Safe Haskell	None
Language	Haskell2010

Distribution.Types.CondTree

Synopsis

data CondTree v c a = CondNode {
- condTreeData :: a
- condTreeConstraints :: c
- condTreeComponents :: [CondBranch v c a]
}
data CondBranch v c a = CondBranch {
- condBranchCondition :: Condition v
- condBranchIfTrue :: CondTree v c a
- condBranchIfFalse :: Maybe (CondTree v c a)
}
condIfThen :: Condition v -> CondTree v c a -> CondBranch v c a
condIfThenElse :: Condition v -> CondTree v c a -> CondTree v c a -> CondBranch v c a
mapCondTree :: (a -> b) -> (c -> d) -> (Condition v -> Condition w) -> CondTree v c a -> CondTree w d b
mapTreeConstrs :: (c -> d) -> CondTree v c a -> CondTree v d a
mapTreeConds :: (Condition v -> Condition w) -> CondTree v c a -> CondTree w c a
mapTreeData :: (a -> b) -> CondTree v c a -> CondTree v c b
traverseCondTreeV :: Traversal (CondTree v c a) (CondTree w c a) v w
traverseCondBranchV :: Traversal (CondBranch v c a) (CondBranch w c a) v w
traverseCondTreeC :: Traversal (CondTree v c a) (CondTree v d a) c d
traverseCondBranchC :: Traversal (CondBranch v c a) (CondBranch v d a) c d
extractCondition :: Eq v => (a -> Bool) -> CondTree v c a -> Condition v
simplifyCondTree :: (Monoid a, Monoid d) => (v -> Either v Bool) -> CondTree v d a -> (d, a)
ignoreConditions :: (Monoid a, Monoid c) => CondTree v c a -> (a, c)

Documentation

data CondTree v c a #

A CondTree is used to represent the conditional structure of a Cabal file, reflecting a syntax element subject to constraints, and then any number of sub-elements which may be enabled subject to some condition. Both a and c are usually Monoids.

To be more concrete, consider the following fragment of a Cabal file:

build-depends: base >= 4.0
if flag(extra)
    build-depends: base >= 4.2

One way to represent this is to have CondTree ConfVar [Dependency] BuildInfo. Here, condTreeData represents the actual fields which are not behind any conditional, while condTreeComponents recursively records any further fields which are behind a conditional. condTreeConstraints records the constraints (in this case, base >= 4.0) which would be applied if you use this syntax; in general, this is derived off of targetBuildInfo (perhaps a good refactoring would be to convert this into an opaque type, with a smart constructor that pre-computes the dependencies.)

Constructors

CondNode
Fields condTreeData :: a condTreeConstraints :: c condTreeComponents :: [CondBranch v c a]

