{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE ViewPatterns #-}
{-# OPTIONS_GHC -fno-warn-orphans #-}
module Ormolu.Parser
( parseModule,
manualExts,
)
where
import Control.Exception
import Control.Monad.Except
import Data.Char (isSpace)
import Data.Functor
import Data.Generics
import qualified Data.List as L
import qualified Data.List.NonEmpty as NE
import Data.Ord (Down (Down))
import GHC.Data.Bag (bagToList)
import qualified GHC.Data.EnumSet as EnumSet
import qualified GHC.Data.FastString as GHC
import qualified GHC.Data.StringBuffer as GHC
import qualified GHC.Driver.CmdLine as GHC
import GHC.Driver.Session as GHC
import GHC.DynFlags (baseDynFlags)
import GHC.Hs hiding (UnicodeSyntax)
import GHC.LanguageExtensions.Type (Extension (..))
import qualified GHC.Parser as GHC
import GHC.Parser.Errors.Ppr (pprError)
import qualified GHC.Parser.Header as GHC
import qualified GHC.Parser.Lexer as GHC
import qualified GHC.Types.SourceError as GHC (handleSourceError)
import GHC.Types.SrcLoc
import GHC.Utils.Error (Severity (..), errMsgSeverity, errMsgSpan)
import qualified GHC.Utils.Panic as GHC
import Ormolu.Config
import Ormolu.Exception
import Ormolu.Fixity (LazyFixityMap)
import Ormolu.Parser.CommentStream
import Ormolu.Parser.Result
import Ormolu.Processing.Common
import Ormolu.Processing.Preprocess
import Ormolu.Utils (incSpanLine)
parseModule ::
MonadIO m =>
Config RegionDeltas ->
LazyFixityMap ->
FilePath ->
String ->
m
( [GHC.Warn],
Either (SrcSpan, String) [SourceSnippet]
)
parseModule :: forall (m :: * -> *).
MonadIO m =>
Config RegionDeltas
-> LazyFixityMap
-> String
-> String
-> m ([Warn], Either (SrcSpan, String) [SourceSnippet])
parseModule config :: Config RegionDeltas
config@Config {Bool
[DynOption]
Set String
FixityMap
PrinterOptsTotal
ColorMode
RegionDeltas
SourceType
cfgPrinterOpts :: forall region. Config region -> PrinterOptsTotal
cfgRegion :: forall region. Config region -> region
cfgColorMode :: forall region. Config region -> ColorMode
cfgSourceType :: forall region. Config region -> SourceType
cfgCheckIdempotence :: forall region. Config region -> Bool
cfgDebug :: forall region. Config region -> Bool
cfgUnsafe :: forall region. Config region -> Bool
cfgDependencies :: forall region. Config region -> Set String
cfgFixityOverrides :: forall region. Config region -> FixityMap
cfgDynOptions :: forall region. Config region -> [DynOption]
cfgPrinterOpts :: PrinterOptsTotal
cfgRegion :: RegionDeltas
cfgColorMode :: ColorMode
cfgSourceType :: SourceType
cfgCheckIdempotence :: Bool
cfgDebug :: Bool
cfgUnsafe :: Bool
cfgDependencies :: Set String
cfgFixityOverrides :: FixityMap
cfgDynOptions :: [DynOption]
..} LazyFixityMap
fixityMap String
path String
rawInput = forall (m :: * -> *) a. MonadIO m => IO a -> m a
liftIO forall a b. (a -> b) -> a -> b
$ do
let baseFlags :: DynFlags
baseFlags =
