1 /* PSPP - a program for statistical analysis.
2 Copyright (C) 1997-9, 2000, 2009, 2010, 2011, 2012, 2020 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/>. */
19 #include "language/lexer/variable-parser.h"
26 #include "data/dataset.h"
27 #include "data/dictionary.h"
28 #include "data/variable.h"
29 #include "language/lexer/lexer.h"
30 #include "libpspp/assertion.h"
31 #include "libpspp/cast.h"
32 #include "libpspp/hash-functions.h"
33 #include "libpspp/i18n.h"
34 #include "libpspp/hmapx.h"
35 #include "libpspp/message.h"
36 #include "libpspp/misc.h"
37 #include "libpspp/pool.h"
38 #include "libpspp/str.h"
39 #include "libpspp/stringi-set.h"
41 #include "math/interaction.h"
43 #include "gl/c-ctype.h"
44 #include "gl/xalloc.h"
47 #define _(msgid) gettext (msgid)
49 static struct variable *var_set_get_var (const struct var_set *, size_t);
50 static struct variable *var_set_lookup_var (const struct var_set *,
52 static bool var_set_lookup_var_idx (const struct var_set *, const char *,
54 static bool var_set_get_names_must_be_ids (const struct var_set *);
57 is_name_token (const struct lexer *lexer, bool names_must_be_ids)
59 return (lex_token (lexer) == T_ID
60 || (!names_must_be_ids && lex_token (lexer) == T_STRING));
64 is_vs_name_token (const struct lexer *lexer, const struct var_set *vs)
66 return is_name_token (lexer, var_set_get_names_must_be_ids (vs));
70 is_dict_name_token (const struct lexer *lexer, const struct dictionary *d)
72 return is_name_token (lexer, dict_get_names_must_be_ids (d));
75 /* Parses a name as a variable within VS. Sets *IDX to the
76 variable's index and returns true if successful. On failure
77 emits an error message and returns false. */
79 parse_vs_variable_idx (struct lexer *lexer, const struct var_set *vs,
84 if (!is_vs_name_token (lexer, vs))
86 lex_error (lexer, _("Syntax error expecting variable name."));
89 else if (var_set_lookup_var_idx (vs, lex_tokcstr (lexer), idx))
96 lex_error (lexer, _("%s is not a variable name."), lex_tokcstr (lexer));
101 /* Parses a name as a variable within VS and returns the variable
102 if successful. On failure emits an error message and returns
104 static struct variable *
105 parse_vs_variable (struct lexer *lexer, const struct var_set *vs)
108 return parse_vs_variable_idx (lexer, vs, &idx) ? var_set_get_var (vs, idx) : NULL;
111 /* Parses a variable name in dictionary D and returns the
112 variable if successful. On failure emits an error message and
113 returns a null pointer. */
115 parse_variable (struct lexer *lexer, const struct dictionary *d)
117 struct var_set *vs = var_set_create_from_dict (d);
118 struct variable *var = parse_vs_variable (lexer, vs);
119 var_set_destroy (vs);
123 /* Parses a set of variables from dictionary D given options
124 OPTS. Resulting list of variables stored in *VAR and the
125 number of variables into *N. Returns true only if
126 successful. The dictionary D must contain at least one
129 parse_variables (struct lexer *lexer, const struct dictionary *d,
130 struct variable ***var,
137 assert (var != NULL);
140 vs = var_set_create_from_dict (d);
141 if (var_set_get_n (vs) == 0)
144 var_set_destroy (vs);
147 success = parse_var_set_vars (lexer, vs, var, n, opts);
148 var_set_destroy (vs);
152 /* Parses a set of variables from dictionary D given options
153 OPTS. Resulting list of variables stored in *VARS and the
154 number of variables into *N_VARS. Returns true only if
155 successful. Same behavior as parse_variables, except that all
156 allocations are taken from the given POOL. */
158 parse_variables_pool (struct lexer *lexer, struct pool *pool,
159 const struct dictionary *dict,
160 struct variable ***vars, size_t *n_vars, int opts)
164 /* PV_APPEND is unsafe because parse_variables would free the
165 existing names on failure, but those names are presumably
166 already in the pool, which would attempt to re-free it
168 assert (!(opts & PV_APPEND));
170 retval = parse_variables (lexer, dict, vars, n_vars, opts);
172 pool_register (pool, free, *vars);
176 /* Parses a variable name from VS. If successful, sets *IDX to
177 the variable's index in VS, *CLASS to the variable's
178 dictionary class, and returns true. Returns false on
181 parse_var_idx_class (struct lexer *lexer, const struct var_set *vs,
182 size_t *idx, enum dict_class *class)
184 if (!parse_vs_variable_idx (lexer, vs, idx))
187 *class = dict_class_from_id (var_get_name (var_set_get_var (vs, *idx)));
191 /* Add the variable from VS with index IDX to the list of
192 variables V that has *NV elements and room for *MV.
