X-Git-Url: https://git.xandkar.net/?a=blobdiff_plain;f=polymorphism%2F001%2Fsrc%2Fpolymorphism.ml;h=c2f0c3e5caff035ad83cfa1c95ba8e997cffd212;hb=46aacfbc9482c1b72d6c69d6b6e323a2ea33719f;hp=8bb161176c2d62c7991ecef68f7e1116550d7538;hpb=c238c90353d4704a4b121390e236bbf5e7f4d27e;p=cellular-automata.git

diff --git a/polymorphism/001/src/polymorphism.ml b/polymorphism/001/src/polymorphism.ml
index 8bb1611..c2f0c3e 100644
--- a/polymorphism/001/src/polymorphism.ml
+++ b/polymorphism/001/src/polymorphism.ml
@@ -4,7 +4,8 @@ open Core.Std
 let (|-) g f x = f (g x)
 
 
-module Terminal : sig
+module Terminal :
+sig
   type color = [ `green
                | `red
                | `white
@@ -15,7 +16,8 @@ module Terminal : sig
   val clear : unit -> unit
 
   val reset : unit -> unit
-end = struct
+end =
+struct
   type color = [ `green
                | `red
                | `white
@@ -40,14 +42,16 @@ end = struct
 end
 
 
-module type MATRIX = sig
-  module Point : sig
+module Matrix :
+sig
+  module Point :
+  sig
     type t = {r : int; k : int}
   end
 
   type 'a t
 
-  val create : rs:int -> ks:int -> 'a -> 'a t
+  val make : rs:int -> ks:int -> 'a -> 'a t
 
   val get_neighbors : 'a t -> Point.t -> 'a list
 
@@ -58,10 +62,10 @@ module type MATRIX = sig
   val iter : 'a t -> f:(Point.t -> 'a -> unit) -> unit
 
   val print : 'a t -> to_string:('a -> string) -> unit
-end
-
-module Matrix : MATRIX = struct
-  module Point = struct
+end =
+struct
+  module Point =
+  struct
     type t = {r : int; k : int}
 
     let (+) p p' =
@@ -70,7 +74,8 @@ module Matrix : MATRIX = struct
       }
   end
 
-  module Direction = struct
+  module Direction =
+  struct
     type t = NW | N | NE
            | W  |     E
            | SW | S | SE
@@ -95,7 +100,7 @@ module Matrix : MATRIX = struct
 
   type 'a t = 'a array array
 
-  let create ~rs ~ks x =
+  let make ~rs ~ks x =
     Array.make_matrix ~dimx:rs ~dimy:ks x
 
   let iter t ~f =
@@ -138,7 +143,7 @@ module Matrix : MATRIX = struct
 
   let neighborhood t point =
     List.map Direction.all ~f:Direction.to_offset
-    |> List.map ~f:(fun offset_point -> Point.(point + offset_point))
+    |> List.map ~f:(Point.(+) point)
     |> List.filter ~f:(is_within_bounds t)
 
   let get_neighbors t point =
@@ -146,18 +151,20 @@ module Matrix : MATRIX = struct
 end
 
 
-module PhenoType : sig
+module PhenoType :
+sig
   type t
 
-  val create : char -> Terminal.color option -> t
+  val make : char -> Terminal.color option -> t
 
   val to_string : t -> string
-end = struct
+end =
+struct
   type t = { color     : Terminal.color option
            ; character : char
            }
 
-  let create character color =
+  let make character color =
     {color; character}
 
   let to_string = function
@@ -168,8 +175,10 @@ end = struct
 end
 
 
-module Cell = struct
-  module State = struct
+module Cell =
+struct
+  module State =
+  struct
     type intention = Friendly
                    | Neutral
                    | Hostile
@@ -184,8 +193,9 @@ module Cell = struct
 end
 
