1 /* PSPP - computes sample statistics.
2 Copyright (C) 1997-9, 2000 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., 59 Temple Place - Suite 330, Boston, MA
21 #include "dictionary.h"
23 #include "algorithm.h"
30 #include "value-labels.h"
36 struct variable **var; /* Variables. */
37 size_t var_cnt, var_cap; /* Number of variables, capacity. */
38 struct hsh_table *name_tab; /* Variable index by name. */
39 int next_value_idx; /* Index of next `union value' to allocate. */
40 struct variable **split; /* SPLIT FILE vars. */
41 size_t split_cnt; /* SPLIT FILE count. */
42 struct variable *weight; /* WEIGHT variable. */
43 struct variable *filter; /* FILTER variable. */
44 int case_limit; /* Current case limit (N command). */
45 char *label; /* File label. */
46 char *documents; /* Documents, as a string. */
47 struct vector **vector; /* Vectors of variables. */
48 size_t vector_cnt; /* Number of vectors. */
51 /* Creates and returns a new dictionary. */
55 struct dictionary *d = xmalloc (sizeof *d);
58 d->var_cnt = d->var_cap = 0;
59 d->name_tab = hsh_create (8, compare_variables, hash_variable, NULL, NULL);
60 d->next_value_idx = 0;
74 /* Creates and returns a (deep) copy of an existing
77 dict_clone (const struct dictionary *s)
85 for (i = 0; i < s->var_cnt; i++)
86 dict_clone_var (d, s->var[i], s->var[i]->name);
87 d->next_value_idx = s->next_value_idx;
89 d->split_cnt = s->split_cnt;
92 d->split = xmalloc (d->split_cnt * sizeof *d->split);
93 for (i = 0; i < d->split_cnt; i++)
94 d->split[i] = dict_lookup_var_assert (d, s->split[i]->name);
97 if (s->weight != NULL)
98 d->weight = dict_lookup_var_assert (d, s->weight->name);
100 if (s->filter != NULL)
101 d->filter = dict_lookup_var_assert (d, s->filter->name);
103 d->case_limit = s->case_limit;
104 dict_set_label (d, dict_get_label (s));
105 dict_set_documents (d, dict_get_documents (s));
107 for (i = 0; i < s->vector_cnt; i++)
108 dict_create_vector (d, s->vector[i]->name,
109 s->vector[i]->var, s->vector[i]->cnt);
114 /* Clears the contents from a dictionary without destroying the
115 dictionary itself. */
117 dict_clear (struct dictionary *d)
119 /* FIXME? Should we really clear case_limit, label, documents?
120 Others are necessarily cleared by deleting all the variables.*/
125 for (i = 0; i < d->var_cnt; i++)
127 struct variable *v = d->var[i];
129 val_labs_destroy (v->val_labs);
135 d->var_cnt = d->var_cap = 0;
136 hsh_clear (d->name_tab);
137 d->next_value_idx = 0;
148 dict_clear_vectors (d);
151 /* Destroys the aux data for every variable in D, by calling
152 var_clear_aux() for each variable. */
154 dict_clear_aux (struct dictionary *d)
160 for (i = 0; i < d->var_cnt; i++)
161 var_clear_aux (d->var[i]);
164 /* Clears a dictionary and destroys it. */
166 dict_destroy (struct dictionary *d)
171 hsh_destroy (d->name_tab);
176 /* Returns the number of variables in D. */
178 dict_get_var_cnt (const struct dictionary *d)
185 /* Returns the variable in D with index IDX, which must be
186 between 0 and the count returned by dict_get_var_cnt(),
189 dict_get_var (const struct dictionary *d, size_t idx)
192 assert (idx < d->var_cnt);
197 /* Sets *VARS to an array of pointers to variables in D and *CNT
198 to the number of variables in *D. By default all variables
199 are returned, but bits may be set in EXCLUDE_CLASSES to
200 exclude ordinary, system, and/or scratch variables. */
202 dict_get_vars (const struct dictionary *d, struct variable ***vars,
203 size_t *cnt, unsigned exclude_classes)
209 assert (vars != NULL);
210 assert (cnt != NULL);
211 assert ((exclude_classes & ~((1u << DC_ORDINARY)
213 | (1u << DC_SCRATCH))) == 0);
216 for (i = 0; i < d->var_cnt; i++)
217 if (!(exclude_classes & (1u << dict_class_from_id (d->var[i]->name))))
220 *vars = xmalloc (count * sizeof **vars);
222 for (i = 0; i < d->var_cnt; i++)
223 if (!(exclude_classes & (1u << dict_class_from_id (d->var[i]->name))))
224 (*vars)[(*cnt)++] = d->var[i];
225 assert (*cnt == count);
