Copyright	(c) Edward Kmett 2009
License	BSD-style
Maintainer	ekmett@gmail.com
Stability	experimental
Portability	non-portable (type families, MPTCs)
Safe Haskell	Safe
Language	Haskell98

Data.Generator.Combinators

Contents

Monadic Reduction
Applicative Reduction
Logical Reduction
Monoidal Reduction
List-Like Reduction

Description

Utilities for working with Monoids that conflict with names from the Prelude, Data.Foldable, Control.Monad or elsewhere. Intended to be imported qualified.

import Data.Generator.Combinators as Generator

Synopsis

mapM_ :: (Generator c, Monad m) => (Elem c -> m b) -> c -> m ()
forM_ :: (Generator c, Monad m) => c -> (Elem c -> m b) -> m ()
msum :: (Generator c, MonadPlus m, m a ~ Elem c) => c -> m a
traverse_ :: (Generator c, Applicative f) => (Elem c -> f b) -> c -> f ()
for_ :: (Generator c, Applicative f) => c -> (Elem c -> f b) -> f ()
asum :: (Generator c, Alternative f, f a ~ Elem c) => c -> f a
and :: (Generator c, Elem c ~ Bool) => c -> Bool
or :: (Generator c, Elem c ~ Bool) => c -> Bool
any :: Generator c => (Elem c -> Bool) -> c -> Bool
all :: Generator c => (Elem c -> Bool) -> c -> Bool
foldMap :: (Monoid m, Generator c) => (Elem c -> m) -> c -> m
fold :: (Monoid m, Generator c, Elem c ~ m) => c -> m
toList :: Generator c => c -> [Elem c]
concatMap :: Generator c => (Elem c -> [b]) -> c -> [b]
elem :: (Generator c, Eq (Elem c)) => Elem c -> c -> Bool
filter :: (Generator c, Reducer (Elem c) m, Monoid m) => (Elem c -> Bool) -> c -> m
filterWith :: (Generator c, Reducer (Elem c) m, Monoid m) => (m -> n) -> (Elem c -> Bool) -> c -> n
sum :: (Generator c, Num (Elem c)) => c -> Elem c
product :: (Generator c, Num (Elem c)) => c -> Elem c
notElem :: (Generator c, Eq (Elem c)) => Elem c -> c -> Bool

Monadic Reduction

mapM_ :: (Generator c, Monad m) => (Elem c -> m b) -> c -> m () Source #

Efficiently mapReduce a Generator using the Action monoid. A specialized version of its namesake from Data.Foldable and Control.Monad

   mapReduceWith getAction

forM_ :: (Generator c, Monad m) => c -> (Elem c -> m b) -> m () Source #

Convenience function as found in Data.Foldable and Control.Monad

    flip mapM_

msum :: (Generator c, MonadPlus m, m a ~ Elem c) => c -> m a Source #

The sum of a collection of actions, generalizing concat

    reduceWith getMonadSum

Applicative Reduction

traverse_ :: (Generator c, Applicative f) => (Elem c -> f b) -> c -> f () Source #

Efficiently mapReduce a Generator using the Traversal monoid. A specialized version of its namesake from Data.Foldable

    mapReduce getTraversal

for_ :: (Generator c, Applicative f) => c -> (Elem c -> f b) -> f () Source #

Convenience function as found in Data.Foldable

    flip traverse_

asum :: (Generator c, Alternative f, f a ~ Elem c) => c -> f a Source #

The sum of a collection of actions, generalizing concat

   reduceWith getAlt

Logical Reduction

and :: (Generator c, Elem c ~ Bool) => c -> Bool Source #

Efficiently reduce a Generator that contains values of type Bool

    reduceWith getAll

or :: (Generator c, Elem c ~ Bool) => c -> Bool Source #

Efficiently reduce a Generator that contains values of type Bool

    reduceWith getAny

any :: Generator c => (Elem c -> Bool) -> c -> Bool Source #

Efficiently mapReduce any Generator checking to see if any of its values match the supplied predicate

    mapReduceWith getAny

all :: Generator c => (Elem c -> Bool) -> c -> Bool Source #

Efficiently mapReduce any Generator checking to see if all of its values match the supplied predicate

    mapReduceWith getAll

Monoidal Reduction

foldMap :: (Monoid m, Generator c) => (Elem c -> m) -> c -> m Source #

Efficiently mapReduce a Generator using the WrappedMonoid monoid. A specialized version of its namesake from Data.Foldable

    mapReduceWith unwrapMonoid

fold :: (Monoid m, Generator c, Elem c ~ m) => c -> m Source #

Efficiently reduce a Generator using the WrappedMonoid monoid. A specialized version of its namesake from Data.Foldable

    reduceWith unwrapMonoid

toList :: Generator c => c -> [Elem c] Source #

Convert any Generator to a list of its contents. Specialization of reduce

List-Like Reduction

concatMap :: Generator c => (Elem c -> [b]) -> c -> [b] Source #

Type specialization of "foldMap" above

elem :: (Generator c, Eq (Elem c)) => Elem c -> c -> Bool Source #

Check to see if any member of the Generator matches the supplied value

filter :: (Generator c, Reducer (Elem c) m, Monoid m) => (Elem c -> Bool) -> c -> m Source #

Efficiently mapReduce a subset of the elements in a Generator

filterWith :: (Generator c, Reducer (Elem c) m, Monoid m) => (m -> n) -> (Elem c -> Bool) -> c -> n Source #

Allows idiomatic specialization of filter by proving a function that will be used to transform the output

sum :: (Generator c, Num (Elem c)) => c -> Elem c Source #

Efficiently sum over the members of any Generator

    reduceWith getSum

product :: (Generator c, Num (Elem c)) => c -> Elem c Source #

Efficiently take the product of every member of a Generator

    reduceWith getProduct

notElem :: (Generator c, Eq (Elem c)) => Elem c -> c -> Bool Source #

Check to make sure that the supplied value is not a member of the Generator