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386 lines
14 KiB
EmacsLisp
386 lines
14 KiB
EmacsLisp
;;; paragraphs.el --- paragraph and sentence parsing.
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;; Copyright (C) 1985, 86, 87, 91, 94, 95 Free Software Foundation, Inc.
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;; Maintainer: FSF
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;; Keywords: wp
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;; This file is part of GNU Emacs.
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;; GNU Emacs 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, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU 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 GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; This package provides the paragraph-oriented commands documented in the
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;; Emacs manual.
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;;; Code:
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(defvar use-hard-newlines nil
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"Non-nil means to distinguish hard and soft newlines.
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See documentation for the `use-hard-newlines' function.")
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(make-variable-buffer-local 'use-hard-newlines)
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(defun use-hard-newlines (&optional arg insert)
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"Minor mode to distinguish hard and soft newlines.
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When active, the functions `newline' and `open-line' add the
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text-property `hard' to newlines that they insert, and a line is
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only considered as a candidate to match `paragraph-start' or
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`paragraph-separate' if it follows a hard newline.
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Prefix argument says to turn mode on if positive, off if negative.
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When the mode is turned on, if there are newlines in the buffer but no hard
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newlines, ask the user whether to mark as hard any newlines preceeding a
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`paragraph-start' line. From a program, second arg INSERT specifies whether
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to do this; it can be `never' to change nothing, t or `always' to force
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marking, `guess' to try to do the right thing with no questions, nil
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or anything else to ask the user.
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Newlines not marked hard are called \"soft\", and are always internal
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to paragraphs. The fill functions insert and delete only soft newlines."
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(interactive (list current-prefix-arg nil))
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(if (or (<= (prefix-numeric-value arg) 0)
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(and use-hard-newlines (null arg)))
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;; Turn mode off
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(setq use-hard-newlines nil)
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;; Turn mode on
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;; Intuit hard newlines --
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;; mark as hard any newlines preceding a paragraph-start line.
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(if (or (eq insert t) (eq insert 'always)
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(and (not (eq 'never insert))
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(not use-hard-newlines)
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(not (text-property-any (point-min) (point-max) 'hard t))
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(save-excursion
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(goto-char (point-min))
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(search-forward "\n" nil t))
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(or (eq insert 'guess)
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(y-or-n-p "Make newlines between paragraphs hard? "))))
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(save-excursion
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(goto-char (point-min))
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(while (search-forward "\n" nil t)
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(let ((pos (point)))
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(move-to-left-margin)
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(if (looking-at paragraph-start)
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(progn
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(set-hard-newline-properties (1- pos) pos)
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;; If paragraph-separate, newline after it is hard too.
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(if (looking-at paragraph-separate)
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(progn
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(end-of-line)
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(if (not (eobp))
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(set-hard-newline-properties
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(point) (1+ (point))))))))))))
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(setq use-hard-newlines t)))
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(defconst paragraph-start "[ \t\n\f]" "\
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*Regexp for beginning of a line that starts OR separates paragraphs.
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This regexp should match lines that separate paragraphs
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and should also match lines that start a paragraph
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\(and are part of that paragraph).
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This is matched against the text at the left margin, which is not necessarily
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the beginning of the line, so it should never use \"^\" as an anchor. This
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ensures that the paragraph functions will work equally well within a region
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of text indented by a margin setting.
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The variable `paragraph-separate' specifies how to distinguish
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lines that start paragraphs from lines that separate them.
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If the variable `use-hard-newlines' is nonnil, then only lines following a
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hard newline are considered to match.")
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;; paragraph-start requires a hard newline, but paragraph-separate does not:
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;; It is assumed that paragraph-separate is distinctive enough to be believed
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;; whenever it occurs, while it is reasonable to set paragraph-start to
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;; something very minimal, even including "." (which makes every hard newline
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;; start a new paragraph).
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(defconst paragraph-separate "[ \t\f]*$" "\
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*Regexp for beginning of a line that separates paragraphs.
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If you change this, you may have to change paragraph-start also.
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This is matched against the text at the left margin, which is not necessarily
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the beginning of the line, so it should not use \"^\" as an anchor. This
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ensures that the paragraph functions will work equally within a region of
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text indented by a margin setting.")
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(defconst sentence-end (purecopy "[.?!][]\"')}]*\\($\\| $\\|\t\\| \\)[ \t\n]*") "\
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*Regexp describing the end of a sentence.
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All paragraph boundaries also end sentences, regardless.
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In order to be recognized as the end of a sentence, the ending period,
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question mark, or exclamation point must be followed by two spaces,
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unless it's inside some sort of quotes or parenthesis.")
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(defconst page-delimiter "^\014" "\
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*Regexp describing line-beginnings that separate pages.")
