{-# LANGUAGE QuasiQuotes, OverloadedStrings, ExtendedDefaultRules, CPP #-}
-- Keep all the language pragmas here so it can be compiled separately.
module Main where
import Prelude
import GHC
import GHC.Paths
import Data.IORef
import Control.Monad
import Control.Monad.IO.Class ( MonadIO, liftIO )
import Data.List
import System.Directory
import Shelly (Sh, shelly, cmd, (</>), toTextIgnore, cd, withTmpDir, mkdir_p,
touchfile)
import qualified Shelly
import Control.Applicative ((<$>))
import Filesystem.Path.CurrentOS (encodeString)
import System.SetEnv (setEnv)
import Data.String.Here
import Data.String.Utils (strip, replace)
import Data.Monoid
import IHaskell.Eval.Parser
import IHaskell.Types
import IHaskell.IPython
import IHaskell.Eval.Evaluate as Eval hiding (liftIO)
import qualified IHaskell.Eval.Evaluate as Eval (liftIO)
import IHaskell.Eval.Completion
import IHaskell.Eval.ParseShell
import Debug.Trace
import Test.Hspec
import Test.Hspec.HUnit
import Test.HUnit (assertBool, assertFailure)
traceShowId x = traceShow x x
doGhc = runGhc (Just libdir)
parses str = do
res <- doGhc $ parseString str
return $ map unloc res
like parser desired = parser >>= (`shouldBe` desired)
is string blockType = do
result <- doGhc $ parseString string
map unloc result `shouldBe` [blockType $ strip string]
eval string = do
outputAccum <- newIORef []
pagerAccum <- newIORef []
let publish evalResult = case evalResult of
IntermediateResult {} -> return ()
FinalResult outs page [] -> do
modifyIORef outputAccum (outs :)
modifyIORef pagerAccum (page :)
getTemporaryDirectory >>= setCurrentDirectory
let state = defaultKernelState { getLintStatus = LintOff }
interpret libdir False $ Eval.evaluate state string publish
out <- readIORef outputAccum
pagerOut <- readIORef pagerAccum
return (reverse out, unlines $ reverse pagerOut)
evaluationComparing comparison string = do
let indent (' ':x) = 1 + indent x
indent _ = 0
empty = null . strip
stringLines = filter (not . empty) $ lines string
minIndent = minimum (map indent stringLines)
newString = unlines $ map (drop minIndent) stringLines
eval newString >>= comparison
becomes string expected = evaluationComparing comparison string
where
comparison :: ([Display], String) -> IO ()
comparison (results, pageOut) = do
when (length results /= length expected) $
expectationFailure $ "Expected result to have " ++ show (length expected)
++ " results. Got " ++ show results
forM_ (zip results expected) $ \(ManyDisplay [Display result], expected) ->
case extractPlain result of
"" -> expectationFailure $ "No plain-text output in " ++ show result ++ "\nExpected: " ++ expected
str -> str `shouldBe` expected
pages string expected = evaluationComparing comparison string
where
comparison (results, pageOut) =
strip (stripHtml pageOut) `shouldBe` strip (unlines expected)
-- A very, very hacky method for removing HTML
stripHtml str = go str
where
go ('<':str) = case stripPrefix "script" str of
Nothing -> go' str
Just str -> dropScriptTag str
go (x:xs) = x : go xs
go [] = []
go' ('>':str) = go str
go' (x:xs) = go' xs
go' [] = error $ "Unending bracket html tag in string " ++ str
dropScriptTag str = case stripPrefix "</script>" str of
Just str -> go str
Nothing -> dropScriptTag $ tail str
readCompletePrompt :: String -> (String, Int)
-- | @readCompletePrompt "xs*ys"@ return @(xs, i)@ where i is the location of
-- @'*'@ in the input string.
readCompletePrompt string = case elemIndex '*' string of
Nothing -> error "Expected cursor written as '*'."
Just idx -> (replace "*" "" string, idx)
completes string expected = completionTarget newString cursorloc `shouldBe` expected
where (newString, cursorloc) = readCompletePrompt string
completionEvent :: String -> Interpreter (String, [String])
completionEvent string = complete newString cursorloc
where (newString, cursorloc) = case elemIndex '*' string of
Nothing -> error "Expected cursor written as '*'."
