Add OpenSwiftUIBridge target

Package.swift

@@ -104,6 +104,16 @@ let openSwiftUIExtensionTarget = Target.target(
     ],
     swiftSettings: sharedSwiftSettings
 )
+
+let bridgeFramework = Context.environment["OPENSWIFTUI_BRIDGE_FRAMEWORK"] ?? "SwiftUI"
+let openSwiftUIBridgeTarget = Target.target(
+    name: "OpenSwiftUIBridge",
+    dependencies: [
+        "OpenSwiftUI",
+    ],
+    sources: ["Bridgeable.swift", bridgeFramework],
+    swiftSettings: sharedSwiftSettings
+)
 let OpenSwiftUI_SPITestTarget = Target.testTarget(
     name: "OpenSwiftUI_SPITests",
     dependencies: [
@@ -140,6 +150,15 @@ let openSwiftUICompatibilityTestTarget = Target.testTarget(
     exclude: ["README.md"],
     swiftSettings: sharedSwiftSettings
 )
+let openSwiftUIBridgeTestTarget = Target.testTarget(
+    name: "OpenSwiftUIBridgeTests",
+    dependencies: [
+        "OpenSwiftUIBridge",
+    ],
+    exclude: ["README.md"],
+    sources: ["BridgeableTests.swift", bridgeFramework],
+    swiftSettings: sharedSwiftSettings
+)
 
 let swiftBinPath = Context.environment["_"] ?? "/usr/bin/swift"
 let swiftBinURL = URL(fileURLWithPath: swiftBinPath)
@@ -153,6 +172,7 @@ let package = Package(
         .library(name: "OpenSwiftUI", targets: ["OpenSwiftUI", "OpenSwiftUIExtension"]),
         // FIXME: This will block xcodebuild build(iOS CI) somehow
         // .library(name: "OpenSwiftUI_SPI", targets: ["OpenSwiftUI_SPI"]),
+        // .library(name: "OpenSwiftUIBridge", targets: ["OpenSwiftUIBridge"])
     ],
     dependencies: [
         .package(url: "https://github.com/apple/swift-numerics.git", from: "1.0.2"),
@@ -179,12 +199,15 @@ let package = Package(
         .binaryTarget(name: "CoreServices", path: "PrivateFrameworks/CoreServices.xcframework"),
         openSwiftUICoreTarget,
         openSwiftUITarget,
+
         openSwiftUIExtensionTarget,
+        openSwiftUIBridgeTarget,
 
         OpenSwiftUI_SPITestTarget,
         openSwiftUICoreTestTarget,
         openSwiftUITestTarget,
         openSwiftUICompatibilityTestTarget,
+        openSwiftUIBridgeTestTarget,
     ]
 )
 
@@ -234,6 +257,7 @@ if attributeGraphCondition {
     openSwiftUICoreTestTarget.addAGSettings()
     openSwiftUITestTarget.addAGSettings()
     openSwiftUICompatibilityTestTarget.addAGSettings()
+    openSwiftUIBridgeTestTarget.addAGSettings()
 }
 
 #if os(macOS)

README.md

@@ -79,6 +79,15 @@ for various platforms:
 > So most of the core feature is only available on Apple platform built with
 > AttributeGraph varient.
 
+## Products
+
+- OpenSwiftUI
+    - A SwiftUI source compatibility framework.
+- OpenSwiftUIExtension
+    - Extensive API collections for OpenSwiftUI & SwiftUI.
+- OpenSwiftUIBridge
+    - A bridge layer for migrating other DSL framework to OpenSwiftUI incrementally and mixing them freely.
+
 ## License
 
 See LICENSE file - MIT

Sources/OpenSwiftUIBridge/Bridgeable.swift

@@ -0,0 +1,16 @@
+//
+//  Bridgeable.swift
+//  OpenSwiftUIBridge
+
+import OpenSwiftUI
+
+/// A type that can be converted to and from its counterpart.
+public protocol Bridgeable<Counterpart> {
+    associatedtype Counterpart where Counterpart: Bridgeable, Counterpart.Counterpart == Self
+
+    init(_ counterpart: Counterpart)
+}
+
+extension Bridgeable {
+    public var counterpart: Self.Counterpart { .init(self) }
+}

