License | BSD-3-Clause |
---|---|
Maintainer | Jamie Willis |
Stability | stable |
Safe Haskell | None |
Language | Haskell2010 |
This module exports the Defunc
type and associated patterns. These are by no means required
to use Parsley, however they can serve as useful shortcuts to their regular Haskell equivalents.
As they are in datatype form, they are inspectable by the internal Parsley machinery, which may
improve optimisation opportunities or code generation.
Since: 0.1.0.0
Synopsis
- data Defunc a where
- ID :: Defunc (a -> a)
- COMPOSE :: Defunc ((b -> c) -> (a -> b) -> a -> c)
- FLIP :: Defunc ((a -> b -> c) -> b -> a -> c)
- APP_H :: Defunc (a -> b) -> Defunc a -> Defunc b
- EQ_H :: Eq a => Defunc a -> Defunc (a -> Bool)
- LIFTED :: (Show a, Lift a) => a -> Defunc a
- CONS :: Defunc (a -> [a] -> [a])
- CONST :: Defunc (a -> b -> a)
- EMPTY :: Defunc [a]
- BLACK :: WQ a -> Defunc a
- IF_S :: Defunc Bool -> Defunc a -> Defunc a -> Defunc a
- LAM_S :: (Defunc a -> Defunc b) -> Defunc (a -> b)
- LET_S :: Defunc a -> (Defunc a -> Defunc b) -> Defunc b
- pattern UNIT :: Defunc ()
- pattern FLIP_CONST :: () => x ~ (a -> b -> b) => Defunc x
- pattern FLIP_H :: () => (x -> y) ~ ((a -> b -> c) -> b -> a -> c) => Defunc x -> Defunc y
- pattern COMPOSE_H :: () => (x -> y -> z) ~ ((b -> c) -> (a -> b) -> a -> c) => Defunc x -> Defunc y -> Defunc z
Documentation
This datatype is useful for providing an inspectable representation of common Haskell functions.
These can be provided in place of WQ
to any combinator that requires it. The only difference is
that the Parsley compiler is able to manipulate and match on the constructors, which might lead to
optimisations. They can also be more convenient than constructing the WQ
object itself:
ID ~= WQ id [||id||] APP_H f x ~= WQ (f x) [||f x||]
Since: 0.1.0.0
ID :: Defunc (a -> a) | Corresponds to the standard |
COMPOSE :: Defunc ((b -> c) -> (a -> b) -> a -> c) | Corresponds to the standard |
FLIP :: Defunc ((a -> b -> c) -> b -> a -> c) | Corresponds to the standard |
APP_H :: Defunc (a -> b) -> Defunc a -> Defunc b | Corresponds to function application of two other |
EQ_H :: Eq a => Defunc a -> Defunc (a -> Bool) | Corresponds to the partially applied |
LIFTED :: (Show a, Lift a) => a -> Defunc a | Represents a liftable, showable value |
CONS :: Defunc (a -> [a] -> [a]) | Represents the standard |
CONST :: Defunc (a -> b -> a) | Represents the standard |
EMPTY :: Defunc [a] | Represents the empty list |
BLACK :: WQ a -> Defunc a | Wraps up any value of type |
IF_S :: Defunc Bool -> Defunc a -> Defunc a -> Defunc a | Represents the regular Haskell Since: 0.1.1.0 |
LAM_S :: (Defunc a -> Defunc b) -> Defunc (a -> b) | Represents a Haskell lambda abstraction Since: 0.1.1.0 |
LET_S :: Defunc a -> (Defunc a -> Defunc b) -> Defunc b | Represents a Haskell let binding Since: 0.1.1.0 |
pattern FLIP_CONST :: () => x ~ (a -> b -> b) => Defunc x Source #
Represents the flipped standard const
function applied to no arguments
Since: 0.1.0.0