| 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) |