[gnome-games] utils: Add the Uri class

[Adrien Plazas <aplazas src gnome org>]

commit 1dee7c3474e467a9eb2f69608ca8ee2009ce57f8
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Sat May 6 07:22:02 2017 +0200

    utils: Add the Uri class
    
    This allows to handle URIs more easily, avoids some useless string
    copies and makes the type checking stronger.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=781334

 src/Makefile.am          |    2 ++
 src/utils/uri-error.vala |    5 +++++
 src/utils/uri.vala       |   43 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 50 insertions(+), 0 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index ba97b4a..543e1fb 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -151,6 +151,8 @@ gnome_games_SOURCES = \
        utils/grep.vala \
        utils/local-cover.vala \
        utils/string-input-stream.vala \
+       utils/uri.vala \
+       utils/uri-error.vala \
        utils/xml-doc.vala \
        \
        config.vala \
diff --git a/src/utils/uri-error.vala b/src/utils/uri-error.vala
new file mode 100644
index 0000000..d78bab6
--- /dev/null
+++ b/src/utils/uri-error.vala
@@ -0,0 +1,5 @@
+// This file is part of GNOME Games. License: GPL-3.0+.
+
+private errordomain Games.UriError {
+       INVALID_SCHEME,
+}
diff --git a/src/utils/uri.vala b/src/utils/uri.vala
new file mode 100644
index 0000000..818ebff
--- /dev/null
+++ b/src/utils/uri.vala
@@ -0,0 +1,43 @@
+// This file is part of GNOME Games. License: GPL-3.0+.
+
+public class Games.Uri {
+       private static Regex scheme_regex;
+
+       private string uri;
+
+       public Uri (string uri) {
+               this.uri = uri;
+       }
+
+       public Uri.from_file (File file) {
+               uri = file.get_uri ();
+       }
+
+       static construct {
+               scheme_regex = /^([a-z][a-z0-9\+\.\-]*):/i;
+       }
+
+       public static uint hash (Uri uri) {
+               return str_hash (uri.uri);
+       }
+
+       public static bool equal (Uri a, Uri b) {
+               return str_equal (a.uri, b.uri);
+       }
+
+       public string to_string () {
+               return uri;
+       }
+
+       public File to_file () {
+               return File.new_for_uri (uri);
+       }
+
+       public string get_scheme () throws Error {
+               MatchInfo info;
+               if (!scheme_regex.match (uri, 0, out info))
+                       throw new UriError.INVALID_SCHEME ("The URI doesn't have a valid scheme: %s.", uri);
+
+               return info.fetch (1);
+       }
+}