[gtk/wip/otte/listview: 16/150] filter: Add GtkStringFilter

[Benjamin Otte <otte src gnome org>]

commit 02619e8a474bed13b70f24b347f2b439374d1dbe
Author: Benjamin Otte <otte redhat com>
Date:   Sat Nov 16 22:15:51 2019 +0100

    filter: Add GtkStringFilter
    
    Users provide a search filter and an expression that evaluates the items
    to a string and then the filter goes and matches those strings to the
    search term.

 gtk/gtk.h              |   1 +
 gtk/gtkstringfilter.c  | 468 +++++++++++++++++++++++++++++++++++++++++++++++++
 gtk/gtkstringfilter.h  |  81 +++++++++
 gtk/meson.build        |   2 +
 testsuite/gtk/filter.c | 156 +++++++++++++++++
 5 files changed, 708 insertions(+)
---
diff --git a/gtk/gtk.h b/gtk/gtk.h
index cdc1b14d2e..0cd3061260 100644
--- a/gtk/gtk.h
+++ b/gtk/gtk.h
@@ -227,6 +227,7 @@
 #include <gtk/gtkstack.h>
 #include <gtk/gtkstackswitcher.h>
 #include <gtk/gtkstatusbar.h>
+#include <gtk/gtkstringfilter.h>
 #include <gtk/gtkstylecontext.h>
 #include <gtk/gtkstyleprovider.h>
 #include <gtk/gtkswitch.h>
diff --git a/gtk/gtkstringfilter.c b/gtk/gtkstringfilter.c
new file mode 100644
index 0000000000..77fa66b5b2
--- /dev/null
+++ b/gtk/gtkstringfilter.c
@@ -0,0 +1,468 @@
+/*
+ * Copyright © 2019 Benjamin Otte
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Benjamin Otte <otte gnome org>
+ */
+
+#include "config.h"
+
+#include "gtkstringfilter.h"
+
+#include "gtkintl.h"
+#include "gtktypebuiltins.h"
+
+struct _GtkStringFilter
+{
+  GtkFilter parent_instance;
+
+  char *search;
+  char *search_prepared;
+
+  gboolean ignore_case;
+  GtkStringFilterMatchMode match_mode;
+
+  GtkExpression *expression;
+};
+
+enum {
+  PROP_0,
+  PROP_EXPRESSION,
+  PROP_IGNORE_CASE,
+  PROP_MATCH_MODE,
+  PROP_SEARCH,
+  NUM_PROPERTIES
+};
+
+G_DEFINE_TYPE (GtkStringFilter, gtk_string_filter, GTK_TYPE_FILTER)
+
+static GParamSpec *properties[NUM_PROPERTIES] = { NULL, };
+
+static char *
+gtk_string_filter_prepare (GtkStringFilter *self,
+                           const char      *s)
+{
+  char *tmp;
+  char *result;
+
+  if (s == NULL || s[0] == '\0')
+    return NULL;
+
+  tmp = g_utf8_normalize (s, -1, G_NORMALIZE_ALL);
+
+  if (!self->ignore_case)
+    return tmp;
+
+  result = g_utf8_casefold (tmp, -1);
+  g_free (tmp);
+
+  return result;
+}
+
+static gboolean
+gtk_string_filter_match (GtkFilter *filter,
+                         gpointer   item)
+{
+  GtkStringFilter *self = GTK_STRING_FILTER (filter);
+  GValue value = G_VALUE_INIT;
+  char *prepared;
+  const char *s;
+  gboolean result;
+
+  if (self->search_prepared == NULL)
+    return TRUE;
+
+  if (self->expression == NULL ||
+      !gtk_expression_evaluate (self->expression, item, &value))
+    return FALSE;
+  s = g_value_get_string (&value);
+  if (s == NULL)
+    return FALSE;
+  prepared = gtk_string_filter_prepare (self, s);
+
+  switch (self->match_mode)
+    {
+    case GTK_STRING_FILTER_MATCH_MODE_EXACT:
+      result = strcmp (prepared, self->search_prepared) == 0;
+      break;
+    case GTK_STRING_FILTER_MATCH_MODE_SUBSTRING:
+      result = strstr (prepared, self->search_prepared) != NULL;
+      break;
+    case GTK_STRING_FILTER_MATCH_MODE_PREFIX:
+      result = g_str_has_prefix (prepared, self->search_prepared);
+      break;
+    default:
+      g_assert_not_reached ();
+    }
+
+#if 0
+  g_print ("%s (%s) %s %s (%s)\n", s, prepared, result ? "==" : "!=", self->search, self->search_prepared);
+#endif
+
+  g_free (prepared);
+  g_value_unset (&value);
+
+  return result;
+}
+
+static GtkFilterMatch
+gtk_string_filter_get_strictness (GtkFilter *filter)
+{
+  GtkStringFilter *self = GTK_STRING_FILTER (filter);
+
+  if (self->search == NULL)
+    return GTK_FILTER_MATCH_ALL;
+
+  if (self->expression == NULL)
+    return GTK_FILTER_MATCH_NONE;
+
+  return GTK_FILTER_MATCH_SOME;
+}
+
+static void
+gtk_string_filter_set_property (GObject      *object,
+                                guint         prop_id,
+                                const GValue *value,
+                                GParamSpec   *pspec)
+{
+  GtkStringFilter *self = GTK_STRING_FILTER (object);
+
+  switch (prop_id)
+    {
+    case PROP_EXPRESSION:
+      gtk_string_filter_set_expression (self, g_value_get_boxed (value));
