DependencyResolver.php
92 lines
| 1 | <?php |
| 2 | |
| 3 | namespace WPStaging\Framework\DependencyResolver; |
| 4 | |
| 5 | use WPStaging\Framework\DependencyResolver\Exceptions\CircularReferenceException; |
| 6 | use WPStaging\Framework\DependencyResolver\Exceptions\MissingReferenceException; |
| 7 | use WPStaging\Framework\DependencyResolver\Exceptions\ResolveException; |
| 8 | |
| 9 | /** |
| 10 | * Class DependencyResolver |
| 11 | * |
| 12 | * This is a port of https://github.com/anthonykgross/dependency-resolver, adapted to run on our PHP requirement version. |
| 13 | * |
| 14 | * @package WPStaging\Framework\DependencyResolver |
| 15 | */ |
| 16 | class DependencyResolver |
| 17 | { |
| 18 | /** |
| 19 | * @throws ResolveException |
| 20 | */ |
| 21 | public static function resolve(array $tree, ResolveBehaviour $resolveBehaviour = null) |
| 22 | { |
| 23 | if (is_null($resolveBehaviour)) { |
| 24 | $resolveBehaviour = ResolveBehaviour::create()->setThrowOnCircularReference(true); |
| 25 | } |
| 26 | $resolved = []; |
| 27 | $unresolved = []; |
| 28 | |
| 29 | // Resolve dependencies for each table |
| 30 | foreach (array_keys($tree) as $table) { |
| 31 | list($resolved, $unresolved, $returnImmediately) = self::resolver($table, $tree, $resolved, $unresolved, $resolveBehaviour); |
| 32 | |
| 33 | if ($returnImmediately) { |
| 34 | return $resolved; |
| 35 | } |
| 36 | } |
| 37 | |
| 38 | return $resolved; |
| 39 | } |
| 40 | |
| 41 | /** |
| 42 | * @param int|string $item |
| 43 | * |
| 44 | * @throws ResolveException |
| 45 | */ |
| 46 | private static function resolver($item, array $items, array $resolved, array $unresolved, ResolveBehaviour $resolveBehaviour) |
| 47 | { |
| 48 | $unresolved[] = $item; |
| 49 | |
| 50 | foreach ($items[$item] as $dep) { |
| 51 | if (!array_key_exists($dep, $items)) { |
| 52 | if ($resolveBehaviour->isThrowOnMissingReference()) { |
| 53 | throw new MissingReferenceException($item, $dep); |
| 54 | } |
| 55 | |
| 56 | return [$resolved, $unresolved, true]; |
| 57 | } |
| 58 | |
| 59 | if (in_array($dep, $resolved, true)) { |
| 60 | continue; |
| 61 | } |
| 62 | |
| 63 | if (in_array($dep, $unresolved, true)) { |
| 64 | if ($resolveBehaviour->isThrowOnCircularReference()) { |
| 65 | throw new CircularReferenceException($item, $dep); |
| 66 | } |
| 67 | |
| 68 | return [$resolved, $unresolved, true]; |
| 69 | } |
| 70 | |
| 71 | $unresolved[] = $dep; |
| 72 | list($resolved, $unresolved, $returnImmediately) = self::resolver($dep, $items, $resolved, $unresolved, $resolveBehaviour); |
| 73 | |
| 74 | if ($returnImmediately) { |
| 75 | return [$resolved, $unresolved, $returnImmediately]; |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | // Add $item to $resolved if it's not already there |
| 80 | if (!in_array($item, $resolved, true)) { |
| 81 | $resolved[] = $item; |
| 82 | } |
| 83 | |
| 84 | // Remove all occurrences of $item in $unresolved |
| 85 | while (($index = array_search($item, $unresolved, true)) !== false) { |
| 86 | unset($unresolved[$index]); |
| 87 | } |
| 88 | |
| 89 | return [$resolved, $unresolved, false]; |
| 90 | } |
| 91 | } |
| 92 |