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(defvar paragraph-ignore-fill-prefix nil "\
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Non-nil means the paragraph commands are not affected by `fill-prefix'.
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This is desirable in modes where blank lines are the paragraph delimiters.")
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(defun forward-paragraph (&optional arg)
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"Move forward to end of paragraph.
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With arg N, do it N times; negative arg -N means move backward N paragraphs.
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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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(interactive "p")
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(or arg (setq arg 1))
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(let* ((fill-prefix-regexp
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(and fill-prefix (not (equal fill-prefix ""))
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(not paragraph-ignore-fill-prefix)
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(regexp-quote fill-prefix)))
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;; Remove ^ from paragraph-start and paragraph-sep if they are there.
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;; These regexps shouldn't be anchored, because we look for them
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;; starting at the left-margin. This allows paragraph commands to
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;; work normally with indented text.
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;; This hack will not find problem cases like "whatever\\|^something".
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(paragraph-start (if (and (not (equal "" paragraph-start))
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(equal ?^ (aref paragraph-start 0)))
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(substring paragraph-start 1)
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paragraph-start))
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(paragraph-separate (if (and (not (equal "" paragraph-start))
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(equal ?^ (aref paragraph-separate 0)))
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(substring paragraph-separate 1)
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paragraph-separate))
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(paragraph-separate
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(if fill-prefix-regexp
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(concat paragraph-separate "\\|"
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fill-prefix-regexp "[ \t]*$")
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paragraph-separate))
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;; This is used for searching.
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(sp-paragraph-start (concat "^[ \t]*\\(" paragraph-start "\\)"))
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start)
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(while (and (< arg 0) (not (bobp)))
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(if (and (not (looking-at paragraph-separate))
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(re-search-backward "^\n" (max (1- (point)) (point-min)) t)
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(looking-at paragraph-separate))
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nil
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(setq start (point))
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;; Move back over paragraph-separating lines.
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(forward-char -1) (beginning-of-line)
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(while (and (not (bobp))
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(progn (move-to-left-margin)
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(looking-at paragraph-separate)))
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(forward-line -1))
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(if (bobp)
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nil
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;; Go to end of the previous (non-separating) line.
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(end-of-line)
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;; Search back for line that starts or separates paragraphs.
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(if (if fill-prefix-regexp
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;; There is a fill prefix; it overrides paragraph-start.
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(let (multiple-lines)
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(while (and (progn (beginning-of-line) (not (bobp)))
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(progn (move-to-left-margin)
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(not (looking-at paragraph-separate)))
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(looking-at fill-prefix-regexp))
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(if (not (= (point) start))
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(setq multiple-lines t))
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(forward-line -1))
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(move-to-left-margin)
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;; Don't move back over a line before the paragraph
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;; which doesn't start with fill-prefix
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;; unless that is the only line we've moved over.
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(and (not (looking-at fill-prefix-regexp))
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multiple-lines
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(forward-line 1))
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(not (bobp)))
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(while (and (re-search-backward sp-paragraph-start nil 1)
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;; Found a candidate, but need to check if it is a
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;; REAL paragraph-start.
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(not (bobp))
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(progn (setq start (point))
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(move-to-left-margin)
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(not (looking-at paragraph-separate)))
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(or (not (looking-at paragraph-start))
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(and use-hard-newlines
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(not (get-text-property (1- start)
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'hard)))))
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(goto-char start))
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(> (point) (point-min)))
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;; Found one.
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(progn
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;; Move forward over paragraph separators.
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;; We know this cannot reach the place we started
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;; because we know we moved back over a non-separator.
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(while (and (not (eobp))
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(progn (move-to-left-margin)
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(looking-at paragraph-separate)))
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(forward-line 1))
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;; If line before paragraph is just margin, back up to there.
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(end-of-line 0)
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(if (> (current-column) (current-left-margin))
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(forward-char 1)
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(skip-chars-backward " \t")
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(if (not (bolp))
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(forward-line 1))))
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;; No starter or separator line => use buffer beg.
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(goto-char (point-min)))))
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(setq arg (1+ arg)))
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(while (and (> arg 0) (not (eobp)))
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;; Move forward over separator lines, and one more line.
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(while (prog1 (and (not (eobp))
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(progn (move-to-left-margin) (not (eobp)))
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(looking-at paragraph-separate))
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(forward-line 1)))
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(if fill-prefix-regexp
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;; There is a fill prefix; it overrides paragraph-start.
