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<?php
/**
* @copyright Copyright (c) 2021, Jonas Meurer <jonas@freesources.org>
*
* @author Jonas Meurer <jonas@freesources.org>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OC;
use Psr\Log\LoggerInterface;
/**
* Sort scripts topologically by their dependencies
* Implementation based on https://github.com/marcj/topsort.php
*/
class AppScriptSort {
/** @var LoggerInterface */
private $logger;
public function __construct(LoggerInterface $logger) {
$this->logger = $logger;
}
/**
* Recursive topological sorting
*
* @param AppScriptDependency $app
* @param array $parents
* @param array $scriptDeps
* @param array $sortedScriptDeps
*/
private function topSortVisit(
AppScriptDependency $app,
array &$parents,
array &$scriptDeps,
array &$sortedScriptDeps): void {
// Detect and log circular dependencies
if (isset($parents[$app->getId()])) {
$this->logger->error('Circular dependency in app scripts at app ' . $app->getId());
}
// If app has not been visited
if (!$app->isVisited()) {
$parents[$app->getId()] = true;
$app->setVisited(true);
foreach ($app->getDeps() as $dep) {
if ($app->getId() === $dep) {
// Ignore dependency on itself
continue;
}
if (isset($scriptDeps[$dep])) {
$newParents = $parents;
$this->topSortVisit($scriptDeps[$dep], $newParents, $scriptDeps, $sortedScriptDeps);
}
}
$sortedScriptDeps[] = $app->getId();
}
}
/**
* @return array scripts sorted by dependencies
*/
public function sort(array $scripts, array $scriptDeps): array {
// Sort scriptDeps into sortedScriptDeps
$sortedScriptDeps = [];
foreach ($scriptDeps as $app) {
$parents = [];
$this->topSortVisit($app, $parents, $scriptDeps, $sortedScriptDeps);
}
// Sort scripts into sortedScripts based on sortedScriptDeps order
$sortedScripts = [];
foreach ($sortedScriptDeps as $app) {
$sortedScripts[$app] = $scripts[$app] ?? [];
}
// Add remaining scripts
foreach (array_keys($scripts) as $app) {
if (!isset($sortedScripts[$app])) {
$sortedScripts[$app] = $scripts[$app];
}
}
return $sortedScripts;
}
}
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