111 lines
3.3 KiB
Scheme
111 lines
3.3 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 Output Ports
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;;; Package: (edwin buffer-output-port)
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(define (with-output-to-mark mark thunk)
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(call-with-output-mark mark
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(lambda (port)
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(parameterize ((current-output-port port))
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(thunk)))))
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(define (call-with-output-mark mark procedure)
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(let ((port (mark->output-port mark)))
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(let ((value (procedure port)))
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(operation/close port)
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value)))
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(define (mark->output-port mark #!optional buffer)
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(make-port mark-output-port-type
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(cons (mark-left-inserting-copy mark)
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(if (default-object? buffer)
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#f
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buffer))))
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(define (output-port->mark port)
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(mark-temporary-copy (port/mark port)))
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(define-integrable (port/mark port)
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(car (port/state port)))
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(define-integrable (port/buffer port)
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(cdr (port/state port)))
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(define (operation/flush-output port)
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(let ((mark (port/mark port))
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(buffer (port/buffer port)))
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(if buffer
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(for-each (if (mark= mark (buffer-point buffer))
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(lambda (window)
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(set-window-point! window mark)
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(window-direct-update! window #f))
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(lambda (window)
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(window-direct-update! window #f)))
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(buffer-windows buffer)))))
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(define (operation/write-self port output)
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(write-string " to buffer at " output)
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(write (port/mark port) output))
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(define (operation/write-char port char)
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(guarantee 8-bit-char? char)
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(region-insert-char! (port/mark port) char)
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1)
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(define (operation/write-substring port string start end)
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(if (string? string)
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(begin
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(region-insert-substring! (port/mark port) string start end)
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(fix:- end start))
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(generic-port-operation:write-substring port string start end)))
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(define (operation/line-start? port)
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(line-start? (port/mark port)))
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(define (operation/fresh-line port)
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(if (not (operation/line-start? port))
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(region-insert-newline! (port/mark port))))
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(define (operation/close port)
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(mark-temporary! (port/mark port)))
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(define (operation/x-size port)
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(mark-x-size (port/mark port)))
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(define mark-output-port-type
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(make-port-type `((CLOSE ,operation/close)
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(FLUSH-OUTPUT ,operation/flush-output)
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(FRESH-LINE ,operation/fresh-line)
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(LINE-START? ,operation/line-start?)
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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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