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(* *)
(* OCaml *)
(* *)
(* Daniel de Rauglaudre, projet Cristal, INRIA Rocquencourt *)
(* *)
(* Copyright 1997 Institut National de Recherche en Informatique et *)
(* en Automatique. All rights reserved. This file is distributed *)
(* under the terms of the GNU Library General Public License, with *)
(* the special exception on linking described in file ../LICENSE. *)
(* *)
(***********************************************************************)
(** Streams and parsers. *)
type 'a t
(** The type of streams holding values of type ['a]. *)
exception Failure
(** Raised by parsers when none of the first components of the stream
patterns is accepted. *)
exception Error of string
(** Raised by parsers when the first component of a stream pattern is
accepted, but one of the following components is rejected. *)
(** {6 Stream builders} *)
val from : (int -> 'a option) -> 'a t
(** [Stream.from f] returns a stream built from the function [f].
To create a new stream element, the function [f] is called with
the current stream count. The user function [f] must return either
[Some <value>] for a value or [None] to specify the end of the
stream.
Do note that the indices passed to [f] may not start at [0] in the
general case. For example, [[< '0; '1; Stream.from f >]] would call
[f] the first time with count [2].
*)
val of_list : 'a list -> 'a t
(** Return the stream holding the elements of the list in the same
order. *)
val of_string : string -> char t
(** Return the stream of the characters of the string parameter. *)
val of_channel : in_channel -> char t
(** Return the stream of the characters read from the input channel. *)
(** {6 Stream iterator} *)
val iter : ('a -> unit) -> 'a t -> unit
(** [Stream.iter f s] scans the whole stream s, applying function [f]
in turn to each stream element encountered. *)
(** {6 Predefined parsers} *)
val next : 'a t -> 'a
(** Return the first element of the stream and remove it from the
stream. Raise Stream.Failure if the stream is empty. *)
val empty : 'a t -> unit
(** Return [()] if the stream is empty, else raise [Stream.Failure]. *)
(** {6 Useful functions} *)
val peek : 'a t -> 'a option
(** Return [Some] of "the first element" of the stream, or [None] if
the stream is empty. *)
val junk : 'a t -> unit
(** Remove the first element of the stream, possibly unfreezing
it before. *)
val count : 'a t -> int
(** Return the current count of the stream elements, i.e. the number
of the stream elements discarded. *)
val npeek : int -> 'a t -> 'a list
(** [npeek n] returns the list of the [n] first elements of
the stream, or all its remaining elements if less than [n]
elements are available. *)
(**/**)
(* The following is for system use only. Do not call directly. *)
val iapp : 'a t -> 'a t -> 'a t
val icons : 'a -> 'a t -> 'a t
val ising : 'a -> 'a t
val lapp : (unit -> 'a t) -> 'a t -> 'a t
val lcons : (unit -> 'a) -> 'a t -> 'a t
val lsing : (unit -> 'a) -> 'a t
val sempty : 'a t
val slazy : (unit -> 'a t) -> 'a t
val dump : ('a -> unit) -> 'a t -> unit
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