3 files changed, 129 insertions, 0 deletions
diff --git a/viz.js/promise/dune b/viz.js/promise/dune
new file mode 100755
index 0000000..e1ae25f
--- /dev/null
+++ b/viz.js/promise/dune
@@ -0,0 +1,7 @@
+(library
+ (name promise)
+ (libraries 
+   js_of_ocaml 
+   )
+ (preprocess (pps js_of_ocaml-ppx))
+ )
diff --git a/viz.js/promise/promise.ml b/viz.js/promise/promise.ml
new file mode 100755
index 0000000..f9f7e53
--- /dev/null
+++ b/viz.js/promise/promise.ml
@@ -0,0 +1,66 @@
+open Js_of_ocaml
+
+type ('a, 'b) promise
+
+type 'a resolve = 'a -> unit
+
+type 'a reject = 'a -> unit
+
+let promise_global = Js.Unsafe.global##._Promise
+
+let is_supported () = Js.Optdef.test promise_global
+
+let make f =
+  Js.Unsafe.new_obj promise_global [|Js.Unsafe.inject f|]
+
+let resolve value =
+  Js.Unsafe.fun_call promise_global##.resolve [|Js.Unsafe.inject value|]
+
+let reject value =
+  Js.Unsafe.fun_call promise_global##.reject [|Js.Unsafe.inject value|]
+
+let js_of_opt = function
+  | Some value -> Js.Unsafe.inject value
+  | None       -> Js.Unsafe.inject Js.undefined
+
+let then_bind ~on_fulfilled ?on_rejected promise =
+  Js.Unsafe.meth_call promise "then"
+    [|Js.Unsafe.inject on_fulfilled; js_of_opt on_rejected|]
+
+let then_map ~on_fulfilled ?on_rejected promise =
+  Js.Unsafe.meth_call promise "then"
+    [|Js.Unsafe.inject on_fulfilled; js_of_opt on_rejected|]
+
+let catch_bind ~on_rejected promise =
+  Js.Unsafe.meth_call promise "catch" [|Js.Unsafe.inject on_rejected|]
+
+let catch_map ~on_rejected promise =
+  Js.Unsafe.meth_call promise "catch" [|Js.Unsafe.inject on_rejected|]
+
+let then_final ~on_fulfilled ~on_rejected promise =
+  Js.Unsafe.meth_call promise "then"
+    [|Js.Unsafe.inject on_fulfilled; Js.Unsafe.inject on_rejected|]
+
+let all promises =
+  let intermediate_promise =
+    Js.Unsafe.fun_call promise_global##.all
+      [|Js.Unsafe.inject (Js.array promises)|]
+  in
+  then_map
+    ~on_fulfilled:(fun js_array -> Js.to_array js_array) intermediate_promise
+
+let race promises =
+  Js.Unsafe.fun_call promise_global##.race
+    [|Js.Unsafe.inject (Js.array promises)|]
+
+module Infix = struct
+  let (>>=) promise on_fulfilled = then_bind ~on_fulfilled promise
+  let (>|=) promise on_fulfilled = then_map  ~on_fulfilled promise
+
+  let (>>~) promise on_rejected = catch_bind ~on_rejected promise
+  let (>|~) promise on_rejected = catch_map  ~on_rejected promise
+
+  let (>||) promise (on_fulfilled, on_rejected) =
+    then_final ~on_fulfilled ~on_rejected promise
+end
+
diff --git a/viz.js/promise/promise.mli b/viz.js/promise/promise.mli
new file mode 100755
index 0000000..26831c4
--- /dev/null
+++ b/viz.js/promise/promise.mli
@@ -0,0 +1,56 @@
+type ('a, 'b) promise
+
+type 'a resolve = 'a -> unit
+
+type 'a reject = 'a -> unit
+
+val is_supported : unit -> bool
+
+val make : ('a resolve -> 'b reject -> unit) -> ('a, 'b) promise
+
+val resolve : 'a -> ('a, 'b) promise
+
+val reject : 'b -> ('a, 'b) promise
+
+val then_bind :
+  on_fulfilled:('a -> ('c ,'b) promise) ->
+  ?on_rejected:('b -> ('c, 'b) promise) ->
+  ('a, 'b) promise ->
+  ('c, 'b) promise
+
+val then_map :
+  on_fulfilled:('a -> 'c) ->
+  ?on_rejected:('b -> 'd) ->
+  ('a, 'b) promise ->
+  ('c, 'd) promise
+
+val catch_bind :
+  on_rejected:('b -> ('a, 'b) promise) ->
+  ('a, 'b) promise ->
+  ('a, 'b) promise
+
+val catch_map :
+  on_rejected:('b -> 'a) ->
+  ('a, 'b) promise ->
+  ('a, 'b) promise
+
+val then_final :
+  on_fulfilled:('a -> unit) ->
+  on_rejected:('b -> unit) ->
+  ('a, 'b) promise ->
+  unit
+
+val all : (('a, 'b) promise) array -> ('a array, 'b) promise
+
+val race : (('a, 'b) promise) array -> ('a, 'b) promise
+
+module Infix : sig
+  val (>>=) : ('a, 'b) promise -> ('a -> ('c ,'b) promise) -> ('c, 'b) promise
+  val (>|=) : ('a, 'b) promise -> ('a -> 'c) -> ('c, 'b) promise
+
+  val (>>~) : ('a, 'b) promise -> ('b -> ('a, 'b) promise) -> ('a, 'b) promise
+  val (>|~) : ('a, 'b) promise -> ('b -> 'a) -> ('a, 'b) promise
+
+  val (>||) : ('a, 'b) promise -> ('a -> unit) * ('b -> unit) -> unit
+end
+