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|
{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE ScopedTypeVariables #-}
module Haddock.Backends.Hyperlinker.Ast
( enrich
, RichToken(..), RichTokenType(..), TokenDetails(..)
) where
import Haddock.Backends.Hyperlinker.Parser
import qualified GHC
import Control.Applicative
import Data.Data
import Data.Maybe
data RichToken = RichToken
{ rtkToken :: Token
, rtkDetails :: Maybe TokenDetails
}
data TokenDetails = TokenDetails
{ rtkType :: RichTokenType
, rtkName :: GHC.Name
}
data RichTokenType
= RtkVar
| RtkType
| RtkBind
enrich :: GHC.RenamedSource -> [Token] -> [RichToken]
enrich src =
map $ \token -> RichToken
{ rtkToken = token
, rtkDetails = lookupBySpan (tkSpan token) detailsMap
}
where
detailsMap = variables src ++ types src ++ binds src
type DetailsMap = [(GHC.SrcSpan, TokenDetails)]
lookupBySpan :: Span -> DetailsMap -> Maybe TokenDetails
lookupBySpan tspan = listToMaybe . map snd . filter (matches tspan . fst)
everything :: (r -> r -> r) -> (forall a. Data a => a -> r)
-> (forall a. Data a => a -> r)
everything k f x = foldl k (f x) (gmapQ (everything k f) x)
combine :: Alternative f => (forall a. Data a => a -> f r) -> (forall a. Data a => a -> f r) -> (forall a. Data a => a -> f r)
combine f g x = f x <|> g x
variables :: GHC.RenamedSource -> DetailsMap
variables =
everything (<|>) var
where
var term = case cast term of
(Just (GHC.L sspan (GHC.HsVar name))) ->
pure (sspan, TokenDetails RtkVar name)
_ -> empty
types :: GHC.RenamedSource -> DetailsMap
types =
everything (<|>) ty
where
ty term = case cast term of
(Just (GHC.L sspan (GHC.HsTyVar name))) ->
pure (sspan, TokenDetails RtkType name)
_ -> empty
binds :: GHC.RenamedSource -> DetailsMap
binds =
everything (<|>) (fun `combine` pat)
where
fun term = case cast term of
(Just (GHC.FunBind (GHC.L sspan name) _ _ _ _ _ :: GHC.HsBind GHC.Name)) ->
pure (sspan, TokenDetails RtkBind name)
_ -> empty
pat term = case cast term of
(Just (GHC.L sspan (GHC.VarPat name))) ->
pure (sspan, TokenDetails RtkBind name)
_ -> empty
matches :: Span -> GHC.SrcSpan -> Bool
matches tspan (GHC.RealSrcSpan aspan)
| rs && cs && re && ce = True
where
rs = (posRow . spStart) tspan == GHC.srcSpanStartLine aspan
cs = (posCol . spStart) tspan == GHC.srcSpanStartCol aspan
re = (posRow . spEnd) tspan == GHC.srcSpanEndLine aspan
ce = (posCol . spEnd) tspan == GHC.srcSpanEndCol aspan
matches _ _ = False
|
