pquery.c

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/* This file is part of the YAZ toolkit.
 * Copyright (C) Index Data
 * See the file LICENSE for details.
 */
#if HAVE_CONFIG_H
#include <config.h>
#endif
 
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
 
#include <yaz/proto.h>
#include <yaz/oid_db.h>
#include <yaz/pquery.h>
 
struct yaz_pqf_parser {
    const char *query_buf;
    const char *query_ptr;
    const char *lex_buf;
    size_t lex_len;
    int query_look;
    char *left_sep;
    char *right_sep;
    int escape_char;
    int term_type;
    int external_type;
    int error;
};
 
static Z_RPNStructure *rpn_structure(struct yaz_pqf_parser *li, ODR o,
                                     int num_attr, int max_attr,
                                     Odr_int *attr_list, char **attr_clist,
                                     Odr_oid **attr_set);
 
static Odr_oid *query_oid_getvalbyname(struct yaz_pqf_parser *li, ODR o)
{
    char buf[32];
 
    if (li->lex_len >= sizeof(buf)-1)
        return 0;
    memcpy(buf, li->lex_buf, li->lex_len);
    buf[li->lex_len] = '\0';
    return yaz_string_to_oid_odr(yaz_oid_std(), CLASS_ATTSET, buf, o);
}
 
static int compare_term(struct yaz_pqf_parser *li, const char *src,
                        size_t off)
{
    size_t len=strlen(src);
 
    if (li->lex_len == len+off && !memcmp(li->lex_buf+off, src, len-off))
        return 1;
    return 0;
}
 
static int query_token(struct yaz_pqf_parser *li)
{
    int sep_char = ' ';
    const char *sep_match;
    const char **qptr = &li->query_ptr;
 
    while (**qptr == ' ')
        (*qptr)++;
    if (**qptr == '\0')
        return 0;
    li->lex_len = 0;
    if ((sep_match = strchr(li->left_sep, **qptr)))
    {
        sep_char = li->right_sep[sep_match - li->left_sep];
        ++(*qptr);
    }
    li->lex_buf = *qptr;
 
    if (**qptr == li->escape_char && yaz_isdigit((*qptr)[1]))
    {
        ++(li->lex_len);
        ++(*qptr);
        return 'l';
    }
    while (**qptr && **qptr != sep_char)
    {
        if (**qptr == '\\' && (*qptr)[1])
        {
            ++(li->lex_len);
            ++(*qptr);
        }
        ++(li->lex_len);
        ++(*qptr);
    }
    if (**qptr)
        ++(*qptr);
    if (sep_char == ' ' &&
        li->lex_len >= 1 && li->lex_buf[0] == li->escape_char)
    {
        if (compare_term(li, "and", 1))
            return 'a';
        if (compare_term(li, "or", 1))
            return 'o';
        if (compare_term(li, "not", 1))
            return 'n';
        if (compare_term(li, "attr", 1))
            return 'l';
        if (compare_term(li, "set", 1))
            return 's';
        if (compare_term(li, "attrset", 1))
            return 'r';
        if (compare_term(li, "prox", 1))
            return 'p';
        if (compare_term(li, "term", 1))
            return 'y';
    }
    return 't';
}
 
static int lex(struct yaz_pqf_parser *li)
{
    return li->query_look = query_token(li);
}
 
static int escape_string(char *out_buf, const char *in, int len)
{
 
    char *out = out_buf;
    while (--len >= 0)
        if (*in == '\\' && len > 0)
        {
            --len;
            switch (*++in)
            {
            case 't':
                *out++ = '\t';
                break;
            case 'n':
                *out++ = '\n';
                break;
            case 'r':
                *out++ = '\r';
                break;
            case 'f':
                *out++ = '\f';
                break;
            case 'x':
                if (len > 1)
                {
                    char s[4];
                    int n = 0;
                    s[0] = *++in;
                    s[1] = *++in;
                    s[2] = '\0';
                    len = len - 2;
                    sscanf(s, "%x", &n);
                    *out++ = n;
                }
                break;
            case '0':
            case '1':
            case '2':
            case '3':
                if (len > 1)
                {
                    char s[4];
                    int n = 0;
                    s[0] = *in;
                    s[1] = *++in;
                    s[2] = *++in;
                    s[3] = '\0';
                    len = len - 2;
                    sscanf(s, "%o", &n);
                    *out++ = n;
                }
                break;
            default:
                *out++ = *in;
                break;
            }
            in++;
        }
        else
            *out++ = *in++;
    return out - out_buf;
}
 