228 /* Creates and returns a new variable in D with the given NAME
229 and WIDTH. Returns a null pointer if the given NAME would
230 duplicate that of an existing variable in the dictionary. */
232 dict_create_var (struct dictionary *d, const char *name, int width)
237 assert (name != NULL);
238 assert (strlen (name) >= 1 && strlen (name) <= 8);
239 assert (width >= 0 && width < 256);
241 /* Make sure there's not already a variable by that name. */
242 if (dict_lookup_var (d, name) != NULL)
245 /* Allocate and initialize variable. */
246 v = xmalloc (sizeof *v);
247 strncpy (v->name, name, sizeof v->name);
249 v->index = d->var_cnt;
250 v->type = width == 0 ? NUMERIC : ALPHA;
252 v->fv = d->next_value_idx;
253 v->nv = width == 0 ? 1 : DIV_RND_UP (width, 8);
255 v->reinit = dict_class_from_id (name) != DC_SCRATCH;
256 v->miss_type = MISSING_NONE;
257 if (v->type == NUMERIC)
259 v->print.type = FMT_F;
265 v->print.type = FMT_A;
266 v->print.w = v->width;
270 v->val_labs = val_labs_create (v->width);
275 /* Update dictionary. */
276 if (d->var_cnt >= d->var_cap)
278 d->var_cap = 8 + 2 * d->var_cap;
279 d->var = xrealloc (d->var, d->var_cap * sizeof *d->var);
281 d->var[v->index] = v;
283 hsh_force_insert (d->name_tab, v);
284 d->next_value_idx += v->nv;
289 /* Creates and returns a new variable in D with the given NAME
290 and WIDTH. Assert-fails if the given NAME would duplicate
291 that of an existing variable in the dictionary. */
293 dict_create_var_assert (struct dictionary *d, const char *name, int width)
295 struct variable *v = dict_create_var (d, name, width);
300 /* Creates a new variable in D named NAME, as a copy of existing
301 variable OV, which need not be in D or in any dictionary. */
303 dict_clone_var (struct dictionary *d, const struct variable *ov,
310 assert (name != NULL);
311 assert (strlen (name) >= 1 && strlen (name) <= 8);
313 nv = dict_create_var (d, name, ov->width);
318 nv->reinit = ov->reinit;
319 nv->miss_type = ov->miss_type;
320 memcpy (nv->missing, ov->missing, sizeof nv->missing);
321 nv->print = ov->print;
322 nv->write = ov->write;
323 val_labs_destroy (nv->val_labs);
324 nv->val_labs = val_labs_copy (ov->val_labs);
325 if (ov->label != NULL)
326 nv->label = xstrdup (ov->label);
331 /* Changes the name of V in D to name NEW_NAME. Assert-fails if
332 a variable named NEW_NAME is already in D, except that
333 NEW_NAME may be the same as V's existing name. */
335 dict_rename_var (struct dictionary *d, struct variable *v,
336 const char *new_name)
340 assert (new_name != NULL);
341 assert (strlen (new_name) >= 1 && strlen (new_name) <= 8);
342 assert (dict_contains_var (d, v));
344 if (!strcmp (v->name, new_name))
347 assert (dict_lookup_var (d, new_name) == NULL);
349 hsh_force_delete (d->name_tab, v);
350 strncpy (v->name, new_name, sizeof v->name);
352 hsh_force_insert (d->name_tab, v);
355 /* Returns the variable named NAME in D, or a null pointer if no
356 variable has that name. */
358 dict_lookup_var (const struct dictionary *d, const char *name)
363 assert (name != NULL);
364 assert (strlen (name) >= 1 && strlen (name) <= 8);
366 strncpy (v.name, name, sizeof v.name);
369 return hsh_find (d->name_tab, &v);
372 /* Returns the variable named NAME in D. Assert-fails if no
373 variable has that name. */
375 dict_lookup_var_assert (const struct dictionary *d, const char *name)
377 struct variable *v = dict_lookup_var (d, name);
382 /* Returns nonzero if variable V is in dictionary D. */
384 dict_contains_var (const struct dictionary *d, const struct variable *v)
389 return v->index >= 0 && v->index < d->var_cnt && d->var[v->index] == v;
392 /* Compares two double pointers to variables, which should point
393 to elements of a struct dictionary's `var' member array. */
395 compare_variable_dblptrs (const void *a_, const void *b_, void *aux UNUSED)
397 struct variable *const *a = a_;
398 struct variable *const *b = b_;
408 /* Deletes variable V from dictionary D and frees V.
