1 /* PSPP - a program for statistical analysis.
2 Copyright (C) 2008, 2009, 2011 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 "data/subcase.h"
23 #include "data/case.h"
24 #include "data/variable.h"
25 #include "libpspp/assertion.h"
27 #include "gl/xalloc.h"
29 static void invalidate_proto (struct subcase *sc);
31 /* Initializes SC as a subcase that contains no fields. */
33 subcase_init_empty (struct subcase *sc)
40 /* Initializes SC as a subcase with fields extracted from the
41 N_VARS variables in VARS, with ascending sort order. */
43 subcase_init_vars (struct subcase *sc,
44 const struct variable *const *vars, size_t n_vars)
48 sc->fields = xnmalloc (n_vars, sizeof *sc->fields);
49 sc->n_fields = n_vars;
51 for (i = 0; i < n_vars; i++)
53 struct subcase_field *field = &sc->fields[i];
54 field->case_index = var_get_case_index (vars[i]);
55 field->width = var_get_width (vars[i]);
56 field->direction = SC_ASCEND;
60 /* Initializes SC as a subcase with a single field extracted
61 from VAR, with the sort order specified by DIRECTION. */
63 subcase_init_var (struct subcase *sc, const struct variable *var,
64 enum subcase_direction direction)
66 subcase_init_empty (sc);
67 subcase_add_var (sc, var, direction);
72 subcase_init (struct subcase *sc, int index, int width,
73 enum subcase_direction direction)
75 subcase_init_empty (sc);
76 subcase_add (sc, index, width, direction);
80 /* Removes all the fields from SC. */
82 subcase_clear (struct subcase *sc)
85 invalidate_proto (sc);
88 /* Initializes SC with the same fields as ORIG. */
90 subcase_clone (struct subcase *sc, const struct subcase *orig)
92 sc->fields = xmemdup (orig->fields, orig->n_fields * sizeof *orig->fields);
93 sc->n_fields = orig->n_fields;
94 sc->proto = orig->proto ? caseproto_ref (orig->proto) : NULL;
97 /* Frees the memory owned by SC (but not SC itself). */
99 subcase_destroy (struct subcase *sc)
102 caseproto_unref (sc->proto);
105 /* Returns true if VAR already has a field in SC,
108 subcase_contains_var (const struct subcase *sc, const struct variable *var)
110 return subcase_contains (sc, var_get_case_index (var));
113 /* Returns true if CASE_INDEX already has a field in SC,
116 subcase_contains (const struct subcase *sc, int case_index)
120 for (i = 0; i < sc->n_fields; i++)
121 if (sc->fields[i].case_index == case_index)
127 /* Add a field for VAR to SC, with DIRECTION as the sort order.
128 Returns true if successful, false if VAR already has a field
131 subcase_add_var (struct subcase *sc, const struct variable *var,
132 enum subcase_direction direction)
134 if (!subcase_contains_var (sc, var))
136 subcase_add_var_always (sc, var, direction);
143 /* Add a field for CASE_INDEX, WIDTH to SC, with DIRECTION as the sort order.
144 Returns true if successful, false if CASE_INDEX already has a field
147 subcase_add (struct subcase *sc, int case_index, int width,
148 enum subcase_direction direction)
150 if (!subcase_contains (sc, case_index))
152 subcase_add_always (sc, case_index, width, direction);
159 /* Add a field for VAR to SC, with DIRECTION as the sort order,
160 regardless of whether VAR already has a field in SC. */
162 subcase_add_var_always (struct subcase *sc, const struct variable *var,
163 enum subcase_direction direction)
165 return subcase_add_always (sc, var_get_case_index (var),
166 var_get_width (var), direction);
169 /* Add a field for CASE_INDEX, WIDTH to SC, with DIRECTION as the
170 sort order, regardless of whether CASE_INDEX already has a
173 subcase_add_always (struct subcase *sc, int case_index, int width,
174 enum subcase_direction direction)
176 struct subcase_field *field;
178 sc->fields = xnrealloc (sc->fields, sc->n_fields + 1, sizeof *sc->fields);
179 field = &sc->fields[sc->n_fields++];
180 field->case_index = case_index;
181 field->width = width;
182 field->direction = direction;
183 invalidate_proto (sc);
186 /* Adds a field to SC for each column in PROTO, so that SC
187 contains all of the columns in PROTO in the same order as a
188 case conforming to PROTO. The fields are added with
189 ascending direction. */
191 subcase_add_proto_always (struct subcase *sc, const struct caseproto *proto)
193 size_t n = caseproto_get_n_widths (proto);
196 sc->fields = xnrealloc (sc->fields, sc->n_fields + n, sizeof *sc->fields);
197 for (i = 0; i < n; i++)
199 struct subcase_field *field = &sc->fields[sc->n_fields++];
200 field->case_index = i;
201 field->width = caseproto_get_width (proto, i);
202 field->direction = SC_ASCEND;
204 invalidate_proto (sc);
207 /* Obtains a caseproto for a case described by SC. The caller
208 must not modify or unref the returned case prototype. */
209 const struct caseproto *
210 subcase_get_proto (const struct subcase *sc_)
212 struct subcase *sc = CONST_CAST (struct subcase *, sc_);
214 if (sc->proto == NULL)
218 sc->proto = caseproto_create ();
219 for (i = 0; i < sc->n_fields; i++)
220 sc->proto = caseproto_add_width (sc->proto, sc->fields[i].width);
225 /* Returns true if and only if A and B are conformable, which
226 means that they have the same number of fields and that each
227 corresponding field in A and B have the same width. */
229 subcase_conformable (const struct subcase *a, const struct subcase *b)
235 if (a->n_fields != b->n_fields)
237 for (i = 0; i < a->n_fields; i++)
238 if (a->fields[i].width != b->fields[i].width)
243 /* Copies the fields represented by SC from C into VALUES.
