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;;; "scainit.scm" Syntax-case macros port to SLIB -*- Scheme -*-
;;; Copyright (C) 1992 R. Kent Dybvig
;;;
;;; Permission to copy this software, in whole or in part, to use this
;;; software for any lawful purpose, and to redistribute this software
;;; is granted subject to the restriction that all copies made of this
;;; software must include this copyright notice in full. This software
;;; is provided AS IS, with NO WARRANTY, EITHER EXPRESS OR IMPLIED,
;;; INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY
;;; OR FITNESS FOR ANY PARTICULAR PURPOSE. IN NO EVENT SHALL THE
;;; AUTHORS BE LIABLE FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES OF ANY
;;; NATURE WHATSOEVER.
;;; From: Harald Hanche-Olsen <hanche@imf.unit.no>
;;; compat.ss
;;; Robert Hieb & Kent Dybvig
;;; 92/06/18
(require 'common-list-functions) ;to pick up EVERY
(define syncase:andmap comlist:every)
; In Chez Scheme "(syncase:void)" returns an object that is ignored by the
; REP loop. It is returned whenever a "nonspecified" value is specified
; by the standard. The following should pick up an appropriate value.
(define syncase:void
(let ((syncase:void-object (if #f #f)))
(lambda () syncase:void-object)))
(define syncase:eval-hook slib:eval)
(define syncase:error-hook slib:error)
(define syncase:new-symbol-hook
(let ((c 0))
(lambda (string)
(set! c (+ c 1))
(string->symbol
(string-append string ":Sca" (number->string c))))))
(define syncase:put-global-definition-hook #f)
(define syncase:get-global-definition-hook #f)
(let ((*macros* '()))
(set! syncase:put-global-definition-hook
(lambda (symbol binding)
(let ((pair (assq symbol *macros*)))
(if pair
(set-cdr! pair binding)
(set! *macros* (cons (cons symbol binding) *macros*))))))
(set! syncase:get-global-definition-hook
(lambda (symbol)
(let ((pair (assq symbol *macros*)))
(and pair (cdr pair))))))
;;;! expand.pp requires list*
(define (syncase:list* . args)
(if (null? args)
'()
(let ((r (reverse args)))
(append (reverse (cdr r))
(car r) ; Last arg
'())))) ; Make sure the last arg is copied
(define syntax-error syncase:error-hook)
(define impl-error slib:error)
(define base:eval slib:eval)
(define syncase:eval base:eval)
(define macro:eval base:eval)
(define syncase:expand #f)
(define macro:expand #f)
(define (syncase:expand-install-hook expand)
(set! syncase:eval (lambda (x) (base:eval (expand x))))
(set! macro:eval syncase:eval)
(set! syncase:expand expand)
(set! macro:expand syncase:expand))
;;; We Need This for bootstrapping purposes:
(define (syncase:load <pathname>)
(slib:eval-load <pathname> syncase:eval))
(define macro:load syncase:load)
(define syncase:sanity-check #f)
;;; LOADING THE SYSTEM ITSELF:
(let ((here (lambda (file)
(in-vicinity (library-vicinity) file)))
(scmhere (lambda (file)
(in-vicinity (library-vicinity)
(string-append file (scheme-file-suffix))))))
(for-each (lambda (file) (slib:load (here file)))
'("scaoutp"
"scaglob"
"scaexpp"))
(syncase:expand-install-hook expand-syntax)
(syncase:load (here "scamacr"))
(set! syncase:sanity-check
(lambda ()
(syncase:load (scmhere "sca-exp"))
(syncase:expand-install-hook expand-syntax)
(syncase:load (scmhere "sca-macr")))))
(provide 'syntax-case)
(provide 'macro)
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