category.c 16.9 KB
Newer Older
Karl Heuer's avatar
Karl Heuer committed
1
/* GNU Emacs routines to deal with category tables.
2

3
Copyright (C) 1998, 2001-2012  Free Software Foundation, Inc.
4 5 6 7 8 9 10
Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
  2005, 2006, 2007, 2008, 2009, 2010, 2011
  National Institute of Advanced Industrial Science and Technology (AIST)
  Registration Number H14PRO021
Copyright (C) 2003
  National Institute of Advanced Industrial Science and Technology (AIST)
  Registration Number H13PRO009
Karl Heuer's avatar
Karl Heuer committed
11 12 13

This file is part of GNU Emacs.

14
GNU Emacs is free software: you can redistribute it and/or modify
Karl Heuer's avatar
Karl Heuer committed
15
it under the terms of the GNU General Public License as published by
16 17
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Karl Heuer's avatar
Karl Heuer committed
18 19 20 21 22 23 24

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
25
along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
Karl Heuer's avatar
Karl Heuer committed
26 27 28 29 30 31


/* Here we handle three objects: category, category set, and category
   table.  Read comments in the file category.h to understand them.  */

#include <config.h>
32 33 34

#define CATEGORY_INLINE EXTERN_INLINE

Karl Heuer's avatar
Karl Heuer committed
35
#include "lisp.h"
Kenichi Handa's avatar
Kenichi Handa committed
36
#include "character.h"
37
#include "buffer.h"
Karl Heuer's avatar
Karl Heuer committed
38 39
#include "charset.h"
#include "category.h"
Stefan Monnier's avatar
Stefan Monnier committed
40
#include "keymap.h"
Karl Heuer's avatar
Karl Heuer committed
41

Paul Eggert's avatar
Paul Eggert committed
42
/* This setter is used only in this file, so it can be private.  */
43
static void
Paul Eggert's avatar
Paul Eggert committed
44 45 46 47 48
bset_category_table (struct buffer *b, Lisp_Object val)
{
  b->INTERNAL_FIELD (category_table) = val;
}

Karl Heuer's avatar
Karl Heuer committed
49 50 51 52 53 54 55 56 57 58
/* The version number of the latest category table.  Each category
   table has a unique version number.  It is assigned a new number
   also when it is modified.  When a regular expression is compiled
   into the struct re_pattern_buffer, the version number of the
   category table (of the current buffer) at that moment is also
   embedded in the structure.

   For the moment, we are not using this feature.  */
static int category_table_version;

59
static Lisp_Object Qcategory_table, Qcategoryp, Qcategorysetp, Qcategory_table_p;
Karl Heuer's avatar
Karl Heuer committed
60

61 62 63 64 65
/* Make CATEGORY_SET includes (if VAL is t) or excludes (if VAL is
   nil) CATEGORY.  */
#define SET_CATEGORY_SET(category_set, category, val) \
  set_category_set (category_set, category, val)
static void set_category_set (Lisp_Object, Lisp_Object, Lisp_Object);
Karl Heuer's avatar
Karl Heuer committed
66 67 68

/* Category set staff.  */

69
static Lisp_Object hash_get_category_set (Lisp_Object, Lisp_Object);
70 71

static Lisp_Object
72
hash_get_category_set (Lisp_Object table, Lisp_Object category_set)
73 74
{
  struct Lisp_Hash_Table *h;
75
  ptrdiff_t i;
76
  EMACS_UINT hash;
77 78

  if (NILP (XCHAR_TABLE (table)->extras[1]))
79
    set_char_table_extras
80 81 82 83 84
      (table, 1,
       make_hash_table (Qequal, make_number (DEFAULT_HASH_SIZE),
			make_float (DEFAULT_REHASH_SIZE),
			make_float (DEFAULT_REHASH_THRESHOLD),
			Qnil, Qnil, Qnil));
85 86 87 88 89 90 91 92 93
  h = XHASH_TABLE (XCHAR_TABLE (table)->extras[1]);
  i = hash_lookup (h, category_set, &hash);
  if (i >= 0)
    return HASH_KEY (h, i);
  hash_put (h, category_set, Qnil, hash);
  return category_set;
}


