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|
{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE TupleSections #-}
{- |
Module : Text.Pandoc.App.Input
Copyright : © 2006-2023 John MacFarlane
License : GPL-2.0-or-later
Maintainer : John MacFarlane <jgm@berkeley@edu>
Read from the file system into a pandoc document.
-}
module Text.Pandoc.App.Input
( InputParameters (..)
, readInput
) where
import Control.Monad ((>=>))
import Control.Monad.Except (throwError, catchError)
import Data.Text (Text)
import Network.URI (URI (..), parseURI, unEscapeString)
import Text.Pandoc.Class ( PandocMonad, openURL, toTextM
, readFileStrict, readStdinStrict, report)
import Text.Pandoc.Definition (Pandoc (..), Attr, Block (..), Inline (..))
import Text.Pandoc.Error (PandocError (..))
import Text.Pandoc.Logging (LogMessage (..))
import Text.Pandoc.MIME (getCharset, MimeType)
import Text.Pandoc.Options (Extensions, ReaderOptions (..))
import Text.Pandoc.Readers (Reader (..))
import Text.Pandoc.Shared (tabFilter, textToIdentifier)
import Text.Pandoc.URI (uriPathToPath)
import Text.Pandoc.Walk (walk)
import qualified Data.ByteString as BS
import qualified Data.ByteString.Char8 as B8
import qualified Data.ByteString.Lazy as BL
import qualified Data.Text as T
-- | Settings specifying how and which input should be processed.
data InputParameters m = InputParameters
{ inputReader :: Reader m
, inputReaderName :: Text
, inputReaderOptions :: ReaderOptions
, inputSources :: [FilePath]
, inputSpacesPerTab :: Maybe Int
, inputFileScope :: Bool
}
-- | Read all input into a pandoc document.
readInput :: PandocMonad m => InputParameters m -> m Pandoc
readInput params = do
let sources = inputSources params
let readerName = inputReaderName params
let readerOpts = inputReaderOptions params
let convertTabs :: Text -> Text
convertTabs = tabFilter $ case inputSpacesPerTab params of
Nothing -> 0
Just ts -> if readerName `elem` ["t2t", "man", "tsv"]
then 0
else ts
inputs <- readSources sources
case inputReader params of
TextReader r
| readerName == "json" ->
mconcat <$> mapM (inputToText convertTabs >=> r readerOpts . (:[]))
inputs
| inputFileScope params ->
mconcat <$> mapM
(\source -> do
(fp, txt) <- inputToText convertTabs source
adjustLinksAndIds (readerExtensions readerOpts)
(T.pack fp) (map (T.pack . fst) inputs)
<$> r readerOpts [(fp, txt)])
inputs
| otherwise -> mapM (inputToText convertTabs) inputs >>= r readerOpts
ByteStringReader r ->
mconcat <$> mapM (r readerOpts . inputToLazyByteString) inputs
readSources :: PandocMonad m
=> [FilePath] -> m [(FilePath, (BS.ByteString, Maybe MimeType))]
readSources srcs =
mapM (\fp -> do t <- readSource fp
return (if fp == "-" then "" else fp, t)) srcs
-- | Read input from a resource, i.e., either a file, a URL, or stdin
-- (@-@).
readSource :: PandocMonad m
=> FilePath -> m (BS.ByteString, Maybe MimeType)
readSource "-" = (,Nothing) <$> readStdinStrict
readSource src =
case parseURI src of
Just u | uriScheme u `elem` ["http:","https:"] -> openURL (T.pack src)
| uriScheme u == "file:" ->
(,Nothing) <$>
readFileStrict (uriPathToPath $ T.pack $ uriPath u)
_ -> (,Nothing) <$> readFileStrict src
inputToText :: PandocMonad m
=> (Text -> Text)
-> (FilePath, (BS.ByteString, Maybe MimeType))
-> m (FilePath, Text)
inputToText convTabs (fp, (bs,mt)) =
(fp,) . convTabs . T.filter (/='\r') <$>
case mt >>= getCharset of
Just "UTF-8" -> toTextM fp bs
Just "ISO-8859-1" -> return $ T.pack $ B8.unpack bs
Just charset -> throwError $ PandocUnsupportedCharsetError charset
Nothing -> catchError
(toTextM fp bs)
(\case
PandocUTF8DecodingError{} -> do
report $ NotUTF8Encoded
(if null fp
then "input"
else fp)
return $ T.pack $ B8.unpack bs
e -> throwError e)
inputToLazyByteString :: (FilePath, (BS.ByteString, Maybe MimeType))
-> BL.ByteString
inputToLazyByteString (_, (bs,_)) = BL.fromStrict bs
adjustLinksAndIds :: Extensions -> Text -> [Text] -> Pandoc -> Pandoc
adjustLinksAndIds exts thisfile allfiles
| length allfiles > 1 = addDiv . walk fixInline . walk fixBlock
| otherwise = id
where
toIdent :: Text -> Text
toIdent = textToIdentifier exts . T.intercalate "__" .
T.split (\c -> c == '/' || c == '\\')
addDiv :: Pandoc -> Pandoc
addDiv (Pandoc m bs)
| T.null thisfile = Pandoc m bs
| otherwise = Pandoc m [Div (toIdent thisfile,[],[]) bs]
fixBlock :: Block -> Block
fixBlock (CodeBlock attr t) = CodeBlock (fixAttrs attr) t
fixBlock (Header lev attr ils) = Header lev (fixAttrs attr) ils
fixBlock (Table attr cap cols th tbs tf) =
Table (fixAttrs attr) cap cols th tbs tf
fixBlock (Div attr bs) = Div (fixAttrs attr) bs
fixBlock x = x
-- add thisfile as prefix of identifier
fixAttrs :: Attr -> Attr
fixAttrs (i,cs,kvs)
| T.null i = (i,cs,kvs)
| otherwise =
(T.intercalate "__"
(filter (not . T.null) [toIdent thisfile, i]),
cs, kvs)
-- if URL begins with file from allfiles, convert to
-- an internal link with the appropriate identifier
fixURL :: Text -> Text
fixURL u =
let (a,b) = T.break (== '#') $ T.pack . unEscapeString . T.unpack $ u
filepart = if T.null a
then toIdent thisfile
else toIdent a
fragpart = T.dropWhile (== '#') b
in if T.null a || a `elem` allfiles
then "#" <> T.intercalate "__"
(filter (not . T.null) [filepart, fragpart])
else u
fixInline :: Inline -> Inline
fixInline (Code attr t) = Code (fixAttrs attr) t
fixInline (Link attr ils (url,tit)) =
Link (fixAttrs attr) ils (fixURL url,tit)
fixInline (Image attr ils (url,tit)) =
Image (fixAttrs attr) ils (fixURL url,tit)
fixInline (Span attr ils) = Span (fixAttrs attr) ils
fixInline x = x
|
