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{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE OverloadedStrings #-}
{- |
Module : Text.Pandoc.Error
Copyright : Copyright (C) 2006-2020 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 Control.Exception (Exception)
import Data.Typeable (Typeable)
import Data.Word (Word8)
import Data.Text (Text)
import qualified Data.Text as T
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 = Text
data PandocError = PandocIOError Text IOError
| PandocHttpError Text HttpException
| PandocShouldNeverHappenError Text
| PandocSomeError Text
| PandocParseError Text
| PandocParsecError Input ParseError
| PandocMakePDFError Text
| PandocOptionError Text
| PandocSyntaxMapError Text
| PandocFailOnWarningError
| PandocPDFProgramNotFoundError Text
| PandocPDFError Text
| PandocFilterError Text Text
| PandocLuaError Text
| PandocCouldNotFindDataFileError Text
| PandocResourceNotFound Text
| PandocTemplateError Text
| PandocAppError Text
| PandocEpubSubdirectoryError Text
| PandocMacroLoop Text
| PandocUTF8DecodingError Text Int Word8
| PandocIpynbDecodingError Text
| PandocUnknownReaderError Text
| PandocUnknownWriterError Text
| PandocUnsupportedExtensionError Text Text
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" <> tshow err'
PandocShouldNeverHappenError s -> err 62 $
"Something we thought was impossible happened!\n" <>
"Please report this to pandoc's developers: " <> 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 = T.lines input <> [""]
errorInFile = if length ls > errLine - 1
then T.concat ["\n", ls !! (errLine - 1)
,"\n", T.replicate (errColumn - 1) " "
,"^"]
else ""
in err 65 $ "\nError at " <> tshow 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 66 s
PandocOptionError s -> err 6 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
PandocLuaError msg -> err 84 $ "Error running Lua:\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 4 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 " <> tshow offset <>
" (" <> T.pack (printf "%2x" w) <> ").\n" <>
"The input must be a UTF-8 encoded text."
PandocIpynbDecodingError w -> err 93 $
"ipynb decoding error: " <> w
PandocUnknownReaderError r -> err 21 $
"Unknown input format " <> r <>
case r of
"doc" -> "\nPandoc can convert from DOCX, but not from DOC." <>
"\nTry using Word to save your DOC file as DOCX," <>
" and convert that with pandoc."
"pdf" -> "\nPandoc can convert to PDF, but not from PDF."
_ -> ""
PandocUnknownWriterError w -> err 22 $
"Unknown output format " <> w <>
case w of
"pdf" -> "To create a pdf using pandoc, use" <>
" -t latex|beamer|context|ms|html5" <>
"\nand specify an output file with " <>
".pdf extension (-o filename.pdf)."
"doc" -> "\nPandoc can convert to DOCX, but not from DOC."
_ -> ""
PandocUnsupportedExtensionError ext f -> err 23 $
"The extension " <> ext <> " is not supported " <>
"for " <> f
err :: Int -> Text -> IO a
err exitCode msg = do
UTF8.hPutStrLn stderr (T.unpack msg)
exitWith $ ExitFailure exitCode
return undefined
tshow :: Show a => a -> Text
tshow = T.pack . show
|
