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#| misc.jl -- miscellaneous scheme support
$Id: misc.jl,v 1.14 2001/08/08 06:00:23 jsh Exp $
Copyright (C) 2000 John Harper <john@dcs.warwick.ac.uk>
This file is part of librep.
librep is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
librep is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Jade; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
|#
(define-structure scheme.misc
(export procedure? apply map for-each force
\#make-promise call-with-current-continuation
call/cc dynamic-wind eval
scheme-report-environment null-environment
interaction-environment
call-with-input-file call-with-output-file
input-port? output-port? current-input-port
current-output-port with-input-from-file
with-output-to-file open-input-file
open-output-file close-input-port
close-output-port
read read-char peek-char eof-object?
write display newline write-char
load %load-suffixes)
((open rep
scheme.utils
rep.io.files
rep.data.datums)
(access rep.io.streams))
;;; control features
(define procedure? (make-predicate functionp))
(define (map proc . lists)
(if (null (cdr lists))
(mapcar proc (car lists))
(let loop ((out nil)
(in lists))
(if (car in)
(loop (cons (apply proc (mapcar car in)) out)
(mapcar cdr in))
(nreverse out)))))
(define (for-each proc . lists)
(if (null (cdr lists))
(mapc proc (car lists))
(let loop ((in lists))
(when (car in)
(apply proc (mapcar car in))
(loop (mapcar cdr in))))))
(define (force promise) (promise))
(define (\#make-promise thunk)
(let ((result-ready nil)
result)
(lambda ()
(unless result-ready
(let ((x (thunk)))
(unless result-ready
(setq result-ready t)
(setq result x))))
result)))
(define (eval form . env)
(declare (unused env))
(rep#eval form))
;; XXX support these (and in the above)
(define (scheme-report-environment version)
(declare (unused version))
#f)
(define (null-environment version)
(declare (unused version))
#f)
(define (interaction-environment) #f)
;;; input and output
(define (call-with-input-file name proc)
(let ((file (open-input-file name)))
(prog1
(proc file)
(close-file file))))
(define (call-with-output-file name proc)
(let ((file (open-output-file name)))
(prog1
(proc file)
(close-file file))))
(define input-port? (make-predicate rep.io.streams#input-stream-p))
(define output-port? (make-predicate rep.io.streams#output-stream-p))
(define (current-input-port) standard-input)
(define (current-output-port) standard-output)
(define (with-input-from-file name thunk)
(let ((standard-input (open-input-file name)))
(prog1
(thunk)
(close-file standard-input))))
(define (with-output-to-file name thunk)
(let ((standard-output (open-output-file name)))
(prog1
(thunk)
(close-file standard-output))))
(define (open-input-file name) (open-file name 'read))
(define (open-output-file name) (open-file name 'write))
(define (close-input-port f)
(unless (and (filep f) (null (file-binding f)))
close-file))
(define close-output-port close-input-port)
;;; input
(define eof-object (make-datum nil 'scheme-eof-object))
(define-datum-printer 'scheme-eof-object
(lambda (x s)
(declare (unused x))
(rep.io.streams#write s "#<scheme-eof>")))
(define (read #!optional port)
(condition-case nil
(rep.io.streams#read port)
(end-of-stream eof-object)))
(define (read-char #!optional port)
(or (rep.io.streams#read-char (or port standard-input)) eof-object))
(define (peek-char #!optional port)
(or (rep.io.streams#peek-char (or port standard-input)) eof-object))
(define eof-object? (make-predicate (lambda (obj) (eq obj eof-object))))
;;; output
(define (write obj #!optional port)
(rep.io.streams#format (or port standard-output) "%S" obj))
(define (display obj #!optional port)
(rep.io.streams#format (or port standard-output) "%s" obj))
(define (newline #!optional port)
(rep.io.streams#write (or port standard-output) #\newline))
(define (write-char char #!optional port)
(rep.io.streams#write (or port standard-output) char))
;;; system interface
;; load-file doesn't search path or add suffixes. So it fits r5rs
(define load load-file)
(define %load-suffixes '(".scm" . ".scmc")))
|
