feat: add support for $ref

Author: DannyvdSluijs

src/JsonSchema/Constraints/Drafts/Draft06/Draft06Constraint.php

@@ -7,12 +7,19 @@
 use JsonSchema\ConstraintError;
 use JsonSchema\Constraints\Constraint;
 use JsonSchema\Entity\JsonPointer;
+use JsonSchema\SchemaStorage;
+use JsonSchema\Uri\UriRetriever;
 
 class Draft06Constraint extends Constraint
 {
-    public function __construct()
+    public function __construct(\JsonSchema\Constraints\Factory $factory = null)
     {
-        parent::__construct(new Factory());
+
+        parent::__construct(new Factory(
+            $factory ? $factory->getSchemaStorage() : new SchemaStorage(),
+            $factory ? $factory->getUriRetriever() : new UriRetriever(),
+            $factory ? $factory->getConfig() : Constraint::CHECK_MODE_NORMAL,
+        ));
     }
 
     public function check(&$value, $schema = null, ?JsonPointer $path = null, $i = null): void
@@ -26,6 +33,7 @@ public function check(&$value, $schema = null, ?JsonPointer $path = null, $i = n
         }
 
         // Apply defaults
+        $this->checkForKeyword('ref', $value, $schema, $path, $i);
         $this->checkForKeyword('required', $value, $schema, $path, $i);
         $this->checkForKeyword('contains', $value, $schema, $path, $i);
         $this->checkForKeyword('properties', $value, $schema, $path, $i);

src/JsonSchema/Constraints/Drafts/Draft06/Factory.php

@@ -41,5 +41,6 @@ class Factory extends \JsonSchema\Constraints\Factory
         'pattern' => PatternConstraint::class,
         'properties' => PropertiesConstraint::class,
         'items' => ItemsConstraint::class,
+        'ref' => RefConstraint::class,
     ];
 }