testing yoga and tinyxml2 to read some attributes from file

data/layout.xml

@@ -1,4 +1,5 @@
 <?xml version="1.0"?>
 <layout>
-  <rect></rect>
+  <rect width="10" height="10" />
+  <circle div="10" width="100%" inner_radius="10" outer_radius="50" />
 </layout>

engine/app.cpp

@@ -53,10 +53,32 @@ void App::init()
         "   frag = col;"
         "}";
 
+    auto y_root = YGNodeNew();
     tinyxml2::XMLDocument xml;
     auto ret = xml.LoadFile("data\\layout.xml");
     auto root = xml.RootElement();
-//    root->
+    auto child = root->FirstChildElement();
+    while (child)
+    {
+        printf("Element %s: ", child->Name());
+        auto attr = child->FirstAttribute();
+        auto y_node = YGNodeNew();
+        YGNodeInsertChild(y_root, y_node, 0);
+        while (attr)
+        {
+            printf("%s=%s ", attr->Name(), attr->Value());
+            if (strcmp("width", attr->Name()) == 0)
+            {
+                if (strchr(attr->Value(), '%'))
+                    YGNodeStyleSetWidthPercent(y_node, attr->FloatValue());
+                else
+                    YGNodeStyleSetWidth(y_node, attr->FloatValue());
+            }
+            attr = attr->Next();
+        }
+        printf("\n");
+        child = child->NextSiblingElement();
+    }
 
     shader.create(shader_v, shader_f);
     shader_color.create(shader_color_v, shader_color_f);