fix memory leak

jsonform.gadget.js

 /*jslint nomen: true, maxlen: 200, indent: 2, maxerr: 100*/
-/*global window, document, URL, rJS, RSVP, jIO, tv4, location */
+/*global window, document, URL, rJS, RSVP, jIO, tv4, Blob */
 
-(function (window, document, location, rJS, RSVP, jIO, tv4) {
+(function (window, document, Blob, rJS, RSVP, jIO, tv4) {
   "use strict";
   var expandSchema;
 
@@ -11,6 +11,18 @@
     });
   }
 
+  function getUrlWithoutHash(url) {
+    if (typeof url !== "string") {
+      url = url.href;
+    }
+    var index = url.indexOf('#');
+
+    if (index >= 0) {
+      return url.substring(0, index);
+    }
+    return url;
+  }
+
   function URLwithJio(url, base_url) {
     var urn_prefix,
       pathname,
@@ -209,50 +221,44 @@
   }
 
   function map_url(g, download_url) {
-    var mapped_url = download_url,
-      hash = mapped_url.hash,
+    var hash = download_url.hash,
+      mapped_url = getUrlWithoutHash(download_url),
       i,
       schemas = g.props.schemas,
       next_mapped_url;
     // simple defence forever loop
     for (i = 0; i < Object.keys(schemas).length; i += 1) {
-      next_mapped_url = g.props.schemas[mapped_url.origin + mapped_url.pathname + mapped_url.search];
+      next_mapped_url = schemas[mapped_url];
       if (next_mapped_url === undefined) {
         break;
       }
-      mapped_url = next_mapped_url;
-      if (typeof mapped_url !== "string") {
-        mapped_url = resolveLocalReference(mapped_url, hash);
-        break;
-      }
-      mapped_url = new URL(mapped_url, g.__path);
+      mapped_url = new URL(next_mapped_url, g.__path);
       if (hash[0] === '#') {
         hash = hash.slice(1);
       }
       if (hash === '/') {
         hash = '';
       }
-      hash = mapped_url.hash + hash;
+      hash = mapped_url.hash || "#" + hash;
+      mapped_url = getUrlWithoutHash(mapped_url);
     }
-    return mapped_url;
+    return new URL(mapped_url + hash);
   }
 
   function loadJSONSchema(g, $ref, path) {
     var protocol,
+      abs_url,
       url,
       download_url,
       hash,
-      mapped_url,
       queue;
     // XXX need use `id` property
     if (!path) {
       path = "/";
     }
-    url = convertUrlToAbsolute(g, path, decodeURI($ref), window.location);
-    mapped_url = map_url(g, url);
-    if (mapped_url instanceof URL || mapped_url instanceof URLwithJio) {
-      url = mapped_url;
-    }
+    abs_url = convertUrlToAbsolute(g, path, decodeURI($ref), window.location);
+    url = map_url(g, abs_url);
+    abs_url = abs_url.href;
     protocol = url.protocol;
     if (protocol === "http:") {
       if (window.location.protocol !==  protocol) {
@@ -261,35 +267,27 @@
         // throw new Error("You cannot mixed http and https calls");
       }
     }
-    download_url = url.origin + url.pathname + url.search;
+    download_url = getUrlWithoutHash(url);
     hash = url.hash;
     url = url.href;
-    if (!(mapped_url instanceof URL || mapped_url instanceof URLwithJio)) {
+    if (download_url.startsWith("urn:jio:")) {
       queue = RSVP.Queue()
         .push(function () {
-          return mapped_url;
+          return g.resolveExternalReference(download_url);
         });
     } else {
-      if (download_url.startsWith("urn:jio:")) {
-        queue = RSVP.Queue()
-          .push(function () {
-            return g.resolveExternalReference(download_url);
-          });
-      } else {
-        queue = RSVP.Queue()
-          .push(function () {
-            return downloadJSON(download_url);
-          });
-      }
-      queue
-        .push(function (json) {
-          if (checkHardCircular(g, path, url)) {
-            throw new Error("Circular reference detected");
-          }
-          return resolveLocalReference(json, hash);
+      queue = RSVP.Queue()
+        .push(function () {
+          return downloadJSON(download_url);
         });
     }
     return queue
+      .push(function (json) {
+        if (checkHardCircular(g, path, url)) {
+          throw new Error("Circular reference detected");
+        }
+        return resolveLocalReference(json, hash);
+      })
       .push(undefined, function (err) {
         // XXX it will be great to have ability convert json_pointers(hash)
         // in line numbers for pointed to line in rich editors.
@@ -322,7 +320,9 @@
         } else {
           // save map url only for correctly resolved schema
           // otherwise we have issue in convertToRealWorldSchemaPath
-          g.props.schema_map[path] = url;
+          if (!g.props.hasOwnProperty(path)) {
+            g.props.schema_map[path] = abs_url;
+          }
         }
         schemaPushSchemaPart(g.props.schema, path, JSON.parse(JSON.stringify(schema_part)));
         // console.log(g.props.schema[""]);
@@ -602,7 +602,9 @@
             mapped_url = convertUrlToAbsolute(g, schema_path, '#' + schema_path, window.location);
             // XXX                     /?
             mapped_url = mapped_url + 'definitions/' + key;
-            g.props.schemas[url] = mapped_url;
+            if (!g.props.schemas.hasOwnProperty(url)) {
+              g.props.schemas[url] = mapped_url;
+            }
           }
         }
       }
@@ -790,7 +792,11 @@
         z.key = options.key;
       }
       if (options.hasOwnProperty("schema")) {
-        z.schema = JSON.stringify(options.schema);
+        if (typeof options.schema === "string") {
+          z.schema = options.schema;
+        } else {
+          z.schema = JSON.stringify(options.schema);
+        }
       }
       if (options.hasOwnProperty("schema_url")) {
         z.schema_url = options.schema_url;
@@ -862,7 +868,8 @@
                   window.location.toString();
             g.props.schema[""] = schema;
             g.props.schema_map["/"] = schema_url;
-            g.props.schemas[schema_url] = schema;
+            g.props.schemas[schema_url] = URL
+              .createObjectURL(new Blob([g.state.schema], {type : 'application/json'}));
             queue = expandSchemaForField(g, schema, "/", true);
           } else {
             schema_url = g.state.schema_url ||
@@ -936,4 +943,4 @@
       return {};
     }, {mutex: 'changestate'});
 
-}(window, document, location, rJS, RSVP, jIO, tv4));
+}(window, document, Blob, rJS, RSVP, jIO, tv4));
\ No newline at end of file