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dcfdbac7 | 1 | /* GNU Emacs routines to deal with case tables. |
a5f07f6d | 2 | Copyright (C) 1993, 1994, 2002, 2003, 2004, |
aaef169d | 3 | 2005, 2006 Free Software Foundation, Inc. |
dcfdbac7 JB |
4 | |
5 | This file is part of GNU Emacs. | |
6 | ||
7 | GNU Emacs is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
7c938215 | 9 | the Free Software Foundation; either version 2, or (at your option) |
dcfdbac7 JB |
10 | any later version. |
11 | ||
12 | GNU Emacs is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GNU Emacs; see the file COPYING. If not, write to | |
4fc5845f LK |
19 | the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
20 | Boston, MA 02110-1301, USA. */ | |
dcfdbac7 | 21 | |
48bbe3a8 | 22 | /* Written by Howard Gayle. */ |
dcfdbac7 | 23 | |
18160b98 | 24 | #include <config.h> |
dcfdbac7 JB |
25 | #include "lisp.h" |
26 | #include "buffer.h" | |
c0c15b93 | 27 | #include "charset.h" |
dcfdbac7 | 28 | |
7f7fef04 | 29 | Lisp_Object Qcase_table_p, Qcase_table; |
dcfdbac7 JB |
30 | Lisp_Object Vascii_downcase_table, Vascii_upcase_table; |
31 | Lisp_Object Vascii_canon_table, Vascii_eqv_table; | |
32 | ||
da2795b2 KH |
33 | /* Used as a temporary in DOWNCASE and other macros in lisp.h. No |
34 | need to mark it, since it is used only very temporarily. */ | |
2e34157c RS |
35 | int case_temp1; |
36 | Lisp_Object case_temp2; | |
da2795b2 KH |
37 | |
38 | static void set_canon (); | |
39 | static void set_identity (); | |
40 | static void shuffle (); | |
dcfdbac7 JB |
41 | |
42 | DEFUN ("case-table-p", Fcase_table_p, Scase_table_p, 1, 1, 0, | |
fdb82f93 PJ |
43 | doc: /* Return t iff OBJECT is a case table. |
44 | See `set-case-table' for more information on these data structures. */) | |
45 | (object) | |
2858a1c1 | 46 | Lisp_Object object; |
dcfdbac7 | 47 | { |
4b3bd052 | 48 | Lisp_Object up, canon, eqv; |
dcfdbac7 | 49 | |
2858a1c1 | 50 | if (! CHAR_TABLE_P (object)) |
7f7fef04 | 51 | return Qnil; |
2858a1c1 | 52 | if (! EQ (XCHAR_TABLE (object)->purpose, Qcase_table)) |
7f7fef04 | 53 | return Qnil; |
dcfdbac7 | 54 | |
2858a1c1 EN |
55 | up = XCHAR_TABLE (object)->extras[0]; |
56 | canon = XCHAR_TABLE (object)->extras[1]; | |
57 | eqv = XCHAR_TABLE (object)->extras[2]; | |
7f7fef04 RS |
58 | |
59 | return ((NILP (up) || CHAR_TABLE_P (up)) | |
d427b66a | 60 | && ((NILP (canon) && NILP (eqv)) |
7f7fef04 RS |
61 | || (CHAR_TABLE_P (canon) |
62 | && (NILP (eqv) || CHAR_TABLE_P (eqv)))) | |
dcfdbac7 JB |
63 | ? Qt : Qnil); |
64 | } | |
65 | ||
66 | static Lisp_Object | |
67 | check_case_table (obj) | |
68 | Lisp_Object obj; | |
69 | { | |
a5f07f6d | 70 | CHECK_TYPE (!NILP (Fcase_table_p (obj)), Qcase_table_p, obj); |
dcfdbac7 | 71 | return (obj); |
177c0ea7 | 72 | } |
dcfdbac7 JB |
73 | |
74 | DEFUN ("current-case-table", Fcurrent_case_table, Scurrent_case_table, 0, 0, 0, | |
