X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fui%2Fgui%2Fpsppire-data-store.c;h=59099a153e9297961a659d3bfc1a59b6d70c0ff9;hb=d5a566a2900f69ab51c7dae78cd7810a4204589a;hp=65a4391d224402e353648de7795607c57e03366b;hpb=338fb2a2e84df6427a2fdee6769421f57d5666d8;p=pspp

diff --git a/src/ui/gui/psppire-data-store.c b/src/ui/gui/psppire-data-store.c
index 65a4391d22..59099a153e 100644
--- a/src/ui/gui/psppire-data-store.c
+++ b/src/ui/gui/psppire-data-store.c
@@ -1,12 +1,9 @@
-/* psppire-data-store.c
- 
-   PSPPIRE --- A Graphical User Interface for PSPP
-   Copyright (C) 2006  Free Software Foundation
-   Written by John Darrington
+/* PSPPIRE - a graphical user interface for PSPP.
+   Copyright (C) 2006, 2008, 2009, 2010, 2011, 2012, 2013, 2016  Free Software Foundation
 
-   This program is free software; you can redistribute it and/or modify
+   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
+   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,
@@ -15,73 +12,72 @@
    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 <string.h>
 #include <stdlib.h>
 #include <gettext.h>
-#define _(msgid) gettext(msgid)
+#define _(msgid) gettext (msgid)
 #define N_(msgid) msgid
 
-#include <data/casefile.h>
-#include <data/case.h>
+#include <data/datasheet.h>
 #include <data/data-out.h>
+#include <data/variable.h>
 
-#include <gtksheet/gtksheet.h>
-#include <gtksheet/gsheetmodel.h>
-#include <gtksheet/gsheet-column-iface.h>
+#include <ui/gui/psppire-marshal.h>
 
 #include <pango/pango-context.h>
 
-#include "psppire-variable.h"
 #include "psppire-data-store.h"
-#include "psppire-case-file.h"
+#include <libpspp/i18n.h>
 #include "helper.h"
 
 #include <data/dictionary.h>
 #include <data/missing-values.h>
 #include <data/value-labels.h>
 #include <data/data-in.h>
+#include <data/format.h>
 
-#include <data/file-handle-def.h>
-#include <data/sys-file-writer.h>
+#include <math/sort.h>
+
+#include "xalloc.h"
+#include "xmalloca.h"
 
 
 
 static void psppire_data_store_init            (PsppireDataStore      *data_store);
 static void psppire_data_store_class_init      (PsppireDataStoreClass *class);
-static void psppire_data_store_sheet_model_init (GSheetModelIface *iface);
-static void psppire_data_store_sheet_column_init (GSheetColumnIface *iface);
-static void psppire_data_store_sheet_row_init (GSheetRowIface *iface);
 
 static void psppire_data_store_finalize        (GObject           *object);
+static void psppire_data_store_dispose        (GObject           *object);
 
-static gchar *psppire_data_store_get_string(const GSheetModel *sheet_model, gint row, gint column);
-
-static gboolean psppire_data_store_set_string(GSheetModel *model, 
-					  const gchar *text, gint row, gint column);
-
-static gboolean psppire_data_store_clear_datum(GSheetModel *model, 
-					  gint row, gint column);
-
+static gboolean psppire_data_store_insert_case (PsppireDataStore *ds,
+						struct ccase *cc,
+						casenumber posn);
 
-#define MIN_COLUMNS 10
 
-#define TRAILING_ROWS 10
+static gboolean psppire_data_store_data_in (PsppireDataStore *ds,
+					    casenumber casenum, gint idx,
+					    struct substring input,
+					    const struct fmt_spec *fmt);
 
 static GObjectClass *parent_class = NULL;
 
 
-enum  {FONT_CHANGED,
-       n_SIGNALS};
+enum
+  {
+    BACKEND_CHANGED,
+    CASES_DELETED,
+    CASE_INSERTED,
+    CASE_CHANGED,
+    n_SIGNALS
+  };
 
-static guint signal[n_SIGNALS];
+static guint signals [n_SIGNALS];
 
 
-inline GType
+GType
 psppire_data_store_get_type (void)
 {
   static GType data_store_type = 0;
@@ -101,42 +97,9 @@ psppire_data_store_get_type (void)
         (GInstanceInitFunc) psppire_data_store_init,
       };
 
-      static const GInterfaceInfo sheet_model_info =
-      {
-	(GInterfaceInitFunc) psppire_data_store_sheet_model_init,
-	NULL,
-	NULL
-      };
-
-      static const GInterfaceInfo sheet_column_info =
-      {
-	(GInterfaceInitFunc) psppire_data_store_sheet_column_init,
-	NULL,
-	NULL
-      };
-
-      static const GInterfaceInfo sheet_row_info =
-      {
-	(GInterfaceInitFunc) psppire_data_store_sheet_row_init,
-	NULL,
-	NULL
-      };
-
-
-      data_store_type = g_type_register_static (G_TYPE_OBJECT, "PsppireDataStore",
+      data_store_type = g_type_register_static (G_TYPE_OBJECT,
+						"PsppireDataStore",
 						&data_store_info, 0);
-
-      g_type_add_interface_static (data_store_type,
-				   G_TYPE_SHEET_MODEL,
-				   &sheet_model_info);
-
-      g_type_add_interface_static (data_store_type,
-				   G_TYPE_SHEET_COLUMN,
-				   &sheet_column_info);
-
-      g_type_add_interface_static (data_store_type,
-				   G_TYPE_SHEET_ROW,
-				   &sheet_row_info);
     }
 
   return data_store_type;
@@ -152,187 +115,159 @@ psppire_data_store_class_init (PsppireDataStoreClass *class)
   object_class = (GObjectClass*) class;
 
   object_class->finalize = psppire_data_store_finalize;
+  object_class->dispose = psppire_data_store_dispose;
 
