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dcfdbac7 | 1 | /* GNU Emacs routines to deal with case tables. |
3a22ee35 | 2 | Copyright (C) 1993, 1994 Free Software Foundation, Inc. |
dcfdbac7 JB |
3 | |
4 | This file is part of GNU Emacs. | |
5 | ||
6 | GNU Emacs is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
7c938215 | 8 | the Free Software Foundation; either version 2, or (at your option) |
dcfdbac7 JB |
9 | any later version. |
10 | ||
11 | GNU Emacs is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU Emacs; see the file COPYING. If not, write to | |
3b7ad313 EN |
18 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
19 | Boston, MA 02111-1307, USA. */ | |
dcfdbac7 JB |
20 | |
21 | /* Written by Howard Gayle. See chartab.c for details. */ | |
22 | ||
18160b98 | 23 | #include <config.h> |
dcfdbac7 JB |
24 | #include "lisp.h" |
25 | #include "buffer.h" | |
26 | ||
7f7fef04 | 27 | Lisp_Object Qcase_table_p, Qcase_table; |
dcfdbac7 JB |
28 | Lisp_Object Vascii_downcase_table, Vascii_upcase_table; |
29 | Lisp_Object Vascii_canon_table, Vascii_eqv_table; | |
30 | ||
7f7fef04 | 31 | static void compute_trt_inverse (); |
dcfdbac7 JB |
32 | |
33 | DEFUN ("case-table-p", Fcase_table_p, Scase_table_p, 1, 1, 0, | |
2858a1c1 | 34 | "Return t iff OBJECT is a case table.\n\ |
dcfdbac7 | 35 | See `set-case-table' for more information on these data structures.") |
2858a1c1 EN |
36 | (object) |
37 | Lisp_Object object; | |
dcfdbac7 | 38 | { |
4b3bd052 | 39 | Lisp_Object up, canon, eqv; |
dcfdbac7 | 40 | |
2858a1c1 | 41 | if (! CHAR_TABLE_P (object)) |
7f7fef04 | 42 | return Qnil; |
2858a1c1 | 43 | if (! EQ (XCHAR_TABLE (object)->purpose, Qcase_table)) |
7f7fef04 | 44 | return Qnil; |
dcfdbac7 | 45 | |
2858a1c1 EN |
46 | up = XCHAR_TABLE (object)->extras[0]; |
47 | canon = XCHAR_TABLE (object)->extras[1]; | |
48 | eqv = XCHAR_TABLE (object)->extras[2]; | |
7f7fef04 RS |
49 | |
50 | return ((NILP (up) || CHAR_TABLE_P (up)) | |
d427b66a | 51 | && ((NILP (canon) && NILP (eqv)) |
7f7fef04 RS |
52 | || (CHAR_TABLE_P (canon) |
53 | && (NILP (eqv) || CHAR_TABLE_P (eqv)))) | |
dcfdbac7 JB |
54 | ? Qt : Qnil); |
55 | } | |
56 | ||
57 | static Lisp_Object | |
58 | check_case_table (obj) | |
59 | Lisp_Object obj; | |
60 | { | |
61 | register Lisp_Object tem; | |
62 | ||
d427b66a | 63 | while (tem = Fcase_table_p (obj), NILP (tem)) |
b37902c8 | 64 | obj = wrong_type_argument (Qcase_table_p, obj); |
dcfdbac7 JB |
65 | return (obj); |
66 | } | |
67 | ||
68 | DEFUN ("current-case-table", Fcurrent_case_table, Scurrent_case_table, 0, 0, 0, | |
69 | "Return the case table of the current buffer.") | |
70 | () | |
71 | { | |
7f7fef04 | 72 | return current_buffer->downcase_table; |
dcfdbac7 JB |
73 | } |
74 | ||
a1de6b4b | 75 | DEFUN ("standard-case-table", Fstandard_case_table, Sstandard_case_table, 0, 0, 0, |
dcfdbac7 JB |
76 | "Return the standard case table.\n\ |
77 | This is the one used for new buffers.") | |
78 | () | |
79 | { | |
7f7fef04 | 80 | return Vascii_downcase_table; |
dcfdbac7 JB |
81 | } |
82 | ||
d9da9451 JB |
83 | static Lisp_Object set_case_table (); |
84 | ||
dcfdbac7 JB |
85 | DEFUN ("set-case-table", Fset_case_table, Sset_case_table, 1, 1, 0, |
86 | "Select a new case table for the current buffer.\n\ | |
