89 lines
3.0 KiB
Haskell
89 lines
3.0 KiB
Haskell
module Test.Pipes.CSV where
|
|
|
|
import Prelude
|
|
|
|
import Control.Monad.Gen (chooseInt)
|
|
import Control.Monad.Rec.Class (Step(..), tailRecM)
|
|
import Data.Array as Array
|
|
import Data.DateTime (DateTime)
|
|
import Data.Foldable (fold)
|
|
import Data.Maybe (Maybe(..), fromJust)
|
|
import Data.Newtype (wrap)
|
|
import Data.PreciseDateTime (fromRFC3339String, toDateTimeLossy)
|
|
import Effect.Class (liftEffect)
|
|
import Node.Encoding (Encoding(..))
|
|
import Partial.Unsafe (unsafePartial)
|
|
import Pipes (yield, (>->))
|
|
import Pipes (each) as Pipes
|
|
import Pipes.CSV as Pipes.CSV
|
|
import Pipes.Collect as Pipes.Collect
|
|
import Pipes.Node.Buffer as Pipes.Buffer
|
|
import Pipes.Node.Stream as Pipes.Stream
|
|
import Pipes.Prelude (map, toListM) as Pipes
|
|
import Pipes.Util as Pipes.Util
|
|
import Test.QuickCheck.Gen (randomSample')
|
|
import Test.Spec (Spec, describe, it)
|
|
import Test.Spec.Assertions (shouldEqual)
|
|
|
|
csv :: String
|
|
csv = """created,flag,foo,id
|
|
2020-01-01T00:00:00.0Z,true,a,1
|
|
2024-02-02T08:00:00.0Z,false,apple,2
|
|
1970-01-01T00:00:00.0Z,true,hello,3
|
|
"""
|
|
|
|
dt :: String -> DateTime
|
|
dt = toDateTimeLossy <<< unsafePartial fromJust <<< fromRFC3339String <<< wrap
|
|
|
|
spec :: Spec Unit
|
|
spec =
|
|
describe "Pipes.CSV" do
|
|
it "stringify" do
|
|
let
|
|
objs =
|
|
[ {id: 1, foo: "a", flag: true, created: dt "2020-01-01T00:00:00Z"}
|
|
, {id: 2, foo: "apple", flag: false, created: dt "2024-02-02T08:00:00Z"}
|
|
, {id: 3, foo: "hello", flag: true, created: dt "1970-01-01T00:00:00Z"}
|
|
]
|
|
|
|
csv' <- map fold $ Pipes.Collect.collectArray $ Pipes.Stream.withEOS (Pipes.each objs) >-> Pipes.CSV.stringify >-> Pipes.Stream.unEOS
|
|
csv' `shouldEqual` csv
|
|
describe "parse" do
|
|
it "parses csv" do
|
|
rows <- map Array.fromFoldable
|
|
$ Pipes.toListM
|
|
$ Pipes.Stream.withEOS (yield csv)
|
|
>-> Pipes.Stream.inEOS (Pipes.Buffer.fromString UTF8)
|
|
>-> Pipes.CSV.parse
|
|
>-> Pipes.Stream.unEOS
|
|
|
|
rows `shouldEqual`
|
|
[ {id: 1, foo: "a", flag: true, created: dt "2020-01-01T00:00:00Z"}
|
|
, {id: 2, foo: "apple", flag: false, created: dt "2024-02-02T08:00:00Z"}
|
|
, {id: 3, foo: "hello", flag: true, created: dt "1970-01-01T00:00:00Z"}
|
|
]
|
|
it "parses large csv" do
|
|
nums <- liftEffect $ randomSample' 100000 (chooseInt 0 9)
|
|
let
|
|
csvRows = ["id\n"] <> ((_ <> "\n") <$> show <$> nums)
|
|
csv' =
|
|
let
|
|
go ix
|
|
| Just a <- Array.index csvRows ix = yield a $> Loop (ix + 1)
|
|
| otherwise = pure $ Done unit
|
|
in
|
|
tailRecM go 0
|
|
in16kbChunks =
|
|
Pipes.Util.chunked 16000
|
|
>-> Pipes.Stream.inEOS (Pipes.map fold)
|
|
>-> Pipes.Stream.inEOS (Pipes.Buffer.fromString UTF8)
|
|
|
|
rows <-
|
|
Pipes.Collect.collectArray
|
|
$ Pipes.Stream.withEOS csv'
|
|
>-> in16kbChunks
|
|
>-> Pipes.CSV.parse
|
|
>-> Pipes.Stream.unEOS
|
|
|
|
rows `shouldEqual` ((\id -> {id}) <$> nums)
|