{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE DeriveGeneric #-}

module Distribution.SPDX.LicenseExpression
  ( LicenseExpression (..)
  , SimpleLicenseExpression (..)
  , simpleLicenseExpression
  ) where

import Distribution.Compat.Prelude
import Prelude ()

import Distribution.Parsec
import Distribution.Pretty
import Distribution.SPDX.LicenseExceptionId
import Distribution.SPDX.LicenseId
import Distribution.SPDX.LicenseListVersion
import Distribution.SPDX.LicenseReference
import Distribution.Utils.Generic (isAsciiAlphaNum)

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

-- | SPDX License Expression.
--
-- @
-- idstring              = 1*(ALPHA \/ DIGIT \/ "-" \/ "." )
-- license id            = \<short form license identifier inAppendix I.1>
-- license exception id  = \<short form license exception identifier inAppendix I.2>
-- license ref           = [\"DocumentRef-"1*(idstring)":"]\"LicenseRef-"1*(idstring)
--
-- simple expression     = license id \/ license id"+" \/ license ref
--
-- compound expression   = 1*1(simple expression \/
--                         simple expression \"WITH" license exception id \/
--                         compound expression \"AND" compound expression \/
--                         compound expression \"OR" compound expression ) \/
--                         "(" compound expression ")" )
--
-- license expression    = 1*1(simple expression / compound expression)
-- @
data LicenseExpression
  = ELicense !SimpleLicenseExpression !(Maybe LicenseExceptionId)
  | EAnd !LicenseExpression !LicenseExpression
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-- | Simple License Expressions.
data SimpleLicenseExpression
  = -- | An SPDX License List Short Form Identifier. For example: @GPL-2.0-only@
    ELicenseId LicenseId
  | -- | An SPDX License List Short Form Identifier with a unary"+" operator suffix to represent the current version of the license or any later version.  For example: @GPL-2.0+@
    ELicenseIdPlus LicenseId
  | -- | A SPDX user defined license reference: For example: @LicenseRef-23@, @LicenseRef-MIT-Style-1@, or @DocumentRef-spdx-tool-1.2:LicenseRef-MIT-Style-2@
    ELicenseRef LicenseRef
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to :: forall x. Rep SimpleLicenseExpression x -> SimpleLicenseExpression
Generic)

simpleLicenseExpression :: LicenseId -> LicenseExpression
simpleLicenseExpression :: LicenseId -> LicenseExpression
simpleLicenseExpression LicenseId
i = SimpleLicenseExpression
-> Maybe LicenseExceptionId -> LicenseExpression
ELicense (LicenseId -> SimpleLicenseExpression
ELicenseId LicenseId
i) Maybe LicenseExceptionId
forall a. Maybe a
Nothing

instance Binary LicenseExpression
instance Binary SimpleLicenseExpression
instance Structured SimpleLicenseExpression
instance Structured LicenseExpression

instance Pretty LicenseExpression where
  pretty :: LicenseExpression -> Doc
pretty = Int -> LicenseExpression -> Doc
go Int
0
    where
      go :: Int -> LicenseExpression -> Disp.Doc
      go :: Int -> LicenseExpression -> Doc
go Int
_ (ELicense SimpleLicenseExpression
lic Maybe LicenseExceptionId
exc) =
        let doc :: Doc
doc = SimpleLicenseExpression -> Doc
forall a. Pretty a => a -> Doc
pretty SimpleLicenseExpression
lic
         in (Doc -> Doc)
-> (LicenseExceptionId -> Doc -> Doc)
-> Maybe LicenseExceptionId
-> Doc
-> Doc
forall b a. b -> (a -> b) -> Maybe a -> b
maybe Doc -> Doc
forall a. a -> a
id (\LicenseExceptionId
e Doc
d -> Doc
d Doc -> Doc -> Doc
<+> String -> Doc
Disp.text String
"WITH" Doc -> Doc -> Doc
<+> LicenseExceptionId -> Doc
forall a. Pretty a => a -> Doc
pretty LicenseExceptionId
e) Maybe LicenseExceptionId
exc Doc
doc
      go Int
d (EAnd LicenseExpression
e1 LicenseExpression
e2) = Bool -> Doc -> Doc
parens (Int
d Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
< Int
0) (Doc -> Doc) -> Doc -> Doc
forall a b. (a -> b) -> a -> b
$ Int -> LicenseExpression -> Doc
go Int
0 LicenseExpression
e1 Doc -> Doc -> Doc
<+> String -> Doc
Disp.text String
"AND" Doc -> Doc -> Doc
<+> Int -> LicenseExpression -> Doc
go Int
0 LicenseExpression
e2
      go Int
d (EOr LicenseExpression
e1 LicenseExpression
e2) = Bool -> Doc -> Doc
parens (Int
d Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
< Int
1) (Doc -> Doc) -> Doc -> Doc
forall a b. (a -> b) -> a -> b
$ Int -> LicenseExpression -> Doc
go Int
1 LicenseExpression
e1 Doc -> Doc -> Doc
<+> String -> Doc
Disp.text String
"OR" Doc -> Doc -> Doc
<+> Int -> LicenseExpression -> Doc
go Int
1 LicenseExpression
e2