Just idx -> (replace "*" "" string, idx)
completionEventInDirectory :: String -> IO (String, [String])
completionEventInDirectory string
= withHsDirectory $ const $ completionEvent string
shouldHaveCompletionsInDirectory :: String -> [String] -> IO ()
shouldHaveCompletionsInDirectory string expected = do
(matched, completions) <- completionEventInDirectory string
let existsInCompletion = (`elem` completions)
unmatched = filter (not . existsInCompletion) expected
expected `shouldBeAmong` completions
completionHas string expected
= do (matched, completions) <- doGhc $ do initCompleter
completionEvent string
let existsInCompletion = (`elem` completions)
unmatched = filter (not . existsInCompletion) expected
expected `shouldBeAmong` completions
initCompleter :: Interpreter ()
initCompleter = do
flags <- getSessionDynFlags
setSessionDynFlags $ flags { hscTarget = HscInterpreted, ghcLink = LinkInMemory }
-- Import modules.
imports <- mapM parseImportDecl ["import Prelude",
"import qualified Control.Monad",
"import qualified Data.List as List",
"import IHaskell.Display",
"import Data.Maybe as Maybe"]
setContext $ map IIDecl imports
inDirectory :: [Shelly.FilePath] -- ^ directories relative to temporary directory
-> [Shelly.FilePath] -- ^ files relative to temporary directory
-> (Shelly.FilePath -> Interpreter a)
-> IO a
-- | Run an Interpreter action, but first make a temporary directory
-- with some files and folder and cd to it.
inDirectory dirs files action = shelly $ withTmpDir $ \dirPath ->
do cd dirPath
mapM_ mkdir_p dirs
mapM_ touchfile files
liftIO $ doGhc $ wrap (encodeString dirPath) (action dirPath)
where cdEvent path = liftIO $ setCurrentDirectory path --Eval.evaluate defaultKernelState (":! cd " ++ path) noPublish
wrap :: FilePath -> Interpreter a -> Interpreter a
wrap path action =
do initCompleter
pwd <- Eval.liftIO getCurrentDirectory
cdEvent path -- change to the temporary directory
out <- action -- run action
cdEvent pwd -- change back to the original directory
return out
withHsDirectory :: (Shelly.FilePath -> Interpreter a) -> IO a
withHsDirectory = inDirectory ["" </> "dir", "dir" </> "dir1"]
[""</> "file1.hs", "dir" </> "file2.hs",
"" </> "file1.lhs", "dir" </> "file2.lhs"]
main :: IO ()
main = hspec $ do
parserTests
evalTests
completionTests
completionTests = do
parseShellTests
describe "Completion" $ do
it "correctly gets the completion identifier without dots" $ do
"hello*" `completes` ["hello"]
"hello aa*bb goodbye" `completes` ["aa"]
"hello aabb* goodbye" `completes` ["aabb"]
"aacc* goodbye" `completes` ["aacc"]
"hello *aabb goodbye" `completes` []
"*aabb goodbye" `completes` []
it "correctly gets the completion identifier with dots" $ do
"hello test.aa*bb goodbye" `completes` ["test", "aa"]
"Test.*" `completes` ["Test", ""]
"Test.Thing*" `completes` ["Test", "Thing"]
"Test.Thing.*" `completes` ["Test", "Thing", ""]
"Test.Thing.*nope" `completes` ["Test", "Thing", ""]
it "correctly gets the completion type" $ do
completionType "import Data." 12 ["Data", ""] `shouldBe` ModuleName "Data" ""
completionType "import Prel" 11 ["Prel"] `shouldBe` ModuleName "" "Prel"
completionType "import D.B.M" 12 ["D", "B", "M"] `shouldBe` ModuleName "D.B" "M"
completionType " import A." 10 ["A", ""] `shouldBe` ModuleName "A" ""
completionType "import a.x" 10 ["a", "x"] `shouldBe` Identifier "x"
completionType "A.x" 3 ["A", "x"] `shouldBe` Qualified "A" "x"
