Pass a Logger to Parameters (#116)

* Add swift-log to the dependencies

* Add a logger to parameters. Create a second initializer

* Change logger from private to public

Package.swift

@@ -9,9 +9,13 @@ let package = Package(
     products: [
         .library(name: "RoutingKit", targets: ["RoutingKit"]),
     ],
-    dependencies: [ ],
+    dependencies: [
+        .package(url: "https://github.com/apple/swift-log.git", from: "1.4.2")
+    ],
     targets: [
-        .target(name: "RoutingKit"),
+        .target(name: "RoutingKit", dependencies: [
+            .product(name: "Logging", package: "swift-log"),
+        ]),
         .testTarget(name: "RoutingKitTests", dependencies: ["RoutingKit"]),
     ]
 )

Sources/RoutingKit/Parameters.swift

@@ -1,4 +1,5 @@
 import Foundation
+import Logging
 
 /// Holds dynamic path components that were discovered while routing.
 ///
@@ -11,13 +12,25 @@ public struct Parameters {
     /// Internal storage.
     private var values: [String: String]
     private var catchall: Catchall
+    public let logger: Logger
 
     /// Creates a new `Parameters`.
     ///
     /// Pass this into the `Router.route(path:parameters:)` method to fill with values.
     public init() {
         self.values = [:]
         self.catchall = Catchall()
+        self.logger = Logger(label: "routing-kit-parameters-logger")
+    }
+
+    /// Creates a new `Parameters`.
+    /// Pass this into the `Router.route(path:parameters:)` method to fill with values.
+    /// - Parameters:
+    ///     - logger: The logger to be used. If none is provided, a default one will be created.
+    public init(_ logger: Logger?) {
+        self.values = [:]
+        self.catchall = Catchall()
+        self.logger = logger ?? Logger(label: "routing-kit-parameters-logger")
     }
 
     /// Grabs the named parameter from the parameter bag.