GeneralFlag -> DynFlags -> DynFlags
GHC.setGeneralFlag'
GeneralFlag
GHC.Opt_Haddock
(DynFlags -> DynFlags
setDefaultExts DynFlags
baseDynFlags)
extraOpts :: [Located String]
extraOpts = DynOption -> Located String
dynOptionToLocatedStr forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> [DynOption]
cfgDynOptions
([Warn]
warnings, DynFlags
dynFlags) <-
DynFlags
-> [Located String]
-> String
-> String
-> IO (Either String ([Warn], DynFlags))
parsePragmasIntoDynFlags DynFlags
baseFlags [Located String]
extraOpts String
path String
rawInput forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
>>= \case
Right ([Warn], DynFlags)
res -> forall (f :: * -> *) a. Applicative f => a -> f a
pure ([Warn], DynFlags)
res
Left String
err ->
let loc :: SrcSpan
loc =
SrcLoc -> SrcLoc -> SrcSpan
mkSrcSpan
(FastString -> Int -> Int -> SrcLoc
mkSrcLoc (String -> FastString
GHC.mkFastString String
path) Int
1 Int
1)
(FastString -> Int -> Int -> SrcLoc
mkSrcLoc (String -> FastString
GHC.mkFastString String
path) Int
1 Int
1)
in forall e a. Exception e => e -> IO a
throwIO (SrcSpan -> String -> OrmoluException
OrmoluParsingFailed SrcSpan
loc String
err)
let cppEnabled :: Bool
cppEnabled = forall a. Enum a => a -> EnumSet a -> Bool
EnumSet.member Extension
Cpp (DynFlags -> EnumSet Extension
GHC.extensionFlags DynFlags
dynFlags)
Either (SrcSpan, String) [SourceSnippet]
snippets <- forall e (m :: * -> *) a. ExceptT e m a -> m (Either e a)
runExceptT forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall (t :: * -> *) (m :: * -> *) a b.
(Traversable t, Monad m) =>
t a -> (a -> m b) -> m (t b)
forM (Bool -> RegionDeltas -> String -> [Either Text RegionDeltas]
preprocess Bool
cppEnabled RegionDeltas
cfgRegion String
rawInput) forall a b. (a -> b) -> a -> b
$ \case
Right RegionDeltas
region ->
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap ParseResult -> SourceSnippet
ParsedSnippet forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall e (m :: * -> *) a. m (Either e a) -> ExceptT e m a
ExceptT forall a b. (a -> b) -> a -> b
$
forall (m :: * -> *).
MonadIO m =>
Config RegionDeltas
-> LazyFixityMap
-> DynFlags
-> String
-> String
-> m (Either (SrcSpan, String) ParseResult)
parseModuleSnippet (Config RegionDeltas
config forall (f :: * -> *) a b. Functor f => f a -> b -> f b
$> RegionDeltas
region) LazyFixityMap
fixityMap DynFlags
dynFlags String
path String
rawInput
Left Text
raw -> forall (f :: * -> *) a. Applicative f => a -> f a
pure forall a b. (a -> b) -> a -> b
$ Text -> SourceSnippet
RawSnippet Text
raw
forall (f :: * -> *) a. Applicative f => a -> f a
pure ([Warn]
warnings, Either (SrcSpan, String) [SourceSnippet]
snippets)
parseModuleSnippet ::
MonadIO m =>
Config RegionDeltas ->
LazyFixityMap ->
DynFlags ->
FilePath ->
String ->
m (Either (SrcSpan, String) ParseResult)
parseModuleSnippet :: forall (m :: * -> *).
