Compare commits
1 commit
| Author | SHA1 | Date | |
|---|---|---|---|
| 7eca875900 |
16 changed files with 137 additions and 1079 deletions
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@ -17,28 +17,19 @@ cabal-version: >=1.10
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library
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exposed-modules: PDF
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, PDF.CMap
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, PDF.EOL
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, PDF.Object
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, PDF.Output
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, PDF.Pages
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, PDF.Parser
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, PDF.Text
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, PDF.Update
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other-modules: Data.ByteString.Char8.Util
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, PDF.Encoding
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, PDF.Encoding.MacRoman
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, PDF.Body
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, PDF.Font
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, PDF.Parser
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-- other-extensions:
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build-depends: attoparsec
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, base >=4.9 && <4.13
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, bytestring
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, containers
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, mtl
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, text
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, utf8-string
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, zlib
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hs-source-dirs: src
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ghc-options: -Wall
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default-language: Haskell2010
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@ -60,15 +51,3 @@ executable getObj
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, zlib
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ghc-options: -Wall
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default-language: Haskell2010
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executable getText
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main-is: examples/getText.hs
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build-depends: base
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, bytestring
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, containers
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, Hufflepdf
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, mtl
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, text
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, zlib
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ghc-options: -Wall
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default-language: Haskell2010
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@ -4,16 +4,17 @@ import Codec.Compression.Zlib (decompress)
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import Data.ByteString.Lazy.Char8 (ByteString)
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import qualified Data.ByteString.Char8 as BS (readFile)
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import qualified Data.ByteString.Lazy.Char8 as Lazy (fromStrict, putStr, toStrict)
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import Data.Map ((!))
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import qualified Data.Map as Map (lookup)
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import Data.Map ((!?))
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import qualified Data.Map as Map (keys, lookup)
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import PDF (Document(..), parseDocument)
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import qualified PDF.EOL as EOL (Style)
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import PDF.Object (Content(..), DirectObject(..), Object(..), Name(..))
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import PDF.Output (ObjectId(..))
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import qualified PDF.Output as Output (render)
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import PDF.Update (unify)
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import System.Environment (getArgs)
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import System.IO (hPutStrLn, stderr)
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import System.Environment (getArgs, getProgName)
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import System.Exit (die)
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import Text.Printf (printf)
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display :: EOL.Style -> Object -> ByteString
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display eolStyle d@(Direct _) = Output.render eolStyle d
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@ -25,16 +26,28 @@ display eolStyle s@(Stream {header, streamContent}) = Output.render eolStyle $
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}
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_ -> s
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extractObject :: ObjectId -> Document -> ByteString
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extractObject :: ObjectId -> Document -> Either String ByteString
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extractObject objectId (Document {eolStyle, updates}) =
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display eolStyle . (!objectId) $ objects content
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case objects content !? objectId of
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Nothing -> Left $ "No object has ID " ++ show (getObjectId objectId)
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Just o -> Right $ display eolStyle o
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where
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content = unify updates
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listObjectIds :: Document -> Either String [String]
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listObjectIds =
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Right . prependTitle . toString . Map.keys . objects . unify . updates
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where
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toString = fmap (show . getObjectId)
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prependTitle = ("ObjectIds defined in this PDF:":)
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main :: IO ()
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main = do
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[inputFile, objectId] <- getArgs
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result <- parseDocument <$> BS.readFile inputFile
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case result of
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Left parseError -> hPutStrLn stderr parseError
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Right doc -> Lazy.putStr $ extractObject (ObjectId (read objectId)) doc
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(inputFile, getData) <- parse =<< getArgs
