94 lines
3.1 KiB
Haskell
94 lines
3.1 KiB
Haskell
---------------------------------------------------------
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--
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-- Module : Data.Object.Instances
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-- Copyright : Michael Snoyman
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-- License : BSD3
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--
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-- Maintainer : Michael Snoyman <michael@snoyman.com>
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-- Stability : Stable
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-- Portability : portable
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--
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-- Instances for converting various types of data into Data.Object.Object.
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--
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---------------------------------------------------------
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module Data.Object.Instances
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( Json (..)
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, Yaml (..)
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, Html (..)
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) where
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import Data.Object
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import qualified Data.ByteString as B
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import Data.ByteString.Class
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import Web.Encodings (encodeJson)
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import qualified Text.Yaml as Y
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newtype Json = Json B.ByteString
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instance FromObject Json where
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fromObject = return . Json . helper where
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helper :: Object -> B.ByteString
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helper (Scalar s) = B.concat
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[ toStrictByteString "\""
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, encodeJson $ fromStrictByteString s
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, toStrictByteString "\""
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]
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helper (Sequence s) = B.concat
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[ toStrictByteString "["
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, B.intercalate (toStrictByteString ",") $ map helper s
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, toStrictByteString "]"
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]
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helper (Mapping m) = B.concat
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[ toStrictByteString "{"
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, B.intercalate (toStrictByteString ",") $ map helper2 m
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, toStrictByteString "}"
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]
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helper2 :: (B.ByteString, Object) -> B.ByteString
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helper2 (k, v) = B.concat
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[ toStrictByteString "\""
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, encodeJson $ fromStrictByteString k
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, toStrictByteString "\":"
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, helper v
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]
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newtype Yaml = Yaml B.ByteString
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instance FromObject Yaml where
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fromObject = return . Yaml . Y.encode
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-- | Represents as an entire HTML 5 document by using the following:
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--
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-- * A scalar is a paragraph.
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-- * A sequence is an unordered list.
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-- * A mapping is a definition list.
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newtype Html = Html B.ByteString
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instance FromObject Html where
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fromObject o = return $ Html $ B.concat
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[ toStrictByteString "<!DOCTYPE html>\n<html><body>"
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, helper o
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, toStrictByteString "</body></html>"
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] where
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helper :: Object -> B.ByteString
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helper (Scalar s) = B.concat
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[ toStrictByteString "<p>"
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, s
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, toStrictByteString "</p>"
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]
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helper (Sequence []) = toStrictByteString "<ul></ul>"
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helper (Sequence s) = B.concat
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[ toStrictByteString "<ul><li>"
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, B.intercalate (toStrictByteString "</li><li>") $ map helper s
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, toStrictByteString "</li></ul>"
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]
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helper (Mapping m) = B.concat $
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toStrictByteString "<dl>" :
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map helper2 m ++
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[ toStrictByteString "</dl>" ]
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helper2 :: (B.ByteString, Object) -> B.ByteString
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helper2 (k, v) = B.concat $
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[ toStrictByteString "<dt>"
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, k
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, toStrictByteString "</dt><dd>"
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, helper v
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, toStrictByteString "</dd>"
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]
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