How to access metals which are connected to the metal I selected

Hello：

I want to write a skill code to calculate the metal‘s resistance in layout. The tool I use is candace 5.14.

I want to make this come true in the skill code：when I select the metal in the top cellview , the skill code can

trace all the metals which are connected to the metal I selected. I can access to all the metals and vias’ properties.

These metals and vias are may not in the same cellView level.They are hierarchy.

So I can calculate the whole resistance of  whole path which connected to the metal I selected！

Thank  you very much！