Module Stream

module Stream: sig .. end
Streams and parsers.

type t('a);
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(string);
Raised by parsers when the first component of a stream pattern is accepted, but one of the following components is rejected.

Stream builders

let from: (int => option('a)) => t('a);
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.

let of_list: list('a) => t('a);
Return the stream holding the elements of the list in the same order.
let of_string: string => t(char);
Return the stream of the characters of the string parameter.
let of_bytes: bytes => t(char);
Return the stream of the characters of the bytes parameter.
Since 4.02.0
let of_channel: Pervasives.in_channel => t(char);
Return the stream of the characters read from the input channel.

Stream iterator

let iter: ('a => unit, t('a)) => unit;
Stream.iter f s scans the whole stream s, applying function f in turn to each stream element encountered.

Predefined parsers

let next: t('a) => 'a;
Return the first element of the stream and remove it from the stream. Raise Stream.Failure if the stream is empty.
let empty: t('a) => unit;
Return () if the stream is empty, else raise Stream.Failure.

Useful functions

let peek: t('a) => option('a);
Return Some of "the first element" of the stream, or None if the stream is empty.
let junk: t('a) => unit;
Remove the first element of the stream, possibly unfreezing it before.
let count: t('a) => int;
Return the current count of the stream elements, i.e. the number of the stream elements discarded.
let npeek: (int, t('a)) => list('a);
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.