-----------------------------------------------------------------------------

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-- |
-- Module      :  Distribution.Simple.CCompiler
-- Copyright   :  2011, Dan Knapp
--
-- Maintainer  :  cabal-devel@haskell.org
-- Portability :  portable
--
-- This simple package provides types and functions for interacting with
-- C compilers.  Currently it's just a type enumerating extant C-like
-- languages, which we call dialects.
module Distribution.Simple.CCompiler
  ( CDialect (..)
  , cSourceExtensions
  , cDialectFilenameExtension
  , filenameCDialect
  ) where

import Distribution.Compat.Prelude
import Prelude ()

import System.FilePath
  ( takeExtension
  )

-- | Represents a dialect of C.  The Monoid instance expresses backward
--   compatibility, in the sense that 'mappend a b' is the least inclusive
--   dialect which both 'a' and 'b' can be correctly interpreted as.
data CDialect
  = C
  | ObjectiveC
  | CPlusPlus
  | ObjectiveCPlusPlus
  deriving (CDialect -> CDialect -> Bool
(CDialect -> CDialect -> Bool)
-> (CDialect -> CDialect -> Bool) -> Eq CDialect
forall a. (a -> a -> Bool) -> (a -> a -> Bool) -> Eq a
$c== :: CDialect -> CDialect -> Bool
== :: CDialect -> CDialect -> Bool
$c/= :: CDialect -> CDialect -> Bool
/= :: CDialect -> CDialect -> Bool
Eq, Int -> CDialect -> ShowS
[CDialect] -> ShowS
CDialect -> String
(Int -> CDialect -> ShowS)
-> (CDialect -> String) -> ([CDialect] -> ShowS) -> Show CDialect
forall a.
(Int -> a -> ShowS) -> (a -> String) -> ([a] -> ShowS) -> Show a
$cshowsPrec :: Int -> CDialect -> ShowS
showsPrec :: Int -> CDialect -> ShowS
$cshow :: CDialect -> String
show :: CDialect -> String
$cshowList :: [CDialect] -> ShowS
showList :: [CDialect] -> ShowS
Show)

instance Monoid CDialect where
  mempty :: CDialect
mempty = CDialect
C
  mappend :: CDialect -> CDialect -> CDialect
mappend = CDialect -> CDialect -> CDialect
forall a. Semigroup a => a -> a -> a
(<>)

instance Semigroup CDialect where
  CDialect
C <> :: CDialect -> CDialect -> CDialect
<> CDialect
anything = CDialect
anything
  CDialect
ObjectiveC <> CDialect
CPlusPlus = CDialect
ObjectiveCPlusPlus
  CDialect
CPlusPlus <> CDialect
ObjectiveC = CDialect
ObjectiveCPlusPlus
  CDialect
_ <> CDialect
ObjectiveCPlusPlus = CDialect
ObjectiveCPlusPlus
  CDialect
ObjectiveC <> CDialect
_ = CDialect
ObjectiveC
  CDialect
CPlusPlus <> CDialect
_ = CDialect
CPlusPlus
  CDialect
ObjectiveCPlusPlus <> CDialect
_ = CDialect
ObjectiveCPlusPlus

-- | A list of all file extensions which are recognized as possibly containing
--   some dialect of C code.  Note that this list is only for source files,
--   not for header files.
cSourceExtensions :: [String]
cSourceExtensions :: [String]
cSourceExtensions =
  [ String
"c"
  , String
"i"
  , String
"ii"
  , String
"m"
  , String
"mi"
  , String
"mm"
  , String
"M"
  , String
"mii"
  , String
"cc"
  , String
"cp"
  , String
"cxx"
  , String
"cpp"
  , String
"CPP"
  , String
"c++"
  , String
"C"
  ]

-- | Takes a dialect of C and whether code is intended to be passed through
--   the preprocessor, and returns a filename extension for containing that
--   code.
cDialectFilenameExtension :: CDialect -> Bool -> String
cDialectFilenameExtension :: CDialect -> Bool -> String
cDialectFilenameExtension CDialect
C Bool
True = String
"c"
cDialectFilenameExtension CDialect
C Bool
False = String
"i"
cDialectFilenameExtension CDialect
ObjectiveC Bool
True = String
"m"
cDialectFilenameExtension CDialect
ObjectiveC Bool
False = String
"mi"
cDialectFilenameExtension CDialect
CPlusPlus Bool
True = String
"cpp"
cDialectFilenameExtension CDialect
CPlusPlus Bool
False = String
"ii"
cDialectFilenameExtension CDialect
ObjectiveCPlusPlus Bool
True = String
"mm"
cDialectFilenameExtension CDialect
ObjectiveCPlusPlus Bool
False = String
"mii"

