Self-Hosted REPL

Because read, eval and print are available in every backend, a REPL can be written in RontoLisp itself and compiled to a standalone .class or .wasm:

Example (repl.lisp):

(princ "> ")
(setq form (read))
(while form
  (print (eval form))
  (princ "> ")
  (setq form (read)))

rontolisp repl.lisp               # interpret
rontolisp repl.lisp -o repl.class
java repl                                                                  # REPL on the JVM
rontolisp repl.lisp -o repl.wasm
wasmtime run -W gc repl.wasm                                               # REPL on WASM

> (defun square (x) (* x x))
square
> (mapcar #'square '(1 2 3))
(1 4 9)
> (- 5)
-5

read returns nil at EOF, so the loop exits on Ctrl-D (entering nil or () also ends it). Each form entered at the prompt is parsed by the runtime reader and evaluated by the embedded eval runtime, so the Compiled eval limitations and Compiled read/load limitations apply.