src/category.c

   1 /* GNU Emacs routines to deal with category tables.
   2    Copyright (C) 1995, 1997 Electrotechnical Laboratory, JAPAN.
   3    Licensed to the Free Software Foundation.
   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
   9 the Free Software Foundation; either version 2, or (at your option)
  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
  19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22
  23 /* Here we handle three objects: category, category set, and category
  24    table.  Read comments in the file category.h to understand them.  */
  25
  26 #include <config.h>
  27 #include <ctype.h>
  28 #include "lisp.h"
  29 #include "buffer.h"
  30 #include "charset.h"
  31 #include "category.h"
  32
  33 /* The version number of the latest category table.  Each category
  34    table has a unique version number.  It is assigned a new number
  35    also when it is modified.  When a regular expression is compiled
  36    into the struct re_pattern_buffer, the version number of the
  37    category table (of the current buffer) at that moment is also
  38    embedded in the structure.
  39
  40    For the moment, we are not using this feature.  */
  41 static int category_table_version;
  42
  43 Lisp_Object Qcategory_table, Qcategoryp, Qcategorysetp, Qcategory_table_p;
  44
  45 /* Variables to determine word boundary.  */
  46 Lisp_Object Vword_combining_categories, Vword_separating_categories;
  47
  48 /* Temporary internal variable used in macro CHAR_HAS_CATEGORY.  */
  49 Lisp_Object _temp_category_set;
  50
  51 \f
  52 /* Category set staff.  */
  53
  54 DEFUN ("make-category-set", Fmake_category_set, Smake_category_set, 1, 1, 0,
  55   "Return a newly created category-set which contains CATEGORIES.\n\
  56 CATEGORIES is a string of category mnemonics.\n\
  57 The value is a bool-vector which has t at the indices corresponding to\n\
  58 those categories.")
  59   (categories)
  60      Lisp_Object categories;
  61 {
  62   Lisp_Object val;
  63   int len;
  64
  65   CHECK_STRING (categories, 0);
  66   val = MAKE_CATEGORY_SET;
  67
  68   if (STRING_MULTIBYTE (categories))
  69     error ("Multibyte string in make-category-set");
  70
  71   len = XSTRING (categories)->size;
  72   while (--len >= 0)
  73     {
  74       Lisp_Object category;
  75
  76       XSETFASTINT (category, XSTRING (categories)->data[len]);
  77       CHECK_CATEGORY (category, 0);
  78       SET_CATEGORY_SET (val, category, Qt);
  79     }
  80   return val;
  81 }
  82
  83 \f
  84 /* Category staff.  */
  85
  86 Lisp_Object check_category_table ();
  87
  88 DEFUN ("define-category", Fdefine_category, Sdefine_category, 2, 3, 0,
  89   "Define CHAR as a category which is described by DOCSTRING.\n\
  90 CHAR should be an ASCII printing character in the range ` ' to `~'.\n\
  91 DOCSTRING is a documentation string of the category.\n\
  92 The category is defined only in category table TABLE, which defaults to\n\
  93  the current buffer's category table.")
  94   (category, docstring, table)
  95      Lisp_Object category, docstring, table;
  96 {
  97   CHECK_CATEGORY (category, 0);
  98   CHECK_STRING (docstring, 1);
  99   table = check_category_table (table);
 100
 101   if (!NILP (CATEGORY_DOCSTRING (table, XFASTINT (category))))
 102     error ("Category `%c' is already defined", XFASTINT (category));
 103   CATEGORY_DOCSTRING (table, XFASTINT (category)) = docstring;
 104
 105   return Qnil;
 106 }
 107
 108 DEFUN ("category-docstring", Fcategory_docstring, Scategory_docstring, 1, 2, 0,
 109   "Return the documentation string of CATEGORY, as defined in CATEGORY-TABLE.")
 110   (category, table)
 111      Lisp_Object category, table;
 112 {
 113   Lisp_Object doc;
 114
 115   CHECK_CATEGORY (category, 0);
 116   table = check_category_table (table);
 117
 118   return CATEGORY_DOCSTRING (table, XFASTINT (category));
 119 }
 120
 121 DEFUN ("get-unused-category", Fget_unused_category, Sget_unused_category,
 122        0, 1, 0,
 123   "Return a category which is not yet defined in CATEGORY-TABLE.\n\
 124 If no category remains available, return nil.\n\
 125 The optional argument CATEGORY-TABLE specifies which category table\n\
 126 to modify; it defaults to the current buffer's category table.")
