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reimplement stay-then-continue and continue-then-stay in terms of multi-path

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Nathan Marz 2016-01-22 19:45:20 -08:00
parent b98bc8e4ce
commit d56ea62e00
1 changed files with 12 additions and 25 deletions
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37
src/clj/com/rpl/specter.cljx
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@ -240,31 +240,6 @@
ancestry))
)))
(defn stay-then-continue
"Navigates to the current element and then navigates via the provided path.
This can be used to implement pre-order traversal."
[& path]
(fixed-pathed-path [late path]
(select* [this structure next-fn]
(concat (next-fn structure)
(doall (mapcat next-fn (compiled-select late structure)))))
(transform* [this structure next-fn]
(compiled-transform late next-fn (next-fn structure))
)))
(defn continue-then-stay
"Navigates to the provided path and then to the current element. This can be used
to implement post-order traversal."
[& path]
(fixed-pathed-path [late path]
(select* [this structure next-fn]
(concat (doall (mapcat next-fn (compiled-select late structure)))
(next-fn structure)))
(transform* [this structure next-fn]
(next-fn (compiled-transform late next-fn structure))
)))
(defpath keypath [key]
(select* [this structure next-fn]
(next-fn (get structure key)))
@ -445,3 +420,15 @@
structure
compiled-paths
))))
(defn stay-then-continue
"Navigates to the current element and then navigates via the provided path.
This can be used to implement pre-order traversal."
[& path]
(multi-path STAY path))
(defn continue-then-stay
"Navigates to the provided path and then to the current element. This can be used
to implement post-order traversal."
[& path]
(multi-path path STAY))