-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi Neil,
On 25-11-11 14:47, Neil Van Dyke wrote: > As an immediate solution, I suggest simply not trying to use R6RS > compatibility libraries with Racket, and instead just use the > Racket language. Spend your energy on your application. (I don't > want to get into why right now, but my book will have an entire > section or chapter entitled "Don't Use R6RS".) > > If you have some super-good reason for wanting to use R6RS, a few > more comments... All I really wanted was the mod0 function from r6rs, which I can get without causing any further problems doing: (require (only-in rnrs/base-6 mod0)) > The particular problem you're having is due to "rnrs/base-6" > wanting to use mutable pairs, while libraries implemented in Racket > want to use immutable pairs. They *could* be made more > interoperable, but all the ways I can think of would have other > undesirable costs, and you'd either end up getting bugs in other > places or get really lousy performance. I guess I was under the mistaken impression that all this stuff was compatible with each other. I can live with that not being so, but it seems that it might then be a good idea to include some of the functions that r6rs has, but racket doesn't, in some other module. > As a workaround if you *really* want to use R6RS, but also use > "regexp-split", is to make a tiny "#lang racket/base" module that > wraps Racket's "regexp-split" to convert any pairs in the return > value to mpairs. > > BTW, if you want to parse input like this from a port, you can use > Racket regexp operations or a grammar-based parser directly on the > port, rather than reading a line and then doing a "regexp-split" on > the line. The latter way is a Perl idiomatic way of parsing a > language like this, and that way will also work in Racket, but > there are arguably better ways. Thanks, I had no idea. Marijn -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk7TQdgACgkQp/VmCx0OL2xVJQCgwYLCsTuAIPyNynYhVnLKjKIW znYAoMQkfYKLuLsE50VV8REBcVcLypPT =B68t -----END PGP SIGNATURE----- _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/dev
