YAZ  4.2.57
pquery.c
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1 /* This file is part of the YAZ toolkit.
2  * Copyright (C) 1995-2013 Index Data
3  * See the file LICENSE for details.
4  */
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/oid_db.h>
19 #include <yaz/pquery.h>
20 
21 struct yaz_pqf_parser {
22  const char *query_buf;
23  const char *query_ptr;
24  const char *lex_buf;
25  size_t lex_len;
26  int query_look;
27  char *left_sep;
28  char *right_sep;
29  int escape_char;
30  int term_type;
31  int external_type;
32  int error;
33 };
34 
35 static Z_RPNStructure *rpn_structure(struct yaz_pqf_parser *li, ODR o,
36  int num_attr, int max_attr,
37  Odr_int *attr_list, char **attr_clist,
38  Odr_oid **attr_set);
39 
40 static Odr_oid *query_oid_getvalbyname(struct yaz_pqf_parser *li, ODR o)
41 {
42  char buf[32];
43 
44  if (li->lex_len >= sizeof(buf)-1)
45  return 0;
46  memcpy(buf, li->lex_buf, li->lex_len);
47  buf[li->lex_len] = '\0';
48  return yaz_string_to_oid_odr(yaz_oid_std(), CLASS_ATTSET, buf, o);
49 }
50 
51 static int compare_term(struct yaz_pqf_parser *li, const char *src,
52  size_t off)
53 {
54  size_t len=strlen(src);
55 
56  if (li->lex_len == len+off && !memcmp(li->lex_buf+off, src, len-off))
57  return 1;
58  return 0;
59 }
60 
61 static int query_token(struct yaz_pqf_parser *li)
62 {
63  int sep_char = ' ';
64  const char *sep_match;
65  const char **qptr = &li->query_ptr;
66 
67  while (**qptr == ' ')
68  (*qptr)++;
69  if (**qptr == '\0')
70  return 0;
71  li->lex_len = 0;
72  if ((sep_match = strchr(li->left_sep, **qptr)))
73  {
74  sep_char = li->right_sep[sep_match - li->left_sep];
75  ++(*qptr);
76  }
77  li->lex_buf = *qptr;
78 
79  if (**qptr == li->escape_char && yaz_isdigit((*qptr)[1]))
80  {
81  ++(li->lex_len);
82  ++(*qptr);
83  return 'l';
84  }
85  while (**qptr && **qptr != sep_char)
86  {
87  if (**qptr == '\\' && (*qptr)[1])
88  {
89  ++(li->lex_len);
90  ++(*qptr);
91  }
92  ++(li->lex_len);
93  ++(*qptr);
94  }
95  if (**qptr)
96  ++(*qptr);
97  if (sep_char == ' ' &&
98  li->lex_len >= 1 && li->lex_buf[0] == li->escape_char)
99  {
100  if (compare_term(li, "and", 1))
101  return 'a';
102  if (compare_term(li, "or", 1))
103  return 'o';
104  if (compare_term(li, "not", 1))
105  return 'n';
106  if (compare_term(li, "attr", 1))
107  return 'l';
108  if (compare_term(li, "set", 1))
109  return 's';
110  if (compare_term(li, "attrset", 1))
111  return 'r';
112  if (compare_term(li, "prox", 1))
113  return 'p';
114  if (compare_term(li, "term", 1))
115  return 'y';
116  }
117  return 't';
118 }
119 
120 static int lex(struct yaz_pqf_parser *li)
121 {
122  return li->query_look = query_token(li);
123 }
124 
125 static int escape_string(char *out_buf, const char *in, int len)
126 {
127 
128  char *out = out_buf;
129  while (--len >= 0)
130  if (*in == '\\' && len > 0)
131  {
132  --len;
133  switch (*++in)
134  {
135  case 't':