193 Uses and updates INCLUDED to avoid duplicates if indicated by
194 PV_OPTS, which also affects what variables are allowed in
197 add_variable (struct lexer *lexer,
198 struct variable ***v, size_t *nv, size_t *mv,
199 char *included, int pv_opts,
200 const struct var_set *vs, size_t idx,
201 int start_ofs, int end_ofs)
203 struct variable *add = var_set_get_var (vs, idx);
204 const char *add_name = var_get_name (add);
206 if ((pv_opts & PV_NUMERIC) && !var_is_numeric (add))
207 lex_ofs_msg (lexer, SW, start_ofs, end_ofs,
208 _("%s is not a numeric variable. It will not be "
209 "included in the variable list."), add_name);
210 else if ((pv_opts & PV_STRING) && !var_is_alpha (add))
211 lex_ofs_error (lexer, start_ofs, end_ofs,
212 _("%s is not a string variable. It will not be "
213 "included in the variable list."), add_name);
214 else if ((pv_opts & PV_NO_SCRATCH)
215 && dict_class_from_id (add_name) == DC_SCRATCH)
216 lex_ofs_error (lexer, start_ofs, end_ofs,
217 _("Scratch variables (such as %s) are not allowed "
219 else if ((pv_opts & (PV_SAME_TYPE | PV_SAME_WIDTH)) && *nv
220 && var_get_type (add) != var_get_type ((*v)[0]))
221 lex_ofs_error (lexer, start_ofs, end_ofs,
222 _("%s and %s are not the same type. All variables in "
223 "this variable list must be of the same type. %s "
224 "will be omitted from the list."),
225 var_get_name ((*v)[0]), add_name, add_name);
226 else if ((pv_opts & PV_SAME_WIDTH) && *nv
227 && var_get_width (add) != var_get_width ((*v)[0]))
228 lex_ofs_error (lexer, start_ofs, end_ofs,
229 _("%s and %s are string variables with different widths. "
230 "All variables in this variable list must have the "
231 "same width. %s will be omitted from the list."),
232 var_get_name ((*v)[0]), add_name, add_name);
233 else if ((pv_opts & PV_NO_DUPLICATE) && included && included[idx])
234 lex_ofs_error (lexer, start_ofs, end_ofs,
235 _("Variable %s appears twice in variable list."), add_name);
236 else if ((pv_opts & PV_DUPLICATE) || !included || !included[idx])
241 *v = xnrealloc (*v, *mv, sizeof **v);
244 if (included != NULL)
249 /* Adds the variables in VS with indexes FIRST_IDX through
250 LAST_IDX, inclusive, to the list of variables V that has *NV
251 elements and room for *MV. Uses and updates INCLUDED to avoid
252 duplicates if indicated by PV_OPTS, which also affects what
253 variables are allowed in appropriate ways. */
255 add_variables (struct lexer *lexer,
256 struct variable ***v, size_t *nv, size_t *mv, char *included,
258 const struct var_set *vs, int first_idx, int last_idx,
259 enum dict_class class,
260 int start_ofs, int end_ofs)
264 for (i = first_idx; i <= last_idx; i++)
265 if (dict_class_from_id (var_get_name (var_set_get_var (vs, i))) == class)
266 add_variable (lexer, v, nv, mv, included, pv_opts, vs, i,
270 /* Note that if parse_variables() returns false, *v is free()'d.
