Re: easy calling of associative array?

[ZyX <kp-pav@yandex.ru>]

02.11.2015, 22:03, "Ray Andrews" <rayandrews@eastlink.ca>:
> On 11/02/2015 08:28 AM, Bart Schaefer wrote:
>>  } #$3=${(P)${:-${1}[$2]}} #nothing works
>
> Pardon, that was an obvious mistake. Too much thrashing around with 'eval'.
>>  Same assignment-syntax problem.
>>
>>       set_v () {
>>         typeset -g "${1}[$2]=$3" # quotes so [ ] isn't globbing
>>       }
>>
>>  Here you don't need the (P) indirection because ${1} and $2 are both
>>  expanded before being passed to typeset, so you already extracted the
>>  name that was passed in $1.
>
> ... and that's nicely readable too--the sort of syntax that seems
> intuitive, as I
> mentioned. I won't say this is all clear in my mind, but it's
> at least tractable. One further question: I've never seen 'typeset'
> used to refer
> to anything but a simple variable. I note that the above does not work
> without
> the 'typeset -g' so what does that accomplish? I've never thought of the
> positional parameters and being typeset-able. I get the feeling it is a
> future
> problem solver.

Typeset variant has unresolved problems with `$2` escaping. Writing `${(q)2}` works here, but I have no idea why it works.

Note: when trying to use any of the functions, try with keys `abc]def` and `abc  def` (two spaces inside). First collects most of the errors.

>>  Also note I'm ignoring all possible error checking, e.g. if $1 is not
>>  an identifier (in the worst case, contains an "="), things go badly.
>
> Sure, it's naive at this point. I don't yet think past that.
>>  I'm not exactly sure what you're wanting as either output or exit
>>  status here, but except that I'd recommend [[ ]] instead of [ ] as
>>  the test syntax, what you wrote for "this works" is sensible.
>
> Ok. I don't pay enough attention to the difference.
>
> BTW, as a point of list etiquette: Responding to most posts I let my
> lines wrap
> but resonding to yours, which seem to alway have fixed line width, I try to
> match that style, but looking at the returned posts from the list, they
> sometimes
> sproing badly. Should I try to keep to your width, or just let lines wrap?
>>