Introduce SampleInfoList as List<SampleInfo> to reduce generic nesting. Fix CI warnings.

osu.Game.Rulesets.Osu/Objects/Slider.cs

@@ -45,7 +45,7 @@ namespace osu.Game.Rulesets.Osu.Objects
             set { Curve.Distance = value; }
         }
 
-        public List<List<SampleInfo>> RepeatSamples { get; set; } = new List<List<SampleInfo>>();
+        public List<SampleInfoList> RepeatSamples { get; set; } = new List<SampleInfoList>();
         public int RepeatCount { get; set; } = 1;
 
         private int stackHeight;
@@ -117,12 +117,12 @@ namespace osu.Game.Rulesets.Osu.Objects
                             StackHeight = StackHeight,
                             Scale = Scale,
                             ComboColour = ComboColour,
-                            Samples = Samples.Select(s => new SampleInfo
+                            Samples = new SampleInfoList(Samples.Select(s => new SampleInfo
                             {
                                 Bank = s.Bank,
                                 Name = @"slidertick",
                                 Volume = s.Volume
-                            }).ToList()
+                            }))
                         };
                     }
                 }

osu.Game.Rulesets.Taiko/Beatmaps/TaikoBeatmapConverter.cs

@@ -69,7 +69,7 @@ namespace osu.Game.Rulesets.Taiko.Beatmaps
             var curveData = obj as IHasCurve;
 
             // Old osu! used hit sounding to determine various hit type information
-            List<SampleInfo> samples = obj.Samples;
+            SampleInfoList samples = obj.Samples;
 
             bool strong = samples.Any(s => s.Name == SampleInfo.HIT_FINISH);
 
@@ -103,16 +103,12 @@ namespace osu.Game.Rulesets.Taiko.Beatmaps
 
                 if (tickSpacing > 0 && osuDuration < 2 * speedAdjustedBeatLength)
                 {
-                    List<List<SampleInfo>> allSamples;
+                    List<SampleInfoList> allSamples = curveData != null ? curveData.RepeatSamples : new List<SampleInfoList>(new[] { samples });
-                    if (curveData != null)
-                        allSamples = curveData.RepeatSamples;
-                    else
-                        allSamples = new List<List<SampleInfo>> { samples };
 
                     int i = 0;
                     for (double j = obj.StartTime; j <= obj.StartTime + taikoDuration + tickSpacing / 8; j += tickSpacing)
                     {
-                        List<SampleInfo> currentSamples = allSamples[i];
+                        SampleInfoList currentSamples = allSamples[i];
                         bool isRim = currentSamples.Any(s => s.Name == SampleInfo.HIT_CLAP || s.Name == SampleInfo.HIT_WHISTLE);
                         strong = currentSamples.Any(s => s.Name == SampleInfo.HIT_FINISH);
 

osu.Game.Rulesets.Taiko/Objects/DrumRoll.cs

@@ -82,12 +82,12 @@ namespace osu.Game.Rulesets.Taiko.Objects
                     TickSpacing = tickSpacing,
                     StartTime = t,
                     IsStrong = IsStrong,
-                    Samples = Samples.Select(s => new SampleInfo
+                    Samples = new SampleInfoList(Samples.Select(s => new SampleInfo
                     {
                         Bank = s.Bank,
                         Name = @"slidertick",
                         Volume = s.Volume
-                    }).ToList()
+                    }))
                 });
 
                 first = false;

osu.Game/Audio/SampleInfoList.cs

@@ -0,0 +1,19 @@
+// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using System.Collections.Generic;
+
+namespace osu.Game.Audio
+{
+    public class SampleInfoList : List<SampleInfo>
+    {
+        public SampleInfoList()
+        {
+        }
+
+        public SampleInfoList(IEnumerable<SampleInfo> elements)
+        {
+            AddRange(elements);
+        }
+    }
+}

osu.Game/Rulesets/Objects/HitObject.cs

@@ -29,7 +29,7 @@ namespace osu.Game.Rulesets.Objects
         /// and can be treated as the default samples for the hit object.
         /// </para>
         /// </summary>
-        public List<SampleInfo> Samples = new List<SampleInfo>();
+        public SampleInfoList Samples = new SampleInfoList();
 
         /// <summary>
         /// Applies default values to this HitObject.

osu.Game/Rulesets/Objects/Legacy/Catch/ConvertHitObjectParser.cs

@@ -22,7 +22,7 @@ namespace osu.Game.Rulesets.Objects.Legacy.Catch
             };
         }
 
-        protected override HitObject CreateSlider(Vector2 position, bool newCombo, List<Vector2> controlPoints, double length, CurveType curveType, int repeatCount, List<List<SampleInfo>> repeatSamples)
+        protected override HitObject CreateSlider(Vector2 position, bool newCombo, List<Vector2> controlPoints, double length, CurveType curveType, int repeatCount, List<SampleInfoList> repeatSamples)
         {
             return new ConvertSlider
             {

osu.Game/Rulesets/Objects/Legacy/ConvertHitObjectParser.cs

@@ -123,7 +123,7 @@ namespace osu.Game.Rulesets.Objects.Legacy
                 }
 