271 Conversely, if parse_variables() returns true, then *nv is
272 nonzero and *v is non-NULL. */
274 parse_var_set_vars (struct lexer *lexer, const struct var_set *vs,
275 struct variable ***v, size_t *nv,
285 /* At most one of PV_NUMERIC, PV_STRING, PV_SAME_TYPE,
286 PV_SAME_WIDTH may be specified. */
287 assert (((pv_opts & PV_NUMERIC) != 0)
288 + ((pv_opts & PV_STRING) != 0)
289 + ((pv_opts & PV_SAME_TYPE) != 0)
290 + ((pv_opts & PV_SAME_WIDTH) != 0) <= 1);
292 /* PV_DUPLICATE and PV_NO_DUPLICATE are incompatible. */
293 assert (!(pv_opts & PV_DUPLICATE) || !(pv_opts & PV_NO_DUPLICATE));
295 if (!(pv_opts & PV_APPEND))
304 if (!(pv_opts & PV_DUPLICATE))
308 included = xcalloc (var_set_get_n (vs), sizeof *included);
309 for (i = 0; i < *nv; i++)
312 if (!var_set_lookup_var_idx (vs, var_get_name ((*v)[i]), &index))
322 int start_ofs = lex_ofs (lexer);
323 if (lex_match (lexer, T_ALL))
324 add_variables (lexer, v, nv, &mv, included, pv_opts,
325 vs, 0, var_set_get_n (vs) - 1, DC_ORDINARY,
326 start_ofs, start_ofs);
329 enum dict_class class;
332 if (!parse_var_idx_class (lexer, vs, &first_idx, &class))
335 if (!lex_match (lexer, T_TO))
336 add_variable (lexer, v, nv, &mv, included, pv_opts, vs, first_idx,
337 start_ofs, start_ofs);
341 enum dict_class last_class;
342 struct variable *first_var, *last_var;
344 if (!parse_var_idx_class (lexer, vs, &last_idx, &last_class))
347 int end_ofs = lex_ofs (lexer) - 1;
349 first_var = var_set_get_var (vs, first_idx);
350 last_var = var_set_get_var (vs, last_idx);
352 if (last_idx < first_idx)
354 const char *first_name = var_get_name (first_var);
355 const char *last_name = var_get_name (last_var);
356 lex_ofs_error (lexer, start_ofs, end_ofs,
357 _("%s TO %s is not valid syntax since %s "
358 "precedes %s in the dictionary."),
359 first_name, last_name, first_name, last_name);
363 if (class != last_class)
365 lex_ofs_error (lexer, start_ofs, end_ofs,
366 _("With the syntax <a> TO <b>, variables <a> "
367 "and <b> must be both regular variables "
368 "or both scratch variables."));
372 enum dict_class class;
376 { var_get_name (first_var), class, start_ofs },
377 { var_get_name (last_var), last_class, end_ofs },
379 for (size_t i = 0; i < 2; i++)
380 switch (pairs[i].class)
383 lex_ofs_msg (lexer, SN, pairs[i].ofs, pairs[i].ofs,
384 _("%s is a regular variable."),
389 lex_ofs_msg (lexer, SN, pairs[i].ofs, pairs[i].ofs,
390 _("%s is a scratch variable."),
395 lex_ofs_msg (lexer, SN, pairs[i].ofs, pairs[i].ofs,
396 _("%s is a system variable."),
403 add_variables (lexer, v, nv, &mv, included, pv_opts,
404 vs, first_idx, last_idx, class,
405 start_ofs, lex_ofs (lexer) - 1);
409 if (pv_opts & PV_SINGLE)
411 lex_match (lexer, T_COMMA);
413 while (lex_token (lexer) == T_ALL
414 || (is_vs_name_token (lexer, vs)
415 && var_set_lookup_var (vs, lex_tokcstr (lexer)) != NULL));
432 parse_DATA_LIST_var (struct lexer *lexer, const struct dictionary *d)
434 if (!is_dict_name_token (lexer, d))
436 lex_error (lexer, ("Syntax error expecting variable name."));
439 char *error = dict_id_is_valid__ (d, lex_tokcstr (lexer));
442 lex_error (lexer, "%s", error);
447 char *name = xstrdup (lex_tokcstr (lexer));
452 /* Attempts to break UTF-8 encoded NAME into a root (whose contents are
453 arbitrary except that it does not end in a digit) followed by an integer
454 numeric suffix. On success, stores the value of the suffix into *NUMBERP,
455 the number of digits in the suffix into *N_DIGITSP, and returns the number
456 of bytes in the root. On failure, returns 0. */
