forked from GitHub/gf-core
58 lines
1.5 KiB
Plaintext
58 lines
1.5 KiB
Plaintext
import prelude
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import tree
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derive Eq Tree
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derive Compos Tree
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-- When the Transfer compiler gets meta variable inference,
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-- we can write:
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{-
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aggreg : (A : Type) -> Tree A -> Tree A
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aggreg _ t =
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case t of
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ConjS c s1 s2 ->
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case (aggreg ? s1, aggreg ? s2) of
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(Pred np1 vp1, Pred np2 vp2) | np1 == np2 ->
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Pred np1 (ConjVP c vp1 vp2)
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(Pred np1 vp1, Pred np2 vp2) | vp1 == vp2 ->
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Pred (ConjNP c np1 np2) vp1
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(s1',s2') -> ConjS c s1' s2'
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_ -> composOp ? ? ? ? aggreg t
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-}
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-- Adding hidden arguments, we could write something like:
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{-
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aggreg : (A : Type) => Tree A -> Tree A
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aggreg t =
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case t of
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ConjS c s1 s2 ->
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case (aggreg s1, aggreg s2) of
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(Pred np1 vp1, Pred np2 vp2) | np1 == np2 ->
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Pred np1 (ConjVP c vp1 vp2)
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(Pred np1 vp1, Pred np2 vp2) | vp1 == vp2 ->
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Pred (ConjNP c np1 np2) vp1
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(s1',s2') -> ConjS c s1' s2'
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_ -> composOp aggreg t
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-}
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-- For now, here's what we have to do:
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aggreg : (A : Type) -> Tree A -> Tree A
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aggreg _ t =
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case t of
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ConjS c s1 s2 ->
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case (aggreg ? s1, aggreg ? s2) of
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(Pred np1 vp1, Pred np2 vp2) | eq NP (eq_Tree NP) np1 np2 ->
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Pred np1 (ConjVP c vp1 vp2)
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(Pred np1 vp1, Pred np2 vp2) | eq VP (eq_Tree VP) vp1 vp2 ->
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Pred (ConjNP c np1 np2) vp1
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(s1',s2') -> ConjS c s1' s2'
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_ -> composOp ? ? compos_Tree ? aggreg t
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-- aggreg specialized for Tree S
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aggregS : Tree S -> Tree S
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aggregS = aggreg S
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