> 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. >>> > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with your > first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > --- > You received this message because you are subscribed to the Google Groups > "Clojure" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to clojure+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/clojure/ab820e20-75ad-4852-aa01-9321cb7487b4n%40googlegroups.com. -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/clojure/CAGokn9%2BGw2oZBfMNMGKPVko7gOUDMJMNuz3dEr45vdx%2BuEUgrA%40mail.gmail.com.
