/* This file is part of the YAZ toolkit.
- * Copyright (C) 1995-2008 Index Data
+ * Copyright (C) 1995-2009 Index Data
* See the file LICENSE for details.
*/
* \file
* \brief Implements RPN to CQL conversion
*
- * Evaluation order of rules:
- *
- * always
- * relation
- * structure
- * position
- * truncation
- * index
- * relationModifier
*/
#include <assert.h>
#include <yaz/z-core.h>
#include <yaz/wrbuf.h>
+static const char *lookup_index_from_string_attr(Z_AttributeList *attributes)
+{
+ int j;
+ int server_choice = 1;
+ for (j = 0; j < attributes->num_attributes; j++)
+ {
+ Z_AttributeElement *ae = attributes->attributes[j];
+ if (*ae->attributeType == 1) /* use attribute */
+ {
+ if (ae->which == Z_AttributeValue_complex)
+ {
+ Z_ComplexAttribute *ca = ae->value.complex;
+ int i;
+ for (i = 0; i < ca->num_list; i++)
+ {
+ Z_StringOrNumeric *son = ca->list[i];
+ if (son->which == Z_StringOrNumeric_string)
+ return son->u.string;
+ }
+ }
+ server_choice = 0; /* not serverChoice because we have use attr */
+ }
+ }
+ if (server_choice)
+ return "cql.serverChoice";
+ return 0;
+}
+
+static const char *lookup_relation_index_from_attr(Z_AttributeList *attributes)
+{
+ int j;
+ int server_choice = 1;
+ for (j = 0; j < attributes->num_attributes; j++)
+ {
+ Z_AttributeElement *ae = attributes->attributes[j];
+ if (*ae->attributeType == 2) /* relation attribute */
+ {
+ if (ae->which == Z_AttributeValue_numeric)
+ {
+ /* Only support for numeric relation */
+ Odr_int *relation = ae->value.numeric;
+ /* map this numeric to represetation in cql */
+ switch (*relation) {
+ /* Unsure on whether this is the relation attribute
+ const? */
+ case Z_ProximityOperator_Prox_lessThan:
+ return "<";
+ case Z_ProximityOperator_Prox_lessThanOrEqual:
+ return "<=";
+ case Z_ProximityOperator_Prox_equal:
+ return "=";
+ case Z_ProximityOperator_Prox_greaterThanOrEqual:
+ return ">=";
+ case Z_ProximityOperator_Prox_greaterThan:
+ return ">";
+ case Z_ProximityOperator_Prox_notEqual:
+ return "<>";
+
+ case 100:
+ /* phonetic is not supported in CQL */
+ return 0;
+
+ case 101:
+ /* stem is not supported in CQL */
+ return 0;
+
+ case 102:
+ /* relevance is not supported in CQL ?*/
+ return 0;
+ otherwise:
+ /* Invalid relation */
+ return 0;
+ }
+
+ }
+ else {
+ /* Can we have a complex relation value?
+ Should we implement something?
+ */
+ }
+
+ server_choice = 0; /* Which ServerChoice if relation? */
+ }
+ }
+ if (server_choice)
+ return "cql.serverChoice";
+ return 0;
+}
+
+static int rpn2cql_attr(cql_transform_t ct,
+ Z_AttributeList *attributes, WRBUF w)
+{
+ const char *relation = cql_lookup_reverse(ct, "relation.", attributes);
+ const char *index = cql_lookup_reverse(ct, "index.", attributes);
+ const char *structure = cql_lookup_reverse(ct, "structure.", attributes);
+
+ /* if transform (properties) do not match, we'll just use a USE
+ string attribute (bug #2978) */
+ if (!index)
+ index = lookup_index_from_string_attr(attributes);
+
+ /* Attempt to fix bug #2978): Look for a relation attribute */
+ if (!relation)
+ relation = lookup_relation_index_from_attr(attributes);
+
+ if (!index)
+ {
+ cql_transform_set_error(ct,
+ YAZ_BIB1_UNSUPP_USE_ATTRIBUTE, 0);
+ return -1;
+ }
+ /* for serverChoice we omit index+relation+structure */
+ if (strcmp(index, "cql.serverChoice"))
+ {
+ wrbuf_puts(w, index);
+ if (relation)
+ {
+ if (!strcmp(relation, "exact"))
+ relation = "==";
+ else if (!strcmp(relation, "eq"))
+ relation = "=";
