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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 | 43 | See `set-case-table' for more information on these data structures. */) |
5842a27b | 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 | |
971de7fb | 65 | check_case_table (Lisp_Object obj) |
dcfdbac7 | 66 | { |
a5f07f6d | 67 | CHECK_TYPE (!NILP (Fcase_table_p (obj)), Qcase_table_p, obj); |
dcfdbac7 | 68 | return (obj); |
177c0ea7 | 69 | } |
dcfdbac7 JB |
70 | |
71 | DEFUN ("current-case-table", Fcurrent_case_table, Scurrent_case_table, 0, 0, 0, | |
fdb82f93 | 72 | doc: /* Return the case table of the current buffer. */) |
5842a27b | 73 | (void) |
dcfdbac7 | 74 | { |
7f7fef04 | 75 | return current_buffer->downcase_table; |
dcfdbac7 JB |
76 | } |
77 | ||
a1de6b4b | 78 | DEFUN ("standard-case-table", Fstandard_case_table, Sstandard_case_table, 0, 0, 0, |
fdb82f93 PJ |
79 | doc: /* Return the standard case table. |
80 | This is the one used for new buffers. */) | |
5842a27b | 81 | (void) |
dcfdbac7 | 82 | { |
7f7fef04 | 83 | return Vascii_downcase_table; |
dcfdbac7 JB |
84 | } |
85 | ||
971de7fb | 86 | static Lisp_Object set_case_table (Lisp_Object table, int standard); |
d9da9451 | 87 | |
dcfdbac7 | 88 | DEFUN ("set-case-table", Fset_case_table, Sset_case_table, 1, 1, 0, |
fdb82f93 PJ |
89 | doc: /* Select a new case table for the current buffer. |
90 | A case table is a char-table which maps characters | |
91 | to their lower-case equivalents. It also has three \"extra\" slots | |
92 | which may be additional char-tables or nil. | |
93 | These slots are called UPCASE, CANONICALIZE and EQUIVALENCES. | |
f6a18aa2 RS |
94 | UPCASE maps each non-upper-case character to its upper-case equivalent. |
95 | (The value in UPCASE for an upper-case character is never used.) | |
96 | If lower and upper case characters are in 1-1 correspondence, | |
fdb82f93 PJ |
97 | you may use nil and the upcase table will be deduced from DOWNCASE. |
98 | CANONICALIZE maps each character to a canonical equivalent; | |
99 | any two characters that are related by case-conversion have the same | |
100 | canonical equivalent character; it may be nil, in which case it is | |
101 | deduced from DOWNCASE and UPCASE. | |
102 | EQUIVALENCES is a map that cyclicly permutes each equivalence class | |
103 | (of characters with the same canonical equivalent); it may be nil, | |
104 | in which case it is deduced from CANONICALIZE. */) | |
5842a27b | 105 | (Lisp_Object table) |
dcfdbac7 | 106 | { |
d9da9451 | 107 | return set_case_table (table, 0); |
dcfdbac7 JB |
108 | } |
109 | ||
a1de6b4b | 110 | DEFUN ("set-standard-case-table", Fset_standard_case_table, Sset_standard_case_table, 1, 1, 0, |
fdb82f93 PJ |
111 | doc: /* Select a new standard case table for new buffers. |
112 | See `set-case-table' for more info on case tables. */) | |
5842a27b | 113 | (Lisp_Object table) |
dcfdbac7 | 114 | { |
d9da9451 | 115 | return set_case_table (table, 1); |
dcfdbac7 JB |
116 | } |
117 | ||
d9da9451 | 118 | static Lisp_Object |
971de7fb | 119 | set_case_table (Lisp_Object table, int standard) |