-  signal[FONT_CHANGED] =
-    g_signal_new ("font_changed",
-		  G_TYPE_FROM_CLASS(class),
+  signals [BACKEND_CHANGED] =
+    g_signal_new ("backend-changed",
+		  G_TYPE_FROM_CLASS (class),
 		  G_SIGNAL_RUN_FIRST,
 		  0,
 		  NULL, NULL,
 		  g_cclosure_marshal_VOID__VOID,
-		  G_TYPE_NONE, 
+		  G_TYPE_NONE,
 		  0);
-}
 
+  signals [CASE_INSERTED] =
+    g_signal_new ("case-inserted",
+		  G_TYPE_FROM_CLASS (class),
+		  G_SIGNAL_RUN_FIRST,
+		  0,
+		  NULL, NULL,
+		  g_cclosure_marshal_VOID__INT,
+		  G_TYPE_NONE,
+		  1,
+		  G_TYPE_INT);
 
 
-static gint
-psppire_data_store_get_var_count (const GSheetModel *model)
-{
-  const PsppireDataStore *store = PSPPIRE_DATA_STORE(model);
-  
-  return psppire_dict_get_var_cnt(store->dict);
+  signals [CASE_CHANGED] =
+    g_signal_new ("case-changed",
+		  G_TYPE_FROM_CLASS (class),
+		  G_SIGNAL_RUN_FIRST,
+		  0,
+		  NULL, NULL,
+		  g_cclosure_marshal_VOID__INT,
+		  G_TYPE_NONE,
+		  1,
+		  G_TYPE_INT);
+
+  signals [CASES_DELETED] =
+    g_signal_new ("cases-deleted",
+		  G_TYPE_FROM_CLASS (class),
+		  G_SIGNAL_RUN_FIRST,
+		  0,
+		  NULL, NULL,
+		  psppire_marshal_VOID__INT_INT,
+		  G_TYPE_NONE,
+		  2,
+		  G_TYPE_INT,
+		  G_TYPE_INT);
 }
 
-static gint
-psppire_data_store_get_case_count (const GSheetModel *model)
-{
-  const PsppireDataStore *store = PSPPIRE_DATA_STORE(model);
-
-  return psppire_case_file_get_case_count(store->case_file);
-}
 
 
-static void
-psppire_data_store_init (PsppireDataStore *data_store)
-{
-  data_store->dict = 0;
-  data_store->case_file = 0;
-  data_store->width_of_m = 10;
-}
+static gboolean
+psppire_data_store_insert_value (PsppireDataStore *ds,
+				  gint width, gint where);
 
-const PangoFontDescription *
-psppire_data_store_get_font_desc(const GSheetModel *model,
-			      gint row, gint column)
+casenumber
+psppire_data_store_get_case_count (const PsppireDataStore *store)
 {
-  PsppireDataStore *store = PSPPIRE_DATA_STORE(model);
-  
-  return store->font_desc;
+  return datasheet_get_n_rows (store->datasheet);
 }
 
-
-static void
-psppire_data_store_sheet_model_init (GSheetModelIface *iface)
+size_t
+psppire_data_store_get_value_count (const PsppireDataStore *store)
 {
-  iface->free_strings = TRUE;
-  iface->get_string = psppire_data_store_get_string;
-  iface->set_string = psppire_data_store_set_string;
-  iface->clear_datum = psppire_data_store_clear_datum;
-  iface->is_editable = NULL;
-  iface->is_visible = NULL;
-  iface->get_foreground = NULL;
-  iface->get_background = NULL;
-  iface->get_font_desc = psppire_data_store_get_font_desc;
-  iface->get_cell_border = NULL;
-  iface->get_column_count = psppire_data_store_get_var_count;
-  iface->get_row_count = psppire_data_store_get_case_count;
+  return psppire_dict_get_value_cnt (store->dict);
 }
 
-static
-gboolean always_true()
+const struct caseproto *
+psppire_data_store_get_proto (const PsppireDataStore *store)
 {
-  return TRUE;
+  return psppire_dict_get_proto (store->dict);
 }
 
-
 static void
-delete_cases_callback(GtkWidget *w, gint first, gint n_cases, gpointer data)
+psppire_data_store_init (PsppireDataStore *data_store)
 {
-  PsppireDataStore *store  ;
-
-  g_return_if_fail (data);
-
-  store  = PSPPIRE_DATA_STORE(data);
-
-  g_assert(first >= 0);
-
-  g_sheet_model_rows_deleted (G_SHEET_MODEL(store), first, n_cases);
+  data_store->dict = NULL;
+  data_store->datasheet = NULL;
+  data_store->dispose_has_run = FALSE;
 }
 