+ else if (!strcmp(relation, "le"))
+ relation = "<=";
+ else if (!strcmp(relation, "ge"))
+ relation = ">=";
+ /* Missing mapping of not equal, phonetic, stem and relevance */
+ wrbuf_puts(w, relation);
+ }
+ else
+ wrbuf_puts(w, "=");
+
+ if (structure)
+ {
+ if (strcmp(structure, "*"))
+ {
+ wrbuf_puts(w, "/");
+ wrbuf_puts(w, structure);
+ wrbuf_puts(w, " ");
+ }
+ }
+ }
+ return 0;
+}
+
static int rpn2cql_simple(cql_transform_t ct,
void (*pr)(const char *buf, void *client_data),
void *client_data,
- Z_Operand *q)
+ Z_Operand *q, WRBUF w)
{
int ret = 0;
if (q->which != Z_Operand_APT)
{
Z_AttributesPlusTerm *apt = q->u.attributesPlusTerm;
Z_Term *term = apt->term;
- Z_AttributeList *attributes = apt->attributes;
- WRBUF w = wrbuf_alloc();
+ const char *sterm = 0;
+ size_t lterm = 0;
+
+ wrbuf_rewind(w);
+ ret = rpn2cql_attr(ct, apt->attributes, w);
switch(term->which)
{
case Z_Term_general:
- wrbuf_write(w, (const char *) term->u.general->buf, term->u.general->len);
+ lterm = term->u.general->len;
+ sterm = (const char *) term->u.general->buf;
break;
case Z_Term_numeric:
- wrbuf_printf(w, "%d", *term->u.numeric);
+ wrbuf_printf(w, ODR_INT_PRINTF, *term->u.numeric);
break;
case Z_Term_characterString:
- wrbuf_puts(w, term->u.characterString);
+ sterm = term->u.characterString;
+ lterm = strlen(sterm);
break;
default:
ret = -1;
cql_transform_set_error(ct, YAZ_BIB1_TERM_TYPE_UNSUPP, 0);
}
+
+ if (term)
+ {
+ size_t i;
+ int must_quote = 0;
+ for (i = 0 ; i < lterm; i++)
+ if (sterm[i] == ' ')
+ must_quote = 1;
+ if (must_quote)
+ wrbuf_puts(w, "\"");
+ wrbuf_write(w, sterm, lterm);
+ if (must_quote)
+ wrbuf_puts(w, "\"");
+ }
if (ret == 0)
pr(wrbuf_cstr(w), client_data);
- wrbuf_destroy(w);
}
return ret;
}
static int rpn2cql_structure(cql_transform_t ct,
void (*pr)(const char *buf, void *client_data),
void *client_data,
- Z_RPNStructure *q, int nested)
+ Z_RPNStructure *q, int nested,
+ WRBUF w)
{
if (q->which == Z_RPNStructure_simple)
- return rpn2cql_simple(ct, pr, client_data, q->u.simple);
+ return rpn2cql_simple(ct, pr, client_data, q->u.simple, w);
else
{
Z_Operator *op = q->u.complex->roperator;
if (nested)
pr("(", client_data);
- r = rpn2cql_structure(ct, pr, client_data, q->u.complex->s1, 1);
+ r = rpn2cql_structure(ct, pr, client_data, q->u.complex->s1, 1, w);
if (r)
return r;
switch(op->which)
cql_transform_set_error(ct, YAZ_BIB1_UNSUPP_SEARCH, 0);
return -1;
}
- r = rpn2cql_structure(ct, pr, client_data, q->u.complex->s2, 1);
+ r = rpn2cql_structure(ct, pr, client_data, q->u.complex->s2, 1, w);
if (nested)
pr(")", client_data);
return r;
}
}
-int cql_transform_rpn2cql(cql_transform_t ct,
- void (*pr)(const char *buf, void *client_data),
- void *client_data,
- Z_RPNQuery *q)
+int cql_transform_rpn2cql_stream(cql_transform_t ct,
+ void (*pr)(const char *buf, void *client_data),
+ void *client_data,
+ Z_RPNQuery *q)
{
+ int r;
+ WRBUF w = wrbuf_alloc();
cql_transform_set_error(ct, 0, 0);
- return rpn2cql_structure(ct, pr, client_data, q->RPNStructure, 0);
+ r = rpn2cql_structure(ct, pr, client_data, q->RPNStructure, 0, w);
+ wrbuf_destroy(w);
+ return r;
}
+int cql_transform_rpn2cql_wrbuf(cql_transform_t ct,
+ WRBUF w,
+ Z_RPNQuery *q)
+{
+ return cql_transform_rpn2cql_stream(ct, wrbuf_vputs, w, q);
+}
+
/*
* Local variables:
* c-basic-offset: 4
+ * c-file-style: "Stroustrup"
* indent-tabs-mode: nil
* End:
* vim: shiftwidth=4 tabstop=8 expandtab
projects / yaz-moved-to-github.git / blobdiff