On Sun, Sep 9, 2012 at 6:52 PM, Matthew Flatt <mfl...@cs.utah.edu> wrote:
> Getting the line, column, and span for a rewriter result can be tricky.
> Usually, you want the result of a rewriter to have the same start and
> span as the input. I think I got that part right, below, too.
with-compound-rewriter has some smarts about how to insert lw structs
when it sees non-lws in the resulting list. So you can exploit that by
writing something like this (and thus avoid the need for "collapse"):
(define (dummy-rewriters thunk)
(with-compound-rewriters
(['n (lambda (lws)
(list ""
(list-ref lws 2)
(text (symbol->string (lw-e (list-ref lws 1)))
`(subscript . ,(default-style))
(default-font-size))
""))])
(thunk)))
I've added a note about this trick to the docs.
Robby
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