-
+/*
+   A callback which occurs after a variable has been deleted.
+ */
 static void
-insert_case_callback(GtkWidget *w, gint casenum, gpointer data)
+delete_variable_callback (GObject *obj, const struct variable *var UNUSED,
+                          gint dict_index, gint case_index,
+                          gpointer data)
 {
-  PsppireDataStore *store  ;
+  PsppireDataStore *store  = PSPPIRE_DATA_STORE (data);
 
-  g_return_if_fail (data);
+  g_return_if_fail (store->datasheet);
 
-  store  = PSPPIRE_DATA_STORE(data);
-  
-  g_sheet_model_range_changed (G_SHEET_MODEL(store),
-			       casenum, -1,
-			       psppire_case_file_get_case_count(store->case_file),
-			       -1);
-
-  g_sheet_model_rows_inserted (G_SHEET_MODEL(store), casenum, 1);
+  datasheet_delete_columns (store->datasheet, case_index, 1);
+  datasheet_insert_column (store->datasheet, NULL, -1, case_index);
 }
 
+struct resize_datum_aux
+  {
+    const struct dictionary *dict;
+    const struct variable *new_variable;
+    const struct variable *old_variable;
+  };
 
 static void
-changed_case_callback(GtkWidget *w, gint casenum, gpointer data)
+resize_datum (const union value *old, union value *new, const void *aux_)
 {
-  PsppireDataStore *store  ;
-  g_return_if_fail (data);
-
-  store  = PSPPIRE_DATA_STORE(data);
-  
-  g_sheet_model_range_changed (G_SHEET_MODEL(store),
-				 casenum, -1,
-				 casenum, -1);
+  const struct resize_datum_aux *aux = aux_;
+  int new_width = var_get_width (aux->new_variable);
+  const char *enc = dict_get_encoding (aux->dict);
+  const struct fmt_spec *newfmt = var_get_print_format (aux->new_variable);
+  char *s = data_out (old, enc, var_get_print_format (aux->old_variable));
+  enum fmt_type type = (fmt_usable_for_input (newfmt->type)
+                        ? newfmt->type
+                        : FMT_DOLLAR);
+  free (data_in (ss_cstr (s), enc, type, new, new_width, enc));
+  free (s);
 }
 
-
 static void
-delete_variables_callback(GObject *obj, gint var_num, gint n_vars, gpointer data)
+variable_changed_callback (GObject *obj, gint var_num, guint what, const struct variable *oldvar,
+			   gpointer data)
 {
-  PsppireDataStore *store ;
-
-  g_return_if_fail (data);
+  PsppireDataStore *store  = PSPPIRE_DATA_STORE (data);
+  struct variable *variable = psppire_dict_get_variable (store->dict, var_num);
 
-  store  = PSPPIRE_DATA_STORE(data);
-
-  g_sheet_model_columns_deleted (G_SHEET_MODEL(store), var_num, n_vars);
-
-  g_sheet_column_columns_changed(G_SHEET_COLUMN(store),
-				   var_num, -1);
-}
-
-static void
-insert_variable_callback(GObject *obj, gint var_num, gpointer data)
-{
-  PsppireDataStore *store;
-  gint posn;
-
-  g_return_if_fail (data);
-
-  store  = PSPPIRE_DATA_STORE(data);
-  
-  if ( var_num > 0 ) 
+  if (what & VAR_TRAIT_WIDTH)
     {
-      struct PsppireVariable *variable;
-      variable = psppire_dict_get_variable(store->dict, var_num);
-
-      posn = psppire_variable_get_fv(variable);
+      int posn = var_get_case_index (variable);
+      struct resize_datum_aux aux;
+      aux.old_variable = oldvar;
+      aux.new_variable = variable;
+      aux.dict = store->dict->dict;
+      datasheet_resize_column (store->datasheet, posn, var_get_width (variable),
+                               resize_datum, &aux);
     }
-  else
-    {
-      posn = 0;
-    }
-
-  psppire_case_file_insert_values(store->case_file, 1, posn);
-
-  g_sheet_column_columns_changed(G_SHEET_COLUMN(store),
-				  var_num, 1);
-
-  g_sheet_model_columns_inserted (G_SHEET_MODEL(store), var_num, 1);
 }
 
-
 static void
-dict_size_change_callback(GObject *obj, 
-			  gint posn, gint adjustment, gpointer data)
+insert_variable_callback (GObject *obj, gint var_num, gpointer data)
 {
-  PsppireDataStore *store ;
+  struct variable *variable;
+  PsppireDataStore *store;
+  gint posn;
 
   g_return_if_fail (data);
 
-  store  = PSPPIRE_DATA_STORE(data);
+  store  = PSPPIRE_DATA_STORE (data);
 
-  psppire_case_file_insert_values (store->case_file, adjustment, posn);
+  variable = psppire_dict_get_variable (store->dict, var_num);
+  posn = var_get_case_index (variable);
+  psppire_data_store_insert_value (store, var_get_width (variable), posn);
 }
 
-
-
 /**
  * psppire_data_store_new:
  * @dict: The dictionary for this data_store.
@@ -345,14 +280,36 @@ psppire_data_store_new (PsppireDict *dict)
 {
   PsppireDataStore *retval;
 
