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dcfdbac7 | 1 | /* GNU Emacs routines to deal with case tables. |
3a22ee35 | 2 | Copyright (C) 1993, 1994 Free Software Foundation, Inc. |
dcfdbac7 JB |
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 | |
7c938215 | 8 | the Free Software Foundation; either version 2, or (at your option) |
dcfdbac7 JB |
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 | |
3b7ad313 EN |
18 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
19 | Boston, MA 02111-1307, USA. */ | |
dcfdbac7 JB |
20 | |
21 | /* Written by Howard Gayle. See chartab.c for details. */ | |
22 | ||
18160b98 | 23 | #include <config.h> |
dcfdbac7 JB |
24 | #include "lisp.h" |
25 | #include "buffer.h" | |
c0c15b93 | 26 | #include "charset.h" |
dcfdbac7 | 27 | |
7f7fef04 | 28 | Lisp_Object Qcase_table_p, Qcase_table; |
dcfdbac7 JB |
29 | Lisp_Object Vascii_downcase_table, Vascii_upcase_table; |
30 | Lisp_Object Vascii_canon_table, Vascii_eqv_table; | |
31 | ||
da2795b2 KH |
32 | /* Used as a temporary in DOWNCASE and other macros in lisp.h. No |
33 | need to mark it, since it is used only very temporarily. */ | |
2e34157c RS |
34 | int case_temp1; |
35 | Lisp_Object case_temp2; | |
da2795b2 KH |
36 | |
37 | static void set_canon (); | |
38 | static void set_identity (); | |
39 | static void shuffle (); | |
dcfdbac7 JB |
40 | |
41 | DEFUN ("case-table-p", Fcase_table_p, Scase_table_p, 1, 1, 0, | |
fdb82f93 PJ |
42 | doc: /* Return t iff OBJECT is a case table. |
43 | See `set-case-table' for more information on these data structures. */) | |
44 | (object) | |
2858a1c1 | 45 | Lisp_Object object; |
dcfdbac7 | 46 | { |
4b3bd052 | 47 | Lisp_Object up, canon, eqv; |
dcfdbac7 | 48 | |
2858a1c1 | 49 | if (! CHAR_TABLE_P (object)) |
7f7fef04 | 50 | return Qnil; |
2858a1c1 | 51 | if (! EQ (XCHAR_TABLE (object)->purpose, Qcase_table)) |
7f7fef04 | 52 | return Qnil; |
dcfdbac7 | 53 | |
2858a1c1 EN |
54 | up = XCHAR_TABLE (object)->extras[0]; |
55 | canon = XCHAR_TABLE (object)->extras[1]; | |
56 | eqv = XCHAR_TABLE (object)->extras[2]; | |
7f7fef04 RS |
57 | |
58 | return ((NILP (up) || CHAR_TABLE_P (up)) | |
d427b66a | 59 | && ((NILP (canon) && NILP (eqv)) |
7f7fef04 RS |
60 | || (CHAR_TABLE_P (canon) |
61 | && (NILP (eqv) || CHAR_TABLE_P (eqv)))) | |
dcfdbac7 JB |
62 | ? Qt : Qnil); |
63 | } | |
64 | ||
65 | static Lisp_Object | |
66 | check_case_table (obj) | |
67 | Lisp_Object obj; | |
68 | { | |
69 | register Lisp_Object tem; | |
70 | ||
d427b66a | 71 | while (tem = Fcase_table_p (obj), NILP (tem)) |
b37902c8 | 72 | obj = wrong_type_argument (Qcase_table_p, obj); |
dcfdbac7 JB |
73 | return (obj); |
74 | } | |
75 | ||
76 | DEFUN ("current-case-table", Fcurrent_case_table, Scurrent_case_table, 0, 0, 0, | |
fdb82f93 PJ |
77 | doc: /* Return the case table of the current buffer. */) |
78 | () | |
dcfdbac7 | 79 | { |
7f7fef04 | 80 | return current_buffer->downcase_table; |
dcfdbac7 JB |
81 | } |
82 | ||
a1de6b4b | 83 | DEFUN ("standard-case-table", Fstandard_case_table, Sstandard_case_table, 0, 0, 0, |
fdb82f93 PJ |
84 | doc: /* Return the standard case table. |
85 | This is the one used for new buffers. */) | |
86 | () | |
dcfdbac7 | 87 | { |
7f7fef04 | 88 | return Vascii_downcase_table; |
dcfdbac7 JB |
89 | } |
90 | ||
d9da9451 JB |
91 | static Lisp_Object set_case_table (); |
92 | ||
dcfdbac7 | 93 | DEFUN ("set-case-table", Fset_case_table, Sset_case_table, 1, 1, 0, |
fdb82f93 PJ |
94 | doc: /* Select a new case table for the current buffer. |
95 | A case table is a char-table which maps characters | |
96 | to their lower-case equivalents. It also has three \"extra\" slots | |
97 | which may be additional char-tables or nil. | |
98 | These slots are called UPCASE, CANONICALIZE and EQUIVALENCES. | |
