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
22 #include "dictionary.h"
28 #include "cat-routines.h"
31 #include "value-labels.h"
33 #include <libpspp/alloc.h>
34 #include <libpspp/array.h>
35 #include <libpspp/compiler.h>
36 #include <libpspp/hash.h>
37 #include <libpspp/message.h>
38 #include <libpspp/misc.h>
39 #include <libpspp/str.h>
42 #define _(msgid) gettext (msgid)
47 struct variable **var; /* Variables. */
48 size_t var_cnt, var_cap; /* Number of variables, capacity. */
49 struct hsh_table *name_tab; /* Variable index by name. */
50 int next_value_idx; /* Index of next `union value' to allocate. */
51 struct variable **split; /* SPLIT FILE vars. */
52 size_t split_cnt; /* SPLIT FILE count. */
53 struct variable *weight; /* WEIGHT variable. */
54 struct variable *filter; /* FILTER variable. */
55 size_t case_limit; /* Current case limit (N command). */
56 char *label; /* File label. */
57 char *documents; /* Documents, as a string. */
58 struct vector **vector; /* Vectors of variables. */
59 size_t vector_cnt; /* Number of vectors. */
62 /* Creates and returns a new dictionary. */
66 struct dictionary *d = xmalloc (sizeof *d);
69 d->var_cnt = d->var_cap = 0;
70 d->name_tab = hsh_create (8, compare_var_names, hash_var_name, NULL, NULL);
71 d->next_value_idx = 0;
85 /* Creates and returns a (deep) copy of an existing
88 dict_clone (const struct dictionary *s)
97 for (i = 0; i < s->var_cnt; i++)
99 struct variable *sv = s->var[i];
100 struct variable *dv = dict_clone_var_assert (d, sv, sv->name);
101 var_set_short_name (dv, sv->short_name);
104 d->next_value_idx = s->next_value_idx;
106 d->split_cnt = s->split_cnt;
107 if (d->split_cnt > 0)
109 d->split = xnmalloc (d->split_cnt, sizeof *d->split);
110 for (i = 0; i < d->split_cnt; i++)
111 d->split[i] = dict_lookup_var_assert (d, s->split[i]->name);
114 if (s->weight != NULL)
115 d->weight = dict_lookup_var_assert (d, s->weight->name);
117 if (s->filter != NULL)
118 d->filter = dict_lookup_var_assert (d, s->filter->name);
120 d->case_limit = s->case_limit;
121 dict_set_label (d, dict_get_label (s));
122 dict_set_documents (d, dict_get_documents (s));
124 d->vector_cnt = s->vector_cnt;
125 d->vector = xnmalloc (d->vector_cnt, sizeof *d->vector);
126 for (i = 0; i < s->vector_cnt; i++)
128 struct vector *sv = s->vector[i];
129 struct vector *dv = d->vector[i] = xmalloc (sizeof *dv);
133 strcpy (dv->name, sv->name);
135 dv->var = xnmalloc (dv->cnt, sizeof *dv->var);
136 for (j = 0; j < dv->cnt; j++)
137 dv->var[j] = d->var[sv->var[j]->index];
143 /* Clears the contents from a dictionary without destroying the
144 dictionary itself. */
146 dict_clear (struct dictionary *d)
148 /* FIXME? Should we really clear case_limit, label, documents?
