Merge commit '7621e2f8dec938cf48181c8b10afc9b01f444e68' into beta

submodules/lottie-ios/Sources/Private/MainThread/NodeRenderSystem/NodeProperties/Protocols/AnyNodeProperty.swift

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+//
+//  AnyNodeProperty.swift
+//  lottie-swift
+//
+//  Created by Brandon Withrow on 1/30/19.
+//
+
+import CoreGraphics
+import Foundation
+
+// MARK: - AnyNodeProperty
+
+/// A property of a node. The node property holds a provider and a container
+protocol AnyNodeProperty {
+
+  /// Returns true if the property needs to recompute its stored value
+  func needsUpdate(frame: CGFloat) -> Bool
+
+  /// Updates the property for the frame
+  func update(frame: CGFloat)
+
+  /// The stored value container for the property
+  var valueContainer: AnyValueContainer { get }
+
+  /// The value provider for the property
+  var valueProvider: AnyValueProvider { get }
+
+  /// The original value provider for the property
+  var originalValueProvider: AnyValueProvider { get }
+
+  /// The Type of the value provider
+  var valueType: Any.Type { get }
+
+  /// Sets the value provider for the property.
+  func setProvider(provider: AnyValueProvider)
+}
+
+extension AnyNodeProperty {
+
+  /// Returns the most recently computed value for the keypath, returns nil if property wasn't found
+  func getValueOfType<T>() -> T? {
+    valueContainer.value as? T
+  }
+
+  /// Returns the most recently computed value for the keypath, returns nil if property wasn't found
+  func getValue() -> Any? {
+    valueContainer.value
+  }
+
+}

submodules/lottie-ios/Sources/Private/MainThread/NodeRenderSystem/NodeProperties/Protocols/AnyValueContainer.swift

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+//
+//  AnyValueContainer.swift
+//  lottie-swift
+//
+//  Created by Brandon Withrow on 1/30/19.
+//
+
+import CoreGraphics
+import Foundation
+
+/// The container for the value of a property.
+protocol AnyValueContainer: AnyObject {
+
+  /// The stored value of the container
+  var value: Any { get }
+
+  /// Notifies the provider that it should update its container
+  func setNeedsUpdate()
+
+  /// When true the container needs to have its value updated by its provider
+  var needsUpdate: Bool { get }
+
+  /// The frame time of the last provided update
+  var lastUpdateFrame: CGFloat { get }
+
+}

submodules/lottie-ios/Sources/Private/MainThread/NodeRenderSystem/NodeProperties/Protocols/KeypathSearchable.swift

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+//
+//  KeypathSettable.swift
+//  lottie-swift
+//
+//  Created by Brandon Withrow on 2/4/19.
+//
+
+import Foundation
+import QuartzCore
+
+/// Protocol that provides keypath search functionality. Returns all node properties associated with a keypath.
+protocol KeypathSearchable {
+
+  /// The name of the Keypath
+  var keypathName: String { get }
+
+  /// A list of properties belonging to the keypath.
+  var keypathProperties: [String: AnyNodeProperty] { get }
+
+  /// Children Keypaths
+  var childKeypaths: [KeypathSearchable] { get }
+
+  var keypathLayer: CALayer? { get }
+}

submodules/lottie-ios/Sources/Private/MainThread/NodeRenderSystem/NodeProperties/Protocols/NodePropertyMap.swift

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+//
+//  NodePropertyMap.swift
+//  lottie-swift
+//
+//  Created by Brandon Withrow on 1/21/19.
+//
+
+import Foundation
+import QuartzCore
+
+// MARK: - NodePropertyMap
+
+protocol NodePropertyMap {
+  var properties: [AnyNodeProperty] { get }
+}
+
+extension NodePropertyMap {
+
+  var childKeypaths: [KeypathSearchable] {
+    []
+  }
+
+  var keypathLayer: CALayer? {
+    nil
+  }
+
+  /// Checks if the node's local contents need to be rebuilt.
+  func needsLocalUpdate(frame: CGFloat) -> Bool {
+    for property in properties {
+      if property.needsUpdate(frame: frame) {
+        return true
+      }
+    }
+    return false
+  }
+
+  /// Rebuilds only the local nodes that have an update for the frame
+  func updateNodeProperties(frame: CGFloat) {
+    properties.forEach { property in
+      property.update(frame: frame)
+    }
+  }
+
+}