static int p_query_parse_attr(struct yaz_pqf_parser *li, ODR o,
                              int num_attr, Odr_int *attr_list,
                              char **attr_clist, Odr_oid **attr_set)
{
    const char *cp;
    size_t i;
 
    if (!(cp = strchr(li->lex_buf, '=')) ||
        (size_t) (cp-li->lex_buf) > li->lex_len)
    {
        attr_set[num_attr] = query_oid_getvalbyname(li, o);
        if (attr_set[num_attr] == 0)
        {
            li->error = YAZ_PQF_ERROR_ATTSET;
            return 0;
        }
        if (!lex(li))
        {
            li->error = YAZ_PQF_ERROR_MISSING;
            return 0;
        }
        if (!(cp = strchr(li->lex_buf, '=')))
        {
            li->error = YAZ_PQF_ERROR_BADATTR;
            return 0;
        }
    }
    else
    {
        if (num_attr > 0)
            attr_set[num_attr] = attr_set[num_attr-1];
        else
            attr_set[num_attr] = 0;
    }
    if (*li->lex_buf < '0' || *li->lex_buf > '9')
    {
        li->error = YAZ_PQF_ERROR_BAD_INTEGER;
        return 0;
    }
    attr_list[2*num_attr] = odr_atoi(li->lex_buf);
    cp++;
 
    /* inspect value .. and make it a integer if it appears to be */
    for (i = cp - li->lex_buf; i < li->lex_len; i++)
        if (li->lex_buf[i] < '0' || li->lex_buf[i] > '9')
        {
            int len = li->lex_len - (cp - li->lex_buf);
            attr_list[2*num_attr+1] = 0;
            attr_clist[num_attr] = (char *) odr_malloc(o, len+1);
            len = escape_string(attr_clist[num_attr], cp, len);
            attr_clist[num_attr][len] = '\0';
            return 1;
        }
    attr_list[2*num_attr+1] = odr_atoi(cp);
    attr_clist[num_attr] = 0;
    return 1;
}
 
static Z_AttributeList *get_attributeList(ODR o,
                                          int num_attr, Odr_int *attr_list,
                                          char **attr_clist, Odr_oid **attr_set)
{
    int i, k = 0;
    Odr_int *attr_tmp;
    Z_AttributeElement **elements;
    Z_AttributeList *attributes= (Z_AttributeList *)
        odr_malloc(o, sizeof(*attributes));
    attributes->num_attributes = num_attr;
    if (!num_attr)
    {
        attributes->attributes = (Z_AttributeElement**)odr_nullval();
        return attributes;
    }
    elements = (Z_AttributeElement**)
        odr_malloc(o, num_attr * sizeof(*elements));
 
    attr_tmp = (Odr_int *)odr_malloc(o, num_attr * 2 * sizeof(*attr_tmp));
    memcpy(attr_tmp, attr_list, num_attr * 2 * sizeof(*attr_tmp));
    for (i = num_attr; --i >= 0; )
    {
        int j;
        for (j = i+1; j<num_attr; j++)
            if (attr_tmp[2*j] == attr_tmp[2*i])
                break;
        if (j < num_attr)
            continue;
        elements[k] =
            (Z_AttributeElement*)odr_malloc(o,sizeof(**elements));
        elements[k]->attributeType = &attr_tmp[2*i];
        elements[k]->attributeSet = attr_set[i];
 
