[PackageModel] Use PolymorphicCodable for Target

Author: aciidgh

Sources/PackageModel/Package.swift

@@ -55,7 +55,8 @@ public final class Package: Codable {
     }
 
     /// The targets contained in the package.
-    public let targets: [Target]
+    @PolymorphicCodableArray
+    public var targets: [Target]
 
     /// The products produced by the package.
     public let products: [Product]
@@ -80,7 +81,7 @@ public final class Package: Codable {
     ) {
         self.manifest = manifest
         self.path = path
-        self.targets = targets
+        self._targets = .init(wrappedValue: targets)
         self.products = products
         self.targetSearchPath = targetSearchPath
         self.testTargetSearchPath = testTargetSearchPath

Sources/PackageModel/Product.swift

@@ -9,6 +9,7 @@
 */
 
 import TSCBasic
+import TSCUtility
 
 /// The type of product.
 public enum ProductType: CustomStringConvertible, Equatable {
@@ -66,7 +67,8 @@ public class Product: Codable {
     ///
     /// This is never empty, and is only the targets which are required to be in
     /// the product, but not necessarily their transitive dependencies.
-    public let targets: [Target]
+    @PolymorphicCodableArray
+    public var targets: [Target]
 
     /// The path to linux main file.
     public let linuxMain: AbsolutePath?
@@ -85,7 +87,7 @@ public class Product: Codable {
         }
         self.name = name
         self.type = type
-        self.targets = targets
+        self._targets = .init(wrappedValue: targets)
         self.linuxMain = linuxMain 
     }
 }

Sources/PackageModel/Target.swift

@@ -9,8 +9,16 @@
 */
 
 import TSCBasic
+import TSCUtility
+
+public class Target: ObjectIdentifierProtocol, PolymorphicCodableProtocol {
+    public static var implementations: [PolymorphicCodableProtocol.Type] = [
+        SwiftTarget.self,
+        ClangTarget.self,
+        SystemLibraryTarget.self,
+        BinaryTarget.self,
+    ]
 
-public class Target: ObjectIdentifierProtocol, Codable {
     /// The target kind.
     public enum Kind: String, Codable {
         case executable

swift-tools-support-core/Sources/TSCUtility/CMakeLists.txt

@@ -25,6 +25,7 @@ add_library(TSCUtility
   OSLog.swift
   PkgConfig.swift
   Platform.swift
+  PolymorphicCodable.swift
   ProgressAnimation.swift
   SimplePersistence.swift
   StringExtensions.swift