1 /* PSPP - computes sample statistics.
2 Copyright (C) 1997-9, 2000, 2006 Free Software Foundation, Inc.
3 Written by Ben Pfaff <blp@gnu.org>.
5 This program is free software; you can redistribute it and/or
6 modify it under the terms of the GNU General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
10 This program is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
21 #include "dictionary.h"
28 #include "cat-routines.h"
34 #include "value-labels.h"
38 #define _(msgid) gettext (msgid)
43 struct variable **var; /* Variables. */
44 size_t var_cnt, var_cap; /* Number of variables, capacity. */
45 struct hsh_table *name_tab; /* Variable index by name. */
46 int next_value_idx; /* Index of next `union value' to allocate. */
47 struct variable **split; /* SPLIT FILE vars. */
48 size_t split_cnt; /* SPLIT FILE count. */
49 struct variable *weight; /* WEIGHT variable. */
50 struct variable *filter; /* FILTER variable. */
51 int case_limit; /* Current case limit (N command). */
52 char *label; /* File label. */
53 char *documents; /* Documents, as a string. */
54 struct vector **vector; /* Vectors of variables. */
55 size_t vector_cnt; /* Number of vectors. */
58 /* Active file dictionary. */
59 struct dictionary *default_dict;
61 /* Creates and returns a new dictionary. */
65 struct dictionary *d = xmalloc (sizeof *d);
68 d->var_cnt = d->var_cap = 0;
69 d->name_tab = hsh_create (8, compare_var_names, hash_var_name, NULL, NULL);
70 d->next_value_idx = 0;
84 /* Creates and returns a (deep) copy of an existing
87 dict_clone (const struct dictionary *s)
96 for (i = 0; i < s->var_cnt; i++)
98 struct variable *sv = s->var[i];
99 struct variable *dv = dict_clone_var_assert (d, sv, sv->name);
100 var_set_short_name (dv, sv->short_name);
103 d->next_value_idx = s->next_value_idx;
105 d->split_cnt = s->split_cnt;
106 if (d->split_cnt > 0)
108 d->split = xnmalloc (d->split_cnt, sizeof *d->split);
109 for (i = 0; i < d->split_cnt; i++)
110 d->split[i] = dict_lookup_var_assert (d, s->split[i]->name);
113 if (s->weight != NULL)
114 d->weight = dict_lookup_var_assert (d, s->weight->name);
116 if (s->filter != NULL)
117 d->filter = dict_lookup_var_assert (d, s->filter->name);
119 d->case_limit = s->case_limit;
120 dict_set_label (d, dict_get_label (s));
121 dict_set_documents (d, dict_get_documents (s));
123 d->vector_cnt = s->vector_cnt;
124 d->vector = xnmalloc (d->vector_cnt, sizeof *d->vector);
125 for (i = 0; i < s->vector_cnt; i++)
127 struct vector *sv = s->vector[i];
128 struct vector *dv = d->vector[i] = xmalloc (sizeof *dv);
132 strcpy (dv->name, sv->name);
134 dv->var = xnmalloc (dv->cnt, sizeof *dv->var);
135 for (j = 0; j < dv->cnt; j++)
136 dv->var[j] = d->var[sv->var[j]->index];
142 /* Clears the contents from a dictionary without destroying the
143 dictionary itself. */
145 dict_clear (struct dictionary *d)
147 /* FIXME? Should we really clear case_limit, label, documents?
