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dcfdbac7 | 1 | /* GNU Emacs routines to deal with case tables. |
8deda4af GM |
2 | Copyright (C) 1993, 1994, 2001, 2002, 2003, 2004, 2005, 2006, 2007, |
3 | 2008, 2009 Free Software Foundation, Inc. | |
4 | ||
5 | Author: Howard Gayle | |
dcfdbac7 JB |
6 | |
7 | This file is part of GNU Emacs. | |
8 | ||
9ec0b715 | 9 | GNU Emacs is free software: you can redistribute it and/or modify |
dcfdbac7 | 10 | it under the terms of the GNU General Public License as published by |
9ec0b715 GM |
11 | the Free Software Foundation, either version 3 of the License, or |
12 | (at your option) any later version. | |
dcfdbac7 JB |
13 | |
14 | GNU Emacs is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
9ec0b715 | 20 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
dcfdbac7 | 21 | |
18160b98 | 22 | #include <config.h> |
dcfdbac7 JB |
23 | #include "lisp.h" |
24 | #include "buffer.h" | |
e961d439 | 25 | #include "character.h" |
dcfdbac7 | 26 | |
7f7fef04 | 27 | Lisp_Object Qcase_table_p, Qcase_table; |
dcfdbac7 JB |
28 | Lisp_Object Vascii_downcase_table, Vascii_upcase_table; |
29 | Lisp_Object Vascii_canon_table, Vascii_eqv_table; | |
30 | ||
da2795b2 KH |
31 | /* Used as a temporary in DOWNCASE and other macros in lisp.h. No |
32 | need to mark it, since it is used only very temporarily. */ | |
2e34157c RS |
33 | int case_temp1; |
34 | Lisp_Object case_temp2; | |
da2795b2 KH |
35 | |
36 | static void set_canon (); | |
37 | static void set_identity (); | |
38 | static void shuffle (); | |
dcfdbac7 JB |
39 | |
40 | DEFUN ("case-table-p", Fcase_table_p, Scase_table_p, 1, 1, 0, | |
e0f24100 | 41 | doc: /* Return t if OBJECT is a case table. |
fdb82f93 PJ |
42 | See `set-case-table' for more information on these data structures. */) |
43 | (object) | |
2858a1c1 | 44 | Lisp_Object object; |
dcfdbac7 | 45 | { |
4b3bd052 | 46 | Lisp_Object up, canon, eqv; |
dcfdbac7 | 47 | |
2858a1c1 | 48 | if (! CHAR_TABLE_P (object)) |
7f7fef04 | 49 | return Qnil; |
2858a1c1 | 50 | if (! EQ (XCHAR_TABLE (object)->purpose, Qcase_table)) |
7f7fef04 | 51 | return Qnil; |
dcfdbac7 | 52 | |
2858a1c1 EN |
53 | up = XCHAR_TABLE (object)->extras[0]; |
54 | canon = XCHAR_TABLE (object)->extras[1]; | |
55 | eqv = XCHAR_TABLE (object)->extras[2]; | |
7f7fef04 RS |
56 | |
57 | return ((NILP (up) || CHAR_TABLE_P (up)) | |
d427b66a | 58 | && ((NILP (canon) && NILP (eqv)) |
7f7fef04 RS |
59 | || (CHAR_TABLE_P (canon) |
60 | && (NILP (eqv) || CHAR_TABLE_P (eqv)))) | |
dcfdbac7 JB |
61 | ? Qt : Qnil); |
62 | } | |
63 | ||
64 | static Lisp_Object | |
65 | check_case_table (obj) | |
66 | Lisp_Object obj; | |
67 | { | |
a5f07f6d | 68 | CHECK_TYPE (!NILP (Fcase_table_p (obj)), Qcase_table_p, obj); |
dcfdbac7 | 69 | return (obj); |
177c0ea7 | 70 | } |
dcfdbac7 JB |
71 | |
72 | DEFUN ("current-case-table", Fcurrent_case_table, Scurrent_case_table, 0, 0, 0, | |
fdb82f93 PJ |
73 | doc: /* Return the case table of the current buffer. */) |
74 | () | |
dcfdbac7 | 75 | { |
7f7fef04 | 76 | return current_buffer->downcase_table; |
dcfdbac7 JB |
77 | } |
78 | ||
a1de6b4b | 79 | DEFUN ("standard-case-table", Fstandard_case_table, Sstandard_case_table, 0, 0, 0, |
