Text.Boomerang.Prim

Types

newtype Parser e tok a

Yet another parser.

Returns all possible parses and parse errors

Constructors

Parser

Fields

• runParser :: tok -> Pos e -> [Either e ((a, tok), Pos e)]

Instances

Monad (Parser e tok)

Methods

(>>=) :: Parser e tok a -> (a -> Parser e tok b) -> Parser e tok b

(>>) :: Parser e tok a -> Parser e tok b -> Parser e tok b

return :: a -> Parser e tok a

fail :: String -> Parser e tok a

Functor (Parser e tok)

Methods

fmap :: (a -> b) -> Parser e tok a -> Parser e tok b

(<$) :: a -> Parser e tok b -> Parser e tok a

Applicative (Parser e tok)

Methods

pure :: a -> Parser e tok a

(<*>) :: Parser e tok (a -> b) -> Parser e tok a -> Parser e tok b

(*>) :: Parser e tok a -> Parser e tok b -> Parser e tok b

(<*) :: Parser e tok a -> Parser e tok b -> Parser e tok a

Alternative (Parser e tok)

Methods

empty :: Parser e tok a

(<|>) :: Parser e tok a -> Parser e tok a -> Parser e tok a

some :: Parser e tok a -> Parser e tok [a]

many :: Parser e tok a -> Parser e tok [a]

MonadPlus (Parser e tok)

Methods

mzero :: Parser e tok a

mplus :: Parser e tok a -> Parser e tok a -> Parser e tok a

data Boomerang e tok a b

A Boomerang a b takes an a to parse a URL and results in b if parsing succeeds. And it takes a b to serialize to a URL and results in a if serializing succeeds.

Constructors

Boomerang

Fields

• prs :: Parser e tok (a -> b)
• ser :: b -> [(tok -> tok, a)]

Instances

Category * (Boomerang e tok)

Methods

id :: cat a a

(.) :: cat b c -> cat a b -> cat a c

Monoid (Boomerang e tok a b)

Methods

mempty :: Boomerang e tok a b

mappend :: Boomerang e tok a b -> Boomerang e tok a b -> Boomerang e tok a b

mconcat :: [Boomerang e tok a b] -> Boomerang e tok a b

type PrinterParser = Boomerang

Deprecated: Use Boomerang instead

(.~) :: Boomerang e tok a b -> Boomerang e tok b c -> Boomerang e tok a c infixr 9

Reverse composition, but with the side effects still in left-to-right order.

Running routers

parse :: forall e a p tok. InitialPosition e => Boomerang e tok () a -> tok -> [Either e (a, tok)]

Give all possible parses or errors.

parse1 :: (ErrorPosition e, InitialPosition e, Show e, Ord (Pos e)) => (tok -> Bool) -> Boomerang e tok () (a :- ()) -> tok -> Either [e] a

Give the first parse, for Boomerangs with a parser that yields just one value. Otherwise return the error (or errors) with the highest error position.

unparse :: tok -> Boomerang e tok () url -> url -> [tok]

Give all possible serializations.

unparse1 :: tok -> Boomerang e tok () (a :- ()) -> a -> Maybe tok

Give the first serialization, for Boomerangs with a serializer that needs just one value.

bestErrors :: (ErrorPosition e, Ord (Pos e)) => [e] -> [e]

Attempt to extract the most relevant errors from a list of parse errors.

The current heuristic is to find error (or errors) where the error position is highest.

Constructing / Manipulating Boomerangs

xpure :: (a -> b) -> (b -> Maybe a) -> Boomerang e tok a b

Lift a constructor-destructor pair to a pure router.

val :: forall e tok a r. Parser e tok a -> (a -> [tok -> tok]) -> Boomerang e tok r (a :- r)

lift a Parser and a printer into a Boomerang

xmap :: (a -> b) -> (b -> Maybe a) -> Boomerang e tok r a -> Boomerang e tok r b

Map over routers.

xmaph :: (a -> b) -> (b -> Maybe a) -> Boomerang e tok i (a :- o) -> Boomerang e tok i (b :- o)

Like "xmap", but only maps over the top of the stack.