+++ /dev/null
-/* PSPP - computes sample statistics.
- Copyright (C) 1997-9, 2000, 2006, 2007 Free Software Foundation, Inc.
-
- This program is free software; you can redistribute it and/or
- modify it under the terms of the GNU General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
-
- This program is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- 02110-1301, USA. */
-
-#include <config.h>
-
-#include <language/data-io/case-map.h>
-
-#include <stdlib.h>
-
-#include <data/case.h>
-#include <data/dictionary.h>
-#include <data/variable.h>
-#include <libpspp/assertion.h>
-
-#include "xalloc.h"
-
-/* A case map. */
-struct case_map
- {
- size_t value_cnt; /* Number of values in map. */
- int *map; /* For each destination index, the
- corresponding source index. */
- };
-
-/* Prepares dictionary D for producing a case map. Afterward,
- the caller may delete, reorder, or rename variables within D
- at will before using finish_case_map() to produce the case
- map.
-
- Uses D's aux members, which must otherwise not be in use. */
-void
-case_map_prepare (struct dictionary *d)
-{
- size_t var_cnt = dict_get_var_cnt (d);
- size_t i;
-
- for (i = 0; i < var_cnt; i++)
- {
- struct variable *v = dict_get_var (d, i);
- int *src_fv = xmalloc (sizeof *src_fv);
- *src_fv = var_get_case_index (v);
- var_attach_aux (v, src_fv, var_dtor_free);
- }
-}
-
-/* Produces a case map from dictionary D, which must have been
- previously prepared with start_case_map().
-
- Does not retain any reference to D, and clears the aux members
- set up by start_case_map().
-
- Returns the new case map, or a null pointer if no mapping is
- required (that is, no data has changed position). */
-struct case_map *
-case_map_finish (struct dictionary *d)
-{
- struct case_map *map;
- size_t var_cnt = dict_get_var_cnt (d);
- size_t i;
- int identity_map;
-
- map = xmalloc (sizeof *map);
- map->value_cnt = dict_get_next_value_idx (d);
- map->map = xnmalloc (map->value_cnt, sizeof *map->map);
- for (i = 0; i < map->value_cnt; i++)
- map->map[i] = -1;
-
- identity_map = 1;
- for (i = 0; i < var_cnt; i++)
- {
- struct variable *v = dict_get_var (d, i);
- size_t value_cnt = var_get_value_cnt (v);
- int *src_fv = var_detach_aux (v);
- size_t idx;
-
- if (var_get_case_index (v) != *src_fv)
- identity_map = 0;
-
- for (idx = 0; idx < value_cnt; idx++)
- {
- int src_idx = *src_fv + idx;
- int dst_idx = var_get_case_index (v) + idx;
-
- assert (map->map[dst_idx] == -1);
- map->map[dst_idx] = src_idx;
- }
- free (src_fv);
- }
-
- if (identity_map)
- {
- case_map_destroy (map);
- return NULL;
- }
-
- while (map->value_cnt > 0 && map->map[map->value_cnt - 1] == -1)
- map->value_cnt--;
-
- return map;
-}
-
-/* Maps from SRC to DST, applying case map MAP. */
-void
-case_map_execute (const struct case_map *map,
- const struct ccase *src, struct ccase *dst)
-{
- size_t dst_idx;
-
- for (dst_idx = 0; dst_idx < map->value_cnt; dst_idx++)
- {
- int src_idx = map->map[dst_idx];
- if (src_idx != -1)
- *case_data_rw_idx (dst, dst_idx) = *case_data_idx (src, src_idx);
- }
-}
-
-/* Destroys case map MAP. */
-void
-case_map_destroy (struct case_map *map)
-{
- if (map != NULL)
- {
- free (map->map);
- free (map);
- }
-}
+++ /dev/null
-/* PSPP - computes sample statistics.
- Copyright (C) 1997-9, 2000, 2006, 2007 Free Software Foundation, Inc.
-
- This program is free software; you can redistribute it and/or
- modify it under the terms of the GNU General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
-
- This program is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- 02110-1301, USA. */
-
-#ifndef LANGUAGE_DATA_IO_CASE_MAP_H
-#define LANGUAGE_DATA_IO_CASE_MAP_H 1
-
-/* Case map.
-
- A case map copies data from a case that corresponds for one
- dictionary to a case that corresponds to a second dictionary
- derived from the first by, optionally, deleting, reordering,
- or renaming variables. (No new variables may be created.)
- */
-
-struct dictionary;
-struct ccase;
-
-void case_map_prepare (struct dictionary *);
-struct case_map *case_map_finish (struct dictionary *);
-void case_map_execute (const struct case_map *,
- const struct ccase *, struct ccase *);
-void case_map_destroy (struct case_map *);
-
-#endif /* language/data-io/case-map.h */