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input <- BS.readFile inputFile
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either die id $ (parseDocument input >>= getData)
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where
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parse [inputFile] = return (inputFile, fmap (mapM_ putStrLn) . listObjectIds)
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parse [inputFile, objectId] = return
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(inputFile, fmap Lazy.putStr . extractObject (ObjectId (read objectId)))
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parse _ = die . printf "Syntax: %s inputFile [OBJECT_ID]\n" =<< getProgName
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@ -1,38 +0,0 @@
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import qualified Data.ByteString.Char8 as BS (readFile)
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import qualified Data.Map as Map (toList)
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import qualified Data.Text.IO as Text (putStrLn)
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import PDF (Document(..), parseDocument)
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import PDF.Object (Content)
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import PDF.Pages (Page(..), get, getAll)
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import PDF.Update (unify)
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import System.Environment (getArgs)
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import System.Exit (die)
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import System.IO (BufferMode(..), hSetBuffering, stdout)
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onDoc :: FilePath -> (Content -> Either String a) -> IO a
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onDoc inputFile f = do
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content <- fmap (unify . updates) . parseDocument <$> BS.readFile inputFile
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case content >>= f of
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Left someError -> die someError
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Right value -> return value
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displayPage :: Page -> IO ()
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displayPage = mapM_ Text.putStrLn . contents
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wholeDoc :: FilePath -> IO ()
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wholeDoc inputFile = do
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pages <- onDoc inputFile getAll
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mapM_ (displayPage . snd) $ Map.toList pages
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singlePage :: FilePath -> Int -> IO ()
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singlePage inputFile pageNumber =
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onDoc inputFile (`get` pageNumber) >>= displayPage
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main :: IO ()
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main = do
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hSetBuffering stdout LineBuffering
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args <- getArgs
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case args of
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[inputFile] -> wholeDoc inputFile
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[inputFile, pageNumber] -> singlePage inputFile (read pageNumber)
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_ -> die "Syntax: getText INPUT_FILE [PAGE_NUMBER]"
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@ -1,91 +1,16 @@
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module Data.ByteString.Char8.Util (
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B16Int(..)
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, B256Int(..)
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, b8ToInt
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, b16ToBytes
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, b16ToInt
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, b256ToInt
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, intToB256
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, previous
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previous
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, subBS
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, toBytes
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, unescape
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, utf16BEToutf8
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) where
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import Data.ByteString (ByteString, snoc)
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import qualified Data.ByteString as BS (empty, foldl, length, pack, singleton, splitAt)
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import qualified Data.ByteString.Char8 as Char8 (
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cons, drop, index, splitAt, take, uncons, unpack
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)
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import Data.Text (Text)
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import Data.Text.Encoding (decodeUtf16BE)
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import Data.ByteString.Char8 (ByteString)
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import qualified Data.ByteString.Char8 as BS (drop, index, take)
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import Prelude hiding (length)
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import Text.Printf (printf)
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newtype B8Int = B8Int ByteString deriving Show
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newtype B16Int = B16Int ByteString deriving Show
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newtype B256Int = B256Int ByteString deriving Show
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previous :: Char -> Int -> ByteString -> Int
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previous char position byteString
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| Char8.index byteString position == char = position
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| BS.index byteString position == char = position
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| otherwise = previous char (position - 1) byteString
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subBS :: Int -> Int -> ByteString -> ByteString
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subBS offset length = Char8.take length . Char8.drop offset
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intToB256 :: Int -> B256Int
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intToB256 n
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| n < 0x100 = B256Int . BS.singleton $ toEnum n
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| otherwise =
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let B256Int begining = intToB256 (n `div` 0x100) in
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B256Int $ begining `snoc` (toEnum (n `mod` 0x100))
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b256ToInt :: B256Int -> Int
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b256ToInt (B256Int n) = BS.foldl (\k w -> 0x100*k + fromEnum w) 0 n
