Added Logger and LogStringConvertible protocols

Logger.xcodeproj/project.pbxproj

@@ -8,6 +8,7 @@
 
 /* Begin PBXBuildFile section */
 		2EBF4B3E2122AA34008E4117 /* Logger.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2EBF4B3D2122AA34008E4117 /* Logger.swift */; };
+		2EBF4B452122ACD6008E4117 /* LogStringConvertible.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2EBF4B442122ACD6008E4117 /* LogStringConvertible.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXCopyFilesBuildPhase section */
@@ -25,6 +26,7 @@
 /* Begin PBXFileReference section */
 		2EBF4B3A2122AA34008E4117 /* libLogger.a */ = {isa = PBXFileReference; explicitFileType = archive.ar; includeInIndex = 0; path = libLogger.a; sourceTree = BUILT_PRODUCTS_DIR; };
 		2EBF4B3D2122AA34008E4117 /* Logger.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Logger.swift; sourceTree = "<group>"; };
+		2EBF4B442122ACD6008E4117 /* LogStringConvertible.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = LogStringConvertible.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -57,6 +59,7 @@
 		2EBF4B3C2122AA34008E4117 /* Logger */ = {
 			isa = PBXGroup;
 			children = (
+				2EBF4B442122ACD6008E4117 /* LogStringConvertible.swift */,
 				2EBF4B3D2122AA34008E4117 /* Logger.swift */,
 			);
 			path = Logger;
@@ -120,6 +123,7 @@
 			buildActionMask = 2147483647;
 			files = (
 				2EBF4B3E2122AA34008E4117 /* Logger.swift in Sources */,
+				2EBF4B452122ACD6008E4117 /* LogStringConvertible.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};

Logger/LogStringConvertible.swift

@@ -0,0 +1,37 @@
+//
+// MIT License
+//
+// Copyright (c) 2018 Wojciech Nagrodzki
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+//
+
+import Foundation
+
+public protocol LogStringConvertible {
+    var logDescription: String { get }
+}
+
+extension Array: LogStringConvertible where Element: LogStringConvertible {
+    public var logDescription: String {
+        let descriptions = map { $0.logDescription }
+        let joinedDescriptions = descriptions.joined(separator: ", ")
+        return "[" + joinedDescriptions + "]"
+    }
+}

Logger/Logger.swift

@@ -22,6 +22,56 @@
 // SOFTWARE.
 //
 
-class Logger {
+import Foundation
 
+public protocol Logger {
+    func log(time: String, level: LogLevel, location: String, object: String)
+    
+    func description(for date: Date) -> String
+    func description(for file: String, line: Int, function: String) -> String
+    func description(for object: Any) -> String
 }
+
+public enum LogLevel: String {
+    case `default` = "Default"
+    case info = "Info"
+    case debug = "Debug"
+    case error = "Error"
+    case fault = "Fault"
+}
+
+extension Logger {
+    public func log(_ object: Any, level: LogLevel = .default, file: String = #file, line: Int = #line, function: String = #function) {
+        let now = Date()
+        let time = description(for: now)
+        let location = description(for: file, line: line, function: function)
+        let objectDescription = description(for: object)
+        log(time: time, level: level, location: location, object: objectDescription)
+    }
+    
+    public func description(for date: Date) -> String {
+        return dateFormatter.string(from: date)
+    }
+    
+    public func description(for file: String, line: Int, function: String) -> String {
+        return filename(fromFilePath: file) + ":\(line) \(function)"
+    }
+    
+    public func description(for object: Any) -> String {
+        if let logStringConvertible = object as? LogStringConvertible {
+            return logStringConvertible.logDescription
+        }
+        return String(describing: object)
+    }
+    
+    private func filename(fromFilePath path: String) -> String {
+        return URL(fileURLWithPath: path).deletingPathExtension().lastPathComponent
+    }
+}
+
+private let dateFormatter: DateFormatter = {
+    let formatter = DateFormatter()
+    formatter.dateFormat = "yyyy-MM-dd HH:mm:ss.SSS"
+    formatter.timeZone = TimeZone(secondsFromGMT: 0)
+    return formatter
+}()