148 Others are necessarily cleared by deleting all the variables.*/
153 for (i = 0; i < d->var_cnt; i++)
155 struct variable *v = d->var[i];
157 val_labs_destroy (v->val_labs);
163 d->var_cnt = d->var_cap = 0;
164 hsh_clear (d->name_tab);
165 d->next_value_idx = 0;
176 dict_clear_vectors (d);
179 /* Destroys the aux data for every variable in D, by calling
180 var_clear_aux() for each variable. */
182 dict_clear_aux (struct dictionary *d)
188 for (i = 0; i < d->var_cnt; i++)
189 var_clear_aux (d->var[i]);
192 /* Clears a dictionary and destroys it. */
194 dict_destroy (struct dictionary *d)
199 hsh_destroy (d->name_tab);
204 /* Returns the number of variables in D. */
206 dict_get_var_cnt (const struct dictionary *d)
213 /* Returns the variable in D with index IDX, which must be
214 between 0 and the count returned by dict_get_var_cnt(),
217 dict_get_var (const struct dictionary *d, size_t idx)
220 assert (idx < d->var_cnt);
225 /* Sets *VARS to an array of pointers to variables in D and *CNT
226 to the number of variables in *D. By default all variables
227 are returned, but bits may be set in EXCLUDE_CLASSES to
228 exclude ordinary, system, and/or scratch variables. */
230 dict_get_vars (const struct dictionary *d, struct variable ***vars,
231 size_t *cnt, unsigned exclude_classes)
237 assert (vars != NULL);
238 assert (cnt != NULL);
239 assert ((exclude_classes & ~((1u << DC_ORDINARY)
241 | (1u << DC_SCRATCH))) == 0);
244 for (i = 0; i < d->var_cnt; i++)
245 if (!(exclude_classes & (1u << dict_class_from_id (d->var[i]->name))))
248 *vars = xnmalloc (count, sizeof **vars);
250 for (i = 0; i < d->var_cnt; i++)
251 if (!(exclude_classes & (1u << dict_class_from_id (d->var[i]->name))))
252 (*vars)[(*cnt)++] = d->var[i];
253 assert (*cnt == count);
257 /* Creates and returns a new variable in D with the given NAME
258 and WIDTH. Returns a null pointer if the given NAME would
259 duplicate that of an existing variable in the dictionary. */
261 dict_create_var (struct dictionary *d, const char *name, int width)
266 assert (name != NULL);
268 assert (width >= 0 && width < 256);
270 assert (var_is_valid_name(name,0));
272 /* Make sure there's not already a variable by that name. */
273 if (dict_lookup_var (d, name) != NULL)
276 /* Allocate and initialize variable. */
277 v = xmalloc (sizeof *v);
278 str_copy_trunc (v->name, sizeof v->name, name);
279 v->type = width == 0 ? NUMERIC : ALPHA;
281 v->fv = d->next_value_idx;
282 v->nv = width == 0 ? 1 : DIV_RND_UP (width, 8);
284 v->reinit = dict_class_from_id (v->name) != DC_SCRATCH;
285 v->index = d->var_cnt;
286 mv_init (&v->miss, width);
287 if (v->type == NUMERIC)
290 v->alignment = ALIGN_RIGHT;
291 v->display_width = 8;
292 v->measure = MEASURE_SCALE;
296 v->print = make_output_format (FMT_A, v->width, 0);
297 v->alignment = ALIGN_LEFT;
298 v->display_width = 8;
299 v->measure = MEASURE_NOMINAL;
302 v->val_labs = val_labs_create (v->width);
304 var_clear_short_name (v);
309 /* Update dictionary. */
310 if (d->var_cnt >= d->var_cap)
312 d->var_cap = 8 + 2 * d->var_cap;
313 d->var = xnrealloc (d->var, d->var_cap, sizeof *d->var);
315 d->var[v->index] = v;
317 hsh_force_insert (d->name_tab, v);
319 d->next_value_idx += v->nv;
324 /* Creates and returns a new variable in D with the given NAME
325 and WIDTH. Assert-fails if the given NAME would duplicate
326 that of an existing variable in the dictionary. */
328 dict_create_var_assert (struct dictionary *d, const char *name, int width)
330 struct variable *v = dict_create_var (d, name, width);
335 /* Creates and returns a new variable in D with name NAME, as a
336 copy of existing variable OV, which need not be in D or in any
337 dictionary. Returns a null pointer if the given NAME would
338 duplicate that of an existing variable in the dictionary. */
340 dict_clone_var (struct dictionary *d, const struct variable *ov,
347 assert (name != NULL);
349 assert (strlen (name) >= 1);
350 assert (strlen (name) <= LONG_NAME_LEN);
352 nv = dict_create_var (d, name, ov->width);
356 /* Copy most members not copied via dict_create_var().
