How to use log module?

[lgtinsea]

I see log module in tree-sitter. Someone introduce the usage in tree-sitter/tree-sitter#1129.
Can anyone tell me how to use log module in java-tree-sitter to get the log of c/cpp code?

[sogaiu]

A cursory glance at this suggests there may not be any code that exposes the functionality to Java.

If there were, I think one would find traces of TSLogger (I didn't find any among .java or .cc files via grep). For comparison, for the Rust bindings, there is evidence here and for the web-tree-sitter / wasm code there is this.

[lgtinsea]

Thank you very much for your help. I couldn't find the relevant code either, so I'm here to see if there's a miracle.

By the way, debugging when java calls c/cpp code is is a little difficult.

[sogaiu]

IIUC, by default, the TSLogger functionality is specifically tied to calls made from the parser (implemented in C - parser.c).

If it is working I think you end up seeing the results of calls to LOG and LOG_LOOKAHEAD, e.g. like this because they both call ts_parser__log.

The tree-sitter command line program uses TSLogger via its parse subcommand with --debug / -D. There is a discussion and an issue at the tree-sitter repository that touches on some of the related details. Some people (e.g. tree-sitter grammar developers) use this functionality when investigating issues with the grammars they are working on.

For java-tree-sitter, it looks like the current maintainer has been busy / unavailable for some time, so it's unclear if / when logging functionality of the sort described above would be added.