petitlyrics

Sources/EeveeSpotify/Dependencies/XMLCoder/Encoder/XMLEncodingStorage.swift

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+// Copyright (c) 2017-2020 Shawn Moore and XMLCoder contributors
+//
+// This software is released under the MIT License.
+// https://opensource.org/licenses/MIT
+//
+//  Created by Shawn Moore on 11/22/17.
+//
+
+import Foundation
+
+// MARK: - Encoding Storage and Containers
+
+struct XMLEncodingStorage {
+    // MARK: Properties
+
+    /// The container stack.
+    private var containers: [Box] = []
+
+    // MARK: - Initialization
+
+    /// Initializes `self` with no containers.
+    init() {}
+
+    // MARK: - Modifying the Stack
+
+    var count: Int {
+        return containers.count
+    }
+
+    var lastContainer: Box? {
+        return containers.last
+    }
+
+    mutating func pushKeyedContainer(_ keyedBox: KeyedBox = KeyedBox()) -> SharedBox<KeyedBox> {
+        let container = SharedBox(keyedBox)
+        containers.append(container)
+        return container
+    }
+
+    mutating func pushChoiceContainer() -> SharedBox<ChoiceBox> {
+        let container = SharedBox(ChoiceBox())
+        containers.append(container)
+        return container
+    }
+
+    mutating func pushUnkeyedContainer() -> SharedBox<UnkeyedBox> {
+        let container = SharedBox(UnkeyedBox())
+        containers.append(container)
+        return container
+    }
+
+    mutating func push(container: Box) {
+        if let keyedBox = container as? KeyedBox {
+            containers.append(SharedBox(keyedBox))
+        } else if let unkeyedBox = container as? UnkeyedBox {
+            containers.append(SharedBox(unkeyedBox))
+        } else {
+            containers.append(container)
+        }
+    }
+
+    mutating func popContainer() -> Box {
+        precondition(!containers.isEmpty, "Empty container stack.")
+        return containers.popLast()!
+    }
+}