{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE DeriveGeneric      #-}
{-# LANGUAGE OverloadedStrings  #-}
{- |
   Module      : Text.Pandoc.Error
   Copyright   : Copyright (C) 2006-2021 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
encountered during parsing.

-}
module Text.Pandoc.Error (
  PandocError(..),
  renderError,
  handleError) where

import Control.Exception (Exception, displayException)
import Data.Typeable (Typeable)
import Data.Word (Word8)
import Data.Text (Text)
import Data.List (sortOn)
import qualified Data.Text as T
import Data.Ord (Down(..))
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.Pandoc.Sources (Sources(..))
import Text.Printf (printf)
import Text.Parsec.Error
import Text.Parsec.Pos hiding (Line)
import Text.Pandoc.Shared (tshow)
import Citeproc (CiteprocError, prettyCiteprocError)

data PandocError = PandocIOError Text IOError
                 | PandocHttpError Text HttpException
                 | PandocShouldNeverHappenError Text
                 | PandocSomeError Text
                 | PandocParseError Text
                 | PandocParsecError Sources ParseError
                 | PandocMakePDFError Text
                 | PandocOptionError Text
                 | PandocSyntaxMapError Text
                 | PandocFailOnWarningError
                 | PandocPDFProgramNotFoundError Text
                 | PandocPDFError Text
                 | PandocXMLError Text Text
                 | PandocFilterError Text Text
                 | PandocLuaError Text
                 | PandocCouldNotFindDataFileError Text
                 | PandocResourceNotFound Text
                 | PandocTemplateError Text
                 | PandocAppError Text
                 | PandocEpubSubdirectoryError Text
                 | PandocMacroLoop Text
                 | PandocUTF8DecodingError Text Int Word8
                 | PandocIpynbDecodingError Text
                 | PandocUnsupportedCharsetError Text
                 | PandocUnknownReaderError Text
                 | PandocUnknownWriterError Text
                 | PandocUnsupportedExtensionError Text Text
                 | PandocCiteprocError CiteprocError
                 | PandocBibliographyError Text Text
                 deriving (Int -> PandocError -> ShowS
[PandocError] -> ShowS
PandocError -> String
(Int -> PandocError -> ShowS)
-> (PandocError -> String)
-> ([PandocError] -> ShowS)
-> Show PandocError
forall a.
(Int -> a -> ShowS) -> (a -> String) -> ([a] -> ShowS) -> Show a
showList :: [PandocError] -> ShowS
$cshowList :: [PandocError] -> ShowS
show :: PandocError -> String
$cshow :: PandocError -> String
showsPrec :: Int -> PandocError -> ShowS
$cshowsPrec :: Int -> PandocError -> ShowS
Show, Typeable, (forall x. PandocError -> Rep PandocError x)
-> (forall x. Rep PandocError x -> PandocError)
-> Generic PandocError
forall x. Rep PandocError x -> PandocError
forall x. PandocError -> Rep PandocError x
forall a.
(forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a
$cto :: forall x. Rep PandocError x -> PandocError
$cfrom :: forall x. PandocError -> Rep PandocError x
Generic)

