Commit | Line | Data |
---|---|---|
dcfdbac7 | 1 | /* GNU Emacs routines to deal with case tables. |
73b0cd50 | 2 | Copyright (C) 1993-1994, 2001-2011 Free Software Foundation, Inc. |
8deda4af GM |
3 | |
4 | Author: Howard Gayle | |
dcfdbac7 JB |
5 | |
6 | This file is part of GNU Emacs. | |
7 | ||
9ec0b715 | 8 | GNU Emacs is free software: you can redistribute it and/or modify |
dcfdbac7 | 9 | it under the terms of the GNU General Public License as published by |
9ec0b715 GM |
10 | the Free Software Foundation, either version 3 of the License, or |
11 | (at your option) any later version. | |
dcfdbac7 JB |
12 | |
13 | GNU Emacs is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
9ec0b715 | 19 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
dcfdbac7 | 20 | |
18160b98 | 21 | #include <config.h> |
d7306fe6 | 22 | #include <setjmp.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 | ||
971de7fb DN |
31 | static void set_canon (Lisp_Object case_table, Lisp_Object range, Lisp_Object elt); |
32 | static void set_identity (Lisp_Object table, Lisp_Object c, Lisp_Object elt); | |
33 | static void shuffle (Lisp_Object table, Lisp_Object c, Lisp_Object elt); | |
dcfdbac7 JB |
34 | |
35 | DEFUN ("case-table-p", Fcase_table_p, Scase_table_p, 1, 1, 0, | |
e0f24100 | 36 | doc: /* Return t if OBJECT is a case table. |
fdb82f93 | 37 | See `set-case-table' for more information on these data structures. */) |
5842a27b | 38 | (Lisp_Object object) |
dcfdbac7 | 39 | { |
4b3bd052 | 40 | Lisp_Object up, canon, eqv; |
dcfdbac7 | 41 | |
2858a1c1 | 42 | if (! CHAR_TABLE_P (object)) |
7f7fef04 | 43 | return Qnil; |
2858a1c1 | 44 | if (! EQ (XCHAR_TABLE (object)->purpose, Qcase_table)) |
7f7fef04 | 45 | return Qnil; |
dcfdbac7 | 46 | |
2858a1c1 EN |
47 | up = XCHAR_TABLE (object)->extras[0]; |
48 | canon = XCHAR_TABLE (object)->extras[1]; | |
49 | eqv = XCHAR_TABLE (object)->extras[2]; | |
7f7fef04 RS |
50 | |
51 | return ((NILP (up) || CHAR_TABLE_P (up)) | |
d427b66a | 52 | && ((NILP (canon) && NILP (eqv)) |
7f7fef04 RS |
53 | || (CHAR_TABLE_P (canon) |
54 | && (NILP (eqv) || CHAR_TABLE_P (eqv)))) | |
dcfdbac7 JB |
55 | ? Qt : Qnil); |
56 | } | |
57 | ||
58 | static Lisp_Object | |
971de7fb | 59 | check_case_table (Lisp_Object obj) |
dcfdbac7 | 60 | { |
a5f07f6d | 61 | CHECK_TYPE (!NILP (Fcase_table_p (obj)), Qcase_table_p, obj); |
dcfdbac7 | 62 | return (obj); |
177c0ea7 | 63 | } |
dcfdbac7 JB |
64 | |
65 | DEFUN ("current-case-table", Fcurrent_case_table, Scurrent_case_table, 0, 0, 0, | |
fdb82f93 | 66 | doc: /* Return the case table of the current buffer. */) |
5842a27b | 67 | (void) |
dcfdbac7 | 68 | { |
4b4deea2 | 69 | return BVAR (current_buffer, downcase_table); |
dcfdbac7 JB |
70 | } |
71 | ||
a1de6b4b | 72 | DEFUN ("standard-case-table", Fstandard_case_table, Sstandard_case_table, 0, 0, 0, |
fdb82f93 PJ |
73 | doc: /* Return the standard case table. |
74 | This is the one used for new buffers. */) | |
5842a27b | 75 | (void) |
dcfdbac7 | 76 | { |
7f7fef04 | 77 | return Vascii_downcase_table; |
dcfdbac7 JB |
78 | } |
79 | ||
971de7fb | 80 | static Lisp_Object set_case_table (Lisp_Object table, int standard); |
