{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE DeriveGeneric      #-}
module Distribution.Types.MungedPackageName
  ( MungedPackageName (..)
  , decodeCompatPackageName
  , encodeCompatPackageName
  ) where

import Distribution.Compat.Prelude
import Prelude ()

import Distribution.Parsec
import Distribution.Pretty
import Distribution.Types.LibraryName
import Distribution.Types.PackageName
import Distribution.Types.UnqualComponentName

import qualified Distribution.Compat.CharParsing as P
import qualified Text.PrettyPrint as Disp

-- | A combination of a package and component name used in various legacy
-- interfaces, chiefly bundled with a version as 'MungedPackageId'. It's generally
-- better to use a 'UnitId' to opaquely refer to some compilation/packing unit,
-- but that doesn't always work, e.g. where a "name" is needed, in which case
-- this can be used as a fallback.
--
-- Use 'mkMungedPackageName' and 'unMungedPackageName' to convert from/to a 'String'.
--
-- In @3.0.0.0@ representation was changed from opaque (string) to semantic representation.
--
-- @since 2.0.0.2
--
data MungedPackageName = MungedPackageName !PackageName !LibraryName
  deriving ((forall x. MungedPackageName -> Rep MungedPackageName x)
-> (forall x. Rep MungedPackageName x -> MungedPackageName)
-> Generic MungedPackageName
forall x. Rep MungedPackageName x -> MungedPackageName
forall x. MungedPackageName -> Rep MungedPackageName x
forall a.
(forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a
$cto :: forall x. Rep MungedPackageName x -> MungedPackageName
$cfrom :: forall x. MungedPackageName -> Rep MungedPackageName x
Generic, ReadPrec [MungedPackageName]
ReadPrec MungedPackageName
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$creadListPrec :: ReadPrec [MungedPackageName]
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$creadPrec :: ReadPrec MungedPackageName
readList :: ReadS [MungedPackageName]
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forall a. (a -> a -> Bool) -> (a -> a -> Bool) -> Eq a
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$c/= :: MungedPackageName -> MungedPackageName -> Bool
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-> Ord MungedPackageName
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$cmin :: MungedPackageName -> MungedPackageName -> MungedPackageName
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DataType
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    (forall d b. Data d => c (d -> b) -> d -> c b)
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$tMungedPackageName :: DataType
gmapMo :: (forall d. Data d => d -> m d)
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gmapQ :: (forall d. Data d => d -> u) -> MungedPackageName -> [u]
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-> MungedPackageName -> MungedPackageName
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-> MungedPackageName -> MungedPackageName
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Typeable t =>
(forall d e. (Data d, Data e) => c (t d e))
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Typeable t =>
(forall d. Data d => c (t d)) -> Maybe (c MungedPackageName)
dataTypeOf :: MungedPackageName -> DataType
$cdataTypeOf :: MungedPackageName -> DataType
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(forall b r. Data b => c (b -> r) -> c r)
-> (forall r. r -> c r) -> Constr -> c MungedPackageName
gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b)
-> (forall g. g -> c g) -> MungedPackageName -> c MungedPackageName
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(forall d b. Data d => c (d -> b) -> d -> c b)
-> (forall g. g -> c g) -> MungedPackageName -> c MungedPackageName
$cp1Data :: Typeable MungedPackageName
Data)

instance Binary MungedPackageName
instance NFData MungedPackageName where rnf :: MungedPackageName -> ()
rnf = MungedPackageName -> ()
forall a. (Generic a, GNFData (Rep a)) => a -> ()
genericRnf

-- | Computes the package name for a library.  If this is the public
-- library, it will just be the original package name; otherwise,
-- it will be a munged package name recording the original package
-- name as well as the name of the internal library.
--
-- A lot of tooling in the Haskell ecosystem assumes that if something
-- is installed to the package database with the package name 'foo',
-- then it actually is an entry for the (only public) library in package
-- 'foo'.  With internal packages, this is not necessarily true:
-- a public library as well as arbitrarily many internal libraries may
-- come from the same package.  To prevent tools from getting confused
-- in this case, the package name of these internal libraries is munged
-- so that they do not conflict the public library proper.  A particular
-- case where this matters is ghc-pkg: if we don't munge the package
-- name, the inplace registration will OVERRIDE a different internal
-- library.
--
-- We munge into a reserved namespace, "z-", and encode both the
-- component name and the package name of an internal library using the
-- following format:
--
--      compat-pkg-name ::= "z-" package-name "-z-" library-name
--
-- where package-name and library-name have "-" ( "z" + ) "-"
-- segments encoded by adding an extra "z".
--
-- When we have the public library, the compat-pkg-name is just the
-- package-name, no surprises there!
--
-- >>> prettyShow $ MungedPackageName "servant" LMainLibName
-- "servant"
--
-- >>> prettyShow $ MungedPackageName "servant" (LSubLibName "lackey") 
-- "z-servant-z-lackey"
--
instance Pretty MungedPackageName where
    -- First handle the cases where we can just use the original 'PackageName'.
    -- This is for the PRIMARY library, and it is non-Backpack, or the
    -- indefinite package for us.
    pretty :: MungedPackageName -> Doc
pretty = String -> Doc
Disp.text (String -> Doc)
-> (MungedPackageName -> String) -> MungedPackageName -> Doc
forall b c a. (b -> c) -> (a -> b) -> a -> c
. MungedPackageName -> String
encodeCompatPackageName'