instance Exception PandocError

renderError :: PandocError -> Text
renderError :: PandocError -> Text
renderError PandocError
e =
  case PandocError
e of
    PandocIOError Text
_ IOError
err' -> String -> Text
T.pack (String -> Text) -> String -> Text
forall a b. (a -> b) -> a -> b
$ IOError -> String
forall e. Exception e => e -> String
displayException IOError
err'
    PandocHttpError Text
u HttpException
err' ->
      Text
"Could not fetch " Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
u Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
"\n" Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> HttpException -> Text
forall a. Show a => a -> Text
tshow HttpException
err'
    PandocShouldNeverHappenError Text
s ->
      Text
"Something we thought was impossible happened!\n" Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<>
      Text
"Please report this to pandoc's developers: " Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
s
    PandocSomeError Text
s -> Text
s
    PandocParseError Text
s -> Text
s
    PandocParsecError (Sources [(SourcePos, Text)]
inputs) ParseError
err' ->
        let errPos :: SourcePos
errPos = ParseError -> SourcePos
errorPos ParseError
err'
            errLine :: Int
errLine = SourcePos -> Int
sourceLine SourcePos
errPos
            errColumn :: Int
errColumn = SourcePos -> Int
sourceColumn SourcePos
errPos
            errFile :: String
errFile = SourcePos -> String
sourceName SourcePos
errPos
            errorInFile :: Text
errorInFile =
              case ((SourcePos, Text) -> Down Int)
-> [(SourcePos, Text)] -> [(SourcePos, Text)]
forall b a. Ord b => (a -> b) -> [a] -> [a]
sortOn (Int -> Down Int
forall a. a -> Down a
Down (Int -> Down Int)
-> ((SourcePos, Text) -> Int) -> (SourcePos, Text) -> Down Int
forall b c a. (b -> c) -> (a -> b) -> a -> c
. SourcePos -> Int
sourceLine (SourcePos -> Int)
-> ((SourcePos, Text) -> SourcePos) -> (SourcePos, Text) -> Int
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (SourcePos, Text) -> SourcePos
forall a b. (a, b) -> a
fst)
                      [ (SourcePos
pos,Text
t)
                        | (SourcePos
pos,Text
t) <- [(SourcePos, Text)]
inputs
                        , SourcePos -> String
sourceName SourcePos
pos String -> String -> Bool
forall a. Eq a => a -> a -> Bool
== String
errFile
                        , SourcePos -> Int
sourceLine SourcePos
pos Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
<= Int
errLine
                      ] of
                []  -> Text
""
                ((SourcePos
pos,Text
txt):[(SourcePos, Text)]
_) ->
                  let ls :: [Text]
ls = Text -> [Text]
T.lines Text
txt [Text] -> [Text] -> [Text]
forall a. Semigroup a => a -> a -> a
<> [Text
""]
                      ln :: Int
ln = (Int
errLine Int -> Int -> Int
forall a. Num a => a -> a -> a
- SourcePos -> Int
sourceLine SourcePos
pos) Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1
                   in if [Text] -> Int
forall (t :: * -> *) a. Foldable t => t a -> Int
length [Text]
ls Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
> Int
ln Bool -> Bool -> Bool
&& Int
ln Int -> Int -> Bool
forall a. Ord a => a -> a -> Bool
>= Int
1
                         then [Text] -> Text
T.concat [Text
"\n", [Text]
ls [Text] -> Int -> Text
forall a. [a] -> Int -> a
!! (Int
ln Int -> Int -> Int
forall a. Num a => a -> a -> a
- Int
1)
                                       ,Text
"\n", Int -> Text -> Text
T.replicate (Int
errColumn Int -> Int -> Int
forall a. Num a => a -> a -> a
- Int
1) Text
" "
                                       ,Text
"^"]
                         else Text
""
        in  Text
"Error at " Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> ParseError -> Text
forall a. Show a => a -> Text
tshow  ParseError
err' Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
errorInFile
    PandocMakePDFError Text
s -> Text
s
    PandocOptionError Text
s -> Text
s
    PandocSyntaxMapError Text
s -> Text
s
    PandocError
PandocFailOnWarningError -> Text
"Failing because there were warnings."
    PandocPDFProgramNotFoundError Text
pdfprog ->
        Text
pdfprog Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
" not found. Please select a different --pdf-engine or install " Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
pdfprog
    PandocPDFError Text
logmsg -> Text
"Error producing PDF.\n" Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
logmsg
    PandocXMLError Text
fp Text
logmsg -> Text
"Invalid XML" Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<>
        (if Text -> Bool
T.null Text
fp then Text
"" else Text
" in " Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
fp) Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
":\n" Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
logmsg
    PandocFilterError Text
filtername Text
msg -> Text
"Error running filter " Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<>
        Text
filtername Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
":\n" Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
msg
    PandocLuaError Text
msg -> Text
"Error running Lua:\n" Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
msg
    PandocCouldNotFindDataFileError Text
fn ->
        Text
"Could not find data file " Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
fn
    PandocResourceNotFound Text
fn ->
        Text
"File " Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
fn Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
" not found in resource path"
    PandocTemplateError Text
s -> Text
"Error compiling template " Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
s
    PandocAppError Text
s -> Text
s
    PandocEpubSubdirectoryError Text
s ->
      Text
"EPUB subdirectory name '" Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
s Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
"' contains illegal characters"
    PandocMacroLoop Text
s ->
      Text
"Loop encountered in expanding macro " Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
s
    PandocUTF8DecodingError Text
f Int
offset Word8
w ->
      Text
"UTF-8 decoding error in " Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
f Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
" at byte offset " Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Int -> Text
forall a. Show a => a -> Text
tshow Int
offset Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<>
      Text
" (" Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> String -> Text
T.pack (String -> Word8 -> String
forall r. PrintfType r => String -> r
printf String
"%2x" Word8
w) Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
").\n" Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<>
      Text
"The input must be a UTF-8 encoded text."
    PandocIpynbDecodingError Text
w ->
      Text
"ipynb decoding error: " Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
w
    PandocUnsupportedCharsetError Text
charset ->
      Text
"Unsupported charset " Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
charset
    PandocUnknownReaderError Text
r ->
      Text
"Unknown input format " Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
r Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<>
      case Text
r of
        Text
"doc" -> Text
"\nPandoc can convert from DOCX, but not from DOC." Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<>
                 Text
"\nTry using Word to save your DOC file as DOCX," Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<>
                 Text
" and convert that with pandoc."
        Text
"pdf" -> Text
"\nPandoc can convert to PDF, but not from PDF."
        Text
_     -> Text
""
    PandocUnknownWriterError Text
w ->
       Text
"Unknown output format " Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
w Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<>
       case Text
w of
         Text
"pdf" -> Text
"To create a pdf using pandoc, use" Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<>
                  Text
" -t latex|beamer|context|ms|html5" Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<>
                 Text
"\nand specify an output file with " Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<>
                 Text
".pdf extension (-o filename.pdf)."
         Text
"doc" -> Text
"\nPandoc can convert to DOCX, but not to DOC."
         Text
_     -> Text
""
    PandocUnsupportedExtensionError Text
ext Text
f ->
      Text
"The extension " Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
ext Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
" is not supported " Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<>
      Text
"for " Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
f
    PandocCiteprocError CiteprocError
e' ->
      CiteprocError -> Text
prettyCiteprocError CiteprocError
e'
    PandocBibliographyError Text
fp Text
msg ->
      Text
"Error reading bibliography file " Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
fp Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
":\n" Text -> Text -> Text
forall a. Semigroup a => a -> a -> a
<> Text
msg