MonadIO m =>
Config RegionDeltas
-> LazyFixityMap
-> DynFlags
-> String
-> String
-> m (Either (SrcSpan, String) ParseResult)
parseModuleSnippet Config {Bool
[DynOption]
Set String
FixityMap
PrinterOptsTotal
ColorMode
RegionDeltas
SourceType
cfgPrinterOpts :: PrinterOptsTotal
cfgRegion :: RegionDeltas
cfgColorMode :: ColorMode
cfgSourceType :: SourceType
cfgCheckIdempotence :: Bool
cfgDebug :: Bool
cfgUnsafe :: Bool
cfgDependencies :: Set String
cfgFixityOverrides :: FixityMap
cfgDynOptions :: [DynOption]
cfgPrinterOpts :: forall region. Config region -> PrinterOptsTotal
cfgRegion :: forall region. Config region -> region
cfgColorMode :: forall region. Config region -> ColorMode
cfgSourceType :: forall region. Config region -> SourceType
cfgCheckIdempotence :: forall region. Config region -> Bool
cfgDebug :: forall region. Config region -> Bool
cfgUnsafe :: forall region. Config region -> Bool
cfgDependencies :: forall region. Config region -> Set String
cfgFixityOverrides :: forall region. Config region -> FixityMap
cfgDynOptions :: forall region. Config region -> [DynOption]
..} LazyFixityMap
fixityMap DynFlags
dynFlags String
path String
rawInput = forall (m :: * -> *) a. MonadIO m => IO a -> m a
liftIO forall a b. (a -> b) -> a -> b
$ do
let (String
input, Int
indent) = String -> (String, Int)
removeIndentation forall b c a. (b -> c) -> (a -> b) -> a -> c
. RegionDeltas -> String -> String
linesInRegion RegionDeltas
cfgRegion forall a b. (a -> b) -> a -> b
$ String
rawInput
let pStateErrors :: PState -> Maybe (SrcSpan, String)
pStateErrors PState
pstate =
let errs :: [MsgEnvelope DecoratedSDoc]
errs = forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap PsError -> MsgEnvelope DecoratedSDoc
pprError forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall a. Bag a -> [a]
bagToList forall a b. (a -> b) -> a -> b
$ PState -> Bag PsError
GHC.getErrorMessages PState
pstate
fixupErrSpan :: SrcSpan -> SrcSpan
fixupErrSpan = Int -> SrcSpan -> SrcSpan
incSpanLine (RegionDeltas -> Int
regionPrefixLength RegionDeltas
cfgRegion)
in case forall b a. Ord b => (a -> b) -> [a] -> [a]
L.sortOn (forall a. a -> Down a
Down forall b c a. (b -> c) -> (a -> b) -> a -> c
. Severity -> SeverityOrd
SeverityOrd forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall e. MsgEnvelope e -> Severity
errMsgSeverity) [MsgEnvelope DecoratedSDoc]
errs of
[] -> forall a. Maybe a
Nothing
MsgEnvelope DecoratedSDoc
err : [MsgEnvelope DecoratedSDoc]
_ ->
forall a. a -> Maybe a
Just (SrcSpan -> SrcSpan
fixupErrSpan (forall e. MsgEnvelope e -> SrcSpan
errMsgSpan MsgEnvelope DecoratedSDoc
err), forall a. Show a => a -> String
show MsgEnvelope DecoratedSDoc
err)
parser :: P (Located HsModule)
parser = case SourceType
cfgSourceType of
SourceType
ModuleSource -> P (Located HsModule)
GHC.parseModule
SourceType
SignatureSource -> P (Located HsModule)
GHC.parseSignature
r :: Either (SrcSpan, String) ParseResult
r = case forall a. P a -> DynFlags -> String -> String -> ParseResult a
runParser P (Located HsModule)
parser DynFlags
dynFlags String
path String
input of
GHC.PFailed PState
pstate ->
case PState -> Maybe (SrcSpan, String)
pStateErrors PState
pstate of
Just (SrcSpan, String)
err -> forall a b. a -> Either a b
Left (SrcSpan, String)
err
Maybe (SrcSpan, String)
Nothing -> forall a. HasCallStack => String -> a
error String
"PFailed does not have an error"
GHC.POk PState
pstate (L SrcSpan
_ (HsModule -> HsModule
normalizeModule -> HsModule
hsModule)) ->
case PState -> Maybe (SrcSpan, String)
pStateErrors PState
pstate of
Just (SrcSpan, String)
err -> forall a b. a -> Either a b
Left (SrcSpan, String)
err
Maybe (SrcSpan, String)
Nothing ->
let (Maybe (RealLocated Comment)
stackHeader, [([RealLocated Comment], Pragma)]
pragmas, CommentStream
comments) =
String
-> HsModule
