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2023-01-02 19:56:44 +08:00
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+<?php
+
+/*
+ * This file is part of Respect/Validation.
+ *
+ * (c) Alexandre Gomes Gaigalas <alexandre@gaigalas.net>
+ *
+ * For the full copyright and license information, please view the LICENSE file
+ * that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Respect\Validation\Helpers;
+
+use function checkdate;
+use function date_parse_from_format;
+use function preg_match;
+
+/**
+ * Helper to handle date/time.
+ *
+ * @author Henrique Moody <henriquemoody@gmail.com>
+ */
+trait CanValidateDateTime
+{
+    /**
+     * Finds whether a value is a valid date/time in a specific format.
+     */
+    private function isDateTime(string $format, string $value): bool
+    {
+        $exceptionalFormats = [
+            'c' => 'Y-m-d\TH:i:sP',
+            'r' => 'D, d M Y H:i:s O',
+        ];
+
+        $info = date_parse_from_format($exceptionalFormats[$format] ?? $format, $value);
+
+        if (!$this->isDateTimeParsable($info)) {
+            return false;
+        }
+
+        if ($this->isDateFormat($format)) {
+            return $this->isDateInformation($info);
+        }
+
+        return true;
+    }
+
+    /**
+     * @param int[] $info
+     */
+    private function isDateTimeParsable(array $info): bool
+    {
+        return $info['error_count'] === 0 && $info['warning_count'] === 0;
+    }
+
+    private function isDateFormat(string $format): bool
+    {
+        return preg_match('/[djSFmMnYy]/', $format) > 0;
+    }
+
+    /**
+     * @param mixed[] $info
+     */
+    private function isDateInformation(array $info): bool
+    {
+        if ($info['day']) {
+            return checkdate((int) $info['month'], $info['day'], (int) $info['year']);
+        }
+
+        return checkdate($info['month'] ?: 1, $info['day'] ?: 1, $info['year'] ?: 1);
+    }
+}