+      break;
+
+    case PROP_IGNORE_CASE:
+      gtk_string_filter_set_ignore_case (self, g_value_get_boolean (value));
+      break;
+
+    case PROP_MATCH_MODE:
+      gtk_string_filter_set_match_mode (self, g_value_get_enum (value));
+      break;
+
+    case PROP_SEARCH:
+      gtk_string_filter_set_search (self, g_value_get_string (value));
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+    }
+}
+
+static void 
+gtk_string_filter_get_property (GObject     *object,
+                                guint        prop_id,
+                                GValue      *value,
+                                GParamSpec  *pspec)
+{
+  GtkStringFilter *self = GTK_STRING_FILTER (object);
+
+  switch (prop_id)
+    {
+    case PROP_EXPRESSION:
+      g_value_set_boxed (value, self->expression);
+      break;
+
+    case PROP_IGNORE_CASE:
+      g_value_set_boolean (value, self->ignore_case);
+      break;
+
+    case PROP_MATCH_MODE:
+      g_value_set_enum (value, self->match_mode);
+      break;
+
+    case PROP_SEARCH:
+      g_value_set_string (value, self->search);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+    }
+}
+
+static void
+gtk_string_filter_dispose (GObject *object)
+{
+  GtkStringFilter *self = GTK_STRING_FILTER (object);
+
+  g_clear_pointer (&self->search, g_free);
+  g_clear_pointer (&self->search_prepared, g_free);
+  g_clear_pointer (&self->expression, gtk_expression_unref);
+
+  G_OBJECT_CLASS (gtk_string_filter_parent_class)->dispose (object);
+}
+
+static void
+gtk_string_filter_class_init (GtkStringFilterClass *class)
+{
+  GtkFilterClass *filter_class = GTK_FILTER_CLASS (class);
+  GObjectClass *object_class = G_OBJECT_CLASS (class);
+
+  filter_class->match = gtk_string_filter_match;
+  filter_class->get_strictness = gtk_string_filter_get_strictness;
+
+  object_class->get_property = gtk_string_filter_get_property;
+  object_class->set_property = gtk_string_filter_set_property;
+  object_class->dispose = gtk_string_filter_dispose;
+
+  /**
+   * GtkStringFilter:expression:
+   *
+   * The expression to evalute on item to get a string to compare with
+   */
+  properties[PROP_EXPRESSION] =
+      g_param_spec_boxed ("expression",
+                          P_("Expression"),
+                          P_("Expression to compare with"),
+                          GTK_TYPE_EXPRESSION,
+                          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | G_PARAM_EXPLICIT_NOTIFY);
+
+  /**
+   * GtkStringFilter:ignore-case:
+   *
+   * If matching is case sensitive
+   */
+  properties[PROP_IGNORE_CASE] =
+      g_param_spec_boolean ("ignore-case",
+                            P_("Ignore case"),
+                            P_("If matching is case sensitive"),
+                            TRUE,
+                            G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | G_PARAM_EXPLICIT_NOTIFY);
+
+  /**
+   * GtkStringFilter:match-mode:
+   *
+   * If exact matches are necessary or if substrings are allowed
+   */
+  properties[PROP_MATCH_MODE] =
+      g_param_spec_enum ("match-mode",
+                         P_("Match mode"),
+                         P_("If exact matches are necessary or if substrings are allowed"),
+                         GTK_TYPE_STRING_FILTER_MATCH_MODE,
+                         GTK_STRING_FILTER_MATCH_MODE_SUBSTRING,
+                         G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | G_PARAM_EXPLICIT_NOTIFY);
+
+  /**
+   * GtkStringFilter:search:
+   *
+   * The search term
+   */
+  properties[PROP_SEARCH] =
+      g_param_spec_string ("search",
+                           P_("Search"),
+                           P_("The search term"),
+                           NULL,
+                           G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | G_PARAM_EXPLICIT_NOTIFY);
+
+  g_object_class_install_properties (object_class, NUM_PROPERTIES, properties);
+
+}
+
+static void
+gtk_string_filter_init (GtkStringFilter *self)
+{
+  self->ignore_case = TRUE;
+  self->match_mode = GTK_STRING_FILTER_MATCH_MODE_SUBSTRING;
+
+  gtk_filter_changed (GTK_FILTER (self), GTK_FILTER_CHANGE_MATCH_ALL);
+}
+
+/**
+ * gtk_string_filter_new:
+ *
+ * Creates a new string filter.
