1 /* $Id: d1_absyn.c,v 1.9.2.10 2006-09-29 10:02:42 adam Exp $
2 Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002
5 This file is part of the Zebra server.
7 Zebra is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 Zebra is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
31 #include <zebra_xpath.h>
33 #define D1_MAX_NESTING 128
38 struct data1_systag *next;
41 struct data1_absyn_cache_info
45 data1_absyn_cache next;
48 struct data1_attset_cache_info
52 data1_attset_cache next;
55 data1_absyn *data1_absyn_search (data1_handle dh, const char *name)
57 data1_absyn_cache p = *data1_absyn_cache_get (dh);
61 if (!strcmp (name, p->name))
68 We need to destroy DFAs, in xp_element (xelm) definitions
72 void data1_absyn_destroy (data1_handle dh)
74 data1_absyn_cache p = *data1_absyn_cache_get (dh);
78 data1_absyn *abs = p->absyn;
81 data1_xpelement *xpe = abs->xp_elements;
83 logf (LOG_DEBUG,"Destroy xp element %s",xpe->xpath_expr);
84 if (xpe->dfa) { dfa_delete (&xpe->dfa); }
93 void data1_absyn_trav (data1_handle dh, void *handle,
94 void (*fh)(data1_handle dh, void *h, data1_absyn *a))
96 data1_absyn_cache p = *data1_absyn_cache_get (dh);
100 (*fh)(dh, handle, p->absyn);
105 data1_absyn *data1_absyn_add (data1_handle dh, const char *name)
108 NMEM mem = data1_nmem_get (dh);
110 data1_absyn_cache p = (data1_absyn_cache)nmem_malloc (mem, sizeof(*p));
111 data1_absyn_cache *pp = data1_absyn_cache_get (dh);
113 sprintf(fname, "%s.abs", name);
114 p->absyn = data1_read_absyn (dh, fname, 0);
115 p->name = nmem_strdup (mem, name);
121 data1_absyn *data1_get_absyn (data1_handle dh, const char *name)
125 if (!(absyn = data1_absyn_search (dh, name)))
126 absyn = data1_absyn_add (dh, name);
130 data1_attset *data1_attset_search_name (data1_handle dh, const char *name)
132 data1_attset_cache p = *data1_attset_cache_get (dh);
136 if (!strcmp (name, p->name))
143 data1_attset *data1_attset_search_id (data1_handle dh, int id)
145 data1_attset_cache p = *data1_attset_cache_get (dh);
149 if (id == p->attset->reference)
156 data1_attset *data1_attset_add (data1_handle dh, const char *name)
158 char fname[512], aname[512];
159 NMEM mem = data1_nmem_get (dh);
160 data1_attset *attset;
162 strcpy (aname, name);
163 sprintf(fname, "%s.att", name);
164 attset = data1_read_attset (dh, fname);
168 attset = data1_read_attset (dh, name);
169 if (attset && (cp = strrchr (aname, '.')))
173 yaz_log (LOG_WARN|LOG_ERRNO, "Couldn't load attribute set %s", name);
176 data1_attset_cache p = (data1_attset_cache)
177 nmem_malloc (mem, sizeof(*p));
178 data1_attset_cache *pp = data1_attset_cache_get (dh);
180 attset->name = p->name = nmem_strdup (mem, aname);
188 data1_attset *data1_get_attset (data1_handle dh, const char *name)
190 data1_attset *attset;
192 if (!(attset = data1_attset_search_name (dh, name)))
193 attset = data1_attset_add (dh, name);
197 data1_esetname *data1_getesetbyname(data1_handle dh, data1_absyn *a,
202 for (r = a->esetnames; r; r = r->next)
203 if (!data1_matchstr(r->name, name))
208 data1_element *data1_getelementbytagname (data1_handle dh, data1_absyn *abs,
209 data1_element *parent,
214 /* It's now possible to have a data1 tree with no abstract syntax */
219 r = abs->main_elements;
221 r = parent->children;
223 for (; r; r = r->next)
227 for (n = r->tag->names; n; n = n->next)
228 if (!data1_matchstr(tagname, n->name))
234 data1_element *data1_getelementbyname (data1_handle dh, data1_absyn *absyn,
239 /* It's now possible to have a data1 tree with no abstract syntax */
242 for (r = absyn->main_elements; r; r = r->next)
243 if (!data1_matchstr(r->name, name))
249 void fix_element_ref (data1_handle dh, data1_absyn *absyn, data1_element *e)
251 /* It's now possible to have a data1 tree with no abstract syntax */
255 for (; e; e = e->next)
260 fix_element_ref (dh, absyn, e->children);
264 data1_sub_elements *sub_e = absyn->sub_elements;
265 while (sub_e && strcmp (e->sub_name, sub_e->name))
268 e->children = sub_e->elements;
270 yaz_log (LOG_WARN, "Unresolved reference to sub-elements %s",
277 New function, a bit dummy now... I've seen it in zrpn.c... We should build
278 more clever regexps...