-  retval = g_object_new (GTK_TYPE_DATA_STORE, NULL);
-
-  psppire_data_store_set_dictionary(retval, dict);
+  retval = g_object_new (PSPPIRE_TYPE_DATA_STORE, NULL);
 
+  psppire_data_store_set_dictionary (retval, dict);
 
   return retval;
 }
 
+void
+psppire_data_store_set_reader (PsppireDataStore *ds,
+			       struct casereader *reader)
+{
+  gint i;
+
+  if ( ds->datasheet)
+    datasheet_destroy (ds->datasheet);
+
+  ds->datasheet = datasheet_create (reader);
+
+  if ( ds->dict )
+    for (i = 0 ; i < n_dict_signals; ++i )
+      {
+	if ( ds->dict_handler_id [i] > 0)
+	  {
+	    g_signal_handler_unblock (ds->dict,
+				      ds->dict_handler_id[i]);
+	  }
+      }
+
+  g_signal_emit (ds, signals[BACKEND_CHANGED], 0);
+}
 
 
 /**
@@ -364,463 +321,396 @@ psppire_data_store_new (PsppireDict *dict)
  * destroyed.
  **/
 void
-psppire_data_store_set_dictionary(PsppireDataStore *data_store, PsppireDict *dict)
+psppire_data_store_set_dictionary (PsppireDataStore *data_store, PsppireDict *dict)
 {
-  gint var_cnt = psppire_dict_get_next_value_idx(dict);
-#if 0
-  if ( data_store->dict ) g_object_unref(data_store->dict);
-#endif
+  int i;
+
+  /* Disconnect any existing handlers */
+  if ( data_store->dict )
+    for (i = 0 ; i < n_dict_signals; ++i )
+      {
+	g_signal_handler_disconnect (data_store->dict,
+				     data_store->dict_handler_id[i]);
+      }
 
   data_store->dict = dict;
 
-  if ( data_store->case_file)
+  if ( dict != NULL)
     {
-      g_object_unref(data_store->case_file);
-      data_store->case_file = 0;
-    }
-
-  data_store->case_file = psppire_case_file_new(var_cnt);
-
-  g_signal_connect(data_store->case_file, "cases-deleted", 
-		   G_CALLBACK(delete_cases_callback), 
-		   data_store);
 
-  g_signal_connect(data_store->case_file, "case-inserted", 
-		   G_CALLBACK(insert_case_callback), 
-		   data_store);
+      data_store->dict_handler_id [VARIABLE_INSERTED] =
+	g_signal_connect (dict, "variable-inserted",
+			  G_CALLBACK (insert_variable_callback),
+			  data_store);
 
+      data_store->dict_handler_id [VARIABLE_DELETED] =
+	g_signal_connect (dict, "variable-deleted",
+			  G_CALLBACK (delete_variable_callback),
+			  data_store);
 
-  g_signal_connect(data_store->case_file, "case-changed", 
-		   G_CALLBACK(changed_case_callback), 
-		   data_store);
-
-  g_signal_connect(dict, "variable-inserted", 
-		   G_CALLBACK(insert_variable_callback), 
-		   data_store);
+      data_store->dict_handler_id [VARIABLE_CHANGED] =
+	g_signal_connect (dict, "variable-changed",
+			  G_CALLBACK (variable_changed_callback),
+			  data_store);
+    }
 
-  g_signal_connect(dict, "variables-deleted", 
-		   G_CALLBACK(delete_variables_callback), 
-		   data_store);
 
-  g_signal_connect (dict, "dict-size-changed", 
-		    G_CALLBACK(dict_size_change_callback),
-		    data_store);
 
   /* The entire model has changed */
-  g_sheet_model_range_changed (G_SHEET_MODEL(data_store), -1, -1, -1, -1);
-  
-  g_sheet_column_columns_changed(G_SHEET_COLUMN(data_store), 0, -1);
+
+  if ( data_store->dict )
+    for (i = 0 ; i < n_dict_signals; ++i )
+      {
+	if ( data_store->dict_handler_id [i] > 0)
+	  {
+	    g_signal_handler_block (data_store->dict,
+				    data_store->dict_handler_id[i]);
+	  }
+      }
 }
 
 static void
 psppire_data_store_finalize (GObject *object)
 {
+  PsppireDataStore *ds = PSPPIRE_DATA_STORE (object);
+
+  if (ds->datasheet)
+    {
+      datasheet_destroy (ds->datasheet);
+      ds->datasheet = NULL;
+    }
 
   /* must chain up */
   (* parent_class->finalize) (object);
 }
 
 
+static void
+psppire_data_store_dispose (GObject *object)
+{
+  PsppireDataStore *ds = PSPPIRE_DATA_STORE (object);
+
+  if (ds->dispose_has_run)
+    return;
+
+  psppire_data_store_set_dictionary (ds, NULL);
+
+  /* must chain up */
+  (* parent_class->dispose) (object);
+
+  ds->dispose_has_run = TRUE;
+}
+
+
 
 /* Insert a blank case before POSN */
 gboolean
-psppire_data_store_insert_new_case(PsppireDataStore *ds, gint posn)
+psppire_data_store_insert_new_case (PsppireDataStore *ds, casenumber posn)
 {
   gboolean result;
-  gint val_cnt, v; 
-  struct ccase cc;
+  const struct caseproto *proto;
+  struct ccase *cc;
   g_return_val_if_fail (ds, FALSE);
 
