1 /* PSPP - a program for statistical analysis.
2 Copyright (C) 1997-9, 2000, 2006, 2009 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation, either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
22 #include <data/attributes.h>
23 #include <data/category.h>
24 #include <data/data-out.h>
25 #include <data/format.h>
26 #include <data/dictionary.h>
27 #include <data/identifier.h>
28 #include <data/missing-values.h>
29 #include <data/value-labels.h>
30 #include <data/vardict.h>
32 #include <libpspp/misc.h>
33 #include <libpspp/assertion.h>
34 #include <libpspp/compiler.h>
35 #include <libpspp/hash.h>
36 #include <libpspp/message.h>
37 #include <libpspp/str.h>
43 #define _(msgid) gettext (msgid)
48 /* Dictionary information. */
49 char name[VAR_NAME_LEN + 1]; /* Variable name. Mixed case. */
50 int width; /* 0 for numeric, otherwise string width. */
51 struct missing_values miss; /* Missing values. */
52 struct fmt_spec print; /* Default format for PRINT. */
53 struct fmt_spec write; /* Default format for WRITE. */
54 struct val_labs *val_labs; /* Value labels. */
55 char *label; /* Variable label. */
57 /* GUI information. */
58 enum measure measure; /* Nominal, ordinal, or continuous. */
59 int display_width; /* Width of data editor column. */
60 enum alignment alignment; /* Alignment of data in GUI. */
62 /* Case information. */
63 bool leave; /* Leave value from case to case? */
65 /* Data for use by containing dictionary. */
66 struct vardict_info vardict;
68 /* Used only for system and portable file input and output.
71 size_t short_name_cnt;
73 /* Each command may use these fields as needed. */
75 void (*aux_dtor) (struct variable *);
77 /* Values of a categorical variable. Procedures need
78 vectors with binary entries, so any variable of type ALPHA will
79 have its values stored here. */
80 struct cat_vals *obs_vals;
82 /* Custom attributes. */
83 struct attrset attributes;
86 /* Creates and returns a new variable with the given NAME and
87 WIDTH and other fields initialized to default values. The
88 variable is not added to a dictionary; for that, use
89 dict_create_var instead. */
91 var_create (const char *name, int width)
96 assert (width >= 0 && width <= MAX_STRING);
98 v = xmalloc (sizeof *v);
99 v->vardict.dict_index = v->vardict.case_index = -1;
100 var_set_name (v, name);
102 mv_init (&v->miss, width);
103 v->leave = var_must_leave (v);
104 type = val_type_from_width (width);
105 v->alignment = var_default_alignment (type);
106 v->measure = var_default_measure (type);
107 v->display_width = var_default_display_width (width);
108 v->print = v->write = var_default_formats (width);
111 v->short_names = NULL;
112 v->short_name_cnt = 0;
116 attrset_init (&v->attributes);
121 /* Creates and returns a clone of OLD_VAR. Most properties of
122 the new variable are copied from OLD_VAR, except:
124 - The variable's short name is not copied, because there is
125 no reason to give a new variable with potentially a new
126 name the same short name.
128 - The new variable is not added to OLD_VAR's dictionary by
129 default. Use dict_clone_var, instead, to do that.
131 - Auxiliary data and obs_vals are not copied. */
133 var_clone (const struct variable *old_var)
135 struct variable *new_var = var_create (var_get_name (old_var),
136 var_get_width (old_var));
138 var_set_missing_values (new_var, var_get_missing_values (old_var));
139 var_set_print_format (new_var, var_get_print_format (old_var));
140 var_set_write_format (new_var, var_get_write_format (old_var));
141 var_set_value_labels (new_var, var_get_value_labels (old_var));
142 var_set_label (new_var, var_get_label (old_var));
143 var_set_measure (new_var, var_get_measure (old_var));
144 var_set_display_width (new_var, var_get_display_width (old_var));
145 var_set_alignment (new_var, var_get_alignment (old_var));
146 var_set_leave (new_var, var_get_leave (old_var));
147 var_set_attributes (new_var, var_get_attributes (old_var));
152 /* Create a variable to be used for internal calculations only.
153 The variable is assigned a unique dictionary index and a case
154 index of CASE_IDX. */
156 var_create_internal (int case_idx)
158 struct variable *v = var_create ("$internal", 0);
159 struct vardict_info vdi;
160 static int counter = INT_MAX / 2;
163 vdi.case_index = case_idx;
164 vdi.dict_index = counter++;
165 if (counter == INT_MAX)
166 counter = INT_MAX / 2;
168 var_set_vardict (v, &vdi);
173 /* Destroys variable V.