Karl Heuer's avatar
Karl Heuer committed
94
DEFUN ("make-category-set", Fmake_category_set, Smake_category_set, 1, 1, 0,
95 96 97 98
       doc: /* Return a newly created category-set which contains CATEGORIES.
CATEGORIES is a string of category mnemonics.
The value is a bool-vector which has t at the indices corresponding to
those categories.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
99
  (Lisp_Object categories)
Karl Heuer's avatar
Karl Heuer committed
100 101 102 103
{
  Lisp_Object val;
  int len;

104
  CHECK_STRING (categories);
Karl Heuer's avatar
Karl Heuer committed
105 106
  val = MAKE_CATEGORY_SET;

107
  if (STRING_MULTIBYTE (categories))
108
    error ("Multibyte string in `make-category-set'");
109

110
  len = SCHARS (categories);
Karl Heuer's avatar
Karl Heuer committed
111 112
  while (--len >= 0)
    {
113
      Lisp_Object category;
Karl Heuer's avatar
Karl Heuer committed
114

115
      XSETFASTINT (category, SREF (categories, len));
116
      CHECK_CATEGORY (category);
Karl Heuer's avatar
Karl Heuer committed
117 118 119 120 121 122 123 124
      SET_CATEGORY_SET (val, category, Qt);
    }
  return val;
}


/* Category staff.  */

125
static Lisp_Object check_category_table (Lisp_Object table);
Karl Heuer's avatar
Karl Heuer committed
126 127

DEFUN ("define-category", Fdefine_category, Sdefine_category, 2, 3, 0,
Kenichi Handa's avatar
Kenichi Handa committed
128 129
       doc: /* Define CATEGORY as a category which is described by DOCSTRING.
CATEGORY should be an ASCII printing character in the range ` ' to `~'.
130 131 132
DOCSTRING is the documentation string of the category.  The first line
should be a terse text (preferably less than 16 characters),
and the rest lines should be the full description.
133
The category is defined only in category table TABLE, which defaults to
Kenichi Handa's avatar
Kenichi Handa committed
134
the current buffer's category table.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
135
  (Lisp_Object category, Lisp_Object docstring, Lisp_Object table)
Karl Heuer's avatar
Karl Heuer committed
136
{
137 138
  CHECK_CATEGORY (category);
  CHECK_STRING (docstring);
Karl Heuer's avatar
Karl Heuer committed
139 140 141
  table = check_category_table (table);

  if (!NILP (CATEGORY_DOCSTRING (table, XFASTINT (category))))
142
    error ("Category `%c' is already defined", (int) XFASTINT (category));
143 144
  if (!NILP (Vpurify_flag))
    docstring = Fpurecopy (docstring);
145
  SET_CATEGORY_DOCSTRING (table, XFASTINT (category), docstring);
Karl Heuer's avatar
Karl Heuer committed
146 147 148 149 150

  return Qnil;
}

DEFUN ("category-docstring", Fcategory_docstring, Scategory_docstring, 1, 2, 0,
Kenichi Handa's avatar
Kenichi Handa committed
151 152 153
       doc: /* Return the documentation string of CATEGORY, as defined in TABLE.
TABLE should be a category table and defaults to the current buffer's
category table.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
154
  (Lisp_Object category, Lisp_Object table)
Karl Heuer's avatar
Karl Heuer committed
155
{
156
  CHECK_CATEGORY (category);
Karl Heuer's avatar
Karl Heuer committed
157 158 159 160 161 162 163
  table = check_category_table (table);