+  proto = datasheet_get_proto (ds->datasheet);
+  g_return_val_if_fail (caseproto_get_n_widths (proto) > 0, FALSE);
+  g_return_val_if_fail (posn <= psppire_data_store_get_case_count (ds), FALSE);
 
-  /* Opportunity for optimisation exists here when creating a blank case */
-  val_cnt = casefile_get_value_cnt(ds->case_file->flexifile) ;
-  
-  case_create (&cc, val_cnt);
-
-  memset ( case_data_rw (&cc, 0), 0, val_cnt * MAX_SHORT_STRING);
-
-  for (v = 0 ; v < psppire_dict_get_var_cnt (ds->dict) ; ++v) 
-    {
-      const struct PsppireVariable *pv = psppire_dict_get_variable(ds->dict, v);
-      if (VAR_STRING ==  psppire_variable_get_type(pv) ) 
-	continue;
-
-      case_data_rw_idx (&cc, psppire_variable_get_fv (pv))->f = SYSMIS;
-    }
+  cc = case_create (proto);
+  case_set_missing (cc);
 
-  result = psppire_case_file_insert_case (ds->case_file, &cc, posn);
+  result = psppire_data_store_insert_case (ds, cc, posn);
 
-  case_destroy (&cc);
+  case_unref (cc);
 
   return result;
 }
 
-
-static gchar *
-psppire_data_store_get_string (const GSheetModel *model, gint row, gint column)
+gchar *
+psppire_data_store_get_string (PsppireDataStore *store,
+                               glong row, const struct variable *var,
+                               bool use_value_label)
 {
-  gint idx;
-  char *text;
-  const struct fmt_spec *fp ;
-  const struct PsppireVariable *pv ;
-  const union value *v ;
-  GString *s;
-  PsppireDataStore *store = PSPPIRE_DATA_STORE(model);
-
-  g_return_val_if_fail (store->dict, NULL);
-  g_return_val_if_fail (store->case_file, NULL);
-
-  if (column >= psppire_dict_get_var_cnt (store->dict))
-    return NULL;
-
-  if ( row >= psppire_case_file_get_case_count (store->case_file))
-    return NULL;
-
-  pv = psppire_dict_get_variable (store->dict, column);
+  gchar *string;
+  union value v;
+  int width;
 
-  idx = psppire_variable_get_fv (pv);
+  g_return_val_if_fail (store != NULL, NULL);
+  g_return_val_if_fail (store->datasheet != NULL, NULL);
+  g_return_val_if_fail (var != NULL, NULL);
 
-  v = psppire_case_file_get_value (store->case_file, row, idx);
+  if (row < 0 || row >= datasheet_get_n_rows (store->datasheet))
+    return NULL;
 
-  g_return_val_if_fail(v, NULL);
+  width = var_get_width (var);
+  value_init (&v, width);
+  datasheet_get_value (store->datasheet, row, var_get_case_index (var), &v);
 
-  if ( store->show_labels) 
+  string = NULL;
+  if (use_value_label)
     {
-      const struct val_labs * vl = psppire_variable_get_value_labels (pv);
-
-      const gchar *label;
-      if ( (label = val_labs_find(vl, *v)) )
-	{
-	  return pspp_locale_to_utf8(label, -1, 0);
-	}
+      const char *label = var_lookup_value_label (var, &v);
+      if (label != NULL)
+        string = g_strdup (label);
     }
+  if (string == NULL)
+    string = value_to_text (v, var);
 
-  fp = psppire_variable_get_write_spec (pv);
-
-  s = g_string_sized_new (fp->w + 1);
-  g_string_set_size (s, fp->w);
-  
-  memset (s->str, 0, fp->w);
-
-  g_assert (fp->w == s->len);
-    
-  /* Converts binary value V into printable form in the exactly
-     FP->W character in buffer S according to format specification
-     FP.  No null terminator is appended to the buffer.  */
-  data_out (v, fp, s->str);
-
-  text = pspp_locale_to_utf8 (s->str, fp->w, 0);
-  g_string_free (s, TRUE);
-
-  g_strchomp (text);
-
-  return text;
-}
-
-
-static gboolean 
-psppire_data_store_clear_datum (GSheetModel *model, 
-					  gint row, gint col)
-
-{
-  PsppireDataStore *store = PSPPIRE_DATA_STORE(model);
-
-  union value v;
-  const struct PsppireVariable *pv = psppire_dict_get_variable(store->dict, col);
-
-  const gint index = psppire_variable_get_fv(pv) ;
-
-  if ( psppire_variable_get_type(pv) == VAR_NUMERIC) 
-    v.f = SYSMIS;
-  else
-    memcpy(v.s, "", MAX_SHORT_STRING);
+  value_destroy (&v, width);
 
-  psppire_case_file_set_value(store->case_file, row, index, &v, 
-			      psppire_variable_get_width(pv));
-  return TRUE;
+  return string;
 }
 
 
-/* Attempts to update that part of the variable store which corresponds 
-   to ROW, COL with  the value TEXT.
-   Returns true if anything was updated, false otherwise.
-*/
-static gboolean 
-psppire_data_store_set_string(GSheetModel *model, 
-			  const gchar *text, gint row, gint col)
-{
-  PsppireDataStore *store = PSPPIRE_DATA_STORE(model);
+/* Attempts to update that part of the variable store which corresponds to VAR
+   within ROW with the value TEXT.
 
