* Sebastian Hammer, Adam Dickmeiss
*
* $Log: zrpn.c,v $
- * Revision 1.11 1995-09-14 11:53:27 adam
+ * Revision 1.12 1995-09-15 14:45:21 adam
+ * Retrieve control.
+ * Work on truncation.
+ *
+ * Revision 1.11 1995/09/14 11:53:27 adam
* First work on regular expressions/truncations.
*
* Revision 1.10 1995/09/11 15:23:26 adam
src->minor = 0;
}
+struct trunc_info {
+ int *indx;
+ char **heap;
+ int heapnum;
+ int (*cmp)(const void *p1, const void *p2);
+ int keysize;
+ char *swapbuf;
+ char *tmpbuf;
+ char *buf;
+};
+
+static void heap_swap (struct trunc_info *ti, int i1, int i2)
+{
+ int swap;
+
+ memcpy (ti->swapbuf, ti->heap[i1], ti->keysize);
+ memcpy (ti->heap[i1], ti->heap[i2], ti->keysize);
+ memcpy (ti->heap[i2], ti->swapbuf, ti->keysize);
+
+ swap = ti->indx[i1];
+ ti->indx[i1] = ti->indx[i2];
+ ti->indx[i2] = swap;
+}
+
+static void heap_delete (struct trunc_info *ti)
+{
+ int cur = 1, child = 2;
+
+ assert (ti->heapnum > 0);
+ memcpy (ti->heap[1], ti->heap[ti->heapnum], ti->keysize);
+ ti->indx[1] = ti->indx[ti->heapnum--];
+ while (child <= ti->heapnum) {
+ if (child < ti->heapnum &&
+ (*ti->cmp)(ti->heap[child], ti->heap[1+child]) > 0)
+ child++;
+ if ((*ti->cmp)(ti->heap[cur], ti->heap[child]) > 0)
+ {
+ heap_swap (ti, cur, child);
+ cur = child;
+ child = 2*cur;
+ }
+ else
+ break;
+ }
+}
+
+static void heap_insert (struct trunc_info *ti, const char *buf, int indx)
+{
+ int cur, parent;
+
+ cur = ++(ti->heapnum);
+ memcpy (ti->heap[cur], buf, ti->keysize);
+ ti->indx[cur] = indx;
+ parent = cur/2;
+ while (parent && (*ti->cmp)(ti->heap[parent], ti->heap[cur]) > 0)
+ {
+ heap_swap (ti, cur, parent);
+ cur = parent;
+ parent = cur/2;
+ }
+}
+
+static
+struct trunc_info *heap_init (int size, int key_size,
+ int (*cmp)(const void *p1, const void *p2))
+{
+ struct trunc_info *ti = xmalloc (sizeof(*ti));
+ int i;
+
+ ++size;
+ ti->heapnum = 0;
+ ti->keysize = key_size;
+ ti->cmp = cmp;
+ ti->indx = xmalloc (size * sizeof(*ti->indx));
+ ti->heap = xmalloc (size * sizeof(*ti->heap));
+ ti->swapbuf = xmalloc (ti->keysize);
+ ti->tmpbuf = xmalloc (ti->keysize);
+ ti->buf = xmalloc (size * ti->keysize);
+ for (i = size; --i >= 0; )
+ ti->heap[i] = ti->buf + ti->keysize * i;
+ return ti;
+}
+
+static void heap_close (struct trunc_info *ti)
+{
+ xfree (ti->indx);
+ xfree (ti->heap);
+ xfree (ti->swapbuf);
+ xfree (ti->tmpbuf);
+ xfree (ti);
+}
+
+static RSET rset_trunc (ISAM isam, ISAM_P *isam_p, int from, int to,
+ int merge_chunk)
+{
+ logf (LOG_DEBUG, "rset_trunc, range=%d-%d", from, to-1);
+ if (from - to > merge_chunk)
+ {
+ return NULL;
+ }
+ else
+ {
+ ISPT *ispt;
+ int i;
+ struct trunc_info *ti;
+ RSET result;
+ RSFD rsfd;
+ rset_temp_parms parms;
+
+ parms.key_size = sizeof (struct it_key);
+ result = rset_create (rset_kind_temp, &parms);
+ rsfd = rset_open (result, 1);
+
+ ti = heap_init (to-from, sizeof(struct it_key),
+ key_compare);
+ for (i = to-from; --i >= 0; )
+ {
+ ispt[i] = is_position (isam, isam_p[from+i]);
+ if (is_readkey (ispt[i], ti->tmpbuf))
+ heap_insert (ti, ti->tmpbuf, i);
+ }
+ while (ti->heapnum)
+ {
+ int n = ti->indx[1];
+
+ rset_write (result, rsfd, ti->heap[1]);
+ heap_delete (ti);
+ if (is_readkey (ispt[n], ti->tmpbuf))
+ heap_insert (ti, ti->tmpbuf, n);
+ }