357 short_name[] is intentionally not copied, because there is
358 no reason to give a new variable with potentially a new name
359 the same short name. */
361 nv->reinit = ov->reinit;
362 mv_copy (&nv->miss, &ov->miss);
363 nv->print = ov->print;
364 nv->write = ov->write;
365 val_labs_destroy (nv->val_labs);
366 nv->val_labs = val_labs_copy (ov->val_labs);
367 if (ov->label != NULL)
368 nv->label = xstrdup (ov->label);
369 nv->measure = ov->measure;
370 nv->display_width = ov->display_width;
371 nv->alignment = ov->alignment;
376 /* Creates and returns a new variable in D with name NAME, as a
377 copy of existing variable OV, which need not be in D or in any
378 dictionary. Assert-fails if the given NAME would duplicate
379 that of an existing variable in the dictionary. */
381 dict_clone_var_assert (struct dictionary *d, const struct variable *ov,
384 struct variable *v = dict_clone_var (d, ov, name);
389 /* Returns the variable named NAME in D, or a null pointer if no
390 variable has that name. */
392 dict_lookup_var (const struct dictionary *d, const char *name)
397 assert (name != NULL);
399 str_copy_trunc (v.name, sizeof v.name, name);
400 return hsh_find (d->name_tab, &v);
403 /* Returns the variable named NAME in D. Assert-fails if no
404 variable has that name. */
406 dict_lookup_var_assert (const struct dictionary *d, const char *name)
408 struct variable *v = dict_lookup_var (d, name);
413 /* Returns true if variable V is in dictionary D,
416 dict_contains_var (const struct dictionary *d, const struct variable *v)
421 return v->index >= 0 && v->index < d->var_cnt && d->var[v->index] == v;
424 /* Compares two double pointers to variables, which should point
425 to elements of a struct dictionary's `var' member array. */
427 compare_var_ptrs (const void *a_, const void *b_, void *aux UNUSED)
429 struct variable *const *a = a_;
430 struct variable *const *b = b_;
432 return *a < *b ? -1 : *a > *b;
435 /* Deletes variable V from dictionary D and frees V.
437 This is a very bad idea if there might be any pointers to V
438 from outside D. In general, no variable in default_dict
439 should be deleted when any transformations are active, because
440 those transformations might reference the deleted variable.
441 The safest time to delete a variable is just after a procedure
442 has been executed, as done by MODIFY VARS.
444 Pointers to V within D are not a problem, because
445 dict_delete_var() knows to remove V from split variables,
446 weights, filters, etc. */
448 dict_delete_var (struct dictionary *d, struct variable *v)
454 assert (dict_contains_var (d, v));
456 /* Delete aux data. */
459 /* Remove V from splits, weight, filter variables. */
460 d->split_cnt = remove_equal (d->split, d->split_cnt, sizeof *d->split,
461 &v, compare_var_ptrs, NULL);
466 dict_clear_vectors (d);
468 /* Remove V from var array. */
469 remove_element (d->var, d->var_cnt, sizeof *d->var, v->index);
473 for (i = v->index; i < d->var_cnt; i++)
474 d->var[i]->index = i;
476 /* Update name hash. */
477 hsh_force_delete (d->name_tab, v);
480 val_labs_destroy (v->val_labs);
481 cat_stored_values_destroy (v);
486 /* Deletes the COUNT variables listed in VARS from D. This is
487 unsafe; see the comment on dict_delete_var() for details. */
489 dict_delete_vars (struct dictionary *d,
490 struct variable *const *vars, size_t count)
492 /* FIXME: this can be done in O(count) time, but this algorithm
495 assert (count == 0 || vars != NULL);
498 dict_delete_var (d, *vars++);
501 /* Deletes scratch variables from dictionary D. */
