Cabal-2.2.0.0: A framework for packaging Haskell software

CopyrightIsaac Jones Simon Marlow 2003-2004
Duncan Coutts 2008
LicenseBSD3
Maintainercabal-devel@haskell.org
Portabilityportable
Safe HaskellNone
LanguageHaskell2010

Distribution.Version

Contents

Description

Exports the Version type along with a parser and pretty printer. A version is something like "1.3.3". It also defines the VersionRange data types. Version ranges are like ">= 1.2 && < 2".

Synopsis

Package versions

data Version Source #

A Version represents the version of a software entity.

Instances of Eq and Ord are provided, which gives exact equality and lexicographic ordering of the version number components (i.e. 2.1 > 2.0, 1.2.3 > 1.2.2, etc.).

This type is opaque and distinct from the Version type in Data.Version since Cabal-2.0. The difference extends to the Binary instance using a different (and more compact) encoding.

Since: 2.0.0.2

Instances
Eq Version Source # 
Instance details

Methods

(==) :: Version -> Version -> Bool #

(/=) :: Version -> Version -> Bool #

Data Version Source # 
Instance details

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> Version -> c Version #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c Version #

toConstr :: Version -> Constr #

dataTypeOf :: Version -> DataType #

dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c Version) #

dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c Version) #

gmapT :: (forall b. Data b => b -> b) -> Version -> Version #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Version -> r #

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Version -> r #

gmapQ :: (forall d. Data d => d -> u) -> Version -> [u] #

gmapQi :: Int -> (forall d. Data d => d -> u) -> Version -> u #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> Version -> m Version #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Version -> m Version #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Version -> m Version #

Ord Version Source # 
Instance details
Read Version Source # 
Instance details
Show Version Source # 
Instance details
Generic Version Source # 
Instance details

Associated Types

type Rep Version :: * -> * #

Methods

from :: Version -> Rep Version x #

to :: Rep Version x -> Version #

Binary Version Source # 
Instance details

Methods

put :: Version -> Put #

get :: Get Version #

putList :: [Version] -> Put #

NFData Version Source # 
Instance details

Methods

rnf :: Version -> () #

Pretty Version Source # 
Instance details

Methods

pretty :: Version -> Doc Source #

Parsec Version Source # 
Instance details
Text Version Source # 
Instance details
Newtype SpecVersion (Either Version VersionRange) Source # 
Instance details
type Rep Version Source # 
Instance details

version0 :: Version Source #

Version 0. A lower bound of Version.

Since: 2.2

mkVersion :: [Int] -> Version Source #

Construct Version from list of version number components.

For instance, mkVersion [3,2,1] constructs a Version representing the version 3.2.1.

All version components must be non-negative. mkVersion [] currently represents the special null version; see also nullVersion.

Since: 2.0.0.2

mkVersion' :: Version -> Version Source #

Variant of Version which converts a Data.Version Version into Cabal's Version type.

Since: 2.0.0.2

versionNumbers :: Version -> [Int] Source #

Unpack Version into list of version number components.

This is the inverse to mkVersion, so the following holds:

(versionNumbers . mkVersion) vs == vs

Since: 2.0.0.2

nullVersion :: Version Source #

Constant representing the special null Version

The nullVersion compares (via Ord) as less than every proper Version value.

Since: 2.0.0.2

alterVersion :: ([Int] -> [Int]) -> Version -> Version Source #

Apply function to list of version number components

alterVersion f == mkVersion . f . versionNumbers

Since: 2.0.0.2

Backwards compatibility

showVersion :: Version -> String Source #

Deprecated: Use prettyShow. This function will be removed in Cabal-3.0 (estimated Oct 2018)

Version ranges

data VersionRange Source #

Instances
Eq VersionRange Source # 
Instance details
Data VersionRange Source # 
Instance details

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> VersionRange -> c VersionRange #

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c VersionRange #

toConstr :: VersionRange -> Constr #

dataTypeOf :: VersionRange -> DataType #

dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c VersionRange) #

dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c VersionRange) #

gmapT :: (forall b. Data b => b -> b) -> VersionRange -> VersionRange #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> VersionRange -> r #