-- | Handle PandocError by exiting with an error message.
handleError :: Either PandocError a -> IO a
handleError :: Either PandocError a -> IO a
handleError (Right a
r) = a -> IO a
forall (m :: * -> *) a. Monad m => a -> m a
return a
r
handleError (Left PandocError
e) =
  case PandocError
e of
    PandocIOError Text
_ IOError
err' -> IOError -> IO a
forall a. IOError -> IO a
ioError IOError
err'
    PandocError
_ -> Int -> Text -> IO a
forall a. Int -> Text -> IO a
err Int
exitCode (PandocError -> Text
renderError PandocError
e)
 where
  exitCode :: Int
exitCode =
    case PandocError
e of
      PandocIOError{} -> Int
1
      PandocHttpError{} -> Int
61
      PandocShouldNeverHappenError{} -> Int
62
      PandocSomeError{} -> Int
63
      PandocParseError{} -> Int
64
      PandocParsecError{} -> Int
65
      PandocMakePDFError{} -> Int
66
      PandocOptionError{} -> Int
6
      PandocSyntaxMapError{} -> Int
67
      PandocFailOnWarningError{} -> Int
3
      PandocPDFProgramNotFoundError{} -> Int
47
      PandocPDFError{} -> Int
43
      PandocXMLError{} -> Int
44
      PandocFilterError{} -> Int
83
      PandocLuaError{} -> Int
84
      PandocCouldNotFindDataFileError{} -> Int
97
      PandocResourceNotFound{} -> Int
99
      PandocTemplateError{} -> Int
5
      PandocAppError{} -> Int
4
      PandocEpubSubdirectoryError{} -> Int
31
      PandocMacroLoop{} -> Int
91
      PandocUTF8DecodingError{} -> Int
92
      PandocIpynbDecodingError{} -> Int
93
      PandocUnsupportedCharsetError{} -> Int
94
      PandocUnknownReaderError{} -> Int
21
      PandocUnknownWriterError{} -> Int
22
      PandocUnsupportedExtensionError{} -> Int
23
      PandocCiteprocError{} -> Int
24
      PandocBibliographyError{} -> Int
25

err :: Int -> Text -> IO a
err :: Int -> Text -> IO a
err Int
exitCode Text
msg = do
  Handle -> Text -> IO ()
UTF8.hPutStrLn Handle
stderr Text
msg
  ExitCode -> IO Any
forall a. ExitCode -> IO a
exitWith (ExitCode -> IO Any) -> ExitCode -> IO Any
forall a b. (a -> b) -> a -> b
$ Int -> ExitCode
ExitFailure Int
exitCode
  a -> IO a
forall (m :: * -> *) a. Monad m => a -> m a
return a
forall a. HasCallStack => a
undefined