src/category.h

   1 /* Declarations having to do with Emacs category tables.
   2    Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
   3      2005, 2006, 2007, 2008, 2009, 2010, 2011
   4      National Institute of Advanced Industrial Science and Technology (AIST)
   5      Registration Number H14PRO021
   6    Copyright (C) 2003
   7      National Institute of Advanced Industrial Science and Technology (AIST)
   8      Registration Number H13PRO009
   9
  10 This file is part of GNU Emacs.
  11
  12 GNU Emacs is free software: you can redistribute it and/or modify
  13 it under the terms of the GNU General Public License as published by
  14 the Free Software Foundation, either version 3 of the License, or
  15 (at your option) any later version.
  16
  17 GNU Emacs is distributed in the hope that it will be useful,
  18 but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 GNU General Public License for more details.
  21
  22 You should have received a copy of the GNU General Public License
  23 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  24
  25
  26 /* We introduce here three types of object: category, category set,
  27    and category table.
  28
  29    A category is like syntax but differs in the following points:
  30
  31    o A category is represented by a mnemonic character of the range
  32    ` '(32)..`~'(126) (printable ASCII characters).
  33
  34    o A category is not exclusive, i.e. a character has multiple
  35    categories (category set).  Of course, there's a case that a
  36    category set is empty, i.e. the character has no category.
  37
  38    o In addition to the predefined categories, a user can define new
  39    categories.  Total number of categories is limited to 95.
  40
  41    A category set is a set of categories represented by Lisp
  42    bool-vector of length 128 (only elements of 31th through 126th
  43    are used).
  44
  45    A category table is like syntax-table, represented by a Lisp
  46    char-table.  The contents are category sets or nil.  It has two
  47    extra slots, for a vector of doc string of each category and a
  48    version number.
  49
  50    The first extra slot is a vector of doc strings of categories, the
  51    length is 95.  The Nth element corresponding to the category N+32.
  52
  53    The second extra slot is a version number of the category table.
  54    But, for the moment, we are not using this slot.  */
  55
  56 #define CATEGORYP(x) \
  57   (INTEGERP ((x)) && XFASTINT ((x)) >= 0x20 && XFASTINT ((x)) <= 0x7E)
  58
  59 #define CHECK_CATEGORY(x) \
  60   CHECK_TYPE (CATEGORYP (x), Qcategoryp, x)
  61
  62 #define XCATEGORY_SET XBOOL_VECTOR
  63
  64 #define CATEGORY_SET_P(x) \
  65   (BOOL_VECTOR_P (x) && XBOOL_VECTOR (x)->size == 128)
  66
  67 /* Return a new empty category set.  */
  68 #define MAKE_CATEGORY_SET (Fmake_bool_vector (make_number (128), Qnil))
  69
  70 #define CHECK_CATEGORY_SET(x) \
  71   CHECK_TYPE (CATEGORY_SET_P (x), Qcategorysetp, x)
  72
  73 /* Return 1 if CATEGORY_SET contains CATEGORY, else return 0.
  74    The faster version of `!NILP (Faref (category_set, category))'.  */
  75 #define CATEGORY_MEMBER(category, category_set)                         \
  76   (XCATEGORY_SET (category_set)->data[(category) / 8]                   \
  77    & (1 << ((category) % 8)))
  78
  79 /* Temporary internal variable used in macro CHAR_HAS_CATEGORY.  */
  80 extern Lisp_Object _temp_category_set;
  81
  82 /* Return 1 if category set of CH contains CATEGORY, elt return 0.  */
  83 #define CHAR_HAS_CATEGORY(ch, category) \
  84   (_temp_category_set = CATEGORY_SET (ch),      \
  85    CATEGORY_MEMBER (category, _temp_category_set))
  86
  87 /* The standard category table is stored where it will automatically
  88    be used in all new buffers.  */
  89 #define Vstandard_category_table BVAR (&buffer_defaults, category_table)
  90
  91 /* Return the category set of character C in the current category table.  */
  92 #define CATEGORY_SET(c) char_category_set (c)
  93
  94 /* Return the doc string of CATEGORY in category table TABLE.  */
  95 #define CATEGORY_DOCSTRING(table, category) \
  96   XVECTOR (Fchar_table_extra_slot (table, make_number (0)))->contents[(category) - ' ']
  97
  98 /* Return the version number of category table TABLE.  Not used for
  99    the moment.  */
 100 #define CATEGORY_TABLE_VERSION (table) \
 101   Fchar_table_extra_slot (table, make_number (1))
 102
 103 /* Return 1 if there is a word boundary between two word-constituent
 104    characters C1 and C2 if they appear in this order, else return 0.
 105    There is no word boundary between two word-constituent ASCII and
 106    Latin-1 characters.  */
 107 #define WORD_BOUNDARY_P(c1, c2)                                 \
 108   (!(SINGLE_BYTE_CHAR_P (c1) && SINGLE_BYTE_CHAR_P (c2))        \
 109    && word_boundary_p (c1, c2))
 110
 111 extern int word_boundary_p (int, int);