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/* Declarations having to do with GNU Emacs syntax tables.
Copyright (C) 1985 Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 1, or (at your option)
any later version.
GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
extern Lisp_Object Qsyntax_table_p;
extern Lisp_Object Fsyntax_table_p (), Fsyntax_table (), Fset_syntax_table ();
/* The standard syntax table is stored where it will automatically
be used in all new buffers. */
#define Vstandard_syntax_table buffer_defaults.syntax_table
/* A syntax table is a Lisp vector of length 0400, whose elements are integers.
The low 8 bits of the integer is a code, as follows:
enum syntaxcode
Swhitespace, /* for a whitespace character */
Spunct, /* for random punctuation characters */
Sword, /* for a word constituent */
Ssymbol, /* symbol constituent but not word constituent */
Sopen, /* for a beginning delimiter */
Sclose, /* for an ending delimiter */
Squote, /* for a prefix character like Lisp ' */
Sstring, /* for a string-grouping character like Lisp " */
Smath, /* for delimiters like $ in Tex. */
Sescape, /* for a character that begins a C-style escape */
Scharquote, /* for a character that quotes the following character */
Scomment, /* for a comment-starting character */
Sendcomment, /* for a comment-ending character */
Smax /* Upper bound on codes that are meaningful */
#define SYNTAX(c) \
((enum syntaxcode) (XINT (XVECTOR (current_buffer->syntax_table)->contents[(unsigned char) (c)]) & 0377))
/* The next 8 bits of the number is a character,
the matching delimiter in the case of Sopen or Sclose. */
#define SYNTAX_MATCH(c) \
((XINT (XVECTOR (current_buffer->syntax_table)->contents[(unsigned char) (c)]) >> 8) & 0377)
/* Then there are six single-bit flags that have the following meanings:
1. This character is the first of a two-character comment-start sequence.
2. This character is the second of a two-character comment-start sequence.
3. This character is the first of a two-character comment-end sequence.
4. This character is the second of a two-character comment-end sequence.
5. This character is a prefix, for backward-prefix-chars.
Note that any two-character sequence whose first character has flag 1
and whose second character has flag 2 will be interpreted as a comment start.
bit 6 is used to discriminate between two different comment styles.
Languages such as C++ allow two orthogonal syntax start/end pairs
and bit 6 is used to determine whether a comment-end or Scommentend
ends style a or b. Comment start sequences can start style a or b.
Style a is always the default.
((XINT (XVECTOR (current_buffer->syntax_table)->contents[(unsigned char) (c)]) >> 16) & 1)
((XINT (XVECTOR (current_buffer->syntax_table)->contents[(unsigned char) (c)]) >> 17) & 1)
((XINT (XVECTOR (current_buffer->syntax_table)->contents[(unsigned char) (c)]) >> 18) & 1)
((XINT (XVECTOR (current_buffer->syntax_table)->contents[(unsigned char) (c)]) >> 19) & 1)
#define SYNTAX_PREFIX(c) \
((XINT (XVECTOR (current_buffer->syntax_table)->contents[(unsigned char) (c)]) >> 20) & 1)
/* extract the comment style bit from the syntax table entry */
((XINT (XVECTOR (current_buffer->syntax_table)->contents[c]) >> 21) & 1)
/* This array, indexed by a character, contains the syntax code which that
character signifies (as a char). For example,
(enum syntaxcode) syntax_spec_code['w'] is Sword. */
extern unsigned char syntax_spec_code[0400];
/* Indexed by syntax code, give the letter that describes it. */
extern char syntax_code_spec[13];
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