99 | UPCASE maps each character to its upper-case equivalent; | |
100 | if lower and upper case characters are in 1-1 correspondence, | |
101 | you may use nil and the upcase table will be deduced from DOWNCASE. | |
102 | CANONICALIZE maps each character to a canonical equivalent; | |
103 | any two characters that are related by case-conversion have the same | |
104 | canonical equivalent character; it may be nil, in which case it is | |
105 | deduced from DOWNCASE and UPCASE. | |
106 | EQUIVALENCES is a map that cyclicly permutes each equivalence class | |
107 | (of characters with the same canonical equivalent); it may be nil, | |
108 | in which case it is deduced from CANONICALIZE. */) | |
109 | (table) | |
dcfdbac7 JB |
110 | Lisp_Object table; |
111 | { | |
d9da9451 | 112 | return set_case_table (table, 0); |
dcfdbac7 JB |
113 | } |
114 | ||
a1de6b4b | 115 | DEFUN ("set-standard-case-table", Fset_standard_case_table, Sset_standard_case_table, 1, 1, 0, |
fdb82f93 PJ |
116 | doc: /* Select a new standard case table for new buffers. |
117 | See `set-case-table' for more info on case tables. */) | |
118 | (table) | |
dcfdbac7 JB |
119 | Lisp_Object table; |
120 | { | |
d9da9451 | 121 | return set_case_table (table, 1); |
dcfdbac7 JB |
122 | } |
123 | ||
d9da9451 | 124 | static Lisp_Object |
dcfdbac7 JB |
125 | set_case_table (table, standard) |
126 | Lisp_Object table; | |
127 | int standard; | |
128 | { | |
4b3bd052 | 129 | Lisp_Object up, canon, eqv; |
da2795b2 | 130 | Lisp_Object indices[3]; |
dcfdbac7 JB |
131 | |
132 | check_case_table (table); | |
133 | ||
7f7fef04 RS |
134 | up = XCHAR_TABLE (table)->extras[0]; |
135 | canon = XCHAR_TABLE (table)->extras[1]; | |
136 | eqv = XCHAR_TABLE (table)->extras[2]; | |
dcfdbac7 | 137 | |
d427b66a | 138 | if (NILP (up)) |
dcfdbac7 | 139 | { |
7f7fef04 | 140 | up = Fmake_char_table (Qcase_table, Qnil); |
da2795b2 KH |
141 | map_char_table (set_identity, Qnil, table, up, 0, indices); |
142 | map_char_table (shuffle, Qnil, table, up, 0, indices); | |
7f7fef04 | 143 | XCHAR_TABLE (table)->extras[0] = up; |
dcfdbac7 JB |
144 | } |
145 | ||
d427b66a | 146 | if (NILP (canon)) |
dcfdbac7 | 147 | { |
4b3bd052 | 148 | canon = Fmake_char_table (Qcase_table, Qnil); |
7f7fef04 | 149 | XCHAR_TABLE (table)->extras[1] = canon; |
da2795b2 | 150 | map_char_table (set_canon, Qnil, table, table, 0, indices); |
5a0fd72f RS |
151 | } |
152 | ||
153 | if (NILP (eqv)) | |
154 | { | |
7f7fef04 | 155 | eqv = Fmake_char_table (Qcase_table, Qnil); |
da2795b2 KH |
156 | map_char_table (set_identity, Qnil, canon, eqv, 0, indices); |
157 | map_char_table (shuffle, Qnil, canon, eqv, 0, indices); | |
4b3bd052 | 158 | XCHAR_TABLE (table)->extras[2] = eqv; |
dcfdbac7 JB |
159 | } |
160 | ||
426f6c23 RS |
161 | /* This is so set_image_of_range_1 in regex.c can find the EQV table. */ |
162 | XCHAR_TABLE (canon)->extras[2] = eqv; | |
163 | ||
dcfdbac7 | 164 | if (standard) |
4b3bd052 | 165 | Vascii_downcase_table = table; |
dcfdbac7 | 166 | else |
6c6fcbf8 RS |
167 | { |
168 | current_buffer->downcase_table = table; | |
169 | current_buffer->upcase_table = up; | |
170 | current_buffer->case_canon_table = canon; | |
171 | current_buffer->case_eqv_table = eqv; | |
172 | } | |
7f7fef04 | 173 | |
dcfdbac7 JB |
174 | return table; |
175 | } | |
176 | \f | |
da2795b2 KH |
177 | /* The following functions are called in map_char_table. */ |
178 | ||
179 | /* Set CANON char-table element for C to a translated ELT by UP and | |
180 | DOWN char-tables. This is done only when ELT is a character. The | |
181 | char-tables CANON, UP, and DOWN are in CASE_TABLE. */ | |
e16696ba | 182 | |
c0c15b93 | 183 | static void |
da2795b2 KH |
184 | set_canon (case_table, c, elt) |
185 | Lisp_Object case_table, c, elt; | |
