* USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
+
+/**
+ * \file cclfind.c
+ * \brief Implements parsing of a CCL FIND query.
+ *
+ * This source file implements parsing of a CCL Query (ISO8777).
+ * The parser uses predictive parsing, but it does several tokens
+ * of lookahead in the handling of relational operations.. So
+ * it's not really pure.
+ */
+
+
/* CCL find (to rpn conversion)
* Europagate, 1995
*
- * $Id: cclfind.c,v 1.2 2004-08-11 09:02:48 adam Exp $
+ * $Id: cclfind.c,v 1.8 2005-06-25 15:46:03 adam Exp $
*
* Old Europagate log:
*
/* move one token forward */
#define ADVANCE cclp->look_token = cclp->look_token->next
-/*
+/**
* qual_val_type: test for existance of attribute type/value pair.
* qa: Attribute array
* type: Type of attribute to search for
while (q)
{
if (q->type == type && q->kind == CCL_RPN_ATTR_NUMERIC &&
- q->value.numeric == value)
+ q->value.numeric == value)
{
if (attset)
*attset = q->set;
return 0;
}
-/*
+/**
* strxcat: concatenate strings.
* n: Null-terminated Destination string
* src: Source string to be appended (not null-terminated)
*n = '\0';
}
-/*
+/**
* copy_token_name: Return copy of CCL token name
* tp: Pointer to token info.
* return: malloc(3) allocated copy of token name.
return str;
}
-/*
+/**
* mk_node: Create RPN node.
* kind: Type of node.
* return: pointer to allocated node.
return p;
}
-/*
+/**
* ccl_rpn_delete: Delete RPN tree.
* rpn: Pointer to tree.
*/
for (attr = rpn->u.t.attr_list; attr; attr = attr1)
{
attr1 = attr->next;
- if (attr->kind == CCL_RPN_ATTR_STRING)
- xfree(attr->value.str);
+ if (attr->kind == CCL_RPN_ATTR_STRING)
+ xfree(attr->value.str);
if (attr->set)
xfree (attr->set);
xfree (attr);
case CCL_RPN_PROX:
ccl_rpn_delete (rpn->u.p[0]);
ccl_rpn_delete (rpn->u.p[1]);
+ ccl_rpn_delete (rpn->u.p[2]);
break;
}
xfree (rpn);
struct ccl_rpn_attr **qa);
static struct ccl_rpn_attr *add_attr_node (struct ccl_rpn_node *p,
- const char *set, int type)
+ const char *set, int type)
{
struct ccl_rpn_attr *n;
return n;
}
-/*
+/**
* add_attr_numeric: Add attribute (type/value) to RPN term node.
* p: RPN node of type term.
* type: Type of attribute
* set: Attribute set name
*/
static void add_attr_numeric (struct ccl_rpn_node *p, const char *set,
- int type, int value)
+ int type, int value)
{
struct ccl_rpn_attr *n;
}
static void add_attr_string (struct ccl_rpn_node *p, const char *set,
- int type, char *value)
+ int type, char *value)
{
struct ccl_rpn_attr *n;
}
-/*
+/**
* search_term: Parse CCL search term.
* cclp: CCL Parser
* qa: Qualifier attributes already applied.
