[plt-scheme] s-exp and custom reader

On Mon, Jul 14, 2008 at 1:50 PM, Sam TH <samth at ccs.neu.edu> wrote:

> It should be fairly easy to write a language like `s-exp' but where
> the reader and the language are both specified.  Invocations would
> look something like this:
>
> #lang custom (lib "my-reader.ss") (lib "my-lang.ss")
> ..code goes here..
>

Agreed - it should be fairly straight forward. But as `#lang` cannot
take a `(planet
...)` module spec - the language custom will have to be built-in instead of
user supplied, otherwise anyone doing this will have to manually copy the
custom lib to collects-dir with each upgrade.

These solutions came about because of the restrictions placed on `#lang`.
Are there technical difficulties for `#lang` to handle `(planet ...)`?

The nice thing of `#lang` versus `#reader` is of course that `#lang` denotes
the use of a language...

Thanks,
yc
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