我正在尝试从API解析具有如下数据结构的JSON
{
"en": {
"translation": {
"name": "Name",
"description": ["I am a", "en person"]
}
},
"jp": {
"translation": {
"name": "JP Name",
"description": ["I am a", "jp person"]
}
}
}
所以我只想将它们解析为newtype Translations = Map String String
。语言环境将是键名称,而值将只是JSON转换的字符串,例如,{"name": "Name", "description": ["I am a", en person"]}
因为该值可能是任意复杂的,所以我很想/需要将其转换为其他Haskell数据结构。
我尝试了很多方法来编写适合的书parseJSON
,Translation
但仍然做不到。
任何帮助,将不胜感激!
我们可以用解码ByteString
:
Prelude Data.Aeson Bs Hm Mp Tx> decode text :: Maybe Object
Just (fromList [("jp",Object (fromList [("translation",Object (fromList [("name",String "JP Name"),("description",Array [String "I am a",String "jp person"])]))])),("en",Object (fromList [("translation",Object (fromList [("name",String "Name"),("description",Array [String "I am a",String "en person"])]))]))])
因此,我们只需要HashMap Text Object
在对象构造函数中包装的对象上执行映射:
import Data.Aeson
import qualified Data.ByteString.Lazy.Char8 as Bs
import qualified Data.HashMap.Lazy as Hm
import qualified Data.Map as Mp
import qualified Data.Text as Tx
process :: Value -> Maybe (Mp.Map String String)
process (Object m) = Just ((Mp.fromList . map f) (Hm.toList m))
where f (x, y) = (Tx.unpack x, Bs.unpack (encode y))
process _ = Nothing
然后,我们获得一个Map String String
包装在中的s Maybe
(由于两种解码方式都可能导致处理出错,因此最好使用Maybe
),将映射String
到上String
:
Prelude Data.Aeson Bs Hm Mp Tx> decode text >>= process
Just (fromList [("en","{\"translation\":{\"name\":\"Name\",\"description\":[\"I am a\",\"en person\"]}}"),("jp","{\"translation\":{\"name\":\"JP Name\",\"description\":[\"I am a\",\"jp person\"]}}")])
话虽这么说,我不确定JSON Blob是否是您想要的值,因为现在无法“查看”该值并检查该元素内部的内容。此外,如果您要进行大量查找,Text
则当您要检查两个Text
s是否相同时,通常快一个数量级。
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我来说两句