Instances

Functor (CondTree v c) #
Instance details Defined in Distribution.Types.CondTree Methods fmap :: (a -> b) -> CondTree v c a -> CondTree v c b # (<$) :: a -> CondTree v c b -> CondTree v c a #
Foldable (CondTree v c) #
Instance details Defined in Distribution.Types.CondTree Methods fold :: Monoid m => CondTree v c m -> m # foldMap :: Monoid m => (a -> m) -> CondTree v c a -> m # foldr :: (a -> b -> b) -> b -> CondTree v c a -> b # foldr' :: (a -> b -> b) -> b -> CondTree v c a -> b # foldl :: (b -> a -> b) -> b -> CondTree v c a -> b # foldl' :: (b -> a -> b) -> b -> CondTree v c a -> b # foldr1 :: (a -> a -> a) -> CondTree v c a -> a # foldl1 :: (a -> a -> a) -> CondTree v c a -> a # toList :: CondTree v c a -> [a] # null :: CondTree v c a -> Bool # length :: CondTree v c a -> Int # elem :: Eq a => a -> CondTree v c a -> Bool # maximum :: Ord a => CondTree v c a -> a # minimum :: Ord a => CondTree v c a -> a # sum :: Num a => CondTree v c a -> a # product :: Num a => CondTree v c a -> a #
Traversable (CondTree v c) #
Instance details Defined in Distribution.Types.CondTree Methods traverse :: Applicative f => (a -> f b) -> CondTree v c a -> f (CondTree v c b) # sequenceA :: Applicative f => CondTree v c (f a) -> f (CondTree v c a) # mapM :: Monad m => (a -> m b) -> CondTree v c a -> m (CondTree v c b) # sequence :: Monad m => CondTree v c (m a) -> m (CondTree v c a) #
(Eq a, Eq c, Eq v) => Eq (CondTree v c a) #
Instance details Defined in Distribution.Types.CondTree Methods (==) :: CondTree v c a -> CondTree v c a -> Bool # (/=) :: CondTree v c a -> CondTree v c a -> Bool #
(Data v, Data c, Data a) => Data (CondTree v c a) #
Instance details Defined in Distribution.Types.CondTree Methods gfoldl :: (forall d b. Data d => c0 (d -> b) -> d -> c0 b) -> (forall g. g -> c0 g) -> CondTree v c a -> c0 (CondTree v c a) # gunfold :: (forall b r. Data b => c0 (b -> r) -> c0 r) -> (forall r. r -> c0 r) -> Constr -> c0 (CondTree v c a) # toConstr :: CondTree v c a -> Constr # dataTypeOf :: CondTree v c a -> DataType # dataCast1 :: Typeable t => (forall d. Data d => c0 (t d)) -> Maybe (c0 (CondTree v c a)) # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c0 (t d e)) -> Maybe (c0 (CondTree v c a)) # gmapT :: (forall b. Data b => b -> b) -> CondTree v c a -> CondTree v c a # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> CondTree v c a -> r # gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> CondTree v c a -> r # gmapQ :: (forall d. Data d => d -> u) -> CondTree v c a -> [u] # gmapQi :: Int -> (forall d. Data d => d -> u) -> CondTree v c a -> u # gmapM :: Monad m => (forall d. Data d => d -> m d) -> CondTree v c a -> m (CondTree v c a) # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> CondTree v c a -> m (CondTree v c a) # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> CondTree v c a -> m (CondTree v c a) #
(Show a, Show c, Show v) => Show (CondTree v c a) #
Instance details Defined in Distribution.Types.CondTree Methods showsPrec :: Int -> CondTree v c a -> ShowS # show :: CondTree v c a -> String # showList :: [CondTree v c a] -> ShowS #
Generic (CondTree v c a) #
Instance details Defined in Distribution.Types.CondTree Associated Types type Rep (CondTree v c a) :: * -> * # Methods from :: CondTree v c a -> Rep (CondTree v c a) x # to :: Rep (CondTree v c a) x -> CondTree v c a #
(Binary v, Binary c, Binary a) => Binary (CondTree v c a) #
Instance details Defined in Distribution.Types.CondTree Methods put :: CondTree v c a -> Put # get :: Get (CondTree v c a) # putList :: [CondTree v c a] -> Put #
(NFData v, NFData c, NFData a) => NFData (CondTree v c a) #
Instance details Defined in Distribution.Types.CondTree Methods rnf :: CondTree v c a -> () #
type Rep (CondTree v c a) #
Instance details Defined in Distribution.Types.CondTree type Rep (CondTree v c a) = D1 (MetaData "CondTree" "Distribution.Types.CondTree" "Cabal-2.4.0.0-8En9aDn0HOVDVTKXJjqCyH" False) (C1 (MetaCons "CondNode" PrefixI True) (S1 (MetaSel (Just "condTreeData") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 a) :: (S1 (MetaSel (Just "condTreeConstraints") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 c) :: S1 (MetaSel (Just "condTreeComponents") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 [CondBranch v c a]))))

data CondBranch v c a #

A CondBranch represents a conditional branch, e.g., if flag(foo) on some syntax a. It also has an optional false branch.

Constructors

CondBranch
Fields condBranchCondition :: Condition v condBranchIfTrue :: CondTree v c a condBranchIfFalse :: Maybe (CondTree v c a)