fdb82f93 PJ |
75 | doc: /* Return the case table of the current buffer. */) |
76 | () | |
dcfdbac7 | 77 | { |
7f7fef04 | 78 | return current_buffer->downcase_table; |
dcfdbac7 JB |
79 | } |
80 | ||
a1de6b4b | 81 | DEFUN ("standard-case-table", Fstandard_case_table, Sstandard_case_table, 0, 0, 0, |
fdb82f93 PJ |
82 | doc: /* Return the standard case table. |
83 | This is the one used for new buffers. */) | |
84 | () | |
dcfdbac7 | 85 | { |
7f7fef04 | 86 | return Vascii_downcase_table; |
dcfdbac7 JB |
87 | } |
88 | ||
d9da9451 JB |
89 | static Lisp_Object set_case_table (); |
90 | ||
dcfdbac7 | 91 | DEFUN ("set-case-table", Fset_case_table, Sset_case_table, 1, 1, 0, |
fdb82f93 PJ |
92 | doc: /* Select a new case table for the current buffer. |
93 | A case table is a char-table which maps characters | |
94 | to their lower-case equivalents. It also has three \"extra\" slots | |
95 | which may be additional char-tables or nil. | |
96 | These slots are called UPCASE, CANONICALIZE and EQUIVALENCES. | |
f6a18aa2 RS |
97 | UPCASE maps each non-upper-case character to its upper-case equivalent. |
98 | (The value in UPCASE for an upper-case character is never used.) | |
99 | If lower and upper case characters are in 1-1 correspondence, | |
fdb82f93 PJ |
100 | you may use nil and the upcase table will be deduced from DOWNCASE. |
101 | CANONICALIZE maps each character to a canonical equivalent; | |
102 | any two characters that are related by case-conversion have the same | |
103 | canonical equivalent character; it may be nil, in which case it is | |
104 | deduced from DOWNCASE and UPCASE. | |
105 | EQUIVALENCES is a map that cyclicly permutes each equivalence class | |
106 | (of characters with the same canonical equivalent); it may be nil, | |
107 | in which case it is deduced from CANONICALIZE. */) | |
108 | (table) | |
dcfdbac7 JB |
109 | Lisp_Object table; |
110 | { | |
d9da9451 | 111 | return set_case_table (table, 0); |
dcfdbac7 JB |
112 | } |
113 | ||
a1de6b4b | 114 | DEFUN ("set-standard-case-table", Fset_standard_case_table, Sset_standard_case_table, 1, 1, 0, |
fdb82f93 PJ |
115 | doc: /* Select a new standard case table for new buffers. |
116 | See `set-case-table' for more info on case tables. */) | |
117 | (table) | |
dcfdbac7 JB |
118 | Lisp_Object table; |
119 | { | |
d9da9451 | 120 | return set_case_table (table, 1); |
dcfdbac7 JB |
121 | } |
122 | ||
d9da9451 | 123 | static Lisp_Object |
dcfdbac7 JB |
124 | set_case_table (table, standard) |
125 | Lisp_Object table; | |
126 | int standard; | |
127 | { | |
4b3bd052 | 128 | Lisp_Object up, canon, eqv; |
da2795b2 | 129 | Lisp_Object indices[3]; |
dcfdbac7 JB |
130 | |
131 | check_case_table (table); | |
132 | ||
7f7fef04 RS |
133 | up = XCHAR_TABLE (table)->extras[0]; |
134 | canon = XCHAR_TABLE (table)->extras[1]; | |
135 | eqv = XCHAR_TABLE (table)->extras[2]; | |
dcfdbac7 | 136 | |
