From 519dcb04dc0bbfbaab85ecb45dda390340a5122d Mon Sep 17 00:00:00 2001
From: Richard Hughes <richard@hughsie.com>
Date: Tue, 2 May 2017 09:59:05 +0100
Subject: Casefold all stemmed entries

The idea for the stemmer is to input a string and to return a more generic
version of it. We already casefold the search parameters which means we can
reduce the duplication in the stemmer cache and also match more types of
mixed-case search values.
---
 libappstream-glib/as-self-test.c |  9 ++++++++-
 libappstream-glib/as-stemmer.c   | 16 ++++++++++------
 2 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/libappstream-glib/as-self-test.c b/libappstream-glib/as-self-test.c
index 93935e4..218f4b6 100644
--- a/libappstream-glib/as-self-test.c
+++ b/libappstream-glib/as-self-test.c
@@ -2970,13 +2970,14 @@ as_test_app_search_func (void)
 	const gchar *all[] = { "gnome", "install", "software", NULL };
 	const gchar *none[] = { "gnome", "xxx", "software", NULL };
 	const gchar *mime[] = { "application/vnd.oasis.opendocument.text", NULL };
+	g_auto(GStrv) tokens = NULL;
 	g_autoptr(AsApp) app = NULL;
 	g_autoptr(GHashTable) search_blacklist = NULL;
 	g_autoptr(AsStemmer) stemmer = as_stemmer_new ();
 
 	app = as_app_new ();
 	as_app_set_stemmer (app, stemmer);
-	as_app_set_id (app, "gnome-software");
+	as_app_set_id (app, "org.gnome.Software.desktop");
 	as_app_add_pkgname (app, "gnome-software");
 	as_app_set_name (app, NULL, "GNOME Software X-Plane");
 	as_app_set_comment (app, NULL, "Install and remove software");
@@ -3001,6 +3002,12 @@ as_test_app_search_func (void)
 	g_assert_cmpint (as_app_search_matches_all (app, (gchar**) none), ==, 0);
 	g_assert_cmpint (as_app_search_matches_all (app, (gchar**) mime), ==, 4);
 
+	/* test searching for all tokenized tokens */
+	tokens = as_utils_search_tokenize ("org.gnome.Software");
+	g_assert_cmpstr (tokens[0], ==, "org.gnome.software");
+	g_assert_cmpstr (tokens[1], ==, NULL);
+	g_assert_cmpint (as_app_search_matches_all (app, tokens), ==, 256);
+
 	/* test tokenization of hyphenated name */
 	g_assert_cmpint (as_app_search_matches (app, "x-plane"), ==, 64);
 	g_assert_cmpint (as_app_search_matches (app, "plane"), ==, 64);
diff --git a/libappstream-glib/as-stemmer.c b/libappstream-glib/as-stemmer.c
index ef7ccd6..3a9478d 100644
--- a/libappstream-glib/as-stemmer.c
+++ b/libappstream-glib/as-stemmer.c
@@ -59,6 +59,7 @@ as_stemmer_process (AsStemmer *stemmer, const gchar *value)
 	AsRefString *new;
 	const gchar *tmp;
 	gsize value_len;
+	g_autofree gchar *value_casefold = NULL;
 	g_autoptr(GMutexLocker) locker = g_mutex_locker_new (&stemmer->ctx_mutex);
 
 	/* look for word in the cache */
@@ -67,25 +68,28 @@ as_stemmer_process (AsStemmer *stemmer, const gchar *value)
 		return as_ref_string_ref (new);
 
 	/* not enabled */
+	value_casefold = g_utf8_casefold (value, -1);
 	if (stemmer->ctx == NULL || !stemmer->enabled)
-		return as_ref_string_new (value);
+		return as_ref_string_new (value_casefold);
 
 	/* stem, then add to the cache */
-	value_len = strlen (value);
+	value_len = strlen (value_casefold);
 	tmp = (const gchar *) sb_stemmer_stem (stemmer->ctx,
-					       (guchar *) value,
+					       (guchar *) value_casefold,
 					       (gint) value_len);
 	if (value_len == (gsize) sb_stemmer_length (stemmer->ctx)) {
-		new = as_ref_string_new_with_length (value, value_len);
+		new = as_ref_string_new_with_length (value_casefold, value_len);
 	} else {
 		new = as_ref_string_new_copy (tmp);
 	}
 	g_hash_table_insert (stemmer->hash,
-			     as_ref_string_new (value),
+			     as_ref_string_new (value_casefold),
 			     as_ref_string_ref (new));
 	return new;
 #else
-	return as_ref_string_new (value);
+	g_autofree gchar *value_casefold = NULL;
+	value_casefold = g_utf8_casefold (value, -1);
+	return as_ref_string_new (value_casefold);
 #endif
 }
 
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