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1 | /* Declarations having to do with GNU Emacs syntax tables. |
2 | Copyright (C) 1985 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 1, 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 | ||
21 | extern Lisp_Object Qsyntax_table_p; | |
22 | extern Lisp_Object Fsyntax_table_p (), Fsyntax_table (), Fset_syntax_table (); | |
23 | ||
24 | /* The standard syntax table is stored where it will automatically | |
25 | be used in all new buffers. */ | |
26 | #define Vstandard_syntax_table buffer_defaults.syntax_table | |
27 | ||
28 | /* A syntax table is a Lisp vector of length 0400, whose elements are integers. | |
29 | ||
30 | The low 8 bits of the integer is a code, as follows: | |
31 | */ | |
32 | ||
33 | enum syntaxcode | |
34 | { | |
35 | Swhitespace, /* for a whitespace character */ | |
36 | Spunct, /* for random punctuation characters */ | |
37 | Sword, /* for a word constituent */ | |
38 | Ssymbol, /* symbol constituent but not word constituent */ | |
39 | Sopen, /* for a beginning delimiter */ | |
40 | Sclose, /* for an ending delimiter */ | |
41 | Squote, /* for a prefix character like Lisp ' */ | |
42 | Sstring, /* for a string-grouping character like Lisp " */ | |
43 | Smath, /* for delimiters like $ in Tex. */ | |
44 | Sescape, /* for a character that begins a C-style escape */ | |
45 | Scharquote, /* for a character that quotes the following character */ | |
46 | Scomment, /* for a comment-starting character */ | |
47 | Sendcomment, /* for a comment-ending character */ | |
48 | Smax /* Upper bound on codes that are meaningful */ | |
49 | }; | |
50 | ||
51 | #define SYNTAX(c) \ | |
52 | ((enum syntaxcode) (XINT (XVECTOR (current_buffer->syntax_table)->contents[c]) & 0377)) | |
53 | ||
54 | /* The next 8 bits of the number is a character, | |
55 | the matching delimiter in the case of Sopen or Sclose. */ | |
56 | ||
57 | #define SYNTAX_MATCH(c) \ | |
58 | ((XINT (XVECTOR (current_buffer->syntax_table)->contents[c]) >> 8) & 0377) | |
59 | ||
60 | /* Then there are five single-bit flags that have the following meanings: | |
61 | 1. This character is the first of a two-character comment-start sequence. | |
62 | 2. This character is the second of a two-character comment-start sequence. | |
63 | 3. This character is the first of a two-character comment-end sequence. | |
64 | 4. This character is the second of a two-character comment-end sequence. | |
65 | 5. This character is a prefix, for backward-prefix-chars. | |
66 | Note that any two-character sequence whose first character has flag 1 | |
67 | and whose second character has flag 2 will be interpreted as a comment start. */ | |
68 | ||
69 | #define SYNTAX_COMSTART_FIRST(c) \ | |
70 | ((XINT (XVECTOR (current_buffer->syntax_table)->contents[c]) >> 16) & 1) | |
71 | ||
72 | #define SYNTAX_COMSTART_SECOND(c) \ | |
73 | ((XINT (XVECTOR (current_buffer->syntax_table)->contents[c]) >> 17) & 1) | |
74 | ||
75 | #define SYNTAX_COMEND_FIRST(c) \ | |
76 | ((XINT (XVECTOR (current_buffer->syntax_table)->contents[c]) >> 18) & 1) | |
77 | ||
78 | #define SYNTAX_COMEND_SECOND(c) \ | |
79 | ((XINT (XVECTOR (current_buffer->syntax_table)->contents[c]) >> 19) & 1) | |
80 | ||
81 | #define SYNTAX_PREFIX(c) \ | |
82 | ((XINT (XVECTOR (current_buffer->syntax_table)->contents[c]) >> 20) & 1) | |
83 | ||
84 | /* This array, indexed by a character, contains the syntax code which that | |
85 | character signifies (as a char). For example, | |
86 | (enum syntaxcode) syntax_spec_code['w'] is Sword. */ | |
87 | ||
88 | extern unsigned char syntax_spec_code[0400]; | |
89 | ||
90 | /* Indexed by syntax code, give the letter that describes it. */ | |
91 | ||
92 | extern char syntax_code_spec[13]; |