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Define eliminators for TermF.

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This commit is contained in:
Rob Rix 2017-11-23 13:14:46 -05:00
parent d17b6399f2
commit 89338a8570
1 changed files with 9 additions and 0 deletions
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9
src/Data/Term.hs
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@ -3,6 +3,8 @@ module Data.Term
( Term(..)
, termIn
, TermF(..)
, termFAnnotation
, termFOut
, termSize
, extract
, unwrap
@ -31,6 +33,13 @@ data TermF syntax ann recur = In { termAnnotation :: ann, termOut :: syntax recu
deriving (Eq, Foldable, Functor, Show, Traversable)
termFAnnotation :: TermF syntax ann recur -> ann
termFAnnotation (In ann _) = ann
termFOut :: TermF syntax ann recur -> syntax recur
termFOut (In _ out) = out
-- | Return the node count of a term.
termSize :: (Foldable f, Functor f) => Term f annotation -> Int
termSize = cata size where