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module Options.Applicative.
Arrows This module contains an arrow interface for option parsers, which allows to define and combine parsers using the arrow notation and arrow combinators. The arrow syntax is particularly useful to create parsers of nested structures, or records where the order of fields is different from the order in which the parsers should be applied. For example, an arguments parser often needs to be applied last, and that makes it inconvenient to use it for a field which is not the last one in a record. Using the arrow syntax and the functions in this module, one can write, e.g.:
data Options = Options { optArgs :: [String] , optVerbose :: Bool } opts :: Parser Options opts = runA $ proc () -> do verbose <- asA (switch (short 'v')) -< () args <- asA (arguments str idm) -< () returnA -< Options args verboseParser arrows, created out of regular Parser values using the asA function, are arrows taking () as argument and returning the parsed value.-
No documentation available.
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ghc GHC.Parser.Lexer No documentation available.
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ghc GHC.Tc.Types No documentation available.
ArrowCtxt :: LocalRdrEnv -> TcRef WantedConstraints -> ArrowCtxtghc GHC.Tc.Types No documentation available.
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ghc GHC.Tc.Types.LclEnv No documentation available.
ArrowCtxt :: LocalRdrEnv -> TcRef WantedConstraints -> ArrowCtxtghc GHC.Tc.Types.LclEnv No documentation available.
ArrowCmdApp :: !HsCmd GhcRn -> !HsExpr GhcRn -> FRRArrowContextghc GHC.Tc.Types.Origin The argument to an arrow in an arrow command application does not have a fixed runtime representation. Test cases: none.
ArrowCmdArrApp :: !HsExpr GhcRn -> !HsExpr GhcRn -> HsArrAppType -> FRRArrowContextghc GHC.Tc.Types.Origin A function in an arrow application does not have a fixed runtime representation. Test cases: none.
ArrowCmdCase :: FRRArrowContextghc GHC.Tc.Types.Origin The scrutinee type in an arrow command case statement does not have a fixed runtime representation. Test cases: none.