244 VALUES must have space for at least subcase_get_n_fields(SC)
247 subcase_extract (const struct subcase *sc, const struct ccase *c,
248 union value values[])
252 for (i = 0; i < sc->n_fields; i++)
254 const struct subcase_field *field = &sc->fields[i];
255 union value *value = &values[i];
256 value_copy (value, case_data_idx (c, field->case_index), field->width);
260 /* Copies the data in VALUES into the fields in C represented by
261 SC. VALUES must have at least subcase_get_n_fields(SC) array
262 elements, and C must be large enough to contain all the fields
265 subcase_inject (const struct subcase *sc,
266 const union value values[], struct ccase *c)
270 for (i = 0; i < sc->n_fields; i++)
272 const struct subcase_field *field = &sc->fields[i];
273 const union value *value = &values[i];
274 value_copy (case_data_rw_idx (c, field->case_index), value,
279 /* Copies the fields in SRC represented by SRC_SC into the
280 corresponding fields in DST respresented by DST_SC. SRC_SC
281 and DST_SC must be conformable (as tested by
282 subcase_conformable()).
284 DST must not be shared. */
286 subcase_copy (const struct subcase *src_sc, const struct ccase *src,
287 const struct subcase *dst_sc, struct ccase *dst)
291 expensive_assert (subcase_conformable (src_sc, dst_sc));
292 for (i = 0; i < src_sc->n_fields; i++)
294 const struct subcase_field *src_field = &src_sc->fields[i];
295 const struct subcase_field *dst_field = &dst_sc->fields[i];
296 value_copy (case_data_rw_idx (dst, dst_field->case_index),
297 case_data_idx (src, src_field->case_index),
302 /* Compares the fields in A specified in A_SC against the fields
303 in B specified in B_SC. Returns -1, 0, or 1 if A's fields are
304 lexicographically less than, equal to, or greater than B's
305 fields, respectively.
307 A_SC and B_SC must be conformable (as tested by
308 subcase_conformable()). */
310 subcase_compare_3way (const struct subcase *a_sc, const struct ccase *a,
311 const struct subcase *b_sc, const struct ccase *b)
315 expensive_assert (subcase_conformable (a_sc, b_sc));
316 for (i = 0; i < a_sc->n_fields; i++)
318 const struct subcase_field *a_field = &a_sc->fields[i];
319 const struct subcase_field *b_field = &b_sc->fields[i];
320 int cmp = value_compare_3way (case_data_idx (a, a_field->case_index),
321 case_data_idx (b, b_field->case_index),
324 return a_field->direction == SC_ASCEND ? cmp : -cmp;
329 /* Compares the values in A against the values in B specified by
330 SC's fields. Returns -1, 0, or 1 if A's values are
331 lexicographically less than, equal to, or greater than B's
332 values, respectively. */
334 subcase_compare_3way_xc (const struct subcase *sc,
335 const union value a[], const struct ccase *b)
339 for (i = 0; i < sc->n_fields; i++)
341 const struct subcase_field *field = &sc->fields[i];
342 int cmp = value_compare_3way (&a[i],
343 case_data_idx (b, field->case_index),
346 return field->direction == SC_ASCEND ? cmp : -cmp;
351 /* Compares the values in A specified by SC's fields against the
352 values in B. Returns -1, 0, or 1 if A's values are
353 lexicographically less than, equal to, or greater than B's
354 values, respectively. */
356 subcase_compare_3way_cx (const struct subcase *sc,
357 const struct ccase *a, const union value b[])
359 return -subcase_compare_3way_xc (sc, b, a);
362 /* Compares the values in A against the values in B, using SC to
363 obtain the number and width of each value. Returns -1, 0, or
364 1 if A's values are lexicographically less than, equal to, or
365 greater than B's values, respectively. */
367 subcase_compare_3way_xx (const struct subcase *sc,
368 const union value a[], const union value b[])
372 for (i = 0; i < sc->n_fields; i++)
374 const struct subcase_field *field = &sc->fields[i];
375 int cmp = value_compare_3way (a++, b++, field->width);
377 return field->direction == SC_ASCEND ? cmp : -cmp;
382 /* Compares the fields in A specified in A_SC against the fields
383 in B specified in B_SC. Returns true if the fields' values
384 are equal, false otherwise.
386 A_SC and B_SC must be conformable (as tested by
387 subcase_conformable()). */
389 subcase_equal (const struct subcase *a_sc, const struct ccase *a,
390 const struct subcase *b_sc, const struct ccase *b)
392 return subcase_compare_3way (a_sc, a, b_sc, b) == 0;
395 /* Compares the values in A against the values in B specified by
396 SC's fields. Returns true if A's values are equal to B's
397 values, otherwise false. */
399 subcase_equal_xc (const struct subcase *sc,
400 const union value a[], const struct ccase *b)
402 return subcase_compare_3way_xc (sc, a, b) == 0;
405 /* Compares the values in A specified by SC's fields against the
406 values in B. Returns true if A's values are equal to B's
407 values, otherwise false. */
409 subcase_equal_cx (const struct subcase *sc,
410 const struct ccase *a, const union value b[])
412 return subcase_compare_3way_cx (sc, a, b) == 0;
415 /* Compares the values in A against the values in B, using SC to
416 obtain the number and width of each value. Returns true if
417 A's values are equal to B's values, otherwise false. */
419 subcase_equal_xx (const struct subcase *sc,
420 const union value a[], const union value b[])
422 return subcase_compare_3way_xx (sc, a, b) == 0;
425 /* Discards SC's case prototype. (It will be recreated if needed
428 invalidate_proto (struct subcase *sc)
430 caseproto_unref (sc->proto);