dcfdbac7 | 120 | { |
4b3bd052 | 121 | Lisp_Object up, canon, eqv; |
dcfdbac7 JB |
122 | |
123 | check_case_table (table); | |
124 | ||
7f7fef04 RS |
125 | up = XCHAR_TABLE (table)->extras[0]; |
126 | canon = XCHAR_TABLE (table)->extras[1]; | |
127 | eqv = XCHAR_TABLE (table)->extras[2]; | |
dcfdbac7 | 128 | |
d427b66a | 129 | if (NILP (up)) |
dcfdbac7 | 130 | { |
7f7fef04 | 131 | up = Fmake_char_table (Qcase_table, Qnil); |
8f924df7 KH |
132 | map_char_table (set_identity, Qnil, table, up); |
133 | map_char_table (shuffle, Qnil, table, up); | |
7f7fef04 | 134 | XCHAR_TABLE (table)->extras[0] = up; |
dcfdbac7 JB |
135 | } |
136 | ||
d427b66a | 137 | if (NILP (canon)) |
dcfdbac7 | 138 | { |
4b3bd052 | 139 | canon = Fmake_char_table (Qcase_table, Qnil); |
7f7fef04 | 140 | XCHAR_TABLE (table)->extras[1] = canon; |
8f924df7 | 141 | map_char_table (set_canon, Qnil, table, table); |
5a0fd72f RS |
142 | } |
143 | ||
144 | if (NILP (eqv)) | |
145 | { | |
7f7fef04 | 146 | eqv = Fmake_char_table (Qcase_table, Qnil); |
8f924df7 KH |
147 | map_char_table (set_identity, Qnil, canon, eqv); |
148 | map_char_table (shuffle, Qnil, canon, eqv); | |
4b3bd052 | 149 | XCHAR_TABLE (table)->extras[2] = eqv; |
dcfdbac7 JB |
150 | } |
151 | ||
426f6c23 RS |
152 | /* This is so set_image_of_range_1 in regex.c can find the EQV table. */ |
153 | XCHAR_TABLE (canon)->extras[2] = eqv; | |
154 | ||
dcfdbac7 | 155 | if (standard) |
f79609dc KH |
156 | { |
157 | Vascii_downcase_table = table; | |
158 | Vascii_upcase_table = up; | |
159 | Vascii_canon_table = canon; | |
160 | Vascii_eqv_table = eqv; | |
161 | } | |
dcfdbac7 | 162 | else |
6c6fcbf8 RS |
163 | { |
164 | current_buffer->downcase_table = table; | |
165 | current_buffer->upcase_table = up; | |
166 | current_buffer->case_canon_table = canon; | |
167 | current_buffer->case_eqv_table = eqv; | |
168 | } | |
7f7fef04 | 169 | |
dcfdbac7 JB |
170 | return table; |
171 | } | |
172 | \f | |
da2795b2 KH |
173 | /* The following functions are called in map_char_table. */ |
174 | ||
8f924df7 KH |
175 | /* Set CANON char-table element for characters in RANGE to a |
176 | translated ELT by UP and DOWN char-tables. This is done only when | |
177 | ELT is a character. The char-tables CANON, UP, and DOWN are in | |
178 | CASE_TABLE. */ | |
e16696ba | 179 | |
c0c15b93 | 180 | static void |
971de7fb | 181 | set_canon (Lisp_Object case_table, Lisp_Object range, Lisp_Object elt) |
c0c15b93 | 182 | { |
da2795b2 KH |
183 | Lisp_Object up = XCHAR_TABLE (case_table)->extras[0]; |
184 | Lisp_Object canon = XCHAR_TABLE (case_table)->extras[1]; | |
c0c15b93 | 185 | |
da2795b2 | 186 | if (NATNUMP (elt)) |
405b0b5a | 187 | Fset_char_table_range (canon, range, Faref (case_table, Faref (up, elt))); |
c0c15b93 | 188 | } |
dcfdbac7 | 189 | |
8f924df7 KH |
190 | /* Set elements of char-table TABLE for C to C itself. C may be a |
191 | cons specifying a character range. In that case, set characters in | |
192 | that range to themselves. This is done only when ELT is a | |
193 | character. This is called in map_char_table. */ | |
e16696ba | 194 | |
7f7fef04 | 195 | static void |
