Text.XML.PolySoup.Predicate

A generic extracting predicate.

Documentation

newtype Q a b

A predicate checks if the given element satisfies some properties and extracts its attribute values. You can compose predicates using Functor, Applicative and Alternative operators: *>, <*, <|> etc. Note, that it doesn't really have sense to use function like many or some, since the extracting predicate doesn't consume any input.

Constructors

Q

Fields

runQ :: a -> Maybe b

Instances

Functor (Q a)

Applicative (Q a)

Alternative (Q a)

true :: Q a a

Predicate which is always satisfied.

satisfy :: (a -> Bool) -> Q a a

Check if the given predicate is satisfied.