syntax parse link

[Stefan Israelsson Tampe <stefan.itampe@gmail.com>]

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Hi,

I would like to add a link to the syntax-parse repo from guile's home page.
I was told to try get
the rights to do this myself. If that doesn't work I will need help from
any of the maintainers
to make the linkage.

NEWS: for syntax parse

I have written a fresh module using syntax parse to do racket's for,
for/list, etc. interface.
And have also started to work with an implementation of racket's match. It
has indeed been
a pleasure to work with the syntax parse framework and these two examples
can be studied
to see syntax-parse in action. It has also been a test-bed and I found that
racket's syntax parse
is lacking with respect to mutual recursive syntax-classes. Hence I added a
sane support for
this feature. E.g.

First prepend the code by declarations e.g.

(define-syntax-class ...)
Here the declaration has to be rich enough to contain all of the interface
that is later used for the syntax-class.

(syntax-class-set! ...) (New)
Has the same format as define-syntax-class but modifies the old
syntax-class in such a way
that a new parser function is added. To do this the interfaces has to match
or else a helpful message
will be supplied.

Ergo the idea follows closely the define/set! method in scheme

The procedure is a little clunky due to the expressiveness of the
syntax-class macro but still straightforward
and the code is easy to debug.

Have fun
Stefan

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