File information for smart objects

I need to get some information for the smart objects in PSD file using PS scripting.

1. I need to get the file path for the smart objects in a PSD. I found that for linked smart objects, the file path is accessible by opening it up as a document. But it would be nice if I could get the path without opening it up. Is there a way to achieve this using script? Also, for embedded smart objects is it possible to get the file path?

2. Is there a way to distinguish between linked smart objects and embedded smart object using script?

Thanks much in advance for any help.