Cabal-1.23.1.0: A framework for packaging Haskell software

CopyrightIsaac Jones, Simon Marlow 2003-2004 Duncan Coutts 2008
LicenseBSD3
Maintainercabal-devel@haskell.org
Portabilityportable
Safe HaskellSafe
LanguageHaskell98

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 :: TYPE Lifted Source

A Version represents the version of a software entity.

An instance of Eq is provided, which implements exact equality modulo reordering of the tags in the versionTags field.

An instance of Ord is also provided, which gives lexicographic ordering on the versionBranch fields (i.e. 2.1 > 2.0, 1.2.3 > 1.2.2, etc.). This is expected to be sufficient for many uses, but note that you may need to use a more specific ordering for your versioning scheme. For example, some versioning schemes may include pre-releases which have tags "pre1", "pre2", and so on, and these would need to be taken into account when determining ordering. In some cases, date ordering may be more appropriate, so the application would have to look for date tags in the versionTags field and compare those. The bottom line is, don't always assume that compare and other Ord operations are the right thing for every Version.

Similarly, concrete representations of versions may differ. One possible concrete representation is provided (see showVersion and parseVersion), but depending on the application a different concrete representation may be more appropriate.

Constructors

Version 

Fields

  • versionBranch :: [Int]

    The numeric branch for this version. This reflects the fact that most software versions are tree-structured; there is a main trunk which is tagged with versions at various points (1,2,3...), and the first branch off the trunk after version 3 is 3.1, the second branch off the trunk after version 3 is 3.2, and so on. The tree can be branched arbitrarily, just by adding more digits.

    We represent the branch as a list of Int, so version 3.2.1 becomes [3,2,1]. Lexicographic ordering (i.e. the default instance of Ord for [Int]) gives the natural ordering of branches.

  • versionTags :: [String]

    A version can be tagged with an arbitrary list of strings. The interpretation of the list of tags is entirely dependent on the entity that this version applies to.

Instances

IsList Version

Since: 4.8.0.0

Eq Version 

Methods

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

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

Data Version 

Methods

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

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

toConstr :: Version -> Constr Source

dataTypeOf :: Version -> DataType Source

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

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

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

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

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

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

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

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

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

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

Ord Version 
Read Version 
Show Version 
Generic Version 

Associated Types

type Rep Version :: * -> * Source

Binary Version

Since: 0.8.0.0

NFData Version

Since: 1.3.0.0

Methods

rnf :: Version -> () Source

Text Version 
type Rep Version = D1 (MetaData "Version" "Data.Version" "base" False) (C1 (MetaCons "Version" PrefixI True) ((:*:) (S1 (MetaSel (Just Symbol "versionBranch") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 [Int])) (S1 (MetaSel (Just Symbol "versionTags") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 [String])))) 
type Item Version = Int 

Version ranges

data VersionRange Source

Instances

Eq VersionRange 
Data VersionRange 

Methods

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

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

toConstr :: VersionRange -> Constr Source

dataTypeOf :: VersionRange -> DataType Source

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

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

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

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

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

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

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

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

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

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

Read VersionRange 
Show VersionRange 
Generic VersionRange 
Binary VersionRange 
Text VersionRange 
type Rep VersionRange = D1 (MetaData "VersionRange" "Distribution.Version" "Cabal-1.23.1.0" False) ((:+:) ((:+:) ((:+:) (C1 (MetaCons "AnyVersion" PrefixI False) U1) (C1 (MetaCons "ThisVersion" PrefixI False) (S1 (MetaSel (Nothing Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 Version)))) ((:+:) (C1 (MetaCons "LaterVersion" PrefixI False) (S1 (MetaSel (Nothing Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 Version))) (C1 (MetaCons "EarlierVersion" PrefixI False) (S1 (MetaSel (Nothing Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 Version))))) ((:+:) ((:+:) (C1 (MetaCons "WildcardVersion" PrefixI False) (S1 (MetaSel (Nothing Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 Version))) (C1 (MetaCons "UnionVersionRanges" PrefixI False) ((:*:) (S1 (MetaSel (Nothing Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 VersionRange)) (S1 (MetaSel (Nothing Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 VersionRange))))) ((:+:) (C1 (MetaCons "IntersectVersionRanges" PrefixI False) ((:*:) (S1 (MetaSel (Nothing Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 VersionRange)) (S1 (MetaSel (Nothing Symbol) NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 VersionRange)))) (C1 (MetaCons "VersionRangeParens" PrefixI False) (S1 (MetaSel (Nothing 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

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

betweenVersionsInclusive :: Version -> Version -> VersionRange Source

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

The version range >= v1 && <= v2.

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

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

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.

-> (a -> a -> a)

"_ || _" union

-> (a -> a -> a)

"_ && _" intersection

-> (a -> a)

"(_)" parentheses

-> VersionRange 
-> a 

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.

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

Modification

removeUpperBound :: VersionRange -> VersionRange Source

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

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

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] -> Maybe VersionIntervals Source

Directly construct a VersionIntervals from a list of intervals.

Each interval must be non-empty. The sequence must be in increasing order and no intervals may overlap or touch. If any of these conditions are not satisfied the function returns Nothing.