  return CATEGORY_DOCSTRING (table, XFASTINT (category));
}

DEFUN ("get-unused-category", Fget_unused_category, Sget_unused_category,
       0, 1, 0,
Kenichi Handa's avatar
Kenichi Handa committed
164
       doc: /* Return a category which is not yet defined in TABLE.
165
If no category remains available, return nil.
Kenichi Handa's avatar
Kenichi Handa committed
166
The optional argument TABLE specifies which category table to modify;
167
it defaults to the current buffer's category table.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
168
  (Lisp_Object table)
Karl Heuer's avatar
Karl Heuer committed
169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184
{
  int i;

  table = check_category_table (table);

  for (i = ' '; i <= '~'; i++)
    if (NILP (CATEGORY_DOCSTRING (table, i)))
      return make_number (i);

  return Qnil;
}


/* Category-table staff.  */

DEFUN ("category-table-p", Fcategory_table_p, Scategory_table_p, 1, 1, 0,
185
       doc: /* Return t if ARG is a category table.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
186
  (Lisp_Object arg)
Karl Heuer's avatar
Karl Heuer committed
187 188
{
  if (CHAR_TABLE_P (arg)
189
      && EQ (XCHAR_TABLE (arg)->purpose, Qcategory_table))
Karl Heuer's avatar
Karl Heuer committed
190 191 192 193 194 195 196 197 198
    return Qt;
  return Qnil;
}

/* If TABLE is nil, return the current category table.  If TABLE is
   not nil, check the validity of TABLE as a category table.  If
   valid, return TABLE itself, but if not valid, signal an error of
   wrong-type-argument.  */

199
static Lisp_Object
200
check_category_table (Lisp_Object table)
Karl Heuer's avatar
Karl Heuer committed
201 202
{
  if (NILP (table))
Tom Tromey's avatar
Tom Tromey committed
203
    return BVAR (current_buffer, category_table);
204
  CHECK_TYPE (!NILP (Fcategory_table_p (table)), Qcategory_table_p, table);
Karl Heuer's avatar
Karl Heuer committed
205
  return table;
206
}
Karl Heuer's avatar
Karl Heuer committed
207 208

DEFUN ("category-table", Fcategory_table, Scategory_table, 0, 0, 0,
209 210
       doc: /* Return the current category table.
This is the one specified by the current buffer.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
211
  (void)
Karl Heuer's avatar
Karl Heuer committed
212
{
Tom Tromey's avatar
Tom Tromey committed
213
  return BVAR (current_buffer, category_table);
Karl Heuer's avatar
Karl Heuer committed
214 215 216 217
}

DEFUN ("standard-category-table", Fstandard_category_table,
   Sstandard_category_table, 0, 0, 0,
218 219
       doc: /* Return the standard category table.
This is the one used for new buffers.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
220
  (void)
Karl Heuer's avatar
Karl Heuer committed
221 222 223 224
{
  return Vstandard_category_table;
}

Kenichi Handa's avatar
Kenichi Handa committed
225 226

static void
227
copy_category_entry (Lisp_Object table, Lisp_Object c, Lisp_Object val)
Kenichi Handa's avatar
Kenichi Handa committed
228
{
229
  val = Fcopy_sequence (val);
Kenichi Handa's avatar
Kenichi Handa committed
230 231
  if (CONSP (c))
    char_table_set_range (table, XINT (XCAR (c)), XINT (XCDR (c)), val);
232
  else
Kenichi Handa's avatar
Kenichi Handa committed
233
    char_table_set (table, XINT (c), val);
Kenichi Handa's avatar
Kenichi Handa committed
234 235
}

Karl Heuer's avatar
Karl Heuer committed
236 237
/* Return a copy of category table TABLE.  We can't simply use the
   function copy-sequence because no contents should be shared between
238
   the original and the copy.  This function is called recursively by
239
   binding TABLE to a sub char table.  */
Karl Heuer's avatar
Karl Heuer committed
240

241
static Lisp_Object
242
copy_category_table (Lisp_Object table)
Karl Heuer's avatar
Karl Heuer committed
243
{
Kenichi Handa's avatar
Kenichi Handa committed
244
  table = copy_char_table (table);
Karl Heuer's avatar
Karl Heuer committed
245