 127   (table)
 128      Lisp_Object table;
 129 {
 130   int i;
 131   Lisp_Object docstring_vector;
 132
 133   table = check_category_table (table);
 134
 135   for (i = ' '; i <= '~'; i++)
 136     if (NILP (CATEGORY_DOCSTRING (table, i)))
 137       return make_number (i);
 138
 139   return Qnil;
 140 }
 141
 142 \f
 143 /* Category-table staff.  */
 144
 145 DEFUN ("category-table-p", Fcategory_table_p, Scategory_table_p, 1, 1, 0,
 146   "Return t if ARG is a category table.")
 147   (arg)
 148      Lisp_Object arg;
 149 {
 150   if (CHAR_TABLE_P (arg)
 151       && EQ (XCHAR_TABLE (arg)->purpose, Qcategory_table))
 152     return Qt;
 153   return Qnil;
 154 }
 155
 156 /* If TABLE is nil, return the current category table.  If TABLE is
 157    not nil, check the validity of TABLE as a category table.  If
 158    valid, return TABLE itself, but if not valid, signal an error of
 159    wrong-type-argument.  */
 160
 161 Lisp_Object
 162 check_category_table (table)
 163      Lisp_Object table;
 164 {
 165   register Lisp_Object tem;
 166   if (NILP (table))
 167     return current_buffer->category_table;
 168   while (tem = Fcategory_table_p (table), NILP (tem))
 169     table = wrong_type_argument (Qcategory_table_p, table);
 170   return table;
 171 }
 172
 173 DEFUN ("category-table", Fcategory_table, Scategory_table, 0, 0, 0,
 174   "Return the current category table.\n\
 175 This is the one specified by the current buffer.")
 176   ()
 177 {
 178   return current_buffer->category_table;
 179 }
 180
 181 DEFUN ("standard-category-table", Fstandard_category_table,
 182    Sstandard_category_table, 0, 0, 0,
 183   "Return the standard category table.\n\
 184 This is the one used for new buffers.")
 185   ()
 186 {
 187   return Vstandard_category_table;
 188 }
 189
 190 /* Return a copy of category table TABLE.  We can't simply use the
 191    function copy-sequence because no contents should be shared between
 192    the original and the copy.  This function is called recursively by
 193    binding TABLE to a sub char table.  */
 194
 195 Lisp_Object
 196 copy_category_table (table)
 197      Lisp_Object table;
 198 {
 199   Lisp_Object tmp;
 200   int i, to;
 201
 202   if (!NILP (XCHAR_TABLE (table)->top))
 203     {
 204       /* TABLE is a top level char table.
 205          At first, make a copy of tree structure of the table.  */
 206       table = Fcopy_sequence (table);
 207
 208       /* Then, copy elements for single byte characters one by one.  */
 209       for (i = 0; i < CHAR_TABLE_SINGLE_BYTE_SLOTS; i++)
 210         if (!NILP (tmp = XCHAR_TABLE (table)->contents[i]))
 211           XCHAR_TABLE (table)->contents[i] = Fcopy_sequence (tmp);
 212       to = CHAR_TABLE_ORDINARY_SLOTS;
 213
 214       /* Also copy the first (and sole) extra slot.  It is a vector
 215          containing docstring of each category.  */
 216       Fset_char_table_extra_slot
 217         (table, make_number (0),
 218          Fcopy_sequence (Fchar_table_extra_slot (table, make_number (0))));
 219     }
 220   else
 221     {
 222       i  = 32;
 223       to = SUB_CHAR_TABLE_ORDINARY_SLOTS;
 224     }
 225
 226   /* If the table has non-nil default value, copy it.  */
 227   if (!NILP (tmp = XCHAR_TABLE (table)->defalt))
 228     XCHAR_TABLE (table)->defalt = Fcopy_sequence (tmp);
 229
 230   /* At last, copy the remaining elements while paying attention to a
 231      sub char table.  */
 232   for (; i < to; i++)
 233     if (!NILP (tmp = XCHAR_TABLE (table)->contents[i]))
 234       XCHAR_TABLE (table)->contents[i]
 235         = (SUB_CHAR_TABLE_P (tmp)
 236            ? copy_category_table (tmp) : Fcopy_sequence (tmp));
 237
 238   return table;
 239 }
 240
 241 DEFUN ("copy-category-table", Fcopy_category_table, Scopy_category_table,
 242        0, 1, 0,
 243   "Construct a new category table and return it.\n\
 244 It is a copy of the TABLE, which defaults to the standard category table.")
 245   (table)
 246      Lisp_Object table;
 247 {
 248   if (!NILP (table))
 249     check_category_table (table);
 250   else
 251     table = Vstandard_category_table;
 252
 253   return copy_category_table (table);
 254 }
 255
 256 DEFUN ("set-category-table", Fset_category_table, Sset_category_table, 1, 1, 0,
 257   "Specify TABLE as the category table for the current buffer.")