d9da9451 | 81 | |
dcfdbac7 | 82 | DEFUN ("set-case-table", Fset_case_table, Sset_case_table, 1, 1, 0, |
fdb82f93 PJ |
83 | doc: /* Select a new case table for the current buffer. |
84 | A case table is a char-table which maps characters | |
85 | to their lower-case equivalents. It also has three \"extra\" slots | |
86 | which may be additional char-tables or nil. | |
87 | These slots are called UPCASE, CANONICALIZE and EQUIVALENCES. | |
f6a18aa2 RS |
88 | UPCASE maps each non-upper-case character to its upper-case equivalent. |
89 | (The value in UPCASE for an upper-case character is never used.) | |
90 | If lower and upper case characters are in 1-1 correspondence, | |
fdb82f93 PJ |
91 | you may use nil and the upcase table will be deduced from DOWNCASE. |
92 | CANONICALIZE maps each character to a canonical equivalent; | |
93 | any two characters that are related by case-conversion have the same | |
94 | canonical equivalent character; it may be nil, in which case it is | |
95 | deduced from DOWNCASE and UPCASE. | |
96 | EQUIVALENCES is a map that cyclicly permutes each equivalence class | |
97 | (of characters with the same canonical equivalent); it may be nil, | |
98 | in which case it is deduced from CANONICALIZE. */) | |
5842a27b | 99 | (Lisp_Object table) |
dcfdbac7 | 100 | { |
d9da9451 | 101 | return set_case_table (table, 0); |
dcfdbac7 JB |
102 | } |
103 | ||
a1de6b4b | 104 | DEFUN ("set-standard-case-table", Fset_standard_case_table, Sset_standard_case_table, 1, 1, 0, |
fdb82f93 PJ |
105 | doc: /* Select a new standard case table for new buffers. |
106 | See `set-case-table' for more info on case tables. */) | |
5842a27b | 107 | (Lisp_Object table) |
dcfdbac7 | 108 | { |
d9da9451 | 109 | return set_case_table (table, 1); |
dcfdbac7 JB |
110 | } |
111 | ||
d9da9451 | 112 | static Lisp_Object |
971de7fb | 113 | set_case_table (Lisp_Object table, int standard) |
dcfdbac7 | 114 | { |
4b3bd052 | 115 | Lisp_Object up, canon, eqv; |
dcfdbac7 JB |
116 | |
117 | check_case_table (table); | |
118 | ||
7f7fef04 RS |
119 | up = XCHAR_TABLE (table)->extras[0]; |
120 | canon = XCHAR_TABLE (table)->extras[1]; | |
121 | eqv = XCHAR_TABLE (table)->extras[2]; | |
dcfdbac7 | 122 | |
d427b66a | 123 | if (NILP (up)) |
dcfdbac7 | 124 | { |
7f7fef04 | 125 | up = Fmake_char_table (Qcase_table, Qnil); |
8f924df7 KH |
126 | map_char_table (set_identity, Qnil, table, up); |
127 | map_char_table (shuffle, Qnil, table, up); | |
7f7fef04 | 128 | XCHAR_TABLE (table)->extras[0] = up; |
dcfdbac7 JB |
129 | } |
130 | ||
d427b66a | 131 | if (NILP (canon)) |
dcfdbac7 | 132 | { |
4b3bd052 | 133 | canon = Fmake_char_table (Qcase_table, Qnil); |
7f7fef04 | 134 | XCHAR_TABLE (table)->extras[1] = canon; |
8f924df7 | 135 | map_char_table (set_canon, Qnil, table, table); |
5a0fd72f RS |
136 | } |
137 | ||
138 | if (NILP (eqv)) | |
139 | { | |
7f7fef04 | 140 | eqv = Fmake_char_table (Qcase_table, Qnil); |
8f924df7 KH |
141 | map_char_table (set_identity, Qnil, canon, eqv); |
142 | map_char_table (shuffle, Qnil, canon, eqv); | |
4b3bd052 | 143 | XCHAR_TABLE (table)->extras[2] = eqv; |
