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[gtk/wip/otte/listview: 897/1040] Add GtkStringSorter

commit 1e01caf16136741adef6964b2e7f141aef0f96c6
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Dec 2 23:43:14 2019 -0500

    Add GtkStringSorter
    
    This is a GtkSorter implementation collating strings

 docs/reference/gtk/gtk4-docs.xml     |   1 +
 docs/reference/gtk/gtk4-sections.txt |  19 ++
 docs/reference/gtk/gtk4.types.in     |   1 +
 gtk/gtk.h                            |   1 +
 gtk/gtkstringsorter.c                | 351 +++++++++++++++++++++++++++++++++++
 gtk/gtkstringsorter.h                |  52 ++++++
 gtk/meson.build                      |   2 +
 7 files changed, 427 insertions(+)
---
diff --git a/docs/reference/gtk/gtk4-docs.xml b/docs/reference/gtk/gtk4-docs.xml
index b2728fe0c9..ed057fe19e 100644
--- a/docs/reference/gtk/gtk4-docs.xml
+++ b/docs/reference/gtk/gtk4-docs.xml
@@ -59,6 +59,7 @@
       <section>
         <xi:include href="xml/gtksorter.xml" />
         <xi:include href="xml/gtkcustomsorter.xml" />
+        <xi:include href="xml/gtkstringsorter.xml" />
       </section>
       <xi:include href="xml/gtkselectionmodel.xml" />
       <xi:include href="xml/gtknoselection.xml" />
diff --git a/docs/reference/gtk/gtk4-sections.txt b/docs/reference/gtk/gtk4-sections.txt
index 18eda27023..ebfea3cb36 100644
--- a/docs/reference/gtk/gtk4-sections.txt
+++ b/docs/reference/gtk/gtk4-sections.txt
@@ -2577,6 +2577,25 @@ GTK_SORTER_GET_CLASS
 gtk_sorter_get_type
 </SECTION>
 
+<SECTION>
+<FILE>gtkstringsorter</FILE>
+<TITLE>GtkStringSorter</TITLE>
+GtkStringSorter
+gtk_string_sorter_new
+gtk_string_sorter_get_expression
+gtk_string_sorter_set_expression
+gtk_string_sorter_get_ignore_case
+gtk_string_sorter_set_ignore_case
+<SUBSECTION Standard>
+GTK_STRING_SORTER
+GTK_IS_STRING_SORTER
+GTK_TYPE_STRING_SORTER
+GTK_IS_STRING_SORTER_CLASS
+GTK_STRING_SORTER_GET_CLASS
+<SUBSECTION Private>
+gtk_string_sorter_get_type
+</SECTION>
+
 <SECTION>
 <FILE>gtkcustomsorter</FILE>
 <TITLE>GtkCustomSorter</TITLE>
diff --git a/docs/reference/gtk/gtk4.types.in b/docs/reference/gtk/gtk4.types.in
index 5b6dcd39ae..ccf155c50b 100644
--- a/docs/reference/gtk/gtk4.types.in
+++ b/docs/reference/gtk/gtk4.types.in
@@ -192,6 +192,7 @@ gtk_stack_sidebar_get_type
 gtk_stack_switcher_get_type
 gtk_statusbar_get_type
 gtk_string_filter_get_type
+gtk_string_sorter_get_type
 gtk_switch_get_type
 gtk_level_bar_get_type
 gtk_style_context_get_type
diff --git a/gtk/gtk.h b/gtk/gtk.h
index c2e31a0f7c..258cb84c85 100644
--- a/gtk/gtk.h
+++ b/gtk/gtk.h
@@ -224,6 +224,7 @@
 #include <gtk/gtkstackswitcher.h>
 #include <gtk/gtkstatusbar.h>
 #include <gtk/gtkstringfilter.h>
+#include <gtk/gtkstringsorter.h>
 #include <gtk/gtkstylecontext.h>
 #include <gtk/gtkstyleprovider.h>
 #include <gtk/gtkswitch.h>
diff --git a/gtk/gtkstringsorter.c b/gtk/gtkstringsorter.c
new file mode 100644
index 0000000000..6f30e9bfbc
--- /dev/null
+++ b/gtk/gtkstringsorter.c
@@ -0,0 +1,351 @@
+/*
+ * Copyright © 2019 Matthias Clasen
+ *
+ * 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: Matthias Clasen <mclasen redhat com>
+ */
+
+#include "config.h"
+
+#include "gtkstringsorter.h"
+
+#include "gtkintl.h"
+#include "gtktypebuiltins.h"
+
+/**
+ * SECTION:gtkstringsorter
+ * @Title: GtkStringSorter
+ * @Short_description: Sort by comparing strings
+ * @See_also: #GtkExpression
+ *
+ * GtkStringSorter is a #GtkSorter that compares strings. It does the
+ * comparison in a linguistically correct way using the current locale by
+ * normalizing Unicode strings and possibly case-folding them before
+ * performing the comparison.