 258   (table)
 259      Lisp_Object table;
 260 {
 261   table = check_category_table (table);
 262   current_buffer->category_table = table;
 263   /* Indicate that this buffer now has a specified category table.  */
 264   current_buffer->local_var_flags
 265     |= XFASTINT (buffer_local_flags.category_table);
 266   return table;
 267 }
 268
 269 \f
 270 DEFUN ("char-category-set", Fchar_category_set, Schar_category_set, 1, 1, 0,
 271   "Return the category set of CHAR.")
 272   (ch)
 273      Lisp_Object ch;
 274 {
 275   Lisp_Object val;
 276   int charset;
 277   unsigned char c1, c2;
 278
 279   CHECK_NUMBER (ch, 0);
 280   return CATEGORY_SET (XFASTINT (ch));
 281 }
 282
 283 DEFUN ("category-set-mnemonics", Fcategory_set_mnemonics,
 284        Scategory_set_mnemonics, 1, 1, 0,
 285   "Return a string containing mnemonics of the categories in CATEGORY-SET.\n\
 286 CATEGORY-SET is a bool-vector, and the categories \"in\" it are those\n\
 287 that are indexes where t occurs the bool-vector.\n\
 288 The return value is a string containing those same categories.")
 289   (category_set)
 290      Lisp_Object category_set;
 291 {
 292   int i, j;
 293   char str[96];
 294
 295   CHECK_CATEGORY_SET (category_set, 0);
 296
 297   j = 0;
 298   for (i = 32; i < 127; i++)
 299     if (CATEGORY_MEMBER (i, category_set))
 300       str[j++] = i;
 301   str[j] = '\0';
 302
 303   return build_string (str);
 304 }
 305
 306 /* Modify all category sets stored under sub char-table TABLE so that
 307    they contain (SET_VALUE is t) or don't contain (SET_VALUE is nil)
 308    CATEGORY.  */
 309
 310 void
 311 modify_lower_category_set (table, category, set_value)
 312      Lisp_Object table, category, set_value;
 313 {
 314   Lisp_Object val;
 315   int i;
 316
 317   if (NILP (XCHAR_TABLE (table)->defalt))
 318     {
 319       val = MAKE_CATEGORY_SET;
 320       SET_CATEGORY_SET (val, category, set_value);
 321       XCHAR_TABLE (table)->defalt = val;
 322     }
 323
 324   for (i = 32; i < SUB_CHAR_TABLE_ORDINARY_SLOTS; i++)
 325     {
 326       val = XCHAR_TABLE (table)->contents[i];
 327
 328       if (CATEGORY_SET_P (val))
 329         SET_CATEGORY_SET (val, category, set_value);
 330       else if (SUB_CHAR_TABLE_P (val))
 331         modify_lower_category_set (val, category, set_value);
 332     }
 333 }
 334
 335 void
 336 set_category_set (category_set, category, val)
 337      Lisp_Object category_set, category, val;
 338 {
 339   do {
 340     int idx = XINT (category) / 8;
 341     unsigned char bits = 1 << (XINT (category) % 8);
 342
 343     if (NILP (val))
 344       XCATEGORY_SET (category_set)->data[idx] &= ~bits;
 345     else
 346       XCATEGORY_SET (category_set)->data[idx] |= bits;
 347   } while (0);
 348 }
 349
 350 DEFUN ("modify-category-entry", Fmodify_category_entry,
 351        Smodify_category_entry, 2, 4, 0,
 352   "Modify the category set of CHARACTER by adding CATEGORY to it.\n\
 353 The category is changed only for table TABLE, which defaults to\n\
 354  the current buffer's category table.\n\
 355 If optional fourth argument RESET is non-nil,\n\
 356  then delete CATEGORY from the category set instead of adding it.")