+ *
+ * You will want to set up the filter by providing a string to search for
+ * and by providing a property to look up on the item.
+ *
+ * Returns: a new #GtkStringFilter
+ **/
+GtkFilter *
+gtk_string_filter_new (void)
+{
+  return g_object_new (GTK_TYPE_STRING_FILTER, NULL);
+}
+
+/**
+ * gtk_string_filter_get_search:
+ * @self: a #GtkStringFilter
+ *
+ * Gets the search string set via gtk_string_filter_set_search().
+ *
+ * Returns: (allow-none) (transfer none): The search string
+ **/
+const char *
+gtk_string_filter_get_search (GtkStringFilter *self)
+{
+  g_return_val_if_fail (GTK_IS_STRING_FILTER (self), NULL);
+
+  return self->search;
+}
+
+/**
+ * gtk_string_filter_set_search:
+ * @self: a #GtkStringFilter
+ * @search: (transfer none) (nullable): The string to search for
+ *     or %NULL to clear the search
+ *
+ * Sets the string to search for.
+ **/
+void
+gtk_string_filter_set_search (GtkStringFilter *self,
+                              const char      *search)
+{
+  GtkFilterChange change;
+
+  g_return_if_fail (GTK_IS_STRING_FILTER (self));
+
+  if (g_strcmp0 (self->search, search) == 0)
+    return;
+
+  if (search == NULL || search[0] == 0)
+    change = GTK_FILTER_CHANGE_MATCH_ALL;
+  else if (self->search == NULL)
+    change = GTK_FILTER_CHANGE_MORE_STRICT;
+  else if (g_str_has_prefix (search, self->search))
+    change = GTK_FILTER_CHANGE_MORE_STRICT;
+  else if (g_str_has_prefix (self->search, search))
+    change = GTK_FILTER_CHANGE_LESS_STRICT;
+  else
+    change = GTK_FILTER_CHANGE_DIFFERENT;
+
+  g_free (self->search);
+  g_free (self->search_prepared);
+
+  self->search = g_strdup (search);
+  self->search_prepared = gtk_string_filter_prepare (self, search);
+
+  gtk_filter_changed (GTK_FILTER (self), change);
+
+  g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_SEARCH]);
+}
+
+GtkExpression *
+gtk_string_filter_get_expression (GtkStringFilter *self)
+{
+  g_return_val_if_fail (GTK_IS_STRING_FILTER (self), NULL);
+
+  return self->expression;
+}
+
+void
+gtk_string_filter_set_expression (GtkStringFilter *self,
+                                  GtkExpression   *expression)
+{
+  g_return_if_fail (GTK_IS_STRING_FILTER (self));
+  if (expression)
+    {
+      g_return_if_fail (gtk_expression_get_value_type (expression) == G_TYPE_STRING);
+    }
+
+  if (self->expression == expression)
+    return;
+
+  g_clear_pointer (&self->expression, gtk_expression_unref);
+  self->expression = gtk_expression_ref (expression);
+
+  if (self->search)
+    gtk_filter_changed (GTK_FILTER (self), GTK_FILTER_CHANGE_DIFFERENT);
+
+  g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_EXPRESSION]);
+}
+
+gboolean
+gtk_string_filter_get_ignore_case (GtkStringFilter *self)
+{
+  g_return_val_if_fail (GTK_IS_STRING_FILTER (self), TRUE);
+
+  return self->ignore_case;
+}
+
+void
+gtk_string_filter_set_ignore_case (GtkStringFilter *self,
+                                   gboolean         ignore_case)
+{