+ *
+ * To obtain the strings to compare, this sorter evaluates a #GtkExpression.
+ */
+
+struct _GtkStringSorter
+{
+  GtkSorter parent_instance;
+
+  gboolean ignore_case;
+
+  GtkExpression *expression;
+};
+
+enum {
+  PROP_0,
+  PROP_EXPRESSION,
+  PROP_IGNORE_CASE,
+  NUM_PROPERTIES
+};
+
+G_DEFINE_TYPE (GtkStringSorter, gtk_string_sorter, GTK_TYPE_SORTER)
+
+static GParamSpec *properties[NUM_PROPERTIES] = { NULL, };
+
+static GtkOrdering
+gtk_string_sorter_compare (GtkSorter *sorter,
+                           gpointer   item1,
+                           gpointer   item2)
+{
+  GtkStringSorter *self = GTK_STRING_SORTER (sorter);
+  GValue value1 = G_VALUE_INIT;
+  GValue value2 = G_VALUE_INIT;
+  const char *s1, *s2;
+  gboolean res1, res2;
+  GtkOrdering result;
+
+  if (self->expression == NULL)
+    return GTK_ORDERING_EQUAL;
+
+  res1 = gtk_expression_evaluate (self->expression, item1, &value1);
+  res2 = gtk_expression_evaluate (self->expression, item2, &value2);
+
+  /* If items don't evaluate, order them at the end, so they aren't
+   * in the way. */
+  if (!res1)
+    {
+      result = res2 ? GTK_ORDERING_LARGER : GTK_ORDERING_EQUAL;
+      goto out;
+    }
+  else if (!res2)
+    {
+      result = GTK_ORDERING_SMALLER;
+      goto out;
+    }
+
+  s1 = g_value_get_string (&value1);
+  s2 = g_value_get_string (&value2);
+
+  /* If strings are NULL, order them before "". */
+  if (s1 == NULL)
+    {
+      result = s2 == NULL ? GTK_ORDERING_EQUAL : GTK_ORDERING_SMALLER;
+      goto out;
+    }
+  else if (s2 == NULL)
+    {
+      result = GTK_ORDERING_LARGER;
+      goto out;
+    }
+
+  if (self->ignore_case)
+    {
+      char *t1, *t2;
+
+      t1 = g_utf8_casefold (s1, -1);
+      t2 = g_utf8_casefold (s2, -1);
+
+      result = gtk_ordering_from_cmpfunc (g_utf8_collate (t1, t2));
+
+      g_free (t1);
+      g_free (t2);
+    }
+  else
+    result = gtk_ordering_from_cmpfunc (g_utf8_collate (s1, s2));
+
+out:
+  g_value_unset (&value1);
+  g_value_unset (&value2);
+
+  return result;
+}
+
+static GtkSorterOrder
+gtk_string_sorter_get_order (GtkSorter *sorter)
+{
+  GtkStringSorter *self = GTK_STRING_SORTER (sorter);
+
+  if (self->expression == NULL)
+    return GTK_SORTER_ORDER_NONE;
+
+  return GTK_SORTER_ORDER_PARTIAL;
+}
+
+static void
+gtk_string_sorter_set_property (GObject      *object,
+                                guint         prop_id,
+                                const GValue *value,
+                                GParamSpec   *pspec)
+{
+  GtkStringSorter *self = GTK_STRING_SORTER (object);
+
+  switch (prop_id)
+    {
+    case PROP_EXPRESSION:
+      gtk_string_sorter_set_expression (self, g_value_get_boxed (value));
+      break;
+
+    case PROP_IGNORE_CASE:
+      gtk_string_sorter_set_ignore_case (self, g_value_get_boolean (value));
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+    }
+}
+
+static void 
+gtk_string_sorter_get_property (GObject     *object,
+                                guint        prop_id,
+                                GValue      *value,
+                                GParamSpec  *pspec)
+{
+  GtkStringSorter *self = GTK_STRING_SORTER (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;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+    }