        if (attr_clist[i])
        {
            elements[k]->which = Z_AttributeValue_complex;
            elements[k]->value.complex = (Z_ComplexAttribute *)
                odr_malloc(o, sizeof(Z_ComplexAttribute));
            elements[k]->value.complex->num_list = 1;
            elements[k]->value.complex->list =
                (Z_StringOrNumeric **)
                odr_malloc(o, 1 * sizeof(Z_StringOrNumeric *));
            elements[k]->value.complex->list[0] =
                (Z_StringOrNumeric *)
                odr_malloc(o, sizeof(Z_StringOrNumeric));
            elements[k]->value.complex->list[0]->which =
                Z_StringOrNumeric_string;
            elements[k]->value.complex->list[0]->u.string =
                attr_clist[i];
            elements[k]->value.complex->semanticAction = 0;
            elements[k]->value.complex->num_semanticAction = 0;
        }
        else
        {
            elements[k]->which = Z_AttributeValue_numeric;
            elements[k]->value.numeric = &attr_tmp[2*i+1];
        }
        k++;
    }
    attributes->num_attributes = k;
    attributes->attributes = elements;
    return attributes;
}
 
Z_AttributeList *zget_AttributeList_use_string(ODR o, const char *name)
{
    Odr_int attr_list[2];
    char *attr_clist[1];
    Odr_oid *attr_set[1];
 
    attr_list[0] = 1;
    attr_list[1] = 0; /* not used */
    attr_clist[0] = odr_strdup(o, name);
    attr_set[0] = 0;
    return get_attributeList(o, 1, attr_list, attr_clist, attr_set);
}
 
Z_Term *z_Term_create(ODR o, int term_type, const char *buf, size_t len)
{
    Z_Term *term = (Z_Term *)odr_malloc(o, sizeof(*term));
    switch (term_type)
    {
    case Z_Term_general:
        term->which = Z_Term_general;
        term->u.general = odr_create_Odr_oct(o, buf, len);
        break;
    case Z_Term_characterString:
        term->which = Z_Term_characterString;
        term->u.characterString = odr_strdupn(o, buf, len);
        break;
    case Z_Term_numeric:
        term->which = Z_Term_numeric;
        term->u.numeric = odr_intdup(o, odr_atoi(odr_strdupn(o, buf, len)));
        break;
    case Z_Term_null:
        term->which = Z_Term_null;
        term->u.null = odr_nullval();
        break;
    case Z_Term_external:
        term->which = Z_Term_external;
        term->u.external = 0;
        break;
    default:
        term->which = Z_Term_null;
        term->u.null = odr_nullval();
        break;
    }
    return term;
}
 
static Z_AttributesPlusTerm *rpn_term_attributes(
    struct yaz_pqf_parser *li, ODR o, Z_AttributeList *attributes)
{
    char *es_str = odr_malloc(o, li->lex_len+1);
    int es_len = escape_string(es_str, li->lex_buf, li->lex_len);
    Z_Term *term = z_Term_create(o, li->term_type, es_str, es_len);
    Z_AttributesPlusTerm *zapt = (Z_AttributesPlusTerm *)
        odr_malloc(o, sizeof(*zapt));
 
    zapt->term = term;
    zapt->attributes = attributes;
    return zapt;
}
 
static Z_AttributesPlusTerm *rpn_term(struct yaz_pqf_parser *li, ODR o,
                                      int num_attr, Odr_int *attr_list,
                                      char **attr_clist, Odr_oid **attr_set)
{
    return rpn_term_attributes(li, o, get_attributeList(o, num_attr, attr_list, attr_clist, attr_set));
}
 
static Z_Operand *rpn_simple(struct yaz_pqf_parser *li, ODR o,
                             int num_attr, Odr_int *attr_list,
                             char **attr_clist,
                             Odr_oid **attr_set)
{
    Z_Operand *zo;
 
    zo = (Z_Operand *)odr_malloc(o, sizeof(*zo));
    switch (li->query_look)
    {
    case 't':
        zo->which = Z_Operand_APT;
        if (!(zo->u.attributesPlusTerm =
              rpn_term(li, o, num_attr, attr_list, attr_clist, attr_set)))
            return 0;
        lex(li);
        break;
    case 's':
        lex(li);
        if (!li->query_look)
        {
            li->error = YAZ_PQF_ERROR_MISSING;
            return 0;
        }
        zo->which = Z_Operand_resultSetId;
        zo->u.resultSetId = odr_strdupn(o, li->lex_buf, li->lex_len);
        lex(li);
        break;
    default:
        /* we're only called if one of the above types are seens so
           this shouldn't happen */
        li->error = YAZ_PQF_ERROR_INTERNAL;
        return 0;
    }
    return zo;
}
 