      parens :: Bool -> Doc -> Doc
parens Bool
False Doc
doc = Doc
doc
      parens Bool
True Doc
doc = Doc -> Doc
Disp.parens Doc
doc

instance Pretty SimpleLicenseExpression where
  pretty :: SimpleLicenseExpression -> Doc
pretty (ELicenseId LicenseId
i) = LicenseId -> Doc
forall a. Pretty a => a -> Doc
pretty LicenseId
i
  pretty (ELicenseIdPlus LicenseId
i) = LicenseId -> Doc
forall a. Pretty a => a -> Doc
pretty LicenseId
i Doc -> Doc -> Doc
<<>> Char -> Doc
Disp.char Char
'+'
  pretty (ELicenseRef LicenseRef
r) = LicenseRef -> Doc
forall a. Pretty a => a -> Doc
pretty LicenseRef
r

instance Parsec SimpleLicenseExpression where
  parsec :: forall (m :: * -> *). CabalParsing m => m SimpleLicenseExpression
parsec = m String
forall (m :: * -> *). CharParsing m => m String
idstring m String
-> (String -> m SimpleLicenseExpression)
-> m SimpleLicenseExpression
forall a b. m a -> (a -> m b) -> m b
forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
>>= String -> m SimpleLicenseExpression
forall {m :: * -> *}.
CabalParsing m =>
String -> m SimpleLicenseExpression
simple
    where
      simple :: String -> m SimpleLicenseExpression
simple String
n
        | Just String
l <- String
"LicenseRef-" String -> String -> Maybe String
forall a. Eq a => [a] -> [a] -> Maybe [a]
`isPrefixOfMaybe` String
n =
            m SimpleLicenseExpression
-> (LicenseRef -> m SimpleLicenseExpression)
-> Maybe LicenseRef
-> m SimpleLicenseExpression
forall b a. b -> (a -> b) -> Maybe a -> b
maybe (String -> m SimpleLicenseExpression
forall a. String -> m a
forall (m :: * -> *) a. MonadFail m => String -> m a
fail (String -> m SimpleLicenseExpression)
-> String -> m SimpleLicenseExpression
forall a b. (a -> b) -> a -> b
$ String
"Incorrect LicenseRef format: " String -> ShowS
forall a. [a] -> [a] -> [a]
++ String
n) (SimpleLicenseExpression -> m SimpleLicenseExpression
forall a. a -> m a
forall (m :: * -> *) a. Monad m => a -> m a
return (SimpleLicenseExpression -> m SimpleLicenseExpression)
-> (LicenseRef -> SimpleLicenseExpression)
-> LicenseRef
-> m SimpleLicenseExpression
forall b c a. (b -> c) -> (a -> b) -> a -> c
. LicenseRef -> SimpleLicenseExpression
ELicenseRef) (Maybe LicenseRef -> m SimpleLicenseExpression)
-> Maybe LicenseRef -> m SimpleLicenseExpression
forall a b. (a -> b) -> a -> b
$ Maybe String -> String -> Maybe LicenseRef
mkLicenseRef Maybe String
forall a. Maybe a
Nothing String
l
        | Just String
d <- String
"DocumentRef-" String -> String -> Maybe String
forall a. Eq a => [a] -> [a] -> Maybe [a]
`isPrefixOfMaybe` String
n = do
            String
_ <- String -> m String
forall (m :: * -> *). CharParsing m => String -> m String
P.string String
":LicenseRef-"
            String
l <- m String
forall (m :: * -> *). CharParsing m => m String
idstring
            m SimpleLicenseExpression
-> (LicenseRef -> m SimpleLicenseExpression)
-> Maybe LicenseRef
-> m SimpleLicenseExpression
