Module Stream: 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 : 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 = "%field0";;
-
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.