113 lines
4.0 KiB
Scheme
113 lines
4.0 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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;;;; Buffer I/O Ports
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;;; package: (edwin window-output-port)
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(define (with-output-to-current-point thunk)
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(with-output-to-window-point (current-window) thunk))
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(define (with-output-to-window-point window thunk)
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(parameterize ((current-output-port (window-output-port window)))
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(thunk)))
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(define (window-output-port window)
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(make-port window-output-port-type window))
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(define (operation/write-char port char)
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(guarantee 8-bit-char? char)
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(let ((window (port/state port)))
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(let ((buffer (window-buffer window))
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(point (window-point window)))
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(if (and (null? (cdr (buffer-windows buffer)))
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(line-end? point)
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(buffer-auto-save-modified? buffer)
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(or (not (window-needs-redisplay? window))
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(window-direct-update! window #f)))
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(cond ((and (group-end? point)
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(char=? char #\newline)
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(< (1+ (window-point-y window)) (window-y-size window)))
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(window-direct-output-insert-newline! window))
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((and (not (char=? char #\newline))
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(not (char=? char #\tab))
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(let ((image (window-char->image window char)))
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(and (= (string-length image) 1)
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(char=? (string-ref image 0) char)))
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;; above 3 expressions replace (char-graphic? char)
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(< (1+ (window-point-x window)) (window-x-size window)))
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(region-insert-char! point char)
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(window-direct-output-insert-char! window char))
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(else
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(region-insert-char! point char)))
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(region-insert-char! point char)))))
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(define (operation/write-substring port string start end)
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(if (string? string)
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(let ((window (port/state port)))
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(let ((buffer (window-buffer window))
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(point (window-point window)))
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(if (and (null? (cdr (buffer-windows buffer)))
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(line-end? point)
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(buffer-auto-save-modified? buffer)
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(or (not (window-needs-redisplay? window))
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(window-direct-update! window #f))
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(let loop ((i (- end 1)))
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(or (< i start)
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(let ((char (string-ref string i)))
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(and (not (char=? char #\newline))
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(not (char=? char #\tab))
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(let ((image (window-char->image window char)))
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(and (= (string-length image) 1)
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(char=? (string-ref image 0) char)
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(loop (- i 1))))))))
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(< (+ (- end start) (window-point-x window))
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(window-x-size window)))
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(window-direct-output-insert-substring! window string start end)
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(region-insert-substring! point string start end))))
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(generic-port-operation:write-substring port string start end)))
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(define (operation/flush-output port)
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(let ((window (port/state port)))
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(if (window-needs-redisplay? window)
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(window-direct-update! window #f))))
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(define (operation/x-size port)
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(window-x-size (port/state port)))
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(define (operation/write-self port output)
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(write-string " to window " output)
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(write (port/state port) output))
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(define window-output-port-type
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(make-port-type `((FLUSH-OUTPUT ,operation/flush-output)
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(WRITE-CHAR ,operation/write-char)
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(WRITE-SELF ,operation/write-self)
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(WRITE-SUBSTRING ,operation/write-substring)
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(X-SIZE ,operation/x-size))
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#f))
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