Cabal-2.0.1.0: A framework for packaging Haskell software

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 :: Applicative f => (v -> f w) -> CondTree v c a -> f (CondTree w c a)
- traverseCondBranchV :: Applicative f => (v -> f w) -> CondBranch v c a -> f (CondBranch w c a)
- 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 `Monoid`s.

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) # |
Methods fmap :: (a -> b) -> CondTree v c a -> CondTree v c b Source # (<$) :: a -> CondTree v c b -> CondTree v c a Source #
Foldable (CondTree v c) # |

Methods

fold :: Monoid m => CondTree v c m -> m Source #

foldMap :: Monoid m => (a -> m) -> CondTree v c a -> m Source #

foldr :: (a -> b -> b) -> b -> CondTree v c a -> b Source #

foldr' :: (a -> b -> b) -> b -> CondTree v c a -> b Source #

foldl :: (b -> a -> b) -> b -> CondTree v c a -> b Source #

foldl' :: (b -> a -> b) -> b -> CondTree v c a -> b Source #

foldr1 :: (a -> a -> a) -> CondTree v c a -> a Source #

foldl1 :: (a -> a -> a) -> CondTree v c a -> a Source #

toList :: CondTree v c a -> [a] Source #

null :: CondTree v c a -> Bool Source #

length :: CondTree v c a -> Int Source #

elem :: Eq a => a -> CondTree v c a -> Bool Source #

maximum :: Ord a => CondTree v c a -> a Source #

minimum :: Ord a => CondTree v c a -> a Source #

sum :: Num a => CondTree v c a -> a Source #

product :: Num a => CondTree v c a -> a Source #

Traversable (CondTree v c) # |
Methods traverse :: Applicative f => (a -> f b) -> CondTree v c a -> f (CondTree v c b) Source # sequenceA :: Applicative f => CondTree v c (f a) -> f (CondTree v c a) Source # mapM :: Monad m => (a -> m b) -> CondTree v c a -> m (CondTree v c b) Source # sequence :: Monad m => CondTree v c (m a) -> m (CondTree v c a) Source #
(Eq v, Eq c, Eq a) => Eq (CondTree v c a) # |
Methods (==) :: CondTree v c a -> CondTree v c a -> Bool # (/=) :: CondTree v c a -> CondTree v c a -> Bool #
(Data a, Data c, Data v) => Data (CondTree v c a) # |

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> CondTree v c a -> c (CondTree v c a) Source #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (CondTree v c a) Source #

toConstr :: CondTree v c a -> Constr Source #

dataTypeOf :: CondTree v c a -> DataType Source #

dataCast1 :: Typeable (* -> *) t => (forall d. Data d => c (t d)) -> Maybe (c (CondTree v c a)) Source #

dataCast2 :: Typeable (* -> * -> *) t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c (CondTree v c a)) Source #

gmapT :: (forall b. Data b => b -> b) -> CondTree v c a -> CondTree v c a Source #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> CondTree v c a -> r Source #

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> CondTree v c a -> r Source #

gmapQ :: (forall d. Data d => d -> u) -> CondTree v c a -> [u] Source #

gmapQi :: Int -> (forall d. Data d => d -> u) -> CondTree v c a -> u Source #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> CondTree v c a -> m (CondTree v c a) Source #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> CondTree v c a -> m (CondTree v c a) Source #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> CondTree v c a -> m (CondTree v c a) Source #

(Show v, Show c, Show a) => Show (CondTree v c a) # |
Methods showsPrec :: Int -> CondTree v c a -> ShowS Source # show :: CondTree v c a -> String Source # showList :: [CondTree v c a] -> ShowS Source #
Generic (CondTree v c a) # |
Associated Types type Rep (CondTree v c a) :: * -> * Source # Methods from :: CondTree v c a -> Rep (CondTree v c a) x Source # to :: Rep (CondTree v c a) x -> CondTree v c a Source #
(Binary v, Binary c, Binary a) => Binary (CondTree v c a) # |
Methods put :: CondTree v c a -> Put Source # get :: Get (CondTree v c a) Source # putList :: [CondTree v c a] -> Put Source #
type Rep (CondTree v c a) # |

type Rep (CondTree v c a) = D1 * (MetaData "CondTree" "Distribution.Types.CondTree" "Cabal-2.0.1.0" False) (C1 * (MetaCons "CondNode" PrefixI True) ((:*:) * (S1 * (MetaSel (Just Symbol "condTreeData") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 * a)) ((:*:) * (S1 * (MetaSel (Just Symbol "condTreeConstraints") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 * c)) (S1 * (MetaSel (Just Symbol "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) # |
Methods fmap :: (a -> b) -> CondBranch v c a -> CondBranch v c b Source # (<$) :: a -> CondBranch v c b -> CondBranch v c a Source #
Foldable (CondBranch v c) # |

