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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, |
114f9c96 | 3 | 2008, 2009, 2010 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 | 36 | |
971de7fb DN |
37 | static void set_canon (Lisp_Object case_table, Lisp_Object range, Lisp_Object elt); |
38 | static void set_identity (Lisp_Object table, Lisp_Object c, Lisp_Object elt); | |
39 | static void shuffle (Lisp_Object table, Lisp_Object c, Lisp_Object elt); | |
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 | |
971de7fb | 66 | check_case_table (Lisp_Object obj) |
dcfdbac7 | 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 | ||
971de7fb | 87 | static Lisp_Object set_case_table (Lisp_Object table, int standard); |
d9da9451 | 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 |
971de7fb | 122 | set_case_table (Lisp_Object table, int standard) |
dcfdbac7 | 123 | { |
4b3bd052 | 124 | Lisp_Object up, canon, eqv; |
dcfdbac7 JB |
125 | |
126 | check_case_table (table); | |
127 | ||
7f7fef04 RS |
128 | up = XCHAR_TABLE (table)->extras[0]; |
129 | canon = XCHAR_TABLE (table)->extras[1]; | |
130 | eqv = XCHAR_TABLE (table)->extras[2]; | |
dcfdbac7 | 131 | |
d427b66a | 132 | if (NILP (up)) |
dcfdbac7 | 133 | { |
7f7fef04 | 134 | up = Fmake_char_table (Qcase_table, Qnil); |
8f924df7 KH |
135 | map_char_table (set_identity, Qnil, table, up); |
136 | map_char_table (shuffle, Qnil, table, up); | |
7f7fef04 | 137 | XCHAR_TABLE (table)->extras[0] = up; |
dcfdbac7 JB |
138 | } |
139 | ||
d427b66a | 140 | if (NILP (canon)) |
dcfdbac7 | 141 | { |
4b3bd052 | 142 | canon = Fmake_char_table (Qcase_table, Qnil); |
7f7fef04 | 143 | XCHAR_TABLE (table)->extras[1] = canon; |
8f924df7 | 144 | map_char_table (set_canon, Qnil, table, table); |
5a0fd72f RS |
145 | } |
146 | ||
147 | if (NILP (eqv)) | |
148 | { | |
7f7fef04 | 149 | eqv = Fmake_char_table (Qcase_table, Qnil); |
8f924df7 KH |
150 | map_char_table (set_identity, Qnil, canon, eqv); |
151 | map_char_table (shuffle, Qnil, canon, eqv); | |
4b3bd052 | 152 | XCHAR_TABLE (table)->extras[2] = eqv; |
dcfdbac7 JB |
153 | } |
154 | ||
426f6c23 RS |
155 | /* This is so set_image_of_range_1 in regex.c can find the EQV table. */ |
156 | XCHAR_TABLE (canon)->extras[2] = eqv; | |
157 | ||
dcfdbac7 | 158 | if (standard) |
f79609dc KH |
159 | { |
160 | Vascii_downcase_table = table; | |
161 | Vascii_upcase_table = up; | |
162 | Vascii_canon_table = canon; | |
163 | Vascii_eqv_table = eqv; | |
164 | } | |
dcfdbac7 | 165 | else |
6c6fcbf8 RS |
166 | { |
167 | current_buffer->downcase_table = table; | |
168 | current_buffer->upcase_table = up; | |
169 | current_buffer->case_canon_table = canon; | |
170 | current_buffer->case_eqv_table = eqv; | |
171 | } | |
7f7fef04 | 172 | |
dcfdbac7 JB |
173 | return table; |
174 | } | |
175 | \f | |
da2795b2 KH |
176 | /* The following functions are called in map_char_table. */ |
177 | ||
8f924df7 KH |
178 | /* Set CANON char-table element for characters in RANGE to a |
179 | translated ELT by UP and DOWN char-tables. This is done only when | |
180 | ELT is a character. The char-tables CANON, UP, and DOWN are in | |
181 | CASE_TABLE. */ | |
e16696ba | 182 | |
c0c15b93 | 183 | static void |
971de7fb | 184 | set_canon (Lisp_Object case_table, Lisp_Object range, Lisp_Object elt) |
c0c15b93 | 185 | { |
da2795b2 KH |
186 | Lisp_Object up = XCHAR_TABLE (case_table)->extras[0]; |
187 | Lisp_Object canon = XCHAR_TABLE (case_table)->extras[1]; | |
c0c15b93 | 188 | |
da2795b2 | 189 | if (NATNUMP (elt)) |
405b0b5a | 190 | Fset_char_table_range (canon, range, Faref (case_table, Faref (up, elt))); |
c0c15b93 | 191 | } |
dcfdbac7 | 192 | |
8f924df7 KH |
193 | /* Set elements of char-table TABLE for C to C itself. C may be a |
194 | cons specifying a character range. In that case, set characters in | |
195 | that range to themselves. This is done only when ELT is a | |
196 | character. This is called in map_char_table. */ | |
e16696ba | 197 | |
7f7fef04 | 198 | static void |
971de7fb | 199 | set_identity (Lisp_Object table, Lisp_Object c, Lisp_Object elt) |
dcfdbac7 | 200 | { |
da2795b2 | 201 | if (NATNUMP (elt)) |
