I'm a relative Racket newbie, and I've just enjoyed *Beautiful Racket*. I am working on a Racket implementation of a simple assembler (for the Hack VM in the NAND2Tetris course).
I have a partial implementation up and running using #lang lines. I would like to add a more traditional command-line interface, so I can (eventually) say: hackasm foo.asm on a file without a #lang line. My code is available at https://github.com/rrthomas/hackasm Here's the nub of the problem: I can't work out how to call the language evaluator "manually". I have implemented the language as a dialect, so that the "main.rkt" module is "free" to be used for the command-line interface. (Perhaps this can be fixed too, that would be nice!) A typical assembler file might start like this: #lang hackasm/asm @2 D=A @3 When I run this file (e.g. in DrRacket), I get some output as expected: 0000000000000010 1110110000010000 0000000000000011 (The assembler outputs ASCII-encoded binary!) The contents of my main.rkt looks like this: #lang br/quicklang (require "parser.rkt" "tokenizer.rkt" (submod "asm.rkt" reader)) (module+ main (require racket/cmdline) (let ((filename (command-line #:program "hackasm" ; #:args (filename) filename))) (read-syntax filename (open-input-file filename)))) So far, all I've worked out how to do is run the language's read-syntax function (imported from parser.rkt), and thereby return the parsed syntax object as the result. What I'd like to do is call the evaluator on the parse tree, but after a lot of scratching my head over the Racket documentation and search results, I cannot work out how to do that. I presume the code should look something like: (eval (??? (read-syntax filename (open-input-file filename)))) where in the end I'm eval-ing a form, and where ??? represents something that turns the syntax object into a runnable module. Apologies for the length of this post (I was unsure how I could make it shorter), and thanks in advance for any help! -- https://rrt.sc3d.org -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/racket-users/CAOnWdohy31fHyvUd9rbY8tZFLJKUpevgnZ8jPH2-5_QtSFm%2BhA%40mail.gmail.com.