Sources/OpenSwiftUIBridge/SwiftUI/SwiftUI.Color.swift

@@ -0,0 +1,78 @@
+//
+//  SwiftUI.Color.swift
+//  OpenSwiftUIBridge
+
+#if canImport(SwiftUI)
+public import SwiftUI
+public import OpenSwiftUI
+
+// MARK: Color + Bridgeable
+
+@available(iOS 17.0, macOS 14.0, tvOS 17.0, watchOS 10.0, *)
+extension SwiftUI.Color: Bridgeable {
+    public typealias Counterpart = OpenSwiftUI.Color
+
+    public init(_ counterpart: Counterpart) {
+        self.init(OpenSwiftUIColor2SwiftUIColorAdapter(base: counterpart))
+    }
+}
+
+@available(iOS 17.0, macOS 14.0, tvOS 17.0, watchOS 10.0, *)
+extension OpenSwiftUI.Color: Bridgeable {
+    public typealias Counterpart = SwiftUI.Color
+
+    public init(_ counterpart: Counterpart) {
+        self.init(SwiftUIColor2OpenSwiftUIColorAdapter(base: counterpart))
+    }
+}
+
+@available(iOS 17.0, macOS 14.0, tvOS 17.0, watchOS 10.0, *)
+private struct OpenSwiftUIColor2SwiftUIColorAdapter: Hashable, SwiftUI.ShapeStyle {
+    private let base: OpenSwiftUI.Color
+
+    init(base: OpenSwiftUI.Color) {
+        self.base = base
+    }
+
+    public typealias Resolved = SwiftUI.Color.Resolved
+
+    public func resolve(in environment: SwiftUI.EnvironmentValues) -> SwiftUI.Color.Resolved {
+        .init(base.resolve(in: .init(environment)))
+    }
+}
+
+@available(iOS 17.0, macOS 14.0, tvOS 17.0, watchOS 10.0, *)
+private struct SwiftUIColor2OpenSwiftUIColorAdapter: Hashable, OpenSwiftUI.ShapeStyle {
+    private let base: SwiftUI.Color
+
+    init(base: SwiftUI.Color) {
+        self.base = base
+    }
+
+    public typealias Resolved = OpenSwiftUI.Color.Resolved
+
+    public func resolve(in environment: OpenSwiftUI.EnvironmentValues) -> OpenSwiftUI.Color.Resolved {
+        .init(base.resolve(in: .init(environment)))
+    }
+}
+
+// MARK: - Color.Resolved + Bridgeable
+
+@available(iOS 17.0, macOS 14.0, tvOS 17.0, watchOS 10.0, *)
+extension SwiftUI.Color.Resolved: Bridgeable {
+    public typealias Counterpart = OpenSwiftUI.Color.Resolved
+
+    public init(_ counterpart: Counterpart) {
+        self.init(colorSpace: .sRGBLinear, red: counterpart.linearRed, green: counterpart.linearGreen, blue: counterpart.linearBlue)
+    }
+}
+
+@available(iOS 17.0, macOS 14.0, tvOS 17.0, watchOS 10.0, *)
+extension OpenSwiftUI.Color.Resolved: Bridgeable {
+    public typealias Counterpart = SwiftUI.Color.Resolved
+
+    public init(_ counterpart: Counterpart) {
+        self.init(colorSpace: .sRGBLinear, red: counterpart.linearRed, green: counterpart.linearGreen, blue: counterpart.linearBlue)
+    }
+}
+#endif

Sources/OpenSwiftUIBridge/SwiftUI/SwiftUI.EnvironmentValues.swift

@@ -0,0 +1,28 @@
+//
+//  SwiftUI.EnvironmentValues.swift
+//  OpenSwiftUIBridge
+
+#if canImport(SwiftUI)
+public import SwiftUI
+public import OpenSwiftUI
+
+// MARK: EnvironmentValues + Bridgeable
+
+extension SwiftUI.EnvironmentValues: Bridgeable {
+    public typealias Counterpart = OpenSwiftUI.EnvironmentValues
+
+    public init(_ counterpart: Counterpart) {
+        // FIXME
+        self.init()
+    }
+}
+
+extension OpenSwiftUI.EnvironmentValues: Bridgeable {
+    public typealias Counterpart = SwiftUI.EnvironmentValues
+
+    public init(_ counterpart: Counterpart) {
+        // FIXME
+        self.init()
+    }
+}
+#endif

