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Extract the annotation of Free terms.

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Rob Rix 2015-11-27 11:46:12 -05:00
parent b814e3c068
commit f4c73cb3f7
1 changed files with 2 additions and 0 deletions
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src/Interpreter.hs
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@ -44,6 +44,8 @@ run comparable (Free (Recursive (annotation1 :< a) (annotation2 :< b) f)) = run
maybeInterpret _ _ = error "maybeInterpret assumes that its operands are `Just`s."
recur _ _ = Pure $ Replace (annotation1 :< a) (annotation2 :< b)
annotate = Free . Annotated (annotation1, annotation2)
run comparable (Free (ByKey a b f)) = run comparable $ f byKey where
byKey = unions [ deleted, inserted, patched ]
deleted = (Pure . Delete) <$> difference a b