#include "data/transformations.h"
#include "data/variable.h"
#include "libpspp/deque.h"
+#include "libpspp/hash-functions.h"
+#include "libpspp/hmap.h"
#include "libpspp/misc.h"
#include "libpspp/str.h"
#include "libpspp/taint.h"
static void dataset_transformations_changed__ (struct dataset *,
bool non_empty);
+static void add_measurement_level_trns (struct dataset *, struct dictionary *);
+static void cancel_measurement_level_trns (struct trns_chain *);
static void add_case_limit_trns (struct dataset *ds);
static void add_filter_trns (struct dataset *ds);
assert (old->sink == NULL);
assert (!old->temporary);
assert (!old->temporary_trns_chain.n);
+ assert (!old->n_stack);
new = xzalloc (sizeof *new);
new->name = xstrdup (name);
{
struct casereader *reader;
+ assert (ds->n_stack == 0);
assert (ds->source != NULL);
assert (ds->proc_state == PROC_COMMITTED);
add_case_limit_trns (ds);
if (filter)
add_filter_trns (ds);
+ if (!proc_in_temporary_transformations (ds))
+ add_measurement_level_trns (ds, ds->dict);
/* Make permanent_dict refer to the dictionary right before
data reaches the sink. */
/* Dictionary from before TEMPORARY becomes permanent. */
proc_cancel_temporary_transformations (ds);
+ bool ok = proc_cancel_all_transformations (ds) && ds->ok;
if (!ds->discard_output)
{
dict_clear_vectors (ds->dict);
ds->permanent_dict = NULL;
- return proc_cancel_all_transformations (ds) && ds->ok;
+ return ok;
}
/* Casereader class for procedure execution. */
void
proc_start_temporary_transformations (struct dataset *ds)
{
+ assert (!ds->n_stack);
if (!proc_in_temporary_transformations (ds))
{
add_case_limit_trns (ds);
ds->permanent_dict = dict_clone (ds->dict);
+ add_measurement_level_trns (ds, ds->permanent_dict);
ds->temporary = true;
dataset_transformations_changed__ (ds, true);
{
if (proc_in_temporary_transformations (ds))
{
+ cancel_measurement_level_trns (&ds->permanent_trns_chain);
trns_chain_splice (&ds->permanent_trns_chain, &ds->temporary_trns_chain);
ds->temporary = false;
{
if (proc_in_temporary_transformations (ds))
{
+ trns_chain_clear (&ds->temporary_trns_chain);
+
dict_unref (ds->dict);
ds->dict = ds->permanent_dict;
ds->permanent_dict = NULL;
- trns_chain_clear (&ds->temporary_trns_chain);
-
dataset_transformations_changed__ (ds, ds->permanent_trns_chain.n != 0);
return true;
}
ds->n_lag = MAX (ds->n_lag, n_before);
}
\f
+/* Measurement guesser, for guessing a measurement level from formats and
+ data. */
+
+struct mg_value
+ {
+ struct hmap_node hmap_node;
+ double value;
+ };
+
+struct mg_var
+ {
+ struct variable *var;
+ struct hmap *values;
+ };
+
+static void
+mg_var_uninit (struct mg_var *mgv)
+{
+ struct mg_value *mgvalue, *next;
+ HMAP_FOR_EACH_SAFE (mgvalue, next, struct mg_value, hmap_node,
+ mgv->values)
+ {
+ hmap_delete (mgv->values, &mgvalue->hmap_node);
+ free (mgvalue);
+ }
+ hmap_destroy (mgv->values);
+ free (mgv->values);
+}
+
+static enum measure
+mg_var_interpret (const struct mg_var *mgv)
+{
+ size_t n = hmap_count (mgv->values);
+ if (!n)
+ {
+ /* All missing (or no data). */
+ return MEASURE_NOMINAL;
+ }
+
+ const struct mg_value *mgvalue;
+ HMAP_FOR_EACH (mgvalue, struct mg_value, hmap_node,
+ mgv->values)
+ if (mgvalue->value < 10)
+ return MEASURE_NOMINAL;
+ return MEASURE_SCALE;
+}
+
+static enum measure
+mg_var_add_value (struct mg_var *mgv, double value)
+{
+ if (var_is_num_missing (mgv->var, value))
+ return MEASURE_UNKNOWN;
+ else if (value < 0 || value != floor (value))
+ return MEASURE_SCALE;
+
+ size_t hash = hash_double (value, 0);
+ struct mg_value *mgvalue;
+ HMAP_FOR_EACH_WITH_HASH (mgvalue, struct mg_value, hmap_node,
+ hash, mgv->values)
+ if (mgvalue->value == value)
+ return MEASURE_UNKNOWN;
+
+ mgvalue = xmalloc (sizeof *mgvalue);
+ mgvalue->value = value;
+ hmap_insert (mgv->values, &mgvalue->hmap_node, hash);
+ if (hmap_count (mgv->values) >= settings_get_scalemin ())
+ return MEASURE_SCALE;
+
+ return MEASURE_UNKNOWN;
+}
+
+struct measure_guesser
+ {
+ struct mg_var *vars;
+ size_t n_vars;
+ };
+
+static struct measure_guesser *
+measure_guesser_create__ (struct dictionary *dict)
+{
+ struct mg_var *mgvs = NULL;
+ size_t n_mgvs = 0;
+ size_t allocated_mgvs = 0;
+
+ for (size_t i = 0; i < dict_get_n_vars (dict); i++)
+ {
+ struct variable *var = dict_get_var (dict, i);
+ if (var_get_measure (var) != MEASURE_UNKNOWN)
+ continue;
+
+ const struct fmt_spec *f = var_get_print_format (var);
+ enum measure m = var_default_measure_for_format (f->type);
+ if (m != MEASURE_UNKNOWN)
+ {
+ var_set_measure (var, m);
+ continue;
+ }
+
+ if (n_mgvs >= allocated_mgvs)
+ mgvs = x2nrealloc (mgvs, &allocated_mgvs, sizeof *mgvs);
+
+ struct mg_var *mgv = &mgvs[n_mgvs++];
+ *mgv = (struct mg_var) {
+ .var = var,
+ .values = xmalloc (sizeof *mgv->values),
+ };
+ hmap_init (mgv->values);
+ }
+ if (!n_mgvs)
+ return NULL;
+
+ struct measure_guesser *mg = xmalloc (sizeof *mg);
+ *mg = (struct measure_guesser) {
+ .vars = mgvs,
+ .n_vars = n_mgvs,
+ };
+ return mg;
+}
+
+/* Scans through DS's dictionary for variables that have an unknown measurement
+ level. For those, if the measurement level can be guessed based on the
+ variable's type and format, sets a default. If that's enough, returns NULL.
