Merge branch 'pull-71'

* pull-71:
  HACK: limit recursive expansion to 7 levels

Author: justinrainbow

src/JsonSchema/RefResolver.php

@@ -21,6 +21,15 @@
  */
 class RefResolver
 {
+    /**
+     * HACK to prevent too many recursive expansions.
+     * Happens e.g. when you want to validate a schema against the schema
+     * definition.
+     *
+     * @var integer
+     */
+    protected static $depth = 0;
+
     /**
      * @var UriRetrieverInterface
      */
@@ -81,7 +90,13 @@ public function getUriRetriever()
      */
     public function resolve($schema, $sourceUri = null)
     {
+        if (self::$depth > 7) {
+            return;
+        }
+        ++self::$depth;
+
         if (! is_object($schema)) {
+            --self::$depth;
             return;
         }
 
@@ -109,6 +124,8 @@ public function resolve($schema, $sourceUri = null)
         foreach (array('dependencies', 'patternProperties', 'properties') as $propertyName) {
             $this->resolveObjectOfSchemas($schema, $propertyName, $sourceUri);
         }
+
+        --self::$depth;
     }
 
     /**