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|
{-# Language DuplicateRecordFields, OverloadedStrings #-}
{-|
Module : DecodeSpec
Description : Show that decoding TOML works using the various provided classes
Copyright : (c) Eric Mertens, 2023
License : ISC
Maintainer : emertens@gmail.com
-}
module DecodeSpec (spec) where
import Data.Maybe (fromMaybe)
import GHC.Generics (Generic)
import QuoteStr (quoteStr)
import Test.Hspec (it, shouldBe, Spec)
import Toml (decode, encode)
import Toml.Schema
newtype Fruits = Fruits { fruits :: [Fruit] }
deriving (Eq, Show, Generic)
data Fruit = Fruit {
name :: String,
physical :: Maybe Physical,
varieties :: [Variety]
} deriving (Eq, Show, Generic)
data Physical = Physical {
color :: String,
shape :: String
} deriving (Eq, Show, Generic)
newtype Variety = Variety {
name :: String
} deriving (Eq, Show, Generic)
instance FromValue Fruits where fromValue = genericFromTable
instance FromValue Physical where fromValue = genericFromTable
instance FromValue Variety where fromValue = genericFromTable
instance ToTable Fruits where toTable = genericToTable
instance ToTable Physical where toTable = genericToTable
instance ToTable Variety where toTable = genericToTable
instance ToValue Fruits where toValue = defaultTableToValue
instance ToValue Fruit where toValue = defaultTableToValue
instance ToValue Physical where toValue = defaultTableToValue
instance ToValue Variety where toValue = defaultTableToValue
instance FromValue Fruit where
fromValue = parseTableFromValue (Fruit
<$> reqKey "name"
<*> optKey "physical"
<*> (fromMaybe [] <$> optKey "varieties"))
instance ToTable Fruit where
toTable (Fruit n mbp vs) = table $
["varieties" .= vs | not (null vs)] ++
["physical" .= p | Just p <- [mbp]] ++
["name" .= n]
spec :: Spec
spec =
do let expect = Fruits [
Fruit "apple" (Just (Physical "red" "round")) [Variety "red delicious", Variety "granny smith"],
Fruit "banana" Nothing [Variety "plantain"]]
it "handles fruit example" $
decode [quoteStr|
[[fruits]]
name = "apple"
[fruits.physical] # subtable
color = "red"
shape = "round"
[[fruits.varieties]] # nested array of tables
name = "red delicious"
[[fruits.varieties]]
name = "granny smith"
[[fruits]]
name = "banana"
[[fruits.varieties]]
name = "plantain"|]
`shouldBe`
Success mempty expect
it "encodes correctly" $
show (encode expect)
`shouldBe`
[quoteStr|
[[fruits]]
name = "apple"
[fruits.physical]
color = "red"
shape = "round"
[[fruits.varieties]]
name = "red delicious"
[[fruits.varieties]]
name = "granny smith"
[[fruits]]
name = "banana"
[[fruits.varieties]]
name = "plantain"|]
it "generates warnings for unused keys" $
decode [quoteStr|
[[fruits]]
name = "peach"
taste = "sweet"
count = 5
[[fruits]]
name = "pineapple"
color = "yellow"|]
`shouldBe`
Success [
"4:1: unexpected key: count in fruits[0]",
"3:1: unexpected key: taste in fruits[0]",
"7:1: unexpected key: color in fruits[1]"]
(Fruits [Fruit "peach" Nothing [], Fruit "pineapple" Nothing []])
it "handles missing key errors" $
(decode "[[fruits]]" :: Result String Fruits)
`shouldBe`
Failure ["1:3: missing key: name in fruits[0]"]
it "handles parse errors while decoding" $
(decode "x =" :: Result String Fruits)
`shouldBe`
Failure ["1:4: parse error: unexpected end-of-input"]
|