dcfdbac7 JB |
144 | } |
145 | ||
426f6c23 RS |
146 | /* This is so set_image_of_range_1 in regex.c can find the EQV table. */ |
147 | XCHAR_TABLE (canon)->extras[2] = eqv; | |
148 | ||
dcfdbac7 | 149 | if (standard) |
f79609dc KH |
150 | { |
151 | Vascii_downcase_table = table; | |
152 | Vascii_upcase_table = up; | |
153 | Vascii_canon_table = canon; | |
154 | Vascii_eqv_table = eqv; | |
155 | } | |
dcfdbac7 | 156 | else |
6c6fcbf8 | 157 | { |
4b4deea2 TT |
158 | BVAR (current_buffer, downcase_table) = table; |
159 | BVAR (current_buffer, upcase_table) = up; | |
160 | BVAR (current_buffer, case_canon_table) = canon; | |
161 | BVAR (current_buffer, case_eqv_table) = eqv; | |
6c6fcbf8 | 162 | } |
7f7fef04 | 163 | |
dcfdbac7 JB |
164 | return table; |
165 | } | |
166 | \f | |
da2795b2 KH |
167 | /* The following functions are called in map_char_table. */ |
168 | ||
8f924df7 KH |
169 | /* Set CANON char-table element for characters in RANGE to a |
170 | translated ELT by UP and DOWN char-tables. This is done only when | |
171 | ELT is a character. The char-tables CANON, UP, and DOWN are in | |
172 | CASE_TABLE. */ | |
e16696ba | 173 | |
c0c15b93 | 174 | static void |
971de7fb | 175 | set_canon (Lisp_Object case_table, Lisp_Object range, Lisp_Object elt) |
c0c15b93 | 176 | { |
da2795b2 KH |
177 | Lisp_Object up = XCHAR_TABLE (case_table)->extras[0]; |
178 | Lisp_Object canon = XCHAR_TABLE (case_table)->extras[1]; | |
c0c15b93 | 179 | |
da2795b2 | 180 | if (NATNUMP (elt)) |
405b0b5a | 181 | Fset_char_table_range (canon, range, Faref (case_table, Faref (up, elt))); |
c0c15b93 | 182 | } |
dcfdbac7 | 183 | |
8f924df7 KH |
184 | /* Set elements of char-table TABLE for C to C itself. C may be a |
185 | cons specifying a character range. In that case, set characters in | |
186 | that range to themselves. This is done only when ELT is a | |
187 | character. This is called in map_char_table. */ | |
e16696ba | 188 | |
7f7fef04 | 189 | static void |
971de7fb | 190 | set_identity (Lisp_Object table, Lisp_Object c, Lisp_Object elt) |
dcfdbac7 | 191 | { |
da2795b2 | 192 | if (NATNUMP (elt)) |
e961d439 | 193 | { |
f9a68bc5 PE |
194 | int from; |
195 | unsigned to; | |
8f924df7 KH |
196 | |
197 | if (CONSP (c)) | |
e961d439 | 198 | { |
8f924df7 KH |
199 | from = XINT (XCAR (c)); |
200 | to = XINT (XCDR (c)); | |
e961d439 KH |
201 | } |
202 | else | |
8f924df7 | 203 | from = to = XINT (c); |
f9a68bc5 | 204 | for (to++; from < to; from++) |
405b0b5a | 205 | CHAR_TABLE_SET (table, from, make_number (from)); |
e961d439 | 206 | } |
dcfdbac7 | 207 | } |
c0c15b93 | 208 | |
da2795b2 KH |
209 | /* Permute the elements of TABLE (which is initially an identity |
210 | mapping) so that it has one cycle for each equivalence class | |
211 | induced by the translation table on which map_char_table is | |
212 | operated. */ | |
c0c15b93 KH |
213 | |
214 | static void | |
971de7fb | 215 | shuffle (Lisp_Object table, Lisp_Object c, Lisp_Object elt) |
c0c15b93 | 216 | { |
e961d439 | 217 | if (NATNUMP (elt)) |
da2795b2 | 218 | { |
f9a68bc5 PE |
219 | int from; |
220 | unsigned to; | |
