Source file location.ml

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type point = int
type zone = { a : point
            ; b : point }
type t = zone option

type 'a with_location = { value : 'a; location : t }
type 'a w = 'a with_location = { value : 'a; location : t }

let make a b =
  if a < 0 || b < 0 then Fmt.invalid_arg "A point must be positive" ;
  if a > b then Fmt.invalid_arg "[a] must be lower or equal to [b]" ;
  Some { a; b; }

let some zone = Some zone
let none = None

let union a b = match a, b with
  | None, None -> None
  | Some _, None -> a
  | None, Some _ -> b
  | Some { a; b; }, Some { a= x; b= y} ->
    let a = (min : int -> int -> int) a x in
    let b = (max : int -> int -> int) b y in
    Some { a; b; }

let pp ppf = function
  | Some { a; b; } -> Fmt.pf ppf "%d:%d" a b
  | None -> Fmt.string ppf "<none>"

let left = function
  | Some { a; _ } -> Some a
  | None -> None

let left_exn t = match left t with
  | Some left -> left
  | None -> Fmt.invalid_arg "<dummy location>"

let right = function
  | Some { b; _ } -> Some b
  | None -> None

let right_exn t = match right t with
  | Some right -> right
  | None -> Fmt.invalid_arg "<dummy location>"

let length = function
  | Some { a; b; } -> Some (b - a)
  | None -> None

let length_exn t = match length t with
  | Some length -> length
  | None -> Fmt.invalid_arg "<dummy location>"

let without_location : 'a with_location -> 'a =
  fun { value; _ } -> value

let location { location; _ } = location

let with_location ~location v =
  { value= v; location; }

let inj = with_location
let prj = without_location