For those who like me are playing with the stream-enabled branch of
Clojure, there is a new module stream-utils on clojure.contrib:
http://code.google.com/p/clojure-contrib/source/browse/trunk/src/
clojure/contrib/stream-utils.clj
Obviously this is very experimental, and absolutely not ready for use
in applications. The module defines a couple of stream transformers
and tools for writing stream transformers. Any feedback is welcome!
As a result of writing this code, I have one modification request for
Clojure's stream support: it would be very convenient if iters were
callable, such that one could write (iter eos) instead of (next! iter
eos). This would make it possible to use iters directly as an
argument to stream.
Motivation: a stream transformer involves the steps:
stream -> iter -> (transformation) -> generator -> (transformation) -
> stream
Here "transformation" stands for a function that takes an iter/
generator and returns a new object of the same kind. There are two
possible places in this chain to insert a transformation function,
either at the iter level or at the generator level. I decided to
implement transformations at the generator level, but one could as
well do it at the iterator level. But in both cases, there is an
addition step iterator->generator that is required only because
iterators and generators have different calling interfaces, although
they have pretty much the same behaviour.
Konrad.
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