using pest_derive in my WASM module

[adam-cyclones]

I am working in a Node.js based WASM project, I would like tell Pest about my grammar, unfortunately the grammar cannot be opened for whatever reason. I can pass files into my lex() function as a WASM export.

I know that the Pest website runs a WASM version with dynamic grammar so this most be possible, although I cant find the Rust src's for it.

How do I derive grammar as a string but not using grammar or grammar_inline.

Note that I am a Rust beginner.

[max-sixty]

Following up on this — is anyone familiar with using pest-derive in a wasm target? We've used pest quite successfully in PRQL, but now we want to put it on the web (like Pest's, ironically). Do we need to rewrite the grammar in pest_vm, like Pest's site? https://github.com/pest-parser/site/blob/master/Cargo.toml

(NB: we don't need a dynamic grammar like Pest's site uses, just a standard grammar, but in wasm)

ref https://github.com/max-sixty/prql/issues/175

[CAD97]

pest_derive reads the file system to find the actual grammar file when you use #[grammar = "path"]. If you use #[grammar_inline], then no file system access is done.

However, if you just want to use a pest generated parser in wasm, any normal pest parser should work fine, as this filesystem access is done at build time.

[max-sixty]

Thanks @CAD97 . I'll have another go on my end — sounds like pest should be compatible with this.

[adam-cyclones]

Wow I halted my project because of this but Id love to give it another shot, Im still watching this from the sidelines