Re: <index-out-of-bounds-error>

[Carl Gay <address@hidden>]

Bruce Hoult wrote:
> 
> In article <3C31FDAE.EB1F7EA7@mediaone.net>, Carl Gay
> <carlgay@mediaone.net> wrote:
> 
> > I notice that in FunDev ""[0] signals <invalid-index-error> but
> > I can't catch it because it's not exported from any library (as
> > far as I can tell).  The best I can do is catch <simple-error>.
> > I don't know what Gwydion does.
> 
> For such things, Gwydion currently throws a <simple-error> with an
> appropriate message/format string and arguments.
> 
> > Should there be a standardized <index-out-of-bounds-error> class
> > exported from common-dylan?  Or is there one in some other lib?
> 
> Possibly.  Why?  What would you do with it?
>
The immediate reason was that I was writing an ad-hoc parser for
tags like <dsp:foo arg1="bar" arg2='baz'/> that appear in the
middle of HTML files.  I pass around an end index (epos) and 
found myself having to constantly check against epos to make
sure I didn't go past it.  It would make my code much cleaner
to simply not worry about it and catch <index-out-of-bounds-error>
at a slightly higher level.  I don't want to mask other errors
by catching <simple-error>, which would indicate a bug in my 
program whereas <index-out-of-bounds-error> might be caused
by the user not closing a tag properly.