fdb82f93 PJ |
80 | doc: /* Return the standard case table. |
81 | This is the one used for new buffers. */) | |
82 | () | |
dcfdbac7 | 83 | { |
7f7fef04 | 84 | return Vascii_downcase_table; |
dcfdbac7 JB |
85 | } |
86 | ||
d9da9451 JB |
87 | static Lisp_Object set_case_table (); |
88 | ||
dcfdbac7 | 89 | DEFUN ("set-case-table", Fset_case_table, Sset_case_table, 1, 1, 0, |
fdb82f93 PJ |
90 | doc: /* Select a new case table for the current buffer. |
91 | A case table is a char-table which maps characters | |
92 | to their lower-case equivalents. It also has three \"extra\" slots | |
93 | which may be additional char-tables or nil. | |
94 | These slots are called UPCASE, CANONICALIZE and EQUIVALENCES. | |
f6a18aa2 RS |
95 | UPCASE maps each non-upper-case character to its upper-case equivalent. |
96 | (The value in UPCASE for an upper-case character is never used.) | |
97 | If lower and upper case characters are in 1-1 correspondence, | |
fdb82f93 PJ |
98 | you may use nil and the upcase table will be deduced from DOWNCASE. |
99 | CANONICALIZE maps each character to a canonical equivalent; | |
100 | any two characters that are related by case-conversion have the same | |
101 | canonical equivalent character; it may be nil, in which case it is | |
102 | deduced from DOWNCASE and UPCASE. | |
103 | EQUIVALENCES is a map that cyclicly permutes each equivalence class | |
104 | (of characters with the same canonical equivalent); it may be nil, | |
105 | in which case it is deduced from CANONICALIZE. */) | |
106 | (table) | |
dcfdbac7 JB |
107 | Lisp_Object table; |
108 | { | |
d9da9451 | 109 | return set_case_table (table, 0); |
dcfdbac7 JB |
110 | } |
111 | ||
a1de6b4b | 112 | DEFUN ("set-standard-case-table", Fset_standard_case_table, Sset_standard_case_table, 1, 1, 0, |
fdb82f93 PJ |
113 | doc: /* Select a new standard case table for new buffers. |
114 | See `set-case-table' for more info on case tables. */) | |
115 | (table) | |
dcfdbac7 JB |
116 | Lisp_Object table; |
117 | { | |
d9da9451 | 118 | return set_case_table (table, 1); |
dcfdbac7 JB |
119 | } |
120 | ||
d9da9451 | 121 | static Lisp_Object |
dcfdbac7 JB |
122 | set_case_table (table, standard) |
123 | Lisp_Object table; | |
124 | int standard; | |
125 | { | |
4b3bd052 | 126 | Lisp_Object up, canon, eqv; |
dcfdbac7 JB |
127 | |
128 | check_case_table (table); | |
129 | ||
7f7fef04 RS |
130 | up = XCHAR_TABLE (table)->extras[0]; |
131 | canon = XCHAR_TABLE (table)->extras[1]; | |
132 | eqv = XCHAR_TABLE (table)->extras[2]; | |
dcfdbac7 | 133 | |
d427b66a | 134 | if (NILP (up)) |
dcfdbac7 | 135 | { |
7f7fef04 | 136 | up = Fmake_char_table (Qcase_table, Qnil); |
8f924df7 KH |
137 | map_char_table (set_identity, Qnil, table, up); |
138 | map_char_table (shuffle, Qnil, table, up); | |
7f7fef04 | 139 | XCHAR_TABLE (table)->extras[0] = up; |
dcfdbac7 JB |
140 | } |
141 | ||
d427b66a | 142 | if (NILP (canon)) |
dcfdbac7 | 143 | { |
4b3bd052 | 144 | canon = Fmake_char_table (Qcase_table, Qnil); |
7f7fef04 | 145 | XCHAR_TABLE (table)->extras[1] = canon; |
8f924df7 | 146 | map_char_table (set_canon, Qnil, table, table); |
5a0fd72f RS |
147 | } |
148 | ||
149 | if (NILP (eqv)) | |
150 | { | |