290 Now [] predicates are supported
296 static const char * mk_xpath_regexp (data1_handle dh, const char *expr)
298 const char *p = expr;
302 char *res_p, *res = 0;
315 int is_predicate = 0;
318 for (i = 0; *p && !strchr("/",*p); i++, p++)
320 res_size += (i+3); /* we'll add / between later .. */
321 stack[e] = (char *) nmem_malloc(data1_nmem_get(dh), i+1);
323 for (j = 0; j < i; j++)
325 const char *pp = p-i+j;
344 res_p = res = nmem_malloc(data1_nmem_get(dh), res_size + 10);
347 if (stack[e-1][0] == '@') /* path/@attr spec (leaf is attribute) */
350 strcpy(res_p, "[^@]*/"); /* path .. (index all cdata below it) */
351 res_p = res_p + strlen(res_p);
353 sprintf(res_p, "%s/", stack[e]);
354 res_p += strlen(stack[e]) + 1;
358 sprintf(res_p, ".*");
361 sprintf (res_p, "$");
363 yaz_log(LOG_DEBUG, "Got regexp: %s", res);
369 added arg xpelement... when called from xelm context, it's 1, saying
370 that ! means xpath, not element name as attribute name...
374 static int parse_termlists (data1_handle dh, data1_termlist ***tpp,
375 char *cp, const char *file, int lineno,
376 const char *element_name, data1_absyn *res,
379 data1_termlist **tp = *tpp;
382 char attname[512], structure[512];
387 for (i = 0; cp[i] && i<sizeof(attname)-1; i++)
388 if (strchr(":,", cp[i]))
396 "%s:%d: Syntax error in termlistspec '%s'",
406 for (i = 0; cp[i] && i<sizeof(structure)-1; i++)
407 if (level == 0 && strchr(",", cp[i]))
411 structure[i] = cp[i];
414 else if (cp[i] == ')')
424 *tp = (data1_termlist *)
425 nmem_malloc(data1_nmem_get(dh), sizeof(**tp));
430 strcpy(attname, element_name);
432 if (!((*tp)->att = data1_getattbyname(dh, res->attset,
434 if ((!xpelement) || (*attname != '!')) {
436 "%s:%d: Couldn't find att '%s' in attset",
437 file, lineno, attname);
444 if (r == 2 && (source = strchr(structure, ':')))
445 *source++ = '\0'; /* cut off structure .. */
447 source = "data"; /* ok: default is leaf data */
448 (*tp)->source = (char *)
449 nmem_strdup (data1_nmem_get (dh), source);
451 if (r < 2) /* is the structure qualified? */
452 (*tp)->structure = "w";
454 (*tp)->structure = (char *)
455 nmem_strdup (data1_nmem_get (dh), structure);
464 * Converts a 'melm' field[$subfield] pattern to a simple xpath
466 static int melm2xpath(char *melm, char *buf)
472 if ((dollar = strchr(melm, '$'))) {
477 if (field[0] == '0' && field[1] == '0')
478 fieldtype = "controlfield";
480 fieldtype = "datafield";
481 sprintf(buf, "/*/%s[@tag=\"%s\"]", fieldtype, field);
483 sprintf(buf + strlen(buf), "/subfield[@code=\"%s\"]", subfield);
484 else if (field[0] != '0' || field[1] != '0')
485 strcat(buf, "/subfield");
486 yaz_log(LOG_DEBUG, "Created xpath: '%s'", buf);
490 const char *data1_systag_lookup(data1_absyn *absyn, const char *tag,
491 const char *default_value)
493 struct data1_systag *p = absyn->systags;
494 for (; p; p = p->next)
495 if (!strcmp(p->name, tag))
497 return default_value;
500 #define l_isspace(c) ((c) == '\t' || (c) == ' ' || (c) == '\n' || (c) == '\r')
502 int read_absyn_line(FILE *f, int *lineno, char *line, int len,
503 char *argv[], int num)
509 while ((p = fgets(line, len, f)))
512 while (*p && l_isspace(*p))
520 for (argc = 0; *p ; argc++)
522 if (*p == '#') /* trailing comment */
525 while (*p && !(l_isspace(*p) && !quoted)) {
526 if (*p =='"') quoted = 1 - quoted;
527 if (*p =='[') quoted = 1;
528 if (*p ==']') quoted = 0;
534 while (*p && l_isspace(*p))