458 extract_numeric_suffix (struct lexer *lexer, int ofs, const char *name,
459 unsigned long int *numberp, int *n_digitsp)
461 size_t root_len, n_digits;
464 /* Count length of root. */
465 root_len = 1; /* Valid identifier never starts with digit. */
466 for (i = 1; name[i] != '\0'; i++)
467 if (!c_isdigit (name[i]))
469 n_digits = i - root_len;
473 lex_ofs_error (lexer, ofs, ofs,
474 _("`%s' cannot be used with TO because it does not end in "
479 *numberp = strtoull (name + root_len, NULL, 10);
480 if (*numberp == ULONG_MAX)
482 lex_ofs_error (lexer, ofs, ofs,
483 _("Numeric suffix on `%s' is larger than supported with TO."),
487 *n_digitsp = n_digits;
492 add_var_name (struct lexer *lexer, int start_ofs, int end_ofs, char *name,
493 char ***names, size_t *n_vars, size_t *allocated_vars,
494 struct stringi_set *set, int pv_opts)
496 if (pv_opts & PV_NO_DUPLICATE && !stringi_set_insert (set, name))
498 lex_ofs_error (lexer, start_ofs, end_ofs,
499 _("Variable %s appears twice in variable list."),
504 if (*n_vars >= *allocated_vars)
505 *names = x2nrealloc (*names, allocated_vars, sizeof **names);
506 (*names)[(*n_vars)++] = name;
510 /* Parses a list of variable names according to the DATA LIST version
511 of the TO convention. */
513 parse_DATA_LIST_vars (struct lexer *lexer, const struct dictionary *dict,
514 char ***namesp, size_t *n_varsp, int pv_opts)
518 size_t allocated_vars;
520 struct stringi_set set;
527 assert ((pv_opts & ~(PV_APPEND | PV_SINGLE
528 | PV_NO_SCRATCH | PV_NO_DUPLICATE)) == 0);
529 stringi_set_init (&set);
531 if (pv_opts & PV_APPEND)
533 n_vars = allocated_vars = *n_varsp;
536 if (pv_opts & PV_NO_DUPLICATE)
540 for (i = 0; i < n_vars; i++)
541 stringi_set_insert (&set, names[i]);
546 n_vars = allocated_vars = 0;
552 int start_ofs = lex_ofs (lexer);
553 name1 = parse_DATA_LIST_var (lexer, dict);
556 if (dict_class_from_id (name1) == DC_SCRATCH && pv_opts & PV_NO_SCRATCH)
558 lex_ofs_error (lexer, start_ofs, start_ofs,
559 _("Scratch variables not allowed here."));
562 if (lex_match (lexer, T_TO))
564 unsigned long int num1, num2;
565 int n_digits1, n_digits2;
566 int root_len1, root_len2;
567 unsigned long int number;
569 name2 = parse_DATA_LIST_var (lexer, dict);
572 int end_ofs = lex_ofs (lexer) - 1;
574 root_len1 = extract_numeric_suffix (lexer, start_ofs,
575 name1, &num1, &n_digits1);
579 root_len2 = extract_numeric_suffix (lexer, end_ofs,
580 name2, &num2, &n_digits2);
584 if (root_len1 != root_len2 || memcasecmp (name1, name2, root_len1))
586 lex_ofs_error (lexer, start_ofs, end_ofs,
587 _("Prefixes don't match in use of TO convention."));
592 lex_ofs_error (lexer, start_ofs, end_ofs,
593 _("Bad bounds in use of TO convention."));
597 for (number = num1; number <= num2; number++)
599 char *name = xasprintf ("%.*s%0*lu",
602 if (!add_var_name (lexer, start_ofs, end_ofs,
603 name, &names, &n_vars, &allocated_vars,
618 if (!add_var_name (lexer, start_ofs, start_ofs,
619 name1, &names, &n_vars, &allocated_vars,
625 lex_match (lexer, T_COMMA);
627 if (pv_opts & PV_SINGLE)
630 while (lex_token (lexer) == T_ID);
634 stringi_set_destroy (&set);
643 for (i = 0; i < n_vars; i++)
655 /* Registers each of the NAMES[0...NNAMES - 1] in POOL, as well
658 register_vars_pool (struct pool *pool, char **names, size_t nnames)
662 for (i = 0; i < nnames; i++)
663 pool_register (pool, free, names[i]);
664 pool_register (pool, free, names);
667 /* Parses a list of variable names according to the DATA LIST
668 version of the TO convention. Same args as
669 parse_DATA_LIST_vars(), except that all allocations are taken