-  const struct PsppireVariable *pv = psppire_dict_get_variable(store->dict, col);
-  g_return_val_if_fail(pv, FALSE);
+   If USE_VALUE_LABEL is true, and TEXT is a value label for the column's
+   variable, then stores the value from that value label instead of the literal
+   TEXT.
 
-#if 0
-  /* Allow the user to insert a lot of blank cases, simply by skipping rows */
-  for(r = psppire_case_file_get_case_count(store->case_file); r <= row ; ++r) 
+   Returns true if anything was updated, false otherwise.  */
+gboolean
+psppire_data_store_set_string (PsppireDataStore *store,
+			       const gchar *text,
+                               glong row, const struct variable *var,
+                               gboolean use_value_label)
+{
+  gint case_index;
+  glong n_cases;
+  gboolean ok;
+
+  n_cases = psppire_data_store_get_case_count (store);
+  if (row > n_cases)
+    return FALSE;
+  if (row == n_cases)
+    psppire_data_store_insert_new_case (store, row);
+
+  case_index = var_get_case_index (var);
+  if (use_value_label)
     {
-
-      gint c;
-
-      psppire_case_array_insert_case(store->cases, r, 0, 0);
-
-
-      for (c = 0 ; c < psppire_dict_get_var_cnt(store->dict); ++c ) 
-	psppire_data_store_clear_datum(model, r, c);
+      const struct val_labs *vls = var_get_value_labels (var);
+      const union value *value = vls ? val_labs_find_value (vls, text) : NULL;
+      if (value)
+        ok = datasheet_put_value (store->datasheet, row, case_index, value);
+      else
+        ok = FALSE;
     }
-#endif
+  else
+    ok = psppire_data_store_data_in (store, row, case_index, ss_cstr (text),
+                                     var_get_print_format (var));
 
-  psppire_case_file_data_in (store->case_file, row,
-                             psppire_variable_get_fv (pv), ss_cstr (text),
-                             psppire_variable_get_write_spec (pv));
-  
-  return TRUE;
+  if (ok)
+    g_signal_emit (store, signals [CASE_CHANGED], 0, row);
+  return ok;
 }
 
 
-void
-psppire_data_store_set_font(PsppireDataStore *store, 
-			    const PangoFontDescription *fd)
-{
-  g_return_if_fail (store);
-  g_return_if_fail (PSPPIRE_IS_DATA_STORE (store));
-
-  store->font_desc = fd;
-#if 0
-  store->width_of_m = calc_m_width(fd);
-#endif
-  g_signal_emit(store, signal[FONT_CHANGED], 0);  
-
-
-  g_sheet_model_range_changed (G_SHEET_MODEL(store),
-				 -1, -1, -1, -1);
-}
-
 
 void
-psppire_data_store_show_labels(PsppireDataStore *store, gboolean show_labels)
+psppire_data_store_clear (PsppireDataStore *ds)
 {
-  g_return_if_fail (store);
-  g_return_if_fail (PSPPIRE_IS_DATA_STORE (store));
+  datasheet_destroy (ds->datasheet);
+  ds->datasheet = NULL;
 
-  store->show_labels = show_labels;
+  psppire_dict_clear (ds->dict);
 
-  g_sheet_model_range_changed (G_SHEET_MODEL(store),
-				 -1, -1, -1, -1);
+  g_signal_emit (ds, signals [CASES_DELETED], 0, 0, -1);
 }
 
 
 
-/* FIXME: There's no reason to actually have this function.
-   It should be done by a procedure */
-void
-psppire_data_store_create_system_file(PsppireDataStore *store,
-			      struct file_handle *handle)
+/* Return a casereader made from this datastore */
+struct casereader *
+psppire_data_store_get_reader (PsppireDataStore *ds)
 {
-  gint i, var_cnt;
-  const struct sfm_write_options wo = {
-    true, /* writeable */
-    false, /* dont compress */
-    3 /* version */
-  }; 
-
-  struct sfm_writer *writer ;
-
-  g_assert(handle);
-
-  writer = sfm_open_writer(handle, store->dict->dict, wo);
-
-  if ( ! writer) 
-    return;
-
-
-  var_cnt = psppire_data_store_get_var_count (G_SHEET_MODEL(store));
-
-  for (i = 0 ; i < psppire_case_file_get_case_count(store->case_file); ++i ) 
-    {
-      struct ccase c;
-      
-      case_create (&c, var_cnt);
-      psppire_case_file_get_case (store->case_file, i, &c);
-      sfm_write_case (writer, &c);
-
-      case_destroy (&c);
-    }
-
-  sfm_close_writer(writer);
-}
+  int i;
+  struct casereader *reader ;
 
+  if ( ds->dict )
+    for (i = 0 ; i < n_dict_signals; ++i )
+      {
+	g_signal_handler_block (ds->dict,
+				ds->dict_handler_id[i]);
+      }
 
+  reader = datasheet_make_reader (ds->datasheet);
 
