |
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use Symfony\Component\Console\Question\ChoiceQuestion; |
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use Symfony\Component\Console\Question\ConfirmationQuestion; |
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class Create extends AbstractCommand |
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{ |
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/** |
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* @var string |
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*/ |
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protected static $defaultName = 'create'; |
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/** |
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* The name of the interface that any external template creation class is required to implement. |
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*/ |
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public const CREATION_INTERFACE = 'Phinx\Migration\CreationInterface'; |
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/** |
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* {@inheritDoc} |
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* |
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* @return void |
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*/ |
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protected function configure() |
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{ |
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parent::configure(); |
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$this->setDescription('Create a new migration') |
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->addArgument('name', InputArgument::OPTIONAL, 'Class name of the migration (in CamelCase)') |
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->setHelp(sprintf( |
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'%sCreates a new database migration%s', |
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PHP_EOL, |
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PHP_EOL |
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)); |
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// An alternative template. |
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$this->addOption('template', 't', InputOption::VALUE_REQUIRED, 'Use an alternative template'); |
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// A classname to be used to gain access to the template content as well as the ability to |
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// have a callback once the migration file has been created. |
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$this->addOption('class', 'l', InputOption::VALUE_REQUIRED, 'Use a class implementing "' . self::CREATION_INTERFACE . '" to generate the template'); |
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// Allow the migration path to be chosen non-interactively. |
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$this->addOption('path', null, InputOption::VALUE_REQUIRED, 'Specify the path in which to create this migration'); |
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} |
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/** |
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* Get the confirmation question asking if the user wants to create the |
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* migrations directory. |
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* |
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* @return \Symfony\Component\Console\Question\ConfirmationQuestion |
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*/ |
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protected function getCreateMigrationDirectoryQuestion() |
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{ |
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return new ConfirmationQuestion('Create migrations directory? [y]/n ', true); |
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} |
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/** |
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* Get the question that allows the user to select which migration path to use. |
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* |
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* @param string[] $paths Paths |
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* |
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* @return \Symfony\Component\Console\Question\ChoiceQuestion |
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*/ |
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protected function getSelectMigrationPathQuestion(array $paths) |
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{ |
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return new ChoiceQuestion('Which migrations path would you like to use?', $paths, 0); |
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} |
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/** |
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* Returns the migration path to create the migration in. |
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* |
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* @param \Symfony\Component\Console\Input\InputInterface $input Input |
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* @param \Symfony\Component\Console\Output\OutputInterface $output Output |
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* |
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* @throws \Exception |
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* |
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* @return string |
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*/ |
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protected function getMigrationPath(InputInterface $input, OutputInterface $output) |
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{ |
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// First, try the non-interactive option: |
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$path = $input->getOption('path'); |
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if (!empty($path)) { |
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return $path; |
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} |
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$paths = $this->getConfig()->getMigrationPaths(); |
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// No paths? That's a problem. |
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if (empty($paths)) { |
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throw new Exception('No migration paths set in your Phinx configuration file.'); |
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} |
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$paths = Util::globAll($paths); |
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if (empty($paths)) { |
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throw new Exception( |
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'You probably used curly braces to define migration path in your Phinx configuration file, ' . |
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'but no directories have been matched using this pattern. ' . |
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'You need to create a migration directory manually.' |
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); |
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} |
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// Only one path set, so select that: |
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if (count($paths) === 1) { |
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return array_shift($paths); |
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} |
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/** @var \Symfony\Component\Console\Helper\QuestionHelper $helper */ |
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$helper = $this->getHelper('question'); |
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$question = $this->getSelectMigrationPathQuestion($paths); |
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return $helper->ask($input, $output, $question); |
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} |
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/** |
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* Create the new migration. |
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* |
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* @param \Symfony\Component\Console\Input\InputInterface $input Input |
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* @param \Symfony\Component\Console\Output\OutputInterface $output Output |
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* |
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* @throws \RuntimeException |
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* @throws \InvalidArgumentException |
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* |
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* @return int 0 on success |
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*/ |
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protected function execute(InputInterface $input, OutputInterface $output) |
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{ |
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$this->bootstrap($input, $output); |
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// get the migration path from the config |
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$path = $this->getMigrationPath($input, $output); |
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if (!file_exists($path)) { |
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/** @var \Symfony\Component\Console\Helper\QuestionHelper $helper */ |
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$helper = $this->getHelper('question'); |
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$question = $this->getCreateMigrationDirectoryQuestion(); |
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if ($helper->ask($input, $output, $question)) { |
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mkdir($path, 0755, true); |
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} |
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} |
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$this->verifyMigrationDirectory($path); |
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$config = $this->getConfig(); |
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$namespace = $config instanceof NamespaceAwareInterface ? $config->getMigrationNamespaceByPath($path) : null; |
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$path = realpath($path); |
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$className = $input->getArgument('name'); |
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if ($className === null) { |
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$currentTimestamp = Util::getCurrentTimestamp(); |
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$className = "V" . $currentTimestamp; |
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$fileName = $currentTimestamp . '.php'; |
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} else { |
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if (!Util::isValidPhinxClassName($className)) { |
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throw new InvalidArgumentException(sprintf( |
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'The migration class name "%s" is invalid. Please use CamelCase format.', |
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$className |
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)); |
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} |