-> (Maybe (RealLocated Comment), [([RealLocated Comment], Pragma)],
CommentStream)
mkCommentStream String
input HsModule
hsModule
in forall a b. b -> Either a b
Right
ParseResult
{ prParsedSource :: HsModule
prParsedSource = HsModule
hsModule,
prSourceType :: SourceType
prSourceType = SourceType
cfgSourceType,
prStackHeader :: Maybe (RealLocated Comment)
prStackHeader = Maybe (RealLocated Comment)
stackHeader,
prPragmas :: [([RealLocated Comment], Pragma)]
prPragmas = [([RealLocated Comment], Pragma)]
pragmas,
prCommentStream :: CommentStream
prCommentStream = CommentStream
comments,
prExtensions :: EnumSet Extension
prExtensions = DynFlags -> EnumSet Extension
GHC.extensionFlags DynFlags
dynFlags,
prFixityOverrides :: FixityMap
prFixityOverrides = FixityMap
cfgFixityOverrides,
prFixityMap :: LazyFixityMap
prFixityMap = LazyFixityMap
fixityMap,
prIndent :: Int
prIndent = Int
indent
}
forall (m :: * -> *) a. Monad m => a -> m a
return Either (SrcSpan, String) ParseResult
r
normalizeModule :: HsModule -> HsModule
normalizeModule :: HsModule -> HsModule
normalizeModule HsModule
hsmod =
(forall a. Data a => a -> a) -> forall a. Data a => a -> a
everywhere
(forall a b. (Typeable a, Typeable b) => (b -> b) -> a -> a
mkT GenLocated SrcSpanAnnA (HsType GhcPs)
-> GenLocated SrcSpanAnnA (HsType GhcPs)
dropBlankTypeHaddocks)
HsModule
hsmod
{ hsmodImports :: [LImportDecl GhcPs]
hsmodImports =
HsModule -> [LImportDecl GhcPs]
hsmodImports HsModule
hsmod,
hsmodDecls :: [LHsDecl GhcPs]
hsmodDecls =
forall a. (a -> Bool) -> [a] -> [a]
filter (Bool -> Bool
not forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall {p}. HsDecl p -> Bool
isBlankDocD forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall l e. GenLocated l e -> e
unLoc) (HsModule -> [LHsDecl GhcPs]
hsmodDecls HsModule
hsmod),
hsmodHaddockModHeader :: Maybe LHsDocString
hsmodHaddockModHeader =
forall (m :: * -> *) a. MonadPlus m => (a -> Bool) -> m a -> m a
mfilter (Bool -> Bool
not forall b c a. (b -> c) -> (a -> b) -> a -> c
. HsDocString -> Bool
isBlankDocString forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall l e. GenLocated l e -> e
unLoc) (HsModule -> Maybe LHsDocString
hsmodHaddockModHeader HsModule
hsmod),
hsmodExports :: Maybe (LocatedL [LIE GhcPs])
hsmodExports =
(forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap) (forall a. (a -> Bool) -> [a] -> [a]
filter (Bool -> Bool
not forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall {pass}. IE pass -> Bool
isBlankDocIE forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall l e. GenLocated l e -> e
unLoc)) (HsModule -> Maybe (LocatedL [LIE GhcPs])
hsmodExports HsModule
hsmod)
}
where
isBlankDocString :: HsDocString -> Bool
isBlankDocString = forall (t :: * -> *) a. Foldable t => (a -> Bool) -> t a -> Bool
all Char -> Bool
isSpace forall b c a. (b -> c) -> (a -> b) -> a -> c
. HsDocString -> String
unpackHDS
isBlankDocD :: HsDecl p -> Bool
isBlankDocD = \case
DocD XDocD p
_ DocDecl
s -> HsDocString -> Bool
isBlankDocString forall a b. (a -> b) -> a -> b
$ DocDecl -> HsDocString
docDeclDoc DocDecl
s
HsDecl p
_ -> Bool
False
isBlankDocIE :: IE pass -> Bool
isBlankDocIE = \case
IEGroup XIEGroup pass
_ Int
_ HsDocString
s -> HsDocString -> Bool
isBlankDocString HsDocString
s
IEDoc XIEDoc pass
_ HsDocString
s -> HsDocString -> Bool
isBlankDocString HsDocString
s
IE pass
_ -> Bool
False
dropBlankTypeHaddocks :: LHsType GhcPs -> LHsType GhcPs
dropBlankTypeHaddocks = \case
L SrcSpanAnnA
_ (HsDocTy XDocTy GhcPs
_ LHsType GhcPs
ty (L SrcSpan
_ HsDocString
ds)) :: LHsType GhcPs
| HsDocString -> Bool
isBlankDocString HsDocString
ds -> LHsType GhcPs
ty
LHsType GhcPs
a -> LHsType GhcPs
a
setDefaultExts :: DynFlags -> DynFlags
setDefaultExts :: DynFlags -> DynFlags
setDefaultExts DynFlags
flags = forall (t :: * -> *) b a.
