reflex-0.8.2.1: Higher-order Functional Reactive Programming
Safe HaskellNone
LanguageHaskell2010

Reflex.Query.Class

Description

 
Synopsis

Documentation

class (Monoid (QueryResult a), Semigroup (QueryResult a)) => Query a where Source #

A Query can be thought of as a declaration of interest in some set of data. A QueryResult is the set of data associated with that interest set. The crop function provides a way to determine what part of a given QueryResult is relevant to a given Query.

Associated Types

type QueryResult a :: Type Source #

Methods

crop :: a -> QueryResult a -> QueryResult a Source #

Instances

Instances details
Query () Source #

Trivial queries have trivial results.

Instance details

Defined in Reflex.Query.Class

Associated Types

type QueryResult () Source #

Methods

crop :: () -> QueryResult () -> QueryResult () Source #

Query Void Source #

The result of an absurd query is trivial; If you can ask the question, the answer cannot tell you anything you didn't already know.

'QueryResult Void = Void' seems like it would also work, but that has problems of robustness. In some applications, an unasked question can still be answered, so it is important that the result is inhabited even when the question isn't. Applications that wish to prevent this can mandate that the query result be paired with the query: then the whole response will be uninhabited as desired.

Instance details

Defined in Reflex.Query.Class

Associated Types

type QueryResult Void Source #

(Query a, Query b) => Query (a, b) Source #

the result of two queries is both results.

Instance details

Defined in Reflex.Query.Class

Associated Types

type QueryResult (a, b) Source #

Methods

crop :: (a, b) -> QueryResult (a, b) -> QueryResult (a, b) Source #

(Ord k, Query v) => Query (MonoidalMap k v) Source # 
Instance details

Defined in Reflex.Query.Class

Associated Types

type QueryResult (MonoidalMap k v) Source #

(Query q, Applicative f) => Query (Ap f q) Source #

We can lift queries into monoidal containers. But beware of Applicatives whose monoid is different from (pure mempty, liftA2 mappend)

Instance details

Defined in Reflex.Query.Class

Associated Types

type QueryResult (Ap f q) Source #

Methods

crop :: Ap f q -> QueryResult (Ap f q) -> QueryResult (Ap f q) Source #

data QueryMorphism q q' Source #

QueryMorphism's must be group homomorphisms when acting on the query type and compatible with the query relationship when acting on the query result.

Instances

Instances details
Category QueryMorphism Source # 
Instance details

Defined in Reflex.Query.Class

Methods

id :: forall (a :: k). QueryMorphism a a #

(.) :: forall (b :: k) (c :: k) (a :: k). QueryMorphism b c -> QueryMorphism a b -> QueryMorphism a c #

newtype SelectedCount Source #

This type can be used to track of the frequency of interest in a given Query. See note on combineSelectedCounts

Constructors

SelectedCount 

Fields

Instances

Instances details
Bounded SelectedCount Source # 
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Defined in Reflex.Query.Class

Enum SelectedCount Source # 
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Eq SelectedCount Source # 
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Integral SelectedCount Source # 
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Data SelectedCount Source # 
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Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> SelectedCount -> c SelectedCount #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c SelectedCount #

toConstr :: SelectedCount -> Constr #

dataTypeOf :: SelectedCount -> DataType #

dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c SelectedCount) #

dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c SelectedCount) #

gmapT :: (forall b. Data b => b -> b) -> SelectedCount -> SelectedCount #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> SelectedCount -> r #

gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> SelectedCount -> r #

gmapQ :: (forall d. Data d => d -> u) -> SelectedCount -> [u] #

gmapQi :: Int -> (forall d. Data d => d -> u) -> SelectedCount -> u #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> SelectedCount -> m SelectedCount #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> SelectedCount -> m SelectedCount #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> SelectedCount -> m SelectedCount #

Num SelectedCount Source # 
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Defined in Reflex.Query.Class

Ord SelectedCount Source # 
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Defined in Reflex.Query.Class

Read SelectedCount Source # 
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Defined in Reflex.Query.Class

Real SelectedCount Source # 
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Show SelectedCount Source # 
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Ix SelectedCount Source # 
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Semigroup SelectedCount Source # 
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Monoid SelectedCount Source # 
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Storable SelectedCount Source # 
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Bits SelectedCount Source # 
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FiniteBits SelectedCount Source # 
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Commutative SelectedCount Source # 
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Group SelectedCount Source # 
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Defined in Reflex.Query.Class

combineSelectedCounts :: SelectedCount -> SelectedCount -> Maybe SelectedCount Source #

The Semigroup/Monoid/Group instances for a Query containing SelectedCounts should use this function which returns Nothing if the result is 0. This allows the pruning of leaves of the Query that are no longer wanted.

class (Group q, Commutative q, Query q, Monad m) => MonadQuery t q m | m -> q t where Source #

A class that allows sending of Querys and retrieval of QueryResults. See queryDyn for a commonly used interface.

Instances

Instances details
MonadQuery t q m => MonadQuery t q (ReaderT r m) Source # 
Instance details

Defined in Reflex.Query.Class

(MonadQuery t q m, Monad m) => MonadQuery t q (EventWriterT t w m) Source # 
Instance details

Defined in Reflex.EventWriter.Base

(Monad m, Group q, Commutative q, Query q, Reflex t) => MonadQuery t q (QueryT t q m) Source # 
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Defined in Reflex.Query.Base

(MonadQuery t q m, Monad m) => MonadQuery t q (DynamicWriterT t w m) Source # 
Instance details

Defined in Reflex.DynamicWriter.Base

(MonadQuery t q m, Monad m) => MonadQuery t q (BehaviorWriterT t w m) Source # 
Instance details

Defined in Reflex.BehaviorWriter.Base

MonadQuery t q m => MonadQuery (ProfiledTimeline t) q (ProfiledM m) Source # 
Instance details

Defined in Reflex.Profiled

tellQueryDyn :: (Reflex t, MonadQuery t q m) => Dynamic t q -> m () Source #

Produce and send an Incremental Query from a Dynamic Query.

queryDyn :: (Reflex t, MonadQuery t q m) => Dynamic t q -> m (Dynamic t (QueryResult q)) Source #

Retrieve Dynamically updating QueryResults for a Dynamically updating Query.

subQuery :: (Reflex t, MonadQuery t q2 m) => QueryMorphism q1 q2 -> Dynamic t q1 -> m (Dynamic t (QueryResult q1)) Source #

Use a query morphism to operate on a smaller version of a query.

mapQuery :: QueryMorphism q q' -> q -> q' Source #

Apply a QueryMorphism to a Query