astv

Crystal AST viewer inspired by https://github.com/ko1/astv

Web (static)

The static UI lives in web/index.html and expects a web/astv.wasm module to be available.

Build the WASM module (Linux):

make wasm-build

Serve:

ruby -run -e httpd web -p 8000

python -m http.server 8000 --directory web

[!NOTE] Crystal's wasm32 target compiles with no GC (gc/none), so the WASM module never frees memory: each parse/lex call leaks its allocations and the module's heap grows monotonically. This is intentionally left as-is — it is harmless for typical use, and reloading the page resets everything.

CLI (Linux)

make build

Run (reads from stdin):

make run

Demo:

make demo