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/* Declarations having to do with GNU Emacs syntax tables.
Copyright (C) 1985, 1993, 1994 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 2, 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
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, 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 chartable whose elements are cons cells
(CODE+FLAGS . MATCHING-CHAR). MATCHING-CHAR can be nil if the char
is not a kind of parenthesis.

The low 8 bits of CODE+FLAGS 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 */
    Sinherit, /* use the standard syntax table for this character */
    Smax /* Upper bound on codes that are meaningful */
  };

/* Fetch the syntax entry for char C from table TABLE.
This returns the whole entry (normally a cons cell)
and does not do any kind of inheritance. */

#if 1
#define RAW_SYNTAX_ENTRY(table, c) \
(XCHAR_TABLE (table)->contents[(unsigned char) (c)])

#define SET_RAW_SYNTAX_ENTRY(table, c, val) \
(XCHAR_TABLE (table)->contents[(unsigned char) (c)] = (val))
#else
#define RAW_SYNTAX_ENTRY(table, c) \
((c) >= 128 \
? raw_syntax_table_lookup (table, c) \
: XCHAR_TABLE (table)->contents[(unsigned char) (c)])

#define SET_RAW_SYNTAX_ENTRY(table, c, val) \
((c) >= 128 \
? set_raw_syntax_table_lookup (table, c, (val)) \
: XCHAR_TABLE (table)->contents[(unsigned char) (c)] = (val))
#endif

/* Extract the information from the entry for character C
in syntax table TABLE. Do inheritance. */

#ifdef __GNUC__
#define SYNTAX_ENTRY(c) \
({ Lisp_Object temp, table; \
unsigned char cc = (c); \
table = current_buffer->syntax_table; \
while (!NILP (table)) \
{ \
temp = RAW_SYNTAX_ENTRY (table, cc); \
if (!NILP (temp)) \
break; \
table = XCHAR_TABLE (table)->parent; \
} \
temp; })

#define SYNTAX(c) \
({ Lisp_Object temp; \
temp = SYNTAX_ENTRY (c); \
(CONSP (temp) \
? (enum syntaxcode) (XINT (XCONS (temp)->car) & 0xff) \
: wrong_type_argument (Qconsp, temp)); })

#define SYNTAX_WITH_FLAGS(c) \
({ Lisp_Object temp; \
temp = SYNTAX_ENTRY (c); \
(CONSP (temp) \
? XINT (XCONS (temp)->car) \
: wrong_type_argument (Qconsp, temp)); })

#define SYNTAX_MATCH(c) \
({ Lisp_Object temp; \
temp = SYNTAX_ENTRY (c); \
(CONSP (temp) \
? XINT (XCONS (temp)->cdr) \
: wrong_type_argument (Qconsp, temp)); })
#else
extern Lisp_Object syntax_temp;
extern Lisp_Object syntax_parent_lookup ();

#define SYNTAX_ENTRY(c) \
(syntax_temp \
= RAW_SYNTAX_ENTRY (current_buffer->syntax_table, (c)), \
(NILP (syntax_temp) \
? (syntax_temp \
= syntax_parent_lookup (current_buffer->syntax_table, \
(unsigned char) (c))) \
: syntax_temp))

#define SYNTAX(c) \
(syntax_temp = SYNTAX_ENTRY ((c)), \
(CONSP (syntax_temp) \
? (enum syntaxcode) (XINT (XCONS (syntax_temp)->car) & 0xff) \
: wrong_type_argument (Qconsp, syntax_temp)))

#define SYNTAX_WITH_FLAGS(c) \
(syntax_temp = SYNTAX_ENTRY ((c)), \
(CONSP (syntax_temp) \
? XINT (XCONS (syntax_temp)->car) \
: wrong_type_argument (Qconsp, syntax_temp)))

#define SYNTAX_MATCH(c) \
(syntax_temp = SYNTAX_ENTRY ((c)), \
(CONSP (syntax_temp) \
? XINT (XCONS (syntax_temp)->cdr) \
: wrong_type_argument (Qconsp, syntax_temp)))
#endif

/* 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.
*/

#define SYNTAX_COMSTART_FIRST(c) ((SYNTAX_WITH_FLAGS (c) >> 16) & 1)

#define SYNTAX_COMSTART_SECOND(c) ((SYNTAX_WITH_FLAGS (c) >> 17) & 1)

#define SYNTAX_COMEND_FIRST(c) ((SYNTAX_WITH_FLAGS (c) >> 18) & 1)

#define SYNTAX_COMEND_SECOND(c) ((SYNTAX_WITH_FLAGS (c) >> 19) & 1)

#define SYNTAX_PREFIX(c) ((SYNTAX_WITH_FLAGS (c) >> 20) & 1)

/* extract the comment style bit from the syntax table entry */
#define SYNTAX_COMMENT_STYLE(c) ((SYNTAX_WITH_FLAGS (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[14];
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