154 lines
4.9 KiB
Scheme
154 lines
4.9 KiB
Scheme
#| -*-Scheme-*-
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Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
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1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
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2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016,
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2017, 2018, 2019, 2020 Massachusetts Institute of Technology
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This file is part of MIT/GNU Scheme.
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MIT/GNU Scheme is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at
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your option) any later version.
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MIT/GNU Scheme is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with MIT/GNU Scheme; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301,
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USA.
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|#
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;;;; Region/Mark Operations
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(define (region-insert! mark region)
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(let ((string (region->string region))
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(group (mark-group mark))
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(start (mark-index mark)))
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(let ((n (string-length string)))
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(group-insert-substring! group start string 0 n)
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(%make-region (make-temporary-mark group start false)
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(make-temporary-mark group (+ start n) true)))))
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(define (region-insert-string! mark string)
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(group-insert-substring! (mark-group mark) (mark-index mark)
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string 0 (string-length string)))
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(define (region-insert-substring! mark string start end)
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(group-insert-substring! (mark-group mark) (mark-index mark)
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string start end))
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(define (region-insert-newline! mark)
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(group-insert-char! (mark-group mark) (mark-index mark) #\newline))
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(define (region-insert-char! mark char)
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(group-insert-char! (mark-group mark) (mark-index mark) char))
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(define (region->string region)
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(group-extract-string (region-group region)
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(region-start-index region)
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(region-end-index region)))
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(define (region-delete! region)
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(group-delete! (region-group region)
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(region-start-index region)
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(region-end-index region)))
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(define (mark-left-char mark)
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(and (not (group-start? mark))
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(group-left-char (mark-group mark) (mark-index mark))))
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(define (mark-right-char mark)
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(and (not (group-end? mark))
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(group-right-char (mark-group mark) (mark-index mark))))
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(define (mark-delete-left-char! mark)
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(if (group-start? mark)
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(error "No left char:" mark))
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(group-delete-left-char! (mark-group mark) (mark-index mark)))
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(define (mark-delete-right-char! mark)
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(if (group-end? mark)
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(error "No right char:" mark))
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(group-delete-right-char! (mark-group mark) (mark-index mark)))
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(define (region-transform! region operation)
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(let ((start (region-start region)))
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(group-replace-string! (mark-group start)
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(mark-index start)
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(operation (region->string region)))))
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;;;; Clipping
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(define (group-narrow! group start end)
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(record-clipping! group start end)
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(%group-narrow! group start end))
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(define (%group-narrow! group start end)
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(let ((start (make-permanent-mark group start false))
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(end (make-permanent-mark group end true)))
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(set-group-start-mark! group start)
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(set-group-end-mark! group end)
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(set-group-display-start! group start)
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(set-group-display-end! group end)))
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(define (group-widen! group)
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(record-clipping! group 0 (group-length group))
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(%group-widen! group))
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(define (%group-widen! group)
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(%group-narrow! group 0 (group-length group)))
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(define (region-clip! region)
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(let ((group (region-group region))
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(start (region-start region))
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(end (region-end region)))
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(let ((point (group-point group)))
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(cond ((mark< point start) (set-group-point! group start))
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((mark> point end) (set-group-point! group end))))
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(let ((buffer (group-buffer group)))
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(if buffer
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(for-each
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(lambda (window)
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(let ((point (window-point window)))
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(cond ((mark< point start) (set-window-point! window start))
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((mark> point end) (set-window-point! window end)))))
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(buffer-windows buffer))))
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(group-narrow! group (mark-index start) (mark-index end))))
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(define (with-region-clipped! new-region thunk)
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(let ((group (region-group new-region))
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(old-region))
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(dynamic-wind (lambda ()
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(set! old-region (group-region group))
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(region-clip! new-region)
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(set! new-region)
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unspecific)
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thunk
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(lambda ()
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(region-clip! old-region)))))
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(define (without-group-clipped! group thunk)
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(let ((old-region))
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(dynamic-wind (lambda ()
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(set! old-region (group-region group))
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(group-widen! group))
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thunk
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(lambda ()
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(region-clip! old-region)))))
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(define (group-clipped? group)
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(not (and (zero? (group-start-index group))
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(= (group-end-index group) (group-length group)))))
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(define (group-unclipped-region group)
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(make-region (make-mark group 0)
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(make-mark group (group-length group))))
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