let cCAMLtoTKmodifier : modifier -> string = function
 | `Control -> "Control-"
 | `Shift -> "Shift-"
 | `Lock -> "Lock-"
 | `Button1 -> "Button1-"
 | `Button2 -> "Button2-"
 | `Button3 -> "Button3-"
 | `Button4 -> "Button4-"
 | `Button5 -> "Button5-"
 | `Double -> "Double-"
 | `Triple -> "Triple-"
 | `Mod1 -> "Mod1-"
 | `Mod2 -> "Mod2-"
 | `Mod3 -> "Mod3-"
 | `Mod4 -> "Mod4-"
 | `Mod5 -> "Mod5-"
 | `Meta -> "Meta-"
 | `Alt -> "Alt-"

let cCAMLtoTKevent (ev : event) =
  let rec convert = function
  | `ButtonPress -> "ButtonPress"
  | `ButtonPressDetail n -> "ButtonPress-"^string_of_int n
  | `ButtonRelease -> "ButtonRelease"
  | `ButtonReleaseDetail n -> "ButtonRelease-"^string_of_int n
  | `Circulate -> "Circulate"
  | `ColorMap -> "ColorMap"
  | `Configure -> "Configure"
  | `Destroy -> "Destroy"
  | `Enter -> "Enter"
  | `Expose -> "Expose"
  | `FocusIn -> "FocusIn"
  | `FocusOut -> "FocusOut"
  | `Gravity -> "Gravity"
  | `KeyPress -> "KeyPress"
  | `KeyPressDetail s -> "KeyPress-"^s
  | `KeyRelease -> "KeyRelease"
  | `KeyReleaseDetail s -> "KeyRelease-"^s
  | `Leave -> "Leave"
  | `Map -> "Map"
  | `Motion -> "Motion"
  | `Property -> "Property"
  | `Reparent -> "Reparent"
  | `Unmap -> "Unmap"
  | `Visibility -> "Visibility"
  | `Modified(ml, ev) ->
      String.concat ~sep:"" (List.map ~f:cCAMLtoTKmodifier ml)
      ^ convert ev
  in "<" ^ convert ev ^ ">"

let cCAMLtoTKeventSequence (l : event list) = 
  TkToken(String.concat ~sep:"" (List.map ~f:cCAMLtoTKevent l))