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> VersionRange -> r #

gmapQ :: (forall d. Data d => d -> u) -> VersionRange -> [u] #

gmapQi :: Int -> (forall d. Data d => d -> u) -> VersionRange -> u #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> VersionRange -> m VersionRange #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> VersionRange -> m VersionRange #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> VersionRange -> m VersionRange #

Read VersionRange Source # 
Instance details
Show VersionRange Source # 
Instance details
Generic VersionRange Source # 
Instance details

Associated Types

type Rep VersionRange :: * -> * #

Binary VersionRange Source # 
Instance details
NFData VersionRange Source # 
Instance details

Methods

rnf :: VersionRange -> () #

Pretty VersionRange Source # 
Instance details
Parsec VersionRange Source # 
Instance details
Text VersionRange Source # 
Instance details
Newtype TestedWith (CompilerFlavor, VersionRange) Source # 
Instance details
Newtype SpecVersion (Either Version VersionRange) Source # 
Instance details
type Rep VersionRange Source # 
Instance details
type Rep VersionRange = D1 (MetaData "VersionRange" "Distribution.Types.VersionRange" "Cabal-2.2.0.0-inplace" False) (((C1 (MetaCons "AnyVersion" PrefixI False) (U1 :: * -> *) :+: C1 (MetaCons "ThisVersion" PrefixI False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 Version))) :+: (C1 (MetaCons "LaterVersion" PrefixI False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 Version)) :+: (C1 (MetaCons "OrLaterVersion" PrefixI False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 Version)) :+: C1 (MetaCons "EarlierVersion" PrefixI False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 Version))))) :+: ((C1 (MetaCons "OrEarlierVersion" PrefixI False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 Version)) :+: (C1 (MetaCons "WildcardVersion" PrefixI False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 Version)) :+: C1 (MetaCons "MajorBoundVersion" PrefixI False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 Version)))) :+: (C1 (MetaCons "UnionVersionRanges" PrefixI False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 VersionRange) :*: S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 VersionRange)) :+: (C1 (MetaCons "IntersectVersionRanges" PrefixI False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 VersionRange) :*: S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 VersionRange)) :+: C1 (MetaCons "VersionRangeParens" PrefixI False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 VersionRange))))))

Constructing

anyVersion :: VersionRange Source #

The version range -any. That is, a version range containing all versions.

withinRange v anyVersion = True

noVersion :: VersionRange Source #

The empty version range, that is a version range containing no versions.

This can be constructed using any unsatisfiable version range expression, for example > 1 && < 1.

withinRange v noVersion = False

thisVersion :: Version -> VersionRange Source #

The version range == v

withinRange v' (thisVersion v) = v' == v

notThisVersion :: Version -> VersionRange Source #

The version range || v

withinRange v' (notThisVersion v) = v' /= v

laterVersion :: Version -> VersionRange Source #

The version range > v

withinRange v' (laterVersion v) = v' > v

earlierVersion :: Version -> VersionRange Source #

The version range < v

withinRange v' (earlierVersion v) = v' < v

orLaterVersion :: Version -> VersionRange Source #

The version range >= v

withinRange v' (orLaterVersion v) = v' >= v

orEarlierVersion :: Version -> VersionRange Source #

The version range <= v

withinRange v' (orEarlierVersion v) = v' <= v

unionVersionRanges :: VersionRange -> VersionRange -> VersionRange Source #

The version range vr1 || vr2

  withinRange v' (unionVersionRanges vr1 vr2)
= withinRange v' vr1 || withinRange v' vr2

intersectVersionRanges :: VersionRange -> VersionRange -> VersionRange Source #

The version range vr1 && vr2

  withinRange v' (intersectVersionRanges vr1 vr2)
= withinRange v' vr1 && withinRange v' vr2

differenceVersionRanges :: VersionRange -> VersionRange -> VersionRange Source #

The difference of two version ranges

  withinRange v' (differenceVersionRanges vr1 vr2)
= withinRange v' vr1 && not (withinRange v' vr2)

Since: 1.24.1.0

invertVersionRange :: VersionRange -> VersionRange Source #

The inverse of a version range

  withinRange v' (invertVersionRange vr)
= not (withinRange v' vr)

withinVersion :: Version -> VersionRange Source #

The version range == v.*.