c7608f45 RS |
87 | A case table is a char-table which maps characters\n\ |
88 | to their lower-case equivalents. It also has three \"extra\" slots\n\ | |
89 | which may be additional char-tables or nil.\n\ | |
7f7fef04 | 90 | These slots are called UPCASE, CANONICALIZE and EQUIVALENCES.\n\ |
dcfdbac7 JB |
91 | UPCASE maps each character to its upper-case equivalent;\n\ |
92 | if lower and upper case characters are in 1-1 correspondence,\n\ | |
93 | you may use nil and the upcase table will be deduced from DOWNCASE.\n\ | |
94 | CANONICALIZE maps each character to a canonical equivalent;\n\ | |
95 | any two characters that are related by case-conversion have the same\n\ | |
5a0fd72f RS |
96 | canonical equivalent character; it may be nil, in which case it is\n\ |
97 | deduced from DOWNCASE and UPCASE.\n\ | |
dcfdbac7 | 98 | EQUIVALENCES is a map that cyclicly permutes each equivalence class\n\ |
5a0fd72f RS |
99 | (of characters with the same canonical equivalent); it may be nil,\n\ |
100 | in which case it is deduced from CANONICALIZE.") | |
dcfdbac7 JB |
101 | (table) |
102 | Lisp_Object table; | |
103 | { | |
d9da9451 | 104 | return set_case_table (table, 0); |
dcfdbac7 JB |
105 | } |
106 | ||
a1de6b4b | 107 | DEFUN ("set-standard-case-table", Fset_standard_case_table, Sset_standard_case_table, 1, 1, 0, |
dcfdbac7 JB |
108 | "Select a new standard case table for new buffers.\n\ |
109 | See `set-case-table' for more info on case tables.") | |
110 | (table) | |
111 | Lisp_Object table; | |
112 | { | |
d9da9451 | 113 | return set_case_table (table, 1); |
dcfdbac7 JB |
114 | } |
115 | ||
d9da9451 | 116 | static Lisp_Object |
dcfdbac7 JB |
117 | set_case_table (table, standard) |
118 | Lisp_Object table; | |
119 | int standard; | |
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); |
4b3bd052 | 132 | compute_trt_inverse (XCHAR_TABLE (table), XCHAR_TABLE (up)); |
7f7fef04 | 133 | XCHAR_TABLE (table)->extras[0] = up; |
dcfdbac7 JB |
134 | } |
135 | ||
d427b66a | 136 | if (NILP (canon)) |
dcfdbac7 JB |
137 | { |
138 | register int i; | |
7f7fef04 | 139 | Lisp_Object *upvec = XCHAR_TABLE (up)->contents; |
4b3bd052 | 140 | Lisp_Object *downvec = XCHAR_TABLE (table)->contents; |
dcfdbac7 | 141 | |
4b3bd052 | 142 | canon = Fmake_char_table (Qcase_table, Qnil); |
dcfdbac7 JB |
143 | |
144 | /* Set up the CANON vector; for each character, | |
145 | this sequence of upcasing and downcasing ought to | |
146 | get the "preferred" lowercase equivalent. */ | |
147 | for (i = 0; i < 256; i++) | |
7f7fef04 RS |
148 | XCHAR_TABLE (canon)->contents[i] = downvec[upvec[downvec[i]]]; |
149 | XCHAR_TABLE (table)->extras[1] = canon; | |
5a0fd72f RS |
150 | } |
151 | ||
152 | if (NILP (eqv)) | |
153 | { | |
7f7fef04 RS |
154 | eqv = Fmake_char_table (Qcase_table, Qnil); |
155 | compute_trt_inverse (XCHAR_TABLE (canon), XCHAR_TABLE (eqv)); | |
4b3bd052 | 156 | XCHAR_TABLE (table)->extras[2] = eqv; |
dcfdbac7 JB |
157 | } |
158 | ||
159 | if (standard) | |
4b3bd052 | 160 | Vascii_downcase_table = table; |
dcfdbac7 | 161 | else |
6c6fcbf8 RS |
162 | { |
163 | current_buffer->downcase_table = table; | |
164 | current_buffer->upcase_table = up; | |
165 | current_buffer->case_canon_table = canon; | |
