{- FOURMOLU_DISABLE -}
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{- FOURMOLU_ENABLE -}
module Language.EO.Phi.Rules.PhiPaper where

import Control.Monad (guard)
import Language.EO.Phi
import Language.EO.Phi.Rules.Common

-- * Yegor's Rules

-- | Rule 6.
rule6 :: Rule
rule6 :: Rule
rule6 Context
ctx (ObjectDispatch (Formation [Binding]
bindings) Attribute
a)
  | Just Object
obj <- Attribute -> [Binding] -> Maybe Object
lookupBinding Attribute
a [Binding]
bindings = do
      Bool -> [()]
forall (f :: * -> *). Alternative f => Bool -> f ()
guard (Context -> Object -> Bool
isNF Context
ctx Object
obj)
      Object -> [Object]
forall a. a -> [a]
forall (m :: * -> *) a. Monad m => a -> m a
return (Object -> [Binding] -> Object
Application Object
obj [Attribute -> Object -> Binding
AlphaBinding Attribute
Rho ([Binding] -> Object
Formation [Binding]
bindings')])
 where
  bindings' :: [Binding]
bindings' = (Binding -> Bool) -> [Binding] -> [Binding]
forall a. (a -> Bool) -> [a] -> [a]
filter (Bool -> Bool
not (Bool -> Bool) -> (Binding -> Bool) -> Binding -> Bool
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Binding -> Bool
isDispatched) [Binding]
bindings
  isDispatched :: Binding -> Bool
isDispatched (AlphaBinding Attribute
a' Object
_) = Attribute
a Attribute -> Attribute -> Bool
forall a. Eq a => a -> a -> Bool
== Attribute
a'
  isDispatched Binding
_ = Bool
False
rule6 Context
_ Object
_ = []