+  g_return_if_fail (GTK_IS_STRING_FILTER (self));
+
+  if (self->ignore_case == ignore_case)
+    return;
+
+  self->ignore_case = ignore_case;
+
+  if (self->search)
+    {
+      g_free (self->search_prepared);
+      self->search_prepared = gtk_string_filter_prepare (self, self->search);
+      gtk_filter_changed (GTK_FILTER (self), ignore_case ? GTK_FILTER_CHANGE_LESS_STRICT : 
GTK_FILTER_CHANGE_MORE_STRICT);
+    }
+
+  g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_IGNORE_CASE]);
+}
+
+GtkStringFilterMatchMode
+gtk_string_filter_get_match_mode (GtkStringFilter *self)
+{
+  g_return_val_if_fail (GTK_IS_STRING_FILTER (self), GTK_STRING_FILTER_MATCH_MODE_EXACT);
+
+  return self->match_mode;
+}
+
+
+void
+gtk_string_filter_set_match_mode (GtkStringFilter *self,
+                                  GtkStringFilterMatchMode mode)
+{
+  GtkStringFilterMatchMode old_mode;
+
+  g_return_if_fail (GTK_IS_STRING_FILTER (self));
+
+  if (self->match_mode == mode)
+    return;
+
+  old_mode = self->match_mode;
+  self->match_mode = mode;
+
+  if (self->search && self->expression)
+    {
+      switch (old_mode)
+        {
+        case GTK_STRING_FILTER_MATCH_MODE_EXACT:
+          gtk_filter_changed (GTK_FILTER (self), GTK_FILTER_CHANGE_LESS_STRICT);
+          break;
+
+        case GTK_STRING_FILTER_MATCH_MODE_SUBSTRING:
+          gtk_filter_changed (GTK_FILTER (self), GTK_FILTER_CHANGE_MORE_STRICT);
+          break;
+
+        case GTK_STRING_FILTER_MATCH_MODE_PREFIX:
+          if (mode == GTK_STRING_FILTER_MATCH_MODE_SUBSTRING)
+            gtk_filter_changed (GTK_FILTER (self), GTK_FILTER_CHANGE_LESS_STRICT);
+          else
+            gtk_filter_changed (GTK_FILTER (self), GTK_FILTER_CHANGE_MORE_STRICT);
+          break;
+
+        default:
+          g_assert_not_reached ();
+          break;
+        }
+    }
+
+  g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_MATCH_MODE]);
+}
+
+                                                                 
diff --git a/gtk/gtkstringfilter.h b/gtk/gtkstringfilter.h
new file mode 100644
index 0000000000..2c5e866bac
--- /dev/null
+++ b/gtk/gtkstringfilter.h
@@ -0,0 +1,81 @@
+/*
+ * Copyright © 2019 Benjamin Otte
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors: Benjamin Otte <otte gnome org>
+ */
+
+#ifndef __GTK_STRING_FILTER_H__
+#define __GTK_STRING_FILTER_H__
+
+#if !defined (__GTK_H_INSIDE__) && !defined (GTK_COMPILATION)
+#error "Only <gtk/gtk.h> can be included directly."
+#endif
+
+#include <gtk/gtkexpression.h>
+#include <gtk/gtkfilter.h>
+
+G_BEGIN_DECLS
+
+/**
+ * GtkStringFilterMatchMode:
+ * @GTK_STRING_FILTER_MATCH_MODE_EXACT: The search string and
+ *     text must match exactly.
+ * @GTK_STRING_FILTER_MATCH_MODE_SUBSTRING: The search string
+ *     must be contained as a substring inside the text.
+ * @GTK_STRING_FILTER_MATCH_MODE_PREFIX: The text must begin
+ *     with the search string.
+ *
+ * Specifies how search strings are matched inside text.
