text: //
  //  LOTAnimatorNode.h
  //  Pods
  //
  //  Created by brandon_withrow on 6/27/17.
  //
  //
  
  #import <Foundation/Foundation.h>
  #import "LOTPlatformCompat.h"
  #import "LOTBezierPath.h"
  #import "LOTKeypath.h"
  #import "LOTValueDelegate.h"
  
  extern NSInteger indentation_level;
  @interface LOTAnimatorNode : NSObject
  
  /// Initializes the node with and optional input node and keyname.
  - (instancetype _Nonnull)initWithInputNode:(LOTAnimatorNode *_Nullable)inputNode
                                      keyName:(NSString *_Nullable)keyname;
  
  /// A dictionary of the value interpolators this node controls
  @property (nonatomic, readonly, strong) NSDictionary * _Nullable valueInterpolators;
  
  /// The keyname of the node. Used for dynamically setting keyframe data.
  @property (nonatomic, readonly, strong) NSString * _Nullable keyname;
  
  /// The current time in frames
  @property (nonatomic, readonly, strong) NSNumber * _Nullable currentFrame;
  /// The upstream animator node
  @property (nonatomic, readonly, strong) LOTAnimatorNode * _Nullable inputNode;
  
  /// This nodes path in local object space
  @property (nonatomic, strong) LOTBezierPath * _Nonnull localPath;
  /// The sum of all paths in the tree including this node
  @property (nonatomic, strong) LOTBezierPath * _Nonnull outputPath;
  
  /// Returns true if this node needs to update its contents for the given frame. To be overwritten by subclasses.
  - (BOOL)needsUpdateForFrame:(NSNumber *_Nonnull)frame;
  
  /// Sets the current frame and performs any updates. Returns true if any updates were performed, locally or upstream.
  - (BOOL)updateWithFrame:(NSNumber *_Nonnull)frame;
  - (BOOL)updateWithFrame:(NSNumber *_Nonnull)frame
        withModifierBlock:(void (^_Nullable)(LOTAnimatorNode * _Nonnull inputNode))modifier
         forceLocalUpdate:(BOOL)forceUpdate;
  
  - (void)forceSetCurrentFrame:(NSNumber *_Nonnull)frame;
  
  @property (nonatomic, assign) BOOL pathShouldCacheLengths;
  /// Update the local content for the frame.
  - (void)performLocalUpdate;
  
  /// Rebuild all outputs for the node. This is called after upstream updates have been performed.
  - (void)rebuildOutputs;
  
  - (void)logString:(NSString *_Nonnull)string;
  
  - (void)searchNodesForKeypath:(LOTKeypath * _Nonnull)keypath;
  
  - (void)setValueDelegate:(id<LOTValueDelegate> _Nonnull)delegate
                forKeypath:(LOTKeypath * _Nonnull)keypath;
  
  @end
  