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dcfdbac7 | 1 | /* GNU Emacs routines to deal with case tables. |
8deda4af | 2 | Copyright (C) 1993, 1994, 2001, 2002, 2003, 2004, 2005, 2006, 2007, |
5df4f04c | 3 | 2008, 2009, 2010, 2011 Free Software Foundation, Inc. |
8deda4af GM |
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> |
d7306fe6 | 23 | #include <setjmp.h> |
dcfdbac7 JB |
24 | #include "lisp.h" |
25 | #include "buffer.h" | |
e961d439 | 26 | #include "character.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, | |
e0f24100 | 42 | doc: /* Return t if OBJECT is a case table. |
fdb82f93 PJ |
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 | { | |
a5f07f6d | 69 | CHECK_TYPE (!NILP (Fcase_table_p (obj)), Qcase_table_p, obj); |
dcfdbac7 | 70 | return (obj); |
177c0ea7 | 71 | } |
dcfdbac7 JB |
72 | |
73 | DEFUN ("current-case-table", Fcurrent_case_table, Scurrent_case_table, 0, 0, 0, | |
fdb82f93 PJ |
74 | doc: /* Return the case table of the current buffer. */) |
75 | () | |
dcfdbac7 | 76 | { |
7f7fef04 | 77 | return current_buffer->downcase_table; |
dcfdbac7 JB |
78 | } |
79 | ||
a1de6b4b | 80 | DEFUN ("standard-case-table", Fstandard_case_table, Sstandard_case_table, 0, 0, 0, |
fdb82f93 PJ |
81 | doc: /* Return the standard case table. |
82 | This is the one used for new buffers. */) | |
83 | () | |
dcfdbac7 | 84 | { |
7f7fef04 | 85 | return Vascii_downcase_table; |
dcfdbac7 JB |
86 | } |
87 | ||
d9da9451 JB |
88 | static Lisp_Object set_case_table (); |
89 | ||
dcfdbac7 | 90 | DEFUN ("set-case-table", Fset_case_table, Sset_case_table, 1, 1, 0, |
fdb82f93 PJ |
91 | doc: /* Select a new case table for the current buffer. |
92 | A case table is a char-table which maps characters | |
93 | to their lower-case equivalents. It also has three \"extra\" slots | |
94 | which may be additional char-tables or nil. | |
95 | These slots are called UPCASE, CANONICALIZE and EQUIVALENCES. | |
f6a18aa2 RS |
96 | UPCASE maps each non-upper-case character to its upper-case equivalent. |
97 | (The value in UPCASE for an upper-case character is never used.) | |
98 | If lower and upper case characters are in 1-1 correspondence, | |
fdb82f93 PJ |
99 | you may use nil and the upcase table will be deduced from DOWNCASE. |
100 | CANONICALIZE maps each character to a canonical equivalent; | |
101 | any two characters that are related by case-conversion have the same | |
102 | canonical equivalent character; it may be nil, in which case it is | |
103 | deduced from DOWNCASE and UPCASE. | |
104 | EQUIVALENCES is a map that cyclicly permutes each equivalence class | |
105 | (of characters with the same canonical equivalent); it may be nil, | |
106 | in which case it is deduced from CANONICALIZE. */) | |
107 | (table) | |
dcfdbac7 JB |
108 | Lisp_Object table; |
109 | { | |
d9da9451 | 110 | return set_case_table (table, 0); |
dcfdbac7 JB |
111 | } |
112 | ||
a1de6b4b | 113 | DEFUN ("set-standard-case-table", Fset_standard_case_table, Sset_standard_case_table, 1, 1, 0, |
fdb82f93 PJ |
114 | doc: /* Select a new standard case table for new buffers. |
115 | See `set-case-table' for more info on case tables. */) | |
116 | (table) | |
dcfdbac7 JB |
117 | Lisp_Object table; |
118 | { | |
d9da9451 | 119 | return set_case_table (table, 1); |
dcfdbac7 JB |
120 | } |
121 | ||
d9da9451 | 122 | static Lisp_Object |
dcfdbac7 JB |
123 | set_case_table (table, standard) |
124 | Lisp_Object table; | |
125 | int standard; | |
126 | { | |
4b3bd052 | 127 | Lisp_Object up, canon, eqv; |
dcfdbac7 JB |
128 | |
129 | check_case_table (table); | |
130 | ||
7f7fef04 RS |
131 | up = XCHAR_TABLE (table)->extras[0]; |
132 | canon = XCHAR_TABLE (table)->extras[1]; | |
133 | eqv = XCHAR_TABLE (table)->extras[2]; | |
dcfdbac7 | 134 | |
d427b66a | 135 | if (NILP (up)) |
dcfdbac7 | 136 | { |
7f7fef04 | 137 | up = Fmake_char_table (Qcase_table, Qnil); |
8f924df7 KH |
138 | map_char_table (set_identity, Qnil, table, up); |
139 | map_char_table (shuffle, Qnil, table, up); | |
7f7fef04 | 140 | XCHAR_TABLE (table)->extras[0] = up; |
dcfdbac7 JB |
141 | } |
142 | ||
d427b66a | 143 | if (NILP (canon)) |
dcfdbac7 | 144 | { |