+ */
+typedef enum {
+  GTK_STRING_FILTER_MATCH_MODE_EXACT,
+  GTK_STRING_FILTER_MATCH_MODE_SUBSTRING,
+  GTK_STRING_FILTER_MATCH_MODE_PREFIX
+} GtkStringFilterMatchMode;
+
+#define GTK_TYPE_STRING_FILTER             (gtk_string_filter_get_type ())
+GDK_AVAILABLE_IN_ALL
+G_DECLARE_FINAL_TYPE (GtkStringFilter, gtk_string_filter, GTK, STRING_FILTER, GtkFilter)
+
+GDK_AVAILABLE_IN_ALL
+GtkFilter *             gtk_string_filter_new                   (void);
+
+GDK_AVAILABLE_IN_ALL
+const char *            gtk_string_filter_get_search            (GtkStringFilter        *self);
+GDK_AVAILABLE_IN_ALL
+void                    gtk_string_filter_set_search            (GtkStringFilter        *self,
+                                                                 const char             *search);
+GDK_AVAILABLE_IN_ALL
+GtkExpression *         gtk_string_filter_get_expression        (GtkStringFilter        *self);
+GDK_AVAILABLE_IN_ALL
+void                    gtk_string_filter_set_expression        (GtkStringFilter        *self,
+                                                                 GtkExpression          *expression);
+GDK_AVAILABLE_IN_ALL
+gboolean                gtk_string_filter_get_ignore_case       (GtkStringFilter        *self);
+GDK_AVAILABLE_IN_ALL
+void                    gtk_string_filter_set_ignore_case       (GtkStringFilter        *self,
+                                                                 gboolean                ignore_case);
+GDK_AVAILABLE_IN_ALL
+GtkStringFilterMatchMode gtk_string_filter_get_match_mode   (GtkStringFilter          *self);
+GDK_AVAILABLE_IN_ALL
+void                     gtk_string_filter_set_match_mode   (GtkStringFilter          *self,
+                                                             GtkStringFilterMatchMode  mode);
+
+
+
+G_END_DECLS
+
+#endif /* __GTK_STRING_FILTER_H__ */
diff --git a/gtk/meson.build b/gtk/meson.build
index 485c5f084c..9a1dba92e7 100644
--- a/gtk/meson.build
+++ b/gtk/meson.build
@@ -368,6 +368,7 @@ gtk_public_sources = files([
   'gtkstacksidebar.c',
   'gtkstackswitcher.c',
   'gtkstatusbar.c',
+  'gtkstringfilter.c',
   'gtkstylecontext.c',
   'gtkstyleprovider.c',
   'gtkswitch.c',
@@ -622,6 +623,7 @@ gtk_public_headers = files([
   'gtkstacksidebar.h',
   'gtkstackswitcher.h',
   'gtkstatusbar.h',
+  'gtkstringfilter.h',
   'gtkstylecontext.h',
   'gtkstyleprovider.h',
   'gtkswitch.h',
diff --git a/testsuite/gtk/filter.c b/testsuite/gtk/filter.c
index af5505e604..8e98f42be5 100644
--- a/testsuite/gtk/filter.c
+++ b/testsuite/gtk/filter.c
@@ -32,6 +32,90 @@ get (GListModel *model,
   return GPOINTER_TO_UINT (g_object_get_qdata (object, number_quark));
 }
 
+static char *
+get_string (gpointer object)
+{
+  return g_strdup_printf ("%u", GPOINTER_TO_UINT (g_object_get_qdata (object, number_quark)));
+}
+
+static void
+append_digit (GString *s,
+              guint    digit)
+{
+  static char *names[10] = { NULL, "one", "two", "three", "four", "five", "six", "seven", "eight", "nine" };
+
+  if (digit == 0)
+    return;
+
+  g_assert (digit < 10);
+
+  if (s->len)
+    g_string_append_c (s, ' ');
+  g_string_append (s, names[digit]);
+}
+
+static void
+append_below_thousand (GString *s,
+                       guint    n)
+{
+  if (n >= 100)
+    {
+      append_digit (s, n / 100);
+      g_string_append (s, " hundred");
+      n %= 100;
+    }
+
+  if (n >= 20)
+    {
+      const char *names[10] = { NULL, NULL, "twenty", "thirty", "fourty", "fifty", "sixty", "seventy", 
"eighty", "ninety" };
+      if (s->len)
+        g_string_append_c (s, ' ');
+      g_string_append (s, names [n / 10]);
+      n %= 10;
+    }
+
+  if (n >= 10)
+    {
+      const char *names[10] = { "ten", "eleven", "twelve", "thirteen", "fourteen",
