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31 lines
960 B
Haskell
31 lines
960 B
Haskell
{-# LANGUAGE OverloadedStrings #-}
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module Example where
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import Control.Monad (unless)
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import Data.Aeson
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import qualified Data.Aeson.Pointer as P
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main :: IO ()
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main = do
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-- JSON Pointers must either be empty or start with a /.
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pntr1 <- case P.unescape "/foo/0" of
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Left _ -> error "Failed to construct JSON Pointer."
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Right pntr -> return pntr
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-- We can also write JSON Pointers in Haskell.
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let pntr2 = P.Pointer [P.Token "/"]
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-- When we do this we don't have to escape / or ~ characters
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-- (as ~1 and ~0 respectively) like we do in an escaped JSON
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-- Pointer string.
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unless (P.unescape "/~1" == Right pntr2) (error "ohno!")
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print (P.resolve pntr1 document)
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print (P.resolve pntr2 document)
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where
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document :: Value
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document = object [ "foo" .= [String "bar", String "baz"]
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, "/" .= String "quux"
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]
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