174 V must not belong to a dictionary. If it does, use
175 dict_delete_var instead. */
177 var_destroy (struct variable *v)
181 if (var_has_vardict (v))
183 const struct vardict_info *vdi = var_get_vardict (v);
184 assert (vdi->dict == NULL);
186 cat_stored_values_destroy (v->obs_vals);
187 var_clear_short_names (v);
189 val_labs_destroy (v->val_labs);
195 /* Variable names. */
197 /* Return variable V's name. */
199 var_get_name (const struct variable *v)
204 /* Sets V's name to NAME.
205 Do not use this function for a variable in a dictionary. Use
206 dict_rename_var instead. */
208 var_set_name (struct variable *v, const char *name)
210 assert (v->vardict.dict_index == -1);
211 assert (var_is_plausible_name (name, false));
213 str_copy_trunc (v->name, sizeof v->name, name);
214 dict_var_changed (v);
217 /* Returns true if NAME is an acceptable name for a variable,
218 false otherwise. If ISSUE_ERROR is true, issues an
219 explanatory error message on failure. */
221 var_is_valid_name (const char *name, bool issue_error)
226 assert (name != NULL);
228 /* Note that strlen returns number of BYTES, not the number of
230 length = strlen (name);
232 plausible = var_is_plausible_name(name, issue_error);
238 if (!lex_is_id1 (name[0]))
241 msg (SE, _("Character `%c' (in %s) may not appear "
242 "as the first character in a variable name."),
248 for (i = 0; i < length; i++)
250 if (!lex_is_idn (name[i]))
253 msg (SE, _("Character `%c' (in %s) may not appear in "
263 /* Returns true if NAME is an plausible name for a variable,
264 false otherwise. If ISSUE_ERROR is true, issues an
265 explanatory error message on failure.
266 This function makes no use of LC_CTYPE.
269 var_is_plausible_name (const char *name, bool issue_error)
273 assert (name != NULL);
275 /* Note that strlen returns number of BYTES, not the number of
277 length = strlen (name);
281 msg (SE, _("Variable name cannot be empty string."));
284 else if (length > VAR_NAME_LEN)
287 msg (SE, _("Variable name %s exceeds %d-character limit."),
288 name, (int) VAR_NAME_LEN);
292 if (lex_id_to_token (ss_cstr (name)) != T_ID)
295 msg (SE, _("`%s' may not be used as a variable name because it "
296 "is a reserved word."), name);
303 /* Returns VAR's dictionary class. */
305 var_get_dict_class (const struct variable *var)
307 return dict_class_from_id (var->name);
310 /* A hsh_compare_func that orders variables A and B by their
313 compare_vars_by_name (const void *a_, const void *b_, const void *aux UNUSED)
315 const struct variable *a = a_;
316 const struct variable *b = b_;
318 return strcasecmp (a->name, b->name);
321 /* A hsh_hash_func that hashes variable V based on its name. */
323 hash_var_by_name (const void *v_, const void *aux UNUSED)
325 const struct variable *v = v_;
327 return hash_case_string (v->name, 0);
330 /* A hsh_compare_func that orders pointers to variables A and B
333 compare_var_ptrs_by_name (const void *a_, const void *b_,
334 const void *aux UNUSED)
336 struct variable *const *a = a_;
337 struct variable *const *b = b_;
339 return strcasecmp (var_get_name (*a), var_get_name (*b));
342 /* A hsh_compare_func that orders pointers to variables A and B
343 by their dictionary indexes. */
345 compare_var_ptrs_by_dict_index (const void *a_, const void *b_,
346 const void *aux UNUSED)
348 struct variable *const *a = a_;
349 struct variable *const *b = b_;
350 size_t a_index = var_get_dict_index (*a);
351 size_t b_index = var_get_dict_index (*b);
353 return a_index < b_index ? -1 : a_index > b_index;
356 /* A hsh_hash_func that hashes pointer to variable V based on its
359 hash_var_ptr_by_name (const void *v_, const void *aux UNUSED)
361 struct variable *const *v = v_;
363 return hash_case_string (var_get_name (*v), 0);
366 /* Returns the type of variable V. */
368 var_get_type (const struct variable *v)
370 return val_type_from_width (v->width);
373 /* Returns the width of variable V. */
375 var_get_width (const struct variable *v)
380 /* Changes the width of V to NEW_WIDTH.
