Migrates All-Pairs Shortest Paths to Swift 3 syntax

kodecocodes · pbodsk · Jan 3, 2017 · Jan 5, 2017 · Jan 5, 2017 · Jan 5, 2017
commit c60c4635cce8f92bb749d9368c857d290ea27658
diff --git a/.travis.yml b/.travis.yml
@@ -8,7 +8,7 @@ install:
 
 script:
 
-# - xcodebuild test -project ./All-Pairs\ Shortest\ Paths/APSP/APSP.xcodeproj -scheme APSPTests
+- xcodebuild test -project ./All-Pairs\ Shortest\ Paths/APSP/APSP.xcodeproj -scheme APSPTests
 - xcodebuild test -project ./Array2D/Tests/Tests.xcodeproj -scheme Tests
 - xcodebuild test -project ./AVL\ Tree/Tests/Tests.xcodeproj -scheme Tests
 - xcodebuild test -project ./Binary\ Search/Tests/Tests.xcodeproj -scheme Tests

diff --git a/All-Pairs Shortest Paths/APSP/APSP.xcodeproj/project.pbxproj b/All-Pairs Shortest Paths/APSP/APSP.xcodeproj/project.pbxproj
@@ -187,14 +187,16 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0730;
-				LastUpgradeCheck = 0730;
+				LastUpgradeCheck = 0820;
 				ORGANIZATIONNAME = "Swift Algorithm Club";
 				TargetAttributes = {
 					493D8DDF1CDD2A1C0089795A = {
 						CreatedOnToolsVersion = 7.3;
+						LastSwiftMigration = 0820;
 					};
 					493D8DF01CDD5B960089795A = {
 						CreatedOnToolsVersion = 7.3;
+						LastSwiftMigration = 0820;
 					};
 				};
 			};
@@ -305,8 +307,10 @@
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				CODE_SIGN_IDENTITY = "-";
@@ -350,8 +354,10 @@
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				CODE_SIGN_IDENTITY = "-";
@@ -370,6 +376,7 @@
 				MACOSX_DEPLOYMENT_TARGET = 10.11;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = macosx;
+				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
 			};
 			name = Release;
 		};
@@ -381,6 +388,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/../Frameworks @loader_path/../Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = "com.swift-algorithm-club.APSPTests";
 				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_VERSION = 3.0;
 			};
 			name = Debug;
 		};
@@ -392,6 +400,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/../Frameworks @loader_path/../Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = "com.swift-algorithm-club.APSPTests";
 				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_VERSION = 3.0;
 			};
 			name = Release;
 		};
@@ -411,6 +420,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "com.swift-algorithm-club.APSP";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
+				SWIFT_VERSION = 3.0;
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
 			};
@@ -432,6 +442,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "com.swift-algorithm-club.APSP";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
+				SWIFT_VERSION = 3.0;
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
 			};

diff --git a/All-Pairs Shortest Paths/APSP/APSP.xcodeproj/xcshareddata/xcschemes/APSP.xcscheme b/All-Pairs Shortest Paths/APSP/APSP.xcodeproj/xcshareddata/xcschemes/APSP.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0730"
+   LastUpgradeVersion = "0820"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"

diff --git a/All-Pairs Shortest Paths/APSP/APSP.xcodeproj/xcshareddata/xcschemes/APSPTests.xcscheme b/All-Pairs Shortest Paths/APSP/APSP.xcodeproj/xcshareddata/xcschemes/APSPTests.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0730"
+   LastUpgradeVersion = "0820"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"

diff --git a/All-Pairs Shortest Paths/APSP/APSP/APSP.swift b/All-Pairs Shortest Paths/APSP/APSP/APSP.swift
@@ -18,7 +18,7 @@ public protocol APSPAlgorithm {
   associatedtype Q: Hashable
   associatedtype P: APSPResult
 
-  static func apply(graph: AbstractGraph<Q>) -> P
+  static func apply(_ graph: AbstractGraph<Q>) -> P
 
 }
 

diff --git a/All-Pairs Shortest Paths/APSP/APSP/FloydWarshall.swift b/All-Pairs Shortest Paths/APSP/APSP/FloydWarshall.swift
@@ -17,7 +17,7 @@ private typealias StepResult = (distances: Distances, predecessors: Predecessors
 