+ If any remain whose levels are unknown and can't be guessed that way,
+ creates and returns a structure that the caller should pass to
+ measure_guesser_add_case() or measure_guesser_run() for guessing a
+ measurement level based on the data. */
+struct measure_guesser *
+measure_guesser_create (struct dataset *ds)
+{
+ return measure_guesser_create__ (dataset_dict (ds));
+}
+
+/* Adds data from case C to MG. */
+static void
+measure_guesser_add_case (struct measure_guesser *mg, const struct ccase *c)
+{
+ for (size_t i = 0; i < mg->n_vars; )
+ {
+ struct mg_var *mgv = &mg->vars[i];
+ double value = case_num (c, mgv->var);
+ enum measure m = mg_var_add_value (mgv, value);
+ if (m != MEASURE_UNKNOWN)
+ {
+ var_set_measure (mgv->var, m);
+
+ mg_var_uninit (mgv);
+ *mgv = mg->vars[--mg->n_vars];
+ }
+ else
+ i++;
+ }
+}
+
+/* Destroys MG. */
+void
+measure_guesser_destroy (struct measure_guesser *mg)
+{
+ if (!mg)
+ return;
+
+ for (size_t i = 0; i < mg->n_vars; i++)
+ {
+ struct mg_var *mgv = &mg->vars[i];
+ var_set_measure (mgv->var, mg_var_interpret (mgv));
+ mg_var_uninit (mgv);
+ }
+ free (mg->vars);
+ free (mg);
+}
+
+/* Adds final measurement levels based on MG, after all the cases have been
+ added. */
+static void
+measure_guesser_commit (struct measure_guesser *mg)
+{
+ for (size_t i = 0; i < mg->n_vars; i++)
+ {
+ struct mg_var *mgv = &mg->vars[i];
+ var_set_measure (mgv->var, mg_var_interpret (mgv));
+ }
+}
+
+/* Passes the cases in READER through MG and uses the data in the cases to set
+ measurement levels for the variables where they were still unknown. */
+void
+measure_guesser_run (struct measure_guesser *mg,
+ const struct casereader *reader)
+{
+ struct casereader *r = casereader_clone (reader);
+ while (mg->n_vars > 0)
+ {
+ struct ccase *c = casereader_read (r);
+ if (!c)
+ break;
+ measure_guesser_add_case (mg, c);
+ case_unref (c);
+ }
+ casereader_destroy (r);
+
+ measure_guesser_commit (mg);
+}
+\f
+/* A transformation for guessing measurement levels. */
+
+static enum trns_result
+mg_trns_proc (void *mg_, struct ccase **c, casenumber case_nr UNUSED)
+{
+ struct measure_guesser *mg = mg_;
+ measure_guesser_add_case (mg, *c);
+ return TRNS_CONTINUE;
+}
+
+static bool
+mg_trns_free (void *mg_)
+{
+ struct measure_guesser *mg = mg_;
+ measure_guesser_commit (mg);
+ measure_guesser_destroy (mg);
+ return true;
+}
+
+static const struct trns_class mg_trns_class = {
+ .name = "add measurement level",
+ .execute = mg_trns_proc,
+ .destroy = mg_trns_free,
+};
+
+static void
+add_measurement_level_trns (struct dataset *ds, struct dictionary *dict)
+{
+ struct measure_guesser *mg = measure_guesser_create__ (dict);
+ if (mg)
+ add_transformation (ds, &mg_trns_class, mg);
+}
+
+static void
+cancel_measurement_level_trns (struct trns_chain *chain)
+{
+ if (!chain->n)
+ return;
+
+ struct transformation *trns = &chain->xforms[chain->n - 1];
+ if (trns->class != &mg_trns_class)
+ return;
+
+ struct measure_guesser *mg = trns->aux;
+ measure_guesser_destroy (mg);
+ chain->n--;
+}
+\f
static void
dataset_changed__ (struct dataset *ds)
{
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