542 data1_absyn *data1_read_absyn (data1_handle dh, const char *file,
545 data1_sub_elements *cur_elements = NULL;
546 data1_xpelement **cur_xpelement = NULL;
548 data1_absyn *res = 0;
550 data1_element **ppl[D1_MAX_NESTING];
551 data1_esetname **esetpp;
552 data1_maptab **maptabp;
553 data1_marctab **marcp;
554 data1_termlist *all = 0;
555 data1_attset_child **attset_childp;
556 data1_tagset **tagset_childp;
557 struct data1_systag **systagsp;
561 char *argv[50], line[512];
563 if (!(f = data1_path_fopen(dh, file, "r")))
565 yaz_log(LOG_WARN|LOG_ERRNO, "Couldn't open %s", file);
570 res = (data1_absyn *) nmem_malloc(data1_nmem_get(dh), sizeof(*res));
572 res->reference = VAL_NONE;
575 res->enable_xpath_indexing = (f ? 0 : 1);
577 systagsp = &res->systags;
578 tagset_childp = &res->tagset;
580 res->attset = data1_empty_attset (dh);
581 attset_childp = &res->attset->children;
585 esetpp = &res->esetnames;
587 maptabp = &res->maptabs;
590 res->sub_elements = NULL;
591 res->main_elements = NULL;
592 res->xp_elements = NULL;
593 cur_xpelement = &res->xp_elements;
595 while (f && (argc = read_absyn_line(f, &lineno, line, 512, argv, 50)))
598 if (!strcmp(cmd, "elm") || !strcmp(cmd, "element"))
600 data1_element *new_element;
602 char *p, *sub_p, *path, *name, *termlists;
608 yaz_log(LOG_WARN, "%s:%d: Bad # of args to elm", file, lineno);
617 cur_elements = (data1_sub_elements *)
618 nmem_malloc(data1_nmem_get(dh), sizeof(*cur_elements));
619 cur_elements->next = res->sub_elements;
620 cur_elements->elements = NULL;
621 cur_elements->name = "main";
622 res->sub_elements = cur_elements;
625 ppl[level] = &cur_elements->elements;
632 if ((e = strchr(p, '/')))
639 yaz_log(LOG_WARN, "%s:%d: Bad level increase", file, lineno);
644 new_element = *ppl[level-1] = (data1_element *)
645 nmem_malloc(data1_nmem_get(dh), sizeof(*new_element));
646 new_element->next = new_element->children = 0;
647 new_element->tag = 0;
648 new_element->termlists = 0;
649 new_element->sub_name = 0;
651 tp = &new_element->termlists;
652 ppl[level-1] = &new_element->next;
653 ppl[level] = &new_element->children;
655 /* consider subtree (if any) ... */
656 if ((sub_p = strchr (p, ':')) && sub_p[1])
659 new_element->sub_name =
660 nmem_strdup (data1_nmem_get(dh), sub_p);
662 /* well-defined tag */
663 if (sscanf(p, "(%d,%d)", &type, &value) == 2)
667 yaz_log(LOG_WARN, "%s:%d: No tagset loaded", file, lineno);
671 if (!(new_element->tag = data1_gettagbynum (dh, res->tagset,
674 yaz_log(LOG_WARN, "%s:%d: Couldn't find tag %s in tagset",
684 new_element->tag = (data1_tag *)
685 nmem_malloc(data1_nmem_get (dh),
686 sizeof(*new_element->tag));
687 nt->which = DATA1T_string;
688 nt->value.string = nmem_strdup(data1_nmem_get (dh), p);
689 nt->names = (data1_name *)
690 nmem_malloc(data1_nmem_get(dh),
691 sizeof(*new_element->tag->names));
692 nt->names->name = nt->value.string;
694 nt->kind = DATA1K_string;
700 yaz_log(LOG_WARN, "%s:%d: Bad element", file, lineno);
704 /* parse termList definitions */
708 assert (res->attset);
710 if (parse_termlists (dh, &tp, p, file, lineno, name, res, 0))
715 *tp = all; /* append any ALL entries to the list */
717 new_element->name = nmem_strdup(data1_nmem_get (dh), name);
720 New code to support xelm directive
721 for each xelm a dfa is built. xelms are stored in res->xp_elements
723 maybe we should use a simple sscanf instead of dfa?