670 from the given POOL. */
672 parse_DATA_LIST_vars_pool (struct lexer *lexer, const struct dictionary *dict,
674 char ***names, size_t *nnames, int pv_opts)
678 /* PV_APPEND is unsafe because parse_DATA_LIST_vars would free
679 the existing names on failure, but those names are
680 presumably already in the pool, which would attempt to
682 assert (!(pv_opts & PV_APPEND));
684 retval = parse_DATA_LIST_vars (lexer, dict, names, nnames, pv_opts);
686 register_vars_pool (pool, *names, *nnames);
690 /* Parses a list of variables where some of the variables may be
691 existing and the rest are to be created. Same args as
692 parse_DATA_LIST_vars(). */
694 parse_mixed_vars (struct lexer *lexer, const struct dictionary *dict,
695 char ***names, size_t *nnames, int pv_opts)
699 assert (names != NULL);
700 assert (nnames != NULL);
702 if (!(pv_opts & PV_APPEND))
707 while (is_dict_name_token (lexer, dict) || lex_token (lexer) == T_ALL)
709 if (lex_token (lexer) == T_ALL || dict_lookup_var (dict, lex_tokcstr (lexer)) != NULL)
714 if (!parse_variables (lexer, dict, &v, &nv, pv_opts))
716 *names = xnrealloc (*names, *nnames + nv, sizeof **names);
717 for (i = 0; i < nv; i++)
718 (*names)[*nnames + i] = xstrdup (var_get_name (v[i]));
722 else if (!parse_DATA_LIST_vars (lexer, dict, names, nnames, PV_APPEND | pv_opts))
731 for (i = 0; i < *nnames; i++)
739 /* Parses a list of variables where some of the variables may be
740 existing and the rest are to be created. Same args as
741 parse_mixed_vars(), except that all allocations are taken
742 from the given POOL. */
744 parse_mixed_vars_pool (struct lexer *lexer, const struct dictionary *dict, struct pool *pool,
745 char ***names, size_t *nnames, int pv_opts)
749 /* PV_APPEND is unsafe because parse_mixed_vars_pool would free
750 the existing names on failure, but those names are
751 presumably already in the pool, which would attempt to
753 assert (!(pv_opts & PV_APPEND));
755 retval = parse_mixed_vars (lexer, dict, names, nnames, pv_opts);
757 register_vars_pool (pool, *names, *nnames);
761 /* Frees the N var_syntax structures in VS, as well as VS itself. */
763 var_syntax_destroy (struct var_syntax *vs, size_t n)
765 for (size_t i = 0; i < n; i++)
773 /* Parses syntax for variables and variable ranges from LEXER. If successful,
774 initializes *VS to the beginning of an array of var_syntax structs and *N_VS
775 to the number of elements in the array and returns true. On error, sets *VS
776 to NULL and *N_VS to 0 and returns false. */
778 var_syntax_parse (struct lexer *lexer, struct var_syntax **vs, size_t *n_vs)
783 if (lex_token (lexer) != T_ID)
785 lex_error (lexer, _("Syntax error expecting variable name."));
789 size_t allocated_vs = 0;
792 if (allocated_vs >= *n_vs)
793 *vs = x2nrealloc (*vs, &allocated_vs, sizeof **vs);
794 struct var_syntax *new = &(*vs)[(*n_vs)++];
795 *new = (struct var_syntax) {
796 .first = ss_xstrdup (lex_tokss (lexer)),
797 .first_ofs = lex_ofs (lexer)
801 if (lex_match (lexer, T_TO))
803 if (lex_token (lexer) != T_ID)
805 lex_error (lexer, _("Syntax error expecting variable name."));
809 new->last = ss_xstrdup (lex_tokss (lexer));
812 new->last_ofs = lex_ofs (lexer) - 1;
814 while (lex_token (lexer) == T_ID);
818 var_syntax_destroy (*vs, *n_vs);
824 /* Looks up the N_VS var syntax structs in VS in DICT, translating them to an
825 array of variables. If successful, initializes *VARS to the beginning of an
826 array of pointers to variables and *N_VARS to the length of the array and
827 returns true. On error, sets *VARS to NULL and *N_VARS to 0.
