src/sortspec.c

   1 /* This file is part of the YAZ toolkit.
   2  * Copyright (C) 1995-2011 Index Data
   3  * See the file LICENSE for details.
   4  */
   5 /**
   6  * \file sortspec.c
   7  * \brief Implements SortSpec parsing.
   8  */
   9 #if HAVE_CONFIG_H
  10 #include <config.h>
  11 #endif
  12
  13 #include <stdio.h>
  14 #include <string.h>
  15 #include <stdlib.h>
  16
  17 #include <yaz/proto.h>
  18 #include <yaz/sortspec.h>
  19 #include <yaz/oid_db.h>
  20
  21 Z_SortKeySpecList *yaz_sort_spec (ODR out, const char *arg)
  22 {
  23     char sort_string_buf[64], sort_flags[64];
  24     Z_SortKeySpecList *sksl = (Z_SortKeySpecList *)
  25         odr_malloc (out, sizeof(*sksl));
  26     int off;
  27
  28     sksl->num_specs = 0;
  29     sksl->specs = (Z_SortKeySpec **)odr_malloc (out, sizeof(sksl->specs) * 20);
  30
  31     while ((sscanf (arg, "%63s %63s%n", sort_string_buf,
  32                     sort_flags, &off)) == 2  && off > 1)
  33     {
  34         int i;
  35         char *sort_string_sep;
  36         char *sort_string = sort_string_buf;
  37         Z_SortKeySpec *sks = (Z_SortKeySpec *)odr_malloc (out, sizeof(*sks));
  38         Z_SortKey *sk = (Z_SortKey *)odr_malloc (out, sizeof(*sk));
  39
  40         arg += off;
  41         sksl->specs[sksl->num_specs++] = sks;
  42         sks->sortElement = (Z_SortElement *)
  43             odr_malloc (out, sizeof(*sks->sortElement));
  44         sks->sortElement->which = Z_SortElement_generic;
  45         sks->sortElement->u.generic = sk;
  46
  47         if ((sort_string_sep = strchr (sort_string, '=')))
  48         {
  49             int i = 0;
  50             sk->which = Z_SortKey_sortAttributes;
  51             sk->u.sortAttributes = (Z_SortAttributes *)
  52                 odr_malloc (out, sizeof(*sk->u.sortAttributes));
  53             sk->u.sortAttributes->id = odr_oiddup(out, yaz_oid_attset_bib_1);
  54             sk->u.sortAttributes->list = (Z_AttributeList *)
  55                 odr_malloc (out, sizeof(*sk->u.sortAttributes->list));
  56             sk->u.sortAttributes->list->attributes = (Z_AttributeElement **)
  57                 odr_malloc (out, 10 *
  58                             sizeof(*sk->u.sortAttributes->list->attributes));
  59             while (i < 10 && sort_string && sort_string_sep)
  60             {
  61                 Z_AttributeElement *el = (Z_AttributeElement *)
  62                     odr_malloc (out, sizeof(*el));
  63                 sk->u.sortAttributes->list->attributes[i] = el;
  64                 el->attributeSet = 0;
  65                 el->attributeType = odr_intdup (out, atoi (sort_string));
  66                 el->which = Z_AttributeValue_numeric;
  67                 el->value.numeric =
  68                     odr_intdup (out, atoi (sort_string_sep + 1));
  69                 i++;
  70                 sort_string = strchr(sort_string, ',');
  71                 if (sort_string)
  72                 {
  73                     sort_string++;
  74                     sort_string_sep = strchr (sort_string, '=');
  75                 }
  76             }
  77             sk->u.sortAttributes->list->num_attributes = i;
  78         }
  79         else
  80         {
  81             sk->which = Z_SortKey_sortField;
  82             sk->u.sortField = odr_strdup (out, sort_string);
  83         }
  84         sks->sortRelation = odr_intdup (out, Z_SortKeySpec_ascending);
  85         sks->caseSensitivity = odr_intdup (out, Z_SortKeySpec_caseSensitive);
  86
  87         sks->which = Z_SortKeySpec_null;
  88         sks->u.null = odr_nullval ();
  89
  90         for (i = 0; sort_flags[i]; i++)
  91         {
  92             switch (sort_flags[i])
  93             {
  94             case 'd':
  95             case 'D':
  96             case '>':
  97                 *sks->sortRelation = Z_SortKeySpec_descending;
  98                 break;
  99             case 'a':
 100             case 'A':
 101             case '<':
 102                 *sks->sortRelation = Z_SortKeySpec_ascending;
 103                 break;
 104             case 'i':
 105             case 'I':
 106                 *sks->caseSensitivity = Z_SortKeySpec_caseInsensitive;
 107                 break;
 108             case 'S':
 109             case 's':
 110                 *sks->caseSensitivity = Z_SortKeySpec_caseSensitive;
 111                 break;
 112             case '!':
 113                 sks->which = Z_SortKeySpec_abort;
 114                 sks->u.abort = odr_nullval();
 115                 break;
 116             case '=':
 117                 sks->which = Z_SortKeySpec_missingValueData;
 118                 sks->u.missingValueData = (Odr_oct*)
 119                     odr_malloc(out, sizeof(Odr_oct));
 120                 i++;
 121                 sks->u.missingValueData->len = strlen(sort_flags+i);
 122                 sks->u.missingValueData->size = sks->u.missingValueData->len;
 123                 sks->u.missingValueData->buf = (unsigned char*)
 124                                           odr_strdup(out, sort_flags+i);
 125                 i += strlen(sort_flags+i);
 126             }
 127         }
 128     }
 129     if (!sksl->num_specs)
 130         return 0;
 131     return sksl;
 132 }
 133 /*
 134  * Local variables:
 135  * c-basic-offset: 4
 136  * c-file-style: "Stroustrup"
 137  * indent-tabs-mode: nil
 138  * End:
 139  * vim: shiftwidth=4 tabstop=8 expandtab
 140  */
 141