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// Compute the file path |
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$fileName = Util::mapClassNameToFileName($className); |
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} |
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if (!Util::isUniqueMigrationClassName($className, $path)) { |
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throw new InvalidArgumentException(sprintf( |
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'The migration class name "%s%s" already exists', |
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$namespace ? ($namespace . '\\') : '', |
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$className |
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)); |
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} |
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$filePath = $path . DIRECTORY_SEPARATOR . $fileName; |
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if (is_file($filePath)) { |
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throw new InvalidArgumentException(sprintf( |
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'The file "%s" already exists', |
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$filePath |
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)); |
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} |
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// Get the alternative template and static class options from the config, but only allow one of them. |
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$defaultAltTemplate = $this->getConfig()->getTemplateFile(); |
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$defaultCreationClassName = $this->getConfig()->getTemplateClass(); |
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if ($defaultAltTemplate && $defaultCreationClassName) { |
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throw new InvalidArgumentException('Cannot define template:class and template:file at the same time'); |
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} |
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// Get the alternative template and static class options from the command line, but only allow one of them. |
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$altTemplate = $input->getOption('template'); |
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$creationClassName = $input->getOption('class'); |
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if ($altTemplate && $creationClassName) { |
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throw new InvalidArgumentException('Cannot use --template and --class at the same time'); |
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} |
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// If no commandline options then use the defaults. |
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if (!$altTemplate && !$creationClassName) { |
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$altTemplate = $defaultAltTemplate; |
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$creationClassName = $defaultCreationClassName; |
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} |
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// Verify the alternative template file's existence. |
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if ($altTemplate && !is_file($altTemplate)) { |
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throw new InvalidArgumentException(sprintf( |
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'The alternative template file "%s" does not exist', |
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$altTemplate |
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)); |
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} |
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// Verify that the template creation class (or the aliased class) exists and that it implements the required interface. |
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$aliasedClassName = null; |
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if ($creationClassName) { |
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// Supplied class does not exist, is it aliased? |
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if (!class_exists($creationClassName)) { |
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$aliasedClassName = $this->getConfig()->getAlias($creationClassName); |
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if ($aliasedClassName && !class_exists($aliasedClassName)) { |
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throw new InvalidArgumentException(sprintf( |
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'The class "%s" via the alias "%s" does not exist', |
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$aliasedClassName, |
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$creationClassName |
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)); |
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} elseif (!$aliasedClassName) { |
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throw new InvalidArgumentException(sprintf( |
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'The class "%s" does not exist', |
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$creationClassName |
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)); |
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} |
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} |
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// Does the class implement the required interface? |
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if (!$aliasedClassName && !is_subclass_of($creationClassName, self::CREATION_INTERFACE)) { |
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throw new InvalidArgumentException(sprintf( |
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'The class "%s" does not implement the required interface "%s"', |
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$creationClassName, |
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self::CREATION_INTERFACE |
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)); |
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} elseif ($aliasedClassName && !is_subclass_of($aliasedClassName, self::CREATION_INTERFACE)) { |
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throw new InvalidArgumentException(sprintf( |
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'The class "%s" via the alias "%s" does not implement the required interface "%s"', |
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$aliasedClassName, |
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$creationClassName, |
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self::CREATION_INTERFACE |
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)); |
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} |
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} |
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// Use the aliased class. |
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$creationClassName = $aliasedClassName ?: $creationClassName; |
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// Determine the appropriate mechanism to get the template |
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if ($creationClassName) { |
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// Get the template from the creation class |
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$creationClass = new $creationClassName($input, $output); |
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$contents = $creationClass->getMigrationTemplate(); |
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} else { |
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// Load the alternative template if it is defined. |
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$contents = file_get_contents($altTemplate ?: $this->getMigrationTemplateFilename()); |
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} |
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// inject the class names appropriate to this migration |
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$classes = [ |
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'$namespaceDefinition' => $namespace !== null ? (PHP_EOL . 'namespace ' . $namespace . ';' . PHP_EOL) : '', |
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'$namespace' => $namespace, |
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'$useClassName' => $this->getConfig()->getMigrationBaseClassName(false), |
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'$className' => $className, |
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'$version' => Util::getVersionFromFileName($fileName), |
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'$baseClassName' => $this->getConfig()->getMigrationBaseClassName(true), |
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]; |
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$contents = strtr($contents, $classes); |
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if (file_put_contents($filePath, $contents) === false) { |
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throw new RuntimeException(sprintf( |
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'The file "%s" could not be written to', |
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$path |
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)); |
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} |
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// Do we need to do the post creation call to the creation class? |
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if (isset($creationClass)) { |
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/** @var \Phinx\Migration\CreationInterface $creationClass */ |
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$creationClass->postMigrationCreation($filePath, $className, $this->getConfig()->getMigrationBaseClassName()); |
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} |
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$output->writeln('<info>using migration base class</info> ' . $classes['$useClassName']); |
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if (!empty($altTemplate)) { |
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$output->writeln('<info>using alternative template</info> ' . $altTemplate); |
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} elseif (!empty($creationClassName)) { |
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$output->writeln('<info>using template creation class</info> ' . $creationClassName); |
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} else { |
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$output->writeln('<info>using default template</info>'); |
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} |
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$output->writeln('<info>created</info> ' . str_replace(getcwd() . DIRECTORY_SEPARATOR, '', $filePath)); |
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return self::CODE_SUCCESS; |
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} |
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} |
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If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design.
Let’s take a look at an example:
Our function
my_function
expects aPost
object, and outputs the author of the post. The base classPost
returns a simple string and outputting a simple string will work just fine. However, the child classBlogPost
which is a sub-type ofPost
instead decided to return anobject
, and is therefore violating the SOLID principles. If aBlogPost
were passed tomy_function
, PHP would not complain, but ultimately fail when executing thestrtoupper
call in its body.