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dcfdbac7 | 1 | /* GNU Emacs routines to deal with case tables. |
ab422c4d | 2 | Copyright (C) 1993-1994, 2001-2013 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> |
0328b6de | 22 | |
dcfdbac7 | 23 | #include "lisp.h" |
e961d439 | 24 | #include "character.h" |
e5560ff7 | 25 | #include "buffer.h" |
dcfdbac7 | 26 | |
955cbe7b | 27 | static Lisp_Object Qcase_table_p, Qcase_table; |
31cd66f3 PE |
28 | Lisp_Object Vascii_downcase_table; |
29 | static Lisp_Object Vascii_upcase_table; | |
30 | Lisp_Object Vascii_canon_table; | |
31 | static Lisp_Object Vascii_eqv_table; | |
dcfdbac7 | 32 | |
971de7fb DN |
33 | static void set_canon (Lisp_Object case_table, Lisp_Object range, Lisp_Object elt); |
34 | static void set_identity (Lisp_Object table, Lisp_Object c, Lisp_Object elt); | |
35 | static void shuffle (Lisp_Object table, Lisp_Object c, Lisp_Object elt); | |
dcfdbac7 JB |
36 | |
37 | DEFUN ("case-table-p", Fcase_table_p, Scase_table_p, 1, 1, 0, | |
e0f24100 | 38 | doc: /* Return t if OBJECT is a case table. |
fdb82f93 | 39 | See `set-case-table' for more information on these data structures. */) |
5842a27b | 40 | (Lisp_Object object) |
dcfdbac7 | 41 | { |
4b3bd052 | 42 | Lisp_Object up, canon, eqv; |
dcfdbac7 | 43 | |
2858a1c1 | 44 | if (! CHAR_TABLE_P (object)) |
7f7fef04 | 45 | return Qnil; |
2858a1c1 | 46 | if (! EQ (XCHAR_TABLE (object)->purpose, Qcase_table)) |
7f7fef04 | 47 | return Qnil; |
dcfdbac7 | 48 | |
2858a1c1 EN |
49 | up = XCHAR_TABLE (object)->extras[0]; |
50 | canon = XCHAR_TABLE (object)->extras[1]; | |
51 | eqv = XCHAR_TABLE (object)->extras[2]; | |
7f7fef04 RS |
52 | |
53 | return ((NILP (up) || CHAR_TABLE_P (up)) | |
d427b66a | 54 | && ((NILP (canon) && NILP (eqv)) |
7f7fef04 RS |
55 | || (CHAR_TABLE_P (canon) |
56 | && (NILP (eqv) || CHAR_TABLE_P (eqv)))) | |
dcfdbac7 JB |
57 | ? Qt : Qnil); |
58 | } | |
59 | ||
60 | static Lisp_Object | |
971de7fb | 61 | check_case_table (Lisp_Object obj) |
dcfdbac7 | 62 | { |
a5f07f6d | 63 | CHECK_TYPE (!NILP (Fcase_table_p (obj)), Qcase_table_p, obj); |
dcfdbac7 | 64 | return (obj); |
177c0ea7 | 65 | } |
dcfdbac7 JB |
66 | |
67 | DEFUN ("current-case-table", Fcurrent_case_table, Scurrent_case_table, 0, 0, 0, | |
fdb82f93 | 68 | doc: /* Return the case table of the current buffer. */) |
5842a27b | 69 | (void) |
dcfdbac7 | 70 | { |
4b4deea2 | 71 | return BVAR (current_buffer, downcase_table); |
dcfdbac7 JB |
72 | } |
73 | ||
a1de6b4b | 74 | DEFUN ("standard-case-table", Fstandard_case_table, Sstandard_case_table, 0, 0, 0, |
fdb82f93 PJ |
75 | doc: /* Return the standard case table. |
76 | This is the one used for new buffers. */) | |
5842a27b | 77 | (void) |
dcfdbac7 | 78 | { |
7f7fef04 | 79 | return Vascii_downcase_table; |
dcfdbac7 JB |
80 | } |
81 | ||
17c05d74 | 82 | static Lisp_Object set_case_table (Lisp_Object, bool); |
d9da9451 | 83 | |
a7ca3326 | 84 | DEFUN ("set-case-table", Fset_case_table, Sset_case_table, 1, 1, 0, |
fdb82f93 PJ |
85 | doc: /* Select a new case table for the current buffer. |
