| 1 | /* Things for GLYPHS and glyph tables. |
| 2 | Copyright (C) 1993, 2001-2014 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 3 of the License, or |
| 9 | (at your option) 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. If not, see <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | /* Access the slots of a display-table, according to their purpose. */ |
| 20 | |
| 21 | #define DISP_TABLE_P(obj) \ |
| 22 | (CHAR_TABLE_P (obj) \ |
| 23 | && EQ (XCHAR_TABLE (obj)->purpose, Qdisplay_table) \ |
| 24 | && CHAR_TABLE_EXTRA_SLOTS (XCHAR_TABLE (obj)) == DISP_TABLE_EXTRA_SLOTS) |
| 25 | |
| 26 | #define DISP_TABLE_EXTRA_SLOTS 6 |
| 27 | #define DISP_TRUNC_GLYPH(dp) ((dp)->extras[0]) |
| 28 | #define DISP_CONTINUE_GLYPH(dp) ((dp)->extras[1]) |
| 29 | #define DISP_ESCAPE_GLYPH(dp) ((dp)->extras[2]) |
| 30 | #define DISP_CTRL_GLYPH(dp) ((dp)->extras[3]) |
| 31 | #define DISP_INVIS_VECTOR(dp) ((dp)->extras[4]) |
| 32 | #define DISP_BORDER_GLYPH(dp) ((dp)->extras[5]) |
| 33 | |
| 34 | extern Lisp_Object disp_char_vector (struct Lisp_Char_Table *, int); |
| 35 | |
| 36 | #define DISP_CHAR_VECTOR(dp, c) \ |
| 37 | (ASCII_CHAR_P(c) \ |
| 38 | ? (NILP ((dp)->ascii) \ |
| 39 | ? (dp)->defalt \ |
| 40 | : (SUB_CHAR_TABLE_P ((dp)->ascii) \ |
| 41 | ? XSUB_CHAR_TABLE ((dp)->ascii)->contents[c] \ |
| 42 | : (dp)->ascii)) \ |
| 43 | : disp_char_vector ((dp), (c))) |
| 44 | |
| 45 | /* Defined in window.c. */ |
| 46 | extern struct Lisp_Char_Table *window_display_table (struct window *); |
| 47 | |
| 48 | /* Defined in indent.c. */ |
| 49 | extern struct Lisp_Char_Table *buffer_display_table (void); |
| 50 | |
| 51 | /* This is the `purpose' slot of a display table. */ |
| 52 | extern Lisp_Object Qdisplay_table; |
| 53 | |
| 54 | /* Return the current length of the GLYPH table, |
| 55 | or 0 if the table isn't currently valid. */ |
| 56 | #define GLYPH_TABLE_LENGTH \ |
| 57 | ((VECTORP (Vglyph_table)) ? ASIZE (Vglyph_table) : 0) |
| 58 | |
| 59 | /* Return the current base (for indexing) of the GLYPH table, |
| 60 | or 0 if the table isn't currently valid. */ |
| 61 | #define GLYPH_TABLE_BASE \ |
| 62 | ((VECTORP (Vglyph_table)) ? XVECTOR (Vglyph_table)->contents : 0) |
| 63 | |
| 64 | /* Given BASE and LEN returned by the two previous macros, |
| 65 | return nonzero if the GLYPH code G should be output as a single |
| 66 | character with code G. Return zero if G has a string in the table. */ |
| 67 | #define GLYPH_SIMPLE_P(base,len,g) \ |
| 68 | (GLYPH_FACE (g) != DEFAULT_FACE_ID || GLYPH_CHAR (g) >= (len) || !STRINGP (base[GLYPH_CHAR (g)])) |
| 69 | |
| 70 | /* Given BASE and LEN returned by the two previous macros, |
| 71 | return nonzero if GLYPH code G is aliased to a different code. */ |
| 72 | #define GLYPH_ALIAS_P(base,len,g) \ |
| 73 | (GLYPH_FACE (g) == DEFAULT_FACE_ID && GLYPH_CHAR (g) < (len) && INTEGERP (base[GLYPH_CHAR (g)])) |
| 74 | |
| 75 | /* Follow all aliases for G in the glyph table given by (BASE, |
| 76 | LENGTH), and set G to the final glyph. */ |
| 77 | #define GLYPH_FOLLOW_ALIASES(base, length, g) \ |
| 78 | do { \ |
| 79 | while (GLYPH_ALIAS_P ((base), (length), (g))) \ |
| 80 | SET_GLYPH_CHAR ((g), XINT ((base)[GLYPH_CHAR (g)])); \ |
| 81 | if (!GLYPH_CHAR_VALID_P (g)) \ |
| 82 | SET_GLYPH_CHAR (g, ' '); \ |
| 83 | } while (false) |
| 84 | |
| 85 | /* Assuming that GLYPH_SIMPLE_P (BASE, LEN, G) is 0, |
| 86 | return the length and the address of the character-sequence |
| 87 | used for outputting GLYPH G. */ |
| 88 | #define GLYPH_LENGTH(base,g) SCHARS (base[GLYPH_CHAR (g)]) |
| 89 | #define GLYPH_STRING(base,g) SDATA (base[GLYPH_CHAR (g)]) |
| 90 | |
| 91 | /* GLYPH for a space character. */ |
| 92 | |
| 93 | #define SPACEGLYPH 040 |
| 94 | #define NULL_GLYPH 00 |
| 95 | |
| 96 | #define SET_GLYPH_FROM_CHAR(glyph, c) \ |
| 97 | SET_GLYPH (glyph, c, DEFAULT_FACE_ID) |