-/* $Id: rsbetween.c,v 1.7 2002-08-02 19:26:57 adam Exp $
+/* $Id: rsbetween.c,v 1.13 2004-06-08 15:05:16 heikki Exp $
Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002
Index Data Aps
*/
+/* rsbetween is (mostly) used for xml searches. It returns the hits of the
+ * "middle" rset, that are in between the "left" and "right" rsets. For
+ * example "Shakespeare" in between "<title>" and </title>. The thing is
+ * complicated by the inclusion of attributes (from their own rset). If attrs
+ * specified, they must match the "left" rset (start tag). "Hamlet" between
+ * "<title lang=eng>" and "</title>". (This assumes that the attributes are
+ * indexed to the same seqno as the tags).
+*/
#include <stdio.h>
#include <stdlib.h>
#include <rsbetween.h>
#include <zebrautl.h>
+#define RSBETWEEN_DEBUG 0
+
static void *r_create_between(RSET ct, const struct rset_control *sel, void *parms);
static RSFD r_open_between (RSET ct, int flag);
static void r_close_between (RSFD rfd);
static void r_delete_between (RSET ct);
static void r_rewind_between (RSFD rfd);
+static int r_forward_between(RSET ct, RSFD rfd, void *buf, int *term_index,
+ int (*cmpfunc)(const void *p1, const void *p2),
+ const void *untilbuf);
static int r_count_between (RSET ct);
static int r_read_between (RSFD rfd, void *buf, int *term_index);
static int r_write_between (RSFD rfd, const void *buf);
r_close_between,
r_delete_between,
r_rewind_between,
+ r_forward_between, /* rset_default_forward, */
r_count_between,
r_read_between,
r_write_between,
struct rset_between_info *info;
};
+#if RSBETWEEN_DEBUG
+static void log2 (struct rset_between_rfd *p, char *msg, int cmp_l, int cmp_r)
+{
+ char buf_l[32];
+ char buf_m[32];
+ char buf_r[32];
+ logf(LOG_DEBUG,"btw: %s l=%s(%d/%d) m=%s(%d) r=%s(%d/%d), lev=%d",
+ msg,
+ (*p->info->printer)(p->buf_l, buf_l), p->more_l, cmp_l,
+ (*p->info->printer)(p->buf_m, buf_m), p->more_m,
+ (*p->info->printer)(p->buf_r, buf_r), p->more_r, cmp_r,
+ p->level);
+}
+#endif
+
static void *r_create_between (RSET ct, const struct rset_control *sel,
void *parms)
{
if (flag & RSETF_WRITE)
{
- logf (LOG_FATAL, "between set type is read-only");
- return NULL;
+ logf (LOG_FATAL, "between set type is read-only");
+ return NULL;
}
rfd = (struct rset_between_rfd *) xmalloc (sizeof(*rfd));
rfd->next = info->rfd_list;
rfd->rfd_r = rset_open (info->rset_r, RSETF_READ);
rfd->more_l = rset_read (info->rset_l, rfd->rfd_l, rfd->buf_l,
- &rfd->term_index_l);
+ &rfd->term_index_l);
rfd->more_m = rset_read (info->rset_m, rfd->rfd_m, rfd->buf_m,
- &rfd->term_index_m);
+ &rfd->term_index_m);
rfd->more_r = rset_read (info->rset_r, rfd->rfd_r, rfd->buf_r,
- &rfd->term_index_r);
+ &rfd->term_index_r);
if (info->rset_attr)
{
int dummy;
struct rset_between_info *info = ((struct rset_between_rfd*)rfd)->info;
struct rset_between_rfd *p = (struct rset_between_rfd *) rfd;
+#if RSBETWEEN_DEBUG
logf (LOG_DEBUG, "rsbetween_rewind");
+#endif
rset_rewind (info->rset_l, p->rfd_l);
rset_rewind (info->rset_m, p->rfd_m);
rset_rewind (info->rset_r, p->rfd_r);
p->level=0;
}
-static int r_count_between (RSET ct)
+
+
+static int r_forward_between(RSET ct, RSFD rfd, void *buf, int *term_index,
+ int (*cmpfunc)(const void *p1, const void *p2),
+ const void *untilbuf)
{
- return 0;
+ struct rset_between_info *info = ((struct rset_between_rfd*)rfd)->info;