forall b a. b -> (a -> b) -> Maybe a -> b
maybe (String -> m SimpleLicenseExpression
forall a. String -> m a
forall (m :: * -> *) a. MonadFail m => String -> m a
fail (String -> m SimpleLicenseExpression)
-> String -> m SimpleLicenseExpression
forall a b. (a -> b) -> a -> b
$ String
"Incorrect LicenseRef format:" String -> ShowS
forall a. [a] -> [a] -> [a]
++ String
n) (SimpleLicenseExpression -> m SimpleLicenseExpression
forall a. a -> m a
forall (m :: * -> *) a. Monad m => a -> m a
return (SimpleLicenseExpression -> m SimpleLicenseExpression)
-> (LicenseRef -> SimpleLicenseExpression)
-> LicenseRef
-> m SimpleLicenseExpression
forall b c a. (b -> c) -> (a -> b) -> a -> c
. LicenseRef -> SimpleLicenseExpression
ELicenseRef) (Maybe LicenseRef -> m SimpleLicenseExpression)
-> Maybe LicenseRef -> m SimpleLicenseExpression
forall a b. (a -> b) -> a -> b
$ Maybe String -> String -> Maybe LicenseRef
mkLicenseRef (String -> Maybe String
forall a. a -> Maybe a
Just String
d) String
l
        | Bool
otherwise = do
            CabalSpecVersion
v <- m CabalSpecVersion
forall (m :: * -> *). CabalParsing m => m CabalSpecVersion
askCabalSpecVersion
            LicenseId
l <-
              m LicenseId
-> (LicenseId -> m LicenseId) -> Maybe LicenseId -> m LicenseId
forall b a. b -> (a -> b) -> Maybe a -> b
maybe (String -> m LicenseId
forall a. String -> m a
forall (m :: * -> *) a. MonadFail m => String -> m a
fail (String -> m LicenseId) -> String -> m LicenseId
forall a b. (a -> b) -> a -> b
$ String
"Unknown SPDX license identifier: '" String -> ShowS
forall a. [a] -> [a] -> [a]
++ String
n String -> ShowS
forall a. [a] -> [a] -> [a]
++ String
"' " String -> ShowS
forall a. [a] -> [a] -> [a]
++ ShowS
licenseIdMigrationMessage String
n) LicenseId -> m LicenseId
forall a. a -> m a
forall (m :: * -> *) a. Monad m => a -> m a
return (Maybe LicenseId -> m LicenseId) -> Maybe LicenseId -> m LicenseId
forall a b. (a -> b) -> a -> b
$
                LicenseListVersion -> String -> Maybe LicenseId
mkLicenseId (CabalSpecVersion -> LicenseListVersion
cabalSpecVersionToSPDXListVersion CabalSpecVersion
v) String
n
            Bool
orLater <- Maybe Char -> Bool
forall a. Maybe a -> Bool
isJust (Maybe Char -> Bool) -> m (Maybe Char) -> m Bool
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> m Char -> m (Maybe Char)
forall (f :: * -> *) a. Alternative f => f a -> f (Maybe a)
P.optional (Char -> m Char
forall (m :: * -> *). CharParsing m => Char -> m Char
P.char Char
'+')
            if Bool
orLater
              then SimpleLicenseExpression -> m SimpleLicenseExpression
forall a. a -> m a
forall (m :: * -> *) a. Monad m => a -> m a
return (LicenseId -> SimpleLicenseExpression
ELicenseIdPlus LicenseId
l)
              else SimpleLicenseExpression -> m SimpleLicenseExpression
forall a. a -> m a
forall (m :: * -> *) a. Monad m => a -> m a
return (LicenseId -> SimpleLicenseExpression
ELicenseId LicenseId
l)

