[racket-dev] `string-split'

On Thu, Apr 19, 2012 at 14:53, Matthew Flatt <mflatt at cs.utah.edu> wrote:

> At Thu, 19 Apr 2012 14:43:44 +0200, Laurent wrote:
> > On Thu, Apr 19, 2012 at 14:33, Matthew Flatt <mflatt at cs.utah.edu> wrote:
> >
> > > I agree with this: we should add `string-split', the one-argument case
> > > should be as Eli wrote,
> >
> >
> > About this I'm not sure, as one cannot reproduce this behavior by
> providing
> > an argument (or it could make the difference between
> string-as-not-regexps
> > and regexps? Wouldn't this be different from other places?).
>
> I'm suggesting that supplying `#f' as the argument would be the same as
> not supplying the argument.
>
> It is a special case, though. I don't mind the specialness here,
> because I see the job of `string-split' as making a couple of useful
> special cases easy (as opposed to the generality of `regexp-split').
>

Then instead of #f one idea is to go one step further and consider
different useful cases based on input symbols like 'whitespaces,
'non-alpha, etc. ? Or even a list of string/symbols that can be used as a
splitter.
That would make a more powerful function for sure. (It's just that I'm
troubled by the uniqueness of this magical default argument)

Laurent



>
>
> > It would then appear somewhat magical. To me the " " default splitter
> seems
> > more intuitive.
> >
> > Laurent
> >
> >
> > > and the two-argument case should be as Laurent
> > > wrote. (Probably the optional second argument should be string-or-#f,
> > > where #f means to use #px"\\s+".)
> > >
> > > At Thu, 19 Apr 2012 14:30:31 +0200, Laurent wrote:
> > > >  (define (string-split str [sep #px"\\s+"])
> > > > >    (remove* '("") (regexp-split sep str)))
> > > > >
> > > >
> > > > Nearly, I meant something more like this:
> > > >
> > > > (define (string-split str [splitter " "])
> > > >   (regexp-split (regexp-quote splitter) str))
> > > >
> > > > No regexp from the user POV, and much easier to use with little
> > > knowledge.
> > > > _________________________
> > > >   Racket Developers list:
> > > >   http://lists.racket-lang.org/dev
> > >
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.racket-lang.org/dev/archive/attachments/20120419/08ef3e56/attachment.html>