+ struct rset_between_rfd *p = (struct rset_between_rfd *) rfd;
+ int rc;
+#if RSBETWEEN_DEBUG
+ log2( p, "fwd: before forward", 0,0);
+#endif
+ /* It is enough to forward the m pointer here, the read will */
+ /* naturally forward the l, m, and attr pointers */
+ if (p->more_m)
+ p->more_m=rset_forward(info->rset_m,p->rfd_m, p->buf_m,
+ &p->term_index_m, info->cmp,untilbuf);
+#if RSBETWEEN_DEBUG
+ log2( p, "fwd: after forward M", 0,0);
+#endif
+ rc = r_read_between(rfd, buf, term_index);
+#if RSBETWEEN_DEBUG
+ log2( p, "fwd: after forward", 0,0);
+#endif
+ return rc;
}
-static void logit( struct rset_between_info *info, char *prefix, void *l, void *m, void *r)
+static int r_count_between (RSET ct)
{
- char buf_l[32];
- char buf_m[32];
- char buf_r[32];
- logf(LOG_DEBUG,"btw: %s l=%s m=%s r=%s",
- prefix,
- (*info->printer)(l, buf_l),
- (*info->printer)(m, buf_m),
- (*info->printer)(r, buf_r) );
+ return 0;
}
+
+
static int r_read_between (RSFD rfd, void *buf, int *term_index)
{
struct rset_between_rfd *p = (struct rset_between_rfd *) rfd;
struct rset_between_info *info = p->info;
- int cmp_l;
- int cmp_r;
- int attr_match;
+ int cmp_l=0;
+ int cmp_r=0;
+ int attr_match = 0;
while (p->more_m)
{
- logit( info, "start of loop", p->buf_l, p->buf_m, p->buf_r);
-
- /* forward L until past m, count levels, note rec boundaries */
- if (p->more_l)
- cmp_l= (*info->cmp)(p->buf_l, p->buf_m);
- else
- cmp_l=2; /* past this record */
- logf(LOG_DEBUG, "cmp_l=%d", cmp_l);
+#if RSBETWEEN_DEBUG
+ log2( p, "start of loop", cmp_l, cmp_r);
+#endif
+
+ /* forward L until past m, count levels, note rec boundaries */
+ if (p->more_l)
+ cmp_l= (*info->cmp)(p->buf_l, p->buf_m);
+ else
+ {
+ p->level = 0;
+ cmp_l=2; /* past this record */
+ }
+#if RSBETWEEN_DEBUG
+ log2( p, "after first L", cmp_l, cmp_r);
+#endif
while (cmp_l < 0) /* l before m */
- {
+ {
if (cmp_l == -2)
- p->level=0; /* earlier record */
+ p->level=0; /* earlier record */
if (cmp_l == -1)
{
- p->level++; /* relevant start tag */
+ p->level++; /* relevant start tag */
if (!info->rset_attr)
attr_match = 1;
}
else if (cmp_attr > 0)
break;
- p->more_attr = rset_read (info->rset_attr, p->rfd_attr,
+ else if (cmp_attr==-1)
+ p->more_attr = rset_read (info->rset_attr, p->rfd_attr,
p->buf_attr, &dummy_term);
- }
+ /* if we had a forward that went all the way to
+ * the seqno, we could use that. But fwd only goes
+ * to the sysno */
+ else if (cmp_attr==-2)
+ {
+ p->more_attr = rset_forward(
+ info->rset_attr, p->rfd_attr,
+ p->buf_attr, &dummy_term,
+ info->cmp, p->buf_l);
+#if RSBETWEEN_DEBUG
+ logf(LOG_DEBUG, "btw: after frowarding attr m=%d",p->more_attr);
+#endif
+ }
+ } /* while more_attr */
}
}
- if (p->more_l)
+#define NEWCODE 1
+#if NEWCODE
+ if (cmp_l==-2)
+ {
+ if (p->more_l)
+ {
+ p->more_l=rset_forward(
+ info->rset_l, p->rfd_l,
+ p->buf_l, &p->term_index_l,
+ info->cmp, p->buf_m);
+ if (p->more_l)
+ cmp_l= (*info->cmp)(p->buf_l, p->buf_m);
+ else
+ cmp_l=2;
+#if RSBETWEEN_DEBUG
+ log2( p, "after forwarding L", cmp_l, cmp_r);
+#endif
+ }
+ } else
{
p->more_l = rset_read (info->rset_l, p->rfd_l, p->buf_l,
- &p->term_index_l);
- cmp_l= (*info->cmp)(p->buf_l, p->buf_m);
- logit( info, "forwarded L", p->buf_l, p->buf_m, p->buf_r);
- logf(LOG_DEBUG, " cmp_l=%d", cmp_l);
+ &p->term_index_l);
+ }
+#else
+ p->more_l = rset_read (info->rset_l, p->rfd_l, p->buf_l,
+ &p->term_index_l);
+#endif