Kenichi Handa's avatar
Kenichi Handa committed
246
  if (! NILP (XCHAR_TABLE (table)->defalt))
Paul Eggert's avatar
Paul Eggert committed
247 248
    set_char_table_defalt (table,
			   Fcopy_sequence (XCHAR_TABLE (table)->defalt));
249
  set_char_table_extras
250
    (table, 0, Fcopy_sequence (XCHAR_TABLE (table)->extras[0]));
Kenichi Handa's avatar
Kenichi Handa committed
251
  map_char_table (copy_category_entry, Qnil, table, table);
252

Karl Heuer's avatar
Karl Heuer committed
253 254 255 256 257
  return table;
}

DEFUN ("copy-category-table", Fcopy_category_table, Scopy_category_table,
       0, 1, 0,
258 259
       doc: /* Construct a new category table and return it.
It is a copy of the TABLE, which defaults to the standard category table.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
260
  (Lisp_Object table)
Karl Heuer's avatar
Karl Heuer committed
261 262 263 264 265 266
{
  if (!NILP (table))
    check_category_table (table);
  else
    table = Vstandard_category_table;

267
  return copy_category_table (table);
Karl Heuer's avatar
Karl Heuer committed
268 269
}

270 271
DEFUN ("make-category-table", Fmake_category_table, Smake_category_table,
       0, 0, 0,
272
       doc: /* Construct a new and empty category table and return it.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
273
  (void)
274 275
{
  Lisp_Object val;
Kenichi Handa's avatar
Kenichi Handa committed
276
  int i;
277 278

  val = Fmake_char_table (Qcategory_table, Qnil);
Paul Eggert's avatar
Paul Eggert committed
279
  set_char_table_defalt (val, MAKE_CATEGORY_SET);
Kenichi Handa's avatar
Kenichi Handa committed
280
  for (i = 0; i < (1 << CHARTAB_SIZE_BITS_0); i++)
281
    set_char_table_contents (val, i, MAKE_CATEGORY_SET);
282 283 284 285 286
  Fset_char_table_extra_slot (val, make_number (0),
			      Fmake_vector (make_number (95), Qnil));
  return val;
}

Karl Heuer's avatar
Karl Heuer committed
287
DEFUN ("set-category-table", Fset_category_table, Sset_category_table, 1, 1, 0,
Kenichi Handa's avatar
Kenichi Handa committed
288 289
       doc: /* Specify TABLE as the category table for the current buffer.
Return TABLE.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
290
  (Lisp_Object table)
Karl Heuer's avatar
Karl Heuer committed
291
{
292
  int idx;
Karl Heuer's avatar
Karl Heuer committed
293
  table = check_category_table (table);
Paul Eggert's avatar
Paul Eggert committed
294
  bset_category_table (current_buffer, table);
Karl Heuer's avatar
Karl Heuer committed
295
  /* Indicate that this buffer now has a specified category table.  */
Gerd Moellmann's avatar
Gerd Moellmann committed
296 297
  idx = PER_BUFFER_VAR_IDX (category_table);
  SET_PER_BUFFER_VALUE_P (current_buffer, idx, 1);
Karl Heuer's avatar
Karl Heuer committed
298 299 300 301
  return table;
}


Kenichi Handa's avatar
Kenichi Handa committed
302
Lisp_Object
303
char_category_set (int c)
Kenichi Handa's avatar
Kenichi Handa committed
304
{
Tom Tromey's avatar
Tom Tromey committed
305
  return CHAR_TABLE_REF (BVAR (current_buffer, category_table), c);
Kenichi Handa's avatar
Kenichi Handa committed
306 307
}

Karl Heuer's avatar
Karl Heuer committed
308
DEFUN ("char-category-set", Fchar_category_set, Schar_category_set, 1, 1, 0,
309 310
       doc: /* Return the category set of CHAR.
usage: (char-category-set CHAR)  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
311
  (Lisp_Object ch)
Karl Heuer's avatar
Karl Heuer committed
312
{
313
  CHECK_CHARACTER (ch);
Karl Heuer's avatar
Karl Heuer committed
314 315 316 317 318
  return CATEGORY_SET (XFASTINT (ch));
}