136  *out++ = '\t';
137  break;
138  case 'n':
139  *out++ = '\n';
140  break;
141  case 'r':
142  *out++ = '\r';
143  break;
144  case 'f':
145  *out++ = '\f';
146  break;
147  case 'x':
148  if (len > 1)
149  {
150  char s[4];
151  int n = 0;
152  s[0] = *++in;
153  s[1] = *++in;
154  s[2] = '\0';
155  len = len - 2;
156  sscanf(s, "%x", &n);
157  *out++ = n;
158  }
159  break;
160  case '0':
161  case '1':
162  case '2':
163  case '3':
164  if (len > 1)
165  {
166  char s[4];
167  int n = 0;
168  s[0] = *in;
169  s[1] = *++in;
170  s[2] = *++in;
171  s[3] = '\0';
172  len = len - 2;
173  sscanf(s, "%o", &n);
174  *out++ = n;
175  }
176  break;
177  default:
178  *out++ = *in;
179  break;
180  }
181  in++;
182  }
183  else
184  *out++ = *in++;
185  return out - out_buf;
186 }
187 
188 static int p_query_parse_attr(struct yaz_pqf_parser *li, ODR o,
189  int num_attr, Odr_int *attr_list,
190  char **attr_clist, Odr_oid **attr_set)
191 {
192  const char *cp;
193  size_t i;
194 
195  if (!(cp = strchr(li->lex_buf, '=')) ||
196  (size_t) (cp-li->lex_buf) > li->lex_len)
197  {
198  attr_set[num_attr] = query_oid_getvalbyname(li, o);
199  if (attr_set[num_attr] == 0)
200  {
201  li->error = YAZ_PQF_ERROR_ATTSET;
202  return 0;
203  }
204  if (!lex(li))
205  {
206  li->error = YAZ_PQF_ERROR_MISSING;
207  return 0;
208  }
209  if (!(cp = strchr(li->lex_buf, '=')))
210  {
211  li->error = YAZ_PQF_ERROR_BADATTR;
212  return 0;
213  }
214  }
215  else
216  {
217  if (num_attr > 0)
218  attr_set[num_attr] = attr_set[num_attr-1];
219  else
220  attr_set[num_attr] = 0;
221  }
222  if (*li->lex_buf < '0' || *li->lex_buf > '9')
223  {
224  li->error = YAZ_PQF_ERROR_BAD_INTEGER;
225  return 0;
226  }
227  attr_list[2*num_attr] = odr_atoi(li->lex_buf);
228  cp++;
229 
230  /* inspect value .. and make it a integer if it appears to be */
231  for (i = cp - li->lex_buf; i < li->lex_len; i++)
232  if (li->lex_buf[i] < '0' || li->lex_buf[i] > '9')
233  {
234  int len = li->lex_len - (cp - li->lex_buf);
235  attr_list[2*num_attr+1] = 0;
236  attr_clist[num_attr] = (char *) odr_malloc(o, len+1);
237  len = escape_string(attr_clist[num_attr], cp, len);
238  attr_clist[num_attr][len] = '\0';
239  return 1;
240  }
241  attr_list[2*num_attr+1] = odr_atoi(cp);
242  attr_clist[num_attr] = 0;
243  return 1;
244 }
245 
246 static Z_AttributeList *get_attributeList(ODR o,
247  int num_attr, Odr_int *attr_list,
248  char **attr_clist, Odr_oid **attr_set)
249 {
250  int i, k = 0;
251  Odr_int *attr_tmp;
252  Z_AttributeElement **elements;
253  Z_AttributeList *attributes= (Z_AttributeList *)
254  odr_malloc(o, sizeof(*attributes));
255  attributes->num_attributes = num_attr;
256  if (!num_attr)
257  {
258  attributes->attributes = (Z_AttributeElement**)odr_nullval();
259  return attributes;
260  }
261  elements = (Z_AttributeElement**)
262  odr_malloc(o, num_attr * sizeof(*elements));
263 
264  attr_tmp = (Odr_int *)odr_malloc(o, num_attr * 2 * sizeof(*attr_tmp));
