src/disptab.h

   1 /* Things for GLYPHS and glyph tables.
   2    Copyright (C) 1993 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 /* Access the slots of a display-table, according to their purpose.  */
  22
  23 #define DISP_TABLE_P(obj)                                                   \
  24   (CHAR_TABLE_P (obj)                                                       \
  25    && EQ (XCHAR_TABLE (obj)->purpose, Qdisplay_table)                       \
  26    && CHAR_TABLE_EXTRA_SLOTS (XCHAR_TABLE (obj)) == DISP_TABLE_EXTRA_SLOTS)
  27
  28 #define DISP_TABLE_EXTRA_SLOTS 6
  29 #define DISP_TRUNC_GLYPH(dp) ((dp)->extras[0])
  30 #define DISP_CONTINUE_GLYPH(dp) ((dp)->extras[1])
  31 #define DISP_ESCAPE_GLYPH(dp) ((dp)->extras[2])
  32 #define DISP_CTRL_GLYPH(dp) ((dp)->extras[3])
  33 #define DISP_INVIS_VECTOR(dp) ((dp)->extras[4])
  34 #define DISP_BORDER_GLYPH(dp) ((dp)->extras[5])
  35
  36 extern Lisp_Object disp_char_vector P_ ((struct Lisp_Char_Table *, int));
  37
  38 #define DISP_CHAR_VECTOR(dp, c) \
  39   (SINGLE_BYTE_CHAR_P(c) ? (dp)->contents[c] : disp_char_vector ((dp), (c)))
  40
  41 /* Defined in window.c.  */
  42 extern struct Lisp_Char_Table *window_display_table P_ ((struct window *));
  43
  44 /* Defined in indent.c.  */
  45 extern struct Lisp_Char_Table *buffer_display_table P_ ((void));
  46
  47 /* Display table to use for vectors that don't specify their own.  */
  48 extern Lisp_Object Vstandard_display_table;
  49
  50 /* This is the `purpose' slot of a display table.  */
  51 extern Lisp_Object Qdisplay_table;
  52
  53 /* Vector of GLYPH definitions.  Indexed by GLYPH number,
  54    the contents are a string which is how to output the GLYPH.  */
  55 extern Lisp_Object Vglyph_table;
  56
  57 /* Return the current length of the GLYPH table,
  58    or 0 if the table isn't currently valid.  */
  59 #define GLYPH_TABLE_LENGTH  \
  60   ((VECTORP (Vglyph_table)) ? XVECTOR (Vglyph_table)->size : 0)
  61
  62 /* Return the current base (for indexing) of the GLYPH table,
  63    or 0 if the table isn't currently valid.  */
  64 #define GLYPH_TABLE_BASE  \
  65   ((VECTORP (Vglyph_table)) ? XVECTOR (Vglyph_table)->contents : 0)
  66
  67 /* Given BASE and LEN returned by the two previous macros,
  68    return nonzero if the GLYPH code G should be output as a single
  69    character with code G.  Return zero if G has a string in the table.  */
  70 #define GLYPH_SIMPLE_P(base,len,g) ((g) >= (len) || !STRINGP (base[g]))
  71
  72 /* Given BASE and LEN returned by the two previous macros,
  73    return nonzero if GLYPH code G is aliased to a different code.  */
  74 #define GLYPH_ALIAS_P(base,len,g) ((g) < (len) && INTEGERP (base[g]))
  75
  76 /* Assuming that GLYPH_SIMPLE_P (BASE, LEN, G) is 1,
  77    return the alias for G.  */
  78 #define GLYPH_ALIAS(base, g) XINT (base[g])
  79
  80 /* Follow all aliases for G in the glyph table given by (BASE,
  81    LENGTH), and set G to the final glyph.  */
  82 #define GLYPH_FOLLOW_ALIASES(base, length, g)           \
  83   do {                                                  \
  84     while (GLYPH_ALIAS_P ((base), (length), (g)))       \
  85       (g) = GLYPH_ALIAS ((base), (g));                  \
  86     if (!GLYPH_CHAR_VALID_P (FAST_GLYPH_CHAR (g)))      \
  87       g = FAST_MAKE_GLYPH (' ', FAST_GLYPH_FACE (g));   \
  88   } while (0)
  89
  90 /* Assuming that GLYPH_SIMPLE_P (BASE, LEN, G) is 0,
  91    return the length and the address of the character-sequence
  92    used for outputting GLYPH G.  */
  93 #define GLYPH_LENGTH(base,g)   XSTRING (base[g])->size
  94 #define GLYPH_STRING(base,g)   XSTRING (base[g])->data
  95
  96 /* GLYPH for a space character.  */
  97
  98 #define SPACEGLYPH 040
  99 #define NULL_GLYPH 00
 100
 101 #define GLYPH_FROM_CHAR(c) (c)