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;;;"scheme48.init" Initialisation for SLIB for Scheme48 -*-scheme-*-
;;; Copyright (C) 1992, 1993, 1994, 1995, 1997 Aubrey Jaffer.
;
;Permission to copy this software, to redistribute it, and to use it
;for any purpose is granted, subject to the following restrictions and
;understandings.
;
;1. Any copy made of this software must include this copyright notice
;in full.
;
;2. I have made no warrantee or representation that the operation of
;this software will be error-free, and I am under no obligation to
;provide any services, by way of maintenance, update, or otherwise.
;
;3. In conjunction with products arising from the use of this
;material, there shall be no use of my name in any advertising,
;promotional, or sales literature without prior written consent in
;each case.
;;; If you know the magic incantation to make a "," command available
;;; as a scheme procedure, you can make a nifty slib function to do
;;; this (like `slib:dump' in "vscm.init"). But for now, type:
;;; make slib48
;;; (software-type) should be set to the generic operating system type.
;;; UNIX, VMS, MACOS, AMIGA and MS-DOS are supported.
(define (software-type) 'UNIX)
;;; (scheme-implementation-type) should return the name of the scheme
;;; implementation loading this file.
(define (scheme-implementation-type) 'Scheme48)
;;; (scheme-implementation-version) should return a string describing
;;; the version of the scheme implementation loading this file.
(define scheme-implementation-version
(cond ((= -86400 (modulo -2177452800 -86400))
(display "scheme48-0.36 has been superseded by")
(newline)
(display "ftp@ftp-swiss.ai.mit.edu:pub/s48/scheme48-0.46.tgz")
(newline)
(display "ftp://ftp-swiss.ai.mit.edu/pub/s48/scheme48-0.46.tgz")
(newline)
(lambda () "0.36"))
(else (lambda () "0.46"))))
;;; (implementation-vicinity) should be defined to be the pathname of
;;; the directory where any auxiliary files to your Scheme
;;; implementation reside.
;;; [ defined from the Makefile ]
;;; (library-vicinity) should be defined to be the pathname of the
;;; directory where files of Scheme library functions reside.
;;; [ defined from the Makefile ]
(define getenv s48-getenv)
(define system s48-system)
;;; (home-vicinity) should return the vicinity of the user's HOME
;;; directory, the directory which typically contains files which
;;; customize a computer environment for a user.
(define home-vicinity
(let ((home-path (getenv "HOME")))
(lambda () home-path)))
;;; *FEATURES* should be set to a list of symbols describing features
;;; of this implementation. See Template.scm for the list of feature
;;; names.
(define *features*
'(
source ;can load scheme source files
;(slib:load-source "filename")
; compiled ;can load compiled files
;(slib:load-compiled "filename")
rev4-report ;conforms to
ieee-p1178 ;conforms to
rev4-optional-procedures
multiarg/and-
multiarg-apply
rationalize
delay ;has delay and force
with-file
char-ready? ;has
values ;proposed multiple values
eval ;slib:eval is single argument eval.
dynamic-wind ;proposed dynamic-wind
full-continuation ;can return multiple times
macro ;R4RS appendix's DEFINE-SYNTAX
system ;posix (system <string>)
getenv ;posix (getenv <string>)
))
;;; (OUTPUT-PORT-WIDTH <port>)
(define (output-port-width . arg) 79)
;;; (OUTPUT-PORT-HEIGHT <port>)
(define (output-port-height . arg) 24)
;;; (CURRENT-ERROR-PORT)
(define current-error-port s48-current-error-port)
;;; (TMPNAM) makes a temporary file name.
(define tmpnam
(let ((cntr 100))
(lambda () (set! cntr (+ 1 cntr))
(let ((tmp (string-append "slib_" (number->string cntr))))
(if (file-exists? tmp) (tmpnam) tmp)))))
;;; (FILE-EXISTS? <string>)
(define (file-exists? f)
(call-with-current-continuation
(lambda (k)
(s48-with-handler
(lambda (condition decline)
(k #f))
(lambda ()
(close-input-port (open-input-file f))
#t)))))
;;; (DELETE-FILE <string>)
(define (delete-file file-name)
(s48-system (string-append "rm " file-name)))
;;; FORCE-OUTPUT flushes any pending output on optional arg output port
;;; use this definition if your system doesn't have such a procedure.
(define (force-output . arg)
(s48-force-output
(if (null? arg) (current-output-port) (car arg))))
;;; CHAR-CODE-LIMIT is one greater than the largest integer which can
;;; be returned by CHAR->INTEGER.