static Z_ProximityOperator *rpn_proximity(struct yaz_pqf_parser *li, ODR o)
{
    Z_ProximityOperator *p = (Z_ProximityOperator *)odr_malloc(o, sizeof(*p));
 
    if (!lex(li))
    {
        li->error = YAZ_PQF_ERROR_MISSING;
        return NULL;
    }
    if (*li->lex_buf == '1')
        p->exclusion = odr_booldup(o, 1);
    else if (*li->lex_buf == '0')
        p->exclusion = odr_booldup(o, 0);
    else if (*li->lex_buf == 'v' || *li->lex_buf == 'n')
        p->exclusion = NULL;
    else
    {
        li->error = YAZ_PQF_ERROR_PROXIMITY;
        return NULL;
    }
 
    if (!lex(li))
    {
        li->error = YAZ_PQF_ERROR_MISSING;
        return NULL;
    }
    if (*li->lex_buf >= '0' && *li->lex_buf <= '9')
        p->distance = odr_intdup(o, odr_atoi(li->lex_buf));
    else
    {
        li->error = YAZ_PQF_ERROR_BAD_INTEGER;
        return NULL;
    }
 
    if (!lex(li))
    {
        li->error = YAZ_PQF_ERROR_MISSING;
        return NULL;
    }
    if (*li->lex_buf == '1')
        p->ordered = odr_booldup(o, 1);
    else if (*li->lex_buf == '0')
        p->ordered = odr_booldup(o, 0);
    else
    {
        li->error = YAZ_PQF_ERROR_PROXIMITY;
        return NULL;
    }
 
    if (!lex (li))
    {
        li->error = YAZ_PQF_ERROR_MISSING;
        return NULL;
    }
    if (*li->lex_buf >= '0' && *li->lex_buf <= '9')
        p->relationType = odr_intdup(o, odr_atoi(li->lex_buf));
    else
    {
        li->error = YAZ_PQF_ERROR_BAD_INTEGER;
        return NULL;
    }
 
    if (!lex(li))
    {
        li->error = YAZ_PQF_ERROR_MISSING;
        return NULL;
    }
    if (*li->lex_buf == 'k')
        p->which = Z_ProximityOperator_known;
    else if (*li->lex_buf == 'p')
        p->which = Z_ProximityOperator_private;
    else
        p->which = atoi(li->lex_buf);
 
    if (p->which != Z_ProximityOperator_known
        && p->which != Z_ProximityOperator_private)
    {
        li->error = YAZ_PQF_ERROR_PROXIMITY;
        return NULL;
    }
 
    if (!lex(li))
    {
        li->error = YAZ_PQF_ERROR_MISSING;
        return NULL;
    }
    if (*li->lex_buf >= '0' && *li->lex_buf <= '9')
        p->u.known = odr_intdup(o, odr_atoi(li->lex_buf));
    else
    {
        li->error = YAZ_PQF_ERROR_BAD_INTEGER;
        return NULL;
    }
    return p;
}
 
static Z_Complex *rpn_complex(struct yaz_pqf_parser *li, ODR o,
                              int num_attr, int max_attr,
                              Odr_int *attr_list, char **attr_clist,
                              Odr_oid **attr_set)
{
    Z_Complex *zc;
    Z_Operator *zo;
 
    zc = (Z_Complex *)odr_malloc(o, sizeof(*zc));
    zo = (Z_Operator *)odr_malloc(o, sizeof(*zo));
    zc->roperator = zo;
    switch (li->query_look)
    {
    case 'a':
        zo->which = Z_Operator_and;
        zo->u.op_and = odr_nullval();
        break;
    case 'o':
        zo->which = Z_Operator_or;
        zo->u.op_or = odr_nullval();
        break;
    case 'n':
        zo->which = Z_Operator_and_not;
        zo->u.and_not = odr_nullval();
        break;
    case 'p':
        zo->which = Z_Operator_prox;
        zo->u.prox = rpn_proximity(li, o);
        if (!zo->u.prox)
            return NULL;
        break;
    default:
        /* we're only called if one of the above types are seens so
           this shouldn't happen */
        li->error = YAZ_PQF_ERROR_INTERNAL;
        return NULL;
    }
    lex(li);
    if (!(zc->s1 =
          rpn_structure(li, o, num_attr, max_attr, attr_list,
                        attr_clist, attr_set)))
        return NULL;
    if (!(zc->s2 =
          rpn_structure(li, o, num_attr, max_attr, attr_list,
                        attr_clist, attr_set)))
        return NULL;
    return zc;
}
 
