1 files changed, 59 insertions, 0 deletions
diff --git a/Sources/DDHotKey/DDHotKeyTranslation.swift b/Sources/DDHotKey/DDHotKeyTranslation.swift
new file mode 100644
index 0000000..ce66d0d
--- /dev/null
+++ b/Sources/DDHotKey/DDHotKeyTranslation.swift
@@ -0,0 +1,59 @@
+//
+//  DDHotKeyTranslation.swift
+//  DDHotKey
+//
+//  Created by Dave DeLong on 8/28/19.
+//
+
+import Cocoa
+import Carbon
+
+fileprivate let standardModifiers: Dictionary<Int, NSEvent.ModifierFlags> = [
+    kVK_Option: .option,
+    kVK_Shift: .shift,
+    kVK_Command: .command,
+    kVK_Control: .control
+]
+
+internal func keyCodeAndModifiers(from string: String) -> (CGKeyCode, NSEvent.ModifierFlags)? {
+    var flags = NSEvent.ModifierFlags()
+    var keyCode: Int?
+    
+    for character in string {
+        guard let code = keycode(for: String(character)) else { return nil }
+        if let modifier = standardModifiers[code] {
+            flags.insert(modifier)
+        } else if keyCode == nil {
+            keyCode = code
+        } else {
+            return nil
+        }
+    }
+    
+    guard let code = keyCode else { return nil }
+    
+    return (CGKeyCode(code), flags)
+}
+
+internal func stringFrom(keyCode: CGKeyCode, modifiers: NSEvent.ModifierFlags) -> String {
+    var final = ""
+    if modifiers.contains(.control) {
+        final += string(for: kVK_Control)!
+    }
+    if modifiers.contains(.option) {
+        final += string(for: kVK_Option)!
+    }
+    if modifiers.contains(.shift) {
+        final += string(for: kVK_Shift)!
+    }
+    if modifiers.contains(.command) {
+        final += string(for: kVK_Command)!
+    }
+    
+    if standardModifiers[Int(keyCode)] != nil { return final }
+    
+    if let mapped = string(for: Int(keyCode), carbonModifiers: carbonModifiers(from: modifiers)) {
+        final += mapped
+    }
+    return final
+}