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(while (and (not (eobp))
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(progn (move-to-left-margin) (not (eobp)))
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(not (looking-at paragraph-separate))
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(looking-at fill-prefix-regexp))
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(forward-line 1))
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(while (and (re-search-forward sp-paragraph-start nil 1)
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(progn (setq start (match-beginning 0))
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(goto-char start)
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(not (eobp)))
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(progn (move-to-left-margin)
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(not (looking-at paragraph-separate)))
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(or (not (looking-at paragraph-start))
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(and use-hard-newlines
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(not (get-text-property (1- start) 'hard)))))
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(forward-char 1))
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(if (< (point) (point-max))
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(goto-char start)))
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(setq arg (1- arg)))))
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(defun backward-paragraph (&optional arg)
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"Move backward to start of paragraph.
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With arg N, do it N times; negative arg -N means move forward N paragraphs.
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A paragraph start is the beginning of a line which is a
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`first-line-of-paragraph' or which is ordinary text and follows a
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paragraph-separating line; except: if the first real line of a
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paragraph is preceded by a blank line, the paragraph starts at that
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blank line.
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See `forward-paragraph' for more information."
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(interactive "p")
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(or arg (setq arg 1))
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(forward-paragraph (- arg)))
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(defun mark-paragraph ()
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"Put point at beginning of this paragraph, mark at end.
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The paragraph marked is the one that contains point or follows point."
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(interactive)
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(forward-paragraph 1)
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(push-mark nil t t)
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(backward-paragraph 1))
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(defun kill-paragraph (arg)
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"Kill forward to end of paragraph.
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With arg N, kill forward to Nth end of paragraph;
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negative arg -N means kill backward to Nth start of paragraph."
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(interactive "p")
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(kill-region (point) (progn (forward-paragraph arg) (point))))
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(defun backward-kill-paragraph (arg)
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"Kill back to start of paragraph.
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With arg N, kill back to Nth start of paragraph;
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negative arg -N means kill forward to Nth end of paragraph."
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(interactive "p")
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(kill-region (point) (progn (backward-paragraph arg) (point))))
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(defun transpose-paragraphs (arg)
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"Interchange this (or next) paragraph with previous one."
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(interactive "*p")
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(transpose-subr 'forward-paragraph arg))
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(defun start-of-paragraph-text ()
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(let ((opoint (point)) npoint)
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(forward-paragraph -1)
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(setq npoint (point))
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(skip-chars-forward " \t\n")
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;; If the range of blank lines found spans the original start point,
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;; try again from the beginning of it.
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;; Must be careful to avoid infinite loop
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;; when following a single return at start of buffer.
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(if (and (>= (point) opoint) (< npoint opoint))
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(progn
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(goto-char npoint)
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(if (> npoint (point-min))
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(start-of-paragraph-text))))))
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(defun end-of-paragraph-text ()
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(let ((opoint (point)))
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(forward-paragraph 1)
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(if (eq (preceding-char) ?\n) (forward-char -1))
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(if (<= (point) opoint)
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(progn
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(forward-char 1)
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(if (< (point) (point-max))
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(end-of-paragraph-text))))))
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(defun forward-sentence (&optional arg)
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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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The variable `sentence-end' is a regular expression that matches ends of
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sentences. Also, every paragraph boundary terminates sentences as well."
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(interactive "p")
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(or arg (setq arg 1))
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(while (< arg 0)
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(let ((par-beg (save-excursion (start-of-paragraph-text) (point))))
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(if (re-search-backward (concat sentence-end "[^ \t\n]") par-beg t)
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(goto-char (1- (match-end 0)))
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(goto-char par-beg)))
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(setq arg (1+ arg)))
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(while (> arg 0)
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(let ((par-end (save-excursion (end-of-paragraph-text) (point))))
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(if (re-search-forward sentence-end par-end t)
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(skip-chars-backward " \t\n")
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(goto-char par-end)))
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(setq arg (1- arg))))
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(defun backward-sentence (&optional arg)
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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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(interactive "p")
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(or arg (setq arg 1))
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(forward-sentence (- arg)))
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(defun kill-sentence (&optional arg)
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"Kill from point to end of sentence.
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With arg, repeat; negative arg -N means kill back to Nth start of sentence."
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(interactive "p")
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(kill-region (point) (progn (forward-sentence arg) (point))))
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(defun backward-kill-sentence (&optional arg)
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"Kill back from point to start of sentence.
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With arg, repeat, or kill forward to Nth end of sentence if negative arg -N."
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(interactive "p")
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(kill-region (point) (progn (backward-sentence arg) (point))))
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(defun mark-end-of-sentence (arg)
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"Put mark at end of sentence. Arg works as in `forward-sentence'."
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(interactive "p")
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(push-mark
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(save-excursion
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(forward-sentence arg)
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(point))
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nil t))
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(defun transpose-sentences (arg)
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"Interchange this (next) and previous sentence."
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(interactive "*p")
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(transpose-subr 'forward-sentence arg))
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;;; paragraphs.el ends here
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