code.delx.au - gnu-emacs/blob - 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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 /* Access the slots of a display-table, according to their purpose.  */
  21
  22 #define DISP_TABLE_P(obj)                                                   \
  23   (CHAR_TABLE_P (obj)                                                       \
  24    && XCHAR_TABLE (obj)->purpose == Qdisplay_table                          \
  25    && CHAR_TABLE_EXTRA_SLOTS (XCHAR_TABLE (obj)) == DISP_TABLE_EXTRA_SLOTS)
  26
  27 #define DISP_TABLE_EXTRA_SLOTS 6
  28 #define DISP_TRUNC_GLYPH(dp) ((dp)->extras[0])
  29 #define DISP_CONTINUE_GLYPH(dp) ((dp)->extras[1])
  30 #define DISP_ESCAPE_GLYPH(dp) ((dp)->extras[2])
  31 #define DISP_CTRL_GLYPH(dp) ((dp)->extras[3])
  32 #define DISP_INVIS_VECTOR(dp) ((dp)->extras[4])
  33 #define DISP_BORDER_GLYPH(dp) ((dp)->extras[5])
  34
  35 #define DISP_CHAR_VECTOR(dp, c) ((dp)->contents[c])
  36
  37 /* Defined in window.c.  */
  38 extern struct Lisp_Char_Table *window_display_table ();
  39
  40 /* Defined in indent.c.  */
  41 extern struct Lisp_Char_Table *buffer_display_table ();
  42
  43 /* Display table to use for vectors that don't specify their own.  */
  44 extern Lisp_Object Vstandard_display_table;
  45
  46 /* This is the `purpose' slot of a display table.  */
  47 extern Lisp_Object Qdisplay_table;
  48
  49 /* Vector of GLYPH definitions.  Indexed by GLYPH number,
  50    the contents are a string which is how to output the GLYPH.  */
  51 extern Lisp_Object Vglyph_table;
  52
  53 /* Return the current length of the GLYPH table,
  54    or 0 if the table isn't currently valid.  */
  55 #define GLYPH_TABLE_LENGTH  \
  56   ((VECTORP (Vglyph_table)) ? XVECTOR (Vglyph_table)->size : 0)
  57
  58 /* Return the current base (for indexing) of the GLYPH table,
  59    or 0 if the table isn't currently valid.  */
  60 #define GLYPH_TABLE_BASE  \
  61   ((VECTORP (Vglyph_table)) ? XVECTOR (Vglyph_table)->contents : 0)
  62
  63 /* Given BASE and LEN returned by the two previous macros,
  64    return nonzero if the GLYPH code G should be output as a single
  65    character with code G.  Return zero if G has a string in the table.  */
  66 #define GLYPH_SIMPLE_P(base,len,g) ((g) >= (len) || !STRINGP (base[g]))
  67
  68 /* Given BASE and LEN returned by the two previous macros,
  69    return nonzero if GLYPH code G is aliased to a different code.  */
  70 #define GLYPH_ALIAS_P(base,len,g) ((g) < (len) && INTEGERP (base[g]))
  71
  72 /* Assuming that GLYPH_SIMPLE_P (BASE, LEN, G) is 1,
  73    return the alias for G.  */
  74 #define GLYPH_ALIAS(base, g) XINT (base[g])
  75
  76 /* Follow all aliases for G in the glyph table given by (BASE,
  77    LENGTH), and set G to the final glyph.  */
  78 #define GLYPH_FOLLOW_ALIASES(base, length, g)                           \
  79   while (GLYPH_ALIAS_P ((base), (length), (g)))                         \
  80     (g) = GLYPH_ALIAS ((base), (g));
  81
  82 /* Assuming that GLYPH_SIMPLE_P (BASE, LEN, G) is 0,
  83    return the length and the address of the character-sequence
  84    used for outputting GLYPH G.  */
  85 #define GLYPH_LENGTH(base,g)   XSTRING (base[g])->size
  86 #define GLYPH_STRING(base,g)   XSTRING (base[g])->data
  87
  88 /* GLYPH for a space character.  */
  89
  90 #define SPACEGLYPH 040
  91 #define NULL_GLYPH 00
  92
  93 #define GLYPH_FROM_CHAR(c) (c)
  94
  95 extern int glyphlen ();
  96 extern void str_to_glyph_cpy ();
  97 extern void str_to_glyph_ncpy ();
  98 extern void glyph_to_str_cpy ();