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authorJim Blandy <jimb@redhat.com>1992-01-13 22:04:23 +0000
committerJim Blandy <jimb@redhat.com>1992-01-13 22:04:23 +0000
commit31fe8ae4d9ac80da34cf2d714ec5f6626c25ee9a (patch)
treef8f2127ad6d231db883844bf36b1fed70f78f271 /src/syntax.h
parentbd5cd35fd8b585ad3d87f8be98b45a415fea22c0 (diff)
downloademacs-31fe8ae4d9ac80da34cf2d714ec5f6626c25ee9a.tar.gz
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+/* Declarations having to do with GNU Emacs syntax tables.
+ Copyright (C) 1985 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 1, 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, 675 Mass Ave, Cambridge, MA 02139, 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 Lisp vector of length 0400, whose elements are integers.
+
+The low 8 bits of the integer 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 */
+ Smax /* Upper bound on codes that are meaningful */
+ };
+
+#define SYNTAX(c) \
+ ((enum syntaxcode) (XINT (XVECTOR (current_buffer->syntax_table)->contents[c]) & 0377))
+
+/* The next 8 bits of the number is a character,
+ the matching delimiter in the case of Sopen or Sclose. */
+
+#define SYNTAX_MATCH(c) \
+ ((XINT (XVECTOR (current_buffer->syntax_table)->contents[c]) >> 8) & 0377)
+
+/* Then there are five 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. */
+
+#define SYNTAX_COMSTART_FIRST(c) \
+ ((XINT (XVECTOR (current_buffer->syntax_table)->contents[c]) >> 16) & 1)
+
+#define SYNTAX_COMSTART_SECOND(c) \
+ ((XINT (XVECTOR (current_buffer->syntax_table)->contents[c]) >> 17) & 1)
+
+#define SYNTAX_COMEND_FIRST(c) \
+ ((XINT (XVECTOR (current_buffer->syntax_table)->contents[c]) >> 18) & 1)
+
+#define SYNTAX_COMEND_SECOND(c) \
+ ((XINT (XVECTOR (current_buffer->syntax_table)->contents[c]) >> 19) & 1)
+
+#define SYNTAX_PREFIX(c) \
+ ((XINT (XVECTOR (current_buffer->syntax_table)->contents[c]) >> 20) & 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[13];