7f7fef04 | 151 | eqv = Fmake_char_table (Qcase_table, Qnil); |
8f924df7 KH |
152 | map_char_table (set_identity, Qnil, canon, eqv); |
153 | map_char_table (shuffle, Qnil, canon, eqv); | |
4b3bd052 | 154 | XCHAR_TABLE (table)->extras[2] = eqv; |
dcfdbac7 JB |
155 | } |
156 | ||
426f6c23 RS |
157 | /* This is so set_image_of_range_1 in regex.c can find the EQV table. */ |
158 | XCHAR_TABLE (canon)->extras[2] = eqv; | |
159 | ||
dcfdbac7 | 160 | if (standard) |
f79609dc KH |
161 | { |
162 | Vascii_downcase_table = table; | |
163 | Vascii_upcase_table = up; | |
164 | Vascii_canon_table = canon; | |
165 | Vascii_eqv_table = eqv; | |
166 | } | |
dcfdbac7 | 167 | else |
6c6fcbf8 RS |
168 | { |
169 | current_buffer->downcase_table = table; | |
170 | current_buffer->upcase_table = up; | |
171 | current_buffer->case_canon_table = canon; | |
172 | current_buffer->case_eqv_table = eqv; | |
173 | } | |
7f7fef04 | 174 | |
dcfdbac7 JB |
175 | return table; |
176 | } | |
177 | \f | |
da2795b2 KH |
178 | /* The following functions are called in map_char_table. */ |
179 | ||
8f924df7 KH |
180 | /* Set CANON char-table element for characters in RANGE to a |
181 | translated ELT by UP and DOWN char-tables. This is done only when | |
182 | ELT is a character. The char-tables CANON, UP, and DOWN are in | |
183 | CASE_TABLE. */ | |
e16696ba | 184 | |
c0c15b93 | 185 | static void |
e961d439 KH |
186 | set_canon (case_table, range, elt) |
187 | Lisp_Object case_table, range, elt; | |
c0c15b93 | 188 | { |
da2795b2 KH |
189 | Lisp_Object up = XCHAR_TABLE (case_table)->extras[0]; |
190 | Lisp_Object canon = XCHAR_TABLE (case_table)->extras[1]; | |
c0c15b93 | 191 | |
da2795b2 | 192 | if (NATNUMP (elt)) |
405b0b5a | 193 | Fset_char_table_range (canon, range, Faref (case_table, Faref (up, elt))); |
c0c15b93 | 194 | } |
dcfdbac7 | 195 | |
8f924df7 KH |
196 | /* Set elements of char-table TABLE for C to C itself. C may be a |
197 | cons specifying a character range. In that case, set characters in | |
198 | that range to themselves. This is done only when ELT is a | |
199 | character. This is called in map_char_table. */ | |
e16696ba | 200 | |
7f7fef04 | 201 | static void |
da2795b2 KH |
202 | set_identity (table, c, elt) |
203 | Lisp_Object table, c, elt; | |
dcfdbac7 | 204 | { |
da2795b2 | 205 | if (NATNUMP (elt)) |
e961d439 | 206 | { |
8f924df7 KH |
207 | int from, to; |
208 | ||
209 | if (CONSP (c)) | |
e961d439 | 210 | { |
8f924df7 KH |
211 | from = XINT (XCAR (c)); |
212 | to = XINT (XCDR (c)); | |
e961d439 KH |
213 | } |
214 | else | |
8f924df7 | 215 | from = to = XINT (c); |
e961d439 | 216 | for (; from <= to; from++) |
405b0b5a | 217 | CHAR_TABLE_SET (table, from, make_number (from)); |
e961d439 | 218 | } |
dcfdbac7 | 219 | } |
c0c15b93 | 220 | |
da2795b2 KH |
221 | /* Permute the elements of TABLE (which is initially an identity |
222 | mapping) so that it has one cycle for each equivalence class | |
223 | induced by the translation table on which map_char_table is | |
224 | operated. */ | |
c0c15b93 KH |
225 | |
226 | static void | |
da2795b2 KH |
227 | shuffle (table, c, elt) |
228 | Lisp_Object table, c, elt; | |
c0c15b93 | 229 | { |
e961d439 | 230 | if (NATNUMP (elt)) |
