chore: Inverse if-else tree in Timeline

include/core/timeline.h

@@ -15,7 +15,9 @@ template <class TNote,
 class Timeline
 {
   public:
-    explicit Timeline() : _current_offset(0) {}
+    explicit Timeline() : _current_offset(0)
+    {
+    }
 
     typedef typename std::set<TNote *>::const_iterator Iterator;
 
@@ -24,30 +26,30 @@ class Timeline
         _current_offset = offset;
         expire(_top_note);
 
-        if (!_timeline.empty())
+        if (_timeline.empty())
+            return;
+
+        Iterator head_iterator = _timeline.begin();
+
+        while (!isExpired(head_iterator))
         {
-            Iterator head_iterator = _timeline.begin();
-
-            while (!isExpired(head_iterator))
+            if ((*head_iterator)->getPerfectOffset() >= offset)
             {
-                if ((*head_iterator)->getPerfectOffset() >= offset)
-                {
-                    Iterator pre_head = head_iterator;
-                    --pre_head;
+                Iterator pre_head = head_iterator;
+                --pre_head;
 
-                    _top_note =
-                        !isExpired(pre_head) && (*pre_head)->isActive(offset)
-                            ? pre_head
-                            : head_iterator;
-                    break;
-                }
-
-                ++head_iterator;
+                _top_note =
+                    !isExpired(pre_head) && (*pre_head)->isActive(offset)
+                        ? pre_head
+                        : head_iterator;
+                break;
             }
 
-            if (isExpired(_top_note))
-                _top_note = _timeline.begin();
+            ++head_iterator;
         }
+
+        if (isExpired(_top_note))
+            _top_note = _timeline.begin();
     }
 
     void setNotes(const std::set<TNote *, NotePtrComparator> &notes)
@@ -128,11 +130,20 @@ class Timeline
         iterator = _timeline.end();
     }
 
-    inline Iterator getTopNote() const noexcept { return _top_note; }
+    inline Iterator getTopNote() const noexcept
+    {
+        return _top_note;
+    }
 
-    inline Iterator begin() const noexcept { return _timeline.begin(); }
+    inline Iterator begin() const noexcept
+    {
+        return _timeline.begin();
+    }
 
-    inline Iterator end() const noexcept { return _timeline.end(); }
+    inline Iterator end() const noexcept
+    {
+        return _timeline.end();
+    }
 
   private:
     std::set<TNote *, NotePtrComparator> _timeline;