Re: Splicing macro's & CGOL.

[George J. Carrette <GJC at MIT-MC>]

I have brought the Pratt parser for CGOL up on the lisp
machine. Therefore the question of how to introduce CGOL
syntax expressions comes up. I don't even want to mention
how it is done in maclisp.

Intuitively, what I want is a splicing macro. Let's say I
used sharp-sign-altmode to mean read in a sequence of cgol expressions.
However, splicing-macro's don't work at top-level, so I'll
tell you what I really need, a continuation macro.
I'll try to be exact here so that there is no confusion.

The toplevel READ nominally receives two arguments,
the STREAM to READ from, and a continuation to which to return.
If a continuation macro is read at top-level then what it
gets passed is the stream and the continuation.

(defun sharp-altcont (stream continuation)
       (DO ((FORM (CGOLREAD STREAM) (CGOLREAD STREAM)))
           ((EQUAL FORM '(EXIT)) NIL)
           (FUNCALL CONTINUATION FORM)))

To me the continuation passing makes a lot of sense for
any situation thats doing a READ-FROBULATE loop (actually MAPPING)
over a stream. Both COMPILE and LOAD could use it.

In the mean time I can make my splicing macro return a
"PROGN-QUOTE-COMPILE" when it needs to.