83 lines
2.8 KiB
Scheme
83 lines
2.8 KiB
Scheme
;;;
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;;; Copyright (c) 1985 Massachusetts Institute of Technology
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;;;
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;;; This material was developed by the Scheme project at the
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;;; Massachusetts Institute of Technology, Department of
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;;; Electrical Engineering and Computer Science. Permission to
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;;; copy this software, to redistribute it, and to use it for any
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;;; 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
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;;; notice in full.
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;;;
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;;; 2. Users of this software agree to make their best efforts (a)
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;;; to return to the MIT Scheme project any improvements or
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;;; extensions that they make, so that these may be included in
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;;; future releases; and (b) to inform MIT of noteworthy uses of
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;;; this software.
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;;;
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;;; 3. All materials developed as a consequence of the use of
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;;; this software shall duly acknowledge such use, in accordance
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;;; with the usual standards of acknowledging credit in academic
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;;; research.
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;;;
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;;; 4. MIT has made no warrantee or representation that the
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;;; operation of this software will be error-free, and MIT is
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;;; under no obligation to provide any services, by way of
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;;; maintenance, update, or otherwise.
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;;;
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;;; 5. In conjunction with products arising from the use of this
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;;; material, there shall be no use of the name of the
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;;; Massachusetts Institute of Technology nor of any adaptation
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;;; thereof in any advertising, promotional, or sales literature
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;;; without prior written consent from MIT in each case.
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;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;
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;;; Modified by Texas Instruments Inc 8/15/85
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;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;; Character Sets macros
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(macro make-char-set
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(lambda (e)
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(list->string (cdr e))))
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(define (%loop code chars predicate)
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(if (< code 256)
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(let ((char (integer->char code)))
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(%loop (1+ code)
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(if (predicate char)
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(cons char chars)
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chars)
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predicate))
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chars))
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(macro predicate->char-set
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(lambda (e)
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(list->string (%loop 0 '() (eval (cadr e))))))
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(macro char-set-invert
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(lambda (e)
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(list->string (%loop 0 '()
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(lambda (char)
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(not (char-set-member? (eval (cadr e)) char)))))))
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(macro char-set-union
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(lambda (e)
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(list->string (%loop 0 '()
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(lambda (char)
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(or (char-set-member? (eval (cadr e)) char)
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(char-set-member? (eval (caddr e)) char)))))))
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(macro make-non-graphic-char-set
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(lambda (e)
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(let ((set (make-string 32 (integer->char 128))))
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(do ((i 0 (1+ i)))
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((= i 32) set)
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(string-set! set i (integer->char i))))))
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