Re: And another crm114 script language question about 'isolate'

On Mon, Mar 31, 2008 at 03:08:35AM +0100, Ger Hobbelt wrote:
> ... Hi, it's me again.
> 
> CRM114 language appreciation is the thing.
> 
> Quick check, because I blew my rotoplooker while having it suck on this one:
> 
> 
> Scenario:
> 
> run crm114 with a few --var arguments on the command line.
> 
> 'Normally', I'd use a line like this to grab 'em each:
> 
>   isolate <default> (:var:) //
> 
> to make sure the :var: is always there for the remainder of the code,
> even when the commandline abuser didn't specify it.
> 
> 
> Q: are these incantations _intended_ to be exactly the same?
> 
>   isolate (:var:)
> 
> (Note the lack of /.../ there)
> 
> and
> 
>   isolate <default> (:var:) //

the 1st (re)defines / moves :var: into the isolation buffer, the latter does
the same and assign it a value IFF it's not already defined. Then

  isolate (:var:) //

does the same, regardless of previous existance of :var:.
So we have:

$ crm -{isolate (:var:)
	isolate (:var1:) //
	isolate <default> (:var2:) //
	output /var=:*:var:= var1=:*:var1:= var2=:*:var2:= var3=:*:var3:= \n/
	} --var=1 --var1=2 --var2=3
var=1= var1== var2=3= var3=:var3:=

$ crm -{isolate (:var:)
	isolate (:var1:) //
	isolate <default> (:var2:) //
	output /var=:*:var:= var1=:*:var1:= var2=:*:var2:= var3=:*:var3:= \n/
	} --var=1 --var1=2 --var2=3 --var3=4
var=1= var1== var2=3= var3=4=

which looks right to me.

Of course <default> should work for successive ISOLATE as well:

$ crm -{isolate (:var:)
	isolate (:var1:) //
        isolate <default> (:var2:) //
        isolate (:v:)
        isolate (:d:)
        isolate (:v:) /x/
        isolate  <default> (:d:) /x/
        output /var=:*:var:= var1=:*:var1:= var2=:*:var2:= var3=:*:var3:= /
	output /v=:*:v:= d=:*:d:=\n/
        } --var=1 --var1=2 --var2=3 --var3=4

var=1= var1== var2=3= var3=4= v=x= d==

note that :d: is not touched by last ISOLATE, which again looks right to me.



-- 
 paolo
 
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