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92 lines
2.8 KiB
Scheme
92 lines
2.8 KiB
Scheme
; "repl.scm", read-eval-print-loop for Scheme
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; Copyright (c) 1993, Aubrey Jaffer
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;
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;Permission to copy this software, to redistribute it, and to use it
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;for any purpose is granted, subject to the following restrictions and
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;understandings.
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;
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;1. Any copy made of this software must include this copyright notice
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;in full.
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;
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;2. I have made no warrantee or representation that the operation of
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;this software will be error-free, and I am under no obligation to
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;provide any services, by way of maintenance, update, or otherwise.
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;
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;3. In conjunction with products arising from the use of this
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;material, there shall be no use of my name in any advertising,
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;promotional, or sales literature without prior written consent in
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;each case.
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(require 'dynamic-wind)
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(define (repl:quit) (slib:error "not in repl:repl"))
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(define (repl:top-level repl:eval)
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(repl:repl (lambda () (display "> ")
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(force-output (current-output-port))
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(read))
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repl:eval
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(lambda objs
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(cond ((null? objs))
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(else
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(write (car objs))
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(for-each (lambda (obj)
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(display " ;") (newline) (write obj))
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(cdr objs))))
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(newline))))
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(define (repl:repl repl:read repl:eval repl:print)
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(let* ((old-quit repl:quit)
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(old-error slib:error)
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(old-eval slib:eval)
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(old-load load)
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(repl:load (lambda (<pathname>)
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(call-with-input-file <pathname>
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(lambda (port)
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(let ((old-load-pathname *load-pathname*))
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(set! *load-pathname* <pathname>)
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(do ((o (read port) (read port)))
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((eof-object? o))
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(repl:eval o))
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(set! *load-pathname* old-load-pathname))))))
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(repl:restart #f)
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(values? (provided? 'values))
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(has-char-ready? (provided? 'char-ready?))
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(repl:error (lambda args (require 'debug) (apply qpn args)
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(repl:restart #f))))
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(dynamic-wind
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(lambda ()
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(set! load repl:load)
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(set! slib:eval repl:eval)
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(set! slib:error repl:error)
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(set! repl:quit
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(lambda () (let ((cont repl:restart))
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(set! repl:restart #f)
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(cont #t)))))
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(lambda ()
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(do () ((call-with-current-continuation
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(lambda (cont)
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(set! repl:restart cont)
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(do ((obj (repl:read) (repl:read)))
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((eof-object? obj) (repl:quit))
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(cond
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(has-char-ready?
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(let loop ()
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(cond ((char-ready?)
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(let ((c (peek-char)))
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(cond
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((eof-object? c))
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((char=? #\newline c) (read-char))
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((char-whitespace? c)
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(read-char) (loop))
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(else (newline)))))))))
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(if values?
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(call-with-values (lambda () (repl:eval obj))
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repl:print)
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(repl:print (repl:eval obj)))))))))
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(lambda () (cond (repl:restart
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(display ">>ERROR<<") (newline)
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(repl:restart #f)))
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(set! load old-load)
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(set! slib:eval old-eval)
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(set! slib:error old-error)
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(set! repl:quit old-quit)))))
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