+}
+
+static void
+gtk_string_sorter_dispose (GObject *object)
+{
+  GtkStringSorter *self = GTK_STRING_SORTER (object);
+
+  g_clear_pointer (&self->expression, gtk_expression_unref);
+
+  G_OBJECT_CLASS (gtk_string_sorter_parent_class)->dispose (object);
+}
+
+static void
+gtk_string_sorter_class_init (GtkStringSorterClass *class)
+{
+  GtkSorterClass *sorter_class = GTK_SORTER_CLASS (class);
+  GObjectClass *object_class = G_OBJECT_CLASS (class);
+
+  sorter_class->compare = gtk_string_sorter_compare;
+  sorter_class->get_order = gtk_string_sorter_get_order;
+
+  object_class->get_property = gtk_string_sorter_get_property;
+  object_class->set_property = gtk_string_sorter_set_property;
+  object_class->dispose = gtk_string_sorter_dispose;
+
+  /**
+   * GtkStringSorter: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);
+
+  /**
+   * GtkStringSorter: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);
+
+  g_object_class_install_properties (object_class, NUM_PROPERTIES, properties);
+
+}
+
+static void
+gtk_string_sorter_init (GtkStringSorter *self)
+{
+  self->ignore_case = TRUE;
+}
+
+/**
+ * gtk_string_sorter_new:
+ * @expression: (transfer full) (optional): The expression to evaluate
+ *
+ * Creates a new string sorter that compares items using the given
+ * @expression.
+ *
+ * Unless an expression is set on it, this sorter will always
+ * compare items as invalid.
+ *
+ * Returns: a new #GtkSorter
+ */
+GtkSorter *
+gtk_string_sorter_new (GtkExpression *expression)
+{
+  GtkSorter *result;
+
+  result = g_object_new (GTK_TYPE_STRING_SORTER,
+                         "expression", expression,
+                         NULL);
+
+  g_clear_pointer (&expression, gtk_expression_unref);
+
+  return result;
+}
+
+/**
+ * gtk_string_sorter_get_expression:
+ * @self: a #GtkStringSorter
+ *
+ * Gets the expression that is evaluated to obtain strings from items.
+ *
+ * Returns: (nullable): a #GtkExpression, or %NULL
+ */
+GtkExpression *
+gtk_string_sorter_get_expression (GtkStringSorter *self)
+{
+  g_return_val_if_fail (GTK_IS_STRING_SORTER (self), NULL);
+
+  return self->expression;
+}
+
+/**
+ * gtk_string_sorter_set_expression:
+ * @self: a #GtkStringSorter
+ * @expression: (nullable) (transfer none): a #GtkExpression, or %NULL
+ *
+ * Sets the expression that is evaluated to obtain strings from items.
+ *
+ * The expression must have the type G_TYPE_STRING.
+ */
+void
+gtk_string_sorter_set_expression (GtkStringSorter *self,
+                                  GtkExpression   *expression)
+{
+  g_return_if_fail (GTK_IS_STRING_SORTER (self));
+  g_return_if_fail (expression == NULL || gtk_expression_get_value_type (expression) == G_TYPE_STRING);
+
+  if (self->expression == expression)
+    return;
+
+  g_clear_pointer (&self->expression, gtk_expression_unref);
+  if (expression)
+    self->expression = gtk_expression_ref (expression);
+
+  gtk_sorter_changed (GTK_SORTER (self), GTK_SORTER_CHANGE_DIFFERENT);
+
+  g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_EXPRESSION]);
+}
+
+/**
+ * gtk_string_sorter_get_ignore_case:
+ * @self: a #GtkStringSorter
+ *
+ * Gets whether the sorter ignores case differences.
