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lwt_react.mli
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lwt_react.mli
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(* This file is part of Lwt, released under the MIT license. See LICENSE.md for
details, or visit https://github.com/ocsigen/lwt/blob/master/LICENSE.md. *)
(** React utilities *)
(** This module is an overlay for the [React] module. You can open it
instead of the [React] module in order to get all of [React]'s functions
plus Lwt ones.
This module is provided by OPAM package [lwt_react]. Link with ocamlfind
package [lwt_react]. *)
type 'a event = 'a React.event
(** Type of events. *)
type 'a signal = 'a React.signal
(** Type of signals. *)
module E : sig
include module type of React.E
(** {2 Lwt-specific utilities} *)
val with_finaliser : (unit -> unit) -> 'a event -> 'a event
(** [with_finaliser f e] returns an event [e'] which behave as
[e], except that [f] is called when [e'] is garbage
collected. *)
val next : 'a event -> 'a Lwt.t
(** [next e] returns the next occurrence of [e].
Avoid trying to create an "asynchronous loop" by calling [next e] again in
a callback attached to the promise returned by [next e]:
- The callback is called within the React update step, so calling [next e]
within it will return a promise that is fulfilled with the same value as
the current occurrence.
- If you instead arrange for the React update step to end (for example, by
calling [Lwt.pause ()] within the callback), multiple React update steps
may occur before the callback calls [next e] again, so some occurrences
can be effectively "lost."
To robustly asynchronously process occurrences of [e] in a loop, use
[to_stream e], and repeatedly call {!Lwt_stream.next} on the resulting
stream. *)
val limit : (unit -> unit Lwt.t) -> 'a event -> 'a event
(** [limit f e] limits the rate of [e] with [f].
For example, to limit the rate of an event to 1 per second you
can use: [limit (fun () -> Lwt_unix.sleep 1.0) event]. *)
val from : (unit -> 'a Lwt.t) -> 'a event
(** [from f] creates an event which occurs each time [f ()]
returns a value. If [f] raises an exception, the event is just
stopped. *)
val to_stream : 'a event -> 'a Lwt_stream.t
(** Creates a stream holding all values occurring on the given
event *)
val of_stream : 'a Lwt_stream.t -> 'a event
(** [of_stream stream] creates an event which occurs each time a
value is available on the stream.
If updating the event causes an exception at any point during the update
step, the excpetion is passed to [!]{!Lwt.async_exception_hook}, which
terminates the process by default. *)
val delay : 'a event Lwt.t -> 'a event
(** [delay promise] is an event which does not occur until
[promise] resolves. Then it behaves as the event returned by
[promise]. *)
val keep : 'a event -> unit
(** [keep e] keeps a reference to [e] so it will never be garbage
collected. *)
(** {2 Threaded versions of React transformation functions} *)
(** The following functions behave as their [React] counterpart,
except that they take functions that may yield.
As usual the [_s] suffix is used when calls are serialized, and
the [_p] suffix is used when they are not.
Note that [*_p] functions may not preserve event order. *)
val app_s : ('a -> 'b Lwt.t) event -> 'a event -> 'b event
val app_p : ('a -> 'b Lwt.t) event -> 'a event -> 'b event
val map_s : ('a -> 'b Lwt.t) -> 'a event -> 'b event
val map_p: ('a -> 'b Lwt.t) -> 'a event -> 'b event
val filter_s : ('a -> bool Lwt.t) -> 'a event -> 'a event
val filter_p : ('a -> bool Lwt.t) -> 'a event -> 'a event
val fmap_s : ('a -> 'b option Lwt.t) -> 'a event -> 'b event
val fmap_p : ('a -> 'b option Lwt.t) -> 'a event -> 'b event
val diff_s : ('a -> 'a -> 'b Lwt.t) -> 'a event -> 'b event
val accum_s : ('a -> 'a Lwt.t) event -> 'a -> 'a event
val fold_s : ('a -> 'b -> 'a Lwt.t) -> 'a -> 'b event -> 'a event
val merge_s : ('a -> 'b -> 'a Lwt.t) -> 'a -> 'b event list -> 'a event
val run_s : 'a Lwt.t event -> 'a event
val run_p : 'a Lwt.t event -> 'a event
end
module S : sig
include module type of React.S
(** {2 Monadic interface} *)
val return : 'a -> 'a signal
(** Same as [const]. *)
val bind : ?eq : ('b -> 'b -> bool) -> 'a signal -> ('a -> 'b signal) -> 'b signal
(** [bind ?eq s f] is initially [f x] where [x] is the current
value of [s]. Each time [s] changes to a new value [y], [bind
signal f] is set to [f y], until the next change of
[signal]. *)
val bind_s : ?eq : ('b -> 'b -> bool) -> 'a signal -> ('a -> 'b signal Lwt.t) -> 'b signal Lwt.t
(** Same as {!bind} except that [f] returns a promise. Calls to [f]
are serialized. *)
(** {2 Lwt-specific utilities} *)
val with_finaliser : (unit -> unit) -> 'a signal -> 'a signal
(** [with_finaliser f s] returns a signal [s'] which behaves as
[s], except that [f] is called when [s'] is garbage
collected. *)
val limit : ?eq : ('a -> 'a -> bool) -> (unit -> unit Lwt.t) -> 'a signal -> 'a signal
(** [limit f s] limits the rate of [s] update with [f].