 357   (character, category, table, reset)
 358      Lisp_Object character, category, table, reset;
 359 {
 360   int c, charset, c1, c2;
 361   Lisp_Object set_value;        /* Actual value to be set in category sets.  */
 362   Lisp_Object val, category_set;
 363
 364   CHECK_NUMBER (character, 0);
 365   c = XINT (character);
 366   CHECK_CATEGORY (category, 1);
 367   table = check_category_table (table);
 368
 369   if (NILP (CATEGORY_DOCSTRING (table, XFASTINT (category))))
 370     error ("Undefined category: %c", XFASTINT (category));
 371
 372   set_value = NILP (reset) ? Qt : Qnil;
 373
 374   if (c < CHAR_TABLE_SINGLE_BYTE_SLOTS)
 375     {
 376       val = XCHAR_TABLE (table)->contents[c];
 377       if (!CATEGORY_SET_P (val))
 378         XCHAR_TABLE (table)->contents[c] = (val = MAKE_CATEGORY_SET);
 379       SET_CATEGORY_SET (val, category, set_value);
 380       return Qnil;
 381     }
 382
 383   SPLIT_NON_ASCII_CHAR (c, charset, c1, c2);
 384
 385   /* The top level table.  */
 386   val = XCHAR_TABLE (table)->contents[charset + 128];
 387   if (CATEGORY_SET_P (val))
 388     category_set = val;
 389   else if (!SUB_CHAR_TABLE_P (val))
 390     {
 391       category_set = val = MAKE_CATEGORY_SET;
 392       XCHAR_TABLE (table)->contents[charset + 128] = category_set;
 393     }
 394
 395   if (c1 <= 0)
 396     {
 397       /* Only a charset is specified.  */
 398       if (SUB_CHAR_TABLE_P (val))
 399         /* All characters in CHARSET should be the same as for having
 400            CATEGORY or not.  */
 401         modify_lower_category_set (val, category, set_value);
 402       else
 403         SET_CATEGORY_SET (category_set, category, set_value);
 404       return Qnil;
 405     }
 406
 407   /* The second level table.  */
 408   if (!SUB_CHAR_TABLE_P (val))
 409     {
 410       val = make_sub_char_table (Qnil);
 411       XCHAR_TABLE (table)->contents[charset + 128] = val;
 412       /* We must set default category set of CHARSET in `defalt' slot.  */
 413       XCHAR_TABLE (val)->defalt = category_set;
 414     }
 415   table = val;
 416
 417   val = XCHAR_TABLE (table)->contents[c1];
 418   if (CATEGORY_SET_P (val))
 419     category_set = val;
 420   else if (!SUB_CHAR_TABLE_P (val))
 421     {
 422       category_set = val = Fcopy_sequence (XCHAR_TABLE (table)->defalt);
 423       XCHAR_TABLE (table)->contents[c1] = category_set;
 424     }
 425
 426   if (c2 <= 0)
 427     {
 428       if (SUB_CHAR_TABLE_P (val))
 429         /* All characters in C1 group of CHARSET should be the same as
 430            for CATEGORY.  */
 431         modify_lower_category_set (val, category, set_value);
 432       else
 433         SET_CATEGORY_SET (category_set, category, set_value);
 434       return Qnil;
 435     }
 436
 437   /* The third (bottom) level table.  */
 438   if (!SUB_CHAR_TABLE_P (val))
 439     {
 440       val = make_sub_char_table (Qnil);
 441       XCHAR_TABLE (table)->contents[c1] = val;
 442       /* We must set default category set of CHARSET and C1 in
 443          `defalt' slot.  */
 444       XCHAR_TABLE (val)->defalt = category_set;
 445     }
 446   table = val;
 447
 448   val = XCHAR_TABLE (table)->contents[c2];
 449   if (CATEGORY_SET_P (val))
 450     category_set = val;
 451   else if (!SUB_CHAR_TABLE_P (val))
 452     {
 453       category_set = Fcopy_sequence (XCHAR_TABLE (table)->defalt);
 454       XCHAR_TABLE (table)->contents[c2] = category_set;
 455     }
 456   else
 457     /* This should never happen.  */
 458     error ("Invalid category table");
 459
 460   SET_CATEGORY_SET (category_set, category, set_value);
 461
 462   return Qnil;
 463 }
 464 \f
 465 /* Dump category table to buffer in human-readable format */
 466
 467 static void
 468 describe_category (value)
 469     Lisp_Object value;
 470 {
 471   Lisp_Object mnemonics;
 472
 473   Findent_to (make_number (16), make_number (1));
 474
 475   if (NILP (value))
 476     {
 477       insert_string ("default\n");
 478       return;
 479     }
 480
 481   if (CHAR_TABLE_P (value))