const char *truncation_aliases;
truncation_aliases =
- ccl_qual_search_special(cclp->bibset, "truncation");
+ ccl_qual_search_special(cclp->bibset, "truncation");
if (!truncation_aliases)
- truncation_aliases = "?";
+ truncation_aliases = "?";
if (qual_val_type (qa, CCL_BIB1_STR, CCL_BIB1_STR_AND_LIST, 0))
and_list = 1;
size_t max = 200;
if (and_list || or_list || !multi)
max = 1;
-
- /* ignore commas when dealing with and-lists .. */
+
+ /* ignore commas when dealing with and-lists .. */
if (and_list && lookahead && lookahead->kind == CCL_TOK_COMMA)
{
- lookahead = lookahead->next;
+ lookahead = lookahead->next;
ADVANCE;
- continue;
+ continue;
}
/* go through each TERM token. If no truncation attribute is yet
met, then look for left/right truncation markers (?) and
{
for (i = 0; i<lookahead->len; i++)
if (lookahead->name[i] == ' ')
- no_spaces++;
- else if (strchr(truncation_aliases, lookahead->name[i]))
+ no_spaces++;
+ else if (strchr(truncation_aliases, lookahead->name[i]))
{
if (no == 0 && i == 0 && lookahead->len >= 1)
left_trunc = 1;
else
mid_trunc = 1;
}
- len += 1+lookahead->len;
+ len += 1+lookahead->len+lookahead->ws_prefix_len;
lookahead = lookahead->next;
}
struct ccl_rpn_attr *attr;
for (attr = qa[i]; attr; attr = attr->next)
- switch(attr->kind)
- {
- case CCL_RPN_ATTR_STRING:
- add_attr_string(p, attr->set, attr->type,
- attr->value.str);
- break;
- case CCL_RPN_ATTR_NUMERIC:
- if (attr->value.numeric > 0)
- { /* deal only with REAL attributes (positive) */
- switch (attr->type)
- {
- case CCL_BIB1_REL:
- if (relation_value != -1)
- continue;
- relation_value = attr->value.numeric;
- break;
- case CCL_BIB1_POS:
- if (position_value != -1)
- continue;
- position_value = attr->value.numeric;
- break;
- case CCL_BIB1_STR:
- if (structure_value != -1)
- continue;
- structure_value = attr->value.numeric;
- break;
- case CCL_BIB1_TRU:
- if (truncation_value != -1)
- continue;
- truncation_value = attr->value.numeric;
- left_trunc = right_trunc = mid_trunc = 0;
- break;
- case CCL_BIB1_COM:
- if (completeness_value != -1)
- continue;
- completeness_value = attr->value.numeric;
- break;
- }
- add_attr_numeric(p, attr->set, attr->type,
- attr->value.numeric);
- }
- }
+ switch(attr->kind)
+ {
+ case CCL_RPN_ATTR_STRING:
+ add_attr_string(p, attr->set, attr->type,
+ attr->value.str);
+ break;
+ case CCL_RPN_ATTR_NUMERIC:
+ if (attr->value.numeric > 0)
+ { /* deal only with REAL attributes (positive) */
+ switch (attr->type)
+ {
+ case CCL_BIB1_REL:
+ if (relation_value != -1)
+ continue;
+ relation_value = attr->value.numeric;
+ break;
+ case CCL_BIB1_POS:
+ if (position_value != -1)
+ continue;
+ position_value = attr->value.numeric;
+ break;
+ case CCL_BIB1_STR:
+ if (structure_value != -1)
+ continue;
+ structure_value = attr->value.numeric;
+ break;
+ case CCL_BIB1_TRU:
+ if (truncation_value != -1)