381 This function should be used cautiously. */
383 var_set_width (struct variable *v, int new_width)
385 const int old_width = v->width;
387 if (old_width == new_width)
390 if (mv_is_resizable (&v->miss, new_width))
391 mv_resize (&v->miss, new_width);
393 mv_init (&v->miss, new_width);
395 if (v->val_labs != NULL)
397 if (val_labs_can_set_width (v->val_labs, new_width))
398 val_labs_set_width (v->val_labs, new_width);
401 val_labs_destroy (v->val_labs);
406 fmt_resize (&v->print, new_width);
407 fmt_resize (&v->write, new_width);
409 v->width = new_width;
410 dict_var_resized (v, old_width);
411 dict_var_changed (v);
414 /* Returns true if variable V is numeric, false otherwise. */
416 var_is_numeric (const struct variable *v)
418 return var_get_type (v) == VAL_NUMERIC;
421 /* Returns true if variable V is a string variable, false
424 var_is_alpha (const struct variable *v)
426 return var_get_type (v) == VAL_STRING;
429 /* Returns true if variable V is a short string variable, false
432 var_is_short_string (const struct variable *v)
434 return v->width > 0 && v->width <= MAX_SHORT_STRING;
437 /* Returns true if variable V is a long string variable, false
440 var_is_long_string (const struct variable *v)
442 return v->width > MAX_SHORT_STRING;
445 /* Returns variable V's missing values. */
446 const struct missing_values *
447 var_get_missing_values (const struct variable *v)
452 /* Sets variable V's missing values to MISS, which must be of V's
453 width or at least resizable to V's width.
454 If MISS is null, then V's missing values, if any, are
457 var_set_missing_values (struct variable *v, const struct missing_values *miss)
461 assert (mv_is_resizable (miss, v->width));
462 mv_copy (&v->miss, miss);
463 mv_resize (&v->miss, v->width);
466 mv_init (&v->miss, v->width);
468 dict_var_changed (v);
471 /* Sets variable V to have no user-missing values. */
473 var_clear_missing_values (struct variable *v)
475 var_set_missing_values (v, NULL);
478 /* Returns true if V has any user-missing values,
481 var_has_missing_values (const struct variable *v)
483 return !mv_is_empty (&v->miss);
486 /* Returns true if VALUE is in the given CLASS of missing values
487 in V, false otherwise. */
489 var_is_value_missing (const struct variable *v, const union value *value,
492 return mv_is_value_missing (&v->miss, value, class);
495 /* Returns true if D is in the given CLASS of missing values in
497 V must be a numeric variable. */
499 var_is_num_missing (const struct variable *v, double d, enum mv_class class)
501 return mv_is_num_missing (&v->miss, d, class);
504 /* Returns true if S[] is a missing value for V, false otherwise.
505 S[] must contain exactly as many characters as V's width.
506 V must be a string variable. */
508 var_is_str_missing (const struct variable *v, const char s[],
511 return mv_is_str_missing (&v->miss, s, class);
514 /* Returns variable V's value labels,
515 possibly a null pointer if it has none. */
516 const struct val_labs *
517 var_get_value_labels (const struct variable *v)
522 /* Returns true if variable V has at least one value label. */
524 var_has_value_labels (const struct variable *v)
526 return val_labs_count (v->val_labs) > 0;
529 /* Sets variable V's value labels to a copy of VLS,
530 which must have a width equal to V's width or one that can be
531 changed to V's width.
532 If VLS is null, then V's value labels, if any, are removed. */
534 var_set_value_labels (struct variable *v, const struct val_labs *vls)
536 val_labs_destroy (v->val_labs);
541 assert (val_labs_can_set_width (vls, v->width));
542 v->val_labs = val_labs_clone (vls);
543 val_labs_set_width (v->val_labs, v->width);
544 dict_var_changed (v);
548 /* Makes sure that V has a set of value labels,
549 by assigning one to it if necessary. */
551 alloc_value_labels (struct variable *v)
553 if (v->val_labs == NULL)
554 v->val_labs = val_labs_create (v->width);
557 /* Attempts to add a value label with the given VALUE and LABEL
558 to V. Returns true if successful, false if VALUE has an
559 existing label or if V is a long string variable. */
561 var_add_value_label (struct variable *v,
562 const union value *value, const char *label)
564 alloc_value_labels (v);
565 return val_labs_add (v->val_labs, value, label);
568 /* Adds or replaces a value label with the given VALUE and LABEL
570 Has no effect if V is a long string variable. */
572 var_replace_value_label (struct variable *v,
573 const union value *value, const char *label)
575 alloc_value_labels (v);
576 val_labs_replace (v->val_labs, value, label);
579 /* Removes V's value labels, if any. */
581 var_clear_value_labels (struct variable *v)
583 var_set_value_labels (v, NULL);
586 /* Returns the label associated with VALUE for variable V,
587 or a null pointer if none. */
589 var_lookup_value_label (const struct variable *v, const union value *value)
591 return val_labs_find (v->val_labs, value);
594 /* Append STR with a string representing VALUE for variable V.