 482     {
 483       insert_string ("deeper char-table ...\n");
 484       return;
 485     }
 486
 487   if (!CATEGORY_SET_P (value))
 488     {
 489       insert_string ("invalid\n");
 490       return;
 491     }
 492
 493   mnemonics = Fcategory_set_mnemonics (value);
 494   insert_from_string (mnemonics, 0, 0, XSTRING (mnemonics)->size,
 495                       STRING_BYTES (XSTRING (mnemonics)), 0);
 496   insert_string ("\n");
 497   return;
 498 }
 499
 500 static Lisp_Object
 501 describe_category_1 (vector)
 502      Lisp_Object vector;
 503 {
 504   struct buffer *old = current_buffer;
 505   set_buffer_internal (XBUFFER (Vstandard_output));
 506   describe_vector (vector, Qnil, describe_category, 0, Qnil, Qnil,
 507                    (int *)0, 0);
 508   {
 509     int i;
 510     Lisp_Object docs = XCHAR_TABLE (vector)->extras[0];
 511     Lisp_Object elt;
 512
 513     if (!VECTORP (docs) || XVECTOR (docs)->size != 95)
 514       {
 515         insert_string ("Invalid first extra slot in this char table\n");
 516         return Qnil;
 517       }
 518
 519     insert_string ("Meanings of mnemonice characters are:\n");
 520     for (i = 0; i < 95; i++)
 521       {
 522         elt = XVECTOR (docs)->contents[i];
 523         if (NILP (elt))
 524           continue;
 525
 526         insert_char (i + 32);
 527         insert (": ", 2);
 528         insert_from_string (elt, 0, 0, XSTRING (elt)->size,
 529                             STRING_BYTES (XSTRING (elt)), 0);
 530         insert ("\n", 1);
 531       }
 532   }
 533
 534   while (! NILP (XCHAR_TABLE (vector)->parent))
 535     {
 536       vector = XCHAR_TABLE (vector)->parent;
 537       insert_string ("\nThe parent category table is:");
 538       describe_vector (vector, Qnil, describe_category, 0, Qnil, Qnil,
 539                        (int *) 0, 0);
 540     }
 541
 542   call0 (intern ("help-mode"));
 543   set_buffer_internal (old);
 544   return Qnil;
 545 }
 546
 547 DEFUN ("describe-categories", Fdescribe_categories, Sdescribe_categories, 0, 0, "",
 548   "Describe the category specifications in the current category table.\n\
 549 The descriptions are inserted in a buffer, which is then displayed.")
 550   ()
 551 {
 552   internal_with_output_to_temp_buffer
 553      ("*Help*", describe_category_1, current_buffer->category_table);
 554
 555   return Qnil;
 556 }
 557 \f
 558 /* Return 1 if there is a word boundary between two word-constituent
 559    characters C1 and C2 if they appear in this order, else return 0.
 560    Use the macro WORD_BOUNDARY_P instead of calling this function
 561    directly.  */
 562
 563 int
 564 word_boundary_p (c1, c2)
 565      int c1, c2;
 566 {
 567   Lisp_Object category_set1, category_set2;
 568   Lisp_Object tail;
 569   int default_result;
 570
 571   if (CHAR_CHARSET (c1) == CHAR_CHARSET (c2))
 572     {
 573       tail = Vword_separating_categories;
 574       default_result = 0;
 575     }
 576   else
 577     {
 578       tail = Vword_combining_categories;
 579       default_result = 1;
 580     }
 581
 582   category_set1 = CATEGORY_SET (c1);
 583   if (NILP (category_set1))
 584     return default_result;
 585   category_set2 = CATEGORY_SET (c2);
 586   if (NILP (category_set2))
 587     return default_result;
 588
 589   for (; CONSP (tail); tail = XCONS (tail)->cdr)
 590     {
 591       Lisp_Object elt = XCONS(tail)->car;
 592
 593       if (CONSP (elt)
 594           && CATEGORYP (XCONS (elt)->car)
 595           && CATEGORYP (XCONS (elt)->cdr)
 596           && CATEGORY_MEMBER (XFASTINT (XCONS (elt)->car), category_set1)
 597           && CATEGORY_MEMBER (XFASTINT (XCONS (elt)->cdr), category_set2))
 598         return !default_result;
 599     }
 600   return default_result;
 601 }
 602
 603 \f
 604 void
 605 init_category_once ()
 606 {
 607   /* This has to be done here, before we call Fmake_char_table.  */
 608   Qcategory_table = intern ("category-table");
 609   staticpro (&Qcategory_table);
 610
 611   /* Intern this now in case it isn't already done.
