Cabal-2.4.0.0: A framework for packaging Haskell software

Safe HaskellNone
LanguageHaskell2010

Distribution.Backpack

Contents

Description

This module defines the core data types for Backpack. For more details, see:

https://github.com/ezyang/ghc-proposals/blob/backpack/proposals/0000-backpack.rst

Synopsis

OpenUnitId

data OpenUnitId #

An OpenUnitId describes a (possibly partially) instantiated Backpack component, with a description of how the holes are filled in. Unlike OpenUnitId, the ModuleSubst is kept in a structured form that allows for substitution (which fills in holes.) This form of unit cannot be installed. It must first be converted to a UnitId.

In the absence of Backpack, there are no holes to fill, so any such component always has an empty module substitution; thus we can lossly represent it as an 'OpenUnitId uid'.

For a source component using Backpack, however, there is more structure as components may be parametrized over some signatures, and these "holes" may be partially or wholly filled.

OpenUnitId plays an important role when we are mix-in linking, and is recorded to the installed packaged database for indefinite packages; however, for compiled packages that are fully instantiated, we instantiate OpenUnitId into UnitId.

For more details see the Backpack spec https://github.com/ezyang/ghc-proposals/blob/backpack/proposals/0000-backpack.rst

Constructors

IndefFullUnitId ComponentId OpenModuleSubst

Identifies a component which may have some unfilled holes; specifying its ComponentId and its OpenModuleSubst. TODO: Invariant that OpenModuleSubst is non-empty? See also the Text instance.

DefiniteUnitId DefUnitId

Identifies a fully instantiated component, which has been compiled and abbreviated as a hash. The embedded UnitId MUST NOT be for an indefinite component; an OpenUnitId is guaranteed not to have any holes.

Instances
Eq OpenUnitId # 
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Defined in Distribution.Backpack

Data OpenUnitId # 
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Methods

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

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

toConstr :: OpenUnitId -> Constr #

dataTypeOf :: OpenUnitId -> DataType #

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

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

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

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

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

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

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

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

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

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

Ord OpenUnitId # 
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Read OpenUnitId # 
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Show OpenUnitId # 
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Generic OpenUnitId # 
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Associated Types

type Rep OpenUnitId :: * -> * #

Binary OpenUnitId # 
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NFData OpenUnitId # 
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rnf :: OpenUnitId -> () #

Pretty OpenUnitId # 
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pretty :: OpenUnitId -> Doc #

Parsec OpenUnitId #
>>> eitherParsec "foobar" :: Either String OpenUnitId
Right (DefiniteUnitId (DefUnitId {unDefUnitId = UnitId "foobar"}))
>>> eitherParsec "foo[Str=text-1.2.3:Data.Text.Text]" :: Either String OpenUnitId
Right (IndefFullUnitId (ComponentId "foo") (fromList [(ModuleName ["Str"],OpenModule (DefiniteUnitId (DefUnitId {unDefUnitId = UnitId "text-1.2.3"})) (ModuleName ["Data","Text","Text"]))]))
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parsec :: CabalParsing m => m OpenUnitId #

Text OpenUnitId # 
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ModSubst OpenUnitId # 
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Defined in Distribution.Backpack.ModSubst

type Rep OpenUnitId # 
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openUnitIdFreeHoles :: OpenUnitId -> Set ModuleName #

Get the set of holes (ModuleVar) embedded in a UnitId.

mkOpenUnitId :: UnitId -> ComponentId -> OpenModuleSubst -> OpenUnitId #

Safe constructor from a UnitId. The only way to do this safely is if the instantiation is provided.

DefUnitId

data DefUnitId #

A UnitId for a definite package. The DefUnitId invariant says that a UnitId identified this way is definite; i.e., it has no unfilled holes.

Instances
Eq DefUnitId # 
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Defined in Distribution.Types.UnitId

Data DefUnitId # 
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Defined in Distribution.Types.UnitId

Methods

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

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

toConstr :: DefUnitId -> Constr #

dataTypeOf :: DefUnitId -> DataType #

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

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

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

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

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

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

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

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

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

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

Ord DefUnitId # 
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Defined in Distribution.Types.UnitId

Read DefUnitId # 
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Defined in Distribution.Types.UnitId

Show DefUnitId # 
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Defined in Distribution.Types.UnitId

Generic DefUnitId # 
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Defined in Distribution.Types.UnitId

Associated Types

type Rep DefUnitId :: * -> * #

Binary DefUnitId # 
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Defined in Distribution.Types.UnitId

