[Vala] Where does Vala.Paraser create code nodes?

[Christian Johnson <_c_ mail com>]

Hi all!

I've been mucking around in the vala source code, and I got a little stuck.
I can't find where Vala.Parser actually creates the code nodes. According to
https://wiki.gnome.org/Vala/Hacking#Back_to_the_Parser:

"However the Parser calls back to the context and uses it to create code
nodes (mentioned before), then adds these code nodes into the context's root
code node."

But where does it call back to the context? The only places I've found it
simply calls the context to get a property value, not set anything.