265  memcpy(attr_tmp, attr_list, num_attr * 2 * sizeof(*attr_tmp));
266  for (i = num_attr; --i >= 0; )
267  {
268  int j;
269  for (j = i+1; j<num_attr; j++)
270  if (attr_tmp[2*j] == attr_tmp[2*i])
271  break;
272  if (j < num_attr)
273  continue;
274  elements[k] =
275  (Z_AttributeElement*)odr_malloc(o,sizeof(**elements));
276  elements[k]->attributeType = &attr_tmp[2*i];
277  elements[k]->attributeSet = attr_set[i];
278 
279  if (attr_clist[i])
280  {
281  elements[k]->which = Z_AttributeValue_complex;
282  elements[k]->value.complex = (Z_ComplexAttribute *)
283  odr_malloc(o, sizeof(Z_ComplexAttribute));
284  elements[k]->value.complex->num_list = 1;
285  elements[k]->value.complex->list =
286  (Z_StringOrNumeric **)
287  odr_malloc(o, 1 * sizeof(Z_StringOrNumeric *));
288  elements[k]->value.complex->list[0] =
289  (Z_StringOrNumeric *)
290  odr_malloc(o, sizeof(Z_StringOrNumeric));
291  elements[k]->value.complex->list[0]->which =
292  Z_StringOrNumeric_string;
293  elements[k]->value.complex->list[0]->u.string =
294  attr_clist[i];
295  elements[k]->value.complex->semanticAction = 0;
296  elements[k]->value.complex->num_semanticAction = 0;
297  }
298  else
299  {
300  elements[k]->which = Z_AttributeValue_numeric;
301  elements[k]->value.numeric = &attr_tmp[2*i+1];
302  }
303  k++;
304  }
305  attributes->num_attributes = k;
306  attributes->attributes = elements;
307  return attributes;
308 }
309 
310 Z_Term *z_Term_create(ODR o, int term_type, const char *buf, size_t len)
311 {
312  Z_Term *term = (Z_Term *)odr_malloc(o, sizeof(*term));
313  Odr_oct *term_octet = (Odr_oct *)odr_malloc(o, sizeof(*term_octet));
314  term_octet->buf = (unsigned char *)odr_malloc(o, 1 + len);
315  memcpy(term_octet->buf, buf, len);
316  term_octet->size = term_octet->len = len;
317  term_octet->buf[term_octet->size] = 0; /* null terminate */
318 
319  switch (term_type)
320  {
321  case Z_Term_general:
322  term->which = Z_Term_general;
323  term->u.general = term_octet;
324  break;
325  case Z_Term_characterString:
326  term->which = Z_Term_characterString;
327  term->u.characterString = (char*) term_octet->buf;
328  /* null terminated above */
329  break;
330  case Z_Term_numeric:
331  term->which = Z_Term_numeric;
332  term->u.numeric = odr_intdup(o, odr_atoi((const char*) term_octet->buf));
333  break;
334  case Z_Term_null:
335  term->which = Z_Term_null;
336  term->u.null = odr_nullval();
337  break;
338  case Z_Term_external:
339  term->which = Z_Term_external;
340  term->u.external = 0;
341  break;
342  default:
343  term->which = Z_Term_null;
344  term->u.null = odr_nullval();
345  break;
346  }
347  return term;
348 }
349 
350 static Z_AttributesPlusTerm *rpn_term_attributes(
351  struct yaz_pqf_parser *li, ODR o, Z_AttributeList *attributes)
352 {
353  char *es_str = odr_malloc(o, li->lex_len+1);
354  int es_len = escape_string(es_str, li->lex_buf, li->lex_len);
