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 ("make-category-table", Fmake_category_table, Smake_category_table,
 257        0, 0, 0,
 258   "Construct a new and empty category table and return it.")
 259   ()
 260 {
 261   Lisp_Object val;
 262
 263   val = Fmake_char_table (Qcategory_table, Qnil);
 264   XCHAR_TABLE (val)->defalt = MAKE_CATEGORY_SET;
 265   Fset_char_table_extra_slot (val, make_number (0),
 266                               Fmake_vector (make_number (95), Qnil));
 267   return val;
 268 }
 269
 270 DEFUN ("set-category-table", Fset_category_table, Sset_category_table, 1, 1, 0,
 271   "Specify TABLE as the category table for the current buffer.")
 272   (table)
 273      Lisp_Object table;
 274 {
 275   int idx;
 276   table = check_category_table (table);
 277   current_buffer->category_table = table;
 278   /* Indicate that this buffer now has a specified category table.  */
 279   idx = PER_BUFFER_VAR_IDX (category_table);
 280   SET_PER_BUFFER_VALUE_P (current_buffer, idx, 1);
 281   return table;
 282 }
 283
 284 \f
 285 DEFUN ("char-category-set", Fchar_category_set, Schar_category_set, 1, 1, 0,
 286   "Return the category set of CHAR.")
 287   (ch)
 288      Lisp_Object ch;
 289 {
 290   Lisp_Object val;
 291   int charset;
 292   unsigned char c1, c2;
 293
 294   CHECK_NUMBER (ch, 0);
 295   return CATEGORY_SET (XFASTINT (ch));
 296 }
 297
 298 DEFUN ("category-set-mnemonics", Fcategory_set_mnemonics,
 299        Scategory_set_mnemonics, 1, 1, 0,
 300   "Return a string containing mnemonics of the categories in CATEGORY-SET.\n\
 301 CATEGORY-SET is a bool-vector, and the categories \"in\" it are those\n\
 302 that are indexes where t occurs the bool-vector.\n\
 303 The return value is a string containing those same categories.")
 304   (category_set)
 305      Lisp_Object category_set;
 306 {
 307   int i, j;
 308   char str[96];
 309
 310   CHECK_CATEGORY_SET (category_set, 0);
 311
 312   j = 0;
 313   for (i = 32; i < 127; i++)
 314     if (CATEGORY_MEMBER (i, category_set))
 315       str[j++] = i;
 316   str[j] = '\0';
 317
 318   return build_string (str);
 319 }
 320
 321 /* Modify all category sets stored under sub char-table TABLE so that
 322    they contain (SET_VALUE is t) or don't contain (SET_VALUE is nil)
 323    CATEGORY.  */
 324
 325 void
 326 modify_lower_category_set (table, category, set_value)
 327      Lisp_Object table, category, set_value;
 328 {
 329   Lisp_Object val;
 330   int i;
 331
 332   val = XCHAR_TABLE (table)->defalt;
 333   if (!CATEGORY_SET_P (val))
 334     val = MAKE_CATEGORY_SET;
 335   SET_CATEGORY_SET (val, category, set_value);
 336   XCHAR_TABLE (table)->defalt = val;
 337
 338   for (i = 32; i < SUB_CHAR_TABLE_ORDINARY_SLOTS; i++)
 339     {
 340       val = XCHAR_TABLE (table)->contents[i];
 341
 342       if (CATEGORY_SET_P (val))
 343         SET_CATEGORY_SET (val, category, set_value);
 344       else if (SUB_CHAR_TABLE_P (val))
 345         modify_lower_category_set (val, category, set_value);
 346     }
 347 }
 348
 349 void
 350 set_category_set (category_set, category, val)
 351      Lisp_Object category_set, category, val;
 352 {
 353   do {
 354     int idx = XINT (category) / 8;
 355     unsigned char bits = 1 << (XINT (category) % 8);
 356
 357     if (NILP (val))
 358       XCATEGORY_SET (category_set)->data[idx] &= ~bits;
 359     else
 360       XCATEGORY_SET (category_set)->data[idx] |= bits;
 361   } while (0);
 362 }
 363
 364 DEFUN ("modify-category-entry", Fmodify_category_entry,
 365        Smodify_category_entry, 2, 4, 0,
 366   "Modify the category set of CHARACTER by adding CATEGORY to it.\n\
 367 The category is changed only for table TABLE, which defaults to\n\
 368  the current buffer's category table.\n\
 369 If optional fourth argument RESET is non-nil,\n\
 370  then delete CATEGORY from the category set instead of adding it.")