DEFUN ("category-set-mnemonics", Fcategory_set_mnemonics,
       Scategory_set_mnemonics, 1, 1, 0,
319 320
       doc: /* Return a string containing mnemonics of the categories in CATEGORY-SET.
CATEGORY-SET is a bool-vector, and the categories \"in\" it are those
Kenichi Handa's avatar
Kenichi Handa committed
321
that are indexes where t occurs in the bool-vector.
322
The return value is a string containing those same categories.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
323
  (Lisp_Object category_set)
Karl Heuer's avatar
Karl Heuer committed
324 325 326 327
{
  int i, j;
  char str[96];

328
  CHECK_CATEGORY_SET (category_set);
Karl Heuer's avatar
Karl Heuer committed
329 330 331 332 333 334 335 336 337 338

  j = 0;
  for (i = 32; i < 127; i++)
    if (CATEGORY_MEMBER (i, category_set))
      str[j++] = i;
  str[j] = '\0';

  return build_string (str);
}

339
static void
340
set_category_set (Lisp_Object category_set, Lisp_Object category, Lisp_Object val)
Karl Heuer's avatar
Karl Heuer committed
341 342 343 344 345 346 347 348 349 350 351 352 353 354
{
  do {
    int idx = XINT (category) / 8;
    unsigned char bits = 1 << (XINT (category) % 8);

    if (NILP (val))
      XCATEGORY_SET (category_set)->data[idx] &= ~bits;
    else
      XCATEGORY_SET (category_set)->data[idx] |= bits;
  } while (0);
}

DEFUN ("modify-category-entry", Fmodify_category_entry,
       Smodify_category_entry, 2, 4, 0,
355 356
       doc: /* Modify the category set of CHARACTER by adding CATEGORY to it.
The category is changed only for table TABLE, which defaults to
357 358 359
the current buffer's category table.
CHARACTER can be either a single character or a cons representing the
lower and upper ends of an inclusive character range to modify.
360 361
If optional fourth argument RESET is non-nil,
then delete CATEGORY from the category set instead of adding it.  */)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
362
  (Lisp_Object character, Lisp_Object category, Lisp_Object table, Lisp_Object reset)
Karl Heuer's avatar
Karl Heuer committed
363 364
{
  Lisp_Object set_value;	/* Actual value to be set in category sets.  */
365
  Lisp_Object category_set;
Kenichi Handa's avatar
Kenichi Handa committed
366 367
  int start, end;
  int from, to;
Karl Heuer's avatar
Karl Heuer committed
368

Kenichi Handa's avatar
Kenichi Handa committed
369
  if (INTEGERP (character))
Karl Heuer's avatar
Karl Heuer committed
370
    {
Kenichi Handa's avatar
Kenichi Handa committed
371 372
      CHECK_CHARACTER (character);
      start = end = XFASTINT (character);
Karl Heuer's avatar
Karl Heuer committed
373
    }
Kenichi Handa's avatar
Kenichi Handa committed
374
  else
Karl Heuer's avatar
Karl Heuer committed
375
    {
Kenichi Handa's avatar
Kenichi Handa committed
376
      CHECK_CONS (character);
Kenichi Handa's avatar
Kenichi Handa committed
377 378
      CHECK_CHARACTER_CAR (character);
      CHECK_CHARACTER_CDR (character);
Kenichi Handa's avatar
Kenichi Handa committed
379 380
      start = XFASTINT (XCAR (character));
      end = XFASTINT (XCDR (character));
Karl Heuer's avatar
Karl Heuer committed
381 382
    }

383
  CHECK_CATEGORY (category);
Karl Heuer's avatar
Karl Heuer committed
384 385 386
  table = check_category_table (table);

  if (NILP (CATEGORY_DOCSTRING (table, XFASTINT (category))))
387
    error ("Undefined category: %c", (int) XFASTINT (category));
Karl Heuer's avatar
Karl Heuer committed
388 389 390

  set_value = NILP (reset) ? Qt : Qnil;