-- | 
--
-- >>> simpleParsec "servant" :: Maybe MungedPackageName
-- Just (MungedPackageName (PackageName "servant") LMainLibName)
--
-- >>> simpleParsec "z-servant-z-lackey" :: Maybe MungedPackageName
-- Just (MungedPackageName (PackageName "servant") (LSubLibName (UnqualComponentName "lackey")))
--
-- >>> simpleParsec "z-servant-zz" :: Maybe MungedPackageName
-- Just (MungedPackageName (PackageName "z-servant-zz") LMainLibName)
--
instance Parsec MungedPackageName where
    parsec :: m MungedPackageName
parsec = String -> MungedPackageName
decodeCompatPackageName' (String -> MungedPackageName) -> m String -> m MungedPackageName
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> m String
forall (m :: * -> *). CabalParsing m => m String
parsecUnqualComponentName

-------------------------------------------------------------------------------
-- ZDashCode conversions
-------------------------------------------------------------------------------

-- | Intended for internal use only
--
-- >>> decodeCompatPackageName "z-servant-z-lackey"
-- MungedPackageName (PackageName "servant") (LSubLibName (UnqualComponentName "lackey"))
--
decodeCompatPackageName :: PackageName -> MungedPackageName
decodeCompatPackageName :: PackageName -> MungedPackageName
decodeCompatPackageName = String -> MungedPackageName
decodeCompatPackageName' (String -> MungedPackageName)
-> (PackageName -> String) -> PackageName -> MungedPackageName
forall b c a. (b -> c) -> (a -> b) -> a -> c
. PackageName -> String
unPackageName

-- | Intended for internal use only
--
-- >>> encodeCompatPackageName $ MungedPackageName "servant" (LSubLibName "lackey")
-- PackageName "z-servant-z-lackey"
--
-- This is used in @cabal-install@ in the Solver.
-- May become obsolete as solver moves to per-component solving.
--
encodeCompatPackageName :: MungedPackageName -> PackageName
encodeCompatPackageName :: MungedPackageName -> PackageName
encodeCompatPackageName = String -> PackageName
mkPackageName (String -> PackageName)
-> (MungedPackageName -> String)
-> MungedPackageName
-> PackageName
forall b c a. (b -> c) -> (a -> b) -> a -> c
. MungedPackageName -> String
encodeCompatPackageName'

decodeCompatPackageName' :: String -> MungedPackageName
decodeCompatPackageName' :: String -> MungedPackageName
decodeCompatPackageName' String
m =
    case String
m of
        Char
'z':Char
'-':String
rest | Right [String
pn, String
cn] <- ParsecParser [String] -> String -> Either String [String]
forall a. ParsecParser a -> String -> Either String a
explicitEitherParsec ParsecParser [String]
forall (m :: * -> *). CabalParsing m => m [String]
parseZDashCode String
rest
            -> PackageName -> LibraryName -> MungedPackageName
MungedPackageName (String -> PackageName
mkPackageName String
pn) (UnqualComponentName -> LibraryName
LSubLibName (String -> UnqualComponentName
mkUnqualComponentName String
cn))
        String
s   -> PackageName -> LibraryName -> MungedPackageName
MungedPackageName (String -> PackageName
mkPackageName String
s) LibraryName
LMainLibName

encodeCompatPackageName' :: MungedPackageName -> String
encodeCompatPackageName' :: MungedPackageName -> String
encodeCompatPackageName' (MungedPackageName PackageName
pn LibraryName
LMainLibName)      = PackageName -> String
unPackageName PackageName
pn
encodeCompatPackageName' (MungedPackageName PackageName
pn (LSubLibName UnqualComponentName
uqn)) =
     String
"z-" String -> ShowS
forall a. [a] -> [a] -> [a]
++ ShowS
zdashcode (PackageName -> String
unPackageName PackageName
pn) String -> ShowS
forall a. [a] -> [a] -> [a]
++
    String
"-z-" String -> ShowS
forall a. [a] -> [a] -> [a]
++ ShowS
zdashcode (UnqualComponentName -> String
unUnqualComponentName UnqualComponentName
uqn)

