XEmacs / src / syntax.h

/* Declarations having to do with XEmacs syntax tables.
   Copyright (C) 1985, 1992, 1993 Free Software Foundation, Inc.

This file is part of XEmacs.

XEmacs 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.

XEmacs 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 XEmacs; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

/* Synched up with: FSF 19.28. */

#ifndef _XEMACS_SYNTAX_H_
#define _XEMACS_SYNTAX_H_

#include "chartab.h"

/* A syntax table is a type of char table.

The low 7 bits of the integer is a code, as follows. The 8th bit is
used as the prefix bit flag (see below).

The values in a syntax table are either integers or conses of
integers and chars.  The lowest 7 bits of the integer are the syntax
class.  If this is Sinherit, then the actual syntax value needs to
be retrieved from the standard syntax table.

Since the logic involved in finding the actual integer isn't very
complex, you'd think the time required to retrieve it is not a
factor.  If you thought that, however, you'd be wrong, due to the
high number of times (many per character) that the syntax value is
accessed in functions such as scan_lists().  To speed this up,
we maintain a mirror syntax table that contains the actual
integers.  We can do this successfully because syntax tables are
now an abstract type, where we control all access.
*/

enum syntaxcode
{
  Swhitespace,	/* whitespace character */
  Spunct,	/* random punctuation character */
  Sword,	/* word constituent */
  Ssymbol,	/* symbol constituent but not word constituent */
  Sopen,	/* a beginning delimiter */
  Sclose,	/* an ending delimiter */
  Squote,	/* a prefix character like Lisp ' */
  Sstring,	/* a string-grouping character like Lisp " */
  Smath,	/* delimiters like $ in TeX. */
  Sescape,	/* a character that begins a C-style escape */
  Scharquote,	/* a character that quotes the following character */
  Scomment,	/* a comment-starting character */
  Sendcomment,	/* a comment-ending character */
  Sinherit,	/* use the standard syntax table for this character */
  Smax	 /* Upper bound on codes that are meaningful */
};

enum syntaxcode charset_syntax (struct buffer *buf, Lisp_Object charset,
				int *multi_p_out);

/* Return the syntax code for a particular character and mirror table. */

#define SYNTAX_CODE_UNSAFE(table, c) \
   XINT (CHAR_TABLE_VALUE_UNSAFE (table, c))

INLINE int SYNTAX_CODE (struct Lisp_Char_Table *table, Emchar c);
INLINE int
SYNTAX_CODE (struct Lisp_Char_Table *table, Emchar c)
{
  return SYNTAX_CODE_UNSAFE (table, c);
}

#define SYNTAX_UNSAFE(table, c) \
  ((enum syntaxcode) (SYNTAX_CODE_UNSAFE (table, c) & 0177))

#define SYNTAX_FROM_CODE(code) ((enum syntaxcode) ((code) & 0177))
#define SYNTAX(table, c) SYNTAX_FROM_CODE (SYNTAX_CODE (table, c))

INLINE int WORD_SYNTAX_P (struct Lisp_Char_Table *table, Emchar c);
INLINE int
WORD_SYNTAX_P (struct Lisp_Char_Table *table, Emchar c)
{
  return SYNTAX (table, c) == Sword;
}

/* OK, here's a graphic diagram of the format of the syntax values:

   Bit number:

 [ 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 ]
 [ 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 ]

   <-----> <-----> <-------------> <-------------> ^  <----------->
    ELisp  unused  |comment bits |     unused      |   syntax code
     tag           | | | | | | | |                 |
    stuff          | | | | | | | |                 |
                   | | | | | | | |                 |
                   | | | | | | | |                 `--> prefix flag
                   | | | | | | | |
                   | | | | | | | `--> comment end style B, second char
                   | | | | | | `----> comment end style A, second char
                   | | | | | `------> comment end style B, first char
                   | | | | `--------> comment end style A, first char
                   | | | `----------> comment start style B, second char
                   | | `------------> comment start style A, second char
                   | `--------------> comment start style B, first char
                   `----------------> comment start style A, first char

  In a 64-bit integer, there would be 32 more unused bits between
  the tag and the comment bits.

  Clearly, such a scheme will not work for Mule, because the matching
  paren could be any character and as such requires 19 bits, which
  we don't got.

  Remember that under Mule we use char tables instead of vectors.
  So what we do is use another char table for the matching paren
  and store a pointer to it in the first char table. (This frees
  code from having to worry about passing two tables around.)
*/


/* The prefix flag bit for backward-prefix-chars is now put into bit 7. */

#define SYNTAX_PREFIX_UNSAFE(table, c) \
  ((SYNTAX_CODE_UNSAFE (table, c) >> 7) & 1)
#define SYNTAX_PREFIX(table, c) \
  ((SYNTAX_CODE (table, c) >> 7) & 1)

/* Bits 23-16 are used to implement up to two comment styles
   in a single buffer. They have the following meanings:

  1. first of a one or two character comment-start sequence of style a.
  2. first of a one or two character comment-start sequence of style b.
  3. second of a two-character comment-start sequence of style a.
  4. second of a two-character comment-start sequence of style b.
  5. first of a one or two character comment-end sequence of style a.
  6. first of a one or two character comment-end sequence of style b.
  7. second of a two-character comment-end sequence of style a.
  8. second of a two-character comment-end sequence of style b.
 */

#define SYNTAX_COMMENT_BITS(table, c) \
  ((SYNTAX_CODE (table, c) >> 16) &0xff)

