Re: Another ${(z)param} buglet

[Peter Stephenson <Peter.Stephenson@xxxxxxx>]

On Thu, 09 Dec 2010 07:42:33 -0800
Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx> wrote:
> Thanks for putting in this effort, but on reflection I think it's
> important to be able to specify whether comments are handled or not.
> There isn't yet a (Z) flag; perhaps we could make that the equivalent
> of turning on interactivecomments, and leave (z) as it was?

Wondered about that, but there are so many possible tweaks to word
splitting I'm trying to think of a more flexible way than simply two
letters (that doesn't involve anything as gross as a shell option).  The
best I can think of is extending the syntax to append options, a bit
like (q) can have the q multiple or a - added, but maybe less gross
e.g. explicit option flags like z+c+ to turn on comment handling (and
possibly z+C+ to strip comments). '+' appears not to be taken so would
work without complications and there's a mnemonic that there's more to
come (compared with "(q-)").

> I'm undecided on stripping comments vs. leaving them as "tokens" for
> manual removal, but I lean to leaving them, as it's possible to remove
> them once they've been parsed but it's practically impossible to put
> them back once they're gone.

That was my thinking, too.

> Maybe this gives someone [*] enough to go on to be able to fix that
> here-document problem I encountered.

That's not easily fixable down here.  You need some parsing to tell
you where the here documents are and how they fit together.  You could do
it within bufferwords() by assuming a << token is a here document and
being clever with multiple lines, but it's a real mess; they even need
to stack because of multios.

-- 
Peter Stephenson <pws@xxxxxxx>            Software Engineer
Tel: +44 (0)1223 692070                   Cambridge Silicon Radio Limited
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