For example, to limit it to 1 per second, you can use: [limit
(fun () -> Lwt_unix.sleep 1.0) s]. *)
val keep : 'a signal -> unit
(** [keep s] keeps a reference to [s] so it will never be garbage
collected. *)
(** {2 Threaded versions of React transformation functions} *)
(** The following functions behave as their [React] counterpart,
except that they take functions that may yield.
The [_s] suffix means that calls are serialized.
*)
val app_s : ?eq : ('b -> 'b -> bool) -> ('a -> 'b Lwt.t) signal -> 'a signal -> 'b signal Lwt.t
val map_s : ?eq : ('b -> 'b -> bool) -> ('a -> 'b Lwt.t) -> 'a signal -> 'b signal Lwt.t
val filter_s : ?eq : ('a -> 'a -> bool) -> ('a -> bool Lwt.t) -> 'a -> 'a signal -> 'a signal Lwt.t
val fmap_s : ?eq:('b -> 'b -> bool) -> ('a -> 'b option Lwt.t) -> 'b -> 'a signal -> 'b signal Lwt.t
val diff_s : ('a -> 'a -> 'b Lwt.t) -> 'a signal -> 'b event
val sample_s : ('b -> 'a -> 'c Lwt.t) -> 'b event -> 'a signal -> 'c event
val accum_s : ?eq : ('a -> 'a -> bool) -> ('a -> 'a Lwt.t) event -> 'a -> 'a signal
val fold_s : ?eq : ('a -> 'a -> bool) -> ('a -> 'b -> 'a Lwt.t) -> 'a -> 'b event -> 'a signal
val merge_s : ?eq : ('a -> 'a -> bool) -> ('a -> 'b -> 'a Lwt.t) -> 'a -> 'b signal list -> 'a signal Lwt.t
val l1_s : ?eq : ('b -> 'b -> bool) -> ('a -> 'b Lwt.t) -> 'a signal -> 'b signal Lwt.t
val l2_s : ?eq : ('c -> 'c -> bool) -> ('a -> 'b -> 'c Lwt.t) -> 'a signal -> 'b signal -> 'c signal Lwt.t
val l3_s : ?eq : ('d -> 'd -> bool) -> ('a -> 'b -> 'c -> 'd Lwt.t) -> 'a signal -> 'b signal -> 'c signal -> 'd signal Lwt.t
val l4_s : ?eq : ('e -> 'e -> bool) -> ('a -> 'b -> 'c -> 'd -> 'e Lwt.t) -> 'a signal -> 'b signal -> 'c signal -> 'd signal -> 'e signal Lwt.t
val l5_s : ?eq : ('f -> 'f -> bool) -> ('a -> 'b -> 'c -> 'd -> 'e -> 'f Lwt.t) -> 'a signal -> 'b signal -> 'c signal -> 'd signal -> 'e signal -> 'f signal Lwt.t
val l6_s : ?eq : ('g -> 'g -> bool) -> ('a -> 'b -> 'c -> 'd -> 'e -> 'f -> 'g Lwt.t) -> 'a signal -> 'b signal -> 'c signal -> 'd signal -> 'e signal -> 'f signal -> 'g signal Lwt.t
val run_s : ?eq : ('a -> 'a -> bool) -> 'a Lwt.t signal -> 'a signal Lwt.t
end
(**/**)
val opaque_identity : 'a -> 'a