96 lines
3.5 KiB
Scheme
96 lines
3.5 KiB
Scheme
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;;;
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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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;;;; Words
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(define (forward-word mark n limit?)
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(cond ((positive? n) (%forward-word mark n limit?))
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((negative? n) (%backward-word mark (- n) limit?))
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(else mark)))
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(define (%forward-word mark n limit?)
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(let ((end (group-end mark)))
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(define (loop mark n)
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(let ((m (find-next-word-constituent mark end #!FALSE)))
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(if (not m)
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(limit-mark-motion limit? mark)
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(let ((m (find-next-word-delimiter m end 'LIMIT)))
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(if (= n 1)
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m
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(loop m (-1+ n)))))))
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(loop mark n)))
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(define (backward-word mark n limit?)
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(cond ((positive? n) (%backward-word mark n limit?))
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((negative? n) (%forward-word mark (- n) limit?))
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(else mark)))
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(define (%backward-word mark n limit?)
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(let ((end (group-start mark)))
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(define (loop mark n)
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(let ((m (find-previous-word-constituent mark end #!FALSE)))
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(if (not m)
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(limit-mark-motion limit? mark)
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(let ((m (find-previous-word-delimiter m end 'LIMIT)))
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(if (= n 1)
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m
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(loop m (-1+ n)))))))
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(loop mark n)))
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(define (forward-to-word mark limit?)
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(find-next-word-constituent mark (mark-end mark) limit?))
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(define (find-next-word-constituent start end limit?)
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(or (find-next-char-in-set start end word-constituent-chars)
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(limit-mark-motion limit? end)))
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(define (find-previous-word-constituent start end limit?)
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(or (find-previous-char-in-set start end word-constituent-chars)
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(limit-mark-motion limit? end)))
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(define (find-next-word-delimiter start end limit?)
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(or (find-next-char-in-set start end word-delimiter-chars)
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(limit-mark-motion limit? end)))
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(define (find-previous-word-delimiter start end limit?)
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(or (find-previous-char-in-set start end word-delimiter-chars)
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(limit-mark-motion limit? end)))
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