Add SwiftPM support

Highlightr.podspec

@@ -30,7 +30,7 @@ Pod::Spec.new do |s|
 
   s.source_files = 'Pod/Classes/**/*.{swift}'
 
-  s.resources  = 'Pod/Assets/**/*.{css,js}'
+  s.resource  = 'Assets/highlighter.bundle'
 
   s.ios.frameworks = 'UIKit'
   s.osx.frameworks = 'AppKit'

Package.swift

@@ -0,0 +1,30 @@
+// swift-tools-version:5.3
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+import PackageDescription
+
+let package = Package(
+    name: "Highlightr",
+    platforms: [
+        .macOS(.v10_11),
+        .iOS(.v9),
+        .tvOS(.v9)
+    ],
+    products: [
+        // Products define the executables and libraries a package produces, and make them visible to other packages.
+        .library(
+            name: "Highlightr",
+            targets: ["Highlightr"])
+    ],
+    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 this package depends on.
+        .target(
+            name: "Highlightr",
+            path: "Pod",
+            sources: ["Classes"],
+            resources: [         // require swift-tools-version:5.3
+                .copy("Assets/highlighter.bundle")
+            ]
+        )
+    ]
+)

Pod/Classes/CodeAttributedString.swift

@@ -10,6 +10,8 @@ import Foundation
 
 #if os(OSX)
     import AppKit
+#else
+    import UIKit
 #endif
 
 /// Highlighting Delegate

Pod/Classes/Highlightr.swift

@@ -9,10 +9,6 @@
 import Foundation
 import JavaScriptCore
 
-#if os(OSX)
-    import AppKit
-#endif
-
 /// Utility class for generating a highlighted NSAttributedString from a String.
 open class Highlightr
 {
@@ -53,8 +49,11 @@ open class Highlightr
         let window = JSValue(newObjectIn: jsContext)
         jsContext.setObject(window, forKeyedSubscript: "window" as NSString)
 
-        let bundle = Bundle(for: Highlightr.self)
-        self.bundle = bundle
+#if SWIFT_PACKAGE
+        self.bundle = Bundle(path: Bundle.module.path(forResource: "highlighter", ofType: "bundle")!)!
+#else
+        self.bundle = Bundle(path: Bundle(for: Highlightr.self).path(forResource: "highlighter", ofType: "bundle")!)!
+#endif
         guard let hgPath = highlightPath ?? bundle.path(forResource: "highlight.min", ofType: "js") else
         {
             return nil
@@ -89,7 +88,7 @@ open class Highlightr
     @discardableResult
     open func setTheme(to name: String) -> Bool
     {
-        guard let defTheme = bundle.path(forResource: name+".min", ofType: "css") else
+        guard let defTheme = bundle.path(forResource: name+".min", ofType: "css", inDirectory: "styles") else
         {
             return false
         }
@@ -156,7 +155,7 @@ open class Highlightr
      */
     open func availableThemes() -> [String]
     {
-        let paths = bundle.paths(forResourcesOfType: "css", inDirectory: nil) as [NSString]
+        let paths = bundle.paths(forResourcesOfType: "css", inDirectory: "styles") as [NSString]
         var result = [String]()
         for path in paths {
             result.append(path.lastPathComponent.replacingOccurrences(of: ".min.css", with: ""))

Pod/Classes/Shims.swift

@@ -10,6 +10,8 @@ import Foundation
 
 #if os(OSX)
     import AppKit
+#else
+    import UIKit
 #endif
 
 #if swift(>=4.2)