For example, for version 1.2, the version range == 1.2.* is the same as >= 1.2 && < 1.3

withinRange v' (laterVersion v) = v' >= v && v' < upper v
  where
    upper (Version lower t) = Version (init lower ++ [last lower + 1]) t

majorBoundVersion :: Version -> VersionRange Source #

The version range ^>= v.

For example, for version 1.2.3.4, the version range ^>= 1.2.3.4 is the same as >= 1.2.3.4 && < 1.3.

Note that ^>= 1 is equivalent to >= 1 && < 1.1.

Since: 2.0.0.2

betweenVersionsInclusive :: Version -> Version -> VersionRange Source #

Deprecated: In practice this is not very useful because we normally use inclusive lower bounds and exclusive upper bounds

Inspection

withinRange :: Version -> VersionRange -> Bool Source #

Does this version fall within the given range?

This is the evaluation function for the VersionRange type.

isAnyVersion :: VersionRange -> Bool Source #

Does this VersionRange place any restriction on the Version or is it in fact equivalent to AnyVersion.

Note this is a semantic check, not simply a syntactic check. So for example the following is True (for all v).

isAnyVersion (EarlierVersion v `UnionVersionRanges` orLaterVersion v)

isNoVersion :: VersionRange -> Bool Source #

This is the converse of isAnyVersion. It check if the version range is empty, if there is no possible version that satisfies the version range.

For example this is True (for all v):

isNoVersion (EarlierVersion v `IntersectVersionRanges` LaterVersion v)

isSpecificVersion :: VersionRange -> Maybe Version Source #

Is this version range in fact just a specific version?

For example the version range ">= 3 && <= 3" contains only the version 3.

simplifyVersionRange :: VersionRange -> VersionRange Source #

Simplify a VersionRange expression. For non-empty version ranges this produces a canonical form. Empty or inconsistent version ranges are left as-is because that provides more information.

If you need a canonical form use fromVersionIntervals . toVersionIntervals

It satisfies the following properties:

withinRange v (simplifyVersionRange r) = withinRange v r
    withinRange v r = withinRange v r'
==> simplifyVersionRange r = simplifyVersionRange r'
 || isNoVersion r
 || isNoVersion r'

foldVersionRange Source #

Arguments

:: a

"-any" version

-> (Version -> a)
"== v"
-> (Version -> a)
"> v"
-> (Version -> a)
"< v"
-> (a -> a -> a)

"_ || _" union

-> (a -> a -> a)

"_ && _" intersection

-> VersionRange 
-> a 

Fold over the basic syntactic structure of a VersionRange.

This provides a syntactic view of the expression defining the version range. The syntactic sugar ">= v", "<= v" and "== v.*" is presented in terms of the other basic syntax.

For a semantic view use asVersionIntervals.

foldVersionRange' Source #

Arguments

:: a

"-any" version

-> (Version -> a)
"== v"
-> (Version -> a)
"> v"
-> (Version -> a)
"< v"
-> (Version -> a)
">= v"
-> (Version -> a)
"<= v"
-> (Version -> Version -> a)

"== v.*" wildcard. The function is passed the inclusive lower bound and the exclusive upper bounds of the range defined by the wildcard.

-> (Version -> Version -> a)

"^>= v" major upper bound The function is passed the inclusive lower bound and the exclusive major upper bounds of the range defined by this operator.

-> (a -> a -> a)

"_ || _" union

-> (a -> a -> a)

"_ && _" intersection

-> (a -> a)

"(_)" parentheses

-> VersionRange 
-> a 

Deprecated: Use cataVersionRange & normaliseVersionRange for more principled folding

An extended variant of foldVersionRange that also provides a view of the expression in which the syntactic sugar ">= v", "<= v" and "== v.*" is presented explicitly rather than in terms of the other basic syntax.

normaliseVersionRange :: VersionRange -> VersionRange Source #

Normalise VersionRange.

In particular collapse (== v || > v) into >= v, and so on.

hasUpperBound :: VersionRange -> Bool Source #

Does the version range have an upper bound?