idstring :: P.CharParsing m => m String
idstring :: forall (m :: * -> *). CharParsing m => m String
idstring = (Char -> Bool) -> m String
forall (m :: * -> *). CharParsing m => (Char -> Bool) -> m String
P.munch1 ((Char -> Bool) -> m String) -> (Char -> Bool) -> m String
forall a b. (a -> b) -> a -> b
$ \Char
c -> Char -> Bool
isAsciiAlphaNum Char
c Bool -> Bool -> Bool
|| Char
c Char -> Char -> Bool
forall a. Eq a => a -> a -> Bool
== Char
'-' Bool -> Bool -> Bool
|| Char
c Char -> Char -> Bool
forall a. Eq a => a -> a -> Bool
== Char
'.'

-- returns suffix part
isPrefixOfMaybe :: Eq a => [a] -> [a] -> Maybe [a]
isPrefixOfMaybe :: forall a. Eq a => [a] -> [a] -> Maybe [a]
isPrefixOfMaybe [a]
pfx [a]
s
  | [a]
pfx [a] -> [a] -> Bool
forall a. Eq a => [a] -> [a] -> Bool
`isPrefixOf` [a]
s = [a] -> Maybe [a]
forall a. a -> Maybe a
Just (Int -> [a] -> [a]
forall a. Int -> [a] -> [a]
drop ([a] -> Int
forall a. [a] -> Int
forall (t :: * -> *) a. Foldable t => t a -> Int
length [a]
pfx) [a]
s)
  | Bool
otherwise = Maybe [a]
forall a. Maybe a
Nothing

instance Parsec LicenseExpression where
  parsec :: forall (m :: * -> *). CabalParsing m => m LicenseExpression
parsec = m LicenseExpression
expr
    where
      expr :: m LicenseExpression
expr = m LicenseExpression
compoundOr

      simple :: m LicenseExpression
simple = do
        SimpleLicenseExpression
s <- m SimpleLicenseExpression
forall a (m :: * -> *). (Parsec a, CabalParsing m) => m a
forall (m :: * -> *). CabalParsing m => m SimpleLicenseExpression
parsec
        Maybe LicenseExceptionId
exc <- m (Maybe LicenseExceptionId)
exception
        LicenseExpression -> m LicenseExpression
forall a. a -> m a
forall (m :: * -> *) a. Monad m => a -> m a
return (LicenseExpression -> m LicenseExpression)
-> LicenseExpression -> m LicenseExpression
forall a b. (a -> b) -> a -> b
$ SimpleLicenseExpression
-> Maybe LicenseExceptionId -> LicenseExpression
ELicense SimpleLicenseExpression
s Maybe LicenseExceptionId
exc

      exception :: m (Maybe LicenseExceptionId)
exception = m LicenseExceptionId -> m (Maybe LicenseExceptionId)
forall (f :: * -> *) a. Alternative f => f a -> f (Maybe a)
P.optional (m LicenseExceptionId -> m (Maybe LicenseExceptionId))
-> m LicenseExceptionId -> m (Maybe LicenseExceptionId)
forall a b. (a -> b) -> a -> b
$ m () -> m ()
forall a. m a -> m a
forall (m :: * -> *) a. Parsing m => m a -> m a
P.try (m ()
spaces1 m () -> m String -> m String
forall a b. m a -> m b -> m b
forall (f :: * -> *) a b. Applicative f => f a -> f b -> f b
*> String -> m String
forall (m :: * -> *). CharParsing m => String -> m String
P.string String
"WITH" m String -> m () -> m ()
forall a b. m a -> m b -> m b
forall (f :: * -> *) a b. Applicative f => f a -> f b -> f b
*> m ()
spaces1) m () -> m LicenseExceptionId -> m LicenseExceptionId
forall a b. m a -> m b -> m b
forall (f :: * -> *) a b. Applicative f => f a -> f b -> f b
*> m LicenseExceptionId
forall a (m :: * -> *). (Parsec a, CabalParsing m) => m a
forall (m :: * -> *). CabalParsing m => m LicenseExceptionId
parsec