Kenichi Handa's avatar
Kenichi Handa committed
391
  while (start <= end)
Karl Heuer's avatar
Karl Heuer committed
392
    {
393
      from = start, to = end;
Kenichi Handa's avatar
Kenichi Handa committed
394
      category_set = char_table_ref_and_range (table, start, &from, &to);
395
      if (CATEGORY_MEMBER (XFASTINT (category), category_set) != NILP (reset))
Kenichi Handa's avatar
Kenichi Handa committed
396
	{
397 398
	  category_set = Fcopy_sequence (category_set);
	  SET_CATEGORY_SET (category_set, category, set_value);
399 400
	  category_set = hash_get_category_set (table, category_set);
	  char_table_set_range (table, start, to, category_set);
Kenichi Handa's avatar
Kenichi Handa committed
401 402
	}
      start = to + 1;
Karl Heuer's avatar
Karl Heuer committed
403 404 405 406 407
    }

  return Qnil;
}

408 409
/* Return true if there is a word boundary between two word-constituent
   characters C1 and C2 if they appear in this order.
Karl Heuer's avatar
Karl Heuer committed
410 411 412
   Use the macro WORD_BOUNDARY_P instead of calling this function
   directly.  */

413
bool
414
word_boundary_p (int c1, int c2)
Karl Heuer's avatar
Karl Heuer committed
415 416 417
{
  Lisp_Object category_set1, category_set2;
  Lisp_Object tail;
418
  bool default_result;
Karl Heuer's avatar
Karl Heuer committed
419

420 421
  if (EQ (CHAR_TABLE_REF (Vchar_script_table, c1),
	  CHAR_TABLE_REF (Vchar_script_table, c2)))
Karl Heuer's avatar
Karl Heuer committed
422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438
    {
      tail = Vword_separating_categories;
      default_result = 0;
    }
  else
    {
      tail = Vword_combining_categories;
      default_result = 1;
    }

  category_set1 = CATEGORY_SET (c1);
  if (NILP (category_set1))
    return default_result;
  category_set2 = CATEGORY_SET (c2);
  if (NILP (category_set2))
    return default_result;

439
  for (; CONSP (tail); tail = XCDR (tail))
Karl Heuer's avatar
Karl Heuer committed
440
    {
441
      Lisp_Object elt = XCAR (tail);
Karl Heuer's avatar
Karl Heuer committed
442 443

      if (CONSP (elt)
444 445
	  && (NILP (XCAR (elt))
	      || (CATEGORYP (XCAR (elt))
446 447
		  && CATEGORY_MEMBER (XFASTINT (XCAR (elt)), category_set1)
		  && ! CATEGORY_MEMBER (XFASTINT (XCAR (elt)), category_set2)))
448 449
	  && (NILP (XCDR (elt))
	      || (CATEGORYP (XCDR (elt))
450
		  && ! CATEGORY_MEMBER (XFASTINT (XCDR (elt)), category_set1)
451
		  && CATEGORY_MEMBER (XFASTINT (XCDR (elt)), category_set2))))
Karl Heuer's avatar
Karl Heuer committed
452 453 454 455 456 457
	return !default_result;
    }
  return default_result;
}


Andreas Schwab's avatar
Andreas Schwab committed
458
void
459
init_category_once (void)
Karl Heuer's avatar
Karl Heuer committed
460 461
{
  /* This has to be done here, before we call Fmake_char_table.  */
462
  DEFSYM (Qcategory_table, "category-table");
Karl Heuer's avatar
Karl Heuer committed
463 464 465 466

  /* Intern this now in case it isn't already done.
     Setting this variable twice is harmless.
     But don't staticpro it here--that is done in alloc.c.  */
Dan Nicolaescu's avatar
Dan Nicolaescu committed
467
  Qchar_table_extra_slots = intern_c_string ("char-table-extra-slots");
Karl Heuer's avatar
Karl Heuer committed
468 469 470 471 472 473