Tests/OpenSwiftUIBridgeTests/BridgeableTests.swift

@@ -0,0 +1,42 @@
+//
+//  BridgeableTests.swift
+//  OpenSwiftUIBridgeTests
+
+import Testing
+import OpenSwiftUIBridge
+
+struct BridgeableTests {
+    @Test
+    func example() throws {
+        struct A1: Bridgeable, Equatable {
+            typealias Counterpart = A2
+            var value: Int
+
+            init(value: Int) {
+                self.value = value
+            }
+
+            init(_ counterpart: A2) {
+                self.value = counterpart.value
+            }
+        }
+
+        struct A2: Bridgeable, Equatable {
+            typealias Counterpart = A1
+            var value: Int
+
+            init(value: Int) {
+                self.value = value
+            }
+
+            init(_ counterpart: A1) {
+                self.value = counterpart.value
+            }
+        }
+        let a1 = A1(value: 3)
+        let a2 = A2(value: 3)
+
+        #expect(a1.counterpart == a2)
+        #expect(a2.counterpart == a1)
+    }
+}

Tests/OpenSwiftUIBridgeTests/README.md

@@ -0,0 +1,7 @@
+## OpenSwiftUIBridgeTests
+
+Test API of OpenSwiftUIBridge
+
+```swift
+import OpenSwiftUIBridge
+```

Tests/OpenSwiftUIBridgeTests/SwiftUI/SwiftUI.ColorTests.swift

@@ -0,0 +1,31 @@
+//
+//  SwiftUI.ColorTests.swift
+//  OpenSwiftUIBridgeTests
+
+#if canImport(SwiftUI)
+import Testing
+import SwiftUI
+import OpenSwiftUI
+import OpenSwiftUIBridge
+
+struct SwiftUI_ColorTests {
+    @Test
+    @available(iOS 17.0, macOS 14.0, tvOS 17.0, watchOS 10.0, *)
+    func color() throws {
+        let swiftUIWhite = SwiftUI.Color.white
+        let openSwiftUIWhite = OpenSwiftUI.Color.white
+        #expect(swiftUIWhite.counterpart.resolve(in: .init()) == openSwiftUIWhite.resolve(in: .init()))
+        #expect(openSwiftUIWhite.counterpart.resolve(in: .init()) == swiftUIWhite.resolve(in: .init()))
+    }
+
+    @Test
+    @available(iOS 17.0, macOS 14.0, tvOS 17.0, watchOS 10.0, *)
+    func resolved() throws {
+        let swiftUIWhiteResolved = SwiftUI.Color.Resolved.init(red: 1, green: 1, blue: 1)
+        let openSwiftUIWhiteResolved = OpenSwiftUI.Color.Resolved.init(red: 1, green: 1, blue: 1)
+
+        #expect(swiftUIWhiteResolved.counterpart == openSwiftUIWhiteResolved)
+        #expect(openSwiftUIWhiteResolved.counterpart == swiftUIWhiteResolved)
+    }
+}
+#endif

Tests/OpenSwiftUIBridgeTests/SwiftUI/SwiftUI.EnvironmentValues.swift

@@ -0,0 +1,24 @@
+//
+//  SwiftUI.EnvironmentValues.swift
+//  OpenSwiftUIBridgeTests
+
+#if canImport(SwiftUI)
+import Testing
+import SwiftUI
+import OpenSwiftUI
+import OpenSwiftUIBridge
+
+struct SwiftUI_EnvironmentValues {
+    @Test
+    func example() throws {
+        var swiftUIEnviromentValues = SwiftUI.EnvironmentValues()
+        let openSwiftUIEnviromentValues = OpenSwiftUI.EnvironmentValues()
+        #expect(swiftUIEnviromentValues.colorScheme == .light)
+        #expect(openSwiftUIEnviromentValues.colorScheme == .light)
+        swiftUIEnviromentValues.colorScheme = .dark
+        withKnownIssue {
+            #expect(swiftUIEnviromentValues.counterpart.colorScheme == .dark)
+        }
+    }
+}
+#endif