category.c 16.1 KB
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/* GNU Emacs routines to deal with category tables.
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   Copyright (C) 1998, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
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     Free Software Foundation, Inc.
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   Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
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     2005, 2006, 2007, 2008
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     National Institute of Advanced Industrial Science and Technology (AIST)
     Registration Number H14PRO021
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   Copyright (C) 2003
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     National Institute of Advanced Industrial Science and Technology (AIST)
     Registration Number H13PRO009
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This file is part of GNU Emacs.

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GNU Emacs is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
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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
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along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
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/* Here we handle three objects: category, category set, and category
   table.  Read comments in the file category.h to understand them.  */

#include <config.h>
#include <ctype.h>
#include "lisp.h"
#include "buffer.h"
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#include "character.h"
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#include "charset.h"
#include "category.h"
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#include "keymap.h"
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/* 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;

Lisp_Object Qcategory_table, Qcategoryp, Qcategorysetp, Qcategory_table_p;

/* Variables to determine word boundary.  */
Lisp_Object Vword_combining_categories, Vword_separating_categories;

/* Temporary internal variable used in macro CHAR_HAS_CATEGORY.  */
Lisp_Object _temp_category_set;


/* Category set staff.  */

DEFUN ("make-category-set", Fmake_category_set, Smake_category_set, 1, 1, 0,
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       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.  */)
     (categories)
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     Lisp_Object categories;
{
  Lisp_Object val;
  int len;

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  CHECK_STRING (categories);
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  val = MAKE_CATEGORY_SET;

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  if (STRING_MULTIBYTE (categories))
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    error ("Multibyte string in `make-category-set'");
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  len = SCHARS (categories);
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  while (--len >= 0)
    {
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      Lisp_Object category;
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      XSETFASTINT (category, SREF (categories, len));
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      CHECK_CATEGORY (category);
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      SET_CATEGORY_SET (val, category, Qt);
    }
  return val;
}


/* Category staff.  */

Lisp_Object check_category_table ();

DEFUN ("define-category", Fdefine_category, Sdefine_category, 2, 3, 0,
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       doc: /* Define CATEGORY as a category which is described by DOCSTRING.
CATEGORY should be an ASCII printing character in the range ` ' to `~'.
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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.
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The category is defined only in category table TABLE, which defaults to
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the current buffer's category table.  */)
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     (category, docstring, table)
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     Lisp_Object category, docstring, table;
{
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  CHECK_CATEGORY (category);
  CHECK_STRING (docstring);
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  table = check_category_table (table);

  if (!NILP (CATEGORY_DOCSTRING (table, XFASTINT (category))))
    error ("Category `%c' is already defined", XFASTINT (category));
  CATEGORY_DOCSTRING (table, XFASTINT (category)) = docstring;

  return Qnil;
}

DEFUN ("category-docstring", Fcategory_docstring, Scategory_docstring, 1, 2, 0,
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       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.  */)
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     (category, table)
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     Lisp_Object category, table;
{
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  CHECK_CATEGORY (category);
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  table = check_category_table (table);

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

DEFUN ("get-unused-category", Fget_unused_category, Sget_unused_category,
       0, 1, 0,
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       doc: /* Return a category which is not yet defined in TABLE.
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If no category remains available, return nil.
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The optional argument TABLE specifies which category table to modify;
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it defaults to the current buffer's category table.  */)
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     (table)
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     Lisp_Object table;
{
  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,
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       doc: /* Return t if ARG is a category table.  */)
     (arg)
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     Lisp_Object arg;
{
  if (CHAR_TABLE_P (arg)
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      && EQ (XCHAR_TABLE (arg)->purpose, Qcategory_table))
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    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.  */

Lisp_Object
check_category_table (table)
     Lisp_Object table;
{
  if (NILP (table))
    return current_buffer->category_table;
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  CHECK_TYPE (!NILP (Fcategory_table_p (table)), Qcategory_table_p, table);
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  return table;
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}
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DEFUN ("category-table", Fcategory_table, Scategory_table, 0, 0, 0,
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       doc: /* Return the current category table.
This is the one specified by the current buffer.  */)
     ()
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{
  return current_buffer->category_table;
}

DEFUN ("standard-category-table", Fstandard_category_table,
   Sstandard_category_table, 0, 0, 0,
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       doc: /* Return the standard category table.
This is the one used for new buffers.  */)
     ()
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{
  return Vstandard_category_table;
}