4b3bd052 | 145 | canon = Fmake_char_table (Qcase_table, Qnil); |
7f7fef04 | 146 | XCHAR_TABLE (table)->extras[1] = canon; |
8f924df7 | 147 | map_char_table (set_canon, Qnil, table, table); |
5a0fd72f RS |
148 | } |
149 | ||
150 | if (NILP (eqv)) | |
151 | { | |
7f7fef04 | 152 | eqv = Fmake_char_table (Qcase_table, Qnil); |
8f924df7 KH |
153 | map_char_table (set_identity, Qnil, canon, eqv); |
154 | map_char_table (shuffle, Qnil, canon, eqv); | |
4b3bd052 | 155 | XCHAR_TABLE (table)->extras[2] = eqv; |
dcfdbac7 JB |
156 | } |
157 | ||
426f6c23 RS |
158 | /* This is so set_image_of_range_1 in regex.c can find the EQV table. */ |
159 | XCHAR_TABLE (canon)->extras[2] = eqv; | |
160 | ||
dcfdbac7 | 161 | if (standard) |
f79609dc KH |
162 | { |
163 | Vascii_downcase_table = table; | |
164 | Vascii_upcase_table = up; | |
165 | Vascii_canon_table = canon; | |
166 | Vascii_eqv_table = eqv; | |
167 | } | |
dcfdbac7 | 168 | else |
6c6fcbf8 RS |
169 | { |
170 | current_buffer->downcase_table = table; | |
171 | current_buffer->upcase_table = up; | |
172 | current_buffer->case_canon_table = canon; | |
173 | current_buffer->case_eqv_table = eqv; | |
174 | } | |
7f7fef04 | 175 | |
dcfdbac7 JB |
176 | return table; |
177 | } | |
178 | \f | |
da2795b2 KH |
179 | /* The following functions are called in map_char_table. */ |
180 | ||
8f924df7 KH |
181 | /* Set CANON char-table element for characters in RANGE to a |
182 | translated ELT by UP and DOWN char-tables. This is done only when | |
183 | ELT is a character. The char-tables CANON, UP, and DOWN are in | |
184 | CASE_TABLE. */ | |
e16696ba | 185 | |
c0c15b93 | 186 | static void |
e961d439 KH |
187 | set_canon (case_table, range, elt) |
188 | Lisp_Object case_table, range, elt; | |
c0c15b93 | 189 | { |
da2795b2 KH |
190 | Lisp_Object up = XCHAR_TABLE (case_table)->extras[0]; |
191 | Lisp_Object canon = XCHAR_TABLE (case_table)->extras[1]; | |
c0c15b93 | 192 | |
da2795b2 | 193 | if (NATNUMP (elt)) |
405b0b5a | 194 | Fset_char_table_range (canon, range, Faref (case_table, Faref (up, elt))); |
c0c15b93 | 195 | } |
dcfdbac7 | 196 | |
8f924df7 KH |
197 | /* Set elements of char-table TABLE for C to C itself. C may be a |
198 | cons specifying a character range. In that case, set characters in | |
199 | that range to themselves. This is done only when ELT is a | |
200 | character. This is called in map_char_table. */ | |
e16696ba | 201 | |
7f7fef04 | 202 | static void |
da2795b2 KH |
203 | set_identity (table, c, elt) |
204 | Lisp_Object table, c, elt; | |
dcfdbac7 | 205 | { |
da2795b2 | 206 | if (NATNUMP (elt)) |
e961d439 | 207 | { |
8f924df7 KH |
208 | int from, to; |
209 | ||
210 | if (CONSP (c)) | |
e961d439 | 211 | { |
8f924df7 KH |
212 | from = XINT (XCAR (c)); |
213 | to = XINT (XCDR (c)); | |
e961d439 KH |
214 | } |
215 | else | |
8f924df7 | 216 | from = to = XINT (c); |
e961d439 | 217 | for (; from <= to; from++) |
405b0b5a | 218 | CHAR_TABLE_SET (table, from, make_number (from)); |
e961d439 | 219 | } |
dcfdbac7 | 220 | } |
c0c15b93 | 221 | |
da2795b2 KH |
222 | /* Permute the elements of TABLE (which is initially an identity |
223 | mapping) so that it has one cycle for each equivalence class | |
224 | induced by the translation table on which map_char_table is | |
225 | operated. */ | |
c0c15b93 KH |
226 | |
227 | static void | |
da2795b2 KH |
228 | shuffle (table, c, elt) |
229 | Lisp_Object table, c, elt; | |
c0c15b93 | 230 | { |
e961d439 | 231 | if (NATNUMP (elt)) |
da2795b2 | 232 | { |
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++) | |
fa055055 KH |
244 | { |
245 | Lisp_Object tem = Faref (table, elt); | |
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 | 256 | Lisp_Object down, up; |
d67b4f80 | 257 | Qcase_table = intern_c_string ("case-table"); |
7f7fef04 RS |
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. */ | |
d67b4f80 | 263 | Qchar_table_extra_slots = intern_c_string ("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') | |
8510724d | 288 | : i)); |
8f924df7 KH |
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 | { | |
d67b4f80 | 301 | Qcase_table_p = intern_c_string ("case-table-p"); |
dcfdbac7 | 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) */ |