Subversion Repositories planix.SVN

/*
 * Changes by Gunnar Ritter, Freiburg i. Br., Germany, November 2002.
 *
 * Sccsid @(#)regdfa.h  1.3 (gritter) 9/22/03
 */
/*  UNIX(R) Regular Expresssion Library
 *
 *  Note: Code is released under the GNU LGPL
 *
 *  Copyright (C) 2001 Caldera International, Inc.
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library 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
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to:
 *        Free Software Foundation, Inc.
 *        59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/*      #include "synonyms.h"   */

/*
* Deterministic Finite Automata.
*/

#ifndef LIBUXRE_REGDFA_H
#define LIBUXRE_REGDFA_H

#include <re.h>

typedef struct
{
        Bracket *bkt;   /* extra info for ROP_BKT */
        size_t  nset;   /* number of items in the follow set */
        size_t  seti;   /* index into the follow set strip */
        w_type  op;     /* the leaf match operation */
} Posn;

#define CACHESZ 32      /* max. states to remember (must fit in uchar) */
#define NCHAR   (1 << CHAR_BIT)

struct re_dfa_ /*Dfa*/
{
        unsigned char   *posset;        /* signatures built here */
        size_t          *posfoll;       /* follow strip for posn[] */
        size_t          *sigfoll;       /* follow strip for sigi[] */
        size_t          *cursig;        /* current state's signature */
        Posn            *posn;          /* important positions */
        size_t          nposn;          /* length of posn,cursig,posset */
        size_t          used;           /* used portion of follow strip */
        size_t          avail;          /* unused part of follow strip */
        size_t          nset;           /* # items nonzero in posset[] */
        size_t          nsig[CACHESZ];  /* number of items in signature */
        size_t          sigi[CACHESZ];  /* index into sigfoll[] */
        unsigned char   acc[CACHESZ];   /* nonzero for accepting states */
        unsigned char   leftmost;       /* leftmost() start, not BOL */
        unsigned char   leftbol;        /* leftmost() start, w/BOL */
        unsigned char   anybol;         /* any match start, w/BOL */
        unsigned char   nfix;           /* number of invariant states */
        unsigned char   top;            /* next state index available */
        unsigned char   flags;          /* interesting flags */
        unsigned char   trans[CACHESZ][NCHAR];  /* goto table */
};

extern int       regtrans(Dfa *, int, w_type, int);

#endif  /* !LIBUXRE_REGDFA_H */