petitlyrics

Sources/EeveeSpotify/Dependencies/XMLCoder/Decoder/XMLDecodingStorage.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 11/20/17.
+//
+
+import Foundation
+
+// MARK: - Decoding Storage
+
+struct XMLDecodingStorage {
+    // MARK: Properties
+
+    /// The container stack.
+    /// Elements may be any one of the XML types (StringBox, KeyedBox).
+    private var containers: [Box] = []
+
+    // MARK: - Initialization
+
+    /// Initializes `self` with no containers.
+    init() {}
+
+    // MARK: - Modifying the Stack
+
+    var count: Int {
+        return containers.count
+    }
+
+    func topContainer() -> Box? {
+        return containers.last
+    }
+
+    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)
+        }
+    }
+
+    @discardableResult
+    mutating func popContainer() -> Box? {
+        guard !containers.isEmpty else {
+            return nil
+        }
+        return containers.removeLast()
+    }
+}