268 lines
8.8 KiB
Scheme
268 lines
8.8 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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;;;; Text Commands
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(define-major-mode text fundamental "Text"
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"Major mode for editing english text."
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(lambda (buffer)
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(local-set-variable! syntax-table text-mode:syntax-table buffer)
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(standard-alternate-paragraph-style! buffer)
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(local-set-variable! local-abbrev-table
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(ref-variable text-mode-abbrev-table buffer)
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buffer)
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(event-distributor/invoke! (ref-variable text-mode-hook buffer) buffer)))
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(define-key 'text #\m-s 'center-line)
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(define text-mode:syntax-table (make-char-syntax-table))
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(set-char-syntax! text-mode:syntax-table #\" " ")
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(set-char-syntax! text-mode:syntax-table #\\ " ")
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(set-char-syntax! text-mode:syntax-table #\[ "(] ")
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(set-char-syntax! text-mode:syntax-table #\] ")[ ")
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(set-char-syntax! text-mode:syntax-table #\{ "(} ")
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(set-char-syntax! text-mode:syntax-table #\} "){ ")
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(set-char-syntax! text-mode:syntax-table #\' "w ")
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(define-variable text-mode-abbrev-table
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"Mode-specific abbrev table for Text mode.")
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(define-abbrev-table 'text-mode-abbrev-table '())
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(define-variable text-mode-hook
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"An event distributor that is invoked when entering Text mode."
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(make-event-distributor))
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(define (turn-on-auto-fill buffer)
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(enable-buffer-minor-mode! buffer (ref-mode-object auto-fill)))
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(define-command text-mode
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"Make the current mode be Text mode."
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()
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(lambda ()
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(set-current-major-mode! (ref-mode-object text))))
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(define-major-mode indented-text text "Indented-Text"
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"Like Text mode, but indents each line under previous non-blank line."
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(lambda (buffer)
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(define-variable-local-value! buffer
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(ref-variable-object indent-line-procedure)
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(ref-command indent-relative))))
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(define-command indented-text-mode
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"Make the current mode be Indented Text mode."
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()
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(lambda ()
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(set-current-major-mode! (ref-mode-object indented-text))))
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;;;; Words
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(define-command forward-word
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"Move one or more words forward."
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"p"
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(lambda (argument)
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(move-thing forward-word argument 'FAILURE)))
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(define-command backward-word
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"Move one or more words backward."
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"p"
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(lambda (argument)
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(move-thing backward-word argument 'FAILURE)))
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(define-command mark-word
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"Set mark one or more words from point."
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"p"
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(lambda (argument)
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(mark-thing forward-word argument 'FAILURE)))
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(define-command kill-word
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"Kill one or more words forward."
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"p"
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(lambda (argument)
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(kill-thing forward-word argument 'FAILURE)))
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(define-command backward-kill-word
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"Kill one or more words backward."
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"p"
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(lambda (argument)
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(kill-thing backward-word argument 'FAILURE)))
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(define-command transpose-words
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"Transpose the words before and after the cursor.
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With a positive argument it transposes the words before and after the
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cursor, moves right, and repeats the specified number of times,
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dragging the word to the left of the cursor right.
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With a negative argument, it transposes the two words to the left of
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the cursor, moves between them, and repeats the specified number of
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times, exactly undoing the positive argument form.
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With a zero argument, it transposes the words at point and mark."
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"p"
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(lambda (argument)
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(transpose-things forward-word argument)))
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(define (count-words-region region)
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(let ((end (region-end region)))
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(let loop ((start (region-start region)) (count 0))
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(let ((start (forward-to-word start 'LIMIT)))
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(if (mark< start end)
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(let ((count (+ count 1))
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(m (forward-word start 1 #f)))
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(if m
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(loop m count)
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count))
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count)))))
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;;;; Case Conversion
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(define-command upcase-region
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"Convert the region to upper case."
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"r"
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(lambda (region) (upcase-region region)))
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(define-command downcase-region
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"Convert the region to lower case."