727 Now [] predicates are supported. regexps and xpath structure is
728 a bit redundant, however it's comfortable later...
733 else if (!strcmp(cmd, "xelm") || !strcmp(cmd, "melm")) {
736 char *p, *xpath_expr, *termlists;
737 const char *regexp = 0;
740 char melm_xpath[128];
741 data1_xpelement *xp_ele = 0;
742 data1_xpelement *last_match = 0;
747 yaz_log(LOG_WARN, "%s:%d: Bad # of args to xelm", file, lineno);
751 if (!strcmp(cmd, "melm")) {
752 if (melm2xpath(argv[1], melm_xpath) < 0)
754 xpath_expr = melm_xpath;
756 xpath_expr = argv[1];
759 regexp = mk_xpath_regexp(dh, xpath_expr);
761 /* get last of existing regulars with same regexp */
762 for (xp_ele = res->xp_elements; xp_ele; xp_ele = xp_ele->next)
763 if (!strcmp(xp_ele->regexp, regexp))
768 const char *regexp_ptr = regexp;
771 i = dfa_parse (dfa, ®exp_ptr);
772 if (i || *regexp_ptr) {
773 yaz_log(YLOG_WARN, "%s:%d: Bad xpath to xelm", file, lineno);
778 *cur_xpelement = (data1_xpelement *)
779 nmem_malloc(data1_nmem_get(dh), sizeof(**cur_xpelement));
780 (*cur_xpelement)->next = 0;
781 (*cur_xpelement)->match_next = 0;
783 last_match->match_next = *cur_xpelement;
785 (*cur_xpelement)->regexp = regexp;
787 (*cur_xpelement)->next = NULL;
788 (*cur_xpelement)->xpath_expr = nmem_strdup(data1_nmem_get (dh),
792 (*cur_xpelement)->dfa = dfa;
794 (*cur_xpelement)->xpath_len =
795 zebra_parse_xpath_str(xpath_expr,
796 (*cur_xpelement)->xpath, XPATH_STEP_COUNT,
800 (*cur_xpelement)->termlists = 0;
801 tp = &(*cur_xpelement)->termlists;
803 /* parse termList definitions */
807 assert (res->attset);
809 if (parse_termlists (dh, &tp, p, file, lineno,
815 *tp = all; /* append any ALL entries to the list */
817 cur_xpelement = &(*cur_xpelement)->next;
819 else if (!strcmp(cmd, "section"))
825 yaz_log(LOG_WARN, "%s:%d: Bad # of args to section",
831 cur_elements = (data1_sub_elements *)
832 nmem_malloc(data1_nmem_get(dh), sizeof(*cur_elements));
833 cur_elements->next = res->sub_elements;
834 cur_elements->elements = NULL;
835 cur_elements->name = nmem_strdup (data1_nmem_get(dh), name);
836 res->sub_elements = cur_elements;
839 ppl[level] = &cur_elements->elements;
841 else if (!strcmp(cmd, "xpath"))
845 yaz_log(LOG_WARN, "%s:%d: Bad # of args to 'xpath' directive",
849 if (!strcmp(argv[1], "enable"))
850 res->enable_xpath_indexing = 1;
851 else if (!strcmp (argv[1], "disable"))
852 res->enable_xpath_indexing = 0;
855 yaz_log(LOG_WARN, "%s:%d: Expecting disable/enable "
856 "after 'xpath' directive", file, lineno);
859 else if (!strcmp(cmd, "all"))
861 data1_termlist **tp = &all;
864 yaz_log(LOG_WARN, "%s:%d: Too many 'all' directives - ignored",
870 yaz_log(LOG_WARN, "%s:%d: Bad # of args to 'all' directive",
874 if (parse_termlists (dh, &tp, argv[1], file, lineno, 0, res, 0))
880 else if (!strcmp(cmd, "name"))
884 yaz_log(LOG_WARN, "%s:%d: Bad # of args to name directive",
888 res->name = nmem_strdup(data1_nmem_get(dh), argv[1]);
890 else if (!strcmp(cmd, "reference"))