971de7fb | 196 | set_identity (Lisp_Object table, Lisp_Object c, Lisp_Object elt) |
dcfdbac7 | 197 | { |
da2795b2 | 198 | if (NATNUMP (elt)) |
e961d439 | 199 | { |
8f924df7 KH |
200 | int from, to; |
201 | ||
202 | if (CONSP (c)) | |
e961d439 | 203 | { |
8f924df7 KH |
204 | from = XINT (XCAR (c)); |
205 | to = XINT (XCDR (c)); | |
e961d439 KH |
206 | } |
207 | else | |
8f924df7 | 208 | from = to = XINT (c); |
e961d439 | 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 | { |
8f924df7 | 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 KH |
233 | |
234 | for (; from <= to; from++) | |
fa055055 KH |
235 | { |
236 | Lisp_Object tem = Faref (table, elt); | |
237 | Faset (table, elt, make_number (from)); | |
238 | Faset (table, make_number (from), tem); | |
239 | } | |
da2795b2 | 240 | } |
c0c15b93 | 241 | } |
dcfdbac7 | 242 | \f |
dfcf069d | 243 | void |
971de7fb | 244 | init_casetab_once (void) |
dcfdbac7 JB |
245 | { |
246 | register int i; | |
7f7fef04 | 247 | Lisp_Object down, up; |
d67b4f80 | 248 | Qcase_table = intern_c_string ("case-table"); |
7f7fef04 RS |
249 | staticpro (&Qcase_table); |
250 | ||
251 | /* Intern this now in case it isn't already done. | |
252 | Setting this variable twice is harmless. | |
253 | But don't staticpro it here--that is done in alloc.c. */ | |
d67b4f80 | 254 | Qchar_table_extra_slots = intern_c_string ("char-table-extra-slots"); |
dcfdbac7 | 255 | |
7f7fef04 RS |
256 | /* Now we are ready to set up this property, so we can |
257 | create char tables. */ | |
4b3bd052 | 258 | Fput (Qcase_table, Qchar_table_extra_slots, make_number (3)); |
7f7fef04 RS |
259 | |
260 | down = Fmake_char_table (Qcase_table, Qnil); | |
261 | Vascii_downcase_table = down; | |
e1b490ca | 262 | XCHAR_TABLE (down)->purpose = Qcase_table; |
dcfdbac7 | 263 | |
e961d439 | 264 | for (i = 0; i < 128; i++) |
8f924df7 KH |
265 | { |
266 | int c = (i >= 'A' && i <= 'Z') ? i + ('a' - 'A') : i; | |
267 | CHAR_TABLE_SET (down, i, make_number (c)); | |
268 | } | |
7f7fef04 RS |
269 | |
270 | XCHAR_TABLE (down)->extras[1] = Fcopy_sequence (down); | |
dcfdbac7 | 271 | |
7f7fef04 RS |
272 | up = Fmake_char_table (Qcase_table, Qnil); |
273 | XCHAR_TABLE (down)->extras[0] = up; | |
dcfdbac7 | 274 | |
e961d439 | 275 | for (i = 0; i < 128; i++) |
8f924df7 KH |
276 | { |
277 | int c = ((i >= 'A' && i <= 'Z') ? i + ('a' - 'A') | |
278 | : ((i >= 'a' && i <= 'z') ? i + ('A' - 'a') | |
8510724d | 279 | : i)); |
8f924df7 KH |
280 | CHAR_TABLE_SET (up, i, make_number (c)); |
281 | } | |
7f7fef04 RS |
282 | |
283 | XCHAR_TABLE (down)->extras[2] = Fcopy_sequence (up); | |
66aa138d RS |
284 | |
285 | /* Fill in what isn't filled in. */ | |
286 | set_case_table (down, 1); | |
dcfdbac7 JB |
287 | } |
288 | ||
dfcf069d | 289 | void |
971de7fb | 290 | syms_of_casetab (void) |
dcfdbac7 | 291 | { |
d67b4f80 | 292 | Qcase_table_p = intern_c_string ("case-table-p"); |
dcfdbac7 | 293 | staticpro (&Qcase_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 | } |
6b61353c KH |
306 | |
307 | /* arch-tag: e06388ad-99fe-40ec-ba67-9d010fcc4916 | |
308 | (do not change this comment) */ |