595 That is, if VALUE has a label, append that label,
596 otherwise format VALUE and append the formatted string.
597 STR must be a pointer to an initialised struct string.
600 var_append_value_name (const struct variable *v, const union value *value,
603 const char *name = var_lookup_value_label (v, value);
606 char *s = ds_put_uninit (str, v->print.w);
607 data_out (value, &v->print, s);
610 ds_put_cstr (str, name);
613 /* Print and write formats. */
615 /* Returns V's print format specification. */
616 const struct fmt_spec *
617 var_get_print_format (const struct variable *v)
622 /* Sets V's print format specification to PRINT, which must be a
623 valid format specification for a variable of V's width
624 (ordinarily an output format, but input formats are not
627 var_set_print_format (struct variable *v, const struct fmt_spec *print)
629 assert (fmt_check_width_compat (print, v->width));
631 dict_var_changed (v);
634 /* Returns V's write format specification. */
635 const struct fmt_spec *
636 var_get_write_format (const struct variable *v)
641 /* Sets V's write format specification to WRITE, which must be a
642 valid format specification for a variable of V's width
643 (ordinarily an output format, but input formats are not
646 var_set_write_format (struct variable *v, const struct fmt_spec *write)
648 assert (fmt_check_width_compat (write, v->width));
650 dict_var_changed (v);
653 /* Sets V's print and write format specifications to FORMAT,
654 which must be a valid format specification for a variable of
655 V's width (ordinarily an output format, but input formats are
658 var_set_both_formats (struct variable *v, const struct fmt_spec *format)
660 var_set_print_format (v, format);
661 var_set_write_format (v, format);
664 /* Returns the default print and write format for a variable of
665 the given TYPE, as set by var_create. The return value can be
666 used to reset a variable's print and write formats to the
669 var_default_formats (int width)
672 ? fmt_for_output (FMT_F, 8, 2)
673 : fmt_for_output (FMT_A, width, 0));
676 /* Return a string representing this variable, in the form most
677 appropriate from a human factors perspective, that is, its
678 variable label if it has one, otherwise its name. */
680 var_to_string (const struct variable *v)
682 return v->label != NULL ? v->label : v->name;
685 /* Returns V's variable label, or a null pointer if it has none. */
687 var_get_label (const struct variable *v)
692 /* Sets V's variable label to LABEL, stripping off leading and
693 trailing white space and truncating to 255 characters.
