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/* Declarations having to do with GNU Emacs syntax tables.
Copyright (C) 1985, 1993-1994, 1997-1998, 2001-2021 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 3 of the License, 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. If not, see <https://www.gnu.org/licenses/>. */
#ifndef EMACS_SYNTAX_H
#define EMACS_SYNTAX_H
#include "buffer.h"
#include "lisp.h"
INLINE_HEADER_BEGIN
extern void update_syntax_table (ptrdiff_t, EMACS_INT, bool, Lisp_Object);
extern void update_syntax_table_forward (ptrdiff_t, bool, Lisp_Object);
/* The standard syntax table is stored where it will automatically
be used in all new buffers. */
#define Vstandard_syntax_table BVAR (&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 */
Scomment_fence, /* Starts/ends comment which is delimited on the
other side by any char with the same syntaxcode. */
Sstring_fence, /* Starts/ends string which is delimited on the
other side by any char with the same syntaxcode. */
Smax /* Upper bound on codes that are meaningful. */
};
struct gl_state_s
{
Lisp_Object object; /* The object we are scanning. */
ptrdiff_t start; /* Where to stop. */
ptrdiff_t stop; /* Where to stop. */
bool use_global; /* Whether to use global_code
or c_s_t. */
Lisp_Object global_code; /* Syntax code of current char. */
Lisp_Object current_syntax_table; /* Syntax table for current pos. */
Lisp_Object old_prop; /* Syntax-table prop at prev pos. */
ptrdiff_t b_property; /* First index where c_s_t is valid. */
ptrdiff_t e_property; /* First index where c_s_t is
not valid. */
bool e_property_truncated; /* true if e_property if was truncated
by parse_sexp_propertize_done. */
INTERVAL forward_i; /* Where to start lookup on forward. */
INTERVAL backward_i; /* or backward movement. The
data in c_s_t is valid
between these intervals,
and possibly at the
intervals too, depending
on: */
/* Offset for positions specified to UPDATE_SYNTAX_TABLE. */
ptrdiff_t offset;
};
extern struct gl_state_s gl_state;
/* Fetch the information from the entry for character C
in the current buffer's syntax table,
or (if VIA_PROPERTY) from globally kept data (gl_state).
Does inheritance. */
INLINE Lisp_Object
syntax_property_entry (int c, bool via_property)
{
if (via_property)
return (gl_state.use_global
? gl_state.global_code
: CHAR_TABLE_REF (gl_state.current_syntax_table, c));
return CHAR_TABLE_REF (BVAR (current_buffer, syntax_table), c);
}
INLINE Lisp_Object
SYNTAX_ENTRY (int c)
{
return syntax_property_entry (c, false);
}
/* Extract the information from the entry for character C
in the current syntax table. */
INLINE int
syntax_property_with_flags (int c, bool via_property)
{
Lisp_Object ent = syntax_property_entry (c, via_property);
return CONSP (ent) ? XFIXNUM (XCAR (ent)) : Swhitespace;
}
INLINE int
SYNTAX_WITH_FLAGS (int c)
{
return syntax_property_with_flags (c, false);
}
INLINE enum syntaxcode
syntax_property (int c, bool via_property)
{
return syntax_property_with_flags (c, via_property) & 0xff;
}
INLINE enum syntaxcode
SYNTAX (int c)
{
return syntax_property (c, false);
}
/* Whether the syntax of the character C has the prefix flag set. */
extern bool syntax_prefix_flag_p (int c);
/* This array, indexed by a character less than 256, contains the
syntax code which that character signifies (as an unsigned char).
For example, syntax_spec_code['w'] == Sword. */
extern unsigned char const syntax_spec_code[0400];
/* Indexed by syntax code, give the letter that describes it. */
extern char const syntax_code_spec[16];
/* Convert the byte offset BYTEPOS into a character position,
for the object recorded in gl_state with SETUP_SYNTAX_TABLE_FOR_OBJECT.
The value is meant for use in code that does nothing when
parse_sexp_lookup_properties is false, so return 0 in that case,
for speed. */
INLINE ptrdiff_t
SYNTAX_TABLE_BYTE_TO_CHAR (ptrdiff_t bytepos)
{
return (! parse_sexp_lookup_properties
? 0
: STRINGP (gl_state.object)
? string_byte_to_char (gl_state.object, bytepos)
: BUFFERP (gl_state.object)
? ((buf_bytepos_to_charpos
(XBUFFER (gl_state.object),
(bytepos + BUF_BEGV_BYTE (XBUFFER (gl_state.object)) - 1)))
- BUF_BEGV (XBUFFER (gl_state.object)) + 1)
: NILP (gl_state.object)
? BYTE_TO_CHAR (bytepos + BEGV_BYTE - 1) - BEGV + 1
: bytepos);
}
/* Make syntax table state (gl_state) good for CHARPOS, assuming it is
currently good for a position before CHARPOS. */
INLINE void
UPDATE_SYNTAX_TABLE_FORWARD (ptrdiff_t charpos)
{ /* Performs just-in-time syntax-propertization. */
if (parse_sexp_lookup_properties && charpos >= gl_state.e_property)
update_syntax_table_forward (charpos + gl_state.offset,
false, gl_state.object);
}
/* Make syntax table state (gl_state) good for CHARPOS, assuming it is
currently good for a position after CHARPOS. */
INLINE void
UPDATE_SYNTAX_TABLE_BACKWARD (ptrdiff_t charpos)
{
if (parse_sexp_lookup_properties && charpos < gl_state.b_property)
update_syntax_table (charpos + gl_state.offset, -1, false, gl_state.object);
}
/* Make syntax table good for CHARPOS. */
INLINE void
UPDATE_SYNTAX_TABLE (ptrdiff_t charpos)
{
UPDATE_SYNTAX_TABLE_BACKWARD (charpos);
UPDATE_SYNTAX_TABLE_FORWARD (charpos);
}
/* Set up the buffer-global syntax table. */
INLINE void
SETUP_BUFFER_SYNTAX_TABLE (void)
{
gl_state.use_global = false;
gl_state.e_property_truncated = false;
gl_state.current_syntax_table = BVAR (current_buffer, syntax_table);
}
extern ptrdiff_t scan_words (ptrdiff_t, EMACS_INT);
extern void SETUP_SYNTAX_TABLE_FOR_OBJECT (Lisp_Object, ptrdiff_t, ptrdiff_t);
INLINE_HEADER_END
#endif /* EMACS_SYNTAX_H */
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