-/* PSPP - computes sample statistics.
+/* PSPP - a program for statistical analysis.
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 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 3 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.
+ 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. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include <libpspp/str.h>
#include <libpspp/taint.h>
+
struct dataset {
/* Cases are read from source,
their transformation variables are initialized,
/* Callback which occurs whenever the DICT is replaced by a new one */
replace_dictionary_callback *replace_dict;
+ /* Callback which occurs whenever the transformation chain(s) have
+ been modified */
+ transformation_change_callback_func *xform_callback;
+ void *xform_callback_aux;
+
/* If true, cases are discarded instead of being written to
sink. */
bool discard_output;
/* Procedure data. */
enum
{
- PROC_COMMITTED,
- PROC_OPEN,
- PROC_CLOSED
+ PROC_COMMITTED, /* No procedure in progress. */
+ PROC_OPEN, /* proc_open called, casereader still open. */
+ PROC_CLOSED /* casereader from proc_open destroyed,
+ but proc_commit not yet called. */
}
proc_state;
- size_t cases_written; /* Cases output so far. */
+ casenumber cases_written; /* Cases output so far. */
bool ok; /* Error status. */
}; /* struct dataset */
&proc_casereader_class, ds);
}
+/* Returns true if a procedure is in progress, that is, if
+ proc_open has been called but proc_commit has not. */
bool
proc_is_open (const struct dataset *ds)
{
return ds->proc_state != PROC_COMMITTED;
}
-/* Reads the next case from dataset DS, which must have been
- opened for reading with proc_open.
- Returns true if successful, in which case a pointer to the
- case is stored in *C.
- Return false at end of file or if a read error occurs. In
- this case a null pointer is stored in *C. */
+/* "read" function for procedure casereader. */
static bool
proc_casereader_read (struct casereader *reader UNUSED, void *ds_,
struct ccase *c)
assert (ds->proc_state == PROC_OPEN);
for (;;)
{
- size_t case_nr;
+ casenumber case_nr;
assert (retval == TRNS_DROP_CASE || retval == TRNS_ERROR);
if (retval == TRNS_ERROR)
if (!casereader_read (ds->source, c))
return false;
case_resize (c, dict_get_next_value_idx (ds->dict));
- caseinit_init_reinit_vars (ds->caseinit, c);
- caseinit_init_left_vars (ds->caseinit, c);
+ caseinit_init_vars (ds->caseinit, c);
/* Execute permanent transformations. */
case_nr = ds->cases_written + 1;
retval = trns_chain_execute (ds->permanent_trns_chain, TRNS_CONTINUE,
- c, &case_nr);
+ c, case_nr);
caseinit_update_left_vars (ds->caseinit, c);
if (retval != TRNS_CONTINUE)
{
if (ds->temporary_trns_chain != NULL)
{
retval = trns_chain_execute (ds->temporary_trns_chain, TRNS_CONTINUE,
- c, &ds->cases_written);
+ c, ds->cases_written);
if (retval != TRNS_CONTINUE)
{
case_destroy (c);
}
}
-/* Closes dataset DS for reading.
- Returns true if successful, false if an I/O error occurred
- while reading or closing the data set.
- If DS has not been opened, returns true without doing
- anything else. */
+/* "destroy" function for procedure casereader. */
static void
proc_casereader_destroy (struct casereader *reader, void *ds_)
{
return proc_cancel_all_transformations (ds) && ds->ok;
}
+/* Casereader class for procedure execution. */
static struct casereader_class proc_casereader_class =
{
proc_casereader_read,
assert (ds->temporary_trns_chain == NULL);
chain = ds->permanent_trns_chain;
ds->cur_trns_chain = ds->permanent_trns_chain = trns_chain_create ();
+
+ if ( ds->xform_callback)
+ ds->xform_callback (false, ds->xform_callback_aux);
+
return chain;
}
add_transformation (struct dataset *ds, trns_proc_func *proc, trns_free_func *free, void *aux)
{
trns_chain_append (ds->cur_trns_chain, NULL, proc, free, aux);
+ if ( ds->xform_callback)
+ ds->xform_callback (true, ds->xform_callback_aux);
}
/* Adds a transformation that processes a case with PROC and
trns_free_func *free, void *aux)
{
trns_chain_append (ds->cur_trns_chain, finalize, proc, free, aux);
+
+ if ( ds->xform_callback)
+ ds->xform_callback (true, ds->xform_callback_aux);
}
/* Returns the index of the next transformation.
trns_chain_finalize (ds->permanent_trns_chain);
ds->temporary_trns_chain = ds->cur_trns_chain = trns_chain_create ();
+
+ if ( ds->xform_callback)
+ ds->xform_callback (true, ds->xform_callback_aux);
}
}
trns_chain_destroy (ds->temporary_trns_chain);
ds->temporary_trns_chain = NULL;
+ if ( ds->xform_callback)
+ ds->xform_callback (!trns_chain_is_empty (ds->permanent_trns_chain),
+ ds->xform_callback_aux);
+
return true;
}
else
ok = trns_chain_destroy (ds->temporary_trns_chain) && ok;
ds->permanent_trns_chain = ds->cur_trns_chain = trns_chain_create ();
ds->temporary_trns_chain = NULL;
+ if ( ds->xform_callback)
+ ds->xform_callback (false, ds->xform_callback_aux);
+
return ok;
}
\f
/* Initializes procedure handling. */
struct dataset *
-create_dataset (replace_source_callback *rps,
- replace_dictionary_callback *rds)
+create_dataset (transformation_change_callback_func *cb, void *aux)
{
struct dataset *ds = xzalloc (sizeof(*ds));
ds->dict = dict_create ();
ds->caseinit = caseinit_create ();
- ds->replace_source = rps;
- ds->replace_dict = rds;
+ ds->xform_callback = cb;
+ ds->xform_callback_aux = aux;
proc_cancel_all_transformations (ds);
return ds;
}
+
+void
+dataset_add_transform_change_callback (struct dataset *ds,
+ transformation_change_callback_func *cb,
+ void *aux)
+{
+ ds->xform_callback = cb;
+ ds->xform_callback_aux = aux;
+}
+
/* Finishes up procedure handling. */
void
destroy_dataset (struct dataset *ds)
dict_destroy (ds->dict);
caseinit_destroy (ds->caseinit);
trns_chain_destroy (ds->permanent_trns_chain);
+
+ if ( ds->xform_callback)
+ ds->xform_callback (false, ds->xform_callback_aux);
free (ds);
}
return ds->dict;
}
+const struct casereader *
+dataset_source (const struct dataset *ds)
+{
+ return ds->source;
+}
+
void
dataset_need_lag (struct dataset *ds, int n_before)
{
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