cc: [email protected]
Subject: Re: [ast-developers] Problems with "typeset -m" to move a
function-local variable into a function-local compound variable array of the
calling function...
--------
> While developing an application we hit a couple of problems with
> "typeset -m" (=move/rename variable). The basic idea is to create a
> variable locally and only move it into the (compound) variable array
> of the caller if certain conditions are met.
> The following testcase shows the problem:
> -- snip --
>
> function add_eval
> {
> nameref pos=$1
> source /dev/stdin <<<"$2"
> typeset -m pos=addvar
> return 0
> }
>
>
> function do_global_plain
> {
> print "# do global"
> add_eval global_tree[9].fish "typeset -i addvar=4"
>
> print -v global_tree
> return 0
> }
>
> function do_local_plain
> {
> print "# do local"
> compound -A local_tree
>
> add_eval local_tree[9].fish "typeset -i addvar=4"
>
> print -v local_tree
> return 0
> }
>
> function do_global_throughnameref
> {
> print "# do global_throughnameref"
> nameref tr=global_tree
> add_eval tr[9].fish "typeset -i addvar=4"
>
> print -v tr
> return 0
> }
>
> function do_local_throughnameref
> {
> print "# do local_throughnameref"
> compound -A local_tree
> nameref tr=local_tree
>
> add_eval tr[9].fish "typeset -i addvar=4"
>
> print -v tr
> return 0
> }
>
> compound -A global_tree
> do_global_plain "$@"
> do_local_plain "$@"
>
> unset global_tree
> compound -A global_tree
> do_global_throughnameref "$@"
> do_local_throughnameref "$@"
> -- snip --
>
> ast-ksh.2011-02-08 prints this:
> -- snip --
> $ ksh93 ../m1.sh
> # do global
> (
> [9]=(
> fish=4
> )
> )
> # do local
> (
> )
> # do global_throughnameref
> (
> )
> # do local_throughnameref
> (
> )
> -- snip --
> ... but AFAIK it should print the following output four times:
> -- snip --
> (
> [9]=(
> typeset -i fish=4
> )
> )
> -- snip --
>
> ----
>
> Bye,
> Roland
>
This is fixed for the next update. However, do local output the following:
# do local
(
[9]=(
)
)
I am still investigating why. However, when it goes to execute
typeset -m pos=addvar
the function do_local_plain scope is not visible.
All the others give the output you expected.
David Korn
[email protected]
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