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, 2012
   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 (at
  15 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 #ifndef EMACS_CATEGORY_H
  26 #define EMACS_CATEGORY_H
  27
  28 /* We introduce here three types of object: category, category set,
  29    and category table.
  30
  31    A category is like syntax but differs in the following points:
  32
  33    o A category is represented by a mnemonic character of the range
  34    ` '(32)..`~'(126) (printable ASCII characters).
  35
  36    o A category is not exclusive, i.e. a character has multiple
  37    categories (category set).  Of course, there's a case that a
  38    category set is empty, i.e. the character has no category.
  39
  40    o In addition to the predefined categories, a user can define new
  41    categories.  Total number of categories is limited to 95.
  42
  43    A category set is a set of categories represented by Lisp
  44    bool-vector of length 128 (only elements of 31th through 126th
  45    are used).
  46
  47    A category table is like syntax-table, represented by a Lisp
  48    char-table.  The contents are category sets or nil.  It has two
  49    extra slots, for a vector of doc string of each category and a
  50    version number.
  51
  52    The first extra slot is a vector of doc strings of categories, the
  53    length is 95.  The Nth element corresponding to the category N+32.
  54
  55    The second extra slot is a version number of the category table.
  56    But, for the moment, we are not using this slot.  */
  57
  58 #include "lisp.h"
  59
  60 INLINE_HEADER_BEGIN
  61
  62 #define CATEGORYP(x) RANGED_INTEGERP (0x20, x, 0x7E)
  63
  64 #define CHECK_CATEGORY(x) \
  65   CHECK_TYPE (CATEGORYP (x), Qcategoryp, x)
  66
  67 #define CATEGORY_SET_P(x) \
  68   (BOOL_VECTOR_P (x) && bool_vector_size (x) == 128)
  69
  70 /* Return a new empty category set.  */
  71 #define MAKE_CATEGORY_SET (Fmake_bool_vector (make_number (128), Qnil))
  72
  73 #define CHECK_CATEGORY_SET(x) \
  74   CHECK_TYPE (CATEGORY_SET_P (x), Qcategorysetp, x)
  75
  76 /* Return the category set of character C in the current category table.  */
  77 #define CATEGORY_SET(c) char_category_set (c)
  78
  79 /* Return true if CATEGORY_SET contains CATEGORY.
  80    Faster than '!NILP (Faref (category_set, make_number (category)))'.  */
  81 INLINE bool
  82 CATEGORY_MEMBER (EMACS_INT category, Lisp_Object category_set)
  83 {
  84   return bool_vector_bitref (category_set, category);
  85 }
  86
  87 /* Return true if category set of CH contains CATEGORY.  */
  88 INLINE bool
  89 CHAR_HAS_CATEGORY (int ch, int category)
  90 {
  91   Lisp_Object category_set = CATEGORY_SET (ch);
  92   return CATEGORY_MEMBER (category, category_set);
  93 }
  94
  95 /* The standard category table is stored where it will automatically
  96    be used in all new buffers.  */
  97 #define Vstandard_category_table BVAR (&buffer_defaults, category_table)
  98
  99 /* Return the doc string of CATEGORY in category table TABLE.  */
 100 #define CATEGORY_DOCSTRING(table, category)                             \
 101   AREF (Fchar_table_extra_slot (table, make_number (0)), ((category) - ' '))
 102
 103 /* Set the doc string of CATEGORY to VALUE in category table TABLE.  */
 104 #define SET_CATEGORY_DOCSTRING(table, category, value)                  \
 105   ASET (Fchar_table_extra_slot (table, make_number (0)), ((category) - ' '), value)
 106
 107 /* Return the version number of category table TABLE.  Not used for
 108    the moment.  */
 109 #define CATEGORY_TABLE_VERSION (table) \
 110   Fchar_table_extra_slot (table, make_number (1))
 111
 112 /* Return true if there is a word boundary between two
 113    word-constituent characters C1 and C2 if they appear in this order.
 114    There is no word boundary between two word-constituent ASCII and
 115    Latin-1 characters.  */
 116 #define WORD_BOUNDARY_P(c1, c2)                                 \
 117   (!(SINGLE_BYTE_CHAR_P (c1) && SINGLE_BYTE_CHAR_P (c2))        \
 118    && word_boundary_p (c1, c2))
 119
 120 extern bool word_boundary_p (int, int);
 121
 122 INLINE_HEADER_END
 123
 124 #endif /* EMACS_CATEGORY_H */