+ continue;
+ truncation_value = attr->value.numeric;
+ left_trunc = right_trunc = mid_trunc = 0;
+ break;
+ case CCL_BIB1_COM:
+ if (completeness_value != -1)
+ continue;
+ completeness_value = attr->value.numeric;
+ break;
+ }
+ add_attr_numeric(p, attr->set, attr->type,
+ attr->value.numeric);
+ }
+ }
}
/* len now holds the number of characters in the RPN term */
/* no holds the number of CCL tokens (1 or more) */
else
add_attr_numeric (p, attset, CCL_BIB1_STR, 1);
}
-
+
/* make the RPN token */
p->u.t.term = (char *)xmalloc (len);
ccl_assert (p->u.t.term);
src_len--;
src_str++;
}
- else if (i == no-1 && right_trunc)
+ if (i == no-1 && right_trunc)
src_len--;
- if (src_len)
+ if (i && cclp->look_token->ws_prefix_len)
{
- int len = strlen(p->u.t.term);
- if (len &&
- !strchr("-+", *src_str) &&
- !strchr("-+", p->u.t.term[len-1]))
- {
- strcat (p->u.t.term, " ");
- }
+ size_t len = strlen(p->u.t.term);
+ memcpy(p->u.t.term + len, cclp->look_token->ws_prefix_buf,
+ cclp->look_token->ws_prefix_len);
+ p->u.t.term[len + cclp->look_token->ws_prefix_len] = '\0';
}
strxcat (p->u.t.term, src_str, src_len);
ADVANCE;
return search_term_x(cclp, qa, list, 0);
}
-static struct ccl_rpn_node *qualifiers2 (CCL_parser cclp,
- struct ccl_rpn_attr **ap)
+static
+struct ccl_rpn_node *qualifiers_order (CCL_parser cclp,
+ struct ccl_rpn_attr **ap, char *attset)
{
- char *attset;
- int rel;
+ int rel = 0;
+ struct ccl_rpn_node *p;
- if (!qual_val_type(ap, CCL_BIB1_REL, CCL_BIB1_REL_ORDER, &attset))
- {
- /* unordered relation */
- struct ccl_rpn_node *p;
- if (KIND != CCL_TOK_EQ)
- {
- cclp->error_code = CCL_ERR_EQ_EXPECTED;
- return NULL;
- }
- ADVANCE;
- if (KIND == CCL_TOK_LP)
- {
- ADVANCE;
- if (!(p = find_spec (cclp, ap)))
- {
- return NULL;
- }
- if (KIND != CCL_TOK_RP)
- {
- cclp->error_code = CCL_ERR_RP_EXPECTED;
- ccl_rpn_delete (p);
- return NULL;
- }
- ADVANCE;
- }
- else
- p = search_terms (cclp, ap);
- return p;
- }
- /* ordered relation ... */
- rel = 0;
if (cclp->look_token->len == 1)
{
if (cclp->look_token->name[0] == '<')
rel = 6;
}
if (!rel)
+ {
cclp->error_code = CCL_ERR_BAD_RELATION;
- else
+ return NULL;
+ }
+ ADVANCE; /* skip relation */
+ if (rel == 3 &&
+ qual_val_type(ap, CCL_BIB1_REL, CCL_BIB1_REL_PORDER, 0))
{
- struct ccl_rpn_node *p;
-
- ADVANCE; /* skip relation */
- if (KIND == CCL_TOK_TERM &&
- cclp->look_token->next && cclp->look_token->next->len == 1 &&
- cclp->look_token->next->name[0] == '-')
+ /* allow - inside term and treat it as range _always_ */
+ /* relation is =. Extract "embedded" - to separate terms */
+ if (KIND == CCL_TOK_TERM)
{
- struct ccl_rpn_node *p1;
- if (!(p1 = search_term (cclp, ap)))
- return NULL;
- ADVANCE; /* skip '-' */
- if (KIND == CCL_TOK_TERM) /* = term - term ? */
+ size_t i;
+ for (i = 0; i<cclp->look_token->len; i++)
{
- struct ccl_rpn_node *p2;
-