zdashcode :: String -> String
zdashcode :: ShowS
zdashcode String
s = String -> Maybe Int -> ShowS
forall a. (Ord a, Num a) => String -> Maybe a -> ShowS
go String
s (Maybe Int
forall a. Maybe a
Nothing :: Maybe Int) []
    where go :: String -> Maybe a -> ShowS
go [] Maybe a
_ String
r = ShowS
forall a. [a] -> [a]
reverse String
r
          go (Char
'-':String
z) (Just a
n) String
r | a
n a -> a -> Bool
forall a. Ord a => a -> a -> Bool
> a
0 = String -> Maybe a -> ShowS
go String
z (a -> Maybe a
forall a. a -> Maybe a
Just a
0) (Char
'-'Char -> ShowS
forall a. a -> [a] -> [a]
:Char
'z'Char -> ShowS
forall a. a -> [a] -> [a]
:String
r)
          go (Char
'-':String
z) Maybe a
_        String
r = String -> Maybe a -> ShowS
go String
z (a -> Maybe a
forall a. a -> Maybe a
Just a
0) (Char
'-'Char -> ShowS
forall a. a -> [a] -> [a]
:String
r)
          go (Char
'z':String
z) (Just a
n) String
r = String -> Maybe a -> ShowS
go String
z (a -> Maybe a
forall a. a -> Maybe a
Just (a
na -> a -> a
forall a. Num a => a -> a -> a
+a
1)) (Char
'z'Char -> ShowS
forall a. a -> [a] -> [a]
:String
r)
          go (Char
c:String
z)   Maybe a
_        String
r = String -> Maybe a -> ShowS
go String
z Maybe a
forall a. Maybe a
Nothing (Char
cChar -> ShowS
forall a. a -> [a] -> [a]
:String
r)

parseZDashCode :: CabalParsing m => m [String]
parseZDashCode :: m [String]
parseZDashCode = do
    [String]
ns <- m String -> m Char -> m [String]
forall (m :: * -> *) a sep. Alternative m => m a -> m sep -> m [a]
P.sepBy1 (m Char -> m String
forall (f :: * -> *) a. Alternative f => f a -> f [a]
some ((Char -> Bool) -> m Char
forall (m :: * -> *). CharParsing m => (Char -> Bool) -> m Char
P.satisfy (Char -> Char -> Bool
forall a. Eq a => a -> a -> Bool
/= Char
'-'))) (Char -> m Char
forall (m :: * -> *). CharParsing m => Char -> m Char
P.char Char
'-')
    [String] -> m [String]
forall (m :: * -> *) a. Monad m => a -> m a
return ([String] -> [String]
go [String]
ns)
  where
    go :: [String] -> [String]
go [String]
ns = case (String -> Bool) -> [String] -> ([String], [String])
forall a. (a -> Bool) -> [a] -> ([a], [a])
break (String -> String -> Bool
forall a. Eq a => a -> a -> Bool
==String
"z") [String]
ns of
                ([String]
_, []) -> [[String] -> String
paste [String]
ns]
                ([String]
as, String
"z":[String]
bs) -> [String] -> String
paste [String]
as String -> [String] -> [String]
forall a. a -> [a] -> [a]
: [String] -> [String]
go [String]
bs
                ([String], [String])
_ -> String -> [String]
forall a. HasCallStack => String -> a
error String
"parseZDashCode: go"
    unZ :: String -> String
    unZ :: ShowS
unZ String
"" = ShowS
forall a. HasCallStack => String -> a
error String
"parseZDashCode: unZ"
    unZ r :: String
r@(Char
'z':String
zs) | (Char -> Bool) -> String -> Bool
forall (t :: * -> *) a. Foldable t => (a -> Bool) -> t a -> Bool
all (Char -> Char -> Bool
forall a. Eq a => a -> a -> Bool
==Char
'z') String
zs = String
zs
                   | Bool
otherwise      = String
r
    unZ String
r = String
r
    paste :: [String] -> String
    paste :: [String] -> String
paste = String -> [String] -> String
forall a. [a] -> [[a]] -> [a]
intercalate String
"-" ([String] -> String)
-> ([String] -> [String]) -> [String] -> String
forall b c a. (b -> c) -> (a -> b) -> a -> c
. ShowS -> [String] -> [String]
forall a b. (a -> b) -> [a] -> [b]
map ShowS
unZ

-- $setup
-- >>> :seti -XOverloadedStrings