Copyright | (C) 2014 Edward Kmett, (C) 2014 Eric Mertens |
---|---|
License | BSD-style (see the file LICENSE) |
Maintainer | Edward Kmett <ekmett@gmail.com> |
Stability | experimental |
Portability | non-portable |
Safe Haskell | Trustworthy |
Language | Haskell98 |
- makePrisms :: Name -> DecsQ
- makeClassyPrisms :: Name -> DecsQ
- makeDecPrisms :: Bool -> Dec -> DecsQ
Documentation
Generate a Prism
for each constructor of a data type.
Isos generated when possible.
Reviews are created for constructors with existentially
quantified constructors and GADTs.
e.g.
data FooBarBaz a = Foo Int | Bar a | Baz Int Char makePrisms ''FooBarBaz
will create
_Foo :: Prism' (FooBarBaz a) Int _Bar :: Prism (FooBarBaz a) (FooBarBaz b) a b _Baz :: Prism' (FooBarBaz a) (Int, Char)
Generate a Prism
for each constructor of a data type
and combine them into a single class. No Isos are created.
Reviews are created for constructors with existentially
quantified constructors and GADTs.
e.g.
data FooBarBaz a = Foo Int | Bar a | Baz Int Char makeClassyPrisms ''FooBarBaz
will create
class AsFooBarBaz s a | s -> a where _FooBarBaz :: Prism' s (FooBarBaz a) _Foo :: Prism' s Int _Bar :: Prism' s a _Baz :: Prism' s (Int,Char) _Foo = _FooBarBaz . _Foo _Bar = _FooBarBaz . _Bar _Baz = _FooBarBaz . _Baz instance AsFooBarBaz (FooBarBaz a) a
Generate an As class of prisms. Names are selected by prefixing the constructor name with an underscore. Constructors with multiple fields will construct Prisms to tuples of those fields.
Generate prisms for the given Dec