Foldable t =>
(b -> a -> b) -> b -> t a -> b
L.foldl' DynFlags -> Extension -> DynFlags
xopt_set (DynFlags -> Maybe Language -> DynFlags
lang_set DynFlags
flags (forall a. a -> Maybe a
Just Language
Haskell2010)) [Extension]
autoExts
where
autoExts :: [Extension]
autoExts = [Extension]
allExts forall a. Eq a => [a] -> [a] -> [a]
L.\\ [Extension]
manualExts
allExts :: [Extension]
allExts = [forall a. Bounded a => a
minBound .. forall a. Bounded a => a
maxBound]
manualExts :: [Extension]
manualExts :: [Extension]
manualExts =
[ Extension
Arrows,
Extension
Cpp,
Extension
BangPatterns,
Extension
PatternSynonyms,
Extension
RecursiveDo,
Extension
StaticPointers,
Extension
TransformListComp,
Extension
UnboxedTuples,
Extension
MagicHash,
Extension
AlternativeLayoutRule,
Extension
AlternativeLayoutRuleTransitional,
Extension
MonadComprehensions,
Extension
UnboxedSums,
Extension
UnicodeSyntax,
Extension
TemplateHaskell,
Extension
TemplateHaskellQuotes,
Extension
ImportQualifiedPost,
Extension
NegativeLiterals,
Extension
LexicalNegation,
Extension
LinearTypes,
Extension
OverloadedRecordDot,
Extension
OverloadedRecordUpdate
]
runParser ::
GHC.P a ->
GHC.DynFlags ->
FilePath ->
String ->
GHC.ParseResult a
runParser :: forall a. P a -> DynFlags -> String -> String -> ParseResult a
runParser P a
parser DynFlags
flags String
filename String
input = forall a. P a -> PState -> ParseResult a
GHC.unP P a
parser PState
parseState
where
location :: RealSrcLoc
location = FastString -> Int -> Int -> RealSrcLoc
mkRealSrcLoc (String -> FastString
GHC.mkFastString String
filename) Int
1 Int
1
buffer :: StringBuffer
buffer = String -> StringBuffer
GHC.stringToStringBuffer String
input
parseState :: PState
parseState = ParserOpts -> StringBuffer -> RealSrcLoc -> PState
GHC.initParserState (DynFlags -> ParserOpts
opts DynFlags
flags) StringBuffer
buffer RealSrcLoc
location
opts :: DynFlags -> ParserOpts
opts =
EnumSet WarningFlag
-> EnumSet Extension -> Bool -> Bool -> Bool -> Bool -> ParserOpts
GHC.mkParserOpts
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> DynFlags -> EnumSet WarningFlag
GHC.warningFlags
forall (f :: * -> *) a b. Applicative f => f (a -> b) -> f a -> f b
<*> DynFlags -> EnumSet Extension
GHC.extensionFlags
forall (f :: * -> *) a b. Applicative f => f (a -> b) -> f a -> f b
<*> DynFlags -> Bool
GHC.safeImportsOn
forall (f :: * -> *) a b. Applicative f => f (a -> b) -> f a -> f b
<*> GeneralFlag -> DynFlags -> Bool
GHC.gopt GeneralFlag
GHC.Opt_Haddock
forall (f :: * -> *) a b. Applicative f => f (a -> b) -> f a -> f b
<*> GeneralFlag -> DynFlags -> Bool
GHC.gopt GeneralFlag
GHC.Opt_KeepRawTokenStream
forall (f :: * -> *) a b. Applicative f => f (a -> b) -> f a -> f b
<*> forall a b. a -> b -> a
const Bool
True
newtype SeverityOrd = SeverityOrd Severity
instance Eq SeverityOrd where
SeverityOrd
s1 == :: SeverityOrd -> SeverityOrd -> Bool
== SeverityOrd
s2 = forall a. Ord a => a -> a -> Ordering
compare SeverityOrd
s1 SeverityOrd
s2 forall a. Eq a => a -> a -> Bool
