/* Declarations having to do with GNU Emacs syntax tables.
- Copyright (C) 1985 Free Software Foundation, Inc.
+ Copyright (C) 1985, 1993 Free Software Foundation, Inc.
This file is part of GNU Emacs.
#define SYNTAX_MATCH(c) \
((XINT (XVECTOR (current_buffer->syntax_table)->contents[(unsigned char) (c)]) >> 8) & 0377)
-/* Then there are five single-bit flags that have the following meanings:
+/* 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. */
+ 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) \
((XINT (XVECTOR (current_buffer->syntax_table)->contents[(unsigned char) (c)]) >> 16) & 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 */
+#define SYNTAX_COMMENT_STYLE(c) \
+ ((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. */