d427b66a | 137 | if (NILP (up)) |
dcfdbac7 | 138 | { |
7f7fef04 | 139 | up = Fmake_char_table (Qcase_table, Qnil); |
e0c04065 RS |
140 | map_char_table (set_identity, Qnil, table, table, up, 0, indices); |
141 | map_char_table (shuffle, Qnil, table, table, up, 0, indices); | |
7f7fef04 | 142 | XCHAR_TABLE (table)->extras[0] = up; |
dcfdbac7 JB |
143 | } |
144 | ||
d427b66a | 145 | if (NILP (canon)) |
dcfdbac7 | 146 | { |
4b3bd052 | 147 | canon = Fmake_char_table (Qcase_table, Qnil); |
7f7fef04 | 148 | XCHAR_TABLE (table)->extras[1] = canon; |
e0c04065 | 149 | map_char_table (set_canon, Qnil, table, table, table, 0, indices); |
5a0fd72f RS |
150 | } |
151 | ||
152 | if (NILP (eqv)) | |
153 | { | |
7f7fef04 | 154 | eqv = Fmake_char_table (Qcase_table, Qnil); |
e0c04065 RS |
155 | map_char_table (set_identity, Qnil, canon, canon, eqv, 0, indices); |
156 | map_char_table (shuffle, Qnil, canon, canon, eqv, 0, indices); | |
4b3bd052 | 157 | XCHAR_TABLE (table)->extras[2] = eqv; |
dcfdbac7 JB |
158 | } |
159 | ||
426f6c23 RS |
160 | /* This is so set_image_of_range_1 in regex.c can find the EQV table. */ |
161 | XCHAR_TABLE (canon)->extras[2] = eqv; | |
162 | ||
dcfdbac7 | 163 | if (standard) |
f79609dc KH |
164 | { |
165 | Vascii_downcase_table = table; | |
166 | Vascii_upcase_table = up; | |
167 | Vascii_canon_table = canon; | |
168 | Vascii_eqv_table = eqv; | |
169 | } | |
dcfdbac7 | 170 | else |
6c6fcbf8 RS |
171 | { |
172 | current_buffer->downcase_table = table; | |
173 | current_buffer->upcase_table = up; | |
174 | current_buffer->case_canon_table = canon; | |
175 | current_buffer->case_eqv_table = eqv; | |
176 | } | |
7f7fef04 | 177 | |
dcfdbac7 JB |
178 | return table; |
179 | } | |
180 | \f | |
da2795b2 KH |
181 | /* The following functions are called in map_char_table. */ |
182 | ||
183 | /* Set CANON char-table element for C to a translated ELT by UP and | |
184 | DOWN char-tables. This is done only when ELT is a character. The | |
185 | char-tables CANON, UP, and DOWN are in CASE_TABLE. */ | |
e16696ba | 186 | |
c0c15b93 | 187 | static void |
da2795b2 KH |
188 | set_canon (case_table, c, elt) |
189 | Lisp_Object case_table, c, elt; | |
c0c15b93 | 190 | { |
da2795b2 KH |
191 | Lisp_Object up = XCHAR_TABLE (case_table)->extras[0]; |
192 | Lisp_Object canon = XCHAR_TABLE (case_table)->extras[1]; | |
c0c15b93 | 193 | |
da2795b2 KH |
194 | if (NATNUMP (elt)) |
195 | Faset (canon, c, Faref (case_table, Faref (up, elt))); | |
c0c15b93 | 196 | } |
dcfdbac7 | 197 | |
da2795b2 KH |
198 | /* Set elements of char-table TABLE for C to C itself. This is done |
199 | only when ELT is a character. This is called in map_char_table. */ | |
e16696ba | 200 | |
7f7fef04 | 201 | static void |
da2795b2 KH |
202 | set_identity (table, c, elt) |
203 | Lisp_Object table, c, elt; | |
dcfdbac7 | 204 | { |
da2795b2 KH |
205 | if (NATNUMP (elt)) |
