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/* Definitions for data structures and routines for the regular

   expression library, version 0.12.

​

   Copyright (C) 1985, 1989, 1990, 1991, 1992, 1993 Free Software Foundation, Inc.

​

   This program 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.

​

   This program 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 this program; if not, write to the Free Software

   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

​

#ifndef __REGEXP_LIBRARY_H__

#define __REGEXP_LIBRARY_H__

​

/* POSIX says that <sys/types.h> must be included (by the caller) before

   <regex.h>.  */

​

#ifdef VMS

/* VMS doesn't have `size_t' in <sys/types.h>, even though POSIX says it

   should be there.  */

#include <stddef.h>

#endif

​

​

/* The following bits are used to determine the regexp syntax we

   recognize.  The set/not-set meanings are chosen so that Emacs syntax

   remains the value 0.  The bits are given in alphabetical order, and

   the definitions shifted by one from the previous bit; thus, when we

   add or remove a bit, only one other definition need change.  */

typedef unsigned reg_syntax_t;

​

/* If this bit is not set, then \ inside a bracket expression is literal.

   If set, then such a \ quotes the following character.  */

#define RE_BACKSLASH_ESCAPE_IN_LISTS (1)

​

/* If this bit is not set, then + and ? are operators, and \+ and \? are

     literals.

   If set, then \+ and \? are operators and + and ? are literals.  */

#define RE_BK_PLUS_QM (RE_BACKSLASH_ESCAPE_IN_LISTS << 1)

​

/* If this bit is set, then character classes are supported.  They are:

     [:alpha:], [:upper:], [:lower:],  [:digit:], [:alnum:], [:xdigit:],

     [:space:], [:print:], [:punct:], [:graph:], and [:cntrl:].

   If not set, then character classes are not supported.  */

#define RE_CHAR_CLASSES (RE_BK_PLUS_QM << 1)

​

/* If this bit is set, then ^ and $ are always anchors (outside bracket

     expressions, of course).

   If this bit is not set, then it depends:

        ^  is an anchor if it is at the beginning of a regular

           expression or after an open-group or an alternation operator;

        $  is an anchor if it is at the end of a regular expression, or

           before a close-group or an alternation operator.

​

   This bit could be (re)combined with RE_CONTEXT_INDEP_OPS, because