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vendor/symfony/translation/Util/ArrayConverter.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Translation\Util;
+
+/**
+ * ArrayConverter generates tree like structure from a message catalogue.
+ * e.g. this
+ *   'foo.bar1' => 'test1',
+ *   'foo.bar2' => 'test2'
+ * converts to follows:
+ *   foo:
+ *     bar1: test1
+ *     bar2: test2.
+ *
+ * @author Gennady Telegin <gtelegin@gmail.com>
+ */
+class ArrayConverter
+{
+    /**
+     * Converts linear messages array to tree-like array.
+     * For example this array('foo.bar' => 'value') will be converted to ['foo' => ['bar' => 'value']].
+     *
+     * @param array $messages Linear messages array
+     */
+    public static function expandToTree(array $messages): array
+    {
+        $tree = [];
+
+        foreach ($messages as $id => $value) {
+            $referenceToElement = &self::getElementByPath($tree, self::getKeyParts($id));
+
+            $referenceToElement = $value;
+
+            unset($referenceToElement);
+        }
+
+        return $tree;
+    }
+
+    private static function &getElementByPath(array &$tree, array $parts): mixed
+    {
+        $elem = &$tree;
+        $parentOfElem = null;
+
+        foreach ($parts as $i => $part) {
+            if (isset($elem[$part]) && \is_string($elem[$part])) {
+                /* Process next case:
+                 *    'foo': 'test1',
+                 *    'foo.bar': 'test2'
+                 *
+                 * $tree['foo'] was string before we found array {bar: test2}.
+                 *  Treat new element as string too, e.g. add $tree['foo.bar'] = 'test2';
+                 */
+                $elem = &$elem[implode('.', \array_slice($parts, $i))];
+                break;
+            }
+
+            $parentOfElem = &$elem;
+            $elem = &$elem[$part];
+        }
+
+        if ($elem && \is_array($elem) && $parentOfElem) {
+            /* Process next case:
+             *    'foo.bar': 'test1'
+             *    'foo': 'test2'
+             *
+             * $tree['foo'] was array = {bar: 'test1'} before we found string constant `foo`.
+             * Cancel treating $tree['foo'] as array and cancel back it expansion,
+             *  e.g. make it $tree['foo.bar'] = 'test1' again.
+             */
+            self::cancelExpand($parentOfElem, $part, $elem);
+        }
+
+        return $elem;
+    }
+
+    private static function cancelExpand(array &$tree, string $prefix, array $node): void
+    {
+        $prefix .= '.';
+
+        foreach ($node as $id => $value) {
+            if (\is_string($value)) {
+                $tree[$prefix.$id] = $value;
+            } else {
+                self::cancelExpand($tree, $prefix.$id, $value);
+            }
+        }
+    }
+
+    /**
+     * @return string[]
+     */
+    private static function getKeyParts(string $key): array
+    {
+        $parts = explode('.', $key);
+        $partsCount = \count($parts);
+
+        $result = [];
+        $buffer = '';
+
+        foreach ($parts as $index => $part) {
+            if (0 === $index && '' === $part) {
+                $buffer = '.';
+
+                continue;
+            }
+
+            if ($index === $partsCount - 1 && '' === $part) {
+                $buffer .= '.';
+                $result[] = $buffer;
+
+                continue;
+            }
+
+            if (isset($parts[$index + 1]) && '' === $parts[$index + 1]) {
+                $buffer .= $part;
+
+                continue;
+            }
+
+            if ($buffer) {
+                $result[] = $buffer.$part;
+                $buffer = '';
+
+                continue;
+            }
+
+            $result[] = $part;
+        }
+
+        return $result;
+    }
+}