149 Others are necessarily cleared by deleting all the variables.*/
154 for (i = 0; i < d->var_cnt; i++)
156 struct variable *v = d->var[i];
158 val_labs_destroy (v->val_labs);
164 d->var_cnt = d->var_cap = 0;
165 hsh_clear (d->name_tab);
166 d->next_value_idx = 0;
177 dict_clear_vectors (d);
180 /* Destroys the aux data for every variable in D, by calling
181 var_clear_aux() for each variable. */
183 dict_clear_aux (struct dictionary *d)
189 for (i = 0; i < d->var_cnt; i++)
190 var_clear_aux (d->var[i]);
193 /* Clears a dictionary and destroys it. */
195 dict_destroy (struct dictionary *d)
200 hsh_destroy (d->name_tab);
205 /* Returns the number of variables in D. */
207 dict_get_var_cnt (const struct dictionary *d)
214 /* Returns the variable in D with index IDX, which must be
215 between 0 and the count returned by dict_get_var_cnt(),
218 dict_get_var (const struct dictionary *d, size_t idx)
221 assert (idx < d->var_cnt);
226 /* Sets *VARS to an array of pointers to variables in D and *CNT
227 to the number of variables in *D. All variables are returned
228 if EXCLUDE_CLASSES is 0, or it may contain one or more of (1u
229 << DC_ORDINARY), (1u << DC_SYSTEM), or (1u << DC_SCRATCH) to
230 exclude the corresponding type of variable. */
232 dict_get_vars (const struct dictionary *d, struct variable ***vars,
233 size_t *cnt, unsigned exclude_classes)
239 assert (vars != NULL);
240 assert (cnt != NULL);
241 assert ((exclude_classes & ~((1u << DC_ORDINARY)
243 | (1u << DC_SCRATCH))) == 0);
246 for (i = 0; i < d->var_cnt; i++)
247 if (!(exclude_classes & (1u << dict_class_from_id (d->var[i]->name))))
250 *vars = xnmalloc (count, sizeof **vars);
252 for (i = 0; i < d->var_cnt; i++)
253 if (!(exclude_classes & (1u << dict_class_from_id (d->var[i]->name))))
254 (*vars)[(*cnt)++] = d->var[i];
255 assert (*cnt == count);
259 /* Creates and returns a new variable in D with the given NAME
260 and WIDTH. Returns a null pointer if the given NAME would
261 duplicate that of an existing variable in the dictionary. */
263 dict_create_var (struct dictionary *d, const char *name, int width)
268 assert (name != NULL);
270 assert (width >= 0 && width <= MAX_STRING);
272 assert (var_is_plausible_name(name,0));
274 /* Make sure there's not already a variable by that name. */
275 if (dict_lookup_var (d, name) != NULL)
278 /* Allocate and initialize variable. */
279 v = xmalloc (sizeof *v);
280 str_copy_trunc (v->name, sizeof v->name, name);
281 v->type = width == 0 ? NUMERIC : ALPHA;
283 v->fv = d->next_value_idx;
284 v->nv = width == 0 ? 1 : DIV_RND_UP (width, MAX_SHORT_STRING);
285 v->leave = dict_class_from_id (v->name) == DC_SCRATCH;
286 v->index = d->var_cnt;
287 mv_init (&v->miss, width);
288 if (v->type == NUMERIC)
290 v->print = fmt_for_output (FMT_F, 8, 2);
291 v->alignment = ALIGN_RIGHT;
292 v->display_width = 8;
293 v->measure = MEASURE_SCALE;
297 v->print = fmt_for_output (FMT_A, v->width, 0);
298 v->alignment = ALIGN_LEFT;
299 v->display_width = 8;
300 v->measure = MEASURE_NOMINAL;
303 v->val_labs = val_labs_create (v->width);
305 var_clear_short_name (v);
310 /* Update dictionary. */
311 if (d->var_cnt >= d->var_cap)
313 d->var_cap = 8 + 2 * d->var_cap;
314 d->var = xnrealloc (d->var, d->var_cap, sizeof *d->var);
316 d->var[v->index] = v;
318 hsh_force_insert (d->name_tab, v);
320 d->next_value_idx += v->nv;
325 /* Creates and returns a new variable in D with the given NAME
326 and WIDTH. Assert-fails if the given NAME would duplicate
327 that of an existing variable in the dictionary. */
329 dict_create_var_assert (struct dictionary *d, const char *name, int width)
331 struct variable *v = dict_create_var (d, name, width);
336 /* Creates and returns a new variable in D with name NAME, as a
337 copy of existing variable OV, which need not be in D or in any
338 dictionary. Returns a null pointer if the given NAME would
339 duplicate that of an existing variable in the dictionary. */
341 dict_clone_var (struct dictionary *d, const struct variable *ov,
348 assert (name != NULL);
350 assert (strlen (name) >= 1);
351 assert (strlen (name) <= LONG_NAME_LEN);
353 nv = dict_create_var (d, name, ov->width);
357 /* Copy most members not copied via dict_create_var().
