Adds swift demo.

demos/swift/.gitignore

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+.DS_Store
+/.build
+/Packages
+/*.xcodeproj
+xcuserdata/

demos/swift/.vscode/launch.json

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+// .vscode/launch.json
+{
+	"version": "0.2.0",
+	"configurations": [
+		// Running executables
+		{
+			"type": "lldb",
+			"request": "launch",
+			"name": "Run your Executable",
+			"program": "${workspaceFolder}/.build/debug/swiftDemo",
+			"args": [],
+			"cwd": "${workspaceFolder}",
+			"preLaunchTask": "swift-build"
+		}
+	]
+}

demos/swift/.vscode/settings.json

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+{
+	// You need to adapt this path to your swift installation.
+	// See here for more info:
+	// https://github.com/vadimcn/vscode-lldb/issues/234
+	"lldb.library": "/home/hediet/swift-5.1.5-RELEASE-ubuntu14.04/usr/lib/liblldb.so"
+}

demos/swift/.vscode/tasks.json

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+{
+	"version": "2.0.0",
+	"tasks": [
+		// compile your SPM project
+		{
+			"label": "swift-build",
+			"type": "shell",
+			"command": "swift build" // for TensorFlow add -Xlinker -ltensorflow
+		},
+		// compile your SPM tests
+		{
+			"label": "swift-build-tests",
+			"type": "process",
+			"command": "swift",
+			"group": "build",
+			"args": [
+				"build",
+				"--build-tests"
+				// for TensorFlow add "-Xlinker", "-ltensorflow"
+			]
+		}
+	]
+}

demos/swift/Package.swift

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+// swift-tools-version:5.1
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "swiftDemo",
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        // .package(url: /* package url */, from: "1.0.0"),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages which this package depends on.
+        .target(
+            name: "swiftDemo",
+            dependencies: []),
+        .testTarget(
+            name: "swiftDemoTests",
+            dependencies: ["swiftDemo"]),
+    ]
+)

demos/swift/Sources/swiftDemo/main.swift

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+let s = "{\"kind\":{\"graph\":true},"
+        + "\"nodes\":[{\"id\":\"1\"},{\"id\":\"2\"}],"
+        + "\"edges\":[{\"from\":\"1\",\"to\":\"2\"}]}";
+
+print(s)

demos/swift/Tests/LinuxMain.swift

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+import XCTest
+
+import swiftTests
+
+var tests = [XCTestCaseEntry]()
+tests += swiftTests.allTests()
+XCTMain(tests)

demos/swift/Tests/swiftDemoTests/XCTestManifests.swift

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+import XCTest
+
+#if !canImport(ObjectiveC)
+public func allTests() -> [XCTestCaseEntry] {
+    return [
+        testCase(swiftTests.allTests),
+    ]
+}
+#endif

demos/swift/Tests/swiftDemoTests/swiftDemoTests.swift

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+import XCTest
+import class Foundation.Bundle
+
+final class swiftTests: XCTestCase {
+    func testExample() throws {
+        // This is an example of a functional test case.
+        // Use XCTAssert and related functions to verify your tests produce the correct
+        // results.
+
+        // Some of the APIs that we use below are available in macOS 10.13 and above.
+        guard #available(macOS 10.13, *) else {
+            return
+        }
+
+        let fooBinary = productsDirectory.appendingPathComponent("swift")
+
+        let process = Process()
+        process.executableURL = fooBinary
+
+        let pipe = Pipe()
+        process.standardOutput = pipe
+
+        try process.run()
+        process.waitUntilExit()
+
+        let data = pipe.fileHandleForReading.readDataToEndOfFile()
+        let output = String(data: data, encoding: .utf8)
+
+        XCTAssertEqual(output, "Hello, world!\n")
+    }
+
+    /// Returns path to the built products directory.
+    var productsDirectory: URL {
+      #if os(macOS)
+        for bundle in Bundle.allBundles where bundle.bundlePath.hasSuffix(".xctest") {
+            return bundle.bundleURL.deletingLastPathComponent()
+        }
+        fatalError("couldn't find the products directory")
+      #else
+        return Bundle.main.bundleURL
+      #endif
+    }
+
+    static var allTests = [
+        ("testExample", testExample),
+    ]
+}

demos/swift/main.swift

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+import Swift
+print("Hello, World!")