⭐️ Impl: RNIWeakRef

Related to: TODO:2023-03-04-15-39-46 - Impl: RNIModalManager

ios/src_library/React Native/RNIWeak/RNIWeakRef.swift

@@ -0,0 +1,66 @@
+//
+//  RNIWeakRef.swift
+//  react-native-ios-modal
+//
+//  Created by Dominic Go on 3/11/23.
+//
+
+import Foundation
+
+
+public class RNIWeakRef<T> {
+  public weak var rawRef: AnyObject?;
+
+  public var synthesizedRef: T? {
+    self.rawRef as? T;
+  };
+
+  init(with ref: AnyObject) {
+    self.rawRef = ref;
+  };
+};
+
+public class RNIWeakDictionary<K: Hashable, T> {
+
+  fileprivate var _dict: [K: RNIWeakRef<T>] = [:];
+
+  var purgedDict: [K: RNIWeakRef<T>] {
+    get {
+      self._dict.compactMapValues {
+        $0.rawRef != nil ? $0 : nil;
+      }
+    }
+  };
+
+  var dict: [K: RNIWeakRef<T>] {
+    get {
+      let purgedDict = self.purgedDict;
+      self._dict = purgedDict;
+
+      return purgedDict;
+    }
+  }
+
+  func set(for key: K, with value: T){
+    self._dict[key] = RNIWeakRef(with: value as AnyObject);
+  };
+
+  func get(for key: K) -> T? {
+    guard let ref = self._dict[key]?.synthesizedRef else {
+      self._dict.removeValue(forKey: key);
+      return nil;
+    };
+
+    return ref;
+  };
+
+  subscript(key: K) -> T? {
+    get {
+      self.get(for: key);
+    }
+    set {
+      guard let ref = newValue else { return };
+      self.set(for: key, with: ref);
+    }
+  }
+};