static void rpn_term_type(struct yaz_pqf_parser *li)
{
    if (!li->query_look)
        return ;
    if (compare_term(li, "general", 0))
        li->term_type = Z_Term_general;
    else if (compare_term(li, "numeric", 0))
        li->term_type = Z_Term_numeric;
    else if (compare_term(li, "string", 0))
        li->term_type = Z_Term_characterString;
    else if (compare_term(li, "oid", 0))
        li->term_type = Z_Term_oid;
    else if (compare_term(li, "datetime", 0))
        li->term_type = Z_Term_dateTime;
    else if (compare_term(li, "null", 0))
        li->term_type = Z_Term_null;
#if 0
    else if (compare_term(li, "range", 0))
    {
        /* prepare for external: range search .. */
        li->term_type = Z_Term_external;
        li->external_type = VAL_MULTISRCH2;
    }
#endif
    lex(li);
}
 
static Z_RPNStructure *rpn_structure(struct yaz_pqf_parser *li, ODR o,
                                     int num_attr, int max_attr,
                                     Odr_int *attr_list,
                                     char **attr_clist,
                                     Odr_oid **attr_set)
{
    Z_RPNStructure *sz;
 
    sz = (Z_RPNStructure *)odr_malloc(o, sizeof(*sz));
    switch (li->query_look)
    {
    case 'a':
    case 'o':
    case 'n':
    case 'p':
        sz->which = Z_RPNStructure_complex;
        if (!(sz->u.complex =
              rpn_complex(li, o, num_attr, max_attr, attr_list,
                          attr_clist, attr_set)))
            return NULL;
        break;
    case 't':
    case 's':
        sz->which = Z_RPNStructure_simple;
        if (!(sz->u.simple =
              rpn_simple(li, o, num_attr, attr_list,
                         attr_clist, attr_set)))
            return NULL;
        break;
    case 'l':
        lex(li);
        if (!li->query_look)
        {
            li->error = YAZ_PQF_ERROR_MISSING;
            return 0;
        }
        if (num_attr >= max_attr)
        {
            li->error = YAZ_PQF_ERROR_TOOMANY;
            return 0;
        }
        if (!p_query_parse_attr(li, o, num_attr, attr_list,
                                attr_clist, attr_set))
            return 0;
        num_attr++;
        lex(li);
        return
            rpn_structure(li, o, num_attr, max_attr, attr_list,
                          attr_clist,  attr_set);
    case 'y':
        lex(li);
        rpn_term_type(li);
        return
            rpn_structure(li, o, num_attr, max_attr, attr_list,
                          attr_clist, attr_set);
    case 0:                /* operator/operand expected! */
        li->error = YAZ_PQF_ERROR_MISSING;
        return 0;
    }
    return sz;
}
 
static Z_RPNQuery *p_query_rpn_mk(ODR o, struct yaz_pqf_parser *li)
{
    Z_RPNQuery *zq;
    Odr_int attr_array[1024];
    char *attr_clist[512];
    Odr_oid *attr_set[512];
    Odr_oid *top_set = 0;
 
    zq = (Z_RPNQuery *)odr_malloc(o, sizeof(*zq));
    lex(li);
    if (li->query_look == 'r')
    {
        lex(li);
        top_set = query_oid_getvalbyname(li, o);
        if (!top_set)
        {
            li->error = YAZ_PQF_ERROR_ATTSET;
            return NULL;
        }
        lex(li);
    }
    if (!top_set)
    {
        top_set = odr_oiddup(o, yaz_oid_attset_bib_1);
    }
 
    zq->attributeSetId = top_set;
 
    if (!zq->attributeSetId)
    {
        li->error = YAZ_PQF_ERROR_ATTSET;
        return 0;
    }
 
    if (!(zq->RPNStructure = rpn_structure(li, o, 0, 512,
                                           attr_array, attr_clist, attr_set)))
        return 0;
    if (li->query_look)
    {
        li->error = YAZ_PQF_ERROR_EXTRA;
        return 0;
    }
    return zq;
}
 
static void pqf_parser_begin(struct yaz_pqf_parser *li, const char *buf)
{
    li->query_buf = li->query_ptr = buf;
    li->lex_buf = 0;
}
 