 371   (character, category, table, reset)
 372      Lisp_Object character, category, table, reset;
 373 {
 374   int c, charset, c1, c2;
 375   Lisp_Object set_value;        /* Actual value to be set in category sets.  */
 376   Lisp_Object val, category_set;
 377
 378   CHECK_NUMBER (character, 0);
 379   c = XINT (character);
 380   CHECK_CATEGORY (category, 1);
 381   table = check_category_table (table);
 382
 383   if (NILP (CATEGORY_DOCSTRING (table, XFASTINT (category))))
 384     error ("Undefined category: %c", XFASTINT (category));
 385
 386   set_value = NILP (reset) ? Qt : Qnil;
 387
 388   if (c < CHAR_TABLE_SINGLE_BYTE_SLOTS)
 389     {
 390       val = XCHAR_TABLE (table)->contents[c];
 391       if (!CATEGORY_SET_P (val))
 392         XCHAR_TABLE (table)->contents[c] = (val = MAKE_CATEGORY_SET);
 393       SET_CATEGORY_SET (val, category, set_value);
 394       return Qnil;
 395     }
 396
 397   SPLIT_CHAR (c, charset, c1, c2);
 398
 399   /* The top level table.  */
 400   val = XCHAR_TABLE (table)->contents[charset + 128];
 401   if (CATEGORY_SET_P (val))
 402     category_set = val;
 403   else if (!SUB_CHAR_TABLE_P (val))
 404     {
 405       category_set = val = MAKE_CATEGORY_SET;
 406       XCHAR_TABLE (table)->contents[charset + 128] = category_set;
 407     }
 408
 409   if (c1 <= 0)
 410     {
 411       /* Only a charset is specified.  */
 412       if (SUB_CHAR_TABLE_P (val))
 413         /* All characters in CHARSET should be the same as for having
 414            CATEGORY or not.  */
 415         modify_lower_category_set (val, category, set_value);
 416       else
 417         SET_CATEGORY_SET (category_set, category, set_value);
 418       return Qnil;
 419     }
 420
 421   /* The second level table.  */
 422   if (!SUB_CHAR_TABLE_P (val))
 423     {
 424       val = make_sub_char_table (Qnil);
 425       XCHAR_TABLE (table)->contents[charset + 128] = val;
 426       /* We must set default category set of CHARSET in `defalt' slot.  */
 427       XCHAR_TABLE (val)->defalt = category_set;
 428     }
 429   table = val;
 430
 431   val = XCHAR_TABLE (table)->contents[c1];
 432   if (CATEGORY_SET_P (val))
 433     category_set = val;
 434   else if (!SUB_CHAR_TABLE_P (val))
 435     {
 436       category_set = val = Fcopy_sequence (XCHAR_TABLE (table)->defalt);
 437       XCHAR_TABLE (table)->contents[c1] = category_set;
 438     }
 439
 440   if (c2 <= 0)
 441     {
 442       if (SUB_CHAR_TABLE_P (val))
 443         /* All characters in C1 group of CHARSET should be the same as
 444            for CATEGORY.  */
 445         modify_lower_category_set (val, category, set_value);
 446       else
 447         SET_CATEGORY_SET (category_set, category, set_value);
 448       return Qnil;
 449     }
 450
 451   /* The third (bottom) level table.  */
 452   if (!SUB_CHAR_TABLE_P (val))
 453     {
 454       val = make_sub_char_table (Qnil);
 455       XCHAR_TABLE (table)->contents[c1] = val;
 456       /* We must set default category set of CHARSET and C1 in
 457          `defalt' slot.  */
 458       XCHAR_TABLE (val)->defalt = category_set;
 459     }
 460   table = val;
 461
 462   val = XCHAR_TABLE (table)->contents[c2];
 463   if (CATEGORY_SET_P (val))
 464     category_set = val;
 465   else if (!SUB_CHAR_TABLE_P (val))
 466     {
 467       category_set = Fcopy_sequence (XCHAR_TABLE (table)->defalt);
 468       XCHAR_TABLE (table)->contents[c2] = category_set;
 469     }
 470   else
 471     /* This should never happen.  */
 472     error ("Invalid category table");
 473
 474   SET_CATEGORY_SET (category_set, category, set_value);
 475
 476   return Qnil;
 477 }
 478 \f
 479 /* Dump category table to buffer in human-readable format */
 480
 481 static void
 482 describe_category (value)
 483     Lisp_Object value;
 484 {
 485   Lisp_Object mnemonics;
 486
 487   Findent_to (make_number (16), make_number (1));
 488
 489   if (NILP (value))
 490     {
 491       insert_string ("default\n");
 492       return;
 493     }
 494
 495   if (CHAR_TABLE_P (value))