e961d439 | 202 | { |
8f924df7 KH |
203 | int from, to; |
204 | ||
205 | if (CONSP (c)) | |
e961d439 | 206 | { |
8f924df7 KH |
207 | from = XINT (XCAR (c)); |
208 | to = XINT (XCDR (c)); | |
e961d439 KH |
209 | } |
210 | else | |
8f924df7 | 211 | from = to = XINT (c); |
e961d439 | 212 | for (; from <= to; from++) |
405b0b5a | 213 | CHAR_TABLE_SET (table, from, make_number (from)); |
e961d439 | 214 | } |
dcfdbac7 | 215 | } |
c0c15b93 | 216 | |
da2795b2 KH |
217 | /* Permute the elements of TABLE (which is initially an identity |
218 | mapping) so that it has one cycle for each equivalence class | |
219 | induced by the translation table on which map_char_table is | |
220 | operated. */ | |
c0c15b93 KH |
221 | |
222 | static void | |
971de7fb | 223 | shuffle (Lisp_Object table, Lisp_Object c, Lisp_Object elt) |
c0c15b93 | 224 | { |
e961d439 | 225 | if (NATNUMP (elt)) |
da2795b2 | 226 | { |
8f924df7 | 227 | int from, to; |
e961d439 | 228 | |
8f924df7 | 229 | if (CONSP (c)) |
e961d439 | 230 | { |
8f924df7 KH |
231 | from = XINT (XCAR (c)); |
232 | to = XINT (XCDR (c)); | |
e961d439 KH |
233 | } |
234 | else | |
8f924df7 | 235 | from = to = XINT (c); |
e961d439 KH |
236 | |
237 | for (; from <= to; from++) | |
fa055055 KH |
238 | { |
239 | Lisp_Object tem = Faref (table, elt); | |
240 | Faset (table, elt, make_number (from)); | |
241 | Faset (table, make_number (from), tem); | |
242 | } | |
da2795b2 | 243 | } |
c0c15b93 | 244 | } |
dcfdbac7 | 245 | \f |
dfcf069d | 246 | void |
971de7fb | 247 | init_casetab_once (void) |
dcfdbac7 JB |
248 | { |
249 | register int i; | |
7f7fef04 | 250 | Lisp_Object down, up; |
d67b4f80 | 251 | Qcase_table = intern_c_string ("case-table"); |
7f7fef04 RS |
252 | staticpro (&Qcase_table); |
253 | ||
254 | /* Intern this now in case it isn't already done. | |
255 | Setting this variable twice is harmless. | |
256 | But don't staticpro it here--that is done in alloc.c. */ | |
d67b4f80 | 257 | Qchar_table_extra_slots = intern_c_string ("char-table-extra-slots"); |
dcfdbac7 | 258 | |
7f7fef04 RS |
259 | /* Now we are ready to set up this property, so we can |
260 | create char tables. */ | |
4b3bd052 | 261 | Fput (Qcase_table, Qchar_table_extra_slots, make_number (3)); |
7f7fef04 RS |
262 | |
263 | down = Fmake_char_table (Qcase_table, Qnil); | |
264 | Vascii_downcase_table = down; | |
e1b490ca | 265 | XCHAR_TABLE (down)->purpose = Qcase_table; |
dcfdbac7 | 266 | |
e961d439 | 267 | for (i = 0; i < 128; i++) |
8f924df7 KH |
268 | { |
269 | int c = (i >= 'A' && i <= 'Z') ? i + ('a' - 'A') : i; | |
270 | CHAR_TABLE_SET (down, i, make_number (c)); | |
271 | } | |
7f7fef04 RS |
272 | |
273 | XCHAR_TABLE (down)->extras[1] = Fcopy_sequence (down); | |
dcfdbac7 | 274 | |
7f7fef04 RS |
275 | up = Fmake_char_table (Qcase_table, Qnil); |
276 | XCHAR_TABLE (down)->extras[0] = up; | |
dcfdbac7 | 277 | |
e961d439 | 278 | for (i = 0; i < 128; i++) |
8f924df7 KH |
279 | { |
280 | int c = ((i >= 'A' && i <= 'Z') ? i + ('a' - 'A') | |
281 | : ((i >= 'a' && i <= 'z') ? i + ('A' - 'a') | |
8510724d | 282 | : i)); |
8f924df7 KH |
283 | CHAR_TABLE_SET (up, i, make_number (c)); |
284 | } | |
7f7fef04 RS |
285 | |
286 | XCHAR_TABLE (down)->extras[2] = Fcopy_sequence (up); | |
66aa138d RS |
287 | |
288 | /* Fill in what isn't filled in. */ | |
289 | set_case_table (down, 1); | |
dcfdbac7 JB |
290 | } |
291 | ||
dfcf069d | 292 | void |
971de7fb | 293 | syms_of_casetab (void) |
dcfdbac7 | 294 | { |
d67b4f80 | 295 | Qcase_table_p = intern_c_string ("case-table-p"); |
dcfdbac7 | 296 | staticpro (&Qcase_table_p); |
7f7fef04 | 297 | |
8f84b1a1 | 298 | staticpro (&Vascii_canon_table); |
dcfdbac7 | 299 | staticpro (&Vascii_downcase_table); |
8f84b1a1 EN |
300 | staticpro (&Vascii_eqv_table); |
301 | staticpro (&Vascii_upcase_table); | |
dcfdbac7 JB |
302 | |
303 | defsubr (&Scase_table_p); | |
304 | defsubr (&Scurrent_case_table); | |
305 | defsubr (&Sstandard_case_table); | |
306 | defsubr (&Sset_case_table); | |
307 | defsubr (&Sset_standard_case_table); | |
dcfdbac7 | 308 | } |
6b61353c KH |
309 | |
310 | /* arch-tag: e06388ad-99fe-40ec-ba67-9d010fcc4916 | |
311 | (do not change this comment) */ |