- if (!(p2 = search_term (cclp, ap)))
- {
- ccl_rpn_delete (p1);
- return NULL;
- }
- p = mk_node (CCL_RPN_AND);
- p->u.p[0] = p1;
- add_attr_numeric (p1, attset, CCL_BIB1_REL, 4);
- p->u.p[1] = p2;
- add_attr_numeric (p2, attset, CCL_BIB1_REL, 2);
- return p;
+ if (cclp->look_token->name[i] == '-')
+ break;
}
- else /* = term - */
- {
- add_attr_numeric (p1, attset, CCL_BIB1_REL, 4);
- return p1;
+
+ if (cclp->look_token->len > 1 && i == 0)
+ { /* -xx*/
+ struct ccl_token *ntoken = ccl_token_add (cclp->look_token);
+
+ ntoken->kind = CCL_TOK_TERM;
+ ntoken->name = cclp->look_token->name + 1;
+ ntoken->len = cclp->look_token->len - 1;
+
+ cclp->look_token->len = 1;
+ cclp->look_token->name = "-";
+ }
+ else if (cclp->look_token->len > 1 && i == cclp->look_token->len-1)
+ { /* xx- */
+ struct ccl_token *ntoken = ccl_token_add (cclp->look_token);
+
+ ntoken->kind = CCL_TOK_TERM;
+ ntoken->name = "-";
+ ntoken->len = 1;
+
+ (cclp->look_token->len)--;
+ }
+ else if (cclp->look_token->len > 2 && i < cclp->look_token->len)
+ { /* xx-yy */
+ struct ccl_token *ntoken1 = ccl_token_add (cclp->look_token);
+ struct ccl_token *ntoken2 = ccl_token_add (ntoken1);
+
+ ntoken1->kind = CCL_TOK_TERM; /* generate - */
+ ntoken1->name = "-";
+ ntoken1->len = 1;
+
+ ntoken2->kind = CCL_TOK_TERM; /* generate yy */
+ ntoken2->name = cclp->look_token->name + (i+1);
+ ntoken2->len = cclp->look_token->len - (i+1);
+
+ cclp->look_token->len = i; /* adjust xx */
+ }
+ else if (i == cclp->look_token->len &&
+ cclp->look_token->next &&
+ cclp->look_token->next->kind == CCL_TOK_TERM &&
+ cclp->look_token->next->len > 1 &&
+ cclp->look_token->next->name[0] == '-')
+
+ { /* xx -yy */
+ /* we _know_ that xx does not have - in it */
+ struct ccl_token *ntoken = ccl_token_add (cclp->look_token);
+
+ ntoken->kind = CCL_TOK_TERM; /* generate - */
+ ntoken->name = "-";
+ ntoken->len = 1;
+
+ (ntoken->next->name)++; /* adjust yy */
+ (ntoken->next->len)--;
}
}
- else if (cclp->look_token->len == 1 &&
- cclp->look_token->name[0] == '-') /* = - term ? */
- {
- ADVANCE;
- if (!(p = search_term (cclp, ap)))
- return NULL;
- add_attr_numeric (p, attset, CCL_BIB1_REL, 2);
- return p;
- }
- else if (KIND == CCL_TOK_LP)
+ }
+
+ if (rel == 3 &&
+ KIND == CCL_TOK_TERM &&
+ cclp->look_token->next && cclp->look_token->next->len == 1 &&
+ cclp->look_token->next->name[0] == '-')
+ {
+ struct ccl_rpn_node *p1;
+ if (!(p1 = search_term (cclp, ap)))
+ return NULL;
+ ADVANCE; /* skip '-' */
+ if (KIND == CCL_TOK_TERM) /* = term - term ? */
{
- ADVANCE;
- if (!(p = find_spec (cclp, ap)))
- return NULL;
- if (KIND != CCL_TOK_RP)
+ struct ccl_rpn_node *p2;
+
+ if (!(p2 = search_term (cclp, ap)))
{
- cclp->error_code = CCL_ERR_RP_EXPECTED;
- ccl_rpn_delete (p);
+ ccl_rpn_delete (p1);
return NULL;
}
- ADVANCE;
+ p = mk_node (CCL_RPN_AND);
+ p->u.p[0] = p1;
+ add_attr_numeric (p1, attset, CCL_BIB1_REL, 4);