 612      Setting this variable twice is harmless.
 613      But don't staticpro it here--that is done in alloc.c.  */
 614   Qchar_table_extra_slots = intern ("char-table-extra-slots");
 615
 616   /* Now we are ready to set up this property, so we can
 617      create category tables.  */
 618   Fput (Qcategory_table, Qchar_table_extra_slots, make_number (2));
 619
 620   Vstandard_category_table = Fmake_char_table (Qcategory_table, Qnil);
 621   /* Set a category set which contains nothing to the default.  */
 622   XCHAR_TABLE (Vstandard_category_table)->defalt = MAKE_CATEGORY_SET;
 623   Fset_char_table_extra_slot (Vstandard_category_table, make_number (0),
 624                               Fmake_vector (make_number (95), Qnil));
 625 }
 626
 627 void
 628 syms_of_category ()
 629 {
 630   Qcategoryp = intern ("categoryp");
 631   staticpro (&Qcategoryp);
 632   Qcategorysetp = intern ("categorysetp");
 633   staticpro (&Qcategorysetp);
 634   Qcategory_table_p = intern ("category-table-p");
 635   staticpro (&Qcategory_table_p);
 636
 637   DEFVAR_LISP ("word-combining-categories", &Vword_combining_categories,
 638     "List of pair (cons) of categories to determine word boundary.\n\
 639 \n\
 640 Emacs treats a sequence of word constituent characters as a single\n\
 641 word (i.e. finds no word boundary between them) iff they belongs to\n\
 642 the same charset.  But, exceptions are allowed in the following cases.\n\
 643 \n\
 644 (1) The case that characters are in different charsets is controlled\n\
 645 by the variable `word-combining-categories'.\n\
 646 \n\
 647 Emacs finds no word boundary between characters of different charsets\n\
 648 if they have categories matching some element of this list.\n\
 649 \n\
 650 More precisely, if an element of this list is a cons of category CAT1\n\
 651 and CAT2, and a multibyte character C1 which has CAT1 is followed by\n\
 652 C2 which has CAT2, there's no word boundary between C1 and C2.\n\
 653 \n\
 654 For instance, to tell that ASCII characters and Latin-1 characters can\n\
 655 form a single word, the element `(?l . ?l)' should be in this list\n\
 656 because both characters have the category `l' (Latin characters).\n\
 657 \n\
 658 (2) The case that character are in the same charset is controlled by\n\
 659 the variable `word-separating-categories'.\n\
 660 \n\
 661 Emacs find a word boundary between characters of the same charset\n\
 662 if they have categories matching some element of this list.\n\
 663 \n\
 664 More precisely, if an element of this list is a cons of category CAT1\n\
 665 and CAT2, and a multibyte character C1 which has CAT1 is followed by\n\
 666 C2 which has CAT2, there's a word boundary between C1 and C2.\n\
 667 \n\
 668 For instance, to tell that there's a word boundary between Japanese\n\
 669 Hiragana and Japanese Kanji (both are in the same charset), the\n\
 670 element `(?H . ?C) should be in this list.");
 671
 672   Vword_combining_categories = Qnil;
 673
 674   DEFVAR_LISP ("word-separating-categories", &Vword_separating_categories,
 675     "List of pair (cons) of categories to determine word boundary.\n\
 676 See the documentation of the variable `word-combining-categories'.");
 677
 678   Vword_separating_categories = Qnil;
 679
 680   defsubr (&Smake_category_set);
 681   defsubr (&Sdefine_category);
 682   defsubr (&Scategory_docstring);
 683   defsubr (&Sget_unused_category);
 684   defsubr (&Scategory_table_p);
 685   defsubr (&Scategory_table);
 686   defsubr (&Sstandard_category_table);
 687   defsubr (&Scopy_category_table);
 688   defsubr (&Sset_category_table);
 689   defsubr (&Schar_category_set);
 690   defsubr (&Scategory_set_mnemonics);
 691   defsubr (&Smodify_category_entry);
 692   defsubr (&Sdescribe_categories);
 693
 694   category_table_version = 0;
 695 }