Since: 1.24.0.0

hasLowerBound :: VersionRange -> Bool Source #

Does the version range have an explicit lower bound?

Note: this function only considers the user-specified lower bounds, but not the implicit >=0 lower bound.

Since: 1.24.0.0

Cata & ana

data VersionRangeF a Source #

F-Algebra of VersionRange. See cataVersionRange.

Since: 2.2

Instances
Functor VersionRangeF Source # 
Instance details

Methods

fmap :: (a -> b) -> VersionRangeF a -> VersionRangeF b #

(<$) :: a -> VersionRangeF b -> VersionRangeF a #

Foldable VersionRangeF Source # 
Instance details

Methods

fold :: Monoid m => VersionRangeF m -> m #

foldMap :: Monoid m => (a -> m) -> VersionRangeF a -> m #

foldr :: (a -> b -> b) -> b -> VersionRangeF a -> b #

foldr' :: (a -> b -> b) -> b -> VersionRangeF a -> b #

foldl :: (b -> a -> b) -> b -> VersionRangeF a -> b #

foldl' :: (b -> a -> b) -> b -> VersionRangeF a -> b #

foldr1 :: (a -> a -> a) -> VersionRangeF a -> a #

foldl1 :: (a -> a -> a) -> VersionRangeF a -> a #

toList :: VersionRangeF a -> [a] #

null :: VersionRangeF a -> Bool #

length :: VersionRangeF a -> Int #

elem :: Eq a => a -> VersionRangeF a -> Bool #

maximum :: Ord a => VersionRangeF a -> a #

minimum :: Ord a => VersionRangeF a -> a #

sum :: Num a => VersionRangeF a -> a #

product :: Num a => VersionRangeF a -> a #

Traversable VersionRangeF Source # 
Instance details

Methods

traverse :: Applicative f => (a -> f b) -> VersionRangeF a -> f (VersionRangeF b) #

sequenceA :: Applicative f => VersionRangeF (f a) -> f (VersionRangeF a) #

mapM :: Monad m => (a -> m b) -> VersionRangeF a -> m (VersionRangeF b) #

sequence :: Monad m => VersionRangeF (m a) -> m (VersionRangeF a) #

Eq a => Eq (VersionRangeF a) Source # 
Instance details
Data a => Data (VersionRangeF a) Source # 
Instance details

Methods

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

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

toConstr :: VersionRangeF a -> Constr #

dataTypeOf :: VersionRangeF a -> DataType #

dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c (VersionRangeF a)) #

dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c (VersionRangeF a)) #

gmapT :: (forall b. Data b => b -> b) -> VersionRangeF a -> VersionRangeF a #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> VersionRangeF a -> r #

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> VersionRangeF a -> r #

gmapQ :: (forall d. Data d => d -> u) -> VersionRangeF a -> [u] #

gmapQi :: Int -> (forall d. Data d => d -> u) -> VersionRangeF a -> u #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> VersionRangeF a -> m (VersionRangeF a) #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> VersionRangeF a -> m (VersionRangeF a) #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> VersionRangeF a -> m (VersionRangeF a) #

Read a => Read (VersionRangeF a) Source # 
Instance details
Show a => Show (VersionRangeF a) Source # 
Instance details
Generic (VersionRangeF a) Source # 
Instance details

Associated Types

type Rep (VersionRangeF a) :: * -> * #

type Rep (VersionRangeF a) Source # 
Instance details
type Rep (VersionRangeF a) = D1 (MetaData "VersionRangeF" "Distribution.Types.VersionRange" "Cabal-2.2.0.0-inplace" False) (((C1 (MetaCons "AnyVersionF" PrefixI False) (U1 :: * -> *) :+: C1 (MetaCons "ThisVersionF" PrefixI False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 Version))) :+: (C1 (MetaCons "LaterVersionF" PrefixI False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 Version)) :+: (C1 (MetaCons "OrLaterVersionF" PrefixI False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 Version)) :+: C1 (MetaCons "EarlierVersionF" PrefixI False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 Version))))) :+: ((C1 (MetaCons "OrEarlierVersionF" PrefixI False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 Version)) :+: (C1 (MetaCons "WildcardVersionF" PrefixI False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 Version)) :+: C1 (MetaCons "MajorBoundVersionF" PrefixI False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 Version)))) :+: (C1 (MetaCons "UnionVersionRangesF" PrefixI False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 a) :*: S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 a)) :+: (C1 (MetaCons "IntersectVersionRangesF" PrefixI False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 a) :*: S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 a)) :+: C1 (MetaCons "VersionRangeParensF" PrefixI False) (S1 (MetaSel (Nothing :: Maybe Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 a))))))

cataVersionRange :: (VersionRangeF a -> a) -> VersionRange -> a Source #

Fold VersionRange.