355  Z_Term *term = z_Term_create(o, li->term_type, es_str, es_len);
356  Z_AttributesPlusTerm *zapt = (Z_AttributesPlusTerm *)
357  odr_malloc(o, sizeof(*zapt));
358 
359  zapt->term = term;
360  zapt->attributes = attributes;
361  return zapt;
362 }
363 
364 static Z_AttributesPlusTerm *rpn_term(struct yaz_pqf_parser *li, ODR o,
365  int num_attr, Odr_int *attr_list,
366  char **attr_clist, Odr_oid **attr_set)
367 {
368  return rpn_term_attributes(li, o, get_attributeList(o, num_attr, attr_list, attr_clist, attr_set));
369 }
370 
371 static Z_Operand *rpn_simple(struct yaz_pqf_parser *li, ODR o,
372  int num_attr, Odr_int *attr_list,
373  char **attr_clist,
374  Odr_oid **attr_set)
375 {
376  Z_Operand *zo;
377 
378  zo = (Z_Operand *)odr_malloc(o, sizeof(*zo));
379  switch (li->query_look)
380  {
381  case 't':
382  zo->which = Z_Operand_APT;
383  if (!(zo->u.attributesPlusTerm =
384  rpn_term(li, o, num_attr, attr_list, attr_clist, attr_set)))
385  return 0;
386  lex(li);
387  break;
388  case 's':
389  lex(li);
390  if (!li->query_look)
391  {
392  li->error = YAZ_PQF_ERROR_MISSING;
393  return 0;
394  }
395  zo->which = Z_Operand_resultSetId;
396  zo->u.resultSetId = (char *)odr_malloc(o, li->lex_len+1);
397  memcpy(zo->u.resultSetId, li->lex_buf, li->lex_len);
398  zo->u.resultSetId[li->lex_len] = '\0';
399  lex(li);
400  break;
401  default:
402  /* we're only called if one of the above types are seens so
403  this shouldn't happen */
404  li->error = YAZ_PQF_ERROR_INTERNAL;
405  return 0;
406  }
407  return zo;
408 }
409 
410 static Z_ProximityOperator *rpn_proximity(struct yaz_pqf_parser *li, ODR o)
411 {
412  Z_ProximityOperator *p = (Z_ProximityOperator *)odr_malloc(o, sizeof(*p));
413 
414  if (!lex(li))
415  {
416  li->error = YAZ_PQF_ERROR_MISSING;
417  return NULL;
418  }
419  if (*li->lex_buf == '1')
420  p->exclusion = odr_booldup(o, 1);
421  else if (*li->lex_buf == '0')
422  p->exclusion = odr_booldup(o, 0);
423  else if (*li->lex_buf == 'v' || *li->lex_buf == 'n')
424  p->exclusion = NULL;
425  else
426  {
427  li->error = YAZ_PQF_ERROR_PROXIMITY;
428  return NULL;
429  }
430 
431  if (!lex(li))
432  {
433  li->error = YAZ_PQF_ERROR_MISSING;
434  return NULL;
435  }
436  if (*li->lex_buf >= '0' && *li->lex_buf <= '9')
437  p->distance = odr_intdup(o, odr_atoi(li->lex_buf));
438  else
439  {
440  li->error = YAZ_PQF_ERROR_BAD_INTEGER;
441  return NULL;
442  }
443 
444  if (!lex(li))
445  {
446  li->error = YAZ_PQF_ERROR_MISSING;
447  return NULL;
448  }
449  if (*li->lex_buf == '1')
450  p->ordered = odr_booldup(o, 1);
451  else if (*li->lex_buf == '0')
452  p->ordered = odr_booldup(o, 0);
453  else
454  {
455  li->error = YAZ_PQF_ERROR_PROXIMITY;
456  return NULL;
457  }
458 
459  if (!lex (li))
460  {
461  li->error = YAZ_PQF_ERROR_MISSING;
462  return NULL;
463  }
464  if (*li->lex_buf >= '0' && *li->lex_buf <= '9')
465  p->relationType = odr_intdup(o, odr_atoi(li->lex_buf));
