Salut Laurent,
that's a good remark. Collecting and exporting of constants were conflated
in the previous version. So I added another API call: exported-constants.
Usually this are just the ones collected from the child nodes. But for ::fn
it's always empty.
; From your other mail
(defn processor
[pre post]
(fn this [form]
(let [form (pre form)
form (maybe recursive? update-children form this)]
(post form))))
(defmulti exported-constants :op)
(defmethod exported-constants :default
[form]
(:constants form))
(defmethod exported-constants ::fn
[_]
#{})
(defmulti collect-constants :op)
(defmethod collect-constants :default
[form]
form)
(defmethod collect-constants ::constant
[form]
(assoc form :constants #{(:form form)}))
(defmethod collect-constants ::recursive
[{:as form :keys [children]}]
(->> children
(map exported-constants)
(reduce into #{})
(assoc form :constants)))
((processor set-unbox collect-constants) {:op ::fn :children [{:op ::let
:children [{:op ::constant :form 1} {:op ::fn :children [{:op ::constant
:form 2}]}]}]})
; => {:constants #{1}, :op :user/fn, :children ({:constants #{1}, :unbox
false, :op :user/let, :children ({:constants #{1}, :unbox true, :op
:user/constant, :form 1} {:constants #{2}, :unbox true, :op :user/fn,
:children ({:constants #{2}, :unbox true, :op :user/constant, :form 2})})})}
Note how the nested ::fn collects constants from its children but doesn't
export it to its parent without the need of a filter on parent level.
Never ask such things on the list; a discussion about simplified examples
may arise. ;) But hopefully the discussion is helpful for Aaron in his
endeavour.
Meikel
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