206 | Faset (table, c, c); | |
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 | |
da2795b2 KH |
215 | shuffle (table, c, elt) |
216 | Lisp_Object table, c, elt; | |
c0c15b93 | 217 | { |
2e34157c | 218 | if (NATNUMP (elt) && !EQ (c, elt)) |
da2795b2 KH |
219 | { |
220 | Lisp_Object tem = Faref (table, elt); | |
221 | Faset (table, elt, c); | |
222 | Faset (table, c, tem); | |
223 | } | |
c0c15b93 | 224 | } |
dcfdbac7 | 225 | \f |
dfcf069d | 226 | void |
dcfdbac7 JB |
227 | init_casetab_once () |
228 | { | |
229 | register int i; | |
7f7fef04 RS |
230 | Lisp_Object down, up; |
231 | Qcase_table = intern ("case-table"); | |
232 | staticpro (&Qcase_table); | |
233 | ||
234 | /* Intern this now in case it isn't already done. | |
235 | Setting this variable twice is harmless. | |
236 | But don't staticpro it here--that is done in alloc.c. */ | |
237 | Qchar_table_extra_slots = intern ("char-table-extra-slots"); | |
dcfdbac7 | 238 | |
7f7fef04 RS |
239 | /* Now we are ready to set up this property, so we can |
240 | create char tables. */ | |
4b3bd052 | 241 | Fput (Qcase_table, Qchar_table_extra_slots, make_number (3)); |
7f7fef04 RS |
242 | |
243 | down = Fmake_char_table (Qcase_table, Qnil); | |
244 | Vascii_downcase_table = down; | |
e1b490ca | 245 | XCHAR_TABLE (down)->purpose = Qcase_table; |
dcfdbac7 | 246 | |
c0c15b93 KH |
247 | for (i = 0; i < CHAR_TABLE_SINGLE_BYTE_SLOTS; i++) |
248 | XSETFASTINT (XCHAR_TABLE (down)->contents[i], | |
249 | (i >= 'A' && i <= 'Z') ? i + ('a' - 'A') : i); | |
7f7fef04 RS |
250 | |
251 | XCHAR_TABLE (down)->extras[1] = Fcopy_sequence (down); | |
dcfdbac7 | 252 | |
7f7fef04 RS |
253 | up = Fmake_char_table (Qcase_table, Qnil); |
254 | XCHAR_TABLE (down)->extras[0] = up; | |
dcfdbac7 | 255 | |
c0c15b93 KH |
256 | for (i = 0; i < CHAR_TABLE_SINGLE_BYTE_SLOTS; i++) |
257 | XSETFASTINT (XCHAR_TABLE (up)->contents[i], | |
258 | ((i >= 'A' && i <= 'Z') | |
259 | ? i + ('a' - 'A') | |
260 | : ((i >= 'a' && i <= 'z') | |
261 | ? i + ('A' - 'a') | |
262 | : i))); | |
7f7fef04 RS |
263 | |
264 | XCHAR_TABLE (down)->extras[2] = Fcopy_sequence (up); | |
dcfdbac7 JB |
265 | } |
266 | ||
dfcf069d | 267 | void |
dcfdbac7 JB |
268 | syms_of_casetab () |
269 | { | |
270 | Qcase_table_p = intern ("case-table-p"); | |
271 | staticpro (&Qcase_table_p); | |
7f7fef04 | 272 | |
8f84b1a1 | 273 | staticpro (&Vascii_canon_table); |
dcfdbac7 | 274 | staticpro (&Vascii_downcase_table); |
8f84b1a1 EN |
275 | staticpro (&Vascii_eqv_table); |
276 | staticpro (&Vascii_upcase_table); | |
dcfdbac7 JB |
277 | |
278 | defsubr (&Scase_table_p); | |
279 | defsubr (&Scurrent_case_table); | |
280 | defsubr (&Sstandard_case_table); | |
281 | defsubr (&Sset_case_table); | |
282 | defsubr (&Sset_standard_case_table); | |
dcfdbac7 | 283 | } |
ab5796a9 MB |
284 | |
285 | /* arch-tag: e06388ad-99fe-40ec-ba67-9d010fcc4916 | |
286 | (do not change this comment) */ |