completionType "a.x" 3 ["a", "x"] `shouldBe` Identifier "x"
completionType "pri" 3 ["pri"] `shouldBe` Identifier "pri"
completionType ":load A" 7 ["A"] `shouldBe` HsFilePath ":load A"
"A"
completionType ":! cd " 6 [""] `shouldBe` FilePath ":! cd " ""
it "properly completes identifiers" $ do
"pri*" `completionHas` ["print"]
"ma*" `completionHas` ["map"]
"hello ma*" `completionHas` ["map"]
"print $ catMa*" `completionHas` ["catMaybes"]
it "properly completes qualified identifiers" $ do
"Control.Monad.liftM*" `completionHas` [ "Control.Monad.liftM"
, "Control.Monad.liftM2"
, "Control.Monad.liftM5"]
"print $ List.intercal*" `completionHas` ["List.intercalate"]
"print $ Data.Maybe.cat*" `completionHas` ["Data.Maybe.catMaybes"]
"print $ Maybe.catM*" `completionHas` ["Maybe.catMaybes"]
it "properly completes imports" $ do
"import Data.*" `completionHas` ["Data.Maybe", "Data.List"]
"import Data.M*" `completionHas` ["Data.Maybe"]
"import Prel*" `completionHas` ["Prelude"]
it "properly completes haskell file paths on :load directive" $
let loading xs = ":load " ++ encodeString xs
paths = map encodeString
in do
loading ("dir" </> "file*") `shouldHaveCompletionsInDirectory` paths ["dir" </> "file2.hs",
"dir" </> "file2.lhs"]
loading ("" </> "file1*") `shouldHaveCompletionsInDirectory` paths ["" </> "file1.hs",
"" </> "file1.lhs"]
loading ("" </> "file1*") `shouldHaveCompletionsInDirectory` paths ["" </> "file1.hs",
"" </> "file1.lhs"]
loading ("" </> "./*") `shouldHaveCompletionsInDirectory` paths ["./" </> "dir/"
, "./" </> "file1.hs"
, "./" </> "file1.lhs"]
loading ("" </> "./*") `shouldHaveCompletionsInDirectory` paths ["./" </> "dir/"
, "./" </> "file1.hs"
, "./" </> "file1.lhs"]
it "provides path completions on empty shell cmds " $
":! cd *" `shouldHaveCompletionsInDirectory` map encodeString ["" </> "dir/"
, "" </> "file1.hs"
, "" </> "file1.lhs"]
let withHsHome action = withHsDirectory $ \dirPath-> do
home <- shelly $ Shelly.get_env_text "HOME"
setHomeEvent dirPath
result <- action
setHomeEvent $ Shelly.fromText home
return result
setHomeEvent path = liftIO $ setEnv "HOME" (encodeString path)
it "correctly interprets ~ as the environment HOME variable" $
let shouldHaveCompletions :: String -> [String] -> IO ()
shouldHaveCompletions string expected = do
(matched, completions) <- withHsHome $ completionEvent string
let existsInCompletion = (`elem` completions)
unmatched = filter (not . existsInCompletion) expected
expected `shouldBeAmong` completions
in do
":! cd ~/*" `shouldHaveCompletions` ["~/dir/"]
":! ~/*" `shouldHaveCompletions` ["~/dir/"]
":load ~/*" `shouldHaveCompletions` ["~/dir/"]
":l ~/*" `shouldHaveCompletions` ["~/dir/"]
let shouldHaveMatchingText :: String -> String -> IO ()
shouldHaveMatchingText string expected = do
matchText <- withHsHome $ fst <$> uncurry complete (readCompletePrompt string)
matchText `shouldBe` expected
setHomeEvent path = liftIO $ setEnv "HOME" (encodeString path)
it "generates the correct matchingText on `:! cd ~/*` " $
do ":! cd ~/*" `shouldHaveMatchingText` ("~/" :: String)
it "generates the correct matchingText on `:load ~/*` " $
do ":load ~/*" `shouldHaveMatchingText` ("~/" :: String)
it "generates the correct matchingText on `:l ~/*` " $
do ":l ~/*" `shouldHaveMatchingText` ("~/" :: String)
evalTests = do
describe "Code Evaluation" $ do
it "evaluates expressions" $ do