358 short_name[] is intentionally not copied, because there is
359 no reason to give a new variable with potentially a new name
360 the same short name. */
361 nv->leave = ov->leave;
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_, const 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 should be deleted when
439 any transformations are active on the dictionary's dataset, 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_plausible_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_plausible_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 true. The function will set warn_on_invalid to false
691 if an invalid weight is found. */
693 dict_get_case_weight (const struct dictionary *d, const struct ccase *c,
694 bool *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 = false;
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. */
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. Use
761 0 for CASE_LIMIT to indicate no limit. */
763 dict_set_case_limit (struct dictionary *d, size_t case_limit)
767 d->case_limit = case_limit;
770 /* Returns the index of the next value to be added to D. This
771 value is the number of `union value's that need to be
772 allocated to store a case for dictionary D. */
774 dict_get_next_value_idx (const struct dictionary *d)
778 return d->next_value_idx;
781 /* Returns the number of bytes needed to store a case for
784 dict_get_case_size (const struct dictionary *d)
788 return sizeof (union value) * dict_get_next_value_idx (d);
791 /* Deletes scratch variables in dictionary D and reassigns values
792 so that fragmentation is eliminated. */
794 dict_compact_values (struct dictionary *d)
798 d->next_value_idx = 0;
799 for (i = 0; i < d->var_cnt; )
801 struct variable *v = d->var[i];
803 if (dict_class_from_id (v->name) != DC_SCRATCH)
805 v->fv = d->next_value_idx;
806 d->next_value_idx += v->nv;
810 dict_delete_var (d, v);
814 /* Returns the number of values that would be used by a case if
815 dict_compact_values() were called. */
817 dict_get_compacted_value_cnt (const struct dictionary *d)
823 for (i = 0; i < d->var_cnt; i++)
824 if (dict_class_from_id (d->var[i]->name) != DC_SCRATCH)
825 cnt += d->var[i]->nv;
829 /* Creates and returns an array mapping from a dictionary index
830 to the `fv' that the corresponding variable will have after
831 calling dict_compact_values(). Scratch variables receive -1
832 for `fv' because dict_compact_values() will delete them. */
834 dict_get_compacted_idx_to_fv (const struct dictionary *d)
837 size_t next_value_idx;
840 idx_to_fv = xnmalloc (d->var_cnt, sizeof *idx_to_fv);
842 for (i = 0; i < d->var_cnt; i++)
844 struct variable *v = d->var[i];
846 if (dict_class_from_id (v->name) != DC_SCRATCH)
848 idx_to_fv[i] = next_value_idx;
849 next_value_idx += v->nv;
857 /* Returns true if a case for dictionary D would be smaller after
858 compacting, false otherwise. Compacting a case eliminates
859 "holes" between values and after the last value. Holes are
860 created by deleting variables (or by scratch variables).
862 The return value may differ from whether compacting a case
863 from dictionary D would *change* the case: compacting could
864 rearrange values even if it didn't reduce space
867 dict_compacting_would_shrink (const struct dictionary *d)
869 return dict_get_compacted_value_cnt (d) < dict_get_next_value_idx (d);
872 /* Returns true if a case for dictionary D would change after
873 compacting, false otherwise. Compacting a case eliminates
874 "holes" between values and after the last value. Holes are
875 created by deleting variables (or by scratch variables).
877 The return value may differ from whether compacting a case
878 from dictionary D would *shrink* the case: compacting could
879 rearrange values without reducing space requirements. */
881 dict_compacting_would_change (const struct dictionary *d)
887 for (i = 0; i < dict_get_var_cnt (d); i++)
889 struct variable *v = dict_get_var (d, i);
890 if (v->fv != case_idx)
897 /* How to copy a contiguous range of values between cases. */
900 size_t src_idx; /* Starting value index in source case. */
901 size_t dst_idx; /* Starting value index in target case. */
902 size_t cnt; /* Number of values. */
905 /* How to compact a case. */
906 struct dict_compactor
908 struct copy_map *maps; /* Array of mappings. */
909 size_t map_cnt; /* Number of mappings. */
912 /* Creates and returns a dict_compactor that can be used to
913 compact cases for dictionary D.
