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Manual Reference Pages  -  STREAM (3)


Stream - Streams and parsers.




Module Stream


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 ===

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_bytes : bytes -> char t

Return the stream of the characters of the bytes parameter.

Since 4.02.0

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.

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OCamldoc STREAM (3) 2016-03-17

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