86 | A case table is a char-table which maps characters | |
87 | to their lower-case equivalents. It also has three \"extra\" slots | |
88 | which may be additional char-tables or nil. | |
89 | These slots are called UPCASE, CANONICALIZE and EQUIVALENCES. | |
f6a18aa2 RS |
90 | UPCASE maps each non-upper-case character to its upper-case equivalent. |
91 | (The value in UPCASE for an upper-case character is never used.) | |
92 | If lower and upper case characters are in 1-1 correspondence, | |
fdb82f93 PJ |
93 | you may use nil and the upcase table will be deduced from DOWNCASE. |
94 | CANONICALIZE maps each character to a canonical equivalent; | |
95 | any two characters that are related by case-conversion have the same | |
96 | canonical equivalent character; it may be nil, in which case it is | |
97 | deduced from DOWNCASE and UPCASE. | |
cd1181db | 98 | EQUIVALENCES is a map that cyclically permutes each equivalence class |
fdb82f93 PJ |
99 | (of characters with the same canonical equivalent); it may be nil, |
100 | in which case it is deduced from CANONICALIZE. */) | |
5842a27b | 101 | (Lisp_Object table) |
dcfdbac7 | 102 | { |
d9da9451 | 103 | return set_case_table (table, 0); |
dcfdbac7 JB |
104 | } |
105 | ||
a7ca3326 | 106 | DEFUN ("set-standard-case-table", Fset_standard_case_table, |
16a97296 | 107 | Sset_standard_case_table, 1, 1, 0, |
fdb82f93 PJ |
108 | doc: /* Select a new standard case table for new buffers. |
109 | See `set-case-table' for more info on case tables. */) | |
5842a27b | 110 | (Lisp_Object table) |
dcfdbac7 | 111 | { |
d9da9451 | 112 | return set_case_table (table, 1); |
dcfdbac7 JB |
113 | } |
114 | ||
d9da9451 | 115 | static Lisp_Object |
17c05d74 | 116 | set_case_table (Lisp_Object table, bool standard) |
dcfdbac7 | 117 | { |
4b3bd052 | 118 | Lisp_Object up, canon, eqv; |
dcfdbac7 JB |
119 | |
120 | check_case_table (table); | |
121 | ||
7f7fef04 RS |
122 | up = XCHAR_TABLE (table)->extras[0]; |
123 | canon = XCHAR_TABLE (table)->extras[1]; | |
124 | eqv = XCHAR_TABLE (table)->extras[2]; | |
dcfdbac7 | 125 | |
d427b66a | 126 | if (NILP (up)) |
dcfdbac7 | 127 | { |
7f7fef04 | 128 | up = Fmake_char_table (Qcase_table, Qnil); |
8f924df7 KH |
129 | map_char_table (set_identity, Qnil, table, up); |
130 | map_char_table (shuffle, Qnil, table, up); | |
34dabdb7 | 131 | set_char_table_extras (table, 0, up); |
dcfdbac7 JB |
132 | } |
133 | ||
d427b66a | 134 | if (NILP (canon)) |
dcfdbac7 | 135 | { |
4b3bd052 | 136 | canon = Fmake_char_table (Qcase_table, Qnil); |
34dabdb7 | 137 | set_char_table_extras (table, 1, canon); |
8f924df7 | 138 | map_char_table (set_canon, Qnil, table, table); |
5a0fd72f RS |
139 | } |
140 | ||
141 | if (NILP (eqv)) | |
142 | { | |
7f7fef04 | 143 | eqv = Fmake_char_table (Qcase_table, Qnil); |
8f924df7 KH |
144 | map_char_table (set_identity, Qnil, canon, eqv); |
145 | map_char_table (shuffle, Qnil, canon, eqv); | |
34dabdb7 | 146 | set_char_table_extras (table, 2, eqv); |
dcfdbac7 JB |
147 | } |
148 | ||
426f6c23 | 149 | /* This is so set_image_of_range_1 in regex.c can find the EQV table. */ |
