Added new statement:
with
private-defins
do
public-defns
done
The definitions in private-defns are made localised to the public-defns.
For example:
var x = 99;
with
var x = 2;
do
var y = x;
done
println x,y;
prints (99,2)
This is necessary in cases like:
var re = RE2 "some-regex";
fun f(x:string) => Match (re, ... x ... );
where we want re to be compiled once, so it cannot be put in f,
but the way it is written above re is in scope where f is, whereas it's
intended to be private to f. The solution is:
with
var re = RE2 "some-regex";
do
fun f(x:string) => Match (re, .. x .. );
done
The implementation is
class dymmy {
private pdef1; private pdef2; ...
public-defns
}
inherit dymmy;
where pdef1, pdef2, etc are the private defns.
As an artefact of this implementation private definitions in public-defns
won't be "exported" to the surrounding scope either. It's tempting to define
do .. done
as "with ; do .. done" however whilst this makes sense, it will not be the same
as a "do done" elsewhere, for example in:
var a = 1;
while a < 3 do
private var b = a;
println$ a;
++a;
done
println$ b;
it all works: b is in scope outside the loop. (maybe it shouldn't be!)
--
john skaller
[email protected]
http://felix-lang.org
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