`xgrammar::from_json_schema` can throw uncaught c++ exceptions

[414owen]

If you pass an invalid schema to Grammar::from_json_schema, a c++ exception is thrown, which isn't caught by the xgrammar-rs bindings, and causes the rust process to exit.

An example output:

libc++abi: terminating due to uncaught exception of type xgrammar::LogFatalError: [12:33:08] .../cpp/json_schema_converter.cc:2181: minItems is greater than the number of prefixItems, but additional items are not allowed: 2 > 0

It would be nice to return a Result, so that rust can continue execution.

[eugenebokhan]

Hi @414owen, thank you pointing out this issue. Indeed, at first I tried to match the original API as is, but throwing errors instead of panicking feels like a better option. Feel free to test the lib from the latest commit where I've added a throwing API.

[414owen]

Thanks @eugenebokhan, this works perfectly!

It's not a big problem for my project, but after upgrading to v0.1.29, xgrammar-rs seems to be rebuilt every time I use cargo run, and I suspect rust-analyzer is also rebuilding xgrammar-rs when I change a file, because the language server is extremely laggy.

[eugenebokhan]

@414owen thank you, seems like need to patch build.rs