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Sun Apr 26 09:59:19 CEST 2009

sharing data between macros

Problem: individual rpn-transformers should be able to tag words with
semantics just like the core transformer does.

One thing is to always pass the semantics macros environment around in
a hash table or so.  But i wonder if it isn't a lot simpler to
re-resort to paramters, in this case syntax parameters.

Maybe I should learn to take a hint and see the use of a literal 'name
symbol as exactly the problem I'm trying to solve.  The parser is
mainly about translating Forth code to simple s-expressions (in the
form of tagged atoms) so it is trivial to parse later _with_
information provided by the parsing words themselves.

(: abc 123 +) ->
((name abc) (lit 123) (apply +)) ->
(name abc ((lit 123) (apply +)))

Hmm.. i lost perspective a bit..  It looks like there's a very simple
and elegant solution hidden somewhere, but I can't find it.  The clue
seems to be "fold": there is a datastructure parsed up to a certain
point, how does the next token add to this?  A new slogan:

       Forth parsing = fold.

To be continued..



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