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|
module type Marker = sig
type t
val of_string : string -> t
val pp : out_channel -> t -> unit
end
module Marker = struct
type t = Point
| Pixel
| Circle
| TriangleDown
| TriangleUp
| TriangleLeft
| TriangleRight
| Custom of string
exception Invalid_marker_length
let of_string s =
if String.length s <> 1
then raise Invalid_marker_length
else Custom(s)
let pp channel n =
(match n with
| Point -> "."
| Pixel -> ","
| Circle -> "o"
| TriangleDown -> "v"
| TriangleUp -> "^"
| TriangleLeft -> ">"
| TriangleRight -> "<"
| Custom(s) -> s)
|> Printf.fprintf channel "%s"
end
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