"3" `becomes` ["3"]
"3+5" `becomes` ["8"]
"print 3" `becomes` ["3"]
[hereLit|
let x = 11
z = 10 in
x+z
|] `becomes` ["21"]
it "evaluates flags" $ do
":set -package hello" `becomes` ["Warning: -package not supported yet"]
":set -XNoImplicitPrelude" `becomes` []
it "evaluates multiline expressions" $ do
[hereLit|
import Control.Monad
forM_ [1, 2, 3] $ \x ->
print x
|] `becomes` ["1\n2\n3"]
it "evaluates function declarations silently" $ do
[hereLit|
fun :: [Int] -> Int
fun [] = 3
fun (x:xs) = 10
fun [1, 2]
|] `becomes` ["10"]
it "evaluates data declarations" $ do
[hereLit|
data X = Y Int
| Z String
deriving (Show, Eq)
print [Y 3, Z "No"]
print (Y 3 == Z "No")
|] `becomes` ["[Y 3,Z \"No\"]", "False"]
it "evaluates do blocks in expressions" $ do
[hereLit|
show (show (do
Just 10
Nothing
Just 100))
|] `becomes` ["\"\\\"Nothing\\\"\""]
it "is silent for imports" $ do
"import Control.Monad" `becomes` []
"import qualified Control.Monad" `becomes` []
"import qualified Control.Monad as CM" `becomes` []
"import Control.Monad (when)" `becomes` []
it "evaluates directives" $ do
":typ 3" `becomes` ["3 :: forall a. Num a => a"]
":k Maybe" `becomes` ["Maybe :: * -> *"]
#if MIN_VERSION_ghc(7, 8, 0)
":in String" `pages` ["type String = [Char] \t-- Defined in \8216GHC.Base\8217"]
#else
":in String" `pages` ["type String = [Char] \t-- Defined in `GHC.Base'"]
#endif
parserTests = do
layoutChunkerTests
moduleNameTests
parseStringTests
layoutChunkerTests = describe "Layout Chunk" $ do
it "chunks 'a string'" $
map unloc (layoutChunks "a string") `shouldBe` ["a string"]
it "chunks 'a\\n string'" $
map unloc (layoutChunks "a\n string") `shouldBe` ["a\n string"]
it "chunks 'a\\n string\\nextra'" $
map unloc (layoutChunks "a\n string\nextra") `shouldBe` ["a\n string","extra"]
it "chunks strings with too many lines" $
map unloc (layoutChunks "a\n\nstring") `shouldBe` ["a","string"]
it "parses multiple exprs" $ do
let text = [hereLit|
first
second
third
fourth
|]
layoutChunks text `shouldBe`
[Located 2 "first",
Located 4 "second",
Located 5 "third",
Located 7 "fourth"]
moduleNameTests = describe "Get Module Name" $ do
it "parses simple module names" $
"module A where\nx = 3" `named` ["A"]
it "parses module names with dots" $
"module A.B where\nx = 3" `named` ["A", "B"]
it "parses module names with exports" $
"module A.B.C ( x ) where x = 3" `named` ["A", "B", "C"]
it "errors when given unnamed modules" $ do
doGhc (getModuleName "x = 3") `shouldThrow` anyException
where
named str result = do
res <- doGhc $ getModuleName str
res `shouldBe` result
parseStringTests = describe "Parser" $ do
it "parses empty strings" $
parses "" `like` []
it "parses simple imports" $
"import Data.Monoid" `is` Import
it "parses simple arithmetic" $
"3 + 5" `is` Expression
it "parses :type" $
parses ":type x\n:ty x" `like` [
Directive GetType "x",
Directive GetType "x"
]
it "parses :info" $
parses ":info x\n:in x" `like` [
Directive GetInfo "x",
Directive GetInfo "x"
]
it "parses :help and :?" $
parses ":? x\n:help x" `like` [
Directive GetHelp "x",
Directive GetHelp "x"
]
it "parses :set x" $
parses ":set x" `like` [
Directive SetDynFlag "x"
]
it "parses :extension x" $
parses ":ex x\n:extension x" `like` [
Directive SetExtension "x",
Directive SetExtension "x"
]
it "fails to parse :nope" $
parses ":nope goodbye" `like` [
ParseError (Loc 1 1) "Unknown directive: 'nope'."
