Added nullable rule

Thanks to @Validation

src/Rules/Nullable.php

@@ -0,0 +1,21 @@
+<?php
+
+
+namespace DG\Validation\Rules;
+
+
+use DG\Validation\Rule;
+
+class Nullable extends Rule
+{
+    /**
+     * Check the $value is valid
+     *
+     * @param mixed $value
+     * @return bool
+     */
+    public function check($value): bool
+    {
+        return true;
+    }
+}

src/Validation.php

@@ -141,6 +141,10 @@ protected function validateAttribute(Attribute $attribute)
         $value = $this->getValue($attributeKey);
         $isEmptyValue = $this->isEmptyValue($value);
 
+        if ($attribute->hasRule('nullable') && $isEmptyValue) {
+            $rules = [];
+        }
+
         $isValid = true;
         foreach ($rules as $ruleValidator) {
             $ruleValidator->setAttribute($attribute);

src/Validator.php

@@ -161,6 +161,7 @@ protected function registerBaseValidators()
             'digits_between'            => new Rules\DigitsBetween,
             'defaults'                  => new Rules\Defaults,
             'default'                   => new Rules\Defaults, // alias of defaults
+            'nullable'                  => new Rules\Nullable,
         ];
 
         foreach ($baseValidator as $key => $validator) {

tests/ValidatorTest.php

@@ -1494,4 +1494,44 @@ public function testRuleUploadedFileInvalidMessages()
         $expectedMessage = "The Sample file type must be 'jpeg', 'png', atau 'bmp'";
         $this->assertEquals($validation->errors()->first('sample'), $expectedMessage);
     }
+
+    public function testIgnoreNextRulesWithNullableRule()
+    {
+        $emptyFile = [
+            'name' => '',
+            'type' => '',
+            'size' => '',
+            'tmp_name' => '',
+            'error' => UPLOAD_ERR_NO_FILE
+        ];
+
+        $invalidFile = [
+            'name' => 'sample.txt',
+            'type' => 'plain/text',
+            'tmp_name' => __FILE__,
+            'size' => 1000,
+            'error' => UPLOAD_ERR_OK,
+        ];
+
+        $data1 = [
+            'file' => $emptyFile,
+            'name' => ''
+        ];
+
+        $data2 = [
+            'file' => $invalidFile,
+            'name' => '[email protected]'
+        ];
+
+        $rules = [
+            'file' => 'nullable|uploaded_file:0,500K,png,jpeg',
+            'name' => 'nullable|email'
+        ];
+
+        $validation1 = $this->validator->validate($data1, $rules);
+        $validation2 = $this->validator->validate($data2, $rules);
+
+        $this->assertTrue($validation1->passes());
+        $this->assertFalse($validation2->passes());
+    }
 }