How to use visitors correctly?

[GoogleFeud]

Hello! I need to use the swc parser for a project, and I need to traverse the AST as it's getting created, I think visitors are exactly what I need, but I am not exactly sure how to use them. I already have a struct which implements the Visit trait, but I am not sure how to tell the parser to use it! I've been searching the docs for a while and I'm not able to find anything!

[GoogleFeud]

I figured it out! Turns out all I needed is an object which implements the VisitWith trait!

[ifiokjr]

@GoogleFeud do you have a code example? I'm just getting started with rust and swc and I'm trying to achieve something similar.

[GoogleFeud]

Ah, I just realised that visitors do not in fact "visit" AST nodes as they get created, but afterwards. Is there any way to visit nodes as they are being parsed?

The reason I need this is because I need to get the comments above the a specific node, and I think collecting comments along with nodes would be better than guessing based on the position of the comments and nodes.

[kdy1]

Ah, I just realised that visitors do not in fact "visit" AST nodes as they get created, but afterwards. Is there any way to visit nodes as they are being parsed?

No. The parser internally uses visitors, but it's solely for validation.