Z_RPNQuery *p_query_rpn(ODR o, const char *qbuf)
{
    struct yaz_pqf_parser li;
 
    li.error = 0;
    li.left_sep = "{\"";
    li.right_sep = "}\"";
    li.escape_char = '@';
    li.term_type = Z_Term_general;
 
    pqf_parser_begin(&li, qbuf);
    return p_query_rpn_mk(o, &li);
}
 
static Z_AttributeList *p_query_scan_attributes_mk(struct yaz_pqf_parser *li,
                                             ODR o,
                                             Odr_oid **attributeSetP)
{
    Odr_int attr_list[1024];
    char *attr_clist[512];
    Odr_oid *attr_set[512];
    int num_attr = 0;
    int max_attr = 512;
    Odr_oid *top_set = 0;
 
    lex(li);
    if (li->query_look == 'r')
    {
        lex(li);
        top_set = query_oid_getvalbyname(li, o);
        if (!top_set)
        {
            li->error = YAZ_PQF_ERROR_ATTSET;
            return NULL;
        }
        lex(li);
    }
    if (!top_set)
    {
        top_set = odr_oiddup(o, yaz_oid_attset_bib_1);
    }
    *attributeSetP = top_set;
 
    while (1)
    {
        if (li->query_look == 'l')
        {
            lex(li);
            if (!li->query_look)
            {
                li->error = YAZ_PQF_ERROR_MISSING;
                return 0;
            }
            if (num_attr >= max_attr)
            {
                li->error = YAZ_PQF_ERROR_TOOMANY;
                return 0;
            }
            if (!p_query_parse_attr(li, o, num_attr, attr_list,
                                    attr_clist, attr_set))
                return 0;
            num_attr++;
            lex(li);
        }
        else if (li->query_look == 'y')
        {
            lex(li);
            rpn_term_type(li);
        }
        else
            break;
    }
    return get_attributeList(o, num_attr, attr_list, attr_clist, attr_set);
}
 
static Z_AttributesPlusTerm *p_query_scan_mk(struct yaz_pqf_parser *li,
                                             ODR o,
                                             Odr_oid **attributeSetP)
{
    Z_AttributeList *attr_list = p_query_scan_attributes_mk(li, o, attributeSetP);
    Z_AttributesPlusTerm *apt;
 
    if (!li->query_look)
    {
        li->error = YAZ_PQF_ERROR_MISSING;
        return 0;
    }
    apt = rpn_term_attributes(li, o, attr_list);
 
    lex(li);
 
    if (li->query_look != 0)
    {
        li->error = YAZ_PQF_ERROR_EXTRA;
        return 0;
    }
    return apt;
}
 
YAZ_PQF_Parser yaz_pqf_create(void)
{
    YAZ_PQF_Parser p = (YAZ_PQF_Parser) xmalloc(sizeof(*p));
 
    p->error = 0;
    p->left_sep = "{\"";
    p->right_sep = "}\"";
    p->escape_char = '@';
    p->term_type = Z_Term_general;
 
    return p;
}
 
void yaz_pqf_destroy(YAZ_PQF_Parser p)
{
    xfree(p);
}
 
Z_RPNQuery *yaz_pqf_parse(YAZ_PQF_Parser p, ODR o, const char *qbuf)
{
    if (!p)
        return 0;
    pqf_parser_begin(p, qbuf);
    return p_query_rpn_mk(o, p);
}
 
Z_AttributesPlusTerm *yaz_pqf_scan(YAZ_PQF_Parser p, ODR o,
                                   Odr_oid **attributeSetP,
                                   const char *qbuf)
{
    if (!p)
        return 0;
    pqf_parser_begin(p, qbuf);
    return p_query_scan_mk(p, o, attributeSetP);
}
 