-void 
-psppire_data_store_clear(PsppireDataStore *data_store)
-{
-  psppire_case_file_clear(data_store->case_file);
+  /* We must not reference this again */
+  ds->datasheet = NULL;
 
-  psppire_dict_clear(data_store->dict);
+  return reader;
 }
 
-
-
-
-/* Column related funcs */
-
-static gint
-geometry_get_column_count(const GSheetColumn *geom)
+/* Returns the CASENUMth case, or a null pointer on failure.
+ */
+struct ccase *
+psppire_data_store_get_case (const PsppireDataStore *ds,
+			     casenumber casenum)
 {
-  PsppireDataStore *ds = PSPPIRE_DATA_STORE(geom);
+  g_return_val_if_fail (ds, FALSE);
+  g_return_val_if_fail (ds->datasheet, FALSE);
 
-  return MAX(MIN_COLUMNS, psppire_dict_get_var_cnt(ds->dict));
+  return datasheet_get_row (ds->datasheet, casenum);
 }
 
 
-
-static gint
-geometry_get_width(const GSheetColumn *geom, gint unit)
+gboolean
+psppire_data_store_delete_cases (PsppireDataStore *ds, casenumber first,
+				 casenumber n_cases)
 {
-  const struct PsppireVariable *pv ;
-  PsppireDataStore *ds = PSPPIRE_DATA_STORE(geom);
+  g_return_val_if_fail (ds, FALSE);
+  g_return_val_if_fail (ds->datasheet, FALSE);
 
-  if ( unit >= psppire_dict_get_var_cnt(ds->dict) )
-    return ds->width_of_m * 8 ;
+  g_return_val_if_fail (first + n_cases <=
+			psppire_data_store_get_case_count (ds), FALSE);
 
-  pv = psppire_dict_get_variable(ds->dict, unit);
 
-  if ( pv == NULL ) 
-    return ds->width_of_m * 8 ;
+  datasheet_delete_rows (ds->datasheet, first, n_cases);
 
-  return ds->width_of_m * psppire_variable_get_columns(pv);
-}
-
-static void
-geometry_set_width(GSheetColumn *geom, gint unit, gint width)
-{
-  PsppireDataStore *ds = PSPPIRE_DATA_STORE(geom);
+  g_signal_emit (ds, signals [CASES_DELETED], 0, first, n_cases);
 
-  struct PsppireVariable *pv = psppire_dict_get_variable(ds->dict, unit);
-
-  psppire_variable_set_columns(pv, width / ds->width_of_m );
+  return TRUE;
 }
 
 
 
-static GtkJustification
-geometry_get_justification(const GSheetColumn *geom, gint unit)
+/* Insert case CC into the case file before POSN */
+static gboolean
+psppire_data_store_insert_case (PsppireDataStore *ds,
+				struct ccase *cc,
+				casenumber posn)
 {
-  PsppireDataStore *ds = PSPPIRE_DATA_STORE(geom);
-  const struct PsppireVariable *pv ;
+  bool result ;
 
+  g_return_val_if_fail (ds, FALSE);
+  g_return_val_if_fail (ds->datasheet, FALSE);
 
-  if ( unit >= psppire_dict_get_var_cnt(ds->dict) )
-    return GTK_JUSTIFY_LEFT;
+  cc = case_ref (cc);
+  result = datasheet_insert_rows (ds->datasheet, posn, &cc, 1);
 
-  pv = psppire_dict_get_variable(ds->dict, unit);
+  if ( result )
+    g_signal_emit (ds, signals [CASE_INSERTED], 0, posn);
+  else
+    g_warning ("Cannot insert case at position %ld\n", posn);
 
-  /* Kludge: Happily GtkJustification is defined similarly
-     to enum alignment from pspp/variable.h */
-  return psppire_variable_get_alignment(pv);
+  return result;
 }
 
 
-static const gchar null_var_name[]=N_("var");
- 
-static gchar *
-geometry_get_column_button_label(const GSheetColumn *geom, gint unit)
+/* Set the value of VAR in case CASENUM to V.
+   V must be the correct width for IDX.
+   Returns true if successful, false on I/O error. */
+gboolean
+psppire_data_store_set_value (PsppireDataStore *ds, casenumber casenum,
+			      const struct variable *var, const union value *v)
 {
-  gchar *text;
-  struct PsppireVariable *pv ;
-  PsppireDataStore *ds = PSPPIRE_DATA_STORE(geom);
+  glong n_cases;
+  bool ok;
+
+  g_return_val_if_fail (ds, FALSE);
+  g_return_val_if_fail (ds->datasheet, FALSE);
 
-  if ( unit >= psppire_dict_get_var_cnt(ds->dict) )
-    return g_locale_to_utf8(null_var_name, -1, 0, 0, 0);
+  n_cases = psppire_data_store_get_case_count (ds);
+  if ( casenum > n_cases)
+    return FALSE;
 
-  pv = psppire_dict_get_variable(ds->dict, unit);
+  if (casenum == n_cases)
+    psppire_data_store_insert_new_case (ds, casenum);
 
-  text =  pspp_locale_to_utf8(psppire_variable_get_name(pv), -1, 0);
+  ok = datasheet_put_value (ds->datasheet, casenum, var_get_case_index (var),
+                            v);
+  if (ok)
+    g_signal_emit (ds, signals [CASE_CHANGED], 0, casenum);
 
