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ghc-lens
lens.cabal
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File lens.cabal of Package ghc-lens
name: lens category: Data, Lenses, Generics version: 5.1 x-revision: 1 license: BSD2 cabal-version: 1.18 license-file: LICENSE author: Edward A. Kmett maintainer: Edward A. Kmett <ekmett@gmail.com> stability: provisional homepage: http://github.com/ekmett/lens/ bug-reports: http://github.com/ekmett/lens/issues copyright: Copyright (C) 2012-2016 Edward A. Kmett build-type: Simple -- build-tools: cpphs tested-with: GHC == 8.0.2 , GHC == 8.2.2 , GHC == 8.4.4 , GHC == 8.6.5 , GHC == 8.8.4 , GHC == 8.10.7 , GHC == 9.0.1 , GHC == 9.2.1 synopsis: Lenses, Folds and Traversals description: This package comes \"Batteries Included\" with many useful lenses for the types commonly used from the Haskell Platform, and with tools for automatically generating lenses and isomorphisms for user-supplied data types. . The combinators in @Control.Lens@ provide a highly generic toolbox for composing families of getters, folds, isomorphisms, traversals, setters and lenses and their indexed variants. . An overview, with a large number of examples can be found in the <https://github.com/ekmett/lens#lens-lenses-folds-and-traversals README>. . An introductory video on the style of code used in this library by Simon Peyton Jones is available from <http://skillsmatter.com/podcast/scala/lenses-compositional-data-access-and-manipulation Skills Matter>. . A video on how to use lenses and how they are constructed is available on <http://youtu.be/cefnmjtAolY?hd=1 youtube>. . Slides for that second talk can be obtained from <http://comonad.com/haskell/Lenses-Folds-and-Traversals-NYC.pdf comonad.com>. . More information on the care and feeding of lenses, including a brief tutorial and motivation for their types can be found on the <https://github.com/ekmett/lens/wiki lens wiki>. . A small game of @pong@ and other more complex examples that manage their state using lenses can be found in the <https://github.com/ekmett/lens/blob/master/examples/ example folder>. . /Lenses, Folds and Traversals/ . With some signatures simplified, the core of the hierarchy of lens-like constructions looks like: . . <<http://i.imgur.com/ALlbPRa.png>> . <images/Hierarchy.png (Local Copy)> . You can compose any two elements of the hierarchy above using @(.)@ from the @Prelude@, and you can use any element of the hierarchy as any type it linked to above it. . The result is their lowest upper bound in the hierarchy (or an error if that bound doesn't exist). . For instance: . * You can use any 'Traversal' as a 'Fold' or as a 'Setter'. . * The composition of a 'Traversal' and a 'Getter' yields a 'Fold'. . /Minimizing Dependencies/ . If you want to provide lenses and traversals for your own types in your own libraries, then you can do so without incurring a dependency on this (or any other) lens package at all. . /e.g./ for a data type: . > data Foo a = Foo Int Int a . You can define lenses such as . > -- bar :: Lens' (Foo a) Int > bar :: Functor f => (Int -> f Int) -> Foo a -> f (Foo a) > bar f (Foo a b c) = fmap (\a' -> Foo a' b c) (f a) . > -- quux :: Lens (Foo a) (Foo b) a b > quux :: Functor f => (a -> f b) -> Foo a -> f (Foo b) > quux f (Foo a b c) = fmap (Foo a b) (f c) . without the need to use any type that isn't already defined in the @Prelude@. . And you can define a traversal of multiple fields with 'Control.Applicative.Applicative': . > -- traverseBarAndBaz :: Traversal' (Foo a) Int > traverseBarAndBaz :: Applicative f => (Int -> f Int) -> Foo a -> f (Foo a) > traverseBarAndBaz f (Foo a b c) = Foo <$> f a <*> f b <*> pure c . What is provided in this library is a number of stock lenses and traversals for common haskell types, a wide array of combinators for working them, and more exotic functionality, (/e.g./ getters, setters, indexed folds, isomorphisms). extra-source-files: .gitignore .hlint.yaml .vim.custom cabal.project examples/LICENSE examples/lens-examples.cabal examples/*.hs examples/*.lhs examples/.hlint.yaml include/*.h lens-properties/.hlint.yaml lens-properties/CHANGELOG.markdown