694 If LABEL is a null pointer or if LABEL is an empty string
695 (after stripping white space), then V's variable label (if
698 var_set_label (struct variable *v, const char *label)
705 struct substring s = ss_cstr (label);
706 ss_trim (&s, ss_cstr (CC_SPACES));
707 ss_truncate (&s, 255);
708 if (!ss_is_empty (s))
709 v->label = ss_xstrdup (s);
711 dict_var_changed (v);
714 /* Removes any variable label from V. */
716 var_clear_label (struct variable *v)
718 var_set_label (v, NULL);
721 /* Returns true if V has a variable V,
724 var_has_label (const struct variable *v)
726 return v->label != NULL;
729 /* Returns true if M is a valid variable measurement level,
732 measure_is_valid (enum measure m)
734 return m == MEASURE_NOMINAL || m == MEASURE_ORDINAL || m == MEASURE_SCALE;
737 /* Returns V's measurement level. */
739 var_get_measure (const struct variable *v)
744 /* Sets V's measurement level to MEASURE. */
746 var_set_measure (struct variable *v, enum measure measure)
748 assert (measure_is_valid (measure));
749 v->measure = measure;
750 dict_var_changed (v);
753 /* Returns the default measurement level for a variable of the
754 given TYPE, as set by var_create. The return value can be
755 used to reset a variable's measurement level to the
758 var_default_measure (enum val_type type)
760 return type == VAL_NUMERIC ? MEASURE_SCALE : MEASURE_NOMINAL;
763 /* Returns V's display width, which applies only to GUIs. */
765 var_get_display_width (const struct variable *v)
767 return v->display_width;
770 /* Sets V's display width to DISPLAY_WIDTH. */
772 var_set_display_width (struct variable *v, int new_width)
774 int old_width = v->display_width;
776 v->display_width = new_width;
778 if ( old_width != new_width)
779 dict_var_display_width_changed (v);
781 dict_var_changed (v);
784 /* Returns the default display width for a variable of the given
785 WIDTH, as set by var_create. The return value can be used to
786 reset a variable's display width to the default. */
788 var_default_display_width (int width)
790 return width == 0 ? 8 : MIN (width, 32);
793 /* Returns true if A is a valid alignment,
796 alignment_is_valid (enum alignment a)
798 return a == ALIGN_LEFT || a == ALIGN_RIGHT || a == ALIGN_CENTRE;
801 /* Returns V's display alignment, which applies only to GUIs. */
803 var_get_alignment (const struct variable *v)
808 /* Sets V's display alignment to ALIGNMENT. */
810 var_set_alignment (struct variable *v, enum alignment alignment)
812 assert (alignment_is_valid (alignment));
813 v->alignment = alignment;
814 dict_var_changed (v);
817 /* Returns the default display alignment for a variable of the
818 given TYPE, as set by var_create. The return value can be
819 used to reset a variable's display alignment to the default. */
821 var_default_alignment (enum val_type type)
823 return type == VAL_NUMERIC ? ALIGN_RIGHT : ALIGN_LEFT;
826 /* Whether variables' values should be preserved from case to
829 /* Returns true if variable V's value should be left from case to
830 case, instead of being reset to system-missing or blanks. */
832 var_get_leave (const struct variable *v)
837 /* Sets V's leave setting to LEAVE. */
839 var_set_leave (struct variable *v, bool leave)
841 assert (leave || !var_must_leave (v));
843 dict_var_changed (v);
846 /* Returns true if V must be left from case to case,
847 false if it can be set either way. */
849 var_must_leave (const struct variable *v)
851 return var_get_dict_class (v) == DC_SCRATCH;
854 /* Returns the number of short names stored in VAR.
856 Short names are used only for system and portable file input
857 and output. They are upper-case only, not necessarily unique,
858 and limited to SHORT_NAME_LEN characters (plus a null
859 terminator). Ordinarily a variable has at most one short
860 name, but very long string variables (longer than 255 bytes)
861 may have more. A variable might not have any short name at
862 all if it hasn't been saved to or read from a system or
865 var_get_short_name_cnt (const struct variable *var)
867 return var->short_name_cnt;
870 /* Returns VAR's short name with the given IDX, if it has one
871 with that index, or a null pointer otherwise. Short names may
872 be sparse: even if IDX is less than the number of short names
873 in VAR, this function may return a null pointer. */
875 var_get_short_name (const struct variable *var, size_t idx)
877 return idx < var->short_name_cnt ? var->short_names[idx] : NULL;
880 /* Sets VAR's short name with the given IDX to SHORT_NAME,
881 truncating it to SHORT_NAME_LEN characters and converting it
882 to uppercase in the process. Specifying a null pointer for
883 SHORT_NAME clears the specified short name. */
885 var_set_short_name (struct variable *var, size_t idx, const char *short_name)
887 assert (var != NULL);
888 assert (short_name == NULL || var_is_plausible_name (short_name, false));
890 /* Clear old short name numbered IDX, if any. */
891 if (idx < var->short_name_cnt)
893 free (var->short_names[idx]);
894 var->short_names[idx] = NULL;
897 /* Install new short name for IDX. */
898 if (short_name != NULL)
900 if (idx >= var->short_name_cnt)
902 size_t old_cnt = var->short_name_cnt;
904 var->short_name_cnt = MAX (idx * 2, 1);
905 var->short_names = xnrealloc (var->short_names, var->short_name_cnt,
906 sizeof *var->short_names);
907 for (i = old_cnt; i < var->short_name_cnt; i++)
908 var->short_names[i] = NULL;
910 var->short_names[idx] = xstrndup (short_name, MAX_SHORT_STRING);
911 str_uppercase (var->short_names[idx]);
914 dict_var_changed (var);
917 /* Clears V's short names. */
919 var_clear_short_names (struct variable *v)
923 for (i = 0; i < v->short_name_cnt; i++)
924 free (v->short_names[i]);
925 free (v->short_names);
926 v->short_names = NULL;
927 v->short_name_cnt = 0;
930 /* Relationship with dictionary. */
932 /* Returns V's index within its dictionary, the value
933 for which "dict_get_var (dict, index)" will return V.