da2795b2 KH |
231 | { |
232 | Lisp_Object tem = Faref (table, elt); | |
8f924df7 | 233 | int from, to; |
e961d439 | 234 | |
8f924df7 | 235 | if (CONSP (c)) |
e961d439 | 236 | { |
8f924df7 KH |
237 | from = XINT (XCAR (c)); |
238 | to = XINT (XCDR (c)); | |
e961d439 KH |
239 | } |
240 | else | |
8f924df7 | 241 | from = to = XINT (c); |
e961d439 KH |
242 | |
243 | for (; from <= to; from++) | |
244 | if (from != XINT (elt)) | |
245 | { | |
e961d439 KH |
246 | Faset (table, elt, make_number (from)); |
247 | Faset (table, make_number (from), tem); | |
248 | } | |
da2795b2 | 249 | } |
c0c15b93 | 250 | } |
dcfdbac7 | 251 | \f |
dfcf069d | 252 | void |
dcfdbac7 JB |
253 | init_casetab_once () |
254 | { | |
255 | register int i; | |
7f7fef04 RS |
256 | Lisp_Object down, up; |
257 | Qcase_table = intern ("case-table"); | |
258 | staticpro (&Qcase_table); | |
259 | ||
260 | /* Intern this now in case it isn't already done. | |
261 | Setting this variable twice is harmless. | |
262 | But don't staticpro it here--that is done in alloc.c. */ | |
263 | Qchar_table_extra_slots = intern ("char-table-extra-slots"); | |
dcfdbac7 | 264 | |
7f7fef04 RS |
265 | /* Now we are ready to set up this property, so we can |
266 | create char tables. */ | |
4b3bd052 | 267 | Fput (Qcase_table, Qchar_table_extra_slots, make_number (3)); |
7f7fef04 RS |
268 | |
269 | down = Fmake_char_table (Qcase_table, Qnil); | |
270 | Vascii_downcase_table = down; | |
e1b490ca | 271 | XCHAR_TABLE (down)->purpose = Qcase_table; |
dcfdbac7 | 272 | |
e961d439 | 273 | for (i = 0; i < 128; i++) |
8f924df7 KH |
274 | { |
275 | int c = (i >= 'A' && i <= 'Z') ? i + ('a' - 'A') : i; | |
276 | CHAR_TABLE_SET (down, i, make_number (c)); | |
277 | } | |
7f7fef04 RS |
278 | |
279 | XCHAR_TABLE (down)->extras[1] = Fcopy_sequence (down); | |
dcfdbac7 | 280 | |
7f7fef04 RS |
281 | up = Fmake_char_table (Qcase_table, Qnil); |
282 | XCHAR_TABLE (down)->extras[0] = up; | |
dcfdbac7 | 283 | |
e961d439 | 284 | for (i = 0; i < 128; i++) |
8f924df7 KH |
285 | { |
286 | int c = ((i >= 'A' && i <= 'Z') ? i + ('a' - 'A') | |
287 | : ((i >= 'a' && i <= 'z') ? i + ('A' - 'a') | |
288 | : i));; | |
289 | CHAR_TABLE_SET (up, i, make_number (c)); | |
290 | } | |
7f7fef04 RS |
291 | |
292 | XCHAR_TABLE (down)->extras[2] = Fcopy_sequence (up); | |
66aa138d RS |
293 | |
294 | /* Fill in what isn't filled in. */ | |
295 | set_case_table (down, 1); | |
dcfdbac7 JB |
296 | } |
297 | ||
dfcf069d | 298 | void |
dcfdbac7 JB |
299 | syms_of_casetab () |
300 | { | |
301 | Qcase_table_p = intern ("case-table-p"); | |
302 | staticpro (&Qcase_table_p); | |
7f7fef04 | 303 | |
8f84b1a1 | 304 | staticpro (&Vascii_canon_table); |
dcfdbac7 | 305 | staticpro (&Vascii_downcase_table); |
8f84b1a1 EN |
306 | staticpro (&Vascii_eqv_table); |
307 | staticpro (&Vascii_upcase_table); | |
dcfdbac7 JB |
308 | |
309 | defsubr (&Scase_table_p); | |
310 | defsubr (&Scurrent_case_table); | |
311 | defsubr (&Sstandard_case_table); | |
312 | defsubr (&Sset_case_table); | |
313 | defsubr (&Sset_standard_case_table); | |
dcfdbac7 | 314 | } |
6b61353c KH |
315 | |
316 | /* arch-tag: e06388ad-99fe-40ec-ba67-9d010fcc4916 | |
317 | (do not change this comment) */ |