;;; paragraphs.el --- paragraph and sentence parsing.
-;; Copyright (C) 1985, 86, 87, 91, 94 Free Software Foundation, Inc.
+;; Copyright (C) 1985, 86, 87, 91, 94, 95, 96, 1997
+;; Free Software Foundation, Inc.
;; Maintainer: FSF
;; Keywords: wp
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs; see the file COPYING. If not, write to
-;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+;; along with GNU Emacs; see the file COPYING. If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
;;; Commentary:
;;; Code:
-(defconst paragraph-start "^[ \t\n\f]" "\
+(defgroup paragraphs nil
+ "Paragraph and sentence parsing."
+ :group 'editing)
+
+;; It isn't useful to use defcustom for this variable
+;; because it is always buffer-local.
+(defvar use-hard-newlines nil
+ "Non-nil means to distinguish hard and soft newlines.
+See also the documentation for the function `use-hard-newlines'.")
+(make-variable-buffer-local 'use-hard-newlines)
+
+(defun use-hard-newlines (&optional arg insert)
+ "Minor mode to distinguish hard and soft newlines.
+When active, the functions `newline' and `open-line' add the
+text-property `hard' to newlines that they insert, and a line is
+only considered as a candidate to match `paragraph-start' or
+`paragraph-separate' if it follows a hard newline.
+
+Prefix argument says to turn mode on if positive, off if negative.
+When the mode is turned on, if there are newlines in the buffer but no hard
+newlines, ask the user whether to mark as hard any newlines preceeding a
+`paragraph-start' line. From a program, second arg INSERT specifies whether
+to do this; it can be `never' to change nothing, t or `always' to force
+marking, `guess' to try to do the right thing with no questions, nil
+or anything else to ask the user.
+
+Newlines not marked hard are called \"soft\", and are always internal
+to paragraphs. The fill functions insert and delete only soft newlines."
+ (interactive (list current-prefix-arg nil))
+ (if (or (<= (prefix-numeric-value arg) 0)
+ (and use-hard-newlines (null arg)))
+ ;; Turn mode off
+ (setq use-hard-newlines nil)
+ ;; Turn mode on
+ ;; Intuit hard newlines --
+ ;; mark as hard any newlines preceding a paragraph-start line.
+ (if (or (eq insert t) (eq insert 'always)
+ (and (not (eq 'never insert))
+ (not use-hard-newlines)
+ (not (text-property-any (point-min) (point-max) 'hard t))
+ (save-excursion
+ (goto-char (point-min))
+ (search-forward "\n" nil t))
+ (or (eq insert 'guess)
+ (y-or-n-p "Make newlines between paragraphs hard? "))))
+ (save-excursion
+ (goto-char (point-min))
+ (while (search-forward "\n" nil t)
+ (let ((pos (point)))
+ (move-to-left-margin)
+ (if (looking-at paragraph-start)
+ (progn
+ (set-hard-newline-properties (1- pos) pos)
+ ;; If paragraph-separate, newline after it is hard too.
+ (if (looking-at paragraph-separate)
+ (progn
+ (end-of-line)
+ (if (not (eobp))
+ (set-hard-newline-properties
+ (point) (1+ (point))))))))))))
+ (setq use-hard-newlines t)))
+
+(defcustom paragraph-start "[ \t\n\f]" "\
*Regexp for beginning of a line that starts OR separates paragraphs.
This regexp should match lines that separate paragraphs
and should also match lines that start a paragraph
\(and are part of that paragraph).
+This is matched against the text at the left margin, which is not necessarily
+the beginning of the line, so it should never use \"^\" as an anchor. This
+ensures that the paragraph functions will work equally well within a region
+of text indented by a margin setting.
+
The variable `paragraph-separate' specifies how to distinguish
lines that start paragraphs from lines that separate them.
If the variable `use-hard-newlines' is nonnil, then only lines following a
-hard newline are considered to match.")
-
-(defconst paragraph-separate "^[ \t\f]*$" "\
-*Regexp for beginning of a line that separates paragraphs.
-If you change this, you may have to change paragraph-start also.
-
-If the variable `use-hard-newlines' is nonnil, then only lines following a
-hard newline are considered to match.")
-
-(defconst sentence-end (purecopy "[.?!][]\"')}]*\\($\\| $\\|\t\\| \\)[ \t\n]*") "\
-*Regexp describing the end of a sentence.
+hard newline are considered to match."
