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dcfdbac7 | 1 | /* GNU Emacs routines to deal with case tables. |
0b5538bd TTN |
2 | Copyright (C) 1993, 1994, 2002, 2003, 2004, |
3 | 2005 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 | { | |
70 | register Lisp_Object tem; | |
71 | ||
d427b66a | 72 | while (tem = Fcase_table_p (obj), NILP (tem)) |
b37902c8 | 73 | obj = wrong_type_argument (Qcase_table_p, obj); |
dcfdbac7 | 74 | return (obj); |
177c0ea7 | 75 | } |
dcfdbac7 JB |
76 | |
77 | DEFUN ("current-case-table", Fcurrent_case_table, Scurrent_case_table, 0, 0, 0, | |
fdb82f93 PJ |
78 | doc: /* Return the case table of the current buffer. */) |
79 | () | |
dcfdbac7 | 80 | { |
7f7fef04 | 81 | return current_buffer->downcase_table; |
dcfdbac7 JB |
82 | } |
83 | ||
a1de6b4b | 84 | DEFUN ("standard-case-table", Fstandard_case_table, Sstandard_case_table, 0, 0, 0, |
fdb82f93 PJ |
85 | doc: /* Return the standard case table. |
86 | This is the one used for new buffers. */) | |
87 | () | |
dcfdbac7 | 88 | { |
7f7fef04 | 89 | return Vascii_downcase_table; |
dcfdbac7 JB |
90 | } |
91 | ||
d9da9451 JB |
92 | static Lisp_Object set_case_table (); |
93 | ||
dcfdbac7 | 94 | DEFUN ("set-case-table", Fset_case_table, Sset_case_table, 1, 1, 0, |
fdb82f93 PJ |
95 | doc: /* Select a new case table for the current buffer. |
96 | A case table is a char-table which maps characters | |
97 | to their lower-case equivalents. It also has three \"extra\" slots | |
98 | which may be additional char-tables or nil. | |
99 | These slots are called UPCASE, CANONICALIZE and EQUIVALENCES. | |
f6a18aa2 RS |
100 | UPCASE maps each non-upper-case character to its upper-case equivalent. |
101 | (The value in UPCASE for an upper-case character is never used.) | |
102 | If lower and upper case characters are in 1-1 correspondence, | |
fdb82f93 PJ |
103 | you may use nil and the upcase table will be deduced from DOWNCASE. |
104 | CANONICALIZE maps each character to a canonical equivalent; | |
105 | any two characters that are related by case-conversion have the same | |
106 | canonical equivalent character; it may be nil, in which case it is | |
107 | deduced from DOWNCASE and UPCASE. | |
108 | EQUIVALENCES is a map that cyclicly permutes each equivalence class | |
109 | (of characters with the same canonical equivalent); it may be nil, | |
110 | in which case it is deduced from CANONICALIZE. */) | |
111 | (table) | |
dcfdbac7 JB |
112 | Lisp_Object table; |
113 | { | |
d9da9451 | 114 | return set_case_table (table, 0); |
dcfdbac7 JB |
115 | } |
116 | ||
a1de6b4b | 117 | DEFUN ("set-standard-case-table", Fset_standard_case_table, Sset_standard_case_table, 1, 1, 0, |
fdb82f93 PJ |
118 | doc: /* Select a new standard case table for new buffers. |
119 | See `set-case-table' for more info on case tables. */) | |
120 | (table) | |
dcfdbac7 JB |
121 | Lisp_Object table; |
122 | { | |
d9da9451 | 123 | return set_case_table (table, 1); |
dcfdbac7 JB |
124 | } |
125 | ||
d9da9451 | 126 | static Lisp_Object |
dcfdbac7 JB |
127 | set_case_table (table, standard) |
128 | Lisp_Object table; | |
129 | int standard; | |
130 | { | |
4b3bd052 | 131 | Lisp_Object up, canon, eqv; |
