Re: goto
On 16 Jul 2001, at 17:34, jbrown105 at hotpop.com wrote:
>
> Anyone have an idea of how to make a preprocessor to process gotos?
Well, for Eu, you have one big constraint as a preprocessor. The "goto" and
the :label will haveto be in the same block,, or be one block of it's own. They
will be restricted to the procedure or function they live in, no jumping into a
procedure or out of one. No overlapping goto blocks unless you want to do
some real fancy coding.
So,, with that in mind, locate the "goto" and it's :label, lift them out of
where
they are, drop them into a procedure of that name, passing all the vars used
between the goto and the :label. Then pass them all back if they are
changed, and reset them in the place you lifted the goto-:label from.
It's actually easier to do this in the source code. The C64 had "goto line
number". I added "goto :label", then i added "goto variable", then i was able
to place the target label anywhere, including in the middle of lines. Ditto with
gosubs. Basically, you see the goto, then search for the :label , unless
you've already seen it, then you simply resume execution there.
I would like to be able to goto out of any level of loop, to avoid multiple
exits.
Maybe you could do a case statement first, those will all be isolated
forwards jumps, and not overlapping, a easy thing to do with routine_id(). I
have like 600 irc server commands that are aching for a case, or a goto
variable.
Kat
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