  - note: In all complexity bounds, `V` is the number of vertices in the graph, and `E` is the number of edges.
  */
-public struct FloydWarshall<T where T: Hashable>: APSPAlgorithm {
+public struct FloydWarshall<T>: APSPAlgorithm where T: Hashable {
 
   public typealias Q = T
   public typealias P = FloydWarshallResult<T>
@@ -29,7 +29,7 @@ public struct FloydWarshall<T where T: Hashable>: APSPAlgorithm {
    - complexity: `Θ(V^3)` time, `Θ(V^2)` space
    - returns a `FloydWarshallResult` struct which can be queried for shortest paths and their total weights
    */
-  public static func apply<T>(graph: AbstractGraph<T>) -> FloydWarshallResult<T> {
+  public static func apply<T>(_ graph: AbstractGraph<T>) -> FloydWarshallResult<T> {
 
     var previousDistance = constructInitialDistanceMatrix(graph)
     var previousPredecessor = constructInitialPredecessorMatrix(previousDistance)
@@ -59,12 +59,12 @@ public struct FloydWarshall<T where T: Hashable>: APSPAlgorithm {
    - returns: a tuple containing the next distance matrix with weights of currently known
    shortest paths and the corresponding predecessor matrix
    */
-  static private func nextStep<T>(intermediateIdx: Int, previousDistances: Distances,
+  static fileprivate func nextStep<T>(_ intermediateIdx: Int, previousDistances: Distances,
                                previousPredecessors: Predecessors, graph: AbstractGraph<T>) -> StepResult {
 
     let vertexCount = graph.vertices.count
-    var nextDistances = Array(count: vertexCount, repeatedValue: Array(count: vertexCount, repeatedValue: Double.infinity))
-    var nextPredecessors = Array(count: vertexCount, repeatedValue: Array<Int?>(count: vertexCount, repeatedValue: nil))
+    var nextDistances = Array(repeating: Array(repeating: Double.infinity, count: vertexCount), count: vertexCount)
+    var nextPredecessors = Array(repeating: Array<Int?>(repeating: nil, count: vertexCount), count: vertexCount)
 
     for fromIdx in 0 ..< vertexCount {
       for toIndex in 0 ..< vertexCount {
@@ -97,12 +97,12 @@ public struct FloydWarshall<T where T: Hashable>: APSPAlgorithm {
    - complexity: `Θ(V^2)` time/space
    - returns: weighted adjacency matrix in form ready for processing with Floyd-Warshall
    */
-  static private func constructInitialDistanceMatrix<T>(graph: AbstractGraph<T>) -> Distances {
+  static fileprivate func constructInitialDistanceMatrix<T>(_ graph: AbstractGraph<T>) -> Distances {
 
     let vertices = graph.vertices
 
     let vertexCount = graph.vertices.count
-    var distances = Array(count: vertexCount, repeatedValue: Array(count: vertexCount, repeatedValue: Double.infinity))
+    var distances = Array(repeating: Array(repeating: Double.infinity, count: vertexCount), count: vertexCount)
 
     for row in vertices {
       for col in vertices {
@@ -125,10 +125,10 @@ public struct FloydWarshall<T where T: Hashable>: APSPAlgorithm {
 
    - complexity: `Θ(V^2)` time/space
   */
-  static private func constructInitialPredecessorMatrix(distances: Distances) -> Predecessors {
+  static fileprivate func constructInitialPredecessorMatrix(_ distances: Distances) -> Predecessors {
 
     let vertexCount = distances.count
-    var predecessors = Array(count: vertexCount, repeatedValue: Array<Int?>(count: vertexCount, repeatedValue: nil))
+    var predecessors = Array(repeating: Array<Int?>(repeating: nil, count: vertexCount), count: vertexCount)
 
     for fromIdx in 0 ..< vertexCount {
       for toIdx in 0 ..< vertexCount {
@@ -151,10 +151,10 @@ public struct FloydWarshall<T where T: Hashable>: APSPAlgorithm {
  It conforms to the `APSPResult` procotol which provides methods to retrieve
  distances and paths between given pairs of start and end nodes.
  */
-public struct FloydWarshallResult<T where T: Hashable>: APSPResult {
+public struct FloydWarshallResult<T>: APSPResult where T: Hashable {
 
-  private var weights: Distances
-  private var predecessors: Predecessors
+  fileprivate var weights: Distances
+  fileprivate var predecessors: Predecessors
 