  /* Now we are ready to set up this property, so we can
     create category tables.  */
  Fput (Qcategory_table, Qchar_table_extra_slots, make_number (2));

  Vstandard_category_table = Fmake_char_table (Qcategory_table, Qnil);
474
  /* Set a category set which contains nothing to the default.  */
Paul Eggert's avatar
Paul Eggert committed
475
  set_char_table_defalt (Vstandard_category_table, MAKE_CATEGORY_SET);
476
  Fset_char_table_extra_slot (Vstandard_category_table, make_number (0),
Karl Heuer's avatar
Karl Heuer committed
477 478 479
			      Fmake_vector (make_number (95), Qnil));
}

Andreas Schwab's avatar
Andreas Schwab committed
480
void
481
syms_of_category (void)
Karl Heuer's avatar
Karl Heuer committed
482
{
483 484 485
  DEFSYM (Qcategoryp, "categoryp");
  DEFSYM (Qcategorysetp, "categorysetp");
  DEFSYM (Qcategory_table_p, "category-table-p");
Karl Heuer's avatar
Karl Heuer committed
486

487
  DEFVAR_LISP ("word-combining-categories", Vword_combining_categories,
488 489 490
	       doc: /* List of pair (cons) of categories to determine word boundary.

Emacs treats a sequence of word constituent characters as a single
Glenn Morris's avatar
Glenn Morris committed
491
word (i.e. finds no word boundary between them) only if they belong to
492
the same script.  But, exceptions are allowed in the following cases.
493

494
\(1) The case that characters are in different scripts is controlled
495 496
by the variable `word-combining-categories'.

497
Emacs finds no word boundary between characters of different scripts
498 499 500 501 502 503
if they have categories matching some element of this list.

More precisely, if an element of this list is a cons of category CAT1
and CAT2, and a multibyte character C1 which has CAT1 is followed by
C2 which has CAT2, there's no word boundary between C1 and C2.

504 505 506
For instance, to tell that Han characters followed by Hiragana
characters can form a single word, the element `(?C . ?H)' should be
in this list.
507

508
\(2) The case that character are in the same script is controlled by
509 510
the variable `word-separating-categories'.

511
Emacs finds a word boundary between characters of the same script
512 513 514
if they have categories matching some element of this list.

More precisely, if an element of this list is a cons of category CAT1
515 516 517
and CAT2, and a multibyte character C1 which has CAT1 but not CAT2 is
followed by C2 which has CAT2 but not CAT1, there's a word boundary
between C1 and C2.
518

519 520 521
For instance, to tell that there's a word boundary between Hiragana
and Katakana (both are in the same script `kana'),
the element `(?H . ?K) should be in this list.  */);
Karl Heuer's avatar
Karl Heuer committed
522 523 524

  Vword_combining_categories = Qnil;

525
  DEFVAR_LISP ("word-separating-categories", Vword_separating_categories,
526 527
	       doc: /* List of pair (cons) of categories to determine word boundary.
See the documentation of the variable `word-combining-categories'.  */);
Karl Heuer's avatar
Karl Heuer committed
528 529 530 531 532 533 534 535 536 537 538

  Vword_separating_categories = Qnil;

  defsubr (&Smake_category_set);
  defsubr (&Sdefine_category);
  defsubr (&Scategory_docstring);
  defsubr (&Sget_unused_category);
  defsubr (&Scategory_table_p);
  defsubr (&Scategory_table);
  defsubr (&Sstandard_category_table);
  defsubr (&Scopy_category_table);
539
  defsubr (&Smake_category_table);
Karl Heuer's avatar
Karl Heuer committed
540 541 542 543 544 545 546
  defsubr (&Sset_category_table);
  defsubr (&Schar_category_set);
  defsubr (&Scategory_set_mnemonics);
  defsubr (&Smodify_category_entry);

  category_table_version = 0;
}