refactor: ParseTapNote可以拒绝生成note

Author: Starrah

generator/chu/UgcGenerator.cs

@@ -200,12 +200,13 @@ private string Serialize(ChuChart ugc)
                             sb.AppendLine($"#{endTicks}>{SlideFollowerMarker(seg.Type)}");
                     }
                 }
-                continue;
             }
-
-            var durTicks = Utils.Tick(n.Duration, RSL);
-            if (n.Type is "HLD" or "HXD" && durTicks > 0)
-                sb.AppendLine($"#{durTicks}>s");
+            else
+            {
+                var durTicks = Utils.Tick(n.Duration, RSL);
+                if (n.Type is "HLD" or "HXD" && durTicks > 0)
+                    sb.AppendLine($"#{durTicks}>s");
+            }
         }
         return sb.ToString();
     }

parser/chu/UgcParser.cs

@@ -310,10 +310,10 @@ private int ParseNoteLine(string[] lines, int idx, ChuChart chart, List<Alert> a
         switch (typeChar)
         {
             case 't':
-                ParseTapNote(code, note, alerts, lineNum, chart, false);
+                note = ParseTapNote(code, note, alerts, lineNum, chart, false);
                 break;
             case 'x':
-                ParseTapNote(code, note, alerts, lineNum, chart, true);
+                note = ParseTapNote(code, note, alerts, lineNum, chart, true);
                 break;
 
             case 'h':
@@ -367,7 +367,7 @@ private int ParseNoteLine(string[] lines, int idx, ChuChart chart, List<Alert> a
         return idx;
     }
 
-    private void ParseTapNote(string code, ChuNote note, List<Alert> alerts, int lineNum, ChuChart chart, bool isCHR)
+    private ChuNote? ParseTapNote(string code, ChuNote note, List<Alert> alerts, int lineNum, ChuChart chart, bool isCHR)
     {
         note.Type = "TAP";
         ParseCellWidth(code, 1, note, alerts, lineNum, chart);
@@ -377,6 +377,7 @@ private void ParseTapNote(string code, ChuNote note, List<Alert> alerts, int lin
             var extraRaw = code.Length > 3 ? code[3..] : "";
             note.Tag = U2C_ChrExtras.GetValueOrDefault(extraRaw, extraRaw);
         }
+        return note;
     }
 
     private const int CrushInterval_Dollar_Value = 100;