Instances

Functor (CondBranch v c) #
Instance details Defined in Distribution.Types.CondTree Methods fmap :: (a -> b) -> CondBranch v c a -> CondBranch v c b # (<$) :: a -> CondBranch v c b -> CondBranch v c a #
Foldable (CondBranch v c) #
Instance details Defined in Distribution.Types.CondTree Methods fold :: Monoid m => CondBranch v c m -> m # foldMap :: Monoid m => (a -> m) -> CondBranch v c a -> m # foldr :: (a -> b -> b) -> b -> CondBranch v c a -> b # foldr' :: (a -> b -> b) -> b -> CondBranch v c a -> b # foldl :: (b -> a -> b) -> b -> CondBranch v c a -> b # foldl' :: (b -> a -> b) -> b -> CondBranch v c a -> b # foldr1 :: (a -> a -> a) -> CondBranch v c a -> a # foldl1 :: (a -> a -> a) -> CondBranch v c a -> a # toList :: CondBranch v c a -> [a] # null :: CondBranch v c a -> Bool # length :: CondBranch v c a -> Int # elem :: Eq a => a -> CondBranch v c a -> Bool # maximum :: Ord a => CondBranch v c a -> a # minimum :: Ord a => CondBranch v c a -> a # sum :: Num a => CondBranch v c a -> a # product :: Num a => CondBranch v c a -> a #
Traversable (CondBranch v c) #
Instance details Defined in Distribution.Types.CondTree Methods traverse :: Applicative f => (a -> f b) -> CondBranch v c a -> f (CondBranch v c b) # sequenceA :: Applicative f => CondBranch v c (f a) -> f (CondBranch v c a) # mapM :: Monad m => (a -> m b) -> CondBranch v c a -> m (CondBranch v c b) # sequence :: Monad m => CondBranch v c (m a) -> m (CondBranch v c a) #
(Eq v, Eq a, Eq c) => Eq (CondBranch v c a) #
Instance details Defined in Distribution.Types.CondTree Methods (==) :: CondBranch v c a -> CondBranch v c a -> Bool # (/=) :: CondBranch v c a -> CondBranch v c a -> Bool #
(Data v, Data c, Data a) => Data (CondBranch v c a) #
Instance details Defined in Distribution.Types.CondTree Methods gfoldl :: (forall d b. Data d => c0 (d -> b) -> d -> c0 b) -> (forall g. g -> c0 g) -> CondBranch v c a -> c0 (CondBranch v c a) # gunfold :: (forall b r. Data b => c0 (b -> r) -> c0 r) -> (forall r. r -> c0 r) -> Constr -> c0 (CondBranch v c a) # toConstr :: CondBranch v c a -> Constr # dataTypeOf :: CondBranch v c a -> DataType # dataCast1 :: Typeable t => (forall d. Data d => c0 (t d)) -> Maybe (c0 (CondBranch v c a)) # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c0 (t d e)) -> Maybe (c0 (CondBranch v c a)) # gmapT :: (forall b. Data b => b -> b) -> CondBranch v c a -> CondBranch v c a # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> CondBranch v c a -> r # gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> CondBranch v c a -> r # gmapQ :: (forall d. Data d => d -> u) -> CondBranch v c a -> [u] # gmapQi :: Int -> (forall d. Data d => d -> u) -> CondBranch v c a -> u # gmapM :: Monad m => (forall d. Data d => d -> m d) -> CondBranch v c a -> m (CondBranch v c a) # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> CondBranch v c a -> m (CondBranch v c a) # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> CondBranch v c a -> m (CondBranch v c a) #
(Show v, Show a, Show c) => Show (CondBranch v c a) #
Instance details Defined in Distribution.Types.CondTree Methods showsPrec :: Int -> CondBranch v c a -> ShowS # show :: CondBranch v c a -> String # showList :: [CondBranch v c a] -> ShowS #
Generic (CondBranch v c a) #
Instance details Defined in Distribution.Types.CondTree Associated Types type Rep (CondBranch v c a) :: * -> * # Methods from :: CondBranch v c a -> Rep (CondBranch v c a) x # to :: Rep (CondBranch v c a) x -> CondBranch v c a #
(Binary v, Binary c, Binary a) => Binary (CondBranch v c a) #
Instance details Defined in Distribution.Types.CondTree Methods put :: CondBranch v c a -> Put # get :: Get (CondBranch v c a) # putList :: [CondBranch v c a] -> Put #
(NFData v, NFData c, NFData a) => NFData (CondBranch v c a) #
Instance details Defined in Distribution.Types.CondTree Methods rnf :: CondBranch v c a -> () #
type Rep (CondBranch v c a) #
Instance details Defined in Distribution.Types.CondTree type Rep (CondBranch v c a) = D1 (MetaData "CondBranch" "Distribution.Types.CondTree" "Cabal-2.4.0.0-8En9aDn0HOVDVTKXJjqCyH" False) (C1 (MetaCons "CondBranch" PrefixI True) (S1 (MetaSel (Just "condBranchCondition") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 (Condition v)) :: (S1 (MetaSel (Just "condBranchIfTrue") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 (CondTree v c a)) :: S1 (MetaSel (Just "condBranchIfFalse") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 (Maybe (CondTree v c a))))))

condIfThen :: Condition v -> CondTree v c a -> CondBranch v c a #

condIfThenElse :: Condition v -> CondTree v c a -> CondTree v c a -> CondBranch v c a #

mapCondTree :: (a -> b) -> (c -> d) -> (Condition v -> Condition w) -> CondTree v c a -> CondTree w d b #

mapTreeConstrs :: (c -> d) -> CondTree v c a -> CondTree v d a #

mapTreeConds :: (Condition v -> Condition w) -> CondTree v c a -> CondTree w c a #

mapTreeData :: (a -> b) -> CondTree v c a -> CondTree v c b #

traverseCondTreeV :: Traversal (CondTree v c a) (CondTree w c a) v w #

@Traversal@ for the variables

traverseCondBranchV :: Traversal (CondBranch v c a) (CondBranch w c a) v w #

@Traversal@ for the variables

traverseCondTreeC :: Traversal (CondTree v c a) (CondTree v d a) c d #

@Traversal@ for the aggregated constraints

traverseCondBranchC :: Traversal (CondBranch v c a) (CondBranch v d a) c d #

@Traversal@ for the aggregated constraints

extractCondition :: Eq v => (a -> Bool) -> CondTree v c a -> Condition v #

Extract the condition matched by the given predicate from a cond tree.

We use this mainly for extracting buildable conditions (see the Note above), but the function is in fact more general.

simplifyCondTree :: (Monoid a, Monoid d) => (v -> Either v Bool) -> CondTree v d a -> (d, a) #

Flattens a CondTree using a partial flag assignment. When a condition cannot be evaluated, both branches are ignored.

ignoreConditions :: (Monoid a, Monoid c) => CondTree v c a -> (a, c) #

Flatten a CondTree. This will resolve the CondTree by taking all possible paths into account. Note that since branches represent exclusive choices this may not result in a "sane" result.