+ :group 'paragraphs
+ :type 'regexp)
+
+;; paragraph-start requires a hard newline, but paragraph-separate does not:
+;; It is assumed that paragraph-separate is distinctive enough to be believed
+;; whenever it occurs, while it is reasonable to set paragraph-start to
+;; something very minimal, even including "." (which makes every hard newline
+;; start a new paragraph).
+
+(defcustom paragraph-separate "[ \t\f]*$"
+ "*Regexp for beginning of a line that separates paragraphs.
+If you change this, you may have to change `paragraph-start' also.
+
+This is matched against the text at the left margin, which is not necessarily
+the beginning of the line, so it should not use \"^\" as an anchor. This
+ensures that the paragraph functions will work equally within a region of
+text indented by a margin setting."
+ :group 'paragraphs
+ :type 'regexp)
+
+(defcustom sentence-end (purecopy "[.?!][]\"')}]*\\($\\| $\\|\t\\| \\)[ \t\n]*")
+ "*Regexp describing the end of a sentence.
All paragraph boundaries also end sentences, regardless.
In order to be recognized as the end of a sentence, the ending period,
question mark, or exclamation point must be followed by two spaces,
-unless it's inside some sort of quotes or parenthesis.")
+unless it's inside some sort of quotes or parenthesis."
+ :group 'paragraphs
+ :type 'regexp)
-(defconst page-delimiter "^\014" "\
-*Regexp describing line-beginnings that separate pages.")
+(defcustom page-delimiter "^\014"
+ "*Regexp describing line-beginnings that separate pages."
+ :group 'paragraphs
+ :type 'regexp)
-(defvar paragraph-ignore-fill-prefix nil "\
-Non-nil means the paragraph commands are not affected by `fill-prefix'.
-This is desirable in modes where blank lines are the paragraph delimiters.")
-
-(defsubst looking-at-hard (re)
- ;; Just for convenience in writing the function below.
- (and (or (null use-hard-newlines)
- (bobp)
- (get-text-property (1- (point)) 'hard))
- (looking-at re)))
+(defcustom paragraph-ignore-fill-prefix nil
+ "*Non-nil means the paragraph commands are not affected by `fill-prefix'.
+This is desirable in modes where blank lines are the paragraph delimiters."
+ :group 'paragraphs
+ :type 'boolean)
(defun forward-paragraph (&optional arg)
"Move forward to end of paragraph.
-With arg N, do it N times; negative arg -N means move backward N paragraphs.
+With argument ARG, do it ARG times;
+a negative argument ARG = -N means move backward N paragraphs.
A line which `paragraph-start' matches either separates paragraphs
\(if `paragraph-separate' matches it also) or is the first line of a paragraph.
(and fill-prefix (not (equal fill-prefix ""))
(not paragraph-ignore-fill-prefix)
(regexp-quote fill-prefix)))
+ ;; Remove ^ from paragraph-start and paragraph-sep if they are there.
+ ;; These regexps shouldn't be anchored, because we look for them
+ ;; starting at the left-margin. This allows paragraph commands to
+ ;; work normally with indented text.
+ ;; This hack will not find problem cases like "whatever\\|^something".
+ (paragraph-start (if (and (not (equal "" paragraph-start))
+ (equal ?^ (aref paragraph-start 0)))
+ (substring paragraph-start 1)
+ paragraph-start))
+ (paragraph-separate (if (and (not (equal "" paragraph-separate))
+ (equal ?^ (aref paragraph-separate 0)))
+ (substring paragraph-separate 1)
+ paragraph-separate))
(paragraph-separate
(if fill-prefix-regexp
- (concat paragraph-separate "\\|^"
+ (concat paragraph-separate "\\|"
fill-prefix-regexp "[ \t]*$")
- paragraph-separate)))
+ paragraph-separate))
+ ;; This is used for searching.
+ (sp-paragraph-start (concat "^[ \t]*\\(" paragraph-start "\\)"))
+ start found-start)
(while (and (< arg 0) (not (bobp)))
- (if (and (not (looking-at-hard paragraph-separate))
+ (if (and (not (looking-at paragraph-separate))
(re-search-backward "^\n" (max (1- (point)) (point-min)) t)
- (looking-at-hard paragraph-separate))
+ (looking-at paragraph-separate))
nil
+ (setq start (point))
;; Move back over paragraph-separating lines.
(forward-char -1) (beginning-of-line)
(while (and (not (bobp))
- (looking-at-hard paragraph-separate))
- (forward-line -1))
+ (progn (move-to-left-margin)
+ (looking-at paragraph-separate)))
+ (forward-line -1))
(if (bobp)
nil
;; Go to end of the previous (non-separating) line.
;; Search back for line that starts or separates paragraphs.