+ for (i = to-from; --i >= 0; )
+ is_pt_free (ispt[i]);
+ rset_close (result, rsfd);
+ heap_close (ti);
+ return result;
+ }
+}
+
static ISAM_P *isam_p_buf = NULL;
static int isam_p_size = 0;
static int isam_p_indx;
}
static int trunc_term (ZServerInfo *zi, Z_AttributesPlusTerm *zapt,
- ISAM_P **isam_ps,
- int *no, int split_flag)
+ const char *term_sub, ISAM_P **isam_ps)
{
- char termz[IT_MAX_WORD+1];
- char term_sub[IT_MAX_WORD+1];
char term_dict[2*IT_MAX_WORD+2];
- int sizez, i, j;
- char *p0 = termz, *p1 = NULL;
+ int i, j;
const char *info;
AttrType truncation;
int truncation_value;
- Z_Term *term = zapt->term;
- isam_p_indx = 0;
attr_init (&truncation, zapt, 5);
truncation_value = attr_find (&truncation);
logf (LOG_DEBUG, "truncation value %d", truncation_value);
- *no = 0;
+ switch (truncation_value)
+ {
+ case -1: /* not specified */
+ case 100: /* do not truncate */
+ strcpy (term_dict, term_sub);
+ logf (LOG_DEBUG, "dict_lookup: %s", term_dict);
+ if ((info = dict_lookup (zi->wordDict, term_dict)))
+ add_isam_p (info);
+ break;
+ case 1: /* right truncation */
+ strcpy (term_dict, term_sub);
+ strcat (term_dict, ".*");
+ dict_lookup_grep (zi->wordDict, term_dict, 0, grep_handle);
+ break;
+ case 2: /* left truncation */
+ case 3: /* left&right truncation */
+ zi->errCode = 120;
+ return -1;
+ case 101: /* process # in term */
+ for (j = 0, i = 0; term_sub[i] && i < 3; i++)
+ term_dict[j++] = term_sub[i];
+ for (; term_sub[i]; i++)
+ if (term_sub[i] == '#')
+ {
+ term_dict[j++] = '.';
+ term_dict[j++] = '*';
+ }
+ else
+ term_dict[j++] = term_sub[i];
+ term_dict[j] = '\0';
+ dict_lookup_grep (zi->wordDict, term_dict, 0, grep_handle);
+ break;
+ case 102: /* regular expression */
+ strcpy (term_dict, term_sub);
+ dict_lookup_grep (zi->wordDict, term_dict, 0, grep_handle);
+ break;
+ }
+ *isam_ps = isam_p_buf;
+ logf (LOG_DEBUG, "%d positions", isam_p_indx);
+ return 0;
+}
+
+static RSET rpn_search_APT_relevance (ZServerInfo *zi,
+ Z_AttributesPlusTerm *zapt)
+{
+ rset_relevance_parms parms;
+ char termz[IT_MAX_WORD+1];
+ char term_sub[IT_MAX_WORD+1];
+ char *p0 = termz, *p1 = NULL;
+ Z_Term *term = zapt->term;
+ size_t sizez, i;
+
+ parms.key_size = sizeof(struct it_key);
+ parms.max_rec = 100;
+ parms.cmp = key_compare;
+ parms.is = zi->wordIsam;
+
if (term->which != Z_Term_general)
{
zi->errCode = 124;
- return -1;
+ return NULL;
}
sizez = term->u.general->len;
if (sizez > IT_MAX_WORD)
termz[i] = index_char_cvt (term->u.general->buf[i]);
termz[i] = '\0';
+ isam_p_indx = 0; /* global, set by trunc_term - see below */
while (1)
{
- if (split_flag && (p1 = strchr (p0, ' ')))
+ if ((p1 = strchr (p0, ' ')))
{
memcpy (term_sub, p0, p1-p0);
term_sub[p1-p0] = '\0';
}
else
strcpy (term_sub, p0);
- switch (truncation_value)
- {
- case -1: /* not specified */
- case 100: /* do not truncate */
- strcpy (term_dict, term_sub);
- logf (LOG_DEBUG, "dict_lookup: %s", term_dict);
- if ((info = dict_lookup (zi->wordDict, term_dict)))
- add_isam_p (info);
- break;
- case 1: /* right truncation */
- strcpy (term_dict, term_sub);
- strcat (term_dict, ".*");
- dict_lookup_grep (zi->wordDict, term_dict, 0, grep_handle);
- break;
- case 2: /* left truncation */
- case 3: /* left&right truncation */
