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module Minilang.REPLSpec where
import Control.Exception (bracket)
import Data.Text.IO
import Minilang.REPL
import System.Directory (getTemporaryDirectory, removeFile)
import System.FilePath ((<.>), (</>))
import System.IO (IOMode (..), hClose, withFile)
import System.Posix.Temp (mkstemp)
import Test.Hspec
import Prelude hiding (lines, readFile, writeFile)
spec :: Spec
spec = parallel $
describe "MiniLang REPL" $ do
it "evaluates untyped MiniLang terms read from pure Monad" $ do
let out =
withInput
["((lam (x) x) y)"]
out
`shouldBe` [ "Bye!",
"y : <?>"
]
it "evaluates untyped MiniLang terms with definitions" $ do
let out =
withInput
["(def id (lam (x) x))", "(id y)"]
out
`shouldBe` [ "Bye!",
"y : <?>",
"id : <?>"
]
it "defaults untyped terms" $ do
let out =
withInput
[ "(let ((Succ (lam (n z s) (s n))) \
\ (Zero (lam (z s) z))) \
\ (Succ (Succ Zero)))"
]
out
`shouldBe` [ "Bye!",
"(lam (z s) (s ((lam (n z s) (s n)) (lam (z s) z)))) : <?>"
]
it "do typecheck term when language is set to 'Typed'" $ do
let out =
withInput
[ ":lang Typed",
"(let ((Succ (lam (n z s) (s n))) \
\ (Zero (lam (z s) z))) \
\ (Succ (Succ Zero)))"
]
out
`shouldBe` [ "Bye!",
"Cannot unify type variable f with type (e -> f -> e) -> e due to circularity: The variable already occurs in the type.",
"Language set to Typed"
]
it "shows error when trying to load a non-existent file" $ do
withInput [":load foo"]
`shouldBe` [ "Bye!",
"REPLError \"cannot load file foo in Pure interpreter\""
]
around withTempFile $
it "evaluates single MiniLang term read from IO" $ \fileName -> do
let outputFileName = fileName <> ".out"
writeFile
fileName
"(let ((Succ (lam (n z s) (s n))) \
\ (Zero (lam (z s) z))) \
\ (Succ Zero))"
_ <- withFile fileName ReadMode $ \hin ->
withFile outputFileName AppendMode $ \hout ->
withHandles hin hout
out <- readFile outputFileName
out
`shouldBe` "\955\928> (lam (z s) (s (lam (z s) z))) : <?>\n\955\928> Bye!\n"
withTempFile :: (String -> IO ()) -> IO ()
withTempFile =
bracket mkTempFile rmTempFile
where
mkTempFile = getTemporaryDirectory >>= \dir -> mkstemp (dir </> "test-repl") >>= \(fp, h) -> hClose h >> pure fp
rmTempFile fn = removeFile fn >> removeFile (fn <.> "out")
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