410 This is a very bad idea if there might be any pointers to V
411 from outside D. In general, no variable in default_dict
412 should be deleted when any transformations are active, because
413 those transformations might reference the deleted variable.
414 The safest time to delete a variable is just after a procedure
415 has been executed, as done by MODIFY VARS.
417 Pointers to V within D are not a problem, because
418 dict_delete_var() knows to remove V from split variables,
419 weights, filters, etc. */
421 dict_delete_var (struct dictionary *d, struct variable *v)
427 assert (dict_contains_var (d, v));
428 assert (d->var[v->index] == v);
430 /* Delete aux data. */
433 /* Remove V from splits, weight, filter variables. */
434 d->split_cnt = remove_equal (d->split, d->split_cnt, sizeof *d->split,
436 compare_variable_dblptrs, NULL);
441 dict_clear_vectors (d);
443 /* Remove V from var array. */
445 memmove (d->var + v->index, d->var + v->index + 1,
446 (d->var_cnt - v->index) * sizeof *d->var);
449 for (i = v->index; i < d->var_cnt; i++)
450 d->var[i]->index = i;
452 /* Update name hash. */
453 hsh_force_delete (d->name_tab, v);
456 val_labs_destroy (v->val_labs);
461 /* Deletes the COUNT variables listed in VARS from D. This is
462 unsafe; see the comment on dict_delete_var() for details. */
464 dict_delete_vars (struct dictionary *d,
465 struct variable *const *vars, size_t count)
467 /* FIXME: this can be done in O(count) time, but this algorithm
470 assert (count == 0 || vars != NULL);
473 dict_delete_var (d, *vars++);
476 /* Reorders the variables in D, placing the COUNT variables
477 listed in ORDER in that order at the beginning of D. The
478 other variables in D, if any, retain their relative
481 dict_reorder_vars (struct dictionary *d,
482 struct variable *const *order, size_t count)
484 struct variable **new_var;
488 assert (count == 0 || order != NULL);
489 assert (count <= d->var_cnt);
491 new_var = xmalloc (d->var_cnt * sizeof *new_var);
492 memcpy (new_var, order, count * sizeof *new_var);
493 for (i = 0; i < count; i++)
495 assert (d->var[order[i]->index] != NULL);
496 d->var[order[i]->index] = NULL;
499 for (i = 0; i < d->var_cnt; i++)
500 if (d->var[i] != NULL)
502 assert (count < d->var_cnt);
503 new_var[count] = d->var[i];
504 new_var[count]->index = count;
511 /* Renames COUNT variables specified in VARS to the names given
512 in NEW_NAMES within dictionary D. If the renaming would
513 result in a duplicate variable name, returns zero and stores a
514 name that would be duplicated into *ERR_NAME (if ERR_NAME is
515 non-null). Otherwise, the renaming is successful, and nonzero
518 dict_rename_vars (struct dictionary *d,
519 struct variable **vars, char **new_names,
520 size_t count, char **err_name)
527 assert (count == 0 || vars != NULL);
528 assert (count == 0 || new_names != NULL);
530 old_names = xmalloc (count * sizeof *old_names);
531 for (i = 0; i < count; i++)
533 assert (d->var[vars[i]->index] == vars[i]);
534 hsh_force_delete (d->name_tab, vars[i]);
535 old_names[i] = xstrdup (vars[i]->name);
538 for (i = 0; i < count; i++)
540 assert (new_names[i] != NULL);
541 assert (*new_names[i] != '\0');
542 assert (strlen (new_names[i]) < 9);
543 strcpy (vars[i]->name, new_names[i]);
544 if (hsh_insert (d->name_tab, vars[i]) != NULL)
547 if (err_name != NULL)
548 *err_name = new_names[i];
550 for (i = 0; i < fail_idx; i++)
551 hsh_force_delete (d->name_tab, vars[i]);
553 for (i = 0; i < count; i++)
555 strcpy (vars[i]->name, old_names[i]);
