83813b1df4
git-subtree-dir: yesod-json git-subtree-mainline:6f5459f70fgit-subtree-split:41a198225f
62 lines
1.8 KiB
Haskell
62 lines
1.8 KiB
Haskell
{-# LANGUAGE TypeSynonymInstances #-}
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{-# OPTIONS_GHC -fno-warn-orphans #-}
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module Yesod.Json
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( -- * Convert from a JSON value
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defaultLayoutJson
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, jsonToRepJson
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-- * Compatibility wrapper for old API
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, Json
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, jsonScalar
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, jsonList
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, jsonMap
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) where
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import Yesod.Handler (GHandler)
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import Yesod.Content
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( ToContent (toContent), RepHtmlJson (RepHtmlJson), RepHtml (RepHtml)
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, RepJson (RepJson), Content (ContentBuilder)
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)
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import Yesod.Core (defaultLayout, Yesod)
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import Yesod.Widget (GWidget)
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import qualified Data.Aeson as J
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import qualified Data.Aeson.Encode as JE
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import Data.Aeson.Encode (fromValue)
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import Data.Text (pack)
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import Control.Arrow (first)
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import Data.Map (fromList)
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import qualified Data.Vector as V
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import Text.Julius (ToJavascript (..))
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import Data.Text.Lazy.Builder (fromLazyText)
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import Data.Text.Lazy.Encoding (decodeUtf8)
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instance ToContent J.Value where
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toContent = flip ContentBuilder Nothing . fromValue
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-- | Provide both an HTML and JSON representation for a piece of data, using
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-- the default layout for the HTML output ('defaultLayout').
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defaultLayoutJson :: Yesod master
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=> GWidget sub master ()
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-> J.Value
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-> GHandler sub master RepHtmlJson
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defaultLayoutJson w json = do
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RepHtml html' <- defaultLayout w
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return $ RepHtmlJson html' $ toContent json
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-- | Wraps the 'Content' generated by 'jsonToContent' in a 'RepJson'.
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jsonToRepJson :: J.Value -> GHandler sub master RepJson
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jsonToRepJson = return . RepJson . toContent
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type Json = J.Value
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jsonScalar :: String -> Json
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jsonScalar = J.String . pack
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jsonList :: [Json] -> Json
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jsonList = J.Array . V.fromList
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jsonMap :: [(String, Json)] -> Json
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jsonMap = J.Object . fromList . map (first pack)
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instance ToJavascript J.Value where
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toJavascript = fromLazyText . decodeUtf8 . JE.encode
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