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static void
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copy_category_entry (table, c, val)
     Lisp_Object table, c, val;
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{
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  val = Fcopy_sequence (val);
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  if (CONSP (c))
    char_table_set_range (table, XINT (XCAR (c)), XINT (XCDR (c)), val);
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  else
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    char_table_set (table, XINT (c), val);
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}

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/* Return a copy of category table TABLE.  We can't simply use the
   function copy-sequence because no contents should be shared between
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   the original and the copy.  This function is called recursively by
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   binding TABLE to a sub char table.  */
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Lisp_Object
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copy_category_table (table)
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     Lisp_Object table;
{
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  table = copy_char_table (table);
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  if (! NILP (XCHAR_TABLE (table)->defalt))
    XCHAR_TABLE (table)->defalt
      = Fcopy_sequence (XCHAR_TABLE (table)->defalt);
  XCHAR_TABLE (table)->extras[0]
    = Fcopy_sequence (XCHAR_TABLE (table)->extras[0]);
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  map_char_table (copy_category_entry, Qnil, table, table);
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  return table;
}

DEFUN ("copy-category-table", Fcopy_category_table, Scopy_category_table,
       0, 1, 0,
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       doc: /* Construct a new category table and return it.
It is a copy of the TABLE, which defaults to the standard category table.  */)
     (table)
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     Lisp_Object table;
{
  if (!NILP (table))
    check_category_table (table);
  else
    table = Vstandard_category_table;

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  return copy_category_table (table);
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}

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DEFUN ("make-category-table", Fmake_category_table, Smake_category_table,
       0, 0, 0,
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       doc: /* Construct a new and empty category table and return it.  */)
     ()
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{
  Lisp_Object val;
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  int i;
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  val = Fmake_char_table (Qcategory_table, Qnil);
  XCHAR_TABLE (val)->defalt = MAKE_CATEGORY_SET;
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  for (i = 0; i < (1 << CHARTAB_SIZE_BITS_0); i++)
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    XCHAR_TABLE (val)->contents[i] = MAKE_CATEGORY_SET;
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  Fset_char_table_extra_slot (val, make_number (0),
			      Fmake_vector (make_number (95), Qnil));
  return val;
}

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DEFUN ("set-category-table", Fset_category_table, Sset_category_table, 1, 1, 0,
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       doc: /* Specify TABLE as the category table for the current buffer.
Return TABLE.  */)
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     (table)
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     Lisp_Object table;
{
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  int idx;
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  table = check_category_table (table);
  current_buffer->category_table = table;
  /* Indicate that this buffer now has a specified category table.  */
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  idx = PER_BUFFER_VAR_IDX (category_table);
  SET_PER_BUFFER_VALUE_P (current_buffer, idx, 1);
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  return table;
}


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Lisp_Object
char_category_set (c)
     int c;
{
  return CHAR_TABLE_REF (current_buffer->category_table, c);
}

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DEFUN ("char-category-set", Fchar_category_set, Schar_category_set, 1, 1, 0,
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       doc: /* Return the category set of CHAR.
usage: (char-category-set CHAR)  */)
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     (ch)
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     Lisp_Object ch;
{
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  CHECK_NUMBER (ch);
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  return CATEGORY_SET (XFASTINT (ch));
}

DEFUN ("category-set-mnemonics", Fcategory_set_mnemonics,
       Scategory_set_mnemonics, 1, 1, 0,
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       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
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that are indexes where t occurs in the bool-vector.
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The return value is a string containing those same categories.  */)
     (category_set)
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     Lisp_Object category_set;
{
  int i, j;
  char str[96];

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

  return build_string (str);
}

void
set_category_set (category_set, category, val)
     Lisp_Object category_set, category, val;
{
  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,
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       doc: /* Modify the category set of CHARACTER by adding CATEGORY to it.
The category is changed only for table TABLE, which defaults to
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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.
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If optional fourth argument RESET is non-nil,
then delete CATEGORY from the category set instead of adding it.  */)
     (character, category, table, reset)
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     Lisp_Object character, category, table, reset;
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{
  Lisp_Object set_value;	/* Actual value to be set in category sets.  */
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  Lisp_Object category_set;
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  int start, end;
  int from, to;
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  if (INTEGERP (character))
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    {
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      CHECK_CHARACTER (character);
      start = end = XFASTINT (character);
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    }
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  else
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    {
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      CHECK_CONS (character);
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      CHECK_CHARACTER_CAR (character);
      CHECK_CHARACTER_CDR (character);
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      start = XFASTINT (XCAR (character));
      end = XFASTINT (XCDR (character));
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    }