556 hsh_force_insert (d->name_tab, vars[i]);
564 for (i = 0; i < count; i++)
571 /* Returns the weighting variable in dictionary D, or a null
572 pointer if the dictionary is unweighted. */
574 dict_get_weight (const struct dictionary *d)
577 assert (d->weight == NULL || dict_contains_var (d, d->weight));
582 /* Returns the value of D's weighting variable in case C, except that a
583 negative weight is returned as 0. Returns 1 if the dictionary is
584 unweighted. Will warn about missing, negative, or zero values if
585 warn_on_invalid is nonzero. The function will set warn_on_invalid to zero
586 if an invalid weight is found. */
588 dict_get_case_weight (const struct dictionary *d, const struct ccase *c,
589 int *warn_on_invalid)
594 if (d->weight == NULL)
598 double w = case_num (c, d->weight->fv);
599 if ( w < 0.0 || w == SYSMIS || is_num_user_missing(w, d->weight) )
601 if ( w == 0.0 && *warn_on_invalid ) {
602 *warn_on_invalid = 0;
603 msg (SW, _("At least one case in the data file had a weight value "
604 "that was user-missing, system-missing, zero, or "
605 "negative. These case(s) were ignored."));
611 /* Sets the weighting variable of D to V, or turning off
612 weighting if V is a null pointer. */
614 dict_set_weight (struct dictionary *d, struct variable *v)
617 assert (v == NULL || dict_contains_var (d, v));
618 assert (v == NULL || v->type == NUMERIC);
623 /* Returns the filter variable in dictionary D (see cmd_filter())
624 or a null pointer if the dictionary is unfiltered. */
626 dict_get_filter (const struct dictionary *d)
629 assert (d->filter == NULL || dict_contains_var (d, d->filter));
634 /* Sets V as the filter variable for dictionary D. Passing a
635 null pointer for V turn off filtering. */
637 dict_set_filter (struct dictionary *d, struct variable *v)
640 assert (v == NULL || dict_contains_var (d, v));
645 /* Returns the case limit for dictionary D, or zero if the number
646 of cases is unlimited (see cmd_n()). */
648 dict_get_case_limit (const struct dictionary *d)
652 return d->case_limit;
655 /* Sets CASE_LIMIT as the case limit for dictionary D. Zero for
656 CASE_LIMIT indicates no limit. */
658 dict_set_case_limit (struct dictionary *d, int case_limit)
661 assert (case_limit >= 0);
663 d->case_limit = case_limit;
666 /* Returns the index of the next value to be added to D. This
667 value is the number of `union value's that need to be
668 allocated to store a case for dictionary D. */
670 dict_get_next_value_idx (const struct dictionary *d)
674 return d->next_value_idx;
677 /* Returns the number of bytes needed to store a case for
680 dict_get_case_size (const struct dictionary *d)
684 return sizeof (union value) * dict_get_next_value_idx (d);
687 /* Deletes scratch variables in dictionary D and reassigns values
688 so that fragmentation is eliminated. */
690 dict_compact_values (struct dictionary *d)
694 d->next_value_idx = 0;
695 for (i = 0; i < d->var_cnt; )
697 struct variable *v = d->var[i];
699 if (dict_class_from_id (v->name) != DC_SCRATCH)
701 v->fv = d->next_value_idx;
702 d->next_value_idx += v->nv;
706 dict_delete_var (default_dict, v);
710 /* Returns the number of values that would be used by a case if
711 dict_compact_values() were called. */
713 dict_get_compacted_value_cnt (const struct dictionary *d)
719 for (i = 0; i < d->var_cnt; i++)
720 if (dict_class_from_id (d->var[i]->name) != DC_SCRATCH)
721 cnt += d->var[i]->nv;
725 /* Creates and returns an array mapping from a dictionary index
726 to the `fv' that the corresponding variable will have after
