Initial implementation of APKINDEX, fetching, reading, parsing, & merging

Sources/apk/Index/ApkIndex.swift

@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: Apache-2.0
+
+struct ApkIndex {
+  let packages: [ApkIndexPackage]
+}
+
+extension ApkIndex {
+  func first(name: String) -> ApkIndexPackage? {
+    self.packages.first {
+      $0.name == name
+    }
+  }
+}
+
+extension ApkIndex {
+  static func merge<S: Sequence>(_ tables: S) -> Self where S.Element == Self {
+    Self.init(packages: tables.flatMap(\.packages))
+  }
+
+  static func merge(_ tables: Self...) -> ApkIndex {
+    Self.init(packages: tables.flatMap(\.packages))
+  }
+}
+
+extension ApkIndex {
+  init(raw: ApkRawIndex) throws {
+    self.packages = try raw.packages.map {
+      try ApkIndexPackage(raw: $0)
+    }
+  }
+}