/** * Returns a generator selected by the user from a multilevel console menu. */ protected function selectGenerator(InputInterface $input, OutputInterface $output) { // Narrow menu tree according to the active menu items. $active_menu_tree = $this->menuTree; foreach ($this->activeMenuItems as $active_menu_item) { $active_menu_tree = $active_menu_tree[$active_menu_item]; } // The $active_menu_tree can be either an array of child menu items or // the TRUE value indicating that the user reached the final menu point and // active menu items contain the actual command name. if (is_array($active_menu_tree)) { $subtrees = $command_names = []; // We build $choices as an associative array to be able to find // later menu items by respective labels. foreach ($active_menu_tree as $menu_item => $subtree) { $menu_item_label = $this->createMenuItemLabel($menu_item, is_array($subtree)); if (is_array($subtree)) { $subtrees[$menu_item] = $menu_item_label; } else { $command_names[$menu_item] = $menu_item_label; } } asort($subtrees); asort($command_names); // Generally the choices array consists of the following parts: // - Reference to the parent menu level. // - Sorted list of nested menu levels. // - Sorted list of commands. $choices = ['..' => '..'] + $subtrees + $command_names; $question = new ChoiceQuestion('<title>Select generator:</title>', array_values($choices)); $question->setPrompt(' >>> '); $answer_label = $this->getHelper('question')->ask($input, $output, $question); $answer = array_search($answer_label, $choices); if (!$answer) { throw new \UnexpectedValueException(sprintf('"%s" menu item was not found', $answer_label)); } if ($answer == '..') { // Exit the application if the user choices zero key // on the top menu level. if (count($this->activeMenuItems) == 0) { return NULL; } // Set the menu one level higher. array_pop($this->activeMenuItems); } else { // Set the menu one level deeper. $this->activeMenuItems[] = $answer; } return $this->selectGenerator($input, $output); } else { return implode(':', $this->activeMenuItems); } }