 
-module type RULE = sig
-  val create : unit -> Cell.t
+module type RULE =
+sig
+  val init : unit -> Cell.t
 
   val transition : self:Cell.State.t
                 -> neighbors:Cell.State.t list
@@ -193,32 +203,38 @@ module type RULE = sig
 end
 
 
-module Life : RULE = struct
-  module State : sig
+module Life : RULE =
+struct
+  module State :
+  sig
     type t = D | A
 
-    val of_int : int -> t
+    val random : unit -> t
 
-    val to_int : t -> int
+    val is_alive : t -> bool
 
     val to_cell : t -> Cell.t
 
     val of_cell_state : Cell.State.t -> t
-  end = struct
+
+    val next : t -> live_neighbors:int -> t
+  end =
+  struct
     type t = D | A
 
-    let of_int = function
+    let random () =
+      match Random.int 2 with
       | 0 -> D
       | 1 -> A
       | _ -> assert false
 
-    let to_int = function
-      | D -> 0
-      | A -> 1
+    let is_alive = function
+      | D -> false
+      | A -> true
 
     let to_pheno = function
-      | D -> PhenoType.create ' ' None
-      | A -> PhenoType.create 'o' (Some `white)
+      | D -> PhenoType.make ' ' None
+      | A -> PhenoType.make 'o' (Some `white)
 
     let of_cell_state = function
       | Cell.State.Dead                      -> D
@@ -234,45 +250,49 @@ module Life : RULE = struct
       { Cell.state = t |> to_cell_state
       ; Cell.pheno = t |> to_pheno
       }
-  end
 
-  let next state ~live_neighbors =
-    match state with
-    | State.A when live_neighbors < 2 -> State.D
-    | State.A when live_neighbors < 4 -> State.A
-    | State.A when live_neighbors > 3 -> State.D
-    | State.D when live_neighbors = 3 -> State.A
-    | State.A -> State.A
-    | State.D -> State.D
+    let next t ~live_neighbors =
+      match t with
+      | A when live_neighbors < 2 -> D
+      | A when live_neighbors < 4 -> A
+      | A when live_neighbors > 3 -> D
+      | D when live_neighbors = 3 -> A
+      | A -> A
+      | D -> D
+  end
 
-  let create () =
-    Random.int 2 |> State.of_int |> State.to_cell
+  let init =
+    State.random |- State.to_cell
 
-  let live_neighbors neighbors =
-    neighbors |> List.map ~f:(State.of_cell_state |- State.to_int)
-              |> List.fold_left ~init:0 ~f:(+)
+  let count_of_live =
+       List.map    ~f:State.of_cell_state
+    |- List.filter ~f:State.is_alive
+    |- List.length
 
   let transition ~self ~neighbors =
     self |> State.of_cell_state
-         |> next ~live_neighbors:(live_neighbors neighbors)
+         |> State.next ~live_neighbors:(count_of_live neighbors)
          |> State.to_cell
 end
 
 
-module ForestFire : RULE = struct
-  module State : sig
+module ForestFire : RULE =
+struct
+  module State :
+  sig
     type t = E | T | B
 
     val is_burning : t -> bool
 
-    val of_int : int -> t
-
-    val to_int : t -> int
+    val random : unit -> t
 
     val to_cell : t -> Cell.t
 
     val of_cell_state : Cell.State.t -> t
-  end = struct
+
+    val next : t -> burning_neighbors:int -> t
+  end =
+  struct
     type t = E | T | B
 
     let is_burning = function
@@ -280,21 +300,17 @@ module ForestFire : RULE = struct
       | T -> false
       | B -> true
 
-    let of_int = function
+    let random () =
+      match Random.int 3 with
       | 0 -> E
       | 1 -> T
       | 2 -> B
       | _ -> assert false
 
