module GHC.Types.Target
   ( Target(..)
   , TargetId(..)
   , InputFileBuffer
   , pprTarget
   , pprTargetId
   )
where

import GHC.Prelude
import GHC.Driver.Phases ( Phase )
import GHC.Unit
import GHC.Data.StringBuffer ( StringBuffer )
import GHC.Utils.Outputable

import Data.Time

-- | A compilation target.
--
-- A target may be supplied with the actual text of the
-- module.  If so, use this instead of the file contents (this
-- is for use in an IDE where the file hasn't been saved by
-- the user yet).
data Target
  = Target {
      Target -> TargetId
targetId           :: !TargetId, -- ^ module or filename
      Target -> Bool
targetAllowObjCode :: !Bool,     -- ^ object code allowed?
      Target -> Maybe (InputFileBuffer, UTCTime)
targetContents     :: !(Maybe (InputFileBuffer, UTCTime))
      -- ^ Optional in-memory buffer containing the source code GHC should
      -- use for this target instead of reading it from disk.
      --
      -- Since GHC version 8.10 modules which require preprocessors such as
      -- Literate Haskell or CPP to run are also supported.
      --
      -- If a corresponding source file does not exist on disk this will
      -- result in a 'SourceError' exception if @targetId = TargetModule _@
      -- is used. However together with @targetId = TargetFile _@ GHC will
      -- not complain about the file missing.
    }

data TargetId
  = TargetModule !ModuleName
        -- ^ A module name: search for the file
  | TargetFile !FilePath !(Maybe Phase)
        -- ^ A filename: preprocess & parse it to find the module name.
        -- If specified, the Phase indicates how to compile this file
        -- (which phase to start from).  Nothing indicates the starting phase
        -- should be determined from the suffix of the filename.
  deriving TargetId -> TargetId -> Bool
(TargetId -> TargetId -> Bool)
-> (TargetId -> TargetId -> Bool) -> Eq TargetId
forall a. (a -> a -> Bool) -> (a -> a -> Bool) -> Eq a
/= :: TargetId -> TargetId -> Bool
$c/= :: TargetId -> TargetId -> Bool
== :: TargetId -> TargetId -> Bool
$c== :: TargetId -> TargetId -> Bool
Eq

type InputFileBuffer = StringBuffer


pprTarget :: Target -> SDoc
pprTarget :: Target -> SDoc
pprTarget (Target TargetId
id Bool
obj Maybe (InputFileBuffer, UTCTime)
_) =
    (if Bool
obj then SDoc
empty else Char -> SDoc
char Char
'*') SDoc -> SDoc -> SDoc
<> TargetId -> SDoc
pprTargetId TargetId
id

instance Outputable Target where
    ppr :: Target -> SDoc
ppr = Target -> SDoc
pprTarget

pprTargetId :: TargetId -> SDoc
pprTargetId :: TargetId -> SDoc
pprTargetId (TargetModule ModuleName
m) = ModuleName -> SDoc
forall a. Outputable a => a -> SDoc
ppr ModuleName
m
pprTargetId (TargetFile FilePath
f Maybe Phase
_) = FilePath -> SDoc
text FilePath
f

instance Outputable TargetId where
    ppr :: TargetId -> SDoc
ppr = TargetId -> SDoc
pprTargetId