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60370d40 | 1 | ;;; kinsoku.el --- `Kinsoku' processing funcs -*- coding: iso-2022-7bit; -*- |
4ed46869 | 2 | |
4ed46869 | 3 | ;; Copyright (C) 1995 Electrotechnical Laboratory, JAPAN. |
fa526c4a | 4 | ;; Licensed to the Free Software Foundation. |
4ed46869 | 5 | |
fa526c4a | 6 | ;; Keywords: mule, kinsoku |
4ed46869 KH |
7 | |
8 | ;; This file is part of GNU Emacs. | |
9 | ||
10 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
11 | ;; it under the terms of the GNU General Public License as published by | |
12 | ;; the Free Software Foundation; either version 2, or (at your option) | |
13 | ;; any later version. | |
14 | ||
15 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
16 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | ;; GNU General Public License for more details. | |
19 | ||
20 | ;; You should have received a copy of the GNU General Public License | |
369314dc KH |
21 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
22 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
23 | ;; Boston, MA 02111-1307, USA. | |
4ed46869 KH |
24 | |
25 | ;;; Commentary: | |
26 | ||
27 | ;; `Kinsoku' processing is to prohibit specific characters to be | |
28 | ;; placed at beginning of line or at end of line. Characters not to | |
29 | ;; be placed at beginning and end of line have character category `>' | |
30 | ;; and `<' respectively. This restriction is dissolved by making a | |
31 | ;; line longer or shorter. | |
32 | ;; | |
33 | ;; `Kinsoku' is a Japanese word which originally means ordering to | |
34 | ;; stay in one place, and is used for the text processing described | |
35 | ;; above in the context of text formatting. | |
36 | ||
37 | ;;; Code: | |
38 | ||
39 | (defvar kinsoku-limit 4 | |
40 | "How many more columns we can make lines longer by `kinsoku' processing. | |
41 | The value 0 means there's no limitation.") | |
42 | ||
43 | ;; Setting character category `>' for characters which should not be | |
44 | ;; placed at beginning of line. | |
45 | (let* ((kinsoku-bol | |
46 | (concat | |
47 | ;; ASCII | |
48 | "!)-_~}]:;',.?" | |
a09244e6 | 49 | ;; Latin JISX0201 |
e8dd0160 | 50 | ;; Instead of putting Latin JISX0201 string directly, we |
a09244e6 KH |
51 | ;; generate the string as below to avoid character |
52 | ;; unification problem. | |
53 | (let* ((str1 "!)-_~}]:;',.?") | |
54 | (len (length str1)) | |
55 | (idx 0) | |
56 | (str2 "") | |
57 | ch) | |
58 | (while (< idx len) | |
59 | (setq ch (make-char 'latin-jisx0201 (aref str1 idx)) | |
60 | str2 (concat str2 (char-to-string ch)) | |
61 | idx (1+ idx))) | |
62 | str2) | |
63 | ;; Katakana JISX0201 | |
64 | "\e(I!#'()*+,-./0^_\e(B" | |
4ed46869 KH |
65 | ;; Japanese JISX0208 |
66 | "\e$B!"!#!$!%!&!'!(!)!*!+!,!-!.!/!0!1!2!3!4!5!6!7!8!9!:!;!<!=!>\e(B\ | |
67 | \e$B!?!@!A!B!C!D!E!G!I!K!M!O!Q!S!U!W!Y![!k!l!m!n\e(B\ | |
68 | \e$B$!$#$%$'$)$C$c$e$g$n%!%#%%%'%)%C%c%e%g%n%u%v\e(B" | |
69 | ;; Chinese GB2312 | |
70 | "\e$A!"!##.#,!$!%!&!'!(!)!*!+!,!-!/!1#)!3!5!7!9!;!=\e(B\ | |
71 | \e$A!?#;#:#?#!!@!A!B!C!c!d!e!f#/#\#"#_#~#|(e\e(B" | |
72 | ;; Chinese BIG5 | |
73 | "\e$(0!"!#!$!%!&!'!(!)!*!+!,!-!.!/!0!1!2\e(B\ | |
74 | \e$(0!3!4!5!6!7!8!9!:!;!<!=!?!A!C!E!G!I!K\e(B\ | |
4c0f6426 | 75 | \e$(0!M!O!Q!S!U!W!Y![!]!_!a!c!e!g!i!k!q\e(B\ |
4ed46869 KH |
76 | \e$(0"#"$"%"&"'"(")"*"+","2"3"4"j"k"l"x%7\e(B")) |
77 | (len (length kinsoku-bol)) | |
78 | (idx 0) | |
79 | ch) | |
80 | (while (< idx len) | |
4a027a0d KH |
81 | (setq ch (aref kinsoku-bol idx) |
82 | idx (1+ idx)) | |
4ed46869 KH |
83 | (modify-category-entry ch ?>))) |
84 | ||
85 | ;; Setting character category `<' for characters which should not be | |
86 | ;; placed at end of line. | |
87 | (let* ((kinsoku-eol | |
88 | (concat | |
89 | ;; ASCII | |
90 | "({[`" | |
a09244e6 KH |
91 | ;; Latin JISX0201 |
92 | ;; See the comment above. | |
93 | (let* ((str1 "({[`") | |
94 | (len (length str1)) | |