                 // Generate the final per-node samples
-                var nodeSamples = new List<List<SampleInfo>>(nodes);
+                var nodeSamples = new List<SampleInfoList>(nodes);
                 for (int i = 0; i <= repeatCount; i++)
                     nodeSamples.Add(convertSoundType(nodeSoundTypes[i], nodeBankInfos[i]));
 
@@ -204,7 +204,7 @@ namespace osu.Game.Rulesets.Objects.Legacy
         /// <param name="repeatCount">The slider repeat count.</param>
         /// <param name="repeatSamples">The samples to be played when the repeat nodes are hit. This includes the head and tail of the slider.</param>
         /// <returns>The hit object.</returns>
-        protected abstract HitObject CreateSlider(Vector2 position, bool newCombo, List<Vector2> controlPoints, double length, CurveType curveType, int repeatCount, List<List<SampleInfo>> repeatSamples);
+        protected abstract HitObject CreateSlider(Vector2 position, bool newCombo, List<Vector2> controlPoints, double length, CurveType curveType, int repeatCount, List<SampleInfoList> repeatSamples);
 
         /// <summary>
         /// Creates a legacy Spinner-type hit object.
@@ -214,9 +214,9 @@ namespace osu.Game.Rulesets.Objects.Legacy
         /// <returns>The hit object.</returns>
         protected abstract HitObject CreateSpinner(Vector2 position, double endTime);
 
-        private List<SampleInfo> convertSoundType(LegacySoundType type, SampleBankInfo bankInfo)
+        private SampleInfoList convertSoundType(LegacySoundType type, SampleBankInfo bankInfo)
         {
-            var soundTypes = new List<SampleInfo>
+            var soundTypes = new SampleInfoList
             {
                 new SampleInfo
                 {

osu.Game/Rulesets/Objects/Legacy/ConvertSlider.cs

@@ -15,7 +15,7 @@ namespace osu.Game.Rulesets.Objects.Legacy
         public CurveType CurveType { get; set; }
         public double Distance { get; set; }
 
-        public List<List<SampleInfo>> RepeatSamples { get; set; }
+        public List<SampleInfoList> RepeatSamples { get; set; }
         public int RepeatCount { get; set; } = 1;
 
         public double EndTime { get; set; }

osu.Game/Rulesets/Objects/Legacy/Mania/ConvertHitObjectParser.cs

@@ -22,7 +22,7 @@ namespace osu.Game.Rulesets.Objects.Legacy.Mania
             };
         }
 
-        protected override HitObject CreateSlider(Vector2 position, bool newCombo, List<Vector2> controlPoints, double length, CurveType curveType, int repeatCount, List<List<SampleInfo>> repeatSamples)
+        protected override HitObject CreateSlider(Vector2 position, bool newCombo, List<Vector2> controlPoints, double length, CurveType curveType, int repeatCount, List<SampleInfoList> repeatSamples)
         {
             return new ConvertSlider
             {

osu.Game/Rulesets/Objects/Legacy/Osu/ConvertHitObjectParser.cs

@@ -22,7 +22,7 @@ namespace osu.Game.Rulesets.Objects.Legacy.Osu
             };
         }
 
-        protected override HitObject CreateSlider(Vector2 position, bool newCombo, List<Vector2> controlPoints, double length, CurveType curveType, int repeatCount, List<List<SampleInfo>> repeatSamples)
+        protected override HitObject CreateSlider(Vector2 position, bool newCombo, List<Vector2> controlPoints, double length, CurveType curveType, int repeatCount, List<SampleInfoList> repeatSamples)
         {
             return new ConvertSlider
             {

osu.Game/Rulesets/Objects/Legacy/Taiko/ConvertHitObjectParser.cs

@@ -21,7 +21,7 @@ namespace osu.Game.Rulesets.Objects.Legacy.Taiko
             };
         }
 
-        protected override HitObject CreateSlider(Vector2 position, bool newCombo, List<Vector2> controlPoints, double length, CurveType curveType, int repeatCount, List<List<SampleInfo>> repeatSamples)
+        protected override HitObject CreateSlider(Vector2 position, bool newCombo, List<Vector2> controlPoints, double length, CurveType curveType, int repeatCount, List<SampleInfoList> repeatSamples)
         {
             return new ConvertSlider
             {

osu.Game/Rulesets/Objects/Types/IHasRepeats.cs

@@ -19,6 +19,6 @@ namespace osu.Game.Rulesets.Objects.Types
         /// <summary>
         /// The samples to be played when each repeat node is hit (0 -> first repeat node, 1 -> second repeat node, etc).
         /// </summary>
-        List<List<SampleInfo>> RepeatSamples { get; }
+        List<SampleInfoList> RepeatSamples { get; }
     }
 }

osu.Game/osu.Game.csproj

@@ -71,6 +71,7 @@
   </ItemGroup>
   <ItemGroup>
     <Compile Include="Audio\SampleInfo.cs" />
+    <Compile Include="Audio\SampleInfoList.cs" />
     <Compile Include="Beatmaps\Drawables\BeatmapBackgroundSprite.cs" />
     <Compile Include="Beatmaps\DifficultyCalculator.cs" />
     <Compile Include="Online\API\Requests\PostMessageRequest.cs" />