Oh,
I defined my zipper as:
(def loz (z/zipper #(contains? % "children") #(get % "children") (fn [_ x
] x) {"children" z}))
But is throwing an exception.
This one works:
(def loz (z/zipper #(get % "children") #(get % "children") (fn [_ x ] x)
{"children" z}))
On Monday, August 24, 2015 at 4:08:17 PM UTC+2, Moe Aboulkheir wrote:
>
> Went off half-cocked there. The remainder:
>
> (edit-parents
> #(= 10 (get-in % ["a" "b"]))
> #(update % "children" reverse),
> data-zipper)
>
> Would have the effect of reversing the order of the children in each node
> which possesses a child having a "b" attribute set to 10. You could
> probably express this much better with a library which allows locations in
> data structures to be described in an XPath-like way (and your data
> actually looks a lot like it is the result of parsing markup - see
> clojure.data.xml and xml-zip if so) -- or there's probably some better
> zipper approach that somebody who's really into zippers could come up with.
>
> If you don't want to depend on an external library, and you lose your
> enthusiasm for zippers, you could write a function which goes over the
> structure and returns pairs of [[path] attributes], where path is a
> sequence of keys/indices suitable for passing to update-in/assoc-in etc.,
> and attributes is the value of the "a" key at each level.
>
> In general, if there aren't multiple keys similar to "a" in each map (i.e.
> it's always some value pointing to some map, and the value is not always
> "a"), this kind of layout may be easier (e.g. to destructure)
>
> {:tag "a" :attrs {:b 10} :children [...]}}
>
> Take care,
> Moe
>
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