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    Length: 2598 (0xa26)
    Types: TextFile
    Names: »explode.scm.3«

└─⟦a0efdde77⟧ Bits:30001252 EUUGD11 Tape, 1987 Spring Conference Helsinki
    └─⟦this⟧ »EUUGD11/gnu-31mar87/scheme/scm/explode.scm.3« 

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.
;;;

;;;; MacLisp Style Print-name Stuff

(declare (usual-integrations))
\f


(define alphaless?)
(define explode)
(define implode)
(define char)
(define ascii)

(let ()
  (define (stringify name object)
    (cond ((symbol? object)
	   (symbol-print-name object))
	  ((string? object)
	   object)
	  (else
	   (error "Wrong type argument" name object))))

(set! alphaless?
      (named-lambda (alphaless? x y)
	(string-less? (stringify 'ALPHALESS? x)
		      (stringify 'ALPHALESS? y))))

(set! explode
      (named-lambda (explode symbol)
	(mapcar char (string->list (stringify 'EXPLODE symbol)))))

(set! implode
      (named-lambda (implode characters)
	(make-interned-symbol (list->string (mapcar ascii characters)))))

(set! char
      (named-lambda (char n)
	(make-interned-symbol (list->string (list n)))))

(set! ascii
      (named-lambda (ascii s)
	(let ((name (stringify 'ASCII s)))
	  (if (= (string-size name) 1)
	      (string-ref name 0)
	      (error "Not a character" 'ASCII s)))))
)

(define (readch) (char (tyi)))
(define (peekch) (char (tyipeek)))