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    Length: 3041 (0xbe1)
    Types: TextFile
    Names: »comand.scm.19«

└─⟦a0efdde77⟧ Bits:30001252 EUUGD11 Tape, 1987 Spring Conference Helsinki
    └─ ⟦this⟧ »EUUGD11/gnu-31mar87/scheme/scm/comand.scm.19« 

TextFile

;;; -*-Scheme-*-
;;;
;;;	Copyright (c) 1984 Massachusetts Institute of Technology
;;;
;;;	This material was developed by the Scheme project at the
;;;	Massachusetts Institute of Technology, Department of
;;;	Electrical Engineering and Computer Science.  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. Users of this software agree to make their best efforts (a)
;;;	to return to the MIT Scheme project any improvements or
;;;	extensions that they make, so that these may be included in
;;;	future releases; and (b) to inform MIT of noteworthy uses of
;;;	this software.
;;;
;;;	3.  All materials developed as a consequence of the use of
;;;	this software shall duly acknowledge such use, in accordance
;;;	with the usual standards of acknowledging credit in academic
;;;	research.
;;;
;;;	4. MIT has made no warrantee or representation that the
;;;	operation of this software will be error-free, and MIT is
;;;	under no obligation to provide any services, by way of
;;;	maintenance, update, or otherwise.
;;;
;;;	5.  In conjunction with products arising from the use of this
;;;	material, there shall be no use of the name of the
;;;	Massachusetts Institute of Technology nor of any adaptation
;;;	thereof in any advertising, promotional, or sales literature
;;;	without prior written consent from MIT in each case.
;;;

;;;; Debugger Command Loop Support

(declare (usual-integrations))
\f


(define debugger-package
  (make-package debugger-package ()

(define (make-command-set name)
  (list name))

(define (define-letter-command command-set letter function help-text)
  (let ((new-command (ascii letter)))
    (let ((vcell (assq new-command (cdr command-set))))
      (if (null? vcell)
	  (let loop ((command-set command-set))
	    (if (disjunction (null? (cdr command-set))
			     (< new-command (caadr command-set)))
		(set-cdr! command-set
			  (cons (list new-command function help-text)
				(cdr command-set)))
		(loop (cdr command-set))))
	  (set-cdr! vcell (list function help-text))))))

(define (letter-commands command-set message prompt)
  (with-standard-proceed-point
   (lambda ()
     (push-command-loop message
			(named-lambda (do-letter-command state)
			  (prompt)
			  (let ((character (character-upcase (tyi))))
			    (let ((entry (assq character (cdr command-set))))
			      (if entry
				  (print ((cadr entry)))))))
			'()))))

(define ((standard-help-command command-set))
  (mapc (lambda (entry)
	  (newline) (princ "   ") (tyo (car entry))
	  (princ "   ") (princ (caddr entry)))
	(cdr command-set))
  *the-non-printing-object*)

(define (standard-exit-command)
  (proceed))

(define (environment-name environment)
  (lambda-components (procedure-lambda (environment-procedure environment))
    (lambda (name required optional rest auxiliary body)
      name)))

;;; end DEBUGGER-PACKAGE.
))