-/*
- * Copyright (C) 1994-1996, Index Data I/S
- * All rights reserved.
- * Sebastian Hammer, Adam Dickmeiss
- *
- * $Log: lookgrep.c,v $
- * Revision 1.20 1997-10-27 14:33:03 adam
- * Moved towards generic character mapping depending on "structure"
- * field in abstract syntax file. Fixed a few memory leaks. Fixed
- * bug with negative integers when doing searches with relational
- * operators.
- *
- * Revision 1.19 1997/09/18 08:59:18 adam
- * Extra generic handle for the character mapping routines.
- *
- * Revision 1.18 1997/09/05 15:29:58 adam
- * Changed prototype for chr_map_input - added const.
- * Added support for C++, headers uses extern "C" for public definitions.
- *
- * Revision 1.17 1996/06/04 10:20:06 adam
- * Added support for character mapping.
- *
- * Revision 1.16 1996/05/24 14:46:04 adam
- * Added dict_grep_cmap function to define user-mapping in grep lookups.
- *
- * Revision 1.15 1996/03/20 09:35:18 adam
- * Function dict_lookup_grep got extra parameter, init_pos, which marks
- * from which position in pattern approximate pattern matching should occur.
- *
- * Revision 1.14 1996/02/02 13:43:51 adam
- * The public functions simply use char instead of Dict_char to represent
- * search strings. Dict_char is used internally only.
- *
- * Revision 1.13 1996/01/08 09:09:30 adam
- * Function dfa_parse got 'const' string argument.
- *
- * Revision 1.12 1995/12/11 09:04:48 adam
- * Bug fix: the lookup/scan/lookgrep didn't handle empty dictionary.
- *
- * Revision 1.11 1995/12/06 14:43:02 adam
- * New function: dict_delete.
- *
- * Revision 1.10 1995/11/16 17:00:44 adam
- * Changed stupid log.
- *
- * Revision 1.9 1995/10/27 13:58:09 adam
- * Makes 'Database unavailable' diagnostic.
- *
- * Revision 1.8 1995/10/19 14:57:21 adam
- * New feature: grep lookup saves length of longest prefix match.
- *
- * Revision 1.7 1995/10/17 18:01:22 adam
- * Userfunc may return non-zero in which case the the grepping stops
- * immediately.
- *
- * Revision 1.6 1995/10/09 16:18:32 adam
- * Function dict_lookup_grep got extra client data parameter.
- *
- * Revision 1.5 1995/09/14 11:52:59 adam
- * Grep handle function parameter info is const now.
- *
- * Revision 1.4 1995/01/24 16:01:02 adam
- * Added -ansi to CFLAGS.
- * Use new API of dfa module.
- *
- * Revision 1.3 1994/10/05 12:16:50 adam
- * Pagesize is a resource now.
- *
- * Revision 1.2 1994/10/04 12:08:07 adam
- * Some bug fixes and some optimizations.
- *
- * Revision 1.1 1994/10/03 17:23:04 adam
- * First version of dictionary lookup with regular expressions and errors.
- *
- */
+/* $Id: lookgrep.c,v 1.32 2006-08-14 10:40:09 adam Exp $
+ Copyright (C) 1995-2006
+ Index Data ApS
+
+This file is part of the Zebra server.
+
+Zebra 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.
+
+Zebra 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+*/
+
+
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <dfa.h>
-#include <dict.h>
+#include "dict-p.h"
typedef unsigned MatchWord;
#define WORD_BITS 32
#define MAX_LENGTH 1024
+/* This code is based
+ * Sun Wu and Udi Manber: Fast Text Searching Allowing Errors.
+ * Communications of the ACM, pp. 83-91, Vol. 35, No. 10, Oct. 1992, USA.
+ * PostScript version of the paper in its submitted form: agrep1.ps)
+ * recommended reading to understand AGREP !
+ *
+ * http://www.tgries.de/agrep/#AGREP1PS
+ * http://www.tgries.de/agrep/doc/agrep1ps.zip
+ */
+
typedef struct {
int n; /* no of MatchWord needed */
int range; /* max no. of errors */
static MatchContext *mk_MatchContext (struct DFA *dfa, int range)
{
- MatchContext *mc = xmalloc (sizeof(*mc));
+ MatchContext *mc = (MatchContext *) xmalloc (sizeof(*mc));
int s;
mc->n = (dfa->no_states+WORD_BITS) / WORD_BITS;
mc->range = range;
mc->fact = (range+1)*mc->n;
- mc->match_mask = xcalloc (mc->n, sizeof(*mc->match_mask));
+ mc->match_mask = (MatchWord *) xcalloc (mc->n, sizeof(*mc->match_mask));
for (s = 0; s<dfa->no_states; s++)
if (dfa->states[s]->rule_no)
dict_bf_readp (dict->dbf, ptr, &p);
lo = 0;
hi = DICT_nodir(p)-1;
- indxp = (short*) ((char*) p+DICT_pagesize(dict)-sizeof(short));
+ indxp = (short*) ((char*) p+DICT_bsize(p)-sizeof(short));
while (lo <= hi)
{
init_pos))
return 1;
dict_bf_readp (dict->dbf, ptr, &p);
- indxp = (short*) ((char*) p+DICT_pagesize(dict)
- -sizeof(short));
+ indxp = (short*) ((char*) p+DICT_bsize(p)-sizeof(short));
}
}
}
struct DFA *dfa = dfa_init();
int i, d;
- logf (LOG_DEBUG, "dict_lookup_grep range=%d", range);
+#if 0
+ debug_dfa_trav = 1;
+ debug_dfa_tran = 1;
+ debug_dfa_followpos = 1;
+ dfa_verbose = 1;
+#endif
+
+ yaz_log (YLOG_DEBUG, "dict_lookup_grep range=%d", range);
for (i = 0; pattern[i]; i++)
{
- logf (LOG_DEBUG, " %3d %c", pattern[i],
+ yaz_log (YLOG_DEBUG, " %3d %c", pattern[i],
(pattern[i] > ' ' && pattern[i] < 127) ? pattern[i] : '?');
}
i = dfa_parse (dfa, &this_pattern);
if (i || *this_pattern)
{
+ yaz_log (YLOG_WARN, "dfa_parse fail=%d", i);
dfa_delete (&dfa);
return -1;
}
mc = mk_MatchContext (dfa, range);
- Rj = xcalloc ((MAX_LENGTH+1) * mc->n, sizeof(*Rj));
+ Rj = (MatchWord *) xcalloc ((MAX_LENGTH+1) * mc->n, sizeof(*Rj));
set_bit (mc, Rj, 0, 0);
for (d = 1; d<=mc->range; d++)
}
}
*max_pos = 0;
- if (dict->head.last > 1)
- i = dict_grep (dict, 1, mc, Rj, 0, client, userfunc, prefix,
+ if (dict->head.root)
+ i = dict_grep (dict, dict->head.root, mc, Rj, 0, client,
+ userfunc, prefix,
dfa, max_pos, init_pos);
else
i = 0;
- logf (LOG_DEBUG, "max_pos = %d", *max_pos);
+ yaz_log (YLOG_DEBUG, "max_pos = %d", *max_pos);
dfa_delete (&dfa);
xfree (Rj);
rm_MatchContext (&mc);
dict->grep_cmap = cmap;
dict->grep_cmap_data = vp;
}
+/*
+ * Local variables:
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ * vim: shiftwidth=4 tabstop=8 expandtab
+ */
+
projects / idzebra-moved-to-github.git / blobdiff