915 Compacting a case eliminates "holes" between values and after
916 the last value. Holes are created by deleting variables (or
917 by scratch variables). */
918 struct dict_compactor *
919 dict_make_compactor (const struct dictionary *d)
921 struct dict_compactor *compactor;
922 struct copy_map *map;
923 size_t map_allocated;
927 compactor = xmalloc (sizeof *compactor);
928 compactor->maps = NULL;
929 compactor->map_cnt = 0;
934 for (i = 0; i < d->var_cnt; i++)
936 struct variable *v = d->var[i];
938 if (dict_class_from_id (v->name) == DC_SCRATCH)
940 if (map != NULL && map->src_idx + map->cnt == v->fv)
944 if (compactor->map_cnt == map_allocated)
945 compactor->maps = x2nrealloc (compactor->maps, &map_allocated,
946 sizeof *compactor->maps);
947 map = &compactor->maps[compactor->map_cnt++];
948 map->src_idx = v->fv;
949 map->dst_idx = value_idx;
958 /* Compacts SRC by copying it to DST according to the scheme in
961 Compacting a case eliminates "holes" between values and after
962 the last value. Holes are created by deleting variables (or
963 by scratch variables). */
965 dict_compactor_compact (const struct dict_compactor *compactor,
966 struct ccase *dst, const struct ccase *src)
970 for (i = 0; i < compactor->map_cnt; i++)
972 const struct copy_map *map = &compactor->maps[i];
973 case_copy (dst, map->dst_idx, src, map->src_idx, map->cnt);
977 /* Destroys COMPACTOR. */
979 dict_compactor_destroy (struct dict_compactor *compactor)
981 if (compactor != NULL)
983 free (compactor->maps);
988 /* Returns the SPLIT FILE vars (see cmd_split_file()). Call
989 dict_get_split_cnt() to determine how many SPLIT FILE vars
990 there are. Returns a null pointer if and only if there are no
992 struct variable *const *
993 dict_get_split_vars (const struct dictionary *d)
1000 /* Returns the number of SPLIT FILE vars. */
1002 dict_get_split_cnt (const struct dictionary *d)
1006 return d->split_cnt;
1009 /* Sets CNT split vars SPLIT in dictionary D. */
1011 dict_set_split_vars (struct dictionary *d,
1012 struct variable *const *split, size_t cnt)
1015 assert (cnt == 0 || split != NULL);
1018 d->split = xnrealloc (d->split, cnt, sizeof *d->split);
1019 memcpy (d->split, split, cnt * sizeof *d->split);
1022 /* Returns the file label for D, or a null pointer if D is
1023 unlabeled (see cmd_file_label()). */
1025 dict_get_label (const struct dictionary *d)
1032 /* Sets D's file label to LABEL, truncating it to a maximum of 60
1035 dict_set_label (struct dictionary *d, const char *label)
1042 else if (strlen (label) < 60)
1043 d->label = xstrdup (label);
1046 d->label = xmalloc (61);
1047 memcpy (d->label, label, 60);
1048 d->label[60] = '\0';
1052 /* Returns the documents for D, or a null pointer if D has no
1053 documents (see cmd_document()).. */
1055 dict_get_documents (const struct dictionary *d)
1059 return d->documents;
1062 /* Sets the documents for D to DOCUMENTS, or removes D's
1063 documents if DOCUMENT is a null pointer. */
1065 dict_set_documents (struct dictionary *d, const char *documents)
1069 free (d->documents);
1070 if (documents == NULL)
1071 d->documents = NULL;
1073 d->documents = xstrdup (documents);
1076 /* Creates in D a vector named NAME that contains CNT variables
1077 VAR (see cmd_vector()). Returns true if successful, or
1078 false if a vector named NAME already exists in D. */
1080 dict_create_vector (struct dictionary *d,
1082 struct variable **var, size_t cnt)
1084 struct vector *vector;
1088 assert (name != NULL);
