Added ProjectFormat enum with specific for each version fields

Author: anivaros

Sources/XcodeGenKit/PBXProjGenerator.swift

@@ -102,7 +102,7 @@ public class PBXProjGenerator {
                 name: project.name,
                 buildConfigurationList: buildConfigList,
                 compatibilityVersion: project.compatibilityVersion,
-                preferredProjectObjectVersion: Int(project.objectVersion),
+                preferredProjectObjectVersion: project.preferredProjectObjectVersion.map { Int($0) },
                 minimizedProjectReferenceProxies: project.minimizedProjectReferenceProxies,
                 mainGroup: mainGroup,
                 developmentRegion: developmentRegion

Sources/XcodeGenKit/ProjectFormat.swift

@@ -0,0 +1,37 @@
+public extension ProjectFormat {
+    static let `default`: ProjectFormat = .xcode16_0
+}
+
+public enum ProjectFormat {
+    case xcode16_3
+    case xcode16_0
+    case xcode15_3
+    case xcode15_0
+    case xcode14_0
+
+    public var objectVersion: UInt {
+        switch self {
+        case .xcode16_3: 90
+        case .xcode16_0: 77
+        case .xcode15_3: 63
+        case .xcode15_0: 60
+        case .xcode14_0: 56
+        }
+    }
+
+    public var preferredProjectObjectVersion: UInt? {
+        switch self {
+        case .xcode16_3, .xcode16_0: objectVersion
+        case .xcode15_3, .xcode15_0, .xcode14_0: nil
+        }
+    }
+
+    public var compatibilityVersion: String? {
+        switch self {
+        case .xcode16_3, .xcode16_0: nil
+        case .xcode15_3: "Xcode 15.3"
+        case .xcode15_0: "Xcode 15.0"
+        case .xcode14_0: "Xcode 14.0"
+        }
+    }
+}

Sources/XcodeGenKit/Version.swift

@@ -11,12 +11,16 @@ extension Project {
         "1.7"
     }
 
-    var compatibilityVersion: String {
-        "Xcode 14.0"
+    var compatibilityVersion: String? {
+        ProjectFormat.default.compatibilityVersion
     }
 
     var objectVersion: UInt {
-        77
+        ProjectFormat.default.objectVersion
+    }
+
+    var preferredProjectObjectVersion: UInt? {
+        ProjectFormat.default.preferredProjectObjectVersion
     }
 
     var minimizedProjectReferenceProxies: Int {