466  else
467  {
468  li->error = YAZ_PQF_ERROR_BAD_INTEGER;
469  return NULL;
470  }
471 
472  if (!lex(li))
473  {
474  li->error = YAZ_PQF_ERROR_MISSING;
475  return NULL;
476  }
477  if (*li->lex_buf == 'k')
478  p->which = Z_ProximityOperator_known;
479  else if (*li->lex_buf == 'p')
480  p->which = Z_ProximityOperator_private;
481  else
482  p->which = atoi(li->lex_buf);
483 
484  if (p->which != Z_ProximityOperator_known
485  && p->which != Z_ProximityOperator_private)
486  {
487  li->error = YAZ_PQF_ERROR_PROXIMITY;
488  return NULL;
489  }
490 
491  if (!lex(li))
492  {
493  li->error = YAZ_PQF_ERROR_MISSING;
494  return NULL;
495  }
496  if (*li->lex_buf >= '0' && *li->lex_buf <= '9')
497  p->u.known = odr_intdup(o, odr_atoi(li->lex_buf));
498  else
499  {
500  li->error = YAZ_PQF_ERROR_BAD_INTEGER;
501  return NULL;
502  }
503  return p;
504 }
505 
506 static Z_Complex *rpn_complex(struct yaz_pqf_parser *li, ODR o,
507  int num_attr, int max_attr,
508  Odr_int *attr_list, char **attr_clist,
509  Odr_oid **attr_set)
510 {
511  Z_Complex *zc;
512  Z_Operator *zo;
513 
514  zc = (Z_Complex *)odr_malloc(o, sizeof(*zc));
515  zo = (Z_Operator *)odr_malloc(o, sizeof(*zo));
516  zc->roperator = zo;
517  switch (li->query_look)
518  {
519  case 'a':
520  zo->which = Z_Operator_and;
521  zo->u.op_and = odr_nullval();
522  break;
523  case 'o':
524  zo->which = Z_Operator_or;
525  zo->u.op_or = odr_nullval();
526  break;
527  case 'n':
528  zo->which = Z_Operator_and_not;
529  zo->u.and_not = odr_nullval();
530  break;
531  case 'p':
532  zo->which = Z_Operator_prox;
533  zo->u.prox = rpn_proximity(li, o);
534  if (!zo->u.prox)
535  return NULL;
536  break;
537  default:
538  /* we're only called if one of the above types are seens so
539  this shouldn't happen */
540  li->error = YAZ_PQF_ERROR_INTERNAL;
541  return NULL;
542  }
543  lex(li);
544  if (!(zc->s1 =
545  rpn_structure(li, o, num_attr, max_attr, attr_list,
546  attr_clist, attr_set)))
547  return NULL;
548  if (!(zc->s2 =
549  rpn_structure(li, o, num_attr, max_attr, attr_list,
550  attr_clist, attr_set)))
551  return NULL;
552  return zc;
553 }
554 
555 static void rpn_term_type(struct yaz_pqf_parser *li)
556 {
557  if (!li->query_look)
558  return ;
559  if (compare_term(li, "general", 0))
560  li->term_type = Z_Term_general;
561  else if (compare_term(li, "numeric", 0))
562  li->term_type = Z_Term_numeric;
563  else if (compare_term(li, "string", 0))
564  li->term_type = Z_Term_characterString;
565  else if (compare_term(li, "oid", 0))
566  li->term_type = Z_Term_oid;
567  else if (compare_term(li, "datetime", 0))
568  li->term_type = Z_Term_dateTime;
569  else if (compare_term(li, "null", 0))
570  li->term_type = Z_Term_null;
571 #if 0
572  else if (compare_term(li, "range", 0))
573  {
574  /* prepare for external: range search .. */
575  li->term_type = Z_Term_external;
576  li->external_type = VAL_MULTISRCH2;
577  }
