This package expose the function aesonQQ
that compile time converts json code into a Data.Aeson.Value
.
aesonQQ
got the signature
aesonQQ :: QuasiQuoter
and is used like
myCode = [aesonQQ| {age: 23, name: "Pelle", likes: ["mac","Haskell"] } |]
where it is important that
- you got no space in
[aesonQQ|
and - no additional code after
|]
.
The quasiquatation can also bind to variables like
myCode = [aesonQQ| {age: <|age|>, name: <|name|>} |] where age = 34 :: Integer name = "Pelle"
where the function toJSON
will be called on age
and name
runtime.
You can also insert Haskell code:
myCode = [aesonQQ| {age: <|age + 34 :: Integer|>, name: <|map toUpper name|>} |] where age = 34 :: Integer name = "Pelle"
You can use a similar syntax if you want to insert a value of type Data.Aeson.Value like
myCode = [aesonQQ| {"age": <<age>>} |]
If you want to replace the name of the key in a hash you'll use the $-syntax:
foo = [aesonQQ| {$bar: 42} |] bar = "age"