On 03/20/2012 12:08 PM, Neil Van Dyke wrote:
In the below example, can file "library.rkt" be changed (without
splitting it up into two files), so that file "program.rkt" works
without change? Is using "racket/load" the only way to keep
"library.rkt" to one file like this?
Basically, you just need to make sure that my-syntax-util is defined in
both phase 0 and phase 1. You could put it in a module that you require
twice, but that's roughly equivalent to just defining it twice, once at
phase 0 and once at phase 1 using `begin-for-syntax':
#lang racket/base
(require (for-syntax racket/base))
(define-syntax begin-both
(syntax-rules ()
((_ e ...)
(begin
(begin-for-syntax e ...)
e ...))))
(begin-both
(define (my-syntax-util stx)
;; Pretend that "my-syntax-util" performs some big complicated
processing,
;; which is useful both in the implementation of "my-own-syntax" and
;; also directly by users of this library.
(quasisyntax/loc stx
(cons 'my-syntax-util-was-here #,stx))))
(define-syntax (my-own-syntax stx)
(syntax-case stx ()
((_ CONDITION VAL)
(quasisyntax/loc stx
(if CONDITION
#,(my-syntax-util (syntax VAL))
VAL)))))
(provide my-own-syntax
my-syntax-util)
--
Brian Mastenbrook
br...@mastenbrook.net
http://brian.mastenbrook.net/
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