c0c15b93 | 186 | { |
da2795b2 KH |
187 | Lisp_Object up = XCHAR_TABLE (case_table)->extras[0]; |
188 | Lisp_Object canon = XCHAR_TABLE (case_table)->extras[1]; | |
c0c15b93 | 189 | |
da2795b2 KH |
190 | if (NATNUMP (elt)) |
191 | Faset (canon, c, Faref (case_table, Faref (up, elt))); | |
c0c15b93 | 192 | } |
dcfdbac7 | 193 | |
da2795b2 KH |
194 | /* Set elements of char-table TABLE for C to C itself. This is done |
195 | only when ELT is a character. This is called in map_char_table. */ | |
e16696ba | 196 | |
7f7fef04 | 197 | static void |
da2795b2 KH |
198 | set_identity (table, c, elt) |
199 | Lisp_Object table, c, elt; | |
dcfdbac7 | 200 | { |
da2795b2 KH |
201 | if (NATNUMP (elt)) |
202 | Faset (table, c, c); | |
dcfdbac7 | 203 | } |
c0c15b93 | 204 | |
da2795b2 KH |
205 | /* Permute the elements of TABLE (which is initially an identity |
206 | mapping) so that it has one cycle for each equivalence class | |
207 | induced by the translation table on which map_char_table is | |
208 | operated. */ | |
c0c15b93 KH |
209 | |
210 | static void | |
da2795b2 KH |
211 | shuffle (table, c, elt) |
212 | Lisp_Object table, c, elt; | |
c0c15b93 | 213 | { |
2e34157c | 214 | if (NATNUMP (elt) && !EQ (c, elt)) |
da2795b2 KH |
215 | { |
216 | Lisp_Object tem = Faref (table, elt); | |
217 | Faset (table, elt, c); | |
218 | Faset (table, c, tem); | |
219 | } | |
c0c15b93 | 220 | } |
dcfdbac7 | 221 | \f |
dfcf069d | 222 | void |
dcfdbac7 JB |
223 | init_casetab_once () |
224 | { | |
225 | register int i; | |
7f7fef04 RS |
226 | Lisp_Object down, up; |
227 | Qcase_table = intern ("case-table"); | |
228 | staticpro (&Qcase_table); | |
229 | ||
230 | /* Intern this now in case it isn't already done. | |
231 | Setting this variable twice is harmless. | |
232 | But don't staticpro it here--that is done in alloc.c. */ | |
233 | Qchar_table_extra_slots = intern ("char-table-extra-slots"); | |
dcfdbac7 | 234 | |
7f7fef04 RS |
235 | /* Now we are ready to set up this property, so we can |
236 | create char tables. */ | |
4b3bd052 | 237 | Fput (Qcase_table, Qchar_table_extra_slots, make_number (3)); |
7f7fef04 RS |
238 | |
239 | down = Fmake_char_table (Qcase_table, Qnil); | |
240 | Vascii_downcase_table = down; | |
e1b490ca | 241 | XCHAR_TABLE (down)->purpose = Qcase_table; |
dcfdbac7 | 242 | |
c0c15b93 KH |
243 | for (i = 0; i < CHAR_TABLE_SINGLE_BYTE_SLOTS; i++) |
244 | XSETFASTINT (XCHAR_TABLE (down)->contents[i], | |
245 | (i >= 'A' && i <= 'Z') ? i + ('a' - 'A') : i); | |
7f7fef04 RS |
246 | |
247 | XCHAR_TABLE (down)->extras[1] = Fcopy_sequence (down); | |
dcfdbac7 | 248 | |
7f7fef04 RS |
249 | up = Fmake_char_table (Qcase_table, Qnil); |
250 | XCHAR_TABLE (down)->extras[0] = up; | |
dcfdbac7 | 251 | |
c0c15b93 KH |
252 | for (i = 0; i < CHAR_TABLE_SINGLE_BYTE_SLOTS; i++) |
253 | XSETFASTINT (XCHAR_TABLE (up)->contents[i], | |
254 | ((i >= 'A' && i <= 'Z') | |
255 | ? i + ('a' - 'A') | |
256 | : ((i >= 'a' && i <= 'z') | |
257 | ? i + ('A' - 'a') | |
258 | : i))); | |
7f7fef04 RS |
259 | |
260 | XCHAR_TABLE (down)->extras[2] = Fcopy_sequence (up); | |
dcfdbac7 JB |
261 | } |
262 | ||
dfcf069d | 263 | void |
dcfdbac7 JB |
264 | syms_of_casetab () |
265 | { | |
266 | Qcase_table_p = intern ("case-table-p"); | |
267 | staticpro (&Qcase_table_p); | |
7f7fef04 | 268 | |
8f84b1a1 | 269 | staticpro (&Vascii_canon_table); |
dcfdbac7 | 270 | staticpro (&Vascii_downcase_table); |
8f84b1a1 EN |
271 | staticpro (&Vascii_eqv_table); |
272 | staticpro (&Vascii_upcase_table); | |
dcfdbac7 JB |
273 | |
274 | defsubr (&Scase_table_p); | |
275 | defsubr (&Scurrent_case_table); | |
276 | defsubr (&Sstandard_case_table); | |
277 | defsubr (&Sset_case_table); | |
278 | defsubr (&Sset_standard_case_table); | |
dcfdbac7 | 279 | } |