Luke Palmer wrote:
> Ooh! Why don't we have a dont command! With several variants:
> dont FILE
> dont BLOCK
>
> dont { print "Boo" }
>
> Would print:
>
>
You really *should* be more careful what you wish for Luke.
The following was just uploaded to the CPAN...
Damian
-----cut----------cut----------cut----------cut----------cut----------cut-----
NAME
Acme::Don't - The opposite of `do'
VERSION
This document describes version 1.00 of Acme::Don't, released May 1,
2002.
SYNOPSIS
use Acme::Don't;
don't { print "This won't be printed\n" }; # NO-OP
DESCRIPTION
The Acme::Don't module provides a `don't' command, which is the opposite
of Perl's built-in `do'.
It is used exactly like the `do BLOCK' function except that, instead of
executing the block it controls, it...well...doesn't.
Regardless of the contents of the block, `don't' returns `undef'.
You can even write:
don't {
# code here
} while condition();
And, yes, in strict analogy to the semantics of Perl's magical
`do...while', the `don't...while' block is *unconditionally* not done
once before the test. ;-)
Note that the code in the `don't' block must be syntactically valid
Perl. This is an important feature: you get the accelerated performance
of not actually executing the code, without sacrificing the security of
compile-time syntax checking.
LIMITATIONS
Doesn't (yet) implement the opposite of `do STRING'. The current
workaround is to use:
don't {"filename"};
AUTHOR
Damian Conway ([EMAIL PROTECTED])
BLAME
Luke Palmer really should be *far* more careful what he idly wishes for.
BUGS
Unlikely, since it doesn't actually do anything. However, bug reports
and other feedback are most welcome.
COPYRIGHT
Copyright (c) 2002, Damian Conway. All Rights Reserved. This module is
free software. It may be used, redistributed and/or modified under the
terms of the Perl Artistic License (see
http://www.perl.com/perl/misc/Artistic.html)