Methods

fold :: Monoid m => CondBranch v c m -> m Source #

foldMap :: Monoid m => (a -> m) -> CondBranch v c a -> m Source #

foldr :: (a -> b -> b) -> b -> CondBranch v c a -> b Source #

foldr' :: (a -> b -> b) -> b -> CondBranch v c a -> b Source #

foldl :: (b -> a -> b) -> b -> CondBranch v c a -> b Source #

foldl' :: (b -> a -> b) -> b -> CondBranch v c a -> b Source #

foldr1 :: (a -> a -> a) -> CondBranch v c a -> a Source #

foldl1 :: (a -> a -> a) -> CondBranch v c a -> a Source #

toList :: CondBranch v c a -> [a] Source #

null :: CondBranch v c a -> Bool Source #

length :: CondBranch v c a -> Int Source #

elem :: Eq a => a -> CondBranch v c a -> Bool Source #

maximum :: Ord a => CondBranch v c a -> a Source #

minimum :: Ord a => CondBranch v c a -> a Source #

sum :: Num a => CondBranch v c a -> a Source #

product :: Num a => CondBranch v c a -> a Source #

Traversable (CondBranch v c) # |
Methods traverse :: Applicative f => (a -> f b) -> CondBranch v c a -> f (CondBranch v c b) Source # sequenceA :: Applicative f => CondBranch v c (f a) -> f (CondBranch v c a) Source # mapM :: Monad m => (a -> m b) -> CondBranch v c a -> m (CondBranch v c b) Source # sequence :: Monad m => CondBranch v c (m a) -> m (CondBranch v c a) Source #
(Eq a, Eq c, Eq v) => Eq (CondBranch v c a) # |
Methods (==) :: CondBranch v c a -> CondBranch v c a -> Bool # (/=) :: CondBranch v c a -> CondBranch v c a -> Bool #
(Data a, Data c, Data v) => Data (CondBranch v c a) # |

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> CondBranch v c a -> c (CondBranch v c a) Source #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (CondBranch v c a) Source #

toConstr :: CondBranch v c a -> Constr Source #

dataTypeOf :: CondBranch v c a -> DataType Source #

dataCast1 :: Typeable (* -> *) t => (forall d. Data d => c (t d)) -> Maybe (c (CondBranch v c a)) Source #

dataCast2 :: Typeable (* -> * -> *) t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c (CondBranch v c a)) Source #

gmapT :: (forall b. Data b => b -> b) -> CondBranch v c a -> CondBranch v c a Source #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> CondBranch v c a -> r Source #

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> CondBranch v c a -> r Source #

gmapQ :: (forall d. Data d => d -> u) -> CondBranch v c a -> [u] Source #

gmapQi :: Int -> (forall d. Data d => d -> u) -> CondBranch v c a -> u Source #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> CondBranch v c a -> m (CondBranch v c a) Source #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> CondBranch v c a -> m (CondBranch v c a) Source #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> CondBranch v c a -> m (CondBranch v c a) Source #

(Show a, Show c, Show v) => Show (CondBranch v c a) # |
Methods showsPrec :: Int -> CondBranch v c a -> ShowS Source # show :: CondBranch v c a -> String Source # showList :: [CondBranch v c a] -> ShowS Source #
Generic (CondBranch v c a) # |
Associated Types type Rep (CondBranch v c a) :: * -> * Source # Methods from :: CondBranch v c a -> Rep (CondBranch v c a) x Source # to :: Rep (CondBranch v c a) x -> CondBranch v c a Source #
(Binary v, Binary c, Binary a) => Binary (CondBranch v c a) # |
Methods put :: CondBranch v c a -> Put Source # get :: Get (CondBranch v c a) Source # putList :: [CondBranch v c a] -> Put Source #
type Rep (CondBranch v c a) # |

type Rep (CondBranch v c a) = D1 * (MetaData "CondBranch" "Distribution.Types.CondTree" "Cabal-2.0.1.0" False) (C1 * (MetaCons "CondBranch" PrefixI True) ((:*:) * (S1 * (MetaSel (Just Symbol "condBranchCondition") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 * (Condition v))) ((:*:) * (S1 * (MetaSel (Just Symbol "condBranchIfTrue") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 * (CondTree v c a))) (S1 * (MetaSel (Just Symbol "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 :: Applicative f => (v -> f w) -> CondTree v c a -> f (CondTree w c a) #

    Traversal (CondTree v c a) (CondTree w c a) v w

traverseCondBranchV :: Applicative f => (v -> f w) -> CondBranch v c a -> f (CondBranch w c a) #

    Traversal (CondBranch v c a) (CondBranch w c a) v w

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.