-  return text;
+  return ok;
 }
 
 
-static gboolean
-geometry_get_sensitivity(const GSheetColumn *geom, gint unit)
-{
-  PsppireDataStore *ds = PSPPIRE_DATA_STORE(geom);
-
-  return (unit < psppire_dict_get_var_cnt(ds->dict));
-}
 
 
-static void
-psppire_data_store_sheet_column_init (GSheetColumnIface *iface)
+/* Set the IDXth value of case C using D_IN */
+static gboolean
+psppire_data_store_data_in (PsppireDataStore *ds, casenumber casenum, gint idx,
+			    struct substring input, const struct fmt_spec *fmt)
 {
-  iface->get_column_count = geometry_get_column_count;
-  iface->get_width = geometry_get_width;
-  iface->set_width = geometry_set_width;
-  iface->get_visibility = always_true;
-  iface->get_sensitivity = geometry_get_sensitivity;
-  iface->get_justification = geometry_get_justification;
-  iface->get_button_label = geometry_get_column_button_label;
-}
+  union value value;
+  int width;
+  bool ok;
 
+  PsppireDict *dict;
 
-/* Row related funcs */
+  g_return_val_if_fail (ds, FALSE);
+  g_return_val_if_fail (ds->datasheet, FALSE);
 
-static gint
-geometry_get_row_count(const GSheetRow *geom, gpointer data)
-{
-  PsppireDataStore *ds = PSPPIRE_DATA_STORE(geom);
+  g_return_val_if_fail (idx < datasheet_get_n_columns (ds->datasheet), FALSE);
 
-  return TRAILING_ROWS + psppire_case_file_get_case_count(ds->case_file);
-}
+  dict = ds->dict;
 
+  width = fmt_var_width (fmt);
+  g_return_val_if_fail (caseproto_get_width (
+                          datasheet_get_proto (ds->datasheet), idx) == width,
+                        FALSE);
+  value_init (&value, width);
+  ok = (datasheet_get_value (ds->datasheet, casenum, idx, &value)
+        && data_in_msg (input, UTF8, fmt->type, &value, width,
+                        dict_get_encoding (dict->dict))
+        && datasheet_put_value (ds->datasheet, casenum, idx, &value));
+  value_destroy (&value, width);
 
-static gint
-geometry_get_height(const GSheetRow *geom, gint unit, gpointer data)
-{
-  return 25;
+  return ok;
 }
 
-
+/* Resize the cases in the casefile, by inserting a value of the
+   given WIDTH into every one of them at the position immediately
+   preceding WHERE.
+*/
 static gboolean
-geometry_get_row_sensitivity(const GSheetRow *geom, gint unit, gpointer data)
+psppire_data_store_insert_value (PsppireDataStore *ds,
+                                 gint width, gint where)
 {
-  PsppireDataStore *ds = PSPPIRE_DATA_STORE(geom);
+  union value value;
 
-  
-  return (unit < psppire_case_file_get_case_count(ds->case_file));
-}
+  g_return_val_if_fail (ds, FALSE);
 
+  g_assert (width >= 0);
 
-static gchar *
-geometry_get_row_button_label(const GSheetRow *geom, gint unit, gpointer data)
-{
-  gchar *text;
-  gchar *s;
-  PsppireDataStore *ds = PSPPIRE_DATA_STORE(geom);
+  if ( ! ds->datasheet )
+    ds->datasheet = datasheet_create (NULL);
 
-  if ( unit > 
-       TRAILING_ROWS + psppire_case_file_get_case_count(ds->case_file))
-    return 0;
+  value_init (&value, width);
+  value_set_missing (&value, width);
 
-  s = g_strdup_printf(_("%d"), unit);
+  datasheet_insert_column (ds->datasheet, &value, width, where);
+  value_destroy (&value, width);
 
-  text =  pspp_locale_to_utf8(s, -1, 0);
-  
-  g_free(s);
-  
-  return text;
+  return TRUE;
 }
 
-
-static void
-psppire_data_store_sheet_row_init (GSheetRowIface *iface)
+gboolean
+psppire_data_store_filtered (PsppireDataStore *ds,
+                             glong row)
 {
-  iface->get_row_count = geometry_get_row_count;
+  union value val;
+
+  const struct dictionary *dict;
+  const struct variable *filter;
+
+  if ( row < 0 || row >= datasheet_get_n_rows (ds->datasheet))
+    return FALSE;
+
+  dict = ds->dict->dict;
+  g_return_val_if_fail (dict, FALSE);
+  filter = dict_get_filter (dict);
+  if ( ! filter)
+    return FALSE;
 
-  iface->get_height = geometry_get_height;
-  iface->set_height = 0;
-  iface->get_visibility = always_true;
-  iface->get_sensitivity = geometry_get_row_sensitivity;
+  g_return_val_if_fail (var_is_numeric (filter), FALSE);
+  value_init (&val, 0);
+  if ( ! datasheet_get_value (ds->datasheet, row,
+                              var_get_case_index (filter),
+                              &val) )
+    return FALSE;
 
-  iface->get_button_label = geometry_get_row_button_label;
+  return (val.f == 0.0);
 }