da2795b2 | 132 | Lisp_Object indices[3]; |
dcfdbac7 JB |
133 | |
134 | check_case_table (table); | |
135 | ||
7f7fef04 RS |
136 | up = XCHAR_TABLE (table)->extras[0]; |
137 | canon = XCHAR_TABLE (table)->extras[1]; | |
138 | eqv = XCHAR_TABLE (table)->extras[2]; | |
dcfdbac7 | 139 | |
d427b66a | 140 | if (NILP (up)) |
dcfdbac7 | 141 | { |
7f7fef04 | 142 | up = Fmake_char_table (Qcase_table, Qnil); |
e0c04065 RS |
143 | map_char_table (set_identity, Qnil, table, table, up, 0, indices); |
144 | map_char_table (shuffle, Qnil, table, table, up, 0, indices); | |
7f7fef04 | 145 | XCHAR_TABLE (table)->extras[0] = up; |
dcfdbac7 JB |
146 | } |
147 | ||
d427b66a | 148 | if (NILP (canon)) |
dcfdbac7 | 149 | { |
4b3bd052 | 150 | canon = Fmake_char_table (Qcase_table, Qnil); |
7f7fef04 | 151 | XCHAR_TABLE (table)->extras[1] = canon; |
e0c04065 | 152 | map_char_table (set_canon, Qnil, table, table, table, 0, indices); |
5a0fd72f RS |
153 | } |
154 | ||
155 | if (NILP (eqv)) | |
156 | { | |
7f7fef04 | 157 | eqv = Fmake_char_table (Qcase_table, Qnil); |
e0c04065 RS |
158 | map_char_table (set_identity, Qnil, canon, canon, eqv, 0, indices); |
159 | map_char_table (shuffle, Qnil, canon, canon, eqv, 0, indices); | |
4b3bd052 | 160 | XCHAR_TABLE (table)->extras[2] = eqv; |
dcfdbac7 JB |
161 | } |
162 | ||
426f6c23 RS |
163 | /* This is so set_image_of_range_1 in regex.c can find the EQV table. */ |
164 | XCHAR_TABLE (canon)->extras[2] = eqv; | |
165 | ||
dcfdbac7 | 166 | if (standard) |
f79609dc KH |
167 | { |
168 | Vascii_downcase_table = table; | |
169 | Vascii_upcase_table = up; | |
170 | Vascii_canon_table = canon; | |
171 | Vascii_eqv_table = eqv; | |
172 | } | |
dcfdbac7 | 173 | else |
6c6fcbf8 RS |
174 | { |
175 | current_buffer->downcase_table = table; | |
176 | current_buffer->upcase_table = up; | |
177 | current_buffer->case_canon_table = canon; | |
178 | current_buffer->case_eqv_table = eqv; | |
179 | } | |
7f7fef04 | 180 | |
dcfdbac7 JB |
181 | return table; |
182 | } | |
183 | \f | |
da2795b2 KH |
184 | /* The following functions are called in map_char_table. */ |
185 | ||
186 | /* Set CANON char-table element for C to a translated ELT by UP and | |
187 | DOWN char-tables. This is done only when ELT is a character. The | |
188 | char-tables CANON, UP, and DOWN are in CASE_TABLE. */ | |
e16696ba | 189 | |
c0c15b93 | 190 | static void |
da2795b2 KH |
191 | set_canon (case_table, c, elt) |
192 | Lisp_Object case_table, c, elt; | |
c0c15b93 | 193 | { |
da2795b2 KH |
194 | Lisp_Object up = XCHAR_TABLE (case_table)->extras[0]; |
195 | Lisp_Object canon = XCHAR_TABLE (case_table)->extras[1]; | |
c0c15b93 | 196 | |
da2795b2 KH |
197 | if (NATNUMP (elt)) |
198 | Faset (canon, c, Faref (case_table, Faref (up, elt))); | |
c0c15b93 | 199 | } |
dcfdbac7 | 200 | |
da2795b2 KH |
201 | /* Set elements of char-table TABLE for C to C itself. This is done |
202 | only when ELT is a character. This is called in map_char_table. */ | |
e16696ba | 203 | |
7f7fef04 | 204 | static void |
da2795b2 KH |
205 | set_identity (table, c, elt) |
206 | Lisp_Object table, c, elt; | |
dcfdbac7 | 207 | { |
da2795b2 KH |
208 | if (NATNUMP (elt)) |
