Allow more flexibility for rule input

Author: axlon

README.md

@@ -69,7 +69,7 @@ use Axlon\PostalCodeValidation\Rules\PostalCode;
 
 $request->validate([
     'postal_code' => [
-        PostalCode::of(['NL', 'BE']),
+        PostalCode::of('NL', 'BE'),
     ],
 ]);
 ```

src/Rules/PostalCode.php

@@ -38,7 +38,7 @@ final class PostalCode implements ValidationRule, DataAwareRule
      */
     public function __construct(
         public readonly array $parameters,
-        public RegexCollectionContract $regexes = new RegexCollection(),
+        private readonly RegexCollectionContract $regexes = new RegexCollection(),
     ) {
     }
 
@@ -57,16 +57,15 @@ private static function isCountryCode(mixed $value): bool
     /**
      * Create a new validation rule.
      *
-     * @param array<string>|string $countries
+     * @param array<string>|string ...$parameters
      * @return self
      */
-    public static function of(array|string $countries): self
+    public static function of(array|string ...$parameters): self
     {
-        if (is_string($countries)) {
-            $countries = [$countries];
-        }
+        /** @var array<string> $parameters */
+        $parameters = Arr::flatten($parameters, depth: 1);
 
-        return new self($countries);
+        return new self($parameters);
     }
 
     /**

tests/Rules/PostalCodeTest.php

@@ -42,11 +42,11 @@ public function testItCreatesInstanceFromArray(): void
         self::assertSame(['AA', 'BB'], $rule->parameters);
     }
 
-    public function testItCreatesInstanceFromString(): void
+    public function testItCreatesInstanceFromStrings(): void
     {
-        $rule = PostalCode::of('AA');
+        $rule = PostalCode::of('AA', 'BB');
 
-        self::assertSame(['AA'], $rule->parameters);
+        self::assertSame(['AA', 'BB'], $rule->parameters);
     }
 
     public function testItFailsWhenCountryCodeFieldIsEmpty(): void