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| Data.Generics.Schemes | | Portability | non-portable (local universal quantification) | | Stability | experimental | | Maintainer | libraries@haskell.org |
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| Description |
| "Scrap your boilerplate" --- Generic programming in Haskell
See http://www.cs.vu.nl/boilerplate/. The present module provides
frequently used generic traversal schemes.
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| Synopsis |
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| Documentation |
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| everywhere :: (forall a . Data a => a -> a) -> forall a . Data a => a -> a |
| Apply a transformation everywhere in bottom-up manner
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| everywhere' :: (forall a . Data a => a -> a) -> forall a . Data a => a -> a |
| Apply a transformation everywhere in top-down manner
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| everywhereBut :: GenericQ Bool -> GenericT -> GenericT |
| Variation on everywhere with an extra stop condition
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| everywhereM :: Monad m => GenericM m -> GenericM m |
| Monadic variation on everywhere
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| somewhere :: MonadPlus m => GenericM m -> GenericM m |
| Apply a monadic transformation at least somewhere
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| everything :: (r -> r -> r) -> GenericQ r -> GenericQ r |
| Summarise all nodes in top-down, left-to-right order
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| listify :: Typeable r => (r -> Bool) -> GenericQ [r] |
| Get a list of all entities that meet a predicate
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| something :: GenericQ (Maybe u) -> GenericQ (Maybe u) |
| Look up a subterm by means of a maybe-typed filter
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| synthesize :: s -> (t -> s -> s) -> GenericQ (s -> t) -> GenericQ t |
| Bottom-up synthesis of a data structure;
1st argument z is the initial element for the synthesis;
2nd argument o is for reduction of results from subterms;
3rd argument f updates the synthesised data according to the given term
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| gsize :: Data a => a -> Int |
| Compute size of an arbitrary data structure
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| glength :: GenericQ Int |
| Count the number of immediate subterms of the given term
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| gdepth :: GenericQ Int |
| Determine depth of the given term
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| gcount :: GenericQ Bool -> GenericQ Int |
| Determine the number of all suitable nodes in a given term
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| gnodecount :: GenericQ Int |
| Determine the number of all nodes in a given term
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| gtypecount :: Typeable a => a -> GenericQ Int |
| Determine the number of nodes of a given type in a given term
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| gfindtype :: (Data x, Typeable y) => x -> Maybe y |
| Find (unambiguously) an immediate subterm of a given type
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| Produced by Haddock version 0.8 |