1089 assert (var_is_plausible_name (name, false));
1090 assert (var != NULL);
1093 if (dict_lookup_vector (d, name) != NULL)
1096 d->vector = xnrealloc (d->vector, d->vector_cnt + 1, sizeof *d->vector);
1097 vector = d->vector[d->vector_cnt] = xmalloc (sizeof *vector);
1098 vector->idx = d->vector_cnt++;
1099 str_copy_trunc (vector->name, sizeof vector->name, name);
1100 vector->var = xnmalloc (cnt, sizeof *var);
1101 for (i = 0; i < cnt; i++)
1103 assert (dict_contains_var (d, var[i]));
1104 vector->var[i] = var[i];
1111 /* Returns the vector in D with index IDX, which must be less
1112 than dict_get_vector_cnt (D). */
1113 const struct vector *
1114 dict_get_vector (const struct dictionary *d, size_t idx)
1117 assert (idx < d->vector_cnt);
1119 return d->vector[idx];
1122 /* Returns the number of vectors in D. */
1124 dict_get_vector_cnt (const struct dictionary *d)
1128 return d->vector_cnt;
1131 /* Looks up and returns the vector within D with the given
1133 const struct vector *
1134 dict_lookup_vector (const struct dictionary *d, const char *name)
1139 assert (name != NULL);
1141 for (i = 0; i < d->vector_cnt; i++)
1142 if (!strcasecmp (d->vector[i]->name, name))
1143 return d->vector[i];
1147 /* Deletes all vectors from D. */
1149 dict_clear_vectors (struct dictionary *d)
1155 for (i = 0; i < d->vector_cnt; i++)
1157 free (d->vector[i]->var);
1158 free (d->vector[i]);
1165 /* Compares two strings. */
1167 compare_strings (const void *a, const void *b, const void *aux UNUSED)
1169 return strcmp (a, b);
1172 /* Hashes a string. */
1174 hash_string (const void *s, const void *aux UNUSED)
1176 return hsh_hash_string (s);
1179 /* Assigns a valid, unique short_name[] to each variable in D.
1180 Each variable whose actual name is short has highest priority
1181 for that short name. Otherwise, variables with an existing
1182 short_name[] have the next highest priority for a given short
1183 name; if it is already taken, then the variable is treated as
1184 if short_name[] had been empty. Otherwise, long names are
1185 truncated to form short names. If that causes conflicts,
1186 variables are renamed as PREFIX_A, PREFIX_B, and so on. */
1188 dict_assign_short_names (struct dictionary *d)
1190 struct hsh_table *short_names;
1193 /* Give variables whose names are short the corresponding short
1194 names, and clear short_names[] that conflict with a variable
1196 for (i = 0; i < d->var_cnt; i++)
1198 struct variable *v = d->var[i];
1199 if (strlen (v->name) <= SHORT_NAME_LEN)
1200 var_set_short_name (v, v->name);
1201 else if (dict_lookup_var (d, v->short_name) != NULL)
1202 var_clear_short_name (v);
1205 /* Each variable with an assigned short_name[] now gets it
1206 unless there is a conflict. */
1207 short_names = hsh_create (d->var_cnt, compare_strings, hash_string,
1209 for (i = 0; i < d->var_cnt; i++)
1211 struct variable *v = d->var[i];
1212 if (v->short_name[0] && hsh_insert (short_names, v->short_name) != NULL)
1213 var_clear_short_name (v);
1216 /* Now assign short names to remaining variables. */
1217 for (i = 0; i < d->var_cnt; i++)
1219 struct variable *v = d->var[i];
1220 if (v->short_name[0] == '\0')
1224 /* Form initial short_name. */
1225 var_set_short_name (v, v->name);
1227 /* Try _A, _B, ... _AA, _AB, etc., if needed. */
1228 for (sfx = 0; hsh_insert (short_names, v->short_name) != NULL; sfx++)
1229 var_set_short_name_suffix (v, v->name, sfx);
1233 /* Get rid of hash table. */
1234 hsh_destroy (short_names);