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"r"
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(lambda (region) (downcase-region region)))
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(define-command capitalize-region
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"Convert the region to capitalized form.
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Capitalized form means each word's first character is upper case
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and the rest of it is lower case."
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"r"
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(lambda (region) (capitalize-region region)))
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(define-command upcase-word
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"Convert following word (or ARG words) to upper case, moving over.
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With negative argument, convert previous words but do not move.
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See also `capitalize-word'."
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"p"
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(lambda (argument) (case-word-command upcase-region argument)))
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(define-command downcase-word
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"Convert following word (or ARG words) to lower case, moving over.
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With negative argument, convert previous words but do not move."
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"p"
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(lambda (argument) (case-word-command downcase-region argument)))
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(define-command capitalize-word
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"Capitalize the following word (or ARG words), moving over.
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This gives the word(s) a first character in upper case
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and the rest lower case.
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With negative argument, capitalize previous words but do not move."
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"p"
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(lambda (argument) (case-word-command capitalize-region argument)))
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(define (case-word-command procedure argument)
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(let* ((point (current-point))
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(end (forward-word point argument 'ERROR)))
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(procedure (make-region point end))
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(if (positive? argument) (set-current-point! end))))
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(define (downcase-region region)
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(region-transform! region string-downcase))
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(define (upcase-region region)
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(region-transform! region string-upcase))
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(define (capitalize-region region)
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(let ((end (region-end region)))
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(let loop ((start (region-start region)))
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(let ((start (forward-to-word start 'LIMIT)))
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(if (mark< start end)
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(let ((m (forward-word start 1 #f)))
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(if m
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(begin
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(region-transform! (make-region start m)
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string-capitalize)
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(loop m))
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(region-transform! (make-region start end)
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string-capitalize))))))))
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;;;; Sentences
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(define-command forward-sentence
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"Move forward to next sentence-end. With argument, repeat.
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With negative argument, move backward repeatedly to sentence-beginning.
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Sentence ends are identified by the value of Sentence End
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treated as a regular expression. Also, every paragraph boundary
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terminates sentences as well."
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"p"
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(lambda (argument)
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(move-thing forward-sentence argument 'ERROR)))
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(define-command backward-sentence
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"Move backward to start of sentence. With arg, do it arg times.
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See \\[forward-sentence] for more information."
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"p"
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(lambda (argument)
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(move-thing backward-sentence argument 'ERROR)))
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(define-command kill-sentence
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"Kill from point to end of sentence.
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With arg, repeat, or backward if negative arg."
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"p"
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(lambda (argument)
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(kill-thing forward-sentence argument 'ERROR)))
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(define-command backward-kill-sentence
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"Kill back from point to start of sentence.
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With arg, repeat, or forward if negative arg."
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"p"
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(lambda (argument)
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(kill-thing backward-sentence argument 'ERROR)))
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;;;; Paragraphs
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(define-command forward-paragraph
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"Move forward to end of paragraph. With arg, do it arg times.
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A line which `paragraph-start' matches either separates paragraphs
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\(if `paragraph-separate' matches it also) or is the first line of a paragraph.
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A paragraph end is the beginning of a line which is not part of the paragraph
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to which the end of the previous line belongs, or the end of the buffer."
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"p"
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(lambda (argument)
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(move-thing forward-paragraph argument 'ERROR)))
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(define-command backward-paragraph
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"Move backward to start of paragraph. With arg, do it arg times.
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A paragraph start is the beginning of a line which is a first-line-of-paragraph
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or which is ordinary text and follows a paragraph-separating line; except:
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if the first real line of a paragraph is preceded by a blank line,
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the paragraph starts at that blank line.
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See forward-paragraph for more information."
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"p"
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(lambda (argument)
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(move-thing backward-paragraph argument 'ERROR)))
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(define-command mark-paragraph
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"Put point at beginning of this paragraph, mark at end."
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()
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(lambda ()
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(let ((end (forward-paragraph (current-point) 1 'ERROR)))
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(set-current-region!
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(make-region (backward-paragraph end 1 'ERROR) end)))))
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