+ *
+ * Returns: %TRUE if @self is ignoring case differences
+ */
+gboolean
+gtk_string_sorter_get_ignore_case (GtkStringSorter *self)
+{
+  g_return_val_if_fail (GTK_IS_STRING_SORTER (self), TRUE);
+
+  return self->ignore_case;
+}
+
+/**
+ * gtk_string_sorter_set_ignore_case:
+ * @self: a #GtkStringSorter
+ *
+ * Sets whether the sorter will ignore case differences.
+ */
+void
+gtk_string_sorter_set_ignore_case (GtkStringSorter *self,
+                                   gboolean         ignore_case)
+{
+  g_return_if_fail (GTK_IS_STRING_SORTER (self));
+
+  if (self->ignore_case == ignore_case)
+    return;
+
+  self->ignore_case = ignore_case;
+
+  gtk_sorter_changed (GTK_SORTER (self), ignore_case ? GTK_SORTER_CHANGE_LESS_STRICT : 
GTK_SORTER_CHANGE_MORE_STRICT);
+
+  g_object_notify_by_pspec (G_OBJECT (self), properties[PROP_IGNORE_CASE]);
+}
diff --git a/gtk/gtkstringsorter.h b/gtk/gtkstringsorter.h
new file mode 100644
index 0000000000..e7323aacdc
--- /dev/null
+++ b/gtk/gtkstringsorter.h
@@ -0,0 +1,52 @@
+/*
+ * Copyright © 2019 Matthias Clasen
+ *
+ * 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: Matthias Clasen <mclasen redhat com>
+ */
+
+#ifndef __GTK_STRING_SORTER_H__
+#define __GTK_STRING_SORTER_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/gtksorter.h>
+
+G_BEGIN_DECLS
+
+#define GTK_TYPE_STRING_SORTER             (gtk_string_sorter_get_type ())
+GDK_AVAILABLE_IN_ALL
+G_DECLARE_FINAL_TYPE (GtkStringSorter, gtk_string_sorter, GTK, STRING_SORTER, GtkSorter)
+
+GDK_AVAILABLE_IN_ALL
+GtkSorter *             gtk_string_sorter_new                   (GtkExpression          *expression);
+
+GDK_AVAILABLE_IN_ALL
+GtkExpression *         gtk_string_sorter_get_expression        (GtkStringSorter        *self);
+GDK_AVAILABLE_IN_ALL
+void                    gtk_string_sorter_set_expression        (GtkStringSorter        *self,
+                                                                 GtkExpression          *expression);
+GDK_AVAILABLE_IN_ALL
+gboolean                gtk_string_sorter_get_ignore_case       (GtkStringSorter        *self);
+GDK_AVAILABLE_IN_ALL
+void                    gtk_string_sorter_set_ignore_case       (GtkStringSorter        *self,
+                                                                 gboolean                ignore_case);
+
+G_END_DECLS
+
+#endif /* __GTK_STRING_SORTER_H__ */
diff --git a/gtk/meson.build b/gtk/meson.build
index 30199ab1c8..d13982d433 100644
--- a/gtk/meson.build
+++ b/gtk/meson.build
@@ -359,6 +359,7 @@ gtk_public_sources = files([
   'gtkstackswitcher.c',
   'gtkstatusbar.c',
   'gtkstringfilter.c',
+  'gtkstringsorter.c',
   'gtkstylecontext.c',
   'gtkstyleprovider.c',
   'gtkswitch.c',
@@ -608,6 +609,7 @@ gtk_public_headers = files([
   'gtkstackswitcher.h',
   'gtkstatusbar.h',
   'gtkstringfilter.h',
+  'gtkstringsorter.h',
   'gtkstylecontext.h',
   'gtkstyleprovider.h',
   'gtkswitch.h',
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