updated to swift 5.2

Source/animation/AnimationProducer.swift

@@ -269,7 +269,6 @@ class AnimationProducer {
         }
 
         let currentDate = Date()
-        var animationsToRemove = [Animation]()
         let count = contentsAnimations.count
         for (index, animationDesc) in contentsAnimations.reversed().enumerated() {
 

Source/animation/types/animation_generators/CombinationAnimationGenerator.swift

@@ -116,12 +116,12 @@ extension AnimationProducer {
     func addCombineAnimation(_ combineAnimation: Animation, _ context: AnimationContext) {
         guard let combine = combineAnimation as? CombineAnimation,
             let renderer = combine.nodeRenderer,
-            let view = renderer.view else {
+            let _ = renderer.view else {
                 return
         }
 
         var animations = combine.animations
-        if let fromBounds = combine.node?.bounds, let toBounds = combine.toNodes.group().bounds {
+        if let _ = combine.node?.bounds, let _ = combine.toNodes.group().bounds {
             let childAnimations = createChildAnimations(combine) as! [BasicAnimation]
             animations.append(contentsOf: childAnimations)
         }

Source/model/draw/Color.swift

@@ -190,7 +190,10 @@ open class Color: Fill {
         return rgbt( r: r, g: g, b: b, t: 0 )
     }
 
-    override func equals<T>(other: T) -> Bool where T: Color {
+    override func equals<T>(other: T) -> Bool where T: Fill {
+        guard let other = other as? Color else {
+            return false
+        }
         return val == other.val
     }
 }

Source/model/draw/Gradient.swift

@@ -8,17 +8,15 @@ open class Gradient: Fill {
         self.stops = stops
     }
 
-    override func equals<T>(other: T) -> Bool where T: Gradient {
-        if userSpace == other.userSpace {
-
-            if stops.isEmpty && other.stops.isEmpty {
-                return true
-            }
-
-            return stops.elementsEqual(other.stops)
-
-        } else {
+    override func equals<T>(other: T) -> Bool where T: Fill {
+        guard let other = other as? Gradient, userSpace == other.userSpace else {
             return false
         }
+
+        if stops.isEmpty && other.stops.isEmpty {
+            return true
+        }
+
+        return stops.elementsEqual(other.stops)
     }
 }

Source/model/draw/LinearGradient.swift

@@ -52,7 +52,10 @@ open class LinearGradient: Gradient {
         )
     }
 
-    override func equals<T>(other: T) -> Bool where T: LinearGradient {
+    override func equals<T>(other: T) -> Bool where T: Fill {
+        guard let other = other as? LinearGradient else {
+            return false
+        }
         return super.equals(other: other) && x1 == other.x1 && x2 == other.x2 && y1 == other.y1 && y2 == other.y2
     }
 }

Source/model/draw/RadialGradient.swift

@@ -18,7 +18,15 @@ open class RadialGradient: Gradient {
         )
     }
 
-    override func equals<T>(other: T) -> Bool where T: RadialGradient {
-        return super.equals(other: other) && cx == other.cx && cy == other.cy && fx == other.fx && fy == other.fy && r == other.r
+    override func equals<T>(other: T) -> Bool where T: Fill {
+        guard let other = other as? RadialGradient else {
+            return false
+        }
+        let cxEquals = cx == other.cx
+        let cyEquals = cy == other.cy
+        let fxEquals = fx == other.fx
+        let fyEquals = fy == other.fy
+        let rEquals = r == other.r
+        return super.equals(other: other) && cxEquals && cyEquals && fxEquals && fyEquals && rEquals
     }
 }

Source/svg/SVGParser.swift

@@ -465,7 +465,7 @@ open class SVGParser {
         if let units = element.allAttributes["patternContentUnits"]?.text, units == "objectBoundingBox" {
             contentUserSpace = false
         }
-        
+
         var contentNode: Node?
         if pattern.children.isEmpty {
             if let parentPattern = parentPattern {
@@ -483,7 +483,7 @@ open class SVGParser {
             }
             contentNode = Group(contents: shapes)
         }
-        
+
         return UserSpacePattern(content: contentNode!,
                                 bounds: bounds,
                                 userSpace: userSpace,
@@ -1599,7 +1599,7 @@ open class SVGParser {
         guard let element = stop.element else {
             return .none
         }
-        
+
         var offset: Double = 0 // This is default value, value can be omitted
         if let parsedOffset = getDoubleValueFromPercentage(element, attribute: "offset") {
             offset = parsedOffset

Source/views/MacawView.swift

@@ -101,12 +101,12 @@ open class MacawView: MView, MGestureRecognizerDelegate {
     #if os(OSX)
     open override var layer: CALayer? {
         didSet {
-            guard self.layer != nil else {
-                return
-            }
-            initializeView()
+        guard self.layer != nil else {
+        return
+        }
+        initializeView()
 
-            self.renderer = RenderUtils.createNodeRenderer(node, view: self)
+        self.renderer = RenderUtils.createNodeRenderer(node, view: self)
         }
     }
     #endif