e961d439 | 221 | |
8f924df7 | 222 | if (CONSP (c)) |
e961d439 | 223 | { |
8f924df7 KH |
224 | from = XINT (XCAR (c)); |
225 | to = XINT (XCDR (c)); | |
e961d439 KH |
226 | } |
227 | else | |
8f924df7 | 228 | from = to = XINT (c); |
e961d439 | 229 | |
f9a68bc5 | 230 | for (to++; from < to; from++) |
fa055055 KH |
231 | { |
232 | Lisp_Object tem = Faref (table, elt); | |
233 | Faset (table, elt, make_number (from)); | |
234 | Faset (table, make_number (from), tem); | |
235 | } | |
da2795b2 | 236 | } |
c0c15b93 | 237 | } |
dcfdbac7 | 238 | \f |
dfcf069d | 239 | void |
971de7fb | 240 | init_casetab_once (void) |
dcfdbac7 JB |
241 | { |
242 | register int i; | |
7f7fef04 | 243 | Lisp_Object down, up; |
d67b4f80 | 244 | Qcase_table = intern_c_string ("case-table"); |
7f7fef04 RS |
245 | staticpro (&Qcase_table); |
246 | ||
247 | /* Intern this now in case it isn't already done. | |
248 | Setting this variable twice is harmless. | |
249 | But don't staticpro it here--that is done in alloc.c. */ | |
d67b4f80 | 250 | Qchar_table_extra_slots = intern_c_string ("char-table-extra-slots"); |
dcfdbac7 | 251 | |
7f7fef04 RS |
252 | /* Now we are ready to set up this property, so we can |
253 | create char tables. */ | |
4b3bd052 | 254 | Fput (Qcase_table, Qchar_table_extra_slots, make_number (3)); |
7f7fef04 RS |
255 | |
256 | down = Fmake_char_table (Qcase_table, Qnil); | |
257 | Vascii_downcase_table = down; | |
e1b490ca | 258 | XCHAR_TABLE (down)->purpose = Qcase_table; |
dcfdbac7 | 259 | |
e961d439 | 260 | for (i = 0; i < 128; i++) |
8f924df7 KH |
261 | { |
262 | int c = (i >= 'A' && i <= 'Z') ? i + ('a' - 'A') : i; | |
263 | CHAR_TABLE_SET (down, i, make_number (c)); | |
264 | } | |
7f7fef04 RS |
265 | |
266 | XCHAR_TABLE (down)->extras[1] = Fcopy_sequence (down); | |
dcfdbac7 | 267 | |
7f7fef04 RS |
268 | up = Fmake_char_table (Qcase_table, Qnil); |
269 | XCHAR_TABLE (down)->extras[0] = up; | |
dcfdbac7 | 270 | |
e961d439 | 271 | for (i = 0; i < 128; i++) |
8f924df7 KH |
272 | { |
273 | int c = ((i >= 'A' && i <= 'Z') ? i + ('a' - 'A') | |
274 | : ((i >= 'a' && i <= 'z') ? i + ('A' - 'a') | |
8510724d | 275 | : i)); |
8f924df7 KH |
276 | CHAR_TABLE_SET (up, i, make_number (c)); |
277 | } | |
7f7fef04 RS |
278 | |
279 | XCHAR_TABLE (down)->extras[2] = Fcopy_sequence (up); | |
66aa138d RS |
280 | |
281 | /* Fill in what isn't filled in. */ | |
282 | set_case_table (down, 1); | |
dcfdbac7 JB |
283 | } |
284 | ||
dfcf069d | 285 | void |
971de7fb | 286 | syms_of_casetab (void) |
dcfdbac7 | 287 | { |
d67b4f80 | 288 | Qcase_table_p = intern_c_string ("case-table-p"); |
dcfdbac7 | 289 | staticpro (&Qcase_table_p); |
7f7fef04 | 290 | |
8f84b1a1 | 291 | staticpro (&Vascii_canon_table); |
dcfdbac7 | 292 | staticpro (&Vascii_downcase_table); |
8f84b1a1 EN |
293 | staticpro (&Vascii_eqv_table); |
294 | staticpro (&Vascii_upcase_table); | |
dcfdbac7 JB |
295 | |
296 | defsubr (&Scase_table_p); | |
297 | defsubr (&Scurrent_case_table); | |
298 | defsubr (&Sstandard_case_table); | |
299 | defsubr (&Sset_case_table); | |
300 | defsubr (&Sset_standard_case_table); | |
dcfdbac7 | 301 | } |