Z_AttributeList *yaz_pqf_scan_attribute_list(YAZ_PQF_Parser p, ODR o,
                                             Odr_oid **attributeSetP,
                                             const char *qbuf)
{
    if (!p)
        return 0;
    pqf_parser_begin(p, qbuf);
    return p_query_scan_attributes_mk(p, o, attributeSetP);
}
 
static Z_FacetField* parse_facet(ODR odr, const char *facet)
{
    YAZ_PQF_Parser pqf_parser = yaz_pqf_create();
    struct yaz_pqf_parser *li = pqf_parser;
    Odr_oid *attributeSetId = 0;
    Z_FacetField *facet_field = 0;
    Z_AttributeList *attribute_list;
 
    pqf_parser_begin(pqf_parser, facet);
    attribute_list = p_query_scan_attributes_mk(li, odr, &attributeSetId);
    if (attribute_list)
    {
        facet_field = (Z_FacetField *) odr_malloc(odr, sizeof(*facet_field));
        facet_field->attributes = attribute_list;
        facet_field->num_terms = 0;
        facet_field->terms = odr_malloc(odr, 10 * sizeof(*facet_field->terms));
        while (li->query_look == 't')
        {
            if (facet_field->num_terms < 10)
            {
                char *es_str = odr_malloc(odr, li->lex_len+1);
                int es_len = escape_string(es_str, li->lex_buf, li->lex_len);
                Z_Term *term = z_Term_create(odr, li->term_type, es_str, es_len);
 
                facet_field->terms[facet_field->num_terms] =
                    (Z_FacetTerm *) odr_malloc(odr, sizeof(Z_FacetTerm));
                facet_field->terms[facet_field->num_terms]->term = term;
                facet_field->terms[facet_field->num_terms]->count =
                    odr_intdup(odr, 0);
                facet_field->num_terms++;
            }
            lex(li);
        }
    }
    yaz_pqf_destroy(pqf_parser);
    return facet_field;
}
 
Z_FacetList *yaz_pqf_parse_facet_list(ODR o, const char *qbuf)
{
    char **darray;
    int num;
 
    nmem_strsplit(odr_getmem(o), ",", qbuf, &darray, &num);
    if (num > 0)
    {
        int i;
        Z_FacetList *fl = (Z_FacetList*) odr_malloc(o, sizeof(*fl));
        fl->num = num;
        fl->elements = (Z_FacetField **)
            odr_malloc(o, num * sizeof(*fl->elements));
        for (i = 0; i < num; i++)
        {
            fl->elements[i] = parse_facet(o, darray[i]);
            if (!fl->elements[i])
                return 0;
        }
        return fl;
    }
    else
        return 0;
}
 
int yaz_pqf_error(YAZ_PQF_Parser p, const char **msg, size_t *off)
{
    switch (p->error)
    {
    case YAZ_PQF_ERROR_NONE:
        *msg = "no error"; break;
    case YAZ_PQF_ERROR_EXTRA:
        *msg = "extra token"; break;
    case YAZ_PQF_ERROR_MISSING:
        *msg = "missing token"; break;
    case YAZ_PQF_ERROR_ATTSET:
        *msg = "unknown attribute set"; break;
    case YAZ_PQF_ERROR_TOOMANY:
        *msg = "too many attributes"; break;
    case YAZ_PQF_ERROR_BADATTR:
        *msg = "bad attribute specification"; break;
    case YAZ_PQF_ERROR_INTERNAL:
        *msg = "internal error"; break;
    case YAZ_PQF_ERROR_PROXIMITY:
        *msg = "proximity error"; break;
    case YAZ_PQF_ERROR_BAD_INTEGER:
        *msg = "bad integer"; break;
    default:
        *msg = "unknown error"; break;
    }
    *off = p->query_ptr - p->query_buf;
    return p->error;
}
/*
 * Local variables:
 * c-basic-offset: 4
 * c-file-style: "Stroustrup"
 * indent-tabs-mode: nil
 * End:
 * vim: shiftwidth=4 tabstop=8 expandtab
 */