Add check/issue classes

osu.Game/Rulesets/Edit/Checker.cs

@@ -0,0 +1,25 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Collections.Generic;
+using System.Linq;
+using osu.Game.Beatmaps;
+using osu.Game.Checks;
+using osu.Game.Screens.Edit.Verify.Components;
+
+namespace osu.Game.Rulesets.Edit
+{
+    public abstract class Checker
+    {
+        // These are all mode-invariant, hence here instead of in e.g. `OsuChecker`.
+        private readonly List<BeatmapCheck> beatmapChecks = new List<BeatmapCheck>
+        {
+            new CheckMetadataVowels()
+        };
+
+        public virtual IEnumerable<Issue> Run(IBeatmap beatmap)
+        {
+            return beatmapChecks.SelectMany(check => check.Run(beatmap));
+        }
+    }
+}