lens-properties/LICENSE lens-properties/Setup.hs lens-properties/lens-properties.cabal AUTHORS.markdown CHANGELOG.markdown README.markdown SUPPORT.markdown extra-doc-files: images/*.png source-repository head type: git location: https://github.com/ekmett/lens.git -- Enable benchmarking against Neil Mitchell's uniplate library for comparative performance analysis. Defaults to being turned off to avoid -- the extra dependency. -- -- > cabal configure --enable-benchmarks -fbenchmark-uniplate && cabal build && cabal bench flag benchmark-uniplate default: False manual: True -- Generate inline pragmas when using template-haskell. This defaults to enabled, but you can -- -- > cabal install lens -f-inlining -- -- to shut it off to benchmark the relative performance impact, or as last ditch effort to address compile -- errors resulting from the myriad versions of template-haskell that all purport to be 2.8. flag inlining manual: True default: True -- Make the test suites dump their template-haskell splices. flag dump-splices default: False manual: True -- You can disable the hunit test suite with -f-test-hunit flag test-hunit default: True manual: True -- Build the properties test if we're building tests flag test-properties default: True manual: True flag test-templates default: True manual: True -- Assert that we are trustworthy when we can flag trustworthy default: True manual: True -- Attempt a parallel build with GHC 7.8 flag j default: False manual: True library build-depends: array >= 0.5.0.0 && < 0.6, assoc >= 1.0.2 && < 1.1, base >= 4.9 && < 5, base-orphans >= 0.5.2 && < 1, bifunctors >= 5.5.7 && < 6, bytestring >= 0.10.4.0 && < 0.12, call-stack >= 0.1 && < 0.5, comonad >= 5.0.7 && < 6, containers >= 0.5.5.1 && < 0.7, contravariant >= 1.4 && < 2, distributive >= 0.5.1 && < 1, exceptions >= 0.8.2.1 && < 1, filepath >= 1.2.0.0 && < 1.5, free >= 5.1.5 && < 6, ghc-prim, hashable >= 1.2.7.0 && < 1.5, indexed-traversable >= 0.1 && < 0.2, indexed-traversable-instances >= 0.1 && < 0.2, kan-extensions >= 5 && < 6, mtl >= 2.2.1 && < 2.3, parallel >= 3.2.1.0 && < 3.3, profunctors >= 5.5.2 && < 6, reflection >= 2.1 && < 3, semigroupoids >= 5.0.1 && < 6, strict >= 0.4 && < 0.5, tagged >= 0.8.6 && < 1, template-haskell >= 2.11.1.0 && < 2.19, text >= 1.2.3.0 && < 2.1, th-abstraction >= 0.4.1 && < 0.5, these >= 1.1.1.1 && < 1.2, transformers >= 0.5.0.0 && < 0.6, transformers-compat >= 0.5.0.4 && < 1, unordered-containers >= 0.2.10 && < 0.3, vector >= 0.12.1.2 && < 0.13 -- Control.Lens as the first module, so cabal repl loads it. exposed-modules: Control.Lens exposed-modules: Control.Exception.Lens Control.Lens.At Control.Lens.Combinators Control.Lens.Cons Control.Lens.Each Control.Lens.Empty Control.Lens.Equality Control.Lens.Extras Control.Lens.Fold Control.Lens.Getter Control.Lens.Indexed Control.Lens.Internal Control.Lens.Internal.Bazaar Control.Lens.Internal.ByteString Control.Lens.Internal.Context Control.Lens.Internal.CTypes Control.Lens.Internal.Deque Control.Lens.Internal.Exception Control.Lens.Internal.FieldTH Control.Lens.Internal.PrismTH Control.Lens.Internal.Fold Control.Lens.Internal.Getter Control.Lens.Internal.Indexed Control.Lens.Internal.Instances Control.Lens.Internal.Iso Control.Lens.Internal.Level Control.Lens.Internal.List Control.Lens.Internal.Magma Control.Lens.Internal.Prism Control.Lens.Internal.Profunctor Control.Lens.Internal.Review Control.Lens.Internal.Setter Control.Lens.Internal.TH Control.Lens.Internal.Zoom Control.Lens.Iso Control.Lens.Lens Control.Lens.Level Control.Lens.Operators Control.Lens.Plated Control.Lens.Prism Control.Lens.Profunctor Control.Lens.Reified Control.Lens.Review Control.Lens.Setter Control.Lens.TH Control.Lens.Traversal Control.Lens.Tuple Control.Lens.Type Control.Lens.Unsound Control.Lens.Wrapped Control.Lens.Zoom Control.Monad.Error.Lens Control.Parallel.Strategies.Lens Control.Seq.Lens Data.Array.Lens Data.Bits.Lens Data.ByteString.Lens Data.ByteString.Strict.Lens Data.ByteString.Lazy.Lens Data.Complex.Lens Data.Data.Lens Data.Dynamic.Lens Data.HashSet.Lens Data.IntSet.Lens Data.List.Lens Data.Map.Lens Data.Sequence.Lens Data.Set.Lens