* Re: Problem with associative arrays
@ 1998-12-15 8:12 Sven Wischnowsky
0 siblings, 0 replies; 4+ messages in thread
From: Sven Wischnowsky @ 1998-12-15 8:12 UTC (permalink / raw)
To: zsh-workers
Bart Schaefer wrote:
> ...
>
> You have to use `typeset -A a` to get an associative array. `set -A a`
> creates an ordinary array. I realize this is confusing, which is why I
> originally used a different option letter for typeset, but compatibility
> with ksh requires -A.
Oops. Sorry.
Bye
Sven
--
Sven Wischnowsky wischnow@informatik.hu-berlin.de
^ permalink raw reply [flat|nested] 4+ messages in thread
* Problem with associative arrays
@ 1998-12-16 14:31 Sven Wischnowsky
0 siblings, 0 replies; 4+ messages in thread
From: Sven Wischnowsky @ 1998-12-16 14:31 UTC (permalink / raw)
To: zsh-workers
And this time it's for real:
% typeset -A a
% a[x*]=foo
zsh: bad math expression: unbalanced stack
% echo $a[x*]
foo
%
The problem is that isident() uses mathevalarg() to skip (!) over the
contents of a subscript (unless the subscript contains flags).
I don't have the time to fix this now since our LAN will soon be
upgraded but if noone else gives it a try I'll have a lokk at it.
Bye
Sven
--
Sven Wischnowsky wischnow@informatik.hu-berlin.de
^ permalink raw reply [flat|nested] 4+ messages in thread
* Problem with associative arrays
@ 1998-12-14 10:55 Sven Wischnowsky
1998-12-14 15:47 ` Bart Schaefer
0 siblings, 1 reply; 4+ messages in thread
From: Sven Wischnowsky @ 1998-12-14 10:55 UTC (permalink / raw)
To: zsh-workers
Hello
Subscripts for associative arrays are matheval()ed which makes some
problems:
% set -A a
% a[foo]=bar
% echo $a[baz]
bar
There is no variable baz, so evaluating it yields zero and since
numeric subscripts on associative arrays work, this yields the `first'
value.
% a[x*]=frob
zsh: bad math expression: unbalanced stack
zsh: bad math expression: unbalanced stack
Yes, `x*' is an invalid math expression, but...
Bye
Sven
--
Sven Wischnowsky wischnow@informatik.hu-berlin.de
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Problem with associative arrays
1998-12-14 10:55 Sven Wischnowsky
@ 1998-12-14 15:47 ` Bart Schaefer
0 siblings, 0 replies; 4+ messages in thread
From: Bart Schaefer @ 1998-12-14 15:47 UTC (permalink / raw)
To: Sven Wischnowsky, zsh-workers
On Dec 14, 11:55am, Sven Wischnowsky wrote:
} Subject: Problem with associative arrays
}
} Subscripts for associative arrays are matheval()ed
No, they are not. The code in params.c looks like
if (PM_TYPE(v->pm->flags) == PM_HASHED) {
...
} else
if (!(r = mathevalarg(s, &s)) || (isset(KSHARRAYS) && r >= 0))
...
} which makes some problems:
}
} % set -A a
You have to use `typeset -A a` to get an associative array. `set -A a`
creates an ordinary array. I realize this is confusing, which is why I
originally used a different option letter for typeset, but compatibility
with ksh requires -A.
} % a[foo]=bar
} % echo $a[baz]
} bar
}
} There is no variable baz, so evaluating it yields zero and since
} numeric subscripts on associative arrays work, this yields the `first'
} value.
This is all accurate, for ordinary arrays.
--
Bart Schaefer Brass Lantern Enterprises
http://www.well.com/user/barts http://www.brasslantern.com
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~1998-12-16 14:44 UTC | newest]
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1998-12-15 8:12 Problem with associative arrays Sven Wischnowsky
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1998-12-14 15:47 ` Bart Schaefer
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