Introduce allow_null option

Author: n0str

EditorJS/BlockHandler.php

@@ -139,7 +139,8 @@ private function validate($rules, $blockData)
             /**
              * Do not check element type if it is not required and null
              */
-            if (isset($rule['required']) && $rule['required'] === false && $value === null) {
+            if (isset($rule['required']) && $rule['required'] === false &&
+                isset($rule['allow_null']) && $rule['allow_null'] === true && $value === null) {
                 continue;
             }
 

tests/TypeTest.php

@@ -68,9 +68,18 @@ public function testStringFailed()
         $this->assertException($callable, EditorJSException::class, null, 'Option \'string_test\' with value `17` must be string');
     }
 
-    public function testNullNotRequired()
+    public function testAllowedNullNotRequired()
     {
-        new EditorJS('{"blocks":[{"type":"test","data":{"string_test": null}}]}', $this->configuration);
+        new EditorJS('{"blocks":[{"type":"test","data":{"int_test": null}}]}', $this->configuration);
+    }
+
+    public function testDisallowedNullNotRequired()
+    {
+        $callable = function () {
+            new EditorJS('{"blocks":[{"type":"test","data":{"string_test": null}}]}', $this->configuration);
+        };
+
+        $this->assertException($callable, EditorJSException::class, null, 'string_test\' with value `` must be string');
     }
 
     public function testNullRequired()

tests/samples/type-test-config-required.json

@@ -3,7 +3,8 @@
     "test": {
       "string_test": {
         "type": "string",
-        "required": true
+        "required": true,
+        "allow_null": true
       }
     }
   }

tests/samples/type-test-config.json

@@ -7,11 +7,13 @@
       },
       "int_test": {
         "type": "integer",
-        "required": false
+        "required": false,
+        "allow_null": true
       },
       "string_test": {
         "type": "string",
-        "required": false
+        "required": false,
+        "allow_null": false
       }
     }
   }