727 calling dict_compact_values(). Scratch variables receive -1
728 for `fv' because dict_compact_values() will delete them. */
730 dict_get_compacted_idx_to_fv (const struct dictionary *d)
733 size_t next_value_idx;
736 idx_to_fv = xmalloc (d->var_cnt * sizeof *idx_to_fv);
738 for (i = 0; i < d->var_cnt; i++)
740 struct variable *v = d->var[i];
742 if (dict_class_from_id (v->name) != DC_SCRATCH)
744 idx_to_fv[i] = next_value_idx;
745 next_value_idx += v->nv;
753 /* Returns the SPLIT FILE vars (see cmd_split_file()). Call
754 dict_get_split_cnt() to determine how many SPLIT FILE vars
755 there are. Returns a null pointer if and only if there are no
757 struct variable *const *
758 dict_get_split_vars (const struct dictionary *d)
765 /* Returns the number of SPLIT FILE vars. */
767 dict_get_split_cnt (const struct dictionary *d)
774 /* Sets CNT split vars SPLIT in dictionary D. */
776 dict_set_split_vars (struct dictionary *d,
777 struct variable *const *split, size_t cnt)
780 assert (cnt == 0 || split != NULL);
783 d->split = xrealloc (d->split, cnt * sizeof *d->split);
784 memcpy (d->split, split, cnt * sizeof *d->split);
787 /* Returns the file label for D, or a null pointer if D is
788 unlabeled (see cmd_file_label()). */
790 dict_get_label (const struct dictionary *d)
797 /* Sets D's file label to LABEL, truncating it to a maximum of 60
800 dict_set_label (struct dictionary *d, const char *label)
807 else if (strlen (label) < 60)
808 d->label = xstrdup (label);
811 d->label = xmalloc (61);
812 memcpy (d->label, label, 60);
817 /* Returns the documents for D, or a null pointer if D has no
818 documents (see cmd_document()).. */
820 dict_get_documents (const struct dictionary *d)
827 /* Sets the documents for D to DOCUMENTS, or removes D's
828 documents if DOCUMENT is a null pointer. */
830 dict_set_documents (struct dictionary *d, const char *documents)
835 if (documents == NULL)
838 d->documents = xstrdup (documents);
841 /* Creates in D a vector named NAME that contains CNT variables
842 VAR (see cmd_vector()). Returns nonzero if successful, or
843 zero if a vector named NAME already exists in D. */
845 dict_create_vector (struct dictionary *d,
847 struct variable **var, size_t cnt)
849 struct vector *vector;
852 assert (name != NULL);
853 assert (strlen (name) > 0 && strlen (name) < 9);
854 assert (var != NULL);
857 if (dict_lookup_vector (d, name) != NULL)
860 d->vector = xrealloc (d->vector, (d->vector_cnt + 1) * sizeof *d->vector);
861 vector = d->vector[d->vector_cnt] = xmalloc (sizeof *vector);
862 vector->idx = d->vector_cnt++;
863 strncpy (vector->name, name, 8);
864 vector->name[8] = '\0';
865 vector->var = xmalloc (cnt * sizeof *var);
866 memcpy (vector->var, var, cnt * sizeof *var);
872 /* Returns the vector in D with index IDX, which must be less
873 than dict_get_vector_cnt (D). */
874 const struct vector *
875 dict_get_vector (const struct dictionary *d, size_t idx)
878 assert (idx < d->vector_cnt);
880 return d->vector[idx];
883 /* Returns the number of vectors in D. */
885 dict_get_vector_cnt (const struct dictionary *d)
889 return d->vector_cnt;
892 /* Looks up and returns the vector within D with the given
894 const struct vector *
895 dict_lookup_vector (const struct dictionary *d, const char *name)
900 assert (name != NULL);
902 for (i = 0; i < d->vector_cnt; i++)
903 if (!strcmp (d->vector[i]->name, name))
908 /* Deletes all vectors from D. */
910 dict_clear_vectors (struct dictionary *d)
916 for (i = 0; i < d->vector_cnt; i++)
918 free (d->vector[i]->var);