34dabdb7 | 150 | set_char_table_extras (canon, 2, eqv); |
426f6c23 | 151 | |
dcfdbac7 | 152 | if (standard) |
f79609dc KH |
153 | { |
154 | Vascii_downcase_table = table; | |
155 | Vascii_upcase_table = up; | |
156 | Vascii_canon_table = canon; | |
157 | Vascii_eqv_table = eqv; | |
158 | } | |
dcfdbac7 | 159 | else |
6c6fcbf8 | 160 | { |
39eb03f1 PE |
161 | bset_downcase_table (current_buffer, table); |
162 | bset_upcase_table (current_buffer, up); | |
163 | bset_case_canon_table (current_buffer, canon); | |
164 | bset_case_eqv_table (current_buffer, eqv); | |
6c6fcbf8 | 165 | } |
7f7fef04 | 166 | |
dcfdbac7 JB |
167 | return table; |
168 | } | |
169 | \f | |
da2795b2 KH |
170 | /* The following functions are called in map_char_table. */ |
171 | ||
8f924df7 KH |
172 | /* Set CANON char-table element for characters in RANGE to a |
173 | translated ELT by UP and DOWN char-tables. This is done only when | |
174 | ELT is a character. The char-tables CANON, UP, and DOWN are in | |
175 | CASE_TABLE. */ | |
e16696ba | 176 | |
c0c15b93 | 177 | static void |
971de7fb | 178 | set_canon (Lisp_Object case_table, Lisp_Object range, Lisp_Object elt) |
c0c15b93 | 179 | { |
da2795b2 KH |
180 | Lisp_Object up = XCHAR_TABLE (case_table)->extras[0]; |
181 | Lisp_Object canon = XCHAR_TABLE (case_table)->extras[1]; | |
c0c15b93 | 182 | |
da2795b2 | 183 | if (NATNUMP (elt)) |
405b0b5a | 184 | Fset_char_table_range (canon, range, Faref (case_table, Faref (up, elt))); |
c0c15b93 | 185 | } |
dcfdbac7 | 186 | |
8f924df7 KH |
187 | /* Set elements of char-table TABLE for C to C itself. C may be a |
188 | cons specifying a character range. In that case, set characters in | |
189 | that range to themselves. This is done only when ELT is a | |
190 | character. This is called in map_char_table. */ | |
e16696ba | 191 | |
7f7fef04 | 192 | static void |
971de7fb | 193 | set_identity (Lisp_Object table, Lisp_Object c, Lisp_Object elt) |
dcfdbac7 | 194 | { |
da2795b2 | 195 | if (NATNUMP (elt)) |
e961d439 | 196 | { |
45c2afd6 | 197 | int from, to; |
8f924df7 KH |
198 | |
199 | if (CONSP (c)) | |
e961d439 | 200 | { |
8f924df7 KH |
201 | from = XINT (XCAR (c)); |
202 | to = XINT (XCDR (c)); | |
e961d439 KH |
203 | } |
204 | else | |
8f924df7 | 205 | from = to = XINT (c); |
45c2afd6 PE |
206 | |
207 | to++; | |
208 | lint_assume (to <= MAX_CHAR + 1); | |
209 | for (; from < to; from++) | |
405b0b5a | 210 | CHAR_TABLE_SET (table, from, make_number (from)); |
e961d439 | 211 | } |
dcfdbac7 | 212 | } |
c0c15b93 | 213 | |
da2795b2 KH |
214 | /* Permute the elements of TABLE (which is initially an identity |
215 | mapping) so that it has one cycle for each equivalence class | |
216 | induced by the translation table on which map_char_table is | |
217 | operated. */ | |
c0c15b93 KH |
218 | |
219 | static void | |
971de7fb | 220 | shuffle (Lisp_Object table, Lisp_Object c, Lisp_Object elt) |
c0c15b93 | 221 | { |
e961d439 | 222 | if (NATNUMP (elt)) |
da2795b2 | 223 | { |
d311d28c | 224 | int from, to; |
e961d439 | 225 | |
