Stream(3)

NAME
Stream - Streams and parsers.

Module
Module Stream

Documentation

Module Stream
 : sig end

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.

=== Stream builders Warning: these functions create streams with fast access; it is illegal to mix them with streams built with [< >]; would raise Failure when accessing such mixed streams. ===

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.

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 : Pervasives.in_channel -> char t

Return the stream of the characters read from the input channel.

=== 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.

=== 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 .

=== 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.