printing and reading source code

[Raoul Schorer]

Hi,

The printer and reader doc states that the default printer can write *core* types to be re-read later.

I am making a kind of "3d IDE" for a custom language using the pict3d lib. I would like to re-use the pict3d types, and prototype with an interpreter that consumes a valid racket datastructure, since my language would not be practical in text format and to avoid writing a lexer/parser.

Is there a way to dump a program datum containing custom types such as those in pict3d to a file as text, to use as "source code"?

For example,

#lang racket
(require pict3d)
(define o (open-input-string))
(write (pos 0 0 0) o)
(read (open-input-port (get-output-string o)))

yields: 'origin, that doesn't mean anything out of the pict3d context. So how can I make that work?

Essentially, I'd like something equivalent to the below (incorrect):

#lang racket
(define o (open-output-string))
(module m racket
         (require pict3d)
         (pos 0 0 0))
(write m o)
(read (open-input-string (get-output-string o)))

Is that possible?

Thanks,

Raoul

[Hendrik Boom]

Let me warn you. Two things that seem to me to be missing from pict3d:
* the ability to paste textures onto objects
* The ability to do intersections on objects
and excisions of one object from another (eaving a hole)
Maybe I just haven't found these features, but uf you think
you might need them, you should watch out.

Also, a fair amount of the code is written in typed racket.
(I'm not sure how much). If you pass in a complex pict3d data structure
from outside, it may take substantial time doing the necessary type check.

And although struct declaration has an option to provide a print function
for the new type (which may well be the deature you seek),
I haven't seen that option being available in typed racket. I'd be
delighted to be wrong about this.

-- hendrik

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