(define integer->char s48-ascii->char)
(define char->integer
(let ((char->integer char->integer)
(code0 (char->integer (integer->char 0))))
(lambda (char) (- (char->integer char) code0))))
(define char-code-limit 256)
;;; Workaround MODULO bug
(define modulo
(let ((modulo modulo))
(lambda (n1 n2)
(let ((ans (modulo n1 n2)))
(if (= ans n2) (- ans ans) ans)))))
;;; MOST-POSITIVE-FIXNUM is used in modular.scm
(define most-positive-fixnum #x1FFFFFFF)
;;; Return argument
(define (identity x) x)
;;; If your implementation provides eval, SLIB:EVAL is single argument
;;; eval using the top-level (user) environment.
(define slib:eval
(let ((eval eval)
(interaction-environment interaction-environment))
(lambda (form)
(eval form (interaction-environment)))))
;;; If your implementation provides R4RS macros:
(define macro:eval slib:eval)
(define (macro:load <pathname>)
(if (not (file-exists? <pathname>))
(set! <pathname> (string-append <pathname> (scheme-file-suffix))))
(load <pathname>))
(define *defmacros*
(list (cons 'defmacro
(lambda (name parms . body)
`(set! *defmacros* (cons (cons ',name (lambda ,parms ,@body))
*defmacros*))))))
(define (defmacro? m) (and (assq m *defmacros*) #t))
(define (macroexpand-1 e)
(if (pair? e) (let ((a (car e)))
(cond ((symbol? a) (set! a (assq a *defmacros*))
(if a (apply (cdr a) (cdr e)) e))
(else e)))
e))
(define (macroexpand e)
(if (pair? e) (let ((a (car e)))
(cond ((symbol? a)
(set! a (assq a *defmacros*))
(if a (macroexpand (apply (cdr a) (cdr e))) e))
(else e)))
e))
(define gentemp
(let ((*gensym-counter* -1))
(lambda ()
(set! *gensym-counter* (+ *gensym-counter* 1))
(string->symbol
(string-append "slib:G" (number->string *gensym-counter*))))))
(define base:eval slib:eval)
(define (defmacro:eval x) (base:eval (defmacro:expand* x)))
(define (defmacro:expand* x)
(require 'defmacroexpand) (apply defmacro:expand* x '()))
(define (defmacro:load <pathname>)
(slib:eval-load <pathname> defmacro:eval))
(define (slib:eval-load <pathname> evl)
(if (not (file-exists? <pathname>))
(set! <pathname> (string-append <pathname> (scheme-file-suffix))))
(call-with-input-file <pathname>
(lambda (port)
(let ((old-load-pathname *load-pathname*))
(set! *load-pathname* <pathname>)
(do ((o (read port) (read port)))
((eof-object? o))
(evl o))
(set! *load-pathname* old-load-pathname)))))
(define slib:warn
(lambda args
(let ((port (current-error-port)))
(display "Warn: " port)
(for-each (lambda (x) (display x port)) args))))
;;; define an error procedure for the library
(define slib:error s48-error)
;;; define these as appropriate for your system.
(define slib:tab (s48-ascii->char 9))
(define slib:form-feed (s48-ascii->char 12))
;;; Support for older versions of Scheme. Not enough code for its own file.
(define (last-pair l) (if (pair? (cdr l)) (last-pair (cdr l)) l))
(define t #t)
(define nil #f)
;;; Define these if your implementation's syntax can support them and if
;;; they are not already defined.
(define (1+ n) (+ n 1))
(define (-1+ n) (+ n -1))
;(define 1- -1+)
(define in-vicinity string-append)
;;; Define SLIB:EXIT to be the implementation procedure to exit or
;;; return if exitting not supported.
(define slib:exit (lambda args #f))
;;; Here for backward compatability
(define scheme-file-suffix
(case (software-type)
((NOSVE) (lambda () "_scm"))
(else (lambda () ".scm"))))
;;; (SLIB:LOAD-SOURCE "foo") should load "foo.scm" or with whatever
;;; suffix all the module files in SLIB have. See feature 'SOURCE.
(define (slib:load-source f) (load (string-append f (scheme-file-suffix))))
;;; (SLIB:LOAD-COMPILED "foo") should load the file that was produced
;;; by compiling "foo.scm" if this implementation can compile files.
;;; See feature 'COMPILED.
(define slib:load-compiled load)
;;; At this point SLIB:LOAD must be able to load SLIB files.
(define slib:load slib:load-source)
;;; Scheme48 complains that these are not defined (even though they
;;; won't be called until they are).
(define synclo:load #f)
(define syncase:load #f)
(define macwork:load #f)
(define transcript-on #f)
(define transcript-off #f)
(slib:load (in-vicinity (library-vicinity) "require"))
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