-    let to_int = function
-      | E -> 0
-      | T -> 1
-      | B -> 2
-
     let to_pheno = function
-      | E -> PhenoType.create ' ' None
-      | T -> PhenoType.create 'T' (Some `green)
-      | B -> PhenoType.create '#' (Some `red)
+      | E -> PhenoType.make ' ' None
+      | T -> PhenoType.make 'T' (Some `green)
+      | B -> PhenoType.make '#' (Some `red)
 
     let of_cell_state = function
       | Cell.State.Dead                      -> E
@@ -311,50 +327,51 @@ module ForestFire : RULE = struct
       { Cell.state = t |> to_cell_state
       ; Cell.pheno = t |> to_pheno
       }
-  end
 
-  let create () =
-    Random.int 3 |> State.of_int |> State.to_cell
+    let f = 0.000001  (* Probability of spontaneous ignition *)
+    let p = 0.1       (* Probability of spontaneous growth *)
 
-  let f = 0.000001  (* Probability of spontaneous ignition *)
-  let p = 0.1       (* Probability of spontaneous growth *)
+    let is_probable p =
+      (Random.float 1.0) <= p
 
-  let is_probable p =
-    (Random.float 1.0) <= p
+    let next t ~burning_neighbors =
+      match t, burning_neighbors with
+      | E, _ when is_probable p         -> T
+      | E, _                            -> E
+      | T, 0 when is_probable f         -> B
+      | T, _ when burning_neighbors > 0 -> B
+      | T, _                            -> T
+      | B, _                            -> E
+  end
 
-  let next state ~burning_neighbors =
-    match state, burning_neighbors with
-    | State.E, _ when is_probable p         -> State.T
-    | State.E, _                            -> State.E
-    | State.T, 0 when is_probable f         -> State.B
-    | State.T, _ when burning_neighbors > 0 -> State.B
-    | State.T, _                            -> State.T
-    | State.B, _                            -> State.E
+  let init =
+    State.random |- State.to_cell
 
-  let burning_neighbors neighbors =
-    neighbors |> List.map ~f:State.of_cell_state
-              |> List.filter ~f:State.is_burning
-              |> List.map ~f:State.to_int
-              |> List.fold_left ~init:0 ~f:(+)
+  let count_of_burning =
+       List.map    ~f:State.of_cell_state
+    |- List.filter ~f:State.is_burning
+    |- List.length
 
   let transition ~self ~neighbors =
     self |> State.of_cell_state
-         |> next ~burning_neighbors:(burning_neighbors neighbors)
+         |> State.next ~burning_neighbors:(count_of_burning neighbors)
          |> State.to_cell
 end
 
 
-module Automaton : sig
+module Automaton :
+sig
   type t
 
-  val create  : rows:int
+  val make  : rows:int
              -> columns:int
              -> interval:float
              -> rules: (module RULE) list
              -> t
 
   val loop : t -> unit
-end = struct
+end =
+struct
   type cell = { data : Cell.t
               ; rule : (module RULE)
               }
@@ -364,17 +381,17 @@ end = struct
            ; bar      : string
            }
 
-  let create ~rows:rs ~columns:ks ~interval ~rules =
+  let make ~rows:rs ~columns:ks ~interval ~rules =
     let n = List.length rules in
     let init () =
       let rule = List.nth_exn rules (Random.int n) in
       let module Rule = (val rule : RULE) in
       { rule
-      ; data = Rule.create ()
+      ; data = Rule.init ()
       }
     in
     Terminal.clear ();
-    { grid     = Matrix.map ~f:init (Matrix.create ~rs ~ks ())
+    { grid     = Matrix.map ~f:init (Matrix.make ~rs ~ks ())
     ; interval = Time.Span.of_float interval
     ; bar      = String.make ks '-'
     }
@@ -419,7 +436,7 @@ let main interval () =
     ; (module ForestFire : RULE)
     ]
   in
-  Automaton.loop (Automaton.create ~rows:(rows - 3) ~columns ~interval ~rules)
+  Automaton.loop (Automaton.make ~rows:(rows - 3) ~columns ~interval ~rules)
 
 
 let spec =