ADDED swift test file for syntax highlighting

tests/syntax-tests/source/Swift/test.swift

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+class Person {
+// We can define class property here
+var age  = 25
+// Implement Class initializer. Initializers are called when a new object of this class is created
+init() { 
+   print(“A new instance of this class Person is created.”) 
+ } 
+} 
+// We can now create an instance of class Person - an object - by putting parentheses after the class name
+let personObj =  Person()
+// Once an instance of Person class is created we can access its properties using the dot “.” syntax.
+print(“This person age is \(personObj.age)”)
+
+import Foundation
+class Friend : Comparable {
+    let name : String
+    let age : Int
+    
+    init(name : String, age: Int) {
+        self.name = name
+        self.age = age
+    }
+}
+func < (lhs: Friend, rhs: Friend) -> Bool {
+    return lhs.age < rhs.age } func > (lhs: Friend, rhs: Friend) -> Bool {
+    return lhs.age > rhs.age
+}
+func == (lhs: Friend, rhs: Friend) -> Bool {
+    var returnValue = false
+    if (lhs.name == rhs.name) && (lhs.age == rhs.age)
+    {
+        returnValue = true
+    }
+    return returnValue
+}
+
+  let friend1 = Friend(name: "Sergey", age: 35)
+        let friend2 = Friend(name: "Sergey", age: 30)
+        
+        print("\Compare Friend object. Same person? (friend1 == friend2)")
+
+func sayHelloWorld() {
+    print("Hello World")
+}
+// Call function
+sayHelloWorld()
+
+func printOutFriendNames(names: String...)  {
+  
+    for name in names {
+ 
+        print(name)
+    }
+ 
+}
+// Call the printOutFriendNames with two parameters
+printOutFriendNames("Sergey", "Bill")
+// Call the function with more parameters
+printOutFriendNames("Sergey", "Bill", "Max")
+
+let simpleClosure = {
+    print("From a simpleClosure")
+}
+// Call closure
+simpleClosure() 
+
+let fullName = { (firstName:String, lastName:String)->String in
+    return firstName + " " + lastName
+}
+// Call Closure
+let myFullName = fullName("Sergey", "Kargopolov")
+print("My full name is \(myFullName)")
+
+let myDictionary = [String:String]()
+// Another way to create an empty dictionary
+let myDictionary2:[String:String] = [:]
+// Keys in dictionary can also be of type Int
+let myDictionary3 = [Int:String]()
+
+var myDictionary = ["first_name": "Sergey", "last_name": "Kargopolov"]
+// print to preview
+print(myDictionary)
+// Add a new key with a value
+myDictionary["user_id"] = "f5h7ru0tJurY8f7g5s6fd"
+// We should now have 3 key value pairs printed
+print(myDictionary)
+
+var myDictionary = ["first_name": "Sergey", "last_name": "Kargopolov"]
+// Loop through dictionary keys and print values
+for (key,value) in myDictionary {
+    print("\(key) = \(value)")
+}
+ class Friend {
+    let name : String
+    let age : Int
+    
+    init(name : String, age: Int) {
+        self.name = name
+        self.age = age
+    }
+}
+
+ var friends:[Friend] = []
+        
+        let friend1 = Friend(name: "Sergey", age: 30)
+        let friend2 = Friend(name: "Bill", age: 35)
+        let friend3 = Friend(name: "Michael", age: 21)
+        
+        friends.append(friend1)
+        friends.append(friend2)
+        friends.append(friend3)
+        
+        printFriends(friends: friends)
+        
+        // Get sorted array in descending order (largest to the smallest number)
+        let sortedFriends = friends.sorted(by: { $0.age > $1.age })
+        printFriends(friends: sortedFriends)
+        
+        // Get sorted array in ascending order (smallest to the largest number)
+        let sortedFriendsAscendingOrder = friends.sorted(by: { $0.age < $1.age })
+        printFriends(friends: sortedFriendsAscendingOrder)
+
+
+ func printFriends(friends: [Friend])
+    {
+        for friendEntry in friends {
+            print("Name: \(friendEntry.name), age: \(friendEntry.age)")
+        }
+    }
+
+import UIKit
+class ViewController: UIViewController  {
+override func viewDidLoad() {
+    super.viewDidLoad()
+}
+override func viewWillAppear(_ animated: Bool) {
+    super.viewWillAppear(animated)
+    
+    // Create destination URL 
+    let documentsUrl:URL =  FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first as URL!
