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{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE DeriveGeneric #-}
{- |
Module : Text.Pandoc.Error
Copyright : Copyright (C) 2006-2019 John MacFarlane
License : GNU GPL, version 2 or above
Maintainer : John MacFarlane <jgm@berkeley.edu>
Stability : alpha
Portability : portable
This module provides a standard way to deal with possible errors encounted
during parsing.
-}
module Text.Pandoc.Error (
PandocError(..),
handleError) where
import Prelude
import Control.Exception (Exception)
import Data.Typeable (Typeable)
import Data.Word (Word8)
import GHC.Generics (Generic)
import Network.HTTP.Client (HttpException)
import System.Exit (ExitCode (..), exitWith)
import System.IO (stderr)
import qualified Text.Pandoc.UTF8 as UTF8
import Text.Printf (printf)
import Text.Parsec.Error
import Text.Parsec.Pos hiding (Line)
type Input = String
data PandocError = PandocIOError String IOError
| PandocHttpError String HttpException
| PandocShouldNeverHappenError String
| PandocSomeError String
| PandocParseError String
| PandocParsecError Input ParseError
| PandocMakePDFError String
| PandocOptionError String
| PandocSyntaxMapError String
| PandocFailOnWarningError
| PandocPDFProgramNotFoundError String
| PandocPDFError String
| PandocFilterError String String
| PandocCouldNotFindDataFileError String
| PandocResourceNotFound String
| PandocTemplateError String
| PandocAppError String
| PandocEpubSubdirectoryError String
| PandocMacroLoop String
| PandocUTF8DecodingError String Int Word8
| PandocIpynbDecodingError String
deriving (Show, Typeable, Generic)
instance Exception PandocError
-- | Handle PandocError by exiting with an error message.
handleError :: Either PandocError a -> IO a
handleError (Right r) = return r
handleError (Left e) =
case e of
PandocIOError _ err' -> ioError err'
PandocHttpError u err' -> err 61 $
"Could not fetch " ++ u ++ "\n" ++ show err'
PandocShouldNeverHappenError s -> err 62 s
PandocSomeError s -> err 63 s
PandocParseError s -> err 64 s
PandocParsecError input err' ->
let errPos = errorPos err'
errLine = sourceLine errPos
errColumn = sourceColumn errPos
ls = lines input ++ [""]
errorInFile = if length ls > errLine - 1
then concat ["\n", ls !! (errLine - 1)
,"\n", replicate (errColumn - 1) ' '
,"^"]
else ""
in err 65 $ "\nError at " ++ show err' ++
-- if error comes from a chunk or included file,
-- then we won't get the right text this way:
if sourceName errPos == "source"
then errorInFile
else ""
PandocMakePDFError s -> err 65 s
PandocOptionError s -> err 2 s
PandocSyntaxMapError s -> err 67 s
PandocFailOnWarningError -> err 3 "Failing because there were warnings."
PandocPDFProgramNotFoundError pdfprog -> err 47 $
pdfprog ++ " not found. Please select a different --pdf-engine or install " ++ pdfprog
PandocPDFError logmsg -> err 43 $ "Error producing PDF.\n" ++ logmsg
PandocFilterError filtername msg -> err 83 $ "Error running filter " ++
filtername ++ ":\n" ++ msg
PandocCouldNotFindDataFileError fn -> err 97 $
"Could not find data file " ++ fn
PandocResourceNotFound fn -> err 99 $
"File " ++ fn ++ " not found in resource path"
PandocTemplateError s -> err 5 $ "Error compiling template " ++ s
PandocAppError s -> err 1 s
PandocEpubSubdirectoryError s -> err 31 $
"EPUB subdirectory name '" ++ s ++ "' contains illegal characters"
PandocMacroLoop s -> err 91 $
"Loop encountered in expanding macro " ++ s
PandocUTF8DecodingError f offset w -> err 92 $
"UTF-8 decoding error in " ++ f ++ " at byte offset " ++ show offset ++
" (" ++ printf "%2x" w ++ ").\n" ++
"The input must be a UTF-8 encoded text."
PandocIpynbDecodingError w -> err 93 $
"ipynb decoding error: " ++ w
err :: Int -> String -> IO a
err exitCode msg = do
UTF8.hPutStrLn stderr msg
exitWith $ ExitFailure exitCode
return undefined
|