Since: 2.2

anaVersionRange :: (a -> VersionRangeF a) -> a -> VersionRange Source #

Unfold VersionRange.

Since: 2.2

Utilities

majorUpperBound :: Version -> Version Source #

Compute next greater major version to be used as upper bound

Example: 0.4.1 produces the version 0.5 which then can be used to construct a range >= 0.4.1 && < 0.5

Since: 2.2

Modification

removeUpperBound :: VersionRange -> VersionRange Source #

Given a version range, remove the highest upper bound. Example: (>= 1 && < 3) || (>= 4 && < 5) is converted to (>= 1 && || (= 4).

removeLowerBound :: VersionRange -> VersionRange Source #

Given a version range, remove the lowest lower bound. Example: (>= 1 && || (= 4 && < 5) is converted to (>= 0 && || (= 4 && < 5).

Version intervals view

asVersionIntervals :: VersionRange -> [VersionInterval] Source #

View a VersionRange as a union of intervals.

This provides a canonical view of the semantics of a VersionRange as opposed to the syntax of the expression used to define it. For the syntactic view use foldVersionRange.

Each interval is non-empty. The sequence is in increasing order and no intervals overlap or touch. Therefore only the first and last can be unbounded. The sequence can be empty if the range is empty (e.g. a range expression like && 2).

Other checks are trivial to implement using this view. For example:

isNoVersion vr | [] <- asVersionIntervals vr = True
               | otherwise                   = False
isSpecificVersion vr
   | [(LowerBound v  InclusiveBound
      ,UpperBound v' InclusiveBound)] <- asVersionIntervals vr
   , v == v'   = Just v
   | otherwise = Nothing

data Bound Source #

Instances
Eq Bound Source # 
Instance details

Methods

(==) :: Bound -> Bound -> Bool #

(/=) :: Bound -> Bound -> Bool #

Show Bound Source # 
Instance details

Methods

showsPrec :: Int -> Bound -> ShowS #

show :: Bound -> String #

showList :: [Bound] -> ShowS #

VersionIntervals abstract type

The VersionIntervals type and the accompanying functions are exposed primarily for completeness and testing purposes. In practice asVersionIntervals is the main function to use to view a VersionRange as a bunch of VersionIntervals.

data VersionIntervals Source #

A complementary representation of a VersionRange. Instead of a boolean version predicate it uses an increasing sequence of non-overlapping, non-empty intervals.

The key point is that this representation gives a canonical representation for the semantics of VersionRanges. This makes it easier to check things like whether a version range is empty, covers all versions, or requires a certain minimum or maximum version. It also makes it easy to check equality or containment. It also makes it easier to identify 'simple' version predicates for translation into foreign packaging systems that do not support complex version range expressions.

toVersionIntervals :: VersionRange -> VersionIntervals Source #

Convert a VersionRange to a sequence of version intervals.

fromVersionIntervals :: VersionIntervals -> VersionRange Source #

Convert a VersionIntervals value back into a VersionRange expression representing the version intervals.

withinIntervals :: Version -> VersionIntervals -> Bool Source #

Test if a version falls within the version intervals.

It exists mostly for completeness and testing. It satisfies the following properties:

withinIntervals v (toVersionIntervals vr) = withinRange v vr
withinIntervals v ivs = withinRange v (fromVersionIntervals ivs)

versionIntervals :: VersionIntervals -> [VersionInterval] Source #

Inspect the list of version intervals.

mkVersionIntervals :: [VersionInterval] -> VersionIntervals Source #

Directly construct a VersionIntervals from a list of intervals.

In Cabal-2.2 the Maybe is dropped from the result type.