+    let destinationFileUrl = documentsUrl.appendingPathComponent("downloadedFile.jpg")
+    
+    //Create URL to the source file you want to download
+    let fileURL = URL(string: "https://s3.amazonaws.com/learn-swift/IMG_0001.JPG")
+    
+    let sessionConfig = URLSessionConfiguration.default
+    let session = URLSession(configuration: sessionConfig)
+ 
+    let request = URLRequest(url:fileURL!)
+    
+    let task = session.downloadTask(with: request) { (tempLocalUrl, response, error) in
+        if let tempLocalUrl = tempLocalUrl, error == nil {
+            // Success
+            if let statusCode = (response as? HTTPURLResponse)?.statusCode {
+                print("Successfully downloaded. Status code: \(statusCode)")
+            }
+            
+            do {
+                try FileManager.default.copyItem(at: tempLocalUrl, to: destinationFileUrl)
+            } catch (let writeError) {
+                print("Error creating a file \(destinationFileUrl) : \(writeError)")
+            }
+            
+        } else {
+            print("Error took place while downloading a file. Error description: %@", error?.localizedDescription);
+        }
+    }
+    task.resume()
+    
+  }
+}
+
+  do {
+            
+            // Convert JSON Object received from server side into Swift NSArray.
+            // Note the use "try"
+            if let convertedJsonIntoArray = try JSONSerialization.JSONObjectWithData(data!, options: []) as? NSArray {
+            }
+            
+        } catch let error as NSError {
+            print(error.localizedDescription)
+        }
+
+DispatchQueue.global(qos: .userInitiated).async {
+            // Do some time consuming task in this background thread
+            // Mobile app will remain to be responsive to user actions
+            
+            print("Performing time consuming task in this background thread")
+            
+           DispatchQueue.main.async {
+                // Task consuming task has completed
+                // Update UI from this block of code
+                print("Time consuming task has completed. From here we are allowed to update user interface.")
+            }
+        }
+
+import UIKit
+class ViewController: UIViewController {
+    
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        // Do any additional setup after loading the view, typically from a nib.
+        
+        let button = UIButton(type: UIButtonType.system) as UIButton
+        
+        let xPostion:CGFloat = 50
+        let yPostion:CGFloat = 100
+        let buttonWidth:CGFloat = 150
+        let buttonHeight:CGFloat = 45
+        
+        button.frame = CGRect(x:xPostion, y:yPostion, width:buttonWidth, height:buttonHeight)
+        
+        button.backgroundColor = UIColor.lightGray
+        button.setTitle("Tap me", for: UIControlState.normal)
+        button.tintColor = UIColor.black
+        button.addTarget(self, action: #selector(ViewController.buttonAction(_:)), for: .touchUpInside)
+        
+        self.view.addSubview(button)
+    }
+    
+    func buttonAction(_ sender:UIButton!)
+    {
+        print("Button tapped")
+    }
+    
+    override func didReceiveMemoryWarning() {
+        super.didReceiveMemoryWarning()
+        // Dispose of any resources that can be recreated.
+    }
+    
+    
+}
+
+import UIKit
+class ViewController: UIViewController {
+    
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        
+        //Create Activity Indicator
+        let myActivityIndicator = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.gray)
+        
+        // Position Activity Indicator in the center of the main view
+        myActivityIndicator.center = view.center
+        
+        // If needed, you can prevent Acivity Indicator from hiding when stopAnimating() is called
+        myActivityIndicator.hidesWhenStopped = false
+        
+        // Start Activity Indicator
+        myActivityIndicator.startAnimating()
+        
+        // Call stopAnimating() when need to stop activity indicator
+        //myActivityIndicator.stopAnimating()
+        
+        
+        view.addSubview(myActivityIndicator)
+    }
+    
+    override func didReceiveMemoryWarning() {
+        super.didReceiveMemoryWarning()
+    }
+    
+}
+
+
+
+
+