-- | Infers from a filename's extension the dialect of C which it contains,
--   and whether it is intended to be passed through the preprocessor.
filenameCDialect :: String -> Maybe (CDialect, Bool)
filenameCDialect :: String -> Maybe (CDialect, Bool)
filenameCDialect String
filename = do
  String
extension <- case ShowS
takeExtension String
filename of
    Char
'.' : String
ext -> String -> Maybe String
forall a. a -> Maybe a
Just String
ext
    String
_ -> Maybe String
forall a. Maybe a
Nothing
  case String
extension of
    String
"c" -> (CDialect, Bool) -> Maybe (CDialect, Bool)
forall a. a -> Maybe a
forall (m :: * -> *) a. Monad m => a -> m a
return (CDialect
C, Bool
True)
    String
"i" -> (CDialect, Bool) -> Maybe (CDialect, Bool)
forall a. a -> Maybe a
forall (m :: * -> *) a. Monad m => a -> m a
return (CDialect
C, Bool
False)
    String
"ii" -> (CDialect, Bool) -> Maybe (CDialect, Bool)
forall a. a -> Maybe a
forall (m :: * -> *) a. Monad m => a -> m a
return (CDialect
CPlusPlus, Bool
False)
    String
"m" -> (CDialect, Bool) -> Maybe (CDialect, Bool)
forall a. a -> Maybe a
forall (m :: * -> *) a. Monad m => a -> m a
return (CDialect
ObjectiveC, Bool
True)
    String
"mi" -> (CDialect, Bool) -> Maybe (CDialect, Bool)
forall a. a -> Maybe a
forall (m :: * -> *) a. Monad m => a -> m a
return (CDialect
ObjectiveC, Bool
False)
    String
"mm" -> (CDialect, Bool) -> Maybe (CDialect, Bool)
forall a. a -> Maybe a
forall (m :: * -> *) a. Monad m => a -> m a
return (CDialect
ObjectiveCPlusPlus, Bool
True)
    String
"M" -> (CDialect, Bool) -> Maybe (CDialect, Bool)
forall a. a -> Maybe a
forall (m :: * -> *) a. Monad m => a -> m a
return (CDialect
ObjectiveCPlusPlus, Bool
True)
    String
"mii" -> (CDialect, Bool) -> Maybe (CDialect, Bool)
forall a. a -> Maybe a
forall (m :: * -> *) a. Monad m => a -> m a
return (CDialect
ObjectiveCPlusPlus, Bool
False)
    String
"cc" -> (CDialect, Bool) -> Maybe (CDialect, Bool)
forall a. a -> Maybe a
forall (m :: * -> *) a. Monad m => a -> m a
return (CDialect
CPlusPlus, Bool
True)
    String
"cp" -> (CDialect, Bool) -> Maybe (CDialect, Bool)
forall a. a -> Maybe a
forall (m :: * -> *) a. Monad m => a -> m a
return (CDialect
CPlusPlus, Bool
True)
    String
"cxx" -> (CDialect, Bool) -> Maybe (CDialect, Bool)
forall a. a -> Maybe a
forall (m :: * -> *) a. Monad m => a -> m a
return (CDialect
CPlusPlus, Bool
True)
    String
"cpp" -> (CDialect, Bool) -> Maybe (CDialect, Bool)
forall a. a -> Maybe a
forall (m :: * -> *) a. Monad m => a -> m a
return (CDialect
CPlusPlus, Bool
True)
    String
"CPP" -> (CDialect, Bool) -> Maybe (CDialect, Bool)
forall a. a -> Maybe a
forall (m :: * -> *) a. Monad m => a -> m a
return (CDialect
CPlusPlus, Bool
True)
    String
"c++" -> (CDialect, Bool) -> Maybe (CDialect, Bool)
forall a. a -> Maybe a
forall (m :: * -> *) a. Monad m => a -> m a
return (CDialect
CPlusPlus, Bool
True)
    String
"C" -> (CDialect, Bool) -> Maybe (CDialect, Bool)
forall a. a -> Maybe a
forall (m :: * -> *) a. Monad m => a -> m a
return (CDialect
CPlusPlus, Bool
True)
    String
_ -> Maybe (CDialect, Bool)
forall a. Maybe a
Nothing