503 dict_delete_scratch_vars (struct dictionary *d)
507 /* FIXME: this can be done in O(count) time, but this algorithm
511 for (i = 0; i < d->var_cnt; )
512 if (dict_class_from_id (d->var[i]->name) == DC_SCRATCH)
513 dict_delete_var (d, d->var[i]);
518 /* Moves V to 0-based position IDX in D. Other variables in D,
519 if any, retain their relative positions. Runs in time linear
520 in the distance moved. */
522 dict_reorder_var (struct dictionary *d, struct variable *v,
525 size_t min_idx, max_idx;
530 assert (dict_contains_var (d, v));
531 assert (new_index < d->var_cnt);
533 move_element (d->var, d->var_cnt, sizeof *d->var, v->index, new_index);
535 min_idx = min (v->index, new_index);
536 max_idx = max (v->index, new_index);
537 for (i = min_idx; i <= max_idx; i++)
538 d->var[i]->index = i;
541 /* Reorders the variables in D, placing the COUNT variables
542 listed in ORDER in that order at the beginning of D. The
543 other variables in D, if any, retain their relative
546 dict_reorder_vars (struct dictionary *d,
547 struct variable *const *order, size_t count)
549 struct variable **new_var;
553 assert (count == 0 || order != NULL);
554 assert (count <= d->var_cnt);
556 new_var = xnmalloc (d->var_cnt, sizeof *new_var);
557 memcpy (new_var, order, count * sizeof *new_var);
558 for (i = 0; i < count; i++)
560 assert (d->var[order[i]->index] != NULL);
561 d->var[order[i]->index] = NULL;
564 for (i = 0; i < d->var_cnt; i++)
565 if (d->var[i] != NULL)
567 assert (count < d->var_cnt);
568 new_var[count] = d->var[i];
569 new_var[count]->index = count;
576 /* Changes the name of V in D to name NEW_NAME. Assert-fails if
577 a variable named NEW_NAME is already in D, except that
578 NEW_NAME may be the same as V's existing name. */
580 dict_rename_var (struct dictionary *d, struct variable *v,
581 const char *new_name)
585 assert (new_name != NULL);
586 assert (var_is_valid_name (new_name, false));
587 assert (dict_contains_var (d, v));
588 assert (!compare_var_names (v->name, new_name, NULL)
589 || dict_lookup_var (d, new_name) == NULL);
591 hsh_force_delete (d->name_tab, v);
592 str_copy_trunc (v->name, sizeof v->name, new_name);
593 hsh_force_insert (d->name_tab, v);
595 if (get_algorithm () == ENHANCED)
596 var_clear_short_name (v);
599 /* Renames COUNT variables specified in VARS to the names given
600 in NEW_NAMES within dictionary D. If the renaming would
601 result in a duplicate variable name, returns false and stores a
602 name that would be duplicated into *ERR_NAME (if ERR_NAME is
603 non-null). Otherwise, the renaming is successful, and true
606 dict_rename_vars (struct dictionary *d,
607 struct variable **vars, char **new_names,
608 size_t count, char **err_name)
615 assert (count == 0 || vars != NULL);
616 assert (count == 0 || new_names != NULL);
618 /* Remove the variables to be renamed from the name hash,
619 save their names, and rename them. */
620 old_names = xnmalloc (count, sizeof *old_names);
621 for (i = 0; i < count; i++)
623 assert (d->var[vars[i]->index] == vars[i]);
624 assert (var_is_valid_name (new_names[i], false));
625 hsh_force_delete (d->name_tab, vars[i]);
626 old_names[i] = xstrdup (vars[i]->name);
627 strcpy (vars[i]->name, new_names[i]);
630 /* Add the renamed variables back into the name hash,
631 checking for conflicts. */
632 for (i = 0; i < count; i++)
634 assert (new_names[i] != NULL);
635 assert (*new_names[i] != '\0');
636 assert (strlen (new_names[i]) >= 1);
637 assert (strlen (new_names[i]) <= LONG_NAME_LEN);
639 if (hsh_insert (d->name_tab, vars[i]) != NULL)
641 /* There is a name conflict.