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  CHECK_CATEGORY (category);
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  table = check_category_table (table);

  if (NILP (CATEGORY_DOCSTRING (table, XFASTINT (category))))
    error ("Undefined category: %c", XFASTINT (category));

  set_value = NILP (reset) ? Qt : Qnil;

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  while (start <= end)
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    {
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      category_set = char_table_ref_and_range (table, start, &from, &to);
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      if (CATEGORY_MEMBER (XFASTINT (category), category_set) != NILP (reset))
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	{
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	  category_set = Fcopy_sequence (category_set);
	  SET_CATEGORY_SET (category_set, category, set_value);
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	  if (to > end)
	    char_table_set_range (table, start, end, category_set);
	  else
	    char_table_set_range (table, start, to, category_set);
	}
      start = to + 1;
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    }

  return Qnil;
}

/* Return 1 if there is a word boundary between two word-constituent
   characters C1 and C2 if they appear in this order, else return 0.
   Use the macro WORD_BOUNDARY_P instead of calling this function
   directly.  */

int
word_boundary_p (c1, c2)
     int c1, c2;
{
  Lisp_Object category_set1, category_set2;
  Lisp_Object tail;
  int default_result;

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  if (EQ (CHAR_TABLE_REF (Vchar_script_table, c1),
	  CHAR_TABLE_REF (Vchar_script_table, c2)))
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    {
      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;

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  for (; CONSP (tail); tail = XCDR (tail))
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    {
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      Lisp_Object elt = XCAR (tail);
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      if (CONSP (elt)
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	  && (NILP (XCAR (elt))
	      || (CATEGORYP (XCAR (elt))
		  && CATEGORY_MEMBER (XFASTINT (XCAR (elt)), category_set1)))
	  && (NILP (XCDR (elt))
	      || (CATEGORYP (XCDR (elt))
		  && CATEGORY_MEMBER (XFASTINT (XCDR (elt)), category_set2))))
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	return !default_result;
    }
  return default_result;
}


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void
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init_category_once ()
{
  /* This has to be done here, before we call Fmake_char_table.  */
  Qcategory_table = intern ("category-table");
  staticpro (&Qcategory_table);

  /* 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.  */
  Qchar_table_extra_slots = intern ("char-table-extra-slots");

  /* 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);
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  /* Set a category set which contains nothing to the default.  */
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  XCHAR_TABLE (Vstandard_category_table)->defalt = MAKE_CATEGORY_SET;
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  Fset_char_table_extra_slot (Vstandard_category_table, make_number (0),
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			      Fmake_vector (make_number (95), Qnil));
}

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void
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syms_of_category ()
{
  Qcategoryp = intern ("categoryp");
  staticpro (&Qcategoryp);
  Qcategorysetp = intern ("categorysetp");
  staticpro (&Qcategorysetp);
  Qcategory_table_p = intern ("category-table-p");
  staticpro (&Qcategory_table_p);

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

Emacs treats a sequence of word constituent characters as a single
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word (i.e. finds no word boundary between them) only if they belong to
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the same script.  But, exceptions are allowed in the following cases.
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\(1) The case that characters are in different scripts is controlled
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by the variable `word-combining-categories'.

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Emacs finds no word boundary between characters of different scripts
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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.

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

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Emacs find a word boundary between characters of the same script
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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 a word boundary between C1 and C2.

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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.  */);
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  Vword_combining_categories = Qnil;

  DEFVAR_LISP ("word-separating-categories", &Vword_separating_categories,
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	       doc: /* List of pair (cons) of categories to determine word boundary.
See the documentation of the variable `word-combining-categories'.  */);
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  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);
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  defsubr (&Smake_category_table);
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  defsubr (&Sset_category_table);
  defsubr (&Schar_category_set);
  defsubr (&Scategory_set_mnemonics);
  defsubr (&Smodify_category_entry);

  category_table_version = 0;
}
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/* arch-tag: 74ebf524-121b-4d9c-bd68-07f8d708b211
   (do not change this comment) */