TYPO3 v15 dev-main snapshot ()

2026-08-10 22:31:09 +02:00
commit af8cc155b5
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+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the TYPO3 CMS project.
+ *
+ * It is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License, either version 2
+ * of the License, or any later version.
+ *
+ * For the full copyright and license information, please read the
+ * LICENSE.txt file that was distributed with this source code.
+ *
+ * The TYPO3 project - inspiring people to share!
+ */
+
+namespace TYPO3\CMS\Core\Utility;
+
+/**
+ * Class with helper functions for permuting items.
+ */
+class PermutationUtility
+{
+    /**
+     * Combines string items of multiple arrays as cross-product into flat items.
+     *
+     * Example:
+     * + meltStringItems([['a', 'b'], ['c', 'd'], ['e', 'f']])
+     * + results into ['ace', 'acf', 'ade', 'adf', 'bce', 'bcf', 'bde', 'bdf']
+     *
+     * @param array[] $payload Distinct array that should be melted
+     * @param string $previousResult Previous item results
+     * @return string[]
+     */
+    public static function meltStringItems(array $payload, string $previousResult = ''): array
+    {
+        $results = [];
+        $items = static::nextItems($payload);
+        foreach ($items as $item) {
+            if (!(is_string($item) || $item instanceof \Stringable)) {
+                throw new \LogicException(
+                    sprintf('Expected string, got %s', gettype($item)),
+                    1578164102
+                );
+            }
+            $resultItem = $previousResult . $item;
+            if (!empty($payload)) {
+                $results = array_merge(
+                    $results,
+                    static::meltStringItems($payload, $resultItem)
+                );
+                continue;
+            }
+            $results[] = $resultItem;
+        }
+        return $results;
+    }
+
+    /**
+     * Combines arbitrary items of multiple arrays as cross-product into flat items.
+     *
+     * Example:
+     * + meltArrayItems(['a','b'], ['c','e'], ['f','g'])
+     * + results into ['a', 'c', 'e'], ['a', 'c', 'f'], ['a', 'd', 'e'], ['a', 'd', 'f'],
+     *                ['b', 'c', 'e'], ['b', 'c', 'f'], ['b', 'd', 'e'], ['b', 'd', 'f'],
+     *
+     * @param array[] $payload Distinct items that should be melted
+     * @param array $previousResult Previous item results
+     * @return array[]
+     */
+    public static function meltArrayItems(array $payload, array $previousResult = []): array
+    {
+        $results = [];
+        $items = static::nextItems($payload);
+        foreach ($items as $item) {
+            $resultItems = $previousResult;
+            $resultItems[] = $item;
+            if (!empty($payload)) {
+                $results = array_merge(
+                    $results,
+                    static::meltArrayItems($payload, $resultItems)
+                );
+                continue;
+            }
+            $results[] = $resultItems;
+        }
+        return $results;
+    }
+
+    protected static function nextItems(array &$payload): iterable
+    {
+        $items = array_shift($payload);
+        if (is_iterable($items)) {
+            return $items;
+        }
+        throw new \LogicException(
+            sprintf('Expected iterable, got %s', gettype($items)),
+            1578164101
+        );
+    }
+}