      compoundOr :: m LicenseExpression
compoundOr = do
        LicenseExpression
x <- m LicenseExpression
compoundAnd
        Maybe LicenseExpression
l <- m LicenseExpression -> m (Maybe LicenseExpression)
forall (f :: * -> *) a. Alternative f => f a -> f (Maybe a)
P.optional (m LicenseExpression -> m (Maybe LicenseExpression))
-> m LicenseExpression -> m (Maybe LicenseExpression)
forall a b. (a -> b) -> a -> b
$ m () -> m ()
forall a. m a -> m a
forall (m :: * -> *) a. Parsing m => m a -> m a
P.try (m ()
spaces1 m () -> m String -> m String
forall a b. m a -> m b -> m b
forall (f :: * -> *) a b. Applicative f => f a -> f b -> f b
*> String -> m String
forall (m :: * -> *). CharParsing m => String -> m String
P.string String
"OR" m String -> m () -> m ()
forall a b. m a -> m b -> m b
forall (f :: * -> *) a b. Applicative f => f a -> f b -> f b
*> m ()
spaces1) m () -> m LicenseExpression -> m LicenseExpression
forall a b. m a -> m b -> m b
forall (f :: * -> *) a b. Applicative f => f a -> f b -> f b
*> m LicenseExpression
compoundOr
        LicenseExpression -> m LicenseExpression
forall a. a -> m a
forall (m :: * -> *) a. Monad m => a -> m a
return (LicenseExpression -> m LicenseExpression)
-> LicenseExpression -> m LicenseExpression
forall a b. (a -> b) -> a -> b
$ (LicenseExpression -> LicenseExpression)
-> (LicenseExpression -> LicenseExpression -> LicenseExpression)
-> Maybe LicenseExpression
-> LicenseExpression
-> LicenseExpression
forall b a. b -> (a -> b) -> Maybe a -> b
maybe LicenseExpression -> LicenseExpression
forall a. a -> a
id ((LicenseExpression -> LicenseExpression -> LicenseExpression)
-> LicenseExpression -> LicenseExpression -> LicenseExpression
forall a b c. (a -> b -> c) -> b -> a -> c
flip LicenseExpression -> LicenseExpression -> LicenseExpression
EOr) Maybe LicenseExpression
l LicenseExpression
x

      compoundAnd :: m LicenseExpression
compoundAnd = do
        LicenseExpression
x <- m LicenseExpression
compound
        Maybe LicenseExpression
l <- m LicenseExpression -> m (Maybe LicenseExpression)
forall (f :: * -> *) a. Alternative f => f a -> f (Maybe a)
P.optional (m LicenseExpression -> m (Maybe LicenseExpression))
-> m LicenseExpression -> m (Maybe LicenseExpression)
forall a b. (a -> b) -> a -> b
$ m () -> m ()
forall a. m a -> m a
forall (m :: * -> *) a. Parsing m => m a -> m a
P.try (m ()
spaces1 m () -> m String -> m String
forall a b. m a -> m b -> m b
forall (f :: * -> *) a b. Applicative f => f a -> f b -> f b
*> String -> m String
forall (m :: * -> *). CharParsing m => String -> m String
P.string String
"AND" m String -> m () -> m ()
forall a b. m a -> m b -> m b
forall (f :: * -> *) a b. Applicative f => f a -> f b -> f b
*> m ()
spaces1) m () -> m LicenseExpression -> m LicenseExpression
forall a b. m a -> m b -> m b
forall (f :: * -> *) a b. Applicative f => f a -> f b -> f b
*> m LicenseExpression
compoundAnd
        LicenseExpression -> m LicenseExpression
forall a. a -> m a
forall (m :: * -> *) a. Monad m => a -> m a
return (LicenseExpression -> m LicenseExpression)
-> LicenseExpression -> m LicenseExpression
forall a b. (a -> b) -> a -> b
$ (LicenseExpression -> LicenseExpression)
-> (LicenseExpression -> LicenseExpression -> LicenseExpression)
-> Maybe LicenseExpression
-> LicenseExpression
-> LicenseExpression
forall b a. b -> (a -> b) -> Maybe a -> b
maybe LicenseExpression -> LicenseExpression
forall a. a -> a
id ((LicenseExpression -> LicenseExpression -> LicenseExpression)
-> LicenseExpression -> LicenseExpression -> LicenseExpression
forall a b c. (a -> b -> c) -> b -> a -> c
flip LicenseExpression -> LicenseExpression -> LicenseExpression
EAnd) Maybe LicenseExpression
l LicenseExpression
x