+                                "fifteen", "sixteen", "seventeen", "eighteen", "nineteen" };
+      if (s->len)
+        g_string_append_c (s, ' ');
+      g_string_append (s, names [n - 10]);
+    }
+  else
+    {
+      append_digit (s, n);
+    }
+}
+
+static char *
+get_spelled_out (gpointer object)
+{
+  guint n = GPOINTER_TO_UINT (g_object_get_qdata (object, number_quark));
+  GString *s;
+
+  g_assert (n < 1000000);
+
+  if (n == 0)
+    return g_strdup ("Zero");
+
+  s = g_string_new (NULL);
+
+  if (n >= 1000)
+    {
+      append_below_thousand (s, n / 1000);
+      g_string_append (s, " thousand");
+      n %= 1000;
+    }
+
+  append_below_thousand (s, n);
+
+  /* Capitalize first letter so we can do case-sensitive matching */
+  s->str[0] = g_ascii_toupper (s->str[0]);
+
+  return g_string_free (s, FALSE);
+}
+
 static char *
 model_to_string (GListModel *model)
 {
@@ -162,6 +246,76 @@ test_any_simple (void)
   g_object_unref (any);
 }
 
+static void
+test_string_simple (void)
+{
+  GtkFilterListModel *model;
+  GtkFilter *filter;
+  GtkExpression *expr;
+
+  expr = gtk_cclosure_expression_new (G_TYPE_STRING,
+                                      NULL,
+                                      0, NULL,
+                                      G_CALLBACK (get_string),
+                                      NULL, NULL);
+
+  filter = gtk_string_filter_new ();
+  gtk_string_filter_set_expression (GTK_STRING_FILTER (filter), expr);
+
+  model = new_model (20, filter);
+  assert_model (model, "1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20");
+
+  gtk_string_filter_set_search (GTK_STRING_FILTER (filter), "1");
+  assert_model (model, "1 10 11 12 13 14 15 16 17 18 19");
+
+  g_object_unref (model);
+  g_object_unref (filter);
+  gtk_expression_unref (expr);
+}
+
+static void
+test_string_properties (void)
+{
+  GtkFilterListModel *model;
+  GtkFilter *filter;
+  GtkExpression *expr;
+
+  expr = gtk_cclosure_expression_new (G_TYPE_STRING,
+                                      NULL,
+                                      0, NULL,
+                                      G_CALLBACK (get_spelled_out),
+                                      NULL, NULL);
+
+  filter = gtk_string_filter_new ();
+  gtk_string_filter_set_expression (GTK_STRING_FILTER (filter), expr);
+
+  model = new_model (1000, filter);
+  gtk_string_filter_set_search (GTK_STRING_FILTER (filter), "thirte");
+  assert_model (model, "13 113 213 313 413 513 613 713 813 913");
+
+  gtk_string_filter_set_search (GTK_STRING_FILTER (filter), "thirteen");
+  assert_model (model, "13 113 213 313 413 513 613 713 813 913");
+
+  gtk_string_filter_set_ignore_case (GTK_STRING_FILTER (filter), FALSE);
+  assert_model (model, "113 213 313 413 513 613 713 813 913");
+
+  gtk_string_filter_set_search (GTK_STRING_FILTER (filter), "Thirteen");
+  assert_model (model, "13");
+
+  gtk_string_filter_set_match_mode (GTK_STRING_FILTER (filter), GTK_STRING_FILTER_MATCH_MODE_EXACT);
+  assert_model (model, "13");
+
+  gtk_string_filter_set_ignore_case (GTK_STRING_FILTER (filter), TRUE);
+  assert_model (model, "13");
+
+  gtk_string_filter_set_match_mode (GTK_STRING_FILTER (filter), GTK_STRING_FILTER_MATCH_MODE_SUBSTRING);
+  assert_model (model, "13 113 213 313 413 513 613 713 813 913");
+
+  g_object_unref (model);
+  g_object_unref (filter);
+  gtk_expression_unref (expr);
+}
+
 int
 main (int argc, char *argv[])
 {
@@ -172,6 +326,8 @@ main (int argc, char *argv[])
 
   g_test_add_func ("/filter/simple", test_simple);
   g_test_add_func ("/filter/any/simple", test_any_simple);
+  g_test_add_func ("/filter/string/simple", test_string_simple);
+  g_test_add_func ("/filter/string/properties", test_string_properties);
 
   return g_test_run ();
 }