934 V must be in a dictionary. */
936 var_get_dict_index (const struct variable *v)
938 assert (v->vardict.dict_index != -1);
939 return v->vardict.dict_index;
942 /* Returns V's index within the case represented by its
943 dictionary, that is, the value for which "case_data_idx (case,
944 index)" will return the data for V in that case.
945 V must be in a dictionary. */
947 var_get_case_index (const struct variable *v)
949 assert (v->vardict.case_index != -1);
950 return v->vardict.case_index;
953 /* Returns V's auxiliary data, or a null pointer if none has been
956 var_get_aux (const struct variable *v)
961 /* Assign auxiliary data AUX to variable V, which must not
962 already have auxiliary data. Before V's auxiliary data is
963 cleared, AUX_DTOR(V) will be called. (var_dtor_free, below,
964 may be appropriate for use as AUX_DTOR.) */
966 var_attach_aux (const struct variable *v_,
967 void *aux, void (*aux_dtor) (struct variable *))
969 struct variable *v = (struct variable *) v_ ; /* cast away const */
970 assert (v->aux == NULL);
971 assert (aux != NULL);
973 v->aux_dtor = aux_dtor;
977 /* Remove auxiliary data, if any, from V, and return it, without
978 calling any associated destructor. */
980 var_detach_aux (struct variable *v)
983 assert (aux != NULL);
988 /* Clears auxiliary data, if any, from V, and calls any
989 associated destructor. */
991 var_clear_aux (struct variable *v)
996 if (v->aux_dtor != NULL)
1002 /* This function is appropriate for use an auxiliary data
1003 destructor (passed as AUX_DTOR to var_attach_aux()) for the
1004 case where the auxiliary data should be passed to free(). */
1006 var_dtor_free (struct variable *v)
1011 /* Observed categorical values. */
1013 /* Returns V's observed categorical values,
1014 which V must have. */
1016 var_get_obs_vals (const struct variable *v)
1018 assert (v->obs_vals != NULL);
1022 /* Sets V's observed categorical values to CAT_VALS.
1023 V becomes the owner of CAT_VALS. */
1025 var_set_obs_vals (const struct variable *v_, struct cat_vals *cat_vals)
1027 struct variable *v = (struct variable *) v_ ; /* cast away const */
1028 cat_stored_values_destroy (v->obs_vals);
1029 v->obs_vals = cat_vals;
1032 /* Returns true if V has observed categorical values,
1035 var_has_obs_vals (const struct variable *v)
1037 return v->obs_vals != NULL;
1040 /* Returns variable V's attribute set. The caller may examine or
1041 modify the attribute set, but must not destroy it. Destroying
1042 V, or calling var_set_attributes() on V, will also destroy its
1045 var_get_attributes (const struct variable *v)
1047 return (struct attrset *) &v->attributes;
1050 /* Replaces variable V's attributes set by a copy of ATTRS. */
1052 var_set_attributes (struct variable *v, const struct attrset *attrs)
1054 attrset_destroy (&v->attributes);
1055 attrset_clone (&v->attributes, attrs);
1058 /* Returns true if V has any custom attributes, false if it has none. */
1060 var_has_attributes (const struct variable *v)
1062 return attrset_count (&v->attributes) > 0;
1065 /* Returns V's vardict structure. */
1066 const struct vardict_info *
1067 var_get_vardict (const struct variable *v)
1069 assert (var_has_vardict (v));
1073 /* Sets V's vardict data to VARDICT. */
1075 var_set_vardict (struct variable *v, const struct vardict_info *vardict)
1077 assert (vardict->dict_index >= 0);
1078 assert (vardict->case_index >= 0);
1079 v->vardict = *vardict;
1082 /* Returns true if V has vardict data. */
1084 var_has_vardict (const struct variable *v)
1086 return v->vardict.dict_index != -1;
1089 /* Clears V's vardict data. */
1091 var_clear_vardict (struct variable *v)
1093 v->vardict.dict_index = v->vardict.case_index = -1;