(if (if fill-prefix-regexp
;; There is a fill prefix; it overrides paragraph-start.
- (progn
- (while (progn (beginning-of-line)
- (and (not (bobp))
- (not (looking-at-hard
- paragraph-separate))
- (looking-at fill-prefix-regexp)))
- (forward-line -1))
- (not (bobp)))
- (while (and (re-search-backward paragraph-start nil 1)
- use-hard-newlines
- (not (bobp))
- (null (get-text-property (1- (point)) 'hard)))
- (if (not (bobp)) (backward-char 1)))
- (> (point) (point-min)))
+ (let (multiple-lines)
+ (while (and (progn (beginning-of-line) (not (bobp)))
+ (progn (move-to-left-margin)
+ (not (looking-at paragraph-separate)))
+ (looking-at fill-prefix-regexp))
+ (if (not (= (point) start))
+ (setq multiple-lines t))
+ (forward-line -1))
+ (move-to-left-margin)
+;;; This deleted code caused a long hanging-indent line
+;;; not to be filled together with the following lines.
+;;; ;; Don't move back over a line before the paragraph
+;;; ;; which doesn't start with fill-prefix
+;;; ;; unless that is the only line we've moved over.
+;;; (and (not (looking-at fill-prefix-regexp))
+;;; multiple-lines
+;;; (forward-line 1))
+ (not (bobp)))
+ (while (and (re-search-backward sp-paragraph-start nil 1)
+ (setq found-start t)
+ ;; Found a candidate, but need to check if it is a
+ ;; REAL paragraph-start.
+ (progn (setq start (point))
+ (move-to-left-margin)
+ (not (looking-at paragraph-separate)))
+ (not (and (looking-at paragraph-start)
+ (not
+ (and use-hard-newlines
+ (not (bobp))
+ (not (get-text-property (1- start)
+ 'hard)))))))
+ (setq found-start nil)
+ (goto-char start))
+ found-start)
;; Found one.
(progn
;; Move forward over paragraph separators.
;; We know this cannot reach the place we started
;; because we know we moved back over a non-separator.
- (while (and (not (eobp)) (looking-at-hard paragraph-separate))
+ (while (and (not (eobp))
+ (progn (move-to-left-margin)
+ (looking-at paragraph-separate)))
(forward-line 1))
- (if (eq (char-after (- (point) 2)) ?\n)
- (forward-line -1)))
+ ;; If line before paragraph is just margin, back up to there.
+ (end-of-line 0)
+ (if (> (current-column) (current-left-margin))
+ (forward-char 1)
+ (skip-chars-backward " \t")
+ (if (not (bolp))
+ (forward-line 1))))
;; No starter or separator line => use buffer beg.
(goto-char (point-min)))))
(setq arg (1+ arg)))
(while (and (> arg 0) (not (eobp)))
- (beginning-of-line)
+ ;; Move forward over separator lines, and one more line.
(while (prog1 (and (not (eobp))
- (looking-at-hard paragraph-separate))
+ (progn (move-to-left-margin) (not (eobp)))
+ (looking-at paragraph-separate))
(forward-line 1)))
(if fill-prefix-regexp
;; There is a fill prefix; it overrides paragraph-start.
(while (and (not (eobp))
- (not (looking-at-hard paragraph-separate))
+ (progn (move-to-left-margin) (not (eobp)))
+ (not (looking-at paragraph-separate))
(looking-at fill-prefix-regexp))
(forward-line 1))
- (while (and (re-search-forward paragraph-start nil 1)
- (not (eobp))
- use-hard-newlines
- (null (get-text-property (1- (match-beginning 0)) 'hard)))
+ (while (and (re-search-forward sp-paragraph-start nil 1)
+ (progn (setq start (match-beginning 0))
+ (goto-char start)
+ (not (eobp)))
+ (progn (move-to-left-margin)
+ (not (looking-at paragraph-separate)))
+ (or (not (looking-at paragraph-start))
+ (and use-hard-newlines
+ (not (get-text-property (1- start) 'hard)))))
(forward-char 1))
(if (< (point) (point-max))
- (goto-char (match-beginning 0))))
+ (goto-char start)))
(setq arg (1- arg)))))
(defun backward-paragraph (&optional arg)
"Move backward to start of paragraph.
-With arg N, do it N times; negative arg -N means move forward N paragraphs.
+With argument ARG, do it ARG times;
+a negative argument ARG = -N means move forward N paragraphs.
A paragraph start is the beginning of a line which is a
`first-line-of-paragraph' or which is ordinary text and follows a
HCoop / bpt / emacs.git / blobdiff