95 | (idx 0) | |
96 | (str2 "") | |
97 | ch) | |
98 | (while (< idx len) | |
99 | (setq ch (make-char 'latin-jisx0201 (aref str1 idx)) | |
100 | str2 (concat str2 (char-to-string ch)) | |
101 | idx (1+ idx))) | |
102 | str2) | |
103 | ;; JISX0201 Katakana | |
104 | "\e(I"\e(B" | |
4ed46869 KH |
105 | ;; Japanese JISX0208 |
106 | "\e$B!F!H!J!L!N!P!R!T!V!X!Z!k!l!m!n!w!x\e(B\ | |
107 | \e$A!.!0#"#(!2!4!6!8!:!<!>!c!d!e#@!f!l\e(B" | |
108 | ;; Chinese GB2312 | |
109 | "\e$A(E(F(G(H(I(J(K(L(M(N(O(P(Q(R(S(T(U(V(W(X(Y(h\e(B\ | |
110 | \e$(0!>!@!B!D!F!H!J!L!N!P!R!T!V!X!Z!\!^!`!b\e(B" | |
111 | ;; Chinese BIG5 | |
112 | "\e$(0!d!f!h!j!k!q!p"i"j"k"n"x$u$v$w$x$y$z${\e(B\ | |
113 | \e$(0$|$}$~%!%"%#%$%%%&%'%(%)%*%+%:\e(B")) | |
114 | (len (length kinsoku-eol)) | |
115 | (idx 0) | |
116 | ch) | |
117 | (while (< idx len) | |
4a027a0d KH |
118 | (setq ch (aref kinsoku-eol idx) |
119 | idx (1+ idx)) | |
4ed46869 KH |
120 | (modify-category-entry ch ?<))) |
121 | ||
122 | ;; Try to resolve `kinsoku' restriction by making the current line longer. | |
123 | (defun kinsoku-longer () | |
6b61353c KH |
124 | (let ((pos-and-column |
125 | (save-excursion | |
126 | (forward-char 1) | |
127 | (while (and (not (eobp)) | |
128 | (or (aref (char-category-set (following-char)) ?>) | |
129 | ;; protect non-kinsoku words | |
130 | (not (or (eq (preceding-char) ? ) | |
131 | (aref (char-category-set (preceding-char)) | |
132 | ?|))))) | |
133 | (forward-char 1)) | |
134 | (cons (point) (current-column))))) | |
4ed46869 KH |
135 | (if (or (<= kinsoku-limit 0) |
136 | (< (cdr pos-and-column) (+ (current-fill-column) kinsoku-limit))) | |
137 | (goto-char (car pos-and-column))))) | |
138 | ||
139 | ;; Try to resolve `kinsoku' restriction by making the current line shorter. | |
a09244e6 | 140 | ;; The line can't be broken before the buffer position LINEBEG. |
4ed46869 KH |
141 | (defun kinsoku-shorter (linebeg) |
142 | (let ((pos (save-excursion | |
143 | (forward-char -1) | |
6b61353c KH |
144 | (while (and |
145 | (< linebeg (point)) | |
146 | (or (aref (char-category-set (preceding-char)) ?<) | |
147 | (aref (char-category-set (following-char)) ?>) | |
148 | ;; protect non-kinsoku words | |
149 | (not (or (eq (preceding-char) ? ) | |
150 | (aref (char-category-set (preceding-char)) | |
151 | ?|))))) | |
4ed46869 KH |
152 | (forward-char -1)) |
153 | (point)))) | |
154 | (if (< linebeg pos) | |
155 | (goto-char pos)))) | |
156 | ||
157 | ;;;###autoload | |
158 | (defun kinsoku (linebeg) | |
159 | "Go to a line breaking position near point by doing `kinsoku' processing. | |
160 | LINEBEG is a buffer position we can't break a line before. | |
161 | ||
162 | `Kinsoku' processing is to prohibit specific characters to be placed | |
163 | at beginning of line or at end of line. Characters not to be placed | |
164 | at beginning and end of line have character category `>' and `<' | |
165 | respectively. This restriction is dissolved by making a line longer or | |
166 | shorter. | |
167 | ||
168 | `Kinsoku' is a Japanese word which originally means ordering to stay | |
169 | in one place, and is used for the text processing described above in | |
170 | the context of text formatting." | |
11e60d92 KH |
171 | (if enable-kinsoku |
172 | (if (or (and | |
173 | ;; The character after point can't be placed at beginning | |
a1506d29 | 174 | ;; of line. |
11e60d92 KH |
175 | (aref (char-category-set (following-char)) ?>) |
176 | ;; We at first try to dissolve this situation by making a | |
177 | ;; line longer. If it fails, then try making a line | |
178 | ;; shorter. | |
179 | (not (kinsoku-longer))) | |
180 | ;; The character before point can't be placed at end of line. | |
181 | (aref (char-category-set (preceding-char)) ?<)) | |
182 | (kinsoku-shorter linebeg)))) | |
4ed46869 | 183 | |
6b61353c | 184 | ;;; arch-tag: e6b036bc-9e5b-4e9f-a22c-4ed04e37777e |
60370d40 | 185 | ;;; kinsoku.el ends here |