79 lines
3.1 KiB
OCaml
79 lines
3.1 KiB
OCaml
(***********************************************************************)
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(* *)
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(* Caml Special Light *)
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(* *)
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(* Daniel de Rauglaudre, projet Cristal, INRIA Rocquencourt *)
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(* *)
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(* Copyright 1995 Institut National de Recherche en Informatique et *)
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(* Automatique. Distributed only by permission. *)
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(* *)
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(***********************************************************************)
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(* $Id$ *)
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(* Module [Stream]: streams and stream parsers operations *)
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type 'a t
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(* The type of streams containing values of type ['a]. *)
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exception Parse_failure
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(* Raised by parsers when none of the first components of the stream
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patterns is accepted. *)
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exception Parse_error of string
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(* Raised by parsers when the first component of a stream pattern is
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accepted, but one of the following components is rejected. *)
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(** Stream builders *)
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(* Warning: these functions create streams with fast access; it is illegal
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to mix them with streams built with [[< >]]; would raise [Failure]
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when accessing such mixed streams. *)
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val from : (int -> 'a option) -> 'a t
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(* [Stream.from f] returns a stream built from the function [f].
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To create a new stream element, the function [f] is called with
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the current stream count. The user function [f] must return either
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[Some <value>] for a value or [None] to specify the end of the
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stream. *)
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val of_list : 'a list -> 'a t
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(* Return the stream holding the elements of the list in the same
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order. *)
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val of_string : string -> char t
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(* Return the stream of the characters of the string parameter. *)
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val of_channel : in_channel -> char t
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(* Return the stream of the characters read from the input channel. *)
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(** Stream iterator *)
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val iter : ('a -> 'b) -> 'a t -> unit
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(* [Stream.iter f s] scans the whole stream s, applying function [f]
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in turn to each stream element encountered. *)
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(** Predefined parsers *)
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val next : 'a t -> 'a
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(* Return the first element of the stream and remove it from the
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stream. Raise [Parse_failure] if the stream is empty. *)
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val empty : 'a t -> unit
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(* Return [()] if the stream is empty, else raise [Parse_failure]. *)
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(** Useful functions *)
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val peek : 'a t -> 'a option
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(* Return [Some] of "the first element" of the stream, or [None] if
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the stream is empty. *)
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val junk : 'a t -> unit
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(* Remove the first element of the stream, possibly unfreezing
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it before. *)
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val count : 'a t -> int
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(* Return the current count of the stream elements, i.e. the number
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of the stream elements discarded. *)
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(*--*)
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(*** For system use only, not for the casual user *)
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val sempty : 'a t
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val scons : (unit -> 'a) -> 'a t -> 'a t
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val sapp : (unit -> 'a t) -> 'a t -> 'a t
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val dump : ('a -> unit) -> 'a t -> unit
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