829 The LEXER is just used for error messages.
831 For the moment, only honors PV_NUMERIC in OPTS. */
833 var_syntax_evaluate (struct lexer *lexer,
834 const struct var_syntax *vs, size_t n_vs,
835 const struct dictionary *dict,
836 struct variable ***vars, size_t *n_vars, int opts)
838 assert (!(opts & ~PV_NUMERIC));
843 size_t allocated_vars = 0;
844 for (size_t i = 0; i < n_vs; i++)
846 int first_ofs = vs[i].first_ofs;
847 struct variable *first = dict_lookup_var (dict, vs[i].first);
850 lex_ofs_error (lexer, first_ofs, first_ofs,
851 _("%s is not a variable name."), vs[i].first);
855 int last_ofs = vs[i].last_ofs;
856 struct variable *last = (vs[i].last
857 ? dict_lookup_var (dict, vs[i].last)
861 lex_ofs_error (lexer, last_ofs, last_ofs,
862 _("%s is not a variable name."), vs[i].last);
866 size_t first_idx = var_get_dict_index (first);
867 size_t last_idx = var_get_dict_index (last);
868 if (last_idx < first_idx)
870 lex_ofs_error (lexer, first_ofs, last_ofs,
871 _("%s TO %s is not valid syntax since %s "
872 "precedes %s in the dictionary."),
873 vs[i].first, vs[i].last,
874 vs[i].first, vs[i].last);
878 for (size_t j = first_idx; j <= last_idx; j++)
880 struct variable *v = dict_get_var (dict, j);
881 if (opts & PV_NUMERIC && !var_is_numeric (v))
883 lex_ofs_error (lexer, first_ofs, last_ofs,
884 _("%s is not a numeric variable."),
889 if (*n_vars >= allocated_vars)
890 *vars = x2nrealloc (*vars, &allocated_vars, sizeof **vars);
891 (*vars)[(*n_vars)++] = v;
904 /* A set of variables. */
907 bool names_must_be_ids;
908 size_t (*get_n) (const struct var_set *);
909 struct variable *(*get_var) (const struct var_set *, size_t idx);
910 bool (*lookup_var_idx) (const struct var_set *, const char *, size_t *);
911 void (*destroy) (struct var_set *);
915 /* Returns the number of variables in VS. */
917 var_set_get_n (const struct var_set *vs)
921 return vs->get_n (vs);
924 /* Return variable with index IDX in VS.
925 IDX must be less than the number of variables in VS. */
926 static struct variable *
927 var_set_get_var (const struct var_set *vs, size_t idx)
930 assert (idx < var_set_get_n (vs));
932 return vs->get_var (vs, idx);
935 /* Returns the variable in VS named NAME, or a null pointer if VS
936 contains no variable with that name. */
938 var_set_lookup_var (const struct var_set *vs, const char *name)
941 return (var_set_lookup_var_idx (vs, name, &idx)
942 ? var_set_get_var (vs, idx)
946 /* If VS contains a variable named NAME, sets *IDX to its index
947 and returns true. Otherwise, returns false. */
949 var_set_lookup_var_idx (const struct var_set *vs, const char *name,
953 assert (name != NULL);
955 return vs->lookup_var_idx (vs, name, idx);
960 var_set_destroy (struct var_set *vs)
967 var_set_get_names_must_be_ids (const struct var_set *vs)
969 return vs->names_must_be_ids;
972 /* Returns the number of variables in VS. */
974 dict_var_set_get_n (const struct var_set *vs)
976 struct dictionary *d = vs->aux;
978 return dict_get_n_vars (d);
981 /* Return variable with index IDX in VS.