578 #endif
579  lex(li);
580 }
581 
582 static Z_RPNStructure *rpn_structure(struct yaz_pqf_parser *li, ODR o,
583  int num_attr, int max_attr,
584  Odr_int *attr_list,
585  char **attr_clist,
586  Odr_oid **attr_set)
587 {
588  Z_RPNStructure *sz;
589 
590  sz = (Z_RPNStructure *)odr_malloc(o, sizeof(*sz));
591  switch (li->query_look)
592  {
593  case 'a':
594  case 'o':
595  case 'n':
596  case 'p':
597  sz->which = Z_RPNStructure_complex;
598  if (!(sz->u.complex =
599  rpn_complex(li, o, num_attr, max_attr, attr_list,
600  attr_clist, attr_set)))
601  return NULL;
602  break;
603  case 't':
604  case 's':
605  sz->which = Z_RPNStructure_simple;
606  if (!(sz->u.simple =
607  rpn_simple(li, o, num_attr, attr_list,
608  attr_clist, attr_set)))
609  return NULL;
610  break;
611  case 'l':
612  lex(li);
613  if (!li->query_look)
614  {
615  li->error = YAZ_PQF_ERROR_MISSING;
616  return 0;
617  }
618  if (num_attr >= max_attr)
619  {
620  li->error = YAZ_PQF_ERROR_TOOMANY;
621  return 0;
622  }
623  if (!p_query_parse_attr(li, o, num_attr, attr_list,
624  attr_clist, attr_set))
625  return 0;
626  num_attr++;
627  lex(li);
628  return
629  rpn_structure(li, o, num_attr, max_attr, attr_list,
630  attr_clist, attr_set);
631  case 'y':
632  lex(li);
633  rpn_term_type(li);
634  return
635  rpn_structure(li, o, num_attr, max_attr, attr_list,
636  attr_clist, attr_set);
637  case 0: /* operator/operand expected! */
638  li->error = YAZ_PQF_ERROR_MISSING;
639  return 0;
640  }
641  return sz;
642 }
643 
644 static Z_RPNQuery *p_query_rpn_mk(ODR o, struct yaz_pqf_parser *li)
645 {
646  Z_RPNQuery *zq;
647  Odr_int attr_array[1024];
648  char *attr_clist[512];
649  Odr_oid *attr_set[512];
650  Odr_oid *top_set = 0;
651 
652  zq = (Z_RPNQuery *)odr_malloc(o, sizeof(*zq));
653  lex(li);
654  if (li->query_look == 'r')
655  {
656  lex(li);
657  top_set = query_oid_getvalbyname(li, o);
658  if (!top_set)
659  {
660  li->error = YAZ_PQF_ERROR_ATTSET;
661  return NULL;
662  }
663  lex(li);
664  }
665  if (!top_set)
666  {
667  top_set = odr_oiddup(o, yaz_oid_attset_bib_1);
668  }
669 
670  zq->attributeSetId = top_set;
671 
672  if (!zq->attributeSetId)
673  {
674  li->error = YAZ_PQF_ERROR_ATTSET;
675  return 0;
676  }
677 
678  if (!(zq->RPNStructure = rpn_structure(li, o, 0, 512,
679  attr_array, attr_clist, attr_set)))
680  return 0;
681  if (li->query_look)
682  {
683  li->error = YAZ_PQF_ERROR_EXTRA;
684  return 0;
685  }
686  return zq;
687 }
688 
689 static void pqf_parser_begin(struct yaz_pqf_parser *li, const char *buf)
690 {
691  li->query_buf = li->query_ptr = buf;
692  li->lex_buf = 0;
693 }
694 
695 Z_RPNQuery *p_query_rpn(ODR o, const char *qbuf)
696 {
697  struct yaz_pqf_parser li;
698 
699  li.error = 0;
700  li.left_sep = "{\"";
701  li.right_sep = "}\"";
702  li.escape_char = '@';
703  li.term_type = Z_Term_general;
704 
705  pqf_parser_begin(&li, qbuf);
706  return p_query_rpn_mk(o, &li);
