hit send too soon --
also, that print-method doesn't catch all lazy values
user=> (instance? clojure.lang.LazySeq (range))
false
user=> (supers (class (range)))
#{java.lang.Iterable java.util.List clojure.lang.Obj
clojure.lang.IPending java.io.Serializable clojure.lang.IHashEq
java.util.Collection clojure.lang.IObj clojure.lang.Sequential
clojure.lang.Seqable clojure.lang.IPersistentCollection
clojure.lang.ASeq clojure.lang.IReduce java.lang.Object
clojure.lang.ISeq clojure.lang.IMeta clojure.lang.IReduceInit}
On Mon, Nov 2, 2020 at 12:36 PM Justin Smith <noisesm...@gmail.com> wrote:
>
> > The next step might be to investigate why infinite lazy seqs don't print as
> > clojure.lang.LazySeq, like the finite ones.
>
> that printing of "clojure.lang.LazySeq@c5d38b66" relies on completely
> realizing the input, as it relies on the hash, which relies on the
> fully realized value
>
> On Mon, Nov 2, 2020 at 12:32 PM Austin Haas <aus...@pettomato.com> wrote:
> >
> > Thanks, Juan.
> >
> > I don't need to know the length of the seq, though, only that it is lazy. I
> > don't want to realize any lazy seqs. Ideally, I'd like to be able to print
> > any data structure and have all lazy seqs print just like it does in the
> > example I gave above (i.e., "clojure.lang.LazySeq@c5d38b66"), whether it is
> > finite or infinite.
> >
> > I also don't want to walk through every data structure to check if it
> > contains a lazy seq, but maybe that is the only option.
> >
> > I've also tried:
> >
> > (defmethod print-method clojure.lang.LazySeq [q, w]
> > (.write w "#clojure.lang.LazySeq"))
> >
> > The next step might be to investigate why infinite lazy seqs don't print as
> > clojure.lang.LazySeq, like the finite ones.
> > On Monday, November 2, 2020 at 9:22:58 AM UTC-8 jpmon...@gmail.com wrote:
> >>
> >> Hi Austin,
> >>
> >> Since there is no way to know the length of a lazy-seq without realizing
> >> it, I think your only choice is to set a limit on it by binding
> >> *print-length* if you are not sure about the sequence.
> >>
> >> Other thing you can try is bounded-count like this :
> >>
> >> (defn looks-finite? [xs]
> >> (let [limit 1000]
> >> (< (bounded-count limit xs) limit)))
> >>
> >> (looks-finite? (map inc (range))) ;; => false
> >> (looks-finite? (map inc (range 100))) ;; => true
> >>
> >> I hope that helps.
> >>
> >> Juan
> >> El domingo, 1 de noviembre de 2020 a las 20:06:39 UTC-3, Austin Haas
> >> escribió:
> >>>
> >>>
> >>> How can I make sure that a logging function won't try to realize an
> >>> infinite lazy seq that could be anywhere in the arguments passed to the
> >>> logging function?
> >>>
> >>> Is there some way to guarantee that lazy seqs won't be realized when
> >>> converting to a string?
> >>>
> >>> I know I can bind *print-length*, but I don't want to constrain every
> >>> collection.
> >>>
> >>> And I know that lazy seqs aren't always realized, but that doesn't seem
> >>> to help if they are infinite:
> >>>
> >>> user=> (str (map inc (range 10)))
> >>> "clojure.lang.LazySeq@c5d38b66"
> >>>
> >>> user=> (str (map inc (range)))
> >>> <never ends>
> >>>
> >>> Thanks.
> >>>
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