896 yaz_log(LOG_WARN, "%s:%d: Bad # of args to reference",
901 if ((res->reference = oid_getvalbyname(name)) == VAL_NONE)
903 yaz_log(LOG_WARN, "%s:%d: Unknown tagset ref '%s'",
908 else if (!strcmp(cmd, "attset"))
911 data1_attset *attset;
915 yaz_log(LOG_WARN, "%s:%d: Bad # of args to attset",
920 if (!(attset = data1_get_attset (dh, name)))
922 yaz_log(LOG_WARN, "%s:%d: Couldn't find attset %s",
926 *attset_childp = (data1_attset_child *)
927 nmem_malloc (data1_nmem_get(dh), sizeof(**attset_childp));
928 (*attset_childp)->child = attset;
929 (*attset_childp)->next = 0;
930 attset_childp = &(*attset_childp)->next;
932 else if (!strcmp(cmd, "tagset"))
938 yaz_log(LOG_WARN, "%s:%d: Bad # of args to tagset",
944 type = atoi(argv[2]);
945 *tagset_childp = data1_read_tagset (dh, name, type);
946 if (!(*tagset_childp))
948 yaz_log(LOG_WARN, "%s:%d: Couldn't load tagset %s",
952 tagset_childp = &(*tagset_childp)->next;
954 else if (!strcmp(cmd, "varset"))
960 yaz_log(LOG_WARN, "%s:%d: Bad # of args in varset",
965 if (!(res->varset = data1_read_varset (dh, name)))
967 yaz_log(LOG_WARN, "%s:%d: Couldn't load Varset %s",
972 else if (!strcmp(cmd, "esetname"))
978 yaz_log(LOG_WARN, "%s:%d: Bad # of args in esetname",
985 *esetpp = (data1_esetname *)
986 nmem_malloc(data1_nmem_get(dh), sizeof(**esetpp));
987 (*esetpp)->name = nmem_strdup(data1_nmem_get(dh), name);
991 else if (!((*esetpp)->spec = data1_read_espec1 (dh, fname)))
993 yaz_log(LOG_WARN, "%s:%d: Espec-1 read failed for %s",
994 file, lineno, fname);
997 esetpp = &(*esetpp)->next;
999 else if (!strcmp(cmd, "maptab"))
1005 yaz_log(LOG_WARN, "%s:%d: Bad # of args for maptab",
1010 if (!(*maptabp = data1_read_maptab (dh, name)))
1012 yaz_log(LOG_WARN, "%s:%d: Couldn't load maptab %s",
1013 file, lineno, name);
1016 maptabp = &(*maptabp)->next;
1018 else if (!strcmp(cmd, "marc"))
1024 yaz_log(LOG_WARN, "%s:%d: Bad # or args for marc",
1029 if (!(*marcp = data1_read_marctab (dh, name)))
1031 yaz_log(LOG_WARN, "%s:%d: Couldn't read marctab %s",
1032 file, lineno, name);
1035 marcp = &(*marcp)->next;
1037 else if (!strcmp(cmd, "encoding"))
1041 yaz_log(LOG_WARN, "%s:%d: Bad # or args for encoding",
1045 res->encoding = nmem_strdup (data1_nmem_get(dh), argv[1]);
1047 else if (!strcmp(cmd, "systag"))
1051 yaz_log(LOG_WARN, "%s:%d: Bad # or args for systag",
1055 *systagsp = nmem_malloc (data1_nmem_get(dh), sizeof(**systagsp));
1057 (*systagsp)->name = nmem_strdup(data1_nmem_get(dh), argv[1]);
1058 (*systagsp)->value = nmem_strdup(data1_nmem_get(dh), argv[2]);
1059 systagsp = &(*systagsp)->next;
1063 yaz_log(LOG_WARN, "%s:%d: Unknown directive '%s'", file,
1071 for (cur_elements = res->sub_elements; cur_elements;
1072 cur_elements = cur_elements->next)
1074 if (!strcmp (cur_elements->name, "main"))
1075 res->main_elements = cur_elements->elements;
1076 fix_element_ref (dh, res, cur_elements->elements);
1079 yaz_log (LOG_DEBUG, "%s: data1_read_absyn end", file);