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
   4      National Institute of Advanced Industrial Science and Technology (AIST)
   5      Registration Number H14PRO021
   6
   7 This file is part of GNU Emacs.
   8
   9 GNU Emacs is free software; you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation; either version 2, or (at your option)
  12 any later version.
  13
  14 GNU Emacs is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with GNU Emacs; see the file COPYING.  If not, write to
  21 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  22 Boston, MA 02110-1301, USA.  */
  23
  24
  25 /* We introduce here three types of object: category, category set,
  26    and category table.
  27
  28    A category is like syntax but differs in the following points:
  29
  30    o A category is represented by a mnemonic character of the range
  31    ` '(32)..`~'(126) (printable ASCII characters).
  32
  33    o A category is not exclusive, i.e. a character has multiple
  34    categories (category set).  Of course, there's a case that a
  35    category set is empty, i.e. the character has no category.
  36
  37    o In addition to the predefined categories, a user can define new
  38    categories.  Total number of categories is limited to 95.
  39
  40    A category set is a set of categories represented by Lisp
  41    bool-vector of length 128 (only elements of 31th through 126th
  42    are used).
  43
  44    A category table is like syntax-table, represented by a Lisp
  45    char-table.  The contents are category sets or nil.  It has two
  46    extra slots, for a vector of doc string of each category and a
  47    version number.
  48
  49    The first extra slot is a vector of doc strings of categories, the
  50    length is 95.  The Nth element corresponding to the category N+32.
  51
  52    The second extra slot is a version number of the category table.
  53    But, for the moment, we are not using this slot.  */
  54
  55 #define CATEGORYP(x) \
  56   (INTEGERP ((x)) && XFASTINT ((x)) >= 0x20 && XFASTINT ((x)) <= 0x7E)
  57
  58 #define CHECK_CATEGORY(x) \
  59   CHECK_TYPE (CATEGORYP (x), Qcategoryp, x)
  60
  61 #define XCATEGORY_SET XBOOL_VECTOR
  62
  63 #define CATEGORY_SET_P(x) \
  64   (BOOL_VECTOR_P ((x)) && (EMACS_INT) (XBOOL_VECTOR ((x))->size) == 128)
  65
  66 /* Return a new empty category set.  */
  67 #define MAKE_CATEGORY_SET (Fmake_bool_vector (make_number (128), Qnil))
  68
  69 /* Make CATEGORY_SET includes (if VAL is t) or excludes (if VAL is
  70    nil) CATEGORY.  */
  71 #define SET_CATEGORY_SET(category_set, category, val) \
  72   (Faset (category_set, category, val))
  73
  74 #define CHECK_CATEGORY_SET(x) \
  75   CHECK_TYPE (CATEGORY_SET_P (x), Qcategorysetp, x)
  76
  77 /* Return 1 if CATEGORY_SET contains CATEGORY, else return 0.
  78    The faster version of `!NILP (Faref (category_set, category))'.  */
  79 #define CATEGORY_MEMBER(category, category_set)                         \
  80   (XCATEGORY_SET (category_set)->data[(category) / 8]                   \
  81    & (1 << ((category) % 8)))
  82
  83 /* Temporary internal variable used in macro CHAR_HAS_CATEGORY.  */
  84 extern Lisp_Object _temp_category_set;
  85
  86 /* Return 1 if category set of CH contains CATEGORY, elt return 0.  */
  87 #define CHAR_HAS_CATEGORY(ch, category) \
  88   (_temp_category_set = CATEGORY_SET (ch),      \
  89    CATEGORY_MEMBER (category, _temp_category_set))
  90
  91 /* The standard category table is stored where it will automatically
  92    be used in all new buffers.  */
  93 #define Vstandard_category_table buffer_defaults.category_table
  94
  95 /* Return the category set of character C in the current category table.  */
  96 #ifdef __GNUC__
  97 #define CATEGORY_SET(c)                                                      \
  98   ({ Lisp_Object table = current_buffer->category_table;                     \
  99      Lisp_Object temp;                                                       \
 100      if ((c) < CHAR_TABLE_SINGLE_BYTE_SLOTS)                                 \
 101        while (NILP (temp = XCHAR_TABLE (table)->contents[(unsigned char) c]) \
 102               && NILP (temp = XCHAR_TABLE (table)->defalt))                  \
 103          table = XCHAR_TABLE (table)->parent;                                \
 104      else                                                                    \
 105        temp = Faref (table, make_number (c));                                \
 106      temp; })
 107 #else
 108 #define CATEGORY_SET(c) \
 109   Faref (current_buffer->category_table, make_number (c))
 110 #endif
 111
 112 /* Return the doc string of CATEGORY in category table TABLE.  */
 113 #define CATEGORY_DOCSTRING(table, category) \
 114   XVECTOR (Fchar_table_extra_slot (table, make_number (0)))->contents[(category) - ' ']
 115
 116 /* Return the version number of category table TABLE.  Not used for
 117    the moment.  */
 118 #define CATEGORY_TABLE_VERSION (table) \
 119   Fchar_table_extra_slot (table, make_number (1))
 120
 121 /* Return 1 if there is a word boundary between two word-constituent
 122    characters C1 and C2 if they appear in this order, else return 0.
 123    There is no word boundary between two word-constituent ASCII
 124    characters.  */
 125 #define WORD_BOUNDARY_P(c1, c2)                                 \
 126   (!(SINGLE_BYTE_CHAR_P (c1) && SINGLE_BYTE_CHAR_P (c2))        \
 127    && word_boundary_p (c1, c2))
 128
 129 extern int word_boundary_p P_ ((int, int));
 130
 131 /* arch-tag: 309dfe83-c3e2-4d22-8e81-faae5aece0ff
 132    (do not change this comment) */