NFData DefUnitId # 
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Defined in Distribution.Types.UnitId

Methods

rnf :: DefUnitId -> () #

Pretty DefUnitId # 
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Defined in Distribution.Types.UnitId

Methods

pretty :: DefUnitId -> Doc #

Parsec DefUnitId # 
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Defined in Distribution.Types.UnitId

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parsec :: CabalParsing m => m DefUnitId #

Text DefUnitId # 
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Defined in Distribution.Types.UnitId

type Rep DefUnitId # 
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Defined in Distribution.Types.UnitId

type Rep DefUnitId = D1 (MetaData "DefUnitId" "Distribution.Types.UnitId" "Cabal-2.4.0.0-8En9aDn0HOVDVTKXJjqCyH" True) (C1 (MetaCons "DefUnitId" PrefixI True) (S1 (MetaSel (Just "unDefUnitId") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 UnitId)))

mkDefUnitId :: ComponentId -> Map ModuleName Module -> DefUnitId #

Create a DefUnitId from a ComponentId and an instantiation with no holes.

OpenModule

data OpenModule #

Unlike a Module, an OpenModule is either an ordinary module from some unit, OR an OpenModuleVar, representing a hole that needs to be filled in. Substitutions are over module variables.

Instances
Eq OpenModule # 
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Defined in Distribution.Backpack

Data OpenModule # 
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Methods

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

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

toConstr :: OpenModule -> Constr #

dataTypeOf :: OpenModule -> DataType #

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

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

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

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

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

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

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

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

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

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

Ord OpenModule # 
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Read OpenModule # 
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Show OpenModule # 
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Generic OpenModule # 
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type Rep OpenModule :: * -> * #

Binary OpenModule # 
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NFData OpenModule # 
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rnf :: OpenModule -> () #

Pretty OpenModule # 
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pretty :: OpenModule -> Doc #

Parsec OpenModule #
>>> eitherParsec "Includes2-0.1.0.0-inplace-mysql:Database.MySQL" :: Either String OpenModule
Right (OpenModule (DefiniteUnitId (DefUnitId {unDefUnitId = UnitId "Includes2-0.1.0.0-inplace-mysql"})) (ModuleName ["Database","MySQL"]))
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parsec :: CabalParsing m => m OpenModule #

Text OpenModule # 
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ModSubst OpenModule # 
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Defined in Distribution.Backpack.ModSubst

type Rep OpenModule # 
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Defined in Distribution.Backpack

openModuleFreeHoles :: OpenModule -> Set ModuleName #

Get the set of holes (ModuleVar) embedded in a Module.

OpenModuleSubst

type OpenModuleSubst = Map ModuleName OpenModule #

An explicit substitution on modules.

NB: These substitutions are NOT idempotent, for example, a valid substitution is (A -> B, B -> A).

dispOpenModuleSubst :: OpenModuleSubst -> Doc #

Pretty-print the entries of a module substitution, suitable for embedding into a OpenUnitId or passing to GHC via --instantiate-with.

dispOpenModuleSubstEntry :: (ModuleName, OpenModule) -> Doc #

Pretty-print a single entry of a module substitution.

parseOpenModuleSubst :: ReadP r OpenModuleSubst #

Inverse to dispModSubst.

parseOpenModuleSubstEntry :: ReadP r (ModuleName, OpenModule) #

Inverse to dispModSubstEntry.

parsecOpenModuleSubst :: CabalParsing m => m OpenModuleSubst #

Inverse to dispModSubst.

Since: 2.2

parsecOpenModuleSubstEntry :: CabalParsing m => m (ModuleName, OpenModule) #

Inverse to dispModSubstEntry.

Since: 2.2

openModuleSubstFreeHoles :: OpenModuleSubst -> Set ModuleName #

Get the set of holes (ModuleVar) embedded in a OpenModuleSubst. This is NOT the domain of the substitution.

Conversions to UnitId

abstractUnitId :: OpenUnitId -> UnitId #

When typechecking, we don't demand that a freshly instantiated IndefFullUnitId be compiled; instead, we just depend on the installed indefinite unit installed at the ComponentId.

hashModuleSubst :: Map ModuleName Module -> Maybe String #

Take a module substitution and hash it into a string suitable for UnitId. Note that since this takes Module, not OpenModule, you are responsible for recursively converting OpenModule into Module. See also Distribution.Backpack.ReadyComponent.