642 Back out all the name changes that have already
643 taken place, and indicate failure. */
645 if (err_name != NULL)
646 *err_name = new_names[i];
648 for (i = 0; i < fail_idx; i++)
649 hsh_force_delete (d->name_tab, vars[i]);
651 for (i = 0; i < count; i++)
653 strcpy (vars[i]->name, old_names[i]);
654 hsh_force_insert (d->name_tab, vars[i]);
662 /* Clear short names. */
663 if (get_algorithm () == ENHANCED)
664 for (i = 0; i < count; i++)
665 var_clear_short_name (vars[i]);
668 /* Free the old names we kept around. */
669 for (i = 0; i < count; i++)
676 /* Returns the weighting variable in dictionary D, or a null
677 pointer if the dictionary is unweighted. */
679 dict_get_weight (const struct dictionary *d)
682 assert (d->weight == NULL || dict_contains_var (d, d->weight));
687 /* Returns the value of D's weighting variable in case C, except that a
688 negative weight is returned as 0. Returns 1 if the dictionary is
689 unweighted. Will warn about missing, negative, or zero values if
690 warn_on_invalid is nonzero. The function will set warn_on_invalid to zero
691 if an invalid weight is found. */
693 dict_get_case_weight (const struct dictionary *d, const struct ccase *c,
694 int *warn_on_invalid)
699 if (d->weight == NULL)
703 double w = case_num (c, d->weight->fv);
704 if (w < 0.0 || mv_is_num_missing (&d->weight->miss, w))
706 if ( w == 0.0 && *warn_on_invalid ) {
707 *warn_on_invalid = 0;
708 msg (SW, _("At least one case in the data file had a weight value "
709 "that was user-missing, system-missing, zero, or "
710 "negative. These case(s) were ignored."));
716 /* Sets the weighting variable of D to V, or turning off
717 weighting if V is a null pointer. */
719 dict_set_weight (struct dictionary *d, struct variable *v)
722 assert (v == NULL || dict_contains_var (d, v));
723 assert (v == NULL || v->type == NUMERIC);
728 /* Returns the filter variable in dictionary D (see cmd_filter())
729 or a null pointer if the dictionary is unfiltered. */
731 dict_get_filter (const struct dictionary *d)
734 assert (d->filter == NULL || dict_contains_var (d, d->filter));
739 /* Sets V as the filter variable for dictionary D. Passing a
740 null pointer for V turn off filtering. */
742 dict_set_filter (struct dictionary *d, struct variable *v)
745 assert (v == NULL || dict_contains_var (d, v));
750 /* Returns the case limit for dictionary D, or zero if the number
751 of cases is unlimited (see cmd_n()). */
753 dict_get_case_limit (const struct dictionary *d)
757 return d->case_limit;
760 /* Sets CASE_LIMIT as the case limit for dictionary D. Zero for
761 CASE_LIMIT indicates no limit. */
763 dict_set_case_limit (struct dictionary *d, int case_limit)
766 assert (case_limit >= 0);
768 d->case_limit = case_limit;
771 /* Returns the index of the next value to be added to D. This
772 value is the number of `union value's that need to be
773 allocated to store a case for dictionary D. */
775 dict_get_next_value_idx (const struct dictionary *d)
779 return d->next_value_idx;
782 /* Returns the number of bytes needed to store a case for
785 dict_get_case_size (const struct dictionary *d)
789 return sizeof (union value) * dict_get_next_value_idx (d);
792 /* Deletes scratch variables in dictionary D and reassigns values
793 so that fragmentation is eliminated. */
795 dict_compact_values (struct dictionary *d)
799 d->next_value_idx = 0;
800 for (i = 0; i < d->var_cnt; )
802 struct variable *v = d->var[i];
804 if (dict_class_from_id (v->name) != DC_SCRATCH)
806 v->fv = d->next_value_idx;
807 d->next_value_idx += v->nv;
811 dict_delete_var (d, v);
815 /* Returns the number of values that would be used by a case if
816 dict_compact_values() were called. */
818 dict_get_compacted_value_cnt (const struct dictionary *d)
824 for (i = 0; i < d->var_cnt; i++)
825 if (dict_class_from_id (d->var[i]->name) != DC_SCRATCH)
826 cnt += d->var[i]->nv;
830 /* Creates and returns an array mapping from a dictionary index
831 to the `fv' that the corresponding variable will have after
832 calling dict_compact_values(). Scratch variables receive -1
833 for `fv' because dict_compact_values() will delete them. */
835 dict_get_compacted_idx_to_fv (const struct dictionary *d)
838 size_t next_value_idx;
841 idx_to_fv = xnmalloc (d->var_cnt, sizeof *idx_to_fv);
843 for (i = 0; i < d->var_cnt; i++)
845 struct variable *v = d->var[i];
847 if (dict_class_from_id (v->name) != DC_SCRATCH)
849 idx_to_fv[i] = next_value_idx;
850 next_value_idx += v->nv;
858 /* Returns true if a case for dictionary D would be smaller after
859 compaction, false otherwise. Compacting a case eliminates
860 "holes" between values and after the last value. Holes are
861 created by deleting variables (or by scratch variables).
