From: Jean-Hugues ROBERT <jean_hugues_robert@...>
Date: 2002-06-13T19:25:49+09:00
Subject: Re: ruby-dev summary 17252-17356



Hello,

about scope design,

Perhaps:
   xx do local xxx end
   xx do xxx end

after "local" a new scope rule starts applying.

For block parameters:
   xx.each do local |x| xxx end

For block variables:
x,y,z = 1,2,3
(Proc.new do
   x = 0     # outer x
   p x       # 0
   local     # new scope rule starts here
   x,y = 2,3 # outer x, local y
   p x,y,z   # 2,3,nil versus 2,3,3 without "local"
).call
p x,y,z   # 2,2,3 versus 2,3,3 without "local"


<storm>

Also (orthogonal): global
   xx do xxx global; xxx end
Ideally: unbound
     xxx do global; local; xxx end
eqv xxx do unbound; xxx end

Also: local but with initial values
   do local a,b,c |x| xxx end
where a,b,c are initialized with whatever value they
had before.

Also: local but initialized at block creation time:
   do unbound a,b |z| xxx end
a,b will be local but initialized with whatever value
they had when the block was created.

</storm>

Yours,

Jean-Hugues