Data.Text.Lens Data.Text.Strict.Lens Data.Text.Lazy.Lens Data.Tree.Lens Data.Typeable.Lens Data.Vector.Lens Data.Vector.Generic.Lens GHC.Generics.Lens System.Exit.Lens System.FilePath.Lens System.IO.Error.Lens Language.Haskell.TH.Lens Numeric.Lens Numeric.Natural.Lens other-modules: Control.Lens.Internal.Prelude if flag(trustworthy) && impl(ghc) other-extensions: Trustworthy cpp-options: -DTRUSTWORTHY=1 if flag(inlining) cpp-options: -DINLINING if flag(j) ghc-options: -j4 ghc-options: -Wall -Wtabs -O2 -fdicts-cheap -funbox-strict-fields -fmax-simplifier-iterations=10 -Wno-trustworthy-safe -Wmissing-pattern-synonym-signatures -Wno-redundant-constraints hs-source-dirs: src include-dirs: include default-language: Haskell2010 -- future proof, whether the field will be comma separated or not. x-docspec-extra-packages: simple-reflect x-docspec-extra-packages: deepseq -- Verify that Template Haskell expansion works test-suite templates type: exitcode-stdio-1.0 main-is: templates.hs other-modules: T799 T917 T972 ghc-options: -Wall -threaded hs-source-dirs: tests default-language: Haskell2010 if flag(dump-splices) ghc-options: -ddump-splices if !flag(test-templates) buildable: False else build-depends: base, lens -- Verify the properties of lenses with QuickCheck test-suite properties type: exitcode-stdio-1.0 main-is: properties.hs other-modules: Control.Lens.Properties ghc-options: -Wall -threaded -rtsopts -with-rtsopts=-N hs-source-dirs: tests lens-properties/src include-dirs: include default-language: Haskell2010 if !flag(test-properties) buildable: False else build-depends: base, lens, QuickCheck >= 2.4, test-framework >= 0.6, test-framework-quickcheck2 >= 0.2, transformers test-suite hunit type: exitcode-stdio-1.0 main-is: hunit.hs ghc-options: -Wall -threaded -rtsopts -with-rtsopts=-N hs-source-dirs: tests default-language: Haskell2010 if !flag(test-hunit) buildable: False else build-depends: base, containers, HUnit >= 1.2, lens, mtl, test-framework >= 0.6, test-framework-hunit >= 0.2 -- We need this dummy test-suite to add simple-reflect to the install plan -- -- When cabal-install's extra-packages support becomes widely available -- (i.e. after 3.4 release), we can remove this test-suite. test-suite doctests type: exitcode-stdio-1.0 main-is: doctests.hs hs-source-dirs: tests default-language: Haskell2010 build-depends: base, deepseq, simple-reflect >= 0.3.1 -- Basic benchmarks for the uniplate-style combinators benchmark plated type: exitcode-stdio-1.0 main-is: plated.hs ghc-options: -Wall -O2 -threaded -fdicts-cheap -funbox-strict-fields hs-source-dirs: benchmarks default-language: Haskell2010 build-depends: base, base-compat >=0.11.0 && <0.13, comonad, criterion, deepseq, generic-deriving, lens, transformers if flag(benchmark-uniplate) build-depends: uniplate >= 1.6.7 && < 1.7 cpp-options: -DBENCHMARK_UNIPLATE -- Benchmarking alongside variants benchmark alongside type: exitcode-stdio-1.0 main-is: alongside.hs ghc-options: -Wall -O2 -threaded -fdicts-cheap -funbox-strict-fields hs-source-dirs: benchmarks default-language: Haskell2010 build-depends: base, comonad >= 4, criterion, deepseq, lens, transformers -- Benchmarking folds benchmark folds type: exitcode-stdio-1.0 main-is: folds.hs ghc-options: -Wall -O2 -threaded -fdicts-cheap -funbox-strict-fields hs-source-dirs: benchmarks default-language: Haskell2010 build-depends: base, criterion, containers, bytestring, unordered-containers, vector, lens -- Benchmarking traversals benchmark traversals type: exitcode-stdio-1.0 main-is: traversals.hs ghc-options: -Wall -O2 -threaded -fdicts-cheap -funbox-strict-fields hs-source-dirs: benchmarks default-language: Haskell2010 build-depends: base, criterion, containers, deepseq, bytestring, unordered-containers, vector, lens -- Benchmarking unsafe implementation strategies benchmark unsafe type: exitcode-stdio-1.0 main-is: unsafe.hs ghc-options: -Wall -O2 -threaded -fdicts-cheap -funbox-strict-fields hs-source-dirs: benchmarks default-language: Haskell2010 build-depends: base, comonad >= 4, criterion >= 1, deepseq, generic-deriving, lens, transformers
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