]
it "parses number followed by let stmt" $
parses "3\nlet x = expr" `like` [
Expression "3",
Statement "let x = expr"
]
it "parses let x in y" $
"let x = 3 in x + 3" `is` Expression
it "parses a data declaration" $
"data X = Y Int" `is` Declaration
it "parses number followed by type directive" $
parses "3\n:t expr" `like` [
Expression "3",
Directive GetType "expr"
]
it "parses a <- statement" $
"y <- print 'no'" `is` Statement
it "parses a <- stmt followed by let stmt" $
parses "y <- do print 'no'\nlet x = expr" `like` [
Statement "y <- do print 'no'",
Statement "let x = expr"
]
it "parses <- followed by let followed by expr" $
parses "y <- do print 'no'\nlet x = expr\nexpression" `like` [
Statement "y <- do print 'no'",
Statement "let x = expr",
Expression "expression"
]
it "parses two print statements" $
parses "print yes\nprint no" `like` [
Expression "print yes",
Expression "print no"
]
it "parses a pattern-maching function declaration" $
"fun [] = 10" `is` Declaration
it "parses a function decl followed by an expression" $
parses "fun [] = 10\nprint 'h'" `like` [
Declaration "fun [] = 10",
Expression "print 'h'"
]
it "parses list pattern matching fun decl" $
"fun (x : xs) = 100" `is` Declaration
it "parses two pattern matches as the same declaration" $
"fun [] = 10\nfun (x : xs) = 100" `is` Declaration
it "parses a type signature followed by a declaration" $
"fun :: [a] -> Int\nfun [] = 10\nfun (x : xs) = 100" `is` Declaration
it "parases a simple module" $
"module A where x = 3" `is` Module
it "parses a module with an export" $
"module B (x) where x = 3" `is` Module
it "breaks when a let is incomplete" $
parses "let x = 3 in" `like` [
ParseError (Loc 1 13) "parse error (possibly incorrect indentation or mismatched brackets)"
]
it "breaks without data kinds" $
parses "data X = 3" `like` [
#if MIN_VERSION_ghc(7, 8, 0)
ParseError (Loc 1 10) "Illegal literal in type (use DataKinds to enable): 3"
#else
ParseError (Loc 1 10) "Illegal literal in type (use -XDataKinds to enable): 3"
#endif
]
it "parses statements after imports" $ do
parses "import X\nprint 3" `like` [
Import "import X",
Expression "print 3"
]
parses "import X\n\nprint 3" `like` [
Import "import X",
Expression "print 3"
]
it "ignores blank lines properly" $
[hereLit|
test arg = hello
where
x = y
z = w
|] `is` Declaration
it "doesn't break on long strings" $ do
let longString = concat $ replicate 20 "hello "
("img ! src \"" ++ longString ++ "\" ! width \"500\"") `is` Expression
it "parses do blocks in expression" $ do
[hereLit|
show (show (do
Just 10
Nothing
Just 100))
|] `is` Expression
it "correctly locates parsed items" $ do
let go = doGhc . parseString
go [hereLit|
first
second
|] >>= (`shouldBe` [Located 2 (Expression "first"),
Located 4 (Expression "second")])
parseShellTests =
describe "Parsing Shell Commands" $ do
test "A" ["A"]
test ":load A" [":load", "A"]
test ":!l ~/Downloads/MyFile\\ Has\\ Spaces.txt"
[":!l", "~/Downloads/MyFile\\ Has\\ Spaces.txt"]
test ":!l \"~/Downloads/MyFile Has Spaces.txt\" /Another/File\\ WithSpaces.doc"
[":!l", "~/Downloads/MyFile Has Spaces.txt", "/Another/File\\ WithSpaces.doc" ]
where
test string expected =
it ("parses " ++ string ++ " correctly") $
string `shouldParseTo` expected
shouldParseTo xs ys = fun ys (parseShell xs)
where fun ys (Right xs') = xs' `shouldBe` ys
fun ys (Left e) = assertFailure $ "parseShell returned error: \n" ++ show e
-- Useful HSpec expectations ----
---------------------------------
shouldBeAmong :: (Show a, Eq a) => [a] -> [a] -> Expectation
-- |
-- @sublist \`shouldbeAmong\` list@ sets the expectation that @sublist@ elements are
-- among those in @list@.
sublist `shouldBeAmong` list = assertBool errorMsg
$ and [x `elem` list | x <- sublist]
where
errorMsg = show list ++ " doesn't contain " ++ show sublist