 496     {
 497       insert_string ("deeper char-table ...\n");
 498       return;
 499     }
 500
 501   if (!CATEGORY_SET_P (value))
 502     {
 503       insert_string ("invalid\n");
 504       return;
 505     }
 506
 507   mnemonics = Fcategory_set_mnemonics (value);
 508   insert_from_string (mnemonics, 0, 0, XSTRING (mnemonics)->size,
 509                       STRING_BYTES (XSTRING (mnemonics)), 0);
 510   insert_string ("\n");
 511   return;
 512 }
 513
 514 static Lisp_Object
 515 describe_category_1 (vector)
 516      Lisp_Object vector;
 517 {
 518   struct buffer *old = current_buffer;
 519   set_buffer_internal (XBUFFER (Vstandard_output));
 520   describe_vector (vector, Qnil, describe_category, 0, Qnil, Qnil,
 521                    (int *)0, 0);
 522   {
 523     int i;
 524     Lisp_Object docs = XCHAR_TABLE (vector)->extras[0];
 525     Lisp_Object elt;
 526
 527     if (!VECTORP (docs) || XVECTOR (docs)->size != 95)
 528       {
 529         insert_string ("Invalid first extra slot in this char table\n");
 530         return Qnil;
 531       }
 532
 533     insert_string ("Meanings of mnemonice characters are:\n");
 534     for (i = 0; i < 95; i++)
 535       {
 536         elt = XVECTOR (docs)->contents[i];
 537         if (NILP (elt))
 538           continue;
 539
 540         insert_char (i + 32);
 541         insert (": ", 2);
 542         insert_from_string (elt, 0, 0, XSTRING (elt)->size,
 543                             STRING_BYTES (XSTRING (elt)), 0);
 544         insert ("\n", 1);
 545       }
 546   }
 547
 548   while (! NILP (XCHAR_TABLE (vector)->parent))
 549     {
 550       vector = XCHAR_TABLE (vector)->parent;
 551       insert_string ("\nThe parent category table is:");
 552       describe_vector (vector, Qnil, describe_category, 0, Qnil, Qnil,
 553                        (int *) 0, 0);
 554     }
 555
 556   call0 (intern ("help-mode"));
 557   set_buffer_internal (old);
 558   return Qnil;
 559 }
 560
 561 DEFUN ("describe-categories", Fdescribe_categories, Sdescribe_categories, 0, 0, "",
 562   "Describe the category specifications in the current category table.\n\
 563 The descriptions are inserted in a buffer, which is then displayed.")
 564   ()
 565 {
 566   internal_with_output_to_temp_buffer
 567      ("*Help*", describe_category_1, current_buffer->category_table);
 568
 569   return Qnil;
 570 }
 571 \f
 572 /* Return 1 if there is a word boundary between two word-constituent
 573    characters C1 and C2 if they appear in this order, else return 0.
 574    Use the macro WORD_BOUNDARY_P instead of calling this function
 575    directly.  */
 576
 577 int
 578 word_boundary_p (c1, c2)
 579      int c1, c2;
 580 {
 581   Lisp_Object category_set1, category_set2;
 582   Lisp_Object tail;
 583   int default_result;
 584
 585   if (CHAR_CHARSET (c1) == CHAR_CHARSET (c2))
 586     {
 587       tail = Vword_separating_categories;
 588       default_result = 0;
 589     }
 590   else
 591     {
 592       tail = Vword_combining_categories;
 593       default_result = 1;
 594     }
 595
 596   category_set1 = CATEGORY_SET (c1);
 597   if (NILP (category_set1))
 598     return default_result;
 599   category_set2 = CATEGORY_SET (c2);
 600   if (NILP (category_set2))
 601     return default_result;
 602
 603   for (; CONSP (tail); tail = XCDR (tail))
 604     {
 605       Lisp_Object elt = XCAR (tail);
 606
 607       if (CONSP (elt)
 608           && CATEGORYP (XCAR (elt))
 609           && CATEGORYP (XCDR (elt))
 610           && CATEGORY_MEMBER (XFASTINT (XCAR (elt)), category_set1)
 611           && CATEGORY_MEMBER (XFASTINT (XCDR (elt)), category_set2))
 612         return !default_result;
 613     }
 614   return default_result;
 615 }
 616
 617 \f
 618 void
 619 init_category_once ()
 620 {
 621   /* This has to be done here, before we call Fmake_char_table.  */
 622   Qcategory_table = intern ("category-table");
 623   staticpro (&Qcategory_table);
 624
 625   /* Intern this now in case it isn't already done.
