allow to delegate rule validation to (Validated)Control

Author: hrach

src/Forms/Controls/BaseControl.php

@@ -12,7 +12,10 @@
 use Nette;
 use Nette\Forms\Control;
 use Nette\Forms\Form;
+use Nette\Forms\Rule;
 use Nette\Forms\Rules;
+use Nette\Forms\ValidatedControl;
+use Nette\Forms\Validator;
 use Nette\Utils\Html;
 use Stringable;
 use function array_unique, explode, func_get_arg, func_num_args, get_parent_class, implode, is_array, sprintf, str_contains;
@@ -38,7 +41,7 @@
  * @property-deprecated array $options
  * @property-read string $error
  */
-abstract class BaseControl extends Nette\ComponentModel\Component implements Control
+abstract class BaseControl extends Nette\ComponentModel\Component implements Control, ValidatedControl
 {
 	public static string $idMask = 'frm-%s';
 
@@ -469,6 +472,16 @@ public function validate(): void
 	}
 
 
+	public function validateRule(Rule $rule, mixed ...$args): bool
+	{
+		$op = $rule->validator;
+		$cb = is_string($op) && strncmp($op, ':', 1) === 0
+			? [Validator::class, 'validate' . ltrim($op, ':')]
+			: $op;
+		return $cb($this, ...$args);
+	}
+
+
 	/**
 	 * Adds error message to the list.
 	 */

src/Forms/Rules.php

@@ -339,8 +339,17 @@ private function adjustOperation(Rule $rule): void
 	private static function getCallback(Rule $rule)
 	{
 		$op = $rule->validator;
-		return is_string($op) && strncmp($op, ':', 1) === 0
-			? [Validator::class, 'validate' . ltrim($op, ':')]
-			: $op;
+		if (!(is_string($op) && strncmp($op, ':', 1) === 0)) {
+			return $op;
+		}
+
+		if ($rule->control instanceof ValidatedControl) {
+			return function (...$args) use ($rule) {
+				array_shift($args); // drop the control
+				return $rule->control->validateRule($rule, ...$args);
+			};
+		}
+
+		return [Validator::class, 'validate' . ltrim($op, ':')];
 	}
 }

src/Forms/ValidatedControl.php

@@ -0,0 +1,15 @@
+<?php
+
+/**
+ * This file is part of the Nette Framework (https://nette.org)
+ * Copyright (c) 2004 David Grudl (https://davidgrudl.com)
+ */
+
+declare(strict_types=1);
+
+namespace Nette\Forms;
+
+interface ValidatedControl extends Control
+{
+	function validateRule(Rule $rule, mixed ...$args): bool;
+}