- zi->errCode = 120;
- return -1;
- case 101: /* process # in term */
- for (j = 0, i = 0; term_sub[i] && i < 3; i++)
- term_dict[j++] = term_sub[i];
- for (; term_sub[i]; i++)
- if (term_sub[i] == '#')
- {
- term_dict[j++] = '.';
- term_dict[j++] = '*';
- }
- else
- term_dict[j++] = term_sub[i];
- term_dict[j] = '\0';
- dict_lookup_grep (zi->wordDict, term_dict, 0, grep_handle);
- break;
- case 102: /* regular expression */
- strcpy (term_dict, term_sub);
- dict_lookup_grep (zi->wordDict, term_dict, 0, grep_handle);
- break;
- }
+ if (trunc_term (zi, zapt, term_sub, &parms.isam_positions))
+ return NULL;
if (!p1)
break;
p0 = p1+1;
- }
- *isam_ps = isam_p_buf;
- *no = isam_p_indx;
- logf (LOG_DEBUG, "%d positions", *no);
- return 0;
-}
-
-static RSET rpn_search_APT_relevance (ZServerInfo *zi,
- Z_AttributesPlusTerm *zapt)
-{
- rset_relevance_parms parms;
-
- parms.key_size = sizeof(struct it_key);
- parms.max_rec = 100;
- parms.cmp = key_compare;
- parms.is = zi->wordIsam;
- if (trunc_term (zi, zapt, &parms.isam_positions,
- &parms.no_isam_positions, 1))
- return NULL;
- if (parms.no_isam_positions > 0)
+ }
+ parms.no_isam_positions = isam_p_indx;
+ if (isam_p_indx > 0)
return rset_create (rset_kind_relevance, &parms);
else
return rset_create (rset_kind_null, NULL);
Z_AttributesPlusTerm *zapt)
{
ISAM_P *isam_positions;
- int no_isam_positions;
rset_isam_parms parms;
- if (trunc_term (zi, zapt, &isam_positions,
- &no_isam_positions, 0))
+ char termz[IT_MAX_WORD+1];
+ Z_Term *term = zapt->term;
+ size_t sizez, i;
+
+ if (term->which != Z_Term_general)
+ {
+ zi->errCode = 124;
return NULL;
- if (no_isam_positions != 1)
+ }
+ sizez = term->u.general->len;
+ if (sizez > IT_MAX_WORD)
+ sizez = IT_MAX_WORD;
+ for (i = 0; i<sizez; i++)
+ termz[i] = index_char_cvt (term->u.general->buf[i]);
+ termz[i] = '\0';
+
+ isam_p_indx = 0; /* global, set by trunc_term - see below */
+ if (trunc_term (zi, zapt, termz, &isam_positions))
+ return NULL;
+ if (isam_p_indx < 1)
return rset_create (rset_kind_null, NULL);
- parms.is = zi->wordIsam;
- parms.pos = *isam_positions;
- return rset_create (rset_kind_isam, &parms);
+ else if (isam_p_indx == 1)
+ {
+ parms.is = zi->wordIsam;
+ parms.pos = *isam_positions;
+ return rset_create (rset_kind_isam, &parms);
+ }
+ else
+ return rset_trunc (zi->wordIsam, isam_positions, 0, isam_p_indx, 200);
}
static RSET rpn_search_APT_phrase (ZServerInfo *zi,
Z_AttributesPlusTerm *zapt)
{
ISAM_P *isam_positions;
- int no_isam_positions;
rset_isam_parms parms;
- if (trunc_term (zi, zapt, &isam_positions,
- &no_isam_positions, 1))
+ char termz[IT_MAX_WORD+1];
+ Z_Term *term = zapt->term;
+ size_t sizez, i;
+
+ if (term->which != Z_Term_general)
+ {
+ zi->errCode = 124;
+ return NULL;
+ }
+ sizez = term->u.general->len;
+ if (sizez > IT_MAX_WORD)
+ sizez = IT_MAX_WORD;
+ for (i = 0; i<sizez; i++)
+ termz[i] = index_char_cvt (term->u.general->buf[i]);
+ termz[i] = '\0';
+
+ isam_p_indx = 0; /* global, set by trunc_term - see below */
+ if (trunc_term (zi, zapt, termz, &isam_positions))
return NULL;
- if (no_isam_positions != 1)
+ if (isam_p_indx != 1)
return rset_create (rset_kind_null, NULL);
parms.is = zi->wordIsam;
parms.pos = *isam_positions;
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