Commit | Line | Data |
---|---|---|
a2535589 JA |
1 | ;; Paragraph and sentence parsing. |
2 | ;; Copyright (C) 1985 Free Software Foundation, Inc. | |
3 | ||
4 | ;; This file is part of GNU Emacs. | |
5 | ||
6 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
7 | ;; it under the terms of the GNU General Public License as published by | |
8 | ;; the Free Software Foundation; either version 1, or (at your option) | |
9 | ;; any later version. | |
10 | ||
11 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
12 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | ;; GNU General Public License for more details. | |
15 | ||
16 | ;; You should have received a copy of the GNU General Public License | |
17 | ;; along with GNU Emacs; see the file COPYING. If not, write to | |
18 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
19 | ||
20 | ||
21 | (defvar paragraph-ignore-fill-prefix nil | |
22 | "Non-nil means the paragraph commands are not affected by fill-prefix. | |
23 | This is desirable in modes where blank lines are the paragraph delimiters.") | |
24 | ||
25 | (defun forward-paragraph (&optional arg) | |
26 | "Move forward to end of paragraph. | |
27 | With arg N, do it N times; negative arg -N means move forward N paragraphs. | |
28 | ||
29 | A line which `paragraph-start' matches either separates paragraphs | |
30 | \(if `paragraph-separate' matches it also) or is the first line of a paragraph. | |
31 | A paragraph end is the beginning of a line which is not part of the paragraph | |
32 | to which the end of the previous line belongs, or the end of the buffer." | |
33 | (interactive "p") | |
34 | (or arg (setq arg 1)) | |
35 | (let* ((fill-prefix-regexp | |
36 | (and fill-prefix (not (equal fill-prefix "")) | |
37 | (not paragraph-ignore-fill-prefix) | |
38 | (regexp-quote fill-prefix))) | |
39 | (paragraph-separate | |
40 | (if fill-prefix-regexp | |
41 | (concat paragraph-separate "\\|^" | |
42 | fill-prefix-regexp "[ \t]*$") | |
43 | paragraph-separate))) | |
44 | (while (< arg 0) | |
45 | (if (and (not (looking-at paragraph-separate)) | |
46 | (re-search-backward "^\n" (max (1- (point)) (point-min)) t)) | |
47 | nil | |
48 | (forward-char -1) (beginning-of-line) | |
49 | (while (and (not (bobp)) (looking-at paragraph-separate)) | |
50 | (forward-line -1)) | |
51 | (end-of-line) | |
52 | ;; Search back for line that starts or separates paragraphs. | |
53 | (if (if fill-prefix-regexp | |
54 | ;; There is a fill prefix; it overrides paragraph-start. | |
55 | (progn | |
56 | (while (progn (beginning-of-line) | |
57 | (and (not (bobp)) | |
58 | (not (looking-at paragraph-separate)) | |
59 | (looking-at fill-prefix-regexp))) | |
60 | (forward-line -1)) | |
61 | (not (bobp))) | |
62 | (re-search-backward paragraph-start nil t)) | |
63 | ;; Found one. | |
64 | (progn | |
65 | (while (and (not (eobp)) (looking-at paragraph-separate)) | |
66 | (forward-line 1)) | |
67 | (if (eq (char-after (- (point) 2)) ?\n) | |
68 | (forward-line -1))) | |
69 | ;; No starter or separator line => use buffer beg. | |
70 | (goto-char (point-min)))) | |
71 | (setq arg (1+ arg))) | |
72 | (while (> arg 0) | |
73 | (beginning-of-line) | |
74 | (while (prog1 (and (not (eobp)) | |
75 | (looking-at paragraph-separate)) | |
76 | (forward-line 1))) | |
77 | (if fill-prefix-regexp | |
78 | ;; There is a fill prefix; it overrides paragraph-start. | |
79 | (while (and (not (eobp)) | |
80 | (not (looking-at paragraph-separate)) | |
81 | (looking-at fill-prefix-regexp)) | |
82 | (forward-line 1)) | |
83 | (if (re-search-forward paragraph-start nil t) | |
84 | (goto-char (match-beginning 0)) | |
85 | (goto-char (point-max)))) | |
86 | (setq arg (1- arg))))) | |
87 | ||
88 | (defun backward-paragraph (&optional arg) | |
89 | "Move backward to start of paragraph. | |
90 | With arg N, do it N times; negative arg -N means move forward N paragraphs. | |
91 | ||
92 | A paragraph start is the beginning of a line which is a first-line-of-paragraph | |
93 | or which is ordinary text and follows a paragraph-separating line; except: | |
94 | if the first real line of a paragraph is preceded by a blank line, | |
95 | the paragraph starts at that blank line. | |
96 | See forward-paragraph for more information." | |
97 | (interactive "p") | |
98 | (or arg (setq arg 1)) | |
99 | (forward-paragraph (- arg))) | |
100 | ||
101 | (defun mark-paragraph () | |
102 | "Put point at beginning of this paragraph, mark at end. | |
