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; "repl.scm", read-eval-print-loop for Scheme
; Copyright (c) 1993, Aubrey Jaffer
;
;Permission to copy this software, to modify it, to redistribute it,
;to distribute modified versions, 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.
(require 'dynamic-wind)
(define (repl:quit) (slib:error "not in repl:repl"))
(define (repl:top-level repl:eval)
(repl:repl (lambda () (display "> ")
(force-output (current-output-port))
(read))
repl:eval
(lambda objs
(cond ((null? objs))
(else
(write (car objs))
(for-each (lambda (obj)
(display " ;") (newline) (write obj))
(cdr objs))))
(newline))))
(define (repl:repl repl:read repl:eval repl:print)
(let* ((old-quit repl:quit)
(old-error slib:error)
(old-eval slib:eval)
(old-load load)
(repl:load (lambda (<pathname>)
(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))
(repl:eval o))
(set! *load-pathname* old-load-pathname))))))
(repl:restart #f)
(values? (provided? 'values))
(has-char-ready? (provided? 'char-ready?))
(repl:error (lambda args (require 'debug) (apply qpn args)
(repl:restart #f))))
(dynamic-wind
(lambda ()
(set! load repl:load)
(set! slib:eval repl:eval)
(set! slib:error repl:error)
(set! repl:quit
(lambda () (let ((cont repl:restart))
(set! repl:restart #f)
(cont #t)))))
(lambda ()
(do () ((call-with-current-continuation
(lambda (cont)
(set! repl:restart cont)
(do ((obj (repl:read) (repl:read)))
((eof-object? obj) (repl:quit))
(cond
(has-char-ready?
(let loop ()
(cond ((char-ready?)
(let ((c (peek-char)))
(cond
((eof-object? c))
((char=? #\newline c) (read-char))
((char-whitespace? c)
(read-char) (loop))
(else (newline)))))))))
(if values?
(call-with-values (lambda () (repl:eval obj))
repl:print)
(repl:print (repl:eval obj)))))))))
(lambda () (cond (repl:restart
(display ">>ERROR<<") (newline)
(repl:restart #f)))
(set! load old-load)
(set! slib:eval old-eval)
(set! slib:error old-error)
(set! repl:quit old-quit)))))
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