+ if (p->more_l)
+ {
+ cmp_l= (*info->cmp)(p->buf_l, p->buf_m);
}
else
- cmp_l=2;
+ cmp_l=2;
+#if RSBETWEEN_DEBUG
+ log2( p, "end of L loop", cmp_l, cmp_r);
+#endif
} /* forward L */
- /* forward R until past m, count levels */
+ /* forward R until past m, count levels */
+#if RSBETWEEN_DEBUG
+ log2( p, "Before moving R", cmp_l, cmp_r);
+#endif
if (p->more_r)
- cmp_r= (*info->cmp)(p->buf_r, p->buf_m);
- else
- cmp_r=2;
- logf(LOG_DEBUG, "cmp_r=%d", cmp_r);
+ cmp_r= (*info->cmp)(p->buf_r, p->buf_m);
+ else
+ cmp_r=2;
+#if RSBETWEEN_DEBUG
+ log2( p, "after first R", cmp_l, cmp_r);
+#endif
while (cmp_r < 0) /* r before m */
- {
- /* -2, earlier record, doesn't matter */
+ {
+ /* -2, earlier record, don't count level */
if (cmp_r == -1)
- p->level--; /* relevant end tag */
+ p->level--; /* relevant end tag */
if (p->more_r)
{
+#if NEWCODE
+ if (cmp_r==-2)
+ {
+ p->more_r=rset_forward(
+ info->rset_r, p->rfd_r,
+ p->buf_r, &p->term_index_r,
+ info->cmp, p->buf_m);
+ } else
+ {
+ p->more_r = rset_read (info->rset_r, p->rfd_r, p->buf_r,
+ &p->term_index_r);
+ }
+ if (p->more_r)
+ cmp_r= (*info->cmp)(p->buf_r, p->buf_m);
+
+#else
p->more_r = rset_read (info->rset_r, p->rfd_r, p->buf_r,
- &p->term_index_r);
- cmp_r= (*info->cmp)(p->buf_r, p->buf_m);
- logit( info, "forwarded R", p->buf_l, p->buf_m, p->buf_r);
- logf(LOG_DEBUG, " cmp_r=%d", cmp_r);
+ &p->term_index_r);
+ cmp_r= (*info->cmp)(p->buf_r, p->buf_m);
+#endif
}
else
- cmp_r=2;
+ cmp_r=2;
+#if RSBETWEEN_DEBUG
+ log2( p, "End of R loop", cmp_l, cmp_r);
+#endif
} /* forward R */
-
- if ( ( p->level <= 0 ) && ! p->more_l)
- return 0; /* no more start tags, nothing more to find */
- if ( attr_match && p->level > 0) /* within a tag pair (or deeper) */
- {
- memcpy (buf, p->buf_m, info->key_size);
+ if ( ( p->level <= 0 ) && ! p->more_l)
+ return 0; /* no more start tags, nothing more to find */
+
+ if ( attr_match && p->level > 0) /* within a tag pair (or deeper) */
+ {
+ memcpy (buf, p->buf_m, info->key_size);
*term_index = p->term_index_m;
- logit( info, "Returning a hit (m)", p->buf_l, p->buf_m, p->buf_r);
+#if RSBETWEEN_DEBUG
+ log2( p, "Returning a hit (and forwarding m)", cmp_l, cmp_r);
+#endif
p->more_m = rset_read (info->rset_m, p->rfd_m, p->buf_m,
&p->term_index_m);
- return 1;
- }
- else
- if ( ! p->more_l ) /* not in data, no more starts */
- return 0; /* ergo, nothing can be found. stop scanning */
-
+ if (cmp_l == 2)
+ p->level = 0;
+ return 1;
+ }
+ else if ( ! p->more_l ) /* not in data, no more starts */
+ {
+#if RSBETWEEN_DEBUG
+ log2( p, "no more starts, exiting without a hit", cmp_l, cmp_r);
+#endif
+ return 0; /* ergo, nothing can be found. stop scanning */
+ }
+#if NEWCODE
+ if (cmp_l == 2)
+ {
+ p->level = 0;
+ p->more_m=rset_forward(
+ info->rset_m, p->rfd_m,
+ p->buf_m, &p->term_index_m,
+ info->cmp, p->buf_l);
+ } else
+ {
+ p->more_m = rset_read (info->rset_m, p->rfd_m, p->buf_m,
+ &p->term_index_m);
+ }
+#else
+ if (cmp_l == 2)
+ p->level = 0;
p->more_m = rset_read (info->rset_m, p->rfd_m, p->buf_m,
&p->term_index_m);
+#endif
+#if RSBETWEEN_DEBUG
+ log2( p, "End of M loop", cmp_l, cmp_r);
+#endif
} /* while more_m */
-
- logf(LOG_DEBUG,"Exiting, no more stuff in m");
+
+#if RSBETWEEN_DEBUG
+ log2( p, "Exiting, nothing more in m", cmp_l, cmp_r);
+#endif
return 0; /* no more data possible */
projects / idzebra-moved-to-github.git / blobdiff