/* PSPP - computes sample statistics.
- Copyright (C) 1997-9, 2000 Free Software Foundation, Inc.
+ Copyright (C) 1997-9, 2000, 2006 Free Software Foundation, Inc.
Written by Ben Pfaff <blp@gnu.org>.
This program is free software; you can redistribute it and/or
#include "alloc.h"
#include "case.h"
#include "cat.h"
+#include "cat-routines.h"
#include "error.h"
#include "hash.h"
#include "misc.h"
return v;
}
-/* Returns nonzero if variable V is in dictionary D. */
-int
+/* Returns true if variable V is in dictionary D,
+ false otherwise. */
+bool
dict_contains_var (const struct dictionary *d, const struct variable *v)
{
assert (d != NULL);
/* Renames COUNT variables specified in VARS to the names given
in NEW_NAMES within dictionary D. If the renaming would
- result in a duplicate variable name, returns zero and stores a
+ result in a duplicate variable name, returns false and stores a
name that would be duplicated into *ERR_NAME (if ERR_NAME is
- non-null). Otherwise, the renaming is successful, and nonzero
+ non-null). Otherwise, the renaming is successful, and true
is returned. */
-int
+bool
dict_rename_vars (struct dictionary *d,
struct variable **vars, char **new_names,
size_t count, char **err_name)
{
char **old_names;
size_t i;
- int success = 1;
+ bool success = true;
assert (d != NULL);
assert (count == 0 || vars != NULL);
hsh_force_insert (d->name_tab, vars[i]);
}
- success = 0;
+ success = false;
goto done;
}
}
}
}
-/* Copies values from SRC, which represents a case arranged
- according to dictionary D, to DST, which represents a case
- arranged according to the dictionary that will be produced by
- dict_compact_values(D). */
-void
-dict_compact_case (const struct dictionary *d,
- struct ccase *dst, const struct ccase *src)
-{
- size_t i;
- size_t value_idx;
-
- value_idx = 0;
- for (i = 0; i < d->var_cnt; i++)
- {
- struct variable *v = d->var[i];
-
- if (dict_class_from_id (v->name) != DC_SCRATCH)
- {
- case_copy (dst, value_idx, src, v->fv, v->nv);
- value_idx += v->nv;
- }
- }
-}
-
/* Returns the number of values that would be used by a case if
dict_compact_values() were called. */
size_t
return idx_to_fv;
}
+/* Returns true if a case for dictionary D would be smaller after
+ compaction, false otherwise. Compacting a case eliminates
+ "holes" between values and after the last value. Holes are
+ created by deleting variables (or by scratch variables).
+
+ The return value may differ from whether compacting a case
+ from dictionary D would *change* the case: compaction could
+ rearrange values even if it didn't reduce space
+ requirements. */
+bool
+dict_needs_compaction (const struct dictionary *d)
+{
+ return dict_get_compacted_value_cnt (d) < dict_get_next_value_idx (d);
+}
+\f
+/* How to copy a contiguous range of values between cases. */
+struct copy_map
+ {
+ size_t src_idx; /* Starting value index in source case. */
+ size_t dst_idx; /* Starting value index in target case. */
+ size_t cnt; /* Number of values. */
+ };
+
+/* How to compact a case. */
+struct dict_compactor
+ {
+ struct copy_map *maps; /* Array of mappings. */
+ size_t map_cnt; /* Number of mappings. */
+ };
+
+/* Creates and returns a dict_compactor that can be used to
+ compact cases for dictionary D.
+
+ Compacting a case eliminates "holes" between values and after
+ the last value. Holes are created by deleting variables (or
+ by scratch variables). */
+struct dict_compactor *
+dict_make_compactor (const struct dictionary *d)
+{
+ struct dict_compactor *compactor;
+ struct copy_map *map;
+ size_t map_allocated;
+ size_t value_idx;
+ size_t i;
+
+ compactor = xmalloc (sizeof *compactor);
+ compactor->maps = NULL;
+ compactor->map_cnt = 0;
+ map_allocated = 0;
+
+ value_idx = 0;
+ map = NULL;
+ for (i = 0; i < d->var_cnt; i++)
+ {
+ struct variable *v = d->var[i];
+
+ if (dict_class_from_id (v->name) == DC_SCRATCH)
+ continue;
+ if (map != NULL && map->src_idx + map->cnt == v->fv)
+ map->cnt += v->nv;
+ else
+ {
+ if (compactor->map_cnt == map_allocated)
+ compactor->maps = x2nrealloc (compactor->maps, &map_allocated,
+ sizeof *compactor->maps);
+ map = &compactor->maps[compactor->map_cnt++];
+ map->src_idx = v->fv;
+ map->dst_idx = value_idx;
+ map->cnt = v->nv;
+ }
+ value_idx += v->nv;
+ }
+
+ return compactor;
+}
+
+/* Compacts SRC by copying it to DST according to the scheme in
+ COMPACTOR.
+
+ Compacting a case eliminates "holes" between values and after
+ the last value. Holes are created by deleting variables (or
+ by scratch variables). */
+void
+dict_compactor_compact (const struct dict_compactor *compactor,
+ struct ccase *dst, const struct ccase *src)
+{
+ size_t i;
+
+ for (i = 0; i < compactor->map_cnt; i++)
+ {
+ const struct copy_map *map = &compactor->maps[i];
+ case_copy (dst, map->dst_idx, src, map->src_idx, map->cnt);
+ }
+}
+
+/* Destroys COMPACTOR. */
+void
+dict_compactor_destroy (struct dict_compactor *compactor)
+{
+ if (compactor != NULL)
+ {
+ free (compactor->maps);
+ free (compactor);
+ }
+}
+
/* Returns the SPLIT FILE vars (see cmd_split_file()). Call
dict_get_split_cnt() to determine how many SPLIT FILE vars
there are. Returns a null pointer if and only if there are no
}
/* Creates in D a vector named NAME that contains CNT variables
- VAR (see cmd_vector()). Returns nonzero if successful, or
- zero if a vector named NAME already exists in D. */
-int
+ VAR (see cmd_vector()). Returns true if successful, or
+ false if a vector named NAME already exists in D. */
+bool
dict_create_vector (struct dictionary *d,
const char *name,
struct variable **var, size_t cnt)
assert (cnt > 0);
if (dict_lookup_vector (d, name) != NULL)
- return 0;
+ return false;
d->vector = xnrealloc (d->vector, d->vector_cnt + 1, sizeof *d->vector);
vector = d->vector[d->vector_cnt] = xmalloc (sizeof *vector);
}
vector->cnt = cnt;
- return 1;
+ return true;
}
/* Returns the vector in D with index IDX, which must be less
projects / pspp-builds.git / blobdiff