{-# LANGUAGE RankNTypes #-}

module Hhp.Syb (
    listifySpans
  ) where

import GHC (TypecheckedSource, Located, GenLocated(L), isGoodSrcSpan, spans)

import Data.Generics

listifySpans :: Typeable a => TypecheckedSource -> (Int, Int) -> [Located a]
listifySpans :: TypecheckedSource -> (Int, Int) -> [Located a]
listifySpans TypecheckedSource
tcs (Int, Int)
lc = ([Located a] -> [Located a] -> [Located a])
-> GenericQ [Located a] -> TypecheckedSource -> [Located a]
forall r. (r -> r -> r) -> GenericQ r -> GenericQ r
everything' [Located a] -> [Located a] -> [Located a]
forall a. [a] -> [a] -> [a]
(++) ([] [Located a] -> (Located a -> [Located a]) -> a -> [Located a]
forall a b r. (Typeable a, Typeable b) => r -> (b -> r) -> a -> r
`mkQ` (\Located a
x -> [Located a
x | Located a -> Bool
forall e. GenLocated SrcSpan e -> Bool
p Located a
x])) TypecheckedSource
tcs
  where
    p :: GenLocated SrcSpan e -> Bool
p (L SrcSpan
spn e
_) = SrcSpan -> Bool
isGoodSrcSpan SrcSpan
spn Bool -> Bool -> Bool
&& SrcSpan
spn SrcSpan -> (Int, Int) -> Bool
`spans` (Int, Int)
lc

everything' :: (r -> r -> r) -> GenericQ r -> GenericQ r
everything' :: (r -> r -> r) -> GenericQ r -> GenericQ r
everything' r -> r -> r
k GenericQ r
f a
x = (r -> r -> r) -> r -> [r] -> r
forall (t :: * -> *) b a.
Foldable t =>
(b -> a -> b) -> b -> t a -> b
foldl r -> r -> r
k (a -> r
GenericQ r
f a
x) ([r] -> r) -> [r] -> r
forall a b. (a -> b) -> a -> b
$ GenericQ r -> a -> [r]
forall a u. Data a => (forall d. Data d => d -> u) -> a -> [u]
gmapQ ((r -> r -> r) -> GenericQ r -> GenericQ r
forall r. (r -> r -> r) -> GenericQ r -> GenericQ r
everything' r -> r -> r
k GenericQ r
f) a
x