863 The return value may differ from whether compacting a case
864 from dictionary D would *change* the case: compaction could
865 rearrange values even if it didn't reduce space
868 dict_needs_compaction (const struct dictionary *d)
870 return dict_get_compacted_value_cnt (d) < dict_get_next_value_idx (d);
873 /* How to copy a contiguous range of values between cases. */
876 size_t src_idx; /* Starting value index in source case. */
877 size_t dst_idx; /* Starting value index in target case. */
878 size_t cnt; /* Number of values. */
881 /* How to compact a case. */
882 struct dict_compactor
884 struct copy_map *maps; /* Array of mappings. */
885 size_t map_cnt; /* Number of mappings. */
888 /* Creates and returns a dict_compactor that can be used to
889 compact cases for dictionary D.
891 Compacting a case eliminates "holes" between values and after
892 the last value. Holes are created by deleting variables (or
893 by scratch variables). */
894 struct dict_compactor *
895 dict_make_compactor (const struct dictionary *d)
897 struct dict_compactor *compactor;
898 struct copy_map *map;
899 size_t map_allocated;
903 compactor = xmalloc (sizeof *compactor);
904 compactor->maps = NULL;
905 compactor->map_cnt = 0;
910 for (i = 0; i < d->var_cnt; i++)
912 struct variable *v = d->var[i];
914 if (dict_class_from_id (v->name) == DC_SCRATCH)
916 if (map != NULL && map->src_idx + map->cnt == v->fv)
920 if (compactor->map_cnt == map_allocated)
921 compactor->maps = x2nrealloc (compactor->maps, &map_allocated,
922 sizeof *compactor->maps);
923 map = &compactor->maps[compactor->map_cnt++];
924 map->src_idx = v->fv;
925 map->dst_idx = value_idx;
934 /* Compacts SRC by copying it to DST according to the scheme in
937 Compacting a case eliminates "holes" between values and after
938 the last value. Holes are created by deleting variables (or
939 by scratch variables). */
941 dict_compactor_compact (const struct dict_compactor *compactor,
942 struct ccase *dst, const struct ccase *src)
946 for (i = 0; i < compactor->map_cnt; i++)
948 const struct copy_map *map = &compactor->maps[i];
949 case_copy (dst, map->dst_idx, src, map->src_idx, map->cnt);
953 /* Destroys COMPACTOR. */
955 dict_compactor_destroy (struct dict_compactor *compactor)
957 if (compactor != NULL)
959 free (compactor->maps);
964 /* Returns the SPLIT FILE vars (see cmd_split_file()). Call
965 dict_get_split_cnt() to determine how many SPLIT FILE vars
966 there are. Returns a null pointer if and only if there are no
968 struct variable *const *
969 dict_get_split_vars (const struct dictionary *d)
976 /* Returns the number of SPLIT FILE vars. */
978 dict_get_split_cnt (const struct dictionary *d)
985 /* Sets CNT split vars SPLIT in dictionary D. */
987 dict_set_split_vars (struct dictionary *d,
988 struct variable *const *split, size_t cnt)
991 assert (cnt == 0 || split != NULL);
994 d->split = xnrealloc (d->split, cnt, sizeof *d->split);
995 memcpy (d->split, split, cnt * sizeof *d->split);
998 /* Returns the file label for D, or a null pointer if D is
999 unlabeled (see cmd_file_label()). */
1001 dict_get_label (const struct dictionary *d)
1008 /* Sets D's file label to LABEL, truncating it to a maximum of 60
1011 dict_set_label (struct dictionary *d, const char *label)
1018 else if (strlen (label) < 60)
1019 d->label = xstrdup (label);
1022 d->label = xmalloc (61);
1023 memcpy (d->label, label, 60);
1024 d->label[60] = '\0';
1028 /* Returns the documents for D, or a null pointer if D has no
1029 documents (see cmd_document()).. */
1031 dict_get_documents (const struct dictionary *d)
1035 return d->documents;
1038 /* Sets the documents for D to DOCUMENTS, or removes D's
1039 documents if DOCUMENT is a null pointer. */
1041 dict_set_documents (struct dictionary *d, const char *documents)
1045 free (d->documents);
1046 if (documents == NULL)