103 | The paragraph marked is the one that contains point or follows point." | |
104 | (interactive) | |
105 | (forward-paragraph 1) | |
106 | (push-mark nil t) | |
107 | (backward-paragraph 1)) | |
108 | ||
109 | (defun kill-paragraph (arg) | |
110 | "Kill forward to end of paragraph. | |
111 | With arg N, kill forward to Nth end of paragraph; | |
112 | negative arg -N means kill backward to Nth start of paragraph." | |
113 | (interactive "*p") | |
114 | (kill-region (point) (progn (forward-paragraph arg) (point)))) | |
115 | ||
116 | (defun backward-kill-paragraph (arg) | |
117 | "Kill back to start of paragraph. | |
118 | With arg N, kill back to Nth start of paragraph; | |
119 | negative arg -N means kill forward to Nth end of paragraph." | |
120 | (interactive "*p") | |
121 | (kill-region (point) (progn (backward-paragraph arg) (point)))) | |
122 | ||
123 | (defun transpose-paragraphs (arg) | |
124 | "Interchange this (or next) paragraph with previous one." | |
125 | (interactive "*p") | |
126 | (transpose-subr 'forward-paragraph arg)) | |
127 | ||
128 | (defun start-of-paragraph-text () | |
129 | (let ((opoint (point)) npoint) | |
130 | (forward-paragraph -1) | |
131 | (setq npoint (point)) | |
132 | (skip-chars-forward " \t\n") | |
b4e6c391 RS |
133 | ;; If the range of blank lines found spans the original start point, |
134 | ;; try again from the beginning of it. | |
135 | ;; Must be careful to avoid infinite loop | |
136 | ;; when following a single return at start of buffer. | |
137 | (if (and (>= (point) opoint) (< npoint opoint)) | |
a2535589 JA |
138 | (progn |
139 | (goto-char npoint) | |
140 | (if (> npoint (point-min)) | |
141 | (start-of-paragraph-text)))))) | |
142 | ||
143 | (defun end-of-paragraph-text () | |
144 | (let ((opoint (point))) | |
145 | (forward-paragraph 1) | |
146 | (if (eq (preceding-char) ?\n) (forward-char -1)) | |
147 | (if (<= (point) opoint) | |
148 | (progn | |
149 | (forward-char 1) | |
150 | (if (< (point) (point-max)) | |
151 | (end-of-paragraph-text)))))) | |
152 | ||
153 | (defun forward-sentence (&optional arg) | |
154 | "Move forward to next sentence-end. With argument, repeat. | |
155 | With negative argument, move backward repeatedly to sentence-beginning. | |
156 | ||
157 | The variable `sentence-end' is a regular expression that matches ends | |
158 | of sentences. Also, every paragraph boundary terminates sentences as | |
159 | well." | |
160 | (interactive "p") | |
161 | (or arg (setq arg 1)) | |
162 | (while (< arg 0) | |
163 | (let ((par-beg (save-excursion (start-of-paragraph-text) (point)))) | |
164 | (if (re-search-backward (concat sentence-end "[^ \t\n]") par-beg t) | |
165 | (goto-char (1- (match-end 0))) | |
166 | (goto-char par-beg))) | |
167 | (setq arg (1+ arg))) | |
168 | (while (> arg 0) | |
169 | (let ((par-end (save-excursion (end-of-paragraph-text) (point)))) | |
170 | (if (re-search-forward sentence-end par-end t) | |
171 | (skip-chars-backward " \t\n") | |
172 | (goto-char par-end))) | |
173 | (setq arg (1- arg)))) | |
174 | ||
175 | (defun backward-sentence (&optional arg) | |
176 | "Move backward to start of sentence. With arg, do it arg times. | |
177 | See forward-sentence for more information." | |
178 | (interactive "p") | |
179 | (or arg (setq arg 1)) | |
180 | (forward-sentence (- arg))) | |
181 | ||
182 | (defun kill-sentence (&optional arg) | |
183 | "Kill from point to end of sentence. | |
184 | With arg, repeat; negative arg -N means kill back to Nth start of sentence." | |
185 | (interactive "*p") | |
186 | (let ((beg (point))) | |
187 | (forward-sentence arg) | |
188 | (kill-region beg (point)))) | |
189 | ||
190 | (defun backward-kill-sentence (&optional arg) | |
191 | "Kill back from point to start of sentence. | |
192 | With arg, repeat, or kill forward to Nth end of sentence if negative arg -N." | |
193 | (interactive "*p") | |
194 | (let ((beg (point))) | |
195 | (backward-sentence arg) | |
196 | (kill-region beg (point)))) | |
197 | ||
198 | (defun mark-end-of-sentence (arg) | |
199 | "Put mark at end of sentence. Arg works as in forward-sentence." | |
200 | (interactive "p") | |
201 | (push-mark | |
202 | (save-excursion | |
203 | (forward-sentence arg) | |
204 | (point)))) | |
205 | ||
206 | (defun transpose-sentences (arg) | |
207 | "Interchange this (next) and previous sentence." | |
208 | (interactive "*p") | |
209 | (transpose-subr 'forward-sentence arg)) |