+ p->u.p[1] = p2;
+ add_attr_numeric (p2, attset, CCL_BIB1_REL, 2);
return p;
}
- else
+ else /* = term - */
{
- if (!(p = search_terms (cclp, ap)))
- return NULL;
- add_attr_numeric (p, attset, CCL_BIB1_REL, rel);
- return p;
+ add_attr_numeric (p1, attset, CCL_BIB1_REL, 4);
+ return p1;
}
- cclp->error_code = CCL_ERR_TERM_EXPECTED;
}
+ else if (rel == 3 &&
+ cclp->look_token->len == 1 &&
+ cclp->look_token->name[0] == '-') /* = - term ? */
+ {
+ ADVANCE;
+ if (!(p = search_term (cclp, ap)))
+ return NULL;
+ add_attr_numeric (p, attset, CCL_BIB1_REL, 2);
+ return p;
+ }
+ else if (KIND == CCL_TOK_LP)
+ {
+ ADVANCE;
+ if (!(p = find_spec (cclp, ap)))
+ return NULL;
+ if (KIND != CCL_TOK_RP)
+ {
+ cclp->error_code = CCL_ERR_RP_EXPECTED;
+ ccl_rpn_delete (p);
+ return NULL;
+ }
+ ADVANCE;
+ return p;
+ }
+ else
+ {
+ if (!(p = search_terms (cclp, ap)))
+ return NULL;
+ add_attr_numeric (p, attset, CCL_BIB1_REL, rel);
+ return p;
+ }
+ cclp->error_code = CCL_ERR_TERM_EXPECTED;
return NULL;
}
-/*
+static
+struct ccl_rpn_node *qualifiers2 (CCL_parser cclp, struct ccl_rpn_attr **ap)
+{
+ char *attset;
+ struct ccl_rpn_node *p;
+
+ if (qual_val_type(ap, CCL_BIB1_REL, CCL_BIB1_REL_ORDER, &attset)
+ || qual_val_type(ap, CCL_BIB1_REL, CCL_BIB1_REL_PORDER, &attset))
+ return qualifiers_order(cclp, ap, attset);
+
+ /* unordered relation */
+ if (KIND != CCL_TOK_EQ)
+ {
+ cclp->error_code = CCL_ERR_EQ_EXPECTED;
+ return NULL;
+ }
+ ADVANCE;
+ if (KIND == CCL_TOK_LP)
+ {
+ ADVANCE;
+ if (!(p = find_spec (cclp, ap)))
+ {
+ return NULL;
+ }
+ if (KIND != CCL_TOK_RP)
+ {
+ cclp->error_code = CCL_ERR_RP_EXPECTED;
+ ccl_rpn_delete (p);
+ return NULL;
+ }
+ ADVANCE;
+ }
+ else
+ p = search_terms (cclp, ap);
+ return p;
+}
+
+/**
* qualifiers1: Parse CCL qualifiers and search terms.
* cclp: CCL Parser
* la: Token pointer to RELATION token.
}
-/*
+/**
* search_terms: Parse CCL search terms - including proximity.
* cclp: CCL Parser
* qa: Qualifier attributes already applied.
return p1;
}
-/*
+/**
* search_elements: Parse CCL search elements
* cclp: CCL Parser
* qa: Qualifier attributes already applied.
}
}
-/*
+/**
* find_spec: Parse CCL find specification
* cclp: CCL Parser
* qa: Qualifier attributes already applied.
{
struct ccl_rpn_node *p;
-
-
cclp->look_token = list;
p = find_spec (cclp, NULL);
if (p && KIND != CCL_TOK_EOL)
return p;
}
-/*
+/**
* ccl_find: Parse CCL find - token representation
* bibset: Bibset to be used for the parsing
* list: List of tokens
return p;
}
-/*
+/**
* ccl_find_str: Parse CCL find - string representation
* bibset: Bibset to be used for the parsing
* str: String to be parsed
ccl_token_del (list);
return p;
}
+/*
+ * Local variables:
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ * vim: shiftwidth=4 tabstop=8 expandtab
+ */
+
projects / yaz-moved-to-github.git / blobdiff