1047 d->documents = NULL;
1049 d->documents = xstrdup (documents);
1052 /* Creates in D a vector named NAME that contains CNT variables
1053 VAR (see cmd_vector()). Returns true if successful, or
1054 false if a vector named NAME already exists in D. */
1056 dict_create_vector (struct dictionary *d,
1058 struct variable **var, size_t cnt)
1060 struct vector *vector;
1064 assert (name != NULL);
1065 assert (var_is_valid_name (name, false));
1066 assert (var != NULL);
1069 if (dict_lookup_vector (d, name) != NULL)
1072 d->vector = xnrealloc (d->vector, d->vector_cnt + 1, sizeof *d->vector);
1073 vector = d->vector[d->vector_cnt] = xmalloc (sizeof *vector);
1074 vector->idx = d->vector_cnt++;
1075 str_copy_trunc (vector->name, sizeof vector->name, name);
1076 vector->var = xnmalloc (cnt, sizeof *var);
1077 for (i = 0; i < cnt; i++)
1079 assert (dict_contains_var (d, var[i]));
1080 vector->var[i] = var[i];
1087 /* Returns the vector in D with index IDX, which must be less
1088 than dict_get_vector_cnt (D). */
1089 const struct vector *
1090 dict_get_vector (const struct dictionary *d, size_t idx)
1093 assert (idx < d->vector_cnt);
1095 return d->vector[idx];
1098 /* Returns the number of vectors in D. */
1100 dict_get_vector_cnt (const struct dictionary *d)
1104 return d->vector_cnt;
1107 /* Looks up and returns the vector within D with the given
1109 const struct vector *
1110 dict_lookup_vector (const struct dictionary *d, const char *name)
1115 assert (name != NULL);
1117 for (i = 0; i < d->vector_cnt; i++)
1118 if (!strcasecmp (d->vector[i]->name, name))
1119 return d->vector[i];
1123 /* Deletes all vectors from D. */
1125 dict_clear_vectors (struct dictionary *d)
1131 for (i = 0; i < d->vector_cnt; i++)
1133 free (d->vector[i]->var);
1134 free (d->vector[i]);
1141 /* Compares two strings. */
1143 compare_strings (const void *a, const void *b, void *aux UNUSED)
1145 return strcmp (a, b);
1148 /* Hashes a string. */
1150 hash_string (const void *s, void *aux UNUSED)
1152 return hsh_hash_string (s);
1155 /* Assigns a valid, unique short_name[] to each variable in D.
1156 Each variable whose actual name is short has highest priority
1157 for that short name. Otherwise, variables with an existing
1158 short_name[] have the next highest priority for a given short
1159 name; if it is already taken, then the variable is treated as
1160 if short_name[] had been empty. Otherwise, long names are
1161 truncated to form short names. If that causes conflicts,
1162 variables are renamed as PREFIX_A, PREFIX_B, and so on. */
1164 dict_assign_short_names (struct dictionary *d)
1166 struct hsh_table *short_names;
1169 /* Give variables whose names are short the corresponding short
1170 names, and clear short_names[] that conflict with a variable
1172 for (i = 0; i < d->var_cnt; i++)
1174 struct variable *v = d->var[i];
1175 if (strlen (v->name) <= SHORT_NAME_LEN)
1176 var_set_short_name (v, v->name);
1177 else if (dict_lookup_var (d, v->short_name) != NULL)
1178 var_clear_short_name (v);
1181 /* Each variable with an assigned short_name[] now gets it
1182 unless there is a conflict. */
1183 short_names = hsh_create (d->var_cnt, compare_strings, hash_string,
1185 for (i = 0; i < d->var_cnt; i++)
1187 struct variable *v = d->var[i];
1188 if (v->short_name[0] && hsh_insert (short_names, v->short_name) != NULL)
1189 var_clear_short_name (v);
1192 /* Now assign short names to remaining variables. */
1193 for (i = 0; i < d->var_cnt; i++)
1195 struct variable *v = d->var[i];
1196 if (v->short_name[0] == '\0')
1200 /* Form initial short_name. */
1201 var_set_short_name (v, v->name);
1203 /* Try _A, _B, ... _AA, _AB, etc., if needed. */
1204 for (sfx = 0; hsh_insert (short_names, v->short_name) != NULL; sfx++)
1205 var_set_short_name_suffix (v, v->name, sfx);
1209 /* Get rid of hash table. */
1210 hsh_destroy (short_names);