707 }
708 
709 static Z_AttributeList *p_query_scan_attributes_mk(struct yaz_pqf_parser *li,
710  ODR o,
711  Odr_oid **attributeSetP)
712 {
713  Odr_int attr_list[1024];
714  char *attr_clist[512];
715  Odr_oid *attr_set[512];
716  int num_attr = 0;
717  int max_attr = 512;
718  Odr_oid *top_set = 0;
719 
720  lex(li);
721  if (li->query_look == 'r')
722  {
723  lex(li);
724  top_set = query_oid_getvalbyname(li, o);
725  if (!top_set)
726  {
727  li->error = YAZ_PQF_ERROR_ATTSET;
728  return NULL;
729  }
730  lex(li);
731  }
732  if (!top_set)
733  {
734  top_set = odr_oiddup(o, yaz_oid_attset_bib_1);
735  }
736  *attributeSetP = top_set;
737 
738  while (1)
739  {
740  if (li->query_look == 'l')
741  {
742  lex(li);
743  if (!li->query_look)
744  {
745  li->error = YAZ_PQF_ERROR_MISSING;
746  return 0;
747  }
748  if (num_attr >= max_attr)
749  {
750  li->error = YAZ_PQF_ERROR_TOOMANY;
751  return 0;
752  }
753  if (!p_query_parse_attr(li, o, num_attr, attr_list,
754  attr_clist, attr_set))
755  return 0;
756  num_attr++;
757  lex(li);
758  }
759  else if (li->query_look == 'y')
760  {
761  lex(li);
762  rpn_term_type(li);
763  }
764  else
765  break;
766  }
767  return get_attributeList(o, num_attr, attr_list, attr_clist, attr_set);
768 }
769 
770 static Z_AttributesPlusTerm *p_query_scan_mk(struct yaz_pqf_parser *li,
771  ODR o,
772  Odr_oid **attributeSetP)
773 {
774  Z_AttributeList *attr_list = p_query_scan_attributes_mk(li, o, attributeSetP);
775  Z_AttributesPlusTerm *apt;
776 
777  if (!li->query_look)
778  {
779  li->error = YAZ_PQF_ERROR_MISSING;
780  return 0;
781  }
782  apt = rpn_term_attributes(li, o, attr_list);
783 
784  lex(li);
785 
786  if (li->query_look != 0)
787  {
788  li->error = YAZ_PQF_ERROR_EXTRA;
789  return 0;
790  }
791  return apt;
792 }
793 
794 YAZ_PQF_Parser yaz_pqf_create(void)
795 {
796  YAZ_PQF_Parser p = (YAZ_PQF_Parser) xmalloc(sizeof(*p));
797 
798  p->error = 0;
799  p->left_sep = "{\"";
800  p->right_sep = "}\"";
801  p->escape_char = '@';
802  p->term_type = Z_Term_general;
803 
804  return p;
805 }
806 
807 void yaz_pqf_destroy(YAZ_PQF_Parser p)
808 {
809  xfree(p);
810 }
811 
812 Z_RPNQuery *yaz_pqf_parse(YAZ_PQF_Parser p, ODR o, const char *qbuf)
813 {
814  if (!p)
815  return 0;
816  pqf_parser_begin(p, qbuf);
817  return p_query_rpn_mk(o, p);
818 }
819 
820 Z_AttributesPlusTerm *yaz_pqf_scan(YAZ_PQF_Parser p, ODR o,
821  Odr_oid **attributeSetP,
822  const char *qbuf)
823 {
824  if (!p)
825  return 0;
826  pqf_parser_begin(p, qbuf);
827  return p_query_scan_mk(p, o, attributeSetP);
828 }
829 
830 Z_AttributeList *yaz_pqf_scan_attribute_list(YAZ_PQF_Parser p, ODR o,
831  Odr_oid **attributeSetP,
832  const char *qbuf)
833 {
834  if (!p)
835  return 0;
836  pqf_parser_begin(p, qbuf);
837  return p_query_scan_attributes_mk(p, o, attributeSetP);
838 }
839 
840 static Z_FacetField* parse_facet(ODR odr, const char *facet)
841 {