8f924df7 | 226 | if (CONSP (c)) |
e961d439 | 227 | { |
8f924df7 KH |
228 | from = XINT (XCAR (c)); |
229 | to = XINT (XCDR (c)); | |
e961d439 KH |
230 | } |
231 | else | |
8f924df7 | 232 | from = to = XINT (c); |
e961d439 | 233 | |
45c2afd6 PE |
234 | to++; |
235 | lint_assume (to <= MAX_CHAR + 1); | |
236 | for (; from < to; from++) | |
fa055055 KH |
237 | { |
238 | Lisp_Object tem = Faref (table, elt); | |
239 | Faset (table, elt, make_number (from)); | |
240 | Faset (table, make_number (from), tem); | |
241 | } | |
da2795b2 | 242 | } |
c0c15b93 | 243 | } |
dcfdbac7 | 244 | \f |
dfcf069d | 245 | void |
971de7fb | 246 | init_casetab_once (void) |
dcfdbac7 JB |
247 | { |
248 | register int i; | |
7f7fef04 | 249 | Lisp_Object down, up; |
cd3520a4 | 250 | DEFSYM (Qcase_table, "case-table"); |
7f7fef04 RS |
251 | |
252 | /* Intern this now in case it isn't already done. | |
253 | Setting this variable twice is harmless. | |
254 | But don't staticpro it here--that is done in alloc.c. */ | |
d67b4f80 | 255 | Qchar_table_extra_slots = intern_c_string ("char-table-extra-slots"); |
dcfdbac7 | 256 | |
7f7fef04 RS |
257 | /* Now we are ready to set up this property, so we can |
258 | create char tables. */ | |
4b3bd052 | 259 | Fput (Qcase_table, Qchar_table_extra_slots, make_number (3)); |
7f7fef04 RS |
260 | |
261 | down = Fmake_char_table (Qcase_table, Qnil); | |
262 | Vascii_downcase_table = down; | |
742af32f | 263 | set_char_table_purpose (down, Qcase_table); |
dcfdbac7 | 264 | |
e961d439 | 265 | for (i = 0; i < 128; i++) |
8f924df7 KH |
266 | { |
267 | int c = (i >= 'A' && i <= 'Z') ? i + ('a' - 'A') : i; | |
268 | CHAR_TABLE_SET (down, i, make_number (c)); | |
269 | } | |
7f7fef04 | 270 | |
34dabdb7 | 271 | set_char_table_extras (down, 1, Fcopy_sequence (down)); |
dcfdbac7 | 272 | |
7f7fef04 | 273 | up = Fmake_char_table (Qcase_table, Qnil); |
34dabdb7 | 274 | set_char_table_extras (down, 0, up); |
dcfdbac7 | 275 | |
e961d439 | 276 | for (i = 0; i < 128; i++) |
8f924df7 KH |
277 | { |
278 | int c = ((i >= 'A' && i <= 'Z') ? i + ('a' - 'A') | |
279 | : ((i >= 'a' && i <= 'z') ? i + ('A' - 'a') | |
8510724d | 280 | : i)); |
8f924df7 KH |
281 | CHAR_TABLE_SET (up, i, make_number (c)); |
282 | } | |
7f7fef04 | 283 | |
34dabdb7 | 284 | set_char_table_extras (down, 2, Fcopy_sequence (up)); |
66aa138d RS |
285 | |
286 | /* Fill in what isn't filled in. */ | |
287 | set_case_table (down, 1); | |
dcfdbac7 JB |
288 | } |
289 | ||
dfcf069d | 290 | void |
971de7fb | 291 | syms_of_casetab (void) |
dcfdbac7 | 292 | { |
cd3520a4 | 293 | DEFSYM (Qcase_table_p, "case-table-p"); |
7f7fef04 | 294 | |
8f84b1a1 | 295 | staticpro (&Vascii_canon_table); |
dcfdbac7 | 296 | staticpro (&Vascii_downcase_table); |
8f84b1a1 EN |
297 | staticpro (&Vascii_eqv_table); |
298 | staticpro (&Vascii_upcase_table); | |
dcfdbac7 JB |
299 | |
300 | defsubr (&Scase_table_p); | |
301 | defsubr (&Scurrent_case_table); | |
302 | defsubr (&Sstandard_case_table); | |
303 | defsubr (&Sset_case_table); | |
304 | defsubr (&Sset_standard_case_table); | |
dcfdbac7 | 305 | } |