New numerical validation.

app/Support/Validation/ValidatesAmountsTrait.php

@@ -0,0 +1,61 @@
+<?php
+/*
+ * ValidatesAmountsTrait.php
+ * Copyright (c) 2024 james@firefly-iii.org
+ *
+ * This file is part of Firefly III (https://github.com/firefly-iii).
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+declare(strict_types=1);
+
+namespace FireflyIII\Support\Validation;
+
+trait ValidatesAmountsTrait
+{
+    protected const string BIG_AMOUNT = '100001709';
+
+    final protected function emptyString(string $value): bool
+    {
+        return '' === $value;
+    }
+
+    final protected function isValidNumber(string $value): bool
+    {
+        return is_numeric($value);
+    }
+
+    final protected function scientificNumber(string $value): bool
+    {
+        return str_contains(strtoupper($value), 'E');
+    }
+
+    final protected function lessOrEqualToZero(string $value): bool
+    {
+        return -1 === bccomp($value, '0') || 0 === bccomp($value, '0');
+    }
+
+    final protected function moreThanLots(string $value): bool
+    {
+        return 1 === bccomp($value, self::BIG_AMOUNT) || 0 === bccomp($value, self::BIG_AMOUNT);
+    }
+
+    final protected function lessThanLots(string $value): bool
+    {
+        $amount = bcmul('-1', self::BIG_AMOUNT);
+
+        return -1 === bccomp($value, $amount) || 0 === bccomp($value, $amount);
+    }
+}