   /**
    - returns: the total weight of the path from a starting vertex to a destination.
@@ -190,7 +190,7 @@ public struct FloydWarshallResult<T where T: Hashable>: APSPResult {
 
    - returns: the list of predecessors discovered so far
    */
-  private func recursePathFrom(fromVertex from: Vertex<T>, toVertex to: Vertex<T>, path: [Vertex<T>],
+  fileprivate func recursePathFrom(fromVertex from: Vertex<T>, toVertex to: Vertex<T>, path: [Vertex<T>],
                                           inGraph graph: AbstractGraph<T>) -> [Vertex<T>]? {
 
     if from.index == to.index {

diff --git a/All-Pairs Shortest Paths/APSP/APSP/Helpers.swift b/All-Pairs Shortest Paths/APSP/APSP/Helpers.swift
@@ -7,10 +7,11 @@
 
 import Foundation
 
+
 /**
  Print a matrix, optionally specifying only the cells to display with the triplet (i, j, k) -> matrix[i][j], matrix[i][k], matrix[k][j]
  */
-func printMatrix(matrix: [[Double]], i: Int = -1, j: Int = -1, k: Int = -1) {
+func printMatrix(_ matrix: [[Double]], i: Int = -1, j: Int = -1, k: Int = -1) {
 
   if i >= 0 {
     print("  k: \(k); i: \(i); j: \(j)\n")
@@ -31,12 +32,12 @@ func printMatrix(matrix: [[Double]], i: Int = -1, j: Int = -1, k: Int = -1) {
     }
     grid.append(row)
   }
-  print((grid as NSArray).componentsJoinedByString("\n"))
+  print((grid as NSArray).componentsJoined(by: "\n"))
   print(" =======================")
 
 }
 
-func printIntMatrix(matrix: [[Int?]]) {
+func printIntMatrix(_ matrix: [[Int?]]) {
 
   var grid = [String]()
 
@@ -46,14 +47,14 @@ func printIntMatrix(matrix: [[Int?]]) {
     for y in 0..<n {
       if let value = matrix[x][y] {
         let valueString = NSString(format: "%i", value)
-        row += "\(matrix[x][y] >= 0 ? " " : "")\(valueString) "
+        row += "\(value >= 0 ? " " : "")\(valueString) "
       } else {
         row += "  ø  "
       }
     }
     grid.append(row)
   }
-  print((grid as NSArray).componentsJoinedByString("\n"))
+  print((grid as NSArray).componentsJoined(by: "\n"))
   print(" =======================")
 
 }
diff --git a/All-Pairs Shortest Paths/APSP/APSPTests/APSPTests.swift b/All-Pairs Shortest Paths/APSP/APSPTests/APSPTests.swift
@@ -9,7 +9,7 @@ import APSP
 import Graph
 import XCTest
 
-struct TestCase<T where T: Hashable> {
+struct TestCase<T> where T: Hashable {
 
   var from: Vertex<T>
   var to: Vertex<T>
@@ -71,7 +71,7 @@ class APSPTests: XCTestCase {
 
     for testCase: TestCase<Int> in cases {
       if let computedPath = result.path(fromVertex: testCase.from, toVertex: testCase.to, inGraph: graph),
-              computedDistance = result.distance(fromVertex: testCase.from, toVertex: testCase.to) {
+         let computedDistance = result.distance(fromVertex: testCase.from, toVertex: testCase.to) {
         XCTAssert(computedDistance == testCase.expectedDistance, "expected distance \(testCase.expectedDistance) but got \(computedDistance)")
         XCTAssert(computedPath == testCase.expectedPath, "expected path \(testCase.expectedPath) but got \(computedPath)")
       }
@@ -111,7 +111,7 @@ class APSPTests: XCTestCase {
 
     for testCase: TestCase<Int> in cases {
       if let computedPath = result.path(fromVertex: testCase.from, toVertex: testCase.to, inGraph: graph),
-        computedDistance = result.distance(fromVertex: testCase.from, toVertex: testCase.to) {
+        let computedDistance = result.distance(fromVertex: testCase.from, toVertex: testCase.to) {
         XCTAssert(computedDistance == testCase.expectedDistance, "expected distance \(testCase.expectedDistance) but got \(computedDistance)")
         XCTAssert(computedPath == testCase.expectedPath, "expected path \(testCase.expectedPath) but got \(computedPath)")
       }