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104 lines
4.3 KiB
C
104 lines
4.3 KiB
C
/* Declarations having to do with GNU Emacs syntax tables.
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Copyright (C) 1985, 1993 Free Software Foundation, Inc.
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This file is part of GNU Emacs.
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GNU Emacs is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 1, or (at your option)
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any later version.
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GNU Emacs is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Emacs; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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extern Lisp_Object Qsyntax_table_p;
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extern Lisp_Object Fsyntax_table_p (), Fsyntax_table (), Fset_syntax_table ();
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/* The standard syntax table is stored where it will automatically
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be used in all new buffers. */
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#define Vstandard_syntax_table buffer_defaults.syntax_table
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/* A syntax table is a Lisp vector of length 0400, whose elements are integers.
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The low 8 bits of the integer is a code, as follows:
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*/
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enum syntaxcode
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{
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Swhitespace, /* for a whitespace character */
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Spunct, /* for random punctuation characters */
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Sword, /* for a word constituent */
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Ssymbol, /* symbol constituent but not word constituent */
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Sopen, /* for a beginning delimiter */
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Sclose, /* for an ending delimiter */
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Squote, /* for a prefix character like Lisp ' */
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Sstring, /* for a string-grouping character like Lisp " */
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Smath, /* for delimiters like $ in Tex. */
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Sescape, /* for a character that begins a C-style escape */
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Scharquote, /* for a character that quotes the following character */
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Scomment, /* for a comment-starting character */
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Sendcomment, /* for a comment-ending character */
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Smax /* Upper bound on codes that are meaningful */
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};
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#define SYNTAX(c) \
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((enum syntaxcode) (XINT (XVECTOR (current_buffer->syntax_table)->contents[(unsigned char) (c)]) & 0377))
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/* The next 8 bits of the number is a character,
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the matching delimiter in the case of Sopen or Sclose. */
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#define SYNTAX_MATCH(c) \
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((XINT (XVECTOR (current_buffer->syntax_table)->contents[(unsigned char) (c)]) >> 8) & 0377)
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/* Then there are six single-bit flags that have the following meanings:
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1. This character is the first of a two-character comment-start sequence.
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2. This character is the second of a two-character comment-start sequence.
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3. This character is the first of a two-character comment-end sequence.
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4. This character is the second of a two-character comment-end sequence.
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5. This character is a prefix, for backward-prefix-chars.
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Note that any two-character sequence whose first character has flag 1
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and whose second character has flag 2 will be interpreted as a comment start.
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bit 6 is used to discriminate between two different comment styles.
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Languages such as C++ allow two orthogonal syntax start/end pairs
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and bit 6 is used to determine whether a comment-end or Scommentend
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ends style a or b. Comment start sequences can start style a or b.
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Style a is always the default.
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*/
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#define SYNTAX_COMSTART_FIRST(c) \
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((XINT (XVECTOR (current_buffer->syntax_table)->contents[(unsigned char) (c)]) >> 16) & 1)
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#define SYNTAX_COMSTART_SECOND(c) \
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((XINT (XVECTOR (current_buffer->syntax_table)->contents[(unsigned char) (c)]) >> 17) & 1)
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#define SYNTAX_COMEND_FIRST(c) \
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((XINT (XVECTOR (current_buffer->syntax_table)->contents[(unsigned char) (c)]) >> 18) & 1)
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#define SYNTAX_COMEND_SECOND(c) \
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((XINT (XVECTOR (current_buffer->syntax_table)->contents[(unsigned char) (c)]) >> 19) & 1)
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#define SYNTAX_PREFIX(c) \
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((XINT (XVECTOR (current_buffer->syntax_table)->contents[(unsigned char) (c)]) >> 20) & 1)
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/* extract the comment style bit from the syntax table entry */
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#define SYNTAX_COMMENT_STYLE(c) \
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((XINT (XVECTOR (current_buffer->syntax_table)->contents[c]) >> 21) & 1)
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/* This array, indexed by a character, contains the syntax code which that
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character signifies (as a char). For example,
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(enum syntaxcode) syntax_spec_code['w'] is Sword. */
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extern unsigned char syntax_spec_code[0400];
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/* Indexed by syntax code, give the letter that describes it. */
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extern char syntax_code_spec[13];
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