[GuiBuilder] added buildFromAssets method

haxework/gui/GuiBuilder.hx

@@ -2,6 +2,7 @@ package haxework.gui;
 
 
 //ToDo:
+import haxe.Json;
 import flash.errors.Error;
 import openfl.Assets;
 import flash.errors.TypeError;
@@ -38,6 +39,12 @@ class GuiBuilder {
   public static function fill(object:Dynamic, data:Dynamic, ?links:Dynamic):Void {
     new GuiF(object, data, links, data._includes).fill();
   }
+
+  public static function buildFromAssets(resource:String, ?key:String = null, ?links:Dynamic = null):Dynamic {
+    var form:Dynamic = Json.parse(Assets.getText(resource));
+    if (key != null) form = Reflect.field(form, key);
+    return build(form, links);
+  }
 }
 
 class GuiB {