166 | current_buffer->case_eqv_table = eqv; | |
167 | } | |
7f7fef04 | 168 | |
dcfdbac7 JB |
169 | return table; |
170 | } | |
171 | \f | |
172 | /* Given a translate table TRT, store the inverse mapping into INVERSE. | |
173 | Since TRT is not one-to-one, INVERSE is not a simple mapping. | |
174 | Instead, it divides the space of characters into equivalence classes. | |
175 | All characters in a given class form one circular list, chained through | |
176 | the elements of INVERSE. */ | |
177 | ||
7f7fef04 | 178 | static void |
dcfdbac7 | 179 | compute_trt_inverse (trt, inverse) |
7f7fef04 | 180 | struct Lisp_Char_Table *trt, *inverse; |
dcfdbac7 JB |
181 | { |
182 | register int i = 0400; | |
183 | register unsigned char c, q; | |
184 | ||
185 | while (i--) | |
7f7fef04 | 186 | inverse->contents[i] = i; |
dcfdbac7 JB |
187 | i = 0400; |
188 | while (i--) | |
189 | { | |
7f7fef04 | 190 | if ((q = trt->contents[i]) != (unsigned char) i) |
dcfdbac7 | 191 | { |
7f7fef04 RS |
192 | c = inverse->contents[q]; |
193 | inverse->contents[q] = i; | |
194 | inverse->contents[i] = c; | |
dcfdbac7 JB |
195 | } |
196 | } | |
197 | } | |
198 | \f | |
199 | init_casetab_once () | |
200 | { | |
201 | register int i; | |
7f7fef04 RS |
202 | Lisp_Object down, up; |
203 | Qcase_table = intern ("case-table"); | |
204 | staticpro (&Qcase_table); | |
205 | ||
206 | /* Intern this now in case it isn't already done. | |
207 | Setting this variable twice is harmless. | |
208 | But don't staticpro it here--that is done in alloc.c. */ | |
209 | Qchar_table_extra_slots = intern ("char-table-extra-slots"); | |
dcfdbac7 | 210 | |
7f7fef04 RS |
211 | /* Now we are ready to set up this property, so we can |
212 | create char tables. */ | |
4b3bd052 | 213 | Fput (Qcase_table, Qchar_table_extra_slots, make_number (3)); |
7f7fef04 RS |
214 | |
215 | down = Fmake_char_table (Qcase_table, Qnil); | |
216 | Vascii_downcase_table = down; | |
dcfdbac7 JB |
217 | |
218 | for (i = 0; i < 256; i++) | |
7f7fef04 RS |
219 | XCHAR_TABLE (down)->contents[i] = (i >= 'A' && i <= 'Z') ? i + 040 : i; |
220 | ||
221 | XCHAR_TABLE (down)->extras[1] = Fcopy_sequence (down); | |
dcfdbac7 | 222 | |
7f7fef04 RS |
223 | up = Fmake_char_table (Qcase_table, Qnil); |
224 | XCHAR_TABLE (down)->extras[0] = up; | |
dcfdbac7 JB |
225 | |
226 | for (i = 0; i < 256; i++) | |
7f7fef04 | 227 | XCHAR_TABLE (up)->contents[i] |
dcfdbac7 JB |
228 | = ((i >= 'A' && i <= 'Z') |
229 | ? i + ('a' - 'A') | |
230 | : ((i >= 'a' && i <= 'z') | |
231 | ? i + ('A' - 'a') | |
232 | : i)); | |
7f7fef04 RS |
233 | |
234 | XCHAR_TABLE (down)->extras[2] = Fcopy_sequence (up); | |
dcfdbac7 JB |
235 | } |
236 | ||
237 | syms_of_casetab () | |
238 | { | |
239 | Qcase_table_p = intern ("case-table-p"); | |
240 | staticpro (&Qcase_table_p); | |
7f7fef04 | 241 | |
8f84b1a1 | 242 | staticpro (&Vascii_canon_table); |
dcfdbac7 | 243 | staticpro (&Vascii_downcase_table); |
8f84b1a1 EN |
244 | staticpro (&Vascii_eqv_table); |
245 | staticpro (&Vascii_upcase_table); | |
dcfdbac7 JB |
246 | |
247 | defsubr (&Scase_table_p); | |
248 | defsubr (&Scurrent_case_table); | |
249 | defsubr (&Sstandard_case_table); | |
250 | defsubr (&Sset_case_table); | |
251 | defsubr (&Sset_standard_case_table); | |
dcfdbac7 | 252 | } |