72 lines
2.2 KiB
PHP
72 lines
2.2 KiB
PHP
<?php
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declare(strict_types = 1);
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// {{{ License
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// This file is part of GNU social - https://www.gnu.org/software/social
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//
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// GNU social is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// GNU social is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with GNU social. If not, see <http://www.gnu.org/licenses/>.
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// }}}
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/**
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* String formatting utilities
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*
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* @package GNUsocial
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* @category Util
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*
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* @author Hugo Sales <hugo@hsal.es>
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* @copyright 2020-2021 Free Software Foundation, Inc http://www.fsf.org
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* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
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*/
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namespace App\Util;
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use Stringable;
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abstract class Functional
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{
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/**
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* TODO replace with \Functional\cartesian_product when it gets merged upstream
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*
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* @param array<array<string|Stringable>> $collections
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*/
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public static function cartesianProduct(array $collections, string|array $separator = ''): array
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{
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$aggregation = [];
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$left = array_shift($collections);
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while (true) {
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$right = array_shift($collections);
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foreach ($left as $l) {
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foreach ($right as $r) {
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if (\is_string($separator)) {
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$aggregation[] = "{$l}{$separator}{$r}";
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} elseif (\is_array($separator)) {
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foreach ($separator as $sep) {
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$aggregation[] = "{$l}{$sep}{$r}";
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}
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}
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}
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}
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if (empty($collections)) {
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break;
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} else {
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$left = $aggregation;
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$aggregation = [];
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}
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}
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return $aggregation;
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}
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}
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