#define SYNTAX_FIRST_OF_START_A  0x80
#define SYNTAX_FIRST_OF_START_B  0x40
#define SYNTAX_SECOND_OF_START_A 0x20
#define SYNTAX_SECOND_OF_START_B 0x10
#define SYNTAX_FIRST_OF_END_A    0x08
#define SYNTAX_FIRST_OF_END_B    0x04
#define SYNTAX_SECOND_OF_END_A   0x02
#define SYNTAX_SECOND_OF_END_B   0x01

#define SYNTAX_COMMENT_STYLE_A   0xaa
#define SYNTAX_COMMENT_STYLE_B   0x55
#define SYNTAX_FIRST_CHAR_START  0xc0
#define SYNTAX_FIRST_CHAR_END    0x0c
#define SYNTAX_FIRST_CHAR        0xcc
#define SYNTAX_SECOND_CHAR_START 0x30
#define SYNTAX_SECOND_CHAR_END   0x03
#define SYNTAX_SECOND_CHAR       0x33

#define SYNTAX_START_P(table, a, b)					\
  ((SYNTAX_COMMENT_BITS (table, a) & SYNTAX_FIRST_CHAR_START)		\
   && (SYNTAX_COMMENT_BITS (table, b) & SYNTAX_SECOND_CHAR_START))

#define SYNTAX_END_P(table, a, b)					\
  ((SYNTAX_COMMENT_BITS (table, a) & SYNTAX_FIRST_CHAR_END)		\
   && (SYNTAX_COMMENT_BITS (table, b) & SYNTAX_SECOND_CHAR_END))

#define SYNTAX_STYLES_MATCH_START_P(table, a, b, mask)			    \
  ((SYNTAX_COMMENT_BITS (table, a) & SYNTAX_FIRST_CHAR_START & (mask))	    \
   && (SYNTAX_COMMENT_BITS (table, b) & SYNTAX_SECOND_CHAR_START & (mask)))

#define SYNTAX_STYLES_MATCH_END_P(table, a, b, mask)			  \
  ((SYNTAX_COMMENT_BITS (table, a) & SYNTAX_FIRST_CHAR_END & (mask))	  \
   && (SYNTAX_COMMENT_BITS (table, b) & SYNTAX_SECOND_CHAR_END & (mask)))

#define SYNTAX_STYLES_MATCH_1CHAR_P(table, a, mask)	\
  ((SYNTAX_COMMENT_BITS (table, a) & (mask)))

#define STYLE_FOUND_P(table, a, b, startp, style)	\
  ((SYNTAX_COMMENT_BITS (table, a) &			\
    ((startp) ? SYNTAX_FIRST_CHAR_START :		\
     SYNTAX_FIRST_CHAR_END) & (style))			\
   && (SYNTAX_COMMENT_BITS (table, b) &			\
    ((startp) ? SYNTAX_SECOND_CHAR_START : 		\
     SYNTAX_SECOND_CHAR_END) & (style)))

#define SYNTAX_COMMENT_MASK_START(table, a, b)			\
  ((STYLE_FOUND_P (table, a, b, 1, SYNTAX_COMMENT_STYLE_A)	\
    ? SYNTAX_COMMENT_STYLE_A					\
    : (STYLE_FOUND_P (table, a, b, 1, SYNTAX_COMMENT_STYLE_B)	\
         ? SYNTAX_COMMENT_STYLE_B				\
	 : 0)))

#define SYNTAX_COMMENT_MASK_END(table, a, b)			\
  ((STYLE_FOUND_P (table, a, b, 0, SYNTAX_COMMENT_STYLE_A)	\
   ? SYNTAX_COMMENT_STYLE_A					\
   : (STYLE_FOUND_P (table, a, b, 0, SYNTAX_COMMENT_STYLE_B)	\
      ? SYNTAX_COMMENT_STYLE_B					\
      : 0)))

#define STYLE_FOUND_1CHAR_P(table, a, style)	\
  ((SYNTAX_COMMENT_BITS (table, a) & (style)))

#define SYNTAX_COMMENT_1CHAR_MASK(table, a)			\
  ((STYLE_FOUND_1CHAR_P (table, a, SYNTAX_COMMENT_STYLE_A)	\
   ? SYNTAX_COMMENT_STYLE_A					\
   : (STYLE_FOUND_1CHAR_P (table, a, SYNTAX_COMMENT_STYLE_B)	\
      ? SYNTAX_COMMENT_STYLE_B					\
	 : 0)))

EXFUN (Fchar_syntax, 2);
EXFUN (Fforward_word, 2);

/* The standard syntax table is stored where it will automatically
   be used in all new buffers.  */
extern Lisp_Object Vstandard_syntax_table;

/* 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 CONST unsigned char syntax_spec_code[0400];

/* Indexed by syntax code, give the letter that describes it. */

extern CONST unsigned char syntax_code_spec[];

Lisp_Object scan_lists (struct buffer *buf, Bufpos from, int count,
			int depth, int sexpflag, int no_error);
int char_quoted (struct buffer *buf, Bufpos pos);

/* NOTE: This does not refer to the mirror table, but to the
   syntax table itself. */
Lisp_Object syntax_match (Lisp_Object table, Emchar ch);

extern int no_quit_in_re_search;
extern struct buffer *regex_emacs_buffer;

void update_syntax_table (struct Lisp_Char_Table *ct);

#endif /* _XEMACS_SYNTAX_H_ */
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