982 IDX must be less than the number of variables in VS. */
983 static struct variable *
984 dict_var_set_get_var (const struct var_set *vs, size_t idx)
986 struct dictionary *d = vs->aux;
988 return dict_get_var (d, idx);
991 /* If VS contains a variable named NAME, sets *IDX to its index
992 and returns true. Otherwise, returns false. */
994 dict_var_set_lookup_var_idx (const struct var_set *vs, const char *name,
997 struct dictionary *d = vs->aux;
998 struct variable *v = dict_lookup_var (d, name);
1001 *idx = var_get_dict_index (v);
1010 dict_var_set_destroy (struct var_set *vs)
1015 /* Returns a variable set based on D. */
1017 var_set_create_from_dict (const struct dictionary *d)
1019 struct var_set *vs = xmalloc (sizeof *vs);
1020 vs->names_must_be_ids = dict_get_names_must_be_ids (d);
1021 vs->get_n = dict_var_set_get_n;
1022 vs->get_var = dict_var_set_get_var;
1023 vs->lookup_var_idx = dict_var_set_lookup_var_idx;
1024 vs->destroy = dict_var_set_destroy;
1025 vs->aux = (void *) d;
1029 /* A variable set based on an array. */
1030 struct array_var_set
1032 struct variable *const *var;/* Array of variables. */
1033 size_t n_vars; /* Number of elements in var. */
1034 struct hmapx vars_by_name; /* Variables hashed by name. */
1037 /* Returns the number of variables in VS. */
1039 array_var_set_get_n (const struct var_set *vs)
1041 struct array_var_set *avs = vs->aux;
1046 /* Return variable with index IDX in VS.
1047 IDX must be less than the number of variables in VS. */
1048 static struct variable *
1049 array_var_set_get_var (const struct var_set *vs, size_t idx)
1051 struct array_var_set *avs = vs->aux;
1053 return CONST_CAST (struct variable *, avs->var[idx]);
1056 /* If VS contains a variable named NAME, sets *IDX to its index
1057 and returns true. Otherwise, returns false. */
1059 array_var_set_lookup_var_idx (const struct var_set *vs, const char *name,
1062 struct array_var_set *avs = vs->aux;
1063 struct hmapx_node *node;
1064 struct variable **varp;
1066 HMAPX_FOR_EACH_WITH_HASH (varp, node, utf8_hash_case_string (name, 0),
1068 if (!utf8_strcasecmp (name, var_get_name (*varp)))
1070 *idx = varp - avs->var;
1079 array_var_set_destroy (struct var_set *vs)
1081 struct array_var_set *avs = vs->aux;
1083 hmapx_destroy (&avs->vars_by_name);
1088 /* Returns a variable set based on the N_VARS variables in VAR. */
1090 var_set_create_from_array (struct variable *const *var, size_t n_vars)
1093 struct array_var_set *avs;
1096 vs = xmalloc (sizeof *vs);
1097 vs->names_must_be_ids = true;
1098 vs->get_n = array_var_set_get_n;
1099 vs->get_var = array_var_set_get_var;
1100 vs->lookup_var_idx = array_var_set_lookup_var_idx;
1101 vs->destroy = array_var_set_destroy;
1102 vs->aux = avs = xmalloc (sizeof *avs);
1104 avs->n_vars = n_vars;
1105 hmapx_init (&avs->vars_by_name);
1106 for (i = 0; i < n_vars; i++)
1108 const char *name = var_get_name (var[i]);
1111 if (array_var_set_lookup_var_idx (vs, name, &idx))
1113 var_set_destroy (vs);
1116 hmapx_insert (&avs->vars_by_name, CONST_CAST (void *, &avs->var[i]),
1117 utf8_hash_case_string (name, 0));
1124 /* Match a variable.
1125 If the match succeeds, the variable will be placed in VAR.
1126 Returns true if successful */
1128 lex_match_variable (struct lexer *lexer, const struct dictionary *dict, const struct variable **var)
1130 if (lex_token (lexer) != T_ID)
1133 *var = parse_variable_const (lexer, dict);
1134 return *var != NULL;