I wrote a function for this in laser. https://github.com/Raynes/laser/blob/e351444a09e5c81b900767e955edf62558c33fd6/src/me/raynes/laser/zip.clj#L38
(defn zipper? "Checks to see if the object has zip/make-node metadata on it (confirming it to be a zipper." [obj] (contains? (meta obj) :zip/make-node)) This is all you really need to do. Someone would have to go really out of their way to fake this, and if they do that then they probably did it on purpose and you shouldn't worry about it. On Tuesday, June 11, 2013 2:20:38 PM UTC-7, Stefan Kamphausen wrote: > > Hi, > > > while working on some XML data extraction I got an NPE which boiled down > to calling some zipper related functions on an empty vector or nil. > > I didn't find a function in clojure.zip, clojure.data.zip or > clojure.data.zip.xml to test if an object passed to a function is actually > a zipper. Am I missing something obvious? How would you test this? I > could try to call clojure.zip/node and catch the exception, but maybe there > is a better aproach. > > > Kind regards, > stefan > -- -- 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. For more options, visit https://groups.google.com/groups/opt_out.