== Ordering
EQ
instance Ord SeverityOrd where
compare :: SeverityOrd -> SeverityOrd -> Ordering
compare (SeverityOrd Severity
s1) (SeverityOrd Severity
s2) =
forall a. Ord a => a -> a -> Ordering
compare (Severity -> Int
f Severity
s1) (Severity -> Int
f Severity
s2)
where
f :: Severity -> Int
f :: Severity -> Int
f Severity
SevOutput = Int
1
f Severity
SevFatal = Int
2
f Severity
SevInteractive = Int
3
f Severity
SevDump = Int
4
f Severity
SevInfo = Int
5
f Severity
SevWarning = Int
6
f Severity
SevError = Int
7
parsePragmasIntoDynFlags ::
DynFlags ->
[Located String] ->
FilePath ->
String ->
IO (Either String ([GHC.Warn], DynFlags))
parsePragmasIntoDynFlags :: DynFlags
-> [Located String]
-> String
-> String
-> IO (Either String ([Warn], DynFlags))
parsePragmasIntoDynFlags DynFlags
flags [Located String]
extraOpts String
filepath String
str =
forall {m :: * -> *} {b}.
(MonadMask m, MonadIO m) =>
m (Either String b) -> m (Either String b)
catchErrors forall a b. (a -> b) -> a -> b
$ do
let fileOpts :: [Located String]
fileOpts = DynFlags -> StringBuffer -> String -> [Located String]
GHC.getOptions DynFlags
flags (String -> StringBuffer
GHC.stringToStringBuffer String
str) String
filepath
(DynFlags
flags', [Located String]
leftovers, [Warn]
warnings) <-
forall (m :: * -> *).
MonadIO m =>
DynFlags
-> [Located String] -> m (DynFlags, [Located String], [Warn])
parseDynamicFilePragma DynFlags
flags ([Located String]
extraOpts forall a. Semigroup a => a -> a -> a
<> [Located String]
fileOpts)
case forall a. [a] -> Maybe (NonEmpty a)
NE.nonEmpty [Located String]
leftovers of
Maybe (NonEmpty (Located String))
Nothing -> forall (m :: * -> *) a. Monad m => a -> m a
return ()
Just NonEmpty (Located String)
unrecognizedOpts ->
forall e a. Exception e => e -> IO a
throwIO (NonEmpty String -> OrmoluException
OrmoluUnrecognizedOpts (forall l e. GenLocated l e -> e
unLoc forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> NonEmpty (Located String)
unrecognizedOpts))
let flags'' :: DynFlags
flags'' = DynFlags
flags' DynFlags -> GeneralFlag -> DynFlags
`gopt_set` GeneralFlag
Opt_KeepRawTokenStream
forall (m :: * -> *) a. Monad m => a -> m a
return forall a b. (a -> b) -> a -> b
$ forall a b. b -> Either a b
Right ([Warn]
warnings, DynFlags
flags'')
where
catchErrors :: m (Either String b) -> m (Either String b)
catchErrors m (Either String b)
act =
forall (m :: * -> *) a.
ExceptionMonad m =>
(GhcException -> m a) -> m a -> m a
GHC.handleGhcException
forall {m :: * -> *} {a} {b}.
(Monad m, Show a) =>
a -> m (Either String b)
reportErr
(forall (m :: * -> *) a.
MonadCatch m =>
(SourceError -> m a) -> m a -> m a
GHC.handleSourceError forall {m :: * -> *} {a} {b}.
(Monad m, Show a) =>
a -> m (Either String b)
reportErr m (Either String b)
act)
reportErr :: a -> m (Either String b)
reportErr a
e = forall (m :: * -> *) a. Monad m => a -> m a
return forall a b. (a -> b) -> a -> b
$ forall a b. a -> Either a b
Left (forall a. Show a => a -> String
show a
e)