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Define a TermProjection datatype.

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This commit is contained in:
Rob Rix 2017-03-31 22:32:29 -04:00
parent 1cd2b5456b
commit c3b849105f
1 changed files with 5 additions and 1 deletions
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6
src/Command/Parse.hs
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@ -1,4 +1,4 @@
{-# LANGUAGE DataKinds, ScopedTypeVariables, TypeFamilies, TypeOperators #-}
{-# LANGUAGE DataKinds, GADTs, ScopedTypeVariables, TypeFamilies, TypeOperators #-}
module Command.Parse where
import Arguments
@ -83,6 +83,10 @@ parseRoot construct combine args@Arguments{..} = do
makeNode (head :. range :. category :. sourceSpan :. Nil) syntax =
ParseNode (toS category) range head sourceSpan (identifierFor syntax)
data TermProjection (fields :: [*]) output where
Index :: Maybe Source -> TermProjection fields [ParseNode]
ParseTree :: Maybe Source -> TermProjection fields (Rose ParseNode)
-- | Constructs IndexFile nodes for the provided arguments and encodes them to JSON.
parseIndex :: Arguments -> IO ByteString
parseIndex = fmap (toS . encode) . parseRoot IndexFile (\ node siblings -> node : concat siblings)