Didn't you recently add the "as" syntax which would allow, for example:
if test1 as x1 do
elif test2 as x2 do
elif test3 as x3 do
done
?
This probably eliminates the nested else if 90% of the time without adding
to the language.
On Tue, Oct 9, 2012 at 7:28 PM, john skaller
<skal...@users.sourceforge.net>wrote:
> I have code like this:
>
> var x1 = test1;
> if x1 do
> ...
> else
> var x2 = test2;
> if x2 do
> ...
> else
> var x3 = test3;
> if x3 do
>
>
> The "elif" clause normally relieves this nesting problem,
> but doesn't work when you have to compute something
> prior to the next test. So I'm trying this:
>
> if x do
> ...
> otherwise
>
> blah;
> if x2 do
> ..
> otherwise
>
> "otherwise" is the same as "else" except scope extends to the end of
> the enclosing scope. Another way to do this is make "else" do what
> "otherwise" does and then add do/done:
>
> do
> if x do ..
> else ..
> done
>
> This is the Ocaml syntax (they use begin/end and if/then).
> Gets rid if "elif" since you can now write "else if".
>
> Ocaml generally open-scopes trailers like this:
> let .. in, match .. with, if ..else all work that way (but
> for loops don't).
>
> This makes some code more compact, but editing is a pain
> because you have to "back up" to put the "do/begin" at the top
> of a scope when you terminate it with "done/end", i.e. the
> Ocaml method is fragile.
>
> I note in passing ML uses let .. in .. endlet (i forget the actual
> terminator).
>
> C is similar:
>
> if (c) x;
> if (x) { x; y; }
>
> Fragile. But whilst Felix
>
> if x do x; done
>
> is robust it also leads to a lot of ugly "done"s at the end
> of nested blocks .. almost as bad as Lisp.
>
>
> --
> john skaller
> skal...@users.sourceforge.net
> http://felix-lang.org
>
>
>
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