Re: [TCLCORE] Variable substitution

[Andreas L. <av...@lo...>]

"Martin Lemburg" <mar...@gm...> wrote:
>  In some scripts I use data as "identifier" storing additional information about
>  this data in a variable, named using this data.  I don't build indexed variable
>  names, I simply use unique data, e.g. retrieved via http, as variable names.
>  I don't know, and I don't care about the string used as variable name ... 
>  as long tcl accepts them!
>  Limiting variable names e.g. to alphanumeric characters would destroy this "easy going".

This needs a quick explanation. 
My focus is not on variable names as such, but only about variable names
acceptable for $... or ${...} substitution.

Thus, unless you do (oh-so-wrong!) "eval handle \$$varName" style code,
you wouldn't even notice the change.

Variables names would still be allowed anything (with the 8.0+ caveat 
for ::, of course) but you'd *have to* use [set ugly\{\[varname] instead
of ${ugly{[varname}.   I'd dare to bet, you already do, with the arbitrary
varname probably stored in another, nicely-named var.  [set $varName]