209 | Faset (table, c, c); | |
dcfdbac7 | 210 | } |
c0c15b93 | 211 | |
da2795b2 KH |
212 | /* Permute the elements of TABLE (which is initially an identity |
213 | mapping) so that it has one cycle for each equivalence class | |
214 | induced by the translation table on which map_char_table is | |
215 | operated. */ | |
c0c15b93 KH |
216 | |
217 | static void | |
da2795b2 KH |
218 | shuffle (table, c, elt) |
219 | Lisp_Object table, c, elt; | |
c0c15b93 | 220 | { |
2e34157c | 221 | if (NATNUMP (elt) && !EQ (c, elt)) |
da2795b2 KH |
222 | { |
223 | Lisp_Object tem = Faref (table, elt); | |
224 | Faset (table, elt, c); | |
225 | Faset (table, c, tem); | |
226 | } | |
c0c15b93 | 227 | } |
dcfdbac7 | 228 | \f |
dfcf069d | 229 | void |
dcfdbac7 JB |
230 | init_casetab_once () |
231 | { | |
232 | register int i; | |
7f7fef04 RS |
233 | Lisp_Object down, up; |
234 | Qcase_table = intern ("case-table"); | |
235 | staticpro (&Qcase_table); | |
236 | ||
237 | /* Intern this now in case it isn't already done. | |
238 | Setting this variable twice is harmless. | |
239 | But don't staticpro it here--that is done in alloc.c. */ | |
240 | Qchar_table_extra_slots = intern ("char-table-extra-slots"); | |
dcfdbac7 | 241 | |
7f7fef04 RS |
242 | /* Now we are ready to set up this property, so we can |
243 | create char tables. */ | |
4b3bd052 | 244 | Fput (Qcase_table, Qchar_table_extra_slots, make_number (3)); |
7f7fef04 RS |
245 | |
246 | down = Fmake_char_table (Qcase_table, Qnil); | |
247 | Vascii_downcase_table = down; | |
e1b490ca | 248 | XCHAR_TABLE (down)->purpose = Qcase_table; |
dcfdbac7 | 249 | |
c0c15b93 KH |
250 | for (i = 0; i < CHAR_TABLE_SINGLE_BYTE_SLOTS; i++) |
251 | XSETFASTINT (XCHAR_TABLE (down)->contents[i], | |
252 | (i >= 'A' && i <= 'Z') ? i + ('a' - 'A') : i); | |
7f7fef04 RS |
253 | |
254 | XCHAR_TABLE (down)->extras[1] = Fcopy_sequence (down); | |
dcfdbac7 | 255 | |
7f7fef04 RS |
256 | up = Fmake_char_table (Qcase_table, Qnil); |
257 | XCHAR_TABLE (down)->extras[0] = up; | |
dcfdbac7 | 258 | |
c0c15b93 KH |
259 | for (i = 0; i < CHAR_TABLE_SINGLE_BYTE_SLOTS; i++) |
260 | XSETFASTINT (XCHAR_TABLE (up)->contents[i], | |
261 | ((i >= 'A' && i <= 'Z') | |
262 | ? i + ('a' - 'A') | |
263 | : ((i >= 'a' && i <= 'z') | |
264 | ? i + ('A' - 'a') | |
265 | : i))); | |
7f7fef04 RS |
266 | |
267 | XCHAR_TABLE (down)->extras[2] = Fcopy_sequence (up); | |
dcfdbac7 JB |
268 | } |
269 | ||
dfcf069d | 270 | void |
dcfdbac7 JB |
271 | syms_of_casetab () |
272 | { | |
273 | Qcase_table_p = intern ("case-table-p"); | |
274 | staticpro (&Qcase_table_p); | |
7f7fef04 | 275 | |
8f84b1a1 | 276 | staticpro (&Vascii_canon_table); |
dcfdbac7 | 277 | staticpro (&Vascii_downcase_table); |
8f84b1a1 EN |
278 | staticpro (&Vascii_eqv_table); |
279 | staticpro (&Vascii_upcase_table); | |
dcfdbac7 JB |
280 | |
281 | defsubr (&Scase_table_p); | |
282 | defsubr (&Scurrent_case_table); | |
283 | defsubr (&Sstandard_case_table); | |
284 | defsubr (&Sset_case_table); | |
285 | defsubr (&Sset_standard_case_table); | |
dcfdbac7 | 286 | } |
ab5796a9 MB |
287 | |
288 | /* arch-tag: e06388ad-99fe-40ec-ba67-9d010fcc4916 | |
289 | (do not change this comment) */ |