842  YAZ_PQF_Parser pqf_parser = yaz_pqf_create();
843  struct yaz_pqf_parser *li = pqf_parser;
844  Odr_oid *attributeSetId;
845  Z_FacetField *facet_field = 0;
846  Z_AttributeList *attribute_list;
847 
848  pqf_parser_begin(pqf_parser, facet);
849  attribute_list = p_query_scan_attributes_mk(li, odr, &attributeSetId);
850  if (attribute_list)
851  {
852  facet_field = (Z_FacetField *) odr_malloc(odr, sizeof(*facet_field));
853  facet_field->attributes = attribute_list;
854  facet_field->num_terms = 0;
855  facet_field->terms = odr_malloc(odr, 10 * sizeof(*facet_field->terms));
856  while (li->query_look == 't')
857  {
858  if (facet_field->num_terms < 10)
859  {
860  char *es_str = odr_malloc(odr, li->lex_len+1);
861  int es_len = escape_string(es_str, li->lex_buf, li->lex_len);
862  Z_Term *term = z_Term_create(odr, li->term_type, es_str, es_len);
863 
864  facet_field->terms[facet_field->num_terms] =
865  (Z_FacetTerm *) odr_malloc(odr, sizeof(Z_FacetTerm));
866  facet_field->terms[facet_field->num_terms]->term = term;
867  facet_field->terms[facet_field->num_terms]->count =
868  odr_intdup(odr, 0);
869  facet_field->num_terms++;
870  }
871  lex(li);
872  }
873  }
874  yaz_pqf_destroy(pqf_parser);
875  return facet_field;
876 }
877 
878 Z_FacetList *yaz_pqf_parse_facet_list(ODR o, const char *qbuf)
879 {
880  char **darray;
881  int num;
882 
883  nmem_strsplit(odr_getmem(o), ",", qbuf, &darray, &num);
884  if (num > 0)
885  {
886  int i;
887  Z_FacetList *fl = (Z_FacetList*) odr_malloc(o, sizeof(*fl));
888  fl->num = num;
889  fl->elements = (Z_FacetField **)
890  odr_malloc(o, num * sizeof(*fl->elements));
891  for (i = 0; i < num; i++)
892  {
893  fl->elements[i] = parse_facet(o, darray[i]);
894  if (!fl->elements[i])
895  return 0;
896  }
897  return fl;
898  }
899  else
900  return 0;
901 }
902 
903 int yaz_pqf_error(YAZ_PQF_Parser p, const char **msg, size_t *off)
904 {
905  switch (p->error)
906  {
907  case YAZ_PQF_ERROR_NONE:
908  *msg = "no error"; break;
909  case YAZ_PQF_ERROR_EXTRA:
910  *msg = "extra token"; break;
911  case YAZ_PQF_ERROR_MISSING:
912  *msg = "missing token"; break;
913  case YAZ_PQF_ERROR_ATTSET:
914  *msg = "unknown attribute set"; break;
915  case YAZ_PQF_ERROR_TOOMANY:
916  *msg = "too many attributes"; break;
917  case YAZ_PQF_ERROR_BADATTR:
918  *msg = "bad attribute specification"; break;
919  case YAZ_PQF_ERROR_INTERNAL:
920  *msg = "internal error"; break;
921  case YAZ_PQF_ERROR_PROXIMITY:
922  *msg = "proximity error"; break;
923  case YAZ_PQF_ERROR_BAD_INTEGER:
924  *msg = "bad integer"; break;
925  default:
926  *msg = "unknown error"; break;
927  }
928  *off = p->query_ptr - p->query_buf;
929  return p->error;
930 }
931 /*
932  * Local variables:
933  * c-basic-offset: 4
934  * c-file-style: "Stroustrup"
935  * indent-tabs-mode: nil
936  * End:
937  * vim: shiftwidth=4 tabstop=8 expandtab
938  */
939 
Generated on Wed May 15 2013 14:55:31 for YAZ by   doxygen 1.8.1.2