      compound :: m LicenseExpression
compound = m LicenseExpression
braces m LicenseExpression -> m LicenseExpression -> m LicenseExpression
forall a. m a -> m a -> m a
forall (f :: * -> *) a. Alternative f => f a -> f a -> f a
<|> m LicenseExpression
simple

      -- NOTE: we require that there's a space around AND & OR operators,
      -- i.e. @(MIT)AND(MIT)@ will cause parse-error.
      braces :: m LicenseExpression
braces = do
        Char
_ <- Char -> m Char
forall (m :: * -> *). CharParsing m => Char -> m Char
P.char Char
'('
        ()
_ <- m ()
forall (m :: * -> *). CharParsing m => m ()
P.spaces
        LicenseExpression
x <- m LicenseExpression
expr
        Char
_ <- Char -> m Char
forall (m :: * -> *). CharParsing m => Char -> m Char
P.char Char
')'
        LicenseExpression -> m LicenseExpression
forall a. a -> m a
forall (m :: * -> *) a. Monad m => a -> m a
return LicenseExpression
x

      spaces1 :: m ()
spaces1 = m Char
forall (m :: * -> *). CharParsing m => m Char
P.space m Char -> m () -> m ()
forall a b. m a -> m b -> m b
forall (f :: * -> *) a b. Applicative f => f a -> f b -> f b
*> m ()
forall (m :: * -> *). CharParsing m => m ()
P.spaces

-- notes:
--
-- There MUST NOT be whitespace between a license­id and any following "+".  This supports easy parsing and
-- backwards compatibility.  There MUST be whitespace on either side of the operator "WITH".  There MUST be
-- whitespace and/or parentheses on either side of the operators "AND" and "OR".
--
-- We handle that by having greedy 'idstring' parser, so MITAND would parse as invalid license identifier.

instance NFData LicenseExpression where
  rnf :: LicenseExpression -> ()
rnf (ELicense SimpleLicenseExpression
s Maybe LicenseExceptionId
e) = SimpleLicenseExpression -> ()
forall a. NFData a => a -> ()
rnf SimpleLicenseExpression
s () -> () -> ()
forall a b. a -> b -> b
`seq` Maybe LicenseExceptionId -> ()
forall a. NFData a => a -> ()
rnf Maybe LicenseExceptionId
e
  rnf (EAnd LicenseExpression
x LicenseExpression
y) = LicenseExpression -> ()
forall a. NFData a => a -> ()
rnf LicenseExpression
x () -> () -> ()
forall a b. a -> b -> b
`seq` LicenseExpression -> ()
forall a. NFData a => a -> ()
rnf LicenseExpression
y
  rnf (EOr LicenseExpression
x LicenseExpression
y) = LicenseExpression -> ()
forall a. NFData a => a -> ()
rnf LicenseExpression
x () -> () -> ()
forall a b. a -> b -> b
`seq` LicenseExpression -> ()
forall a. NFData a => a -> ()
rnf LicenseExpression
y

instance NFData SimpleLicenseExpression where
  rnf :: SimpleLicenseExpression -> ()
rnf (ELicenseId LicenseId
i) = LicenseId -> ()
forall a. NFData a => a -> ()
rnf LicenseId
i
  rnf (ELicenseIdPlus LicenseId
i) = LicenseId -> ()
forall a. NFData a => a -> ()
rnf LicenseId
i
  rnf (ELicenseRef LicenseRef
r) = LicenseRef -> ()
forall a. NFData a => a -> ()
rnf LicenseRef
r