 626      Setting this variable twice is harmless.
 627      But don't staticpro it here--that is done in alloc.c.  */
 628   Qchar_table_extra_slots = intern ("char-table-extra-slots");
 629
 630   /* Now we are ready to set up this property, so we can
 631      create category tables.  */
 632   Fput (Qcategory_table, Qchar_table_extra_slots, make_number (2));
 633
 634   Vstandard_category_table = Fmake_char_table (Qcategory_table, Qnil);
 635   /* Set a category set which contains nothing to the default.  */
 636   XCHAR_TABLE (Vstandard_category_table)->defalt = MAKE_CATEGORY_SET;
 637   Fset_char_table_extra_slot (Vstandard_category_table, make_number (0),
 638                               Fmake_vector (make_number (95), Qnil));
 639 }
 640
 641 void
 642 syms_of_category ()
 643 {
 644   Qcategoryp = intern ("categoryp");
 645   staticpro (&Qcategoryp);
 646   Qcategorysetp = intern ("categorysetp");
 647   staticpro (&Qcategorysetp);
 648   Qcategory_table_p = intern ("category-table-p");
 649   staticpro (&Qcategory_table_p);
 650
 651   DEFVAR_LISP ("word-combining-categories", &Vword_combining_categories,
 652     "List of pair (cons) of categories to determine word boundary.\n\
 653 \n\
 654 Emacs treats a sequence of word constituent characters as a single\n\
 655 word (i.e. finds no word boundary between them) iff they belongs to\n\
 656 the same charset.  But, exceptions are allowed in the following cases.\n\
 657 \n\
 658 \(1) The case that characters are in different charsets is controlled\n\
 659 by the variable `word-combining-categories'.\n\
 660 \n\
 661 Emacs finds no word boundary between characters of different charsets\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 no word boundary between C1 and C2.\n\
 667 \n\
 668 For instance, to tell that ASCII characters and Latin-1 characters can\n\
 669 form a single word, the element `(?l . ?l)' should be in this list\n\
 670 because both characters have the category `l' (Latin characters).\n\
 671 \n\
 672 \(2) The case that character are in the same charset is controlled by\n\
 673 the variable `word-separating-categories'.\n\
 674 \n\
 675 Emacs find a word boundary between characters of the same charset\n\
 676 if they have categories matching some element of this list.\n\
 677 \n\
 678 More precisely, if an element of this list is a cons of category CAT1\n\
 679 and CAT2, and a multibyte character C1 which has CAT1 is followed by\n\
 680 C2 which has CAT2, there's a word boundary between C1 and C2.\n\
 681 \n\
 682 For instance, to tell that there's a word boundary between Japanese\n\
 683 Hiragana and Japanese Kanji (both are in the same charset), the\n\
 684 element `(?H . ?C) should be in this list.");
 685
 686   Vword_combining_categories = Qnil;
 687
 688   DEFVAR_LISP ("word-separating-categories", &Vword_separating_categories,
 689     "List of pair (cons) of categories to determine word boundary.\n\
 690 See the documentation of the variable `word-combining-categories'.");
 691
 692   Vword_separating_categories = Qnil;
 693
 694   defsubr (&Smake_category_set);
 695   defsubr (&Sdefine_category);
 696   defsubr (&Scategory_docstring);
 697   defsubr (&Sget_unused_category);
 698   defsubr (&Scategory_table_p);
 699   defsubr (&Scategory_table);
 700   defsubr (&Sstandard_category_table);
 701   defsubr (&Scopy_category_table);
 702   defsubr (&Smake_category_table);
 703   defsubr (&Sset_category_table);
 704   defsubr (&Schar_category_set);
 705   defsubr (&Scategory_set_mnemonics);
 706   defsubr (&Smodify_category_entry);
 707   defsubr (&Sdescribe_categories);
 708
 709   category_table_version = 0;
 710 }