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toBytes :: Int -> Int -> ByteString
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toBytes 0 _ = BS.empty
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toBytes size n =
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(toBytes (size - 1) (n `div` 0x100)) `snoc` (toEnum (n `mod` 0x100))
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b16ToBytes :: B16Int -> ByteString
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b16ToBytes (B16Int n) = BS.pack . fmap b16ToInt $ pairDigits n
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where
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pairDigits s =
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case BS.length s of
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0 -> []
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1 -> [B16Int s]
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_ ->
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let (twoHexDigits, rest) = BS.splitAt 2 s in
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(B16Int $ twoHexDigits):(pairDigits rest)
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fromBase :: (Num a, Read a) => Char -> ByteString -> a
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fromBase b = read . printf "0%c%s" b . Char8.unpack
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b16ToInt :: (Num a, Read a) => B16Int -> a
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b16ToInt (B16Int n) = fromBase 'x' n
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b8ToInt :: (Num a, Read a) => B8Int -> a
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b8ToInt (B8Int n) = fromBase 'o' n
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unescape :: ByteString -> ByteString
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unescape escapedBS =
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case Char8.uncons escapedBS of
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Nothing -> BS.empty
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Just ('\\', s) -> unescapeChar s
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Just (c, s) -> Char8.cons c (unescape s)
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where
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unescapeChar s =
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case Char8.uncons s of
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Nothing -> BS.empty
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Just (c, s')
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| c `elem` "()" -> Char8.cons c (unescape s')
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| c `elem` "nrtbf" -> Char8.cons (read (printf "'\\%c'" c)) (unescape s')
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| c `elem` ['0'..'7'] -> fromOctal (Char8.splitAt 3 s)
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| otherwise -> Char8.cons c (unescape s')
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fromOctal (code, s) = Char8.cons (toEnum $ b8ToInt (B8Int code)) (unescape s)
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utf16BEToutf8 :: ByteString -> Text
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utf16BEToutf8 = decodeUtf16BE
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subBS offset length = BS.take length . BS.drop offset
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|
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@ -21,7 +21,7 @@ import PDF.Object (
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)
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import qualified PDF.Output as Output (render, line)
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import PDF.Output (Output(..))
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import PDF.Parser (Parser, evalParser, string, takeAll)
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import PDF.Parser (Parser, runParser, string, takeAll)
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import Text.Printf (printf)
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data Document = Document {
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@ -83,7 +83,7 @@ findNextSection offset input =
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readStructures :: Int -> ByteString -> Either String [InputStructure]
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readStructures startXref input =
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evalParser structure () (BS.drop startXref input) >>= stopOrFollow
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runParser structure () (BS.drop startXref input) >>= stopOrFollow
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where
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stopOrFollow s@(Structure {trailer}) =
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case Map.lookup (Name "Prev") trailer of
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@ -96,7 +96,7 @@ readStructures startXref input =
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parseDocument :: ByteString -> Either String Document
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parseDocument input = do
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(pdfVersion, eolStyle) <- evalParser ((,) <$> version <*> EOL.parser) () input
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(pdfVersion, eolStyle) <- runParser ((,) <$> version <*> EOL.parser) () input
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startXref <- readStartXref eolStyle input
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structuresRead <- readStructures startXref input
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let updates = populate input <$> structuresRead
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@ -6,7 +6,6 @@ module PDF.Body (
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import Control.Applicative ((<|>))
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import Control.Monad.State (get, gets, modify)
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import Data.Attoparsec.ByteString.Char8 (option)
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import Data.ByteString.Char8 (ByteString)
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import qualified Data.ByteString.Char8 as BS (cons, drop, unpack)
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import Data.Map ((!))
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@ -19,7 +18,7 @@ import PDF.Object (
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, blank, dictionary, directObject, integer, line
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)
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import PDF.Output (ObjectId(..), Offset(..))
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import PDF.Parser (Parser, (<?>), block, char, evalParser, on, takeAll)
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import PDF.Parser (Parser, (<?>), block, char, on, option, runParser, takeAll)
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data UserState = UserState {
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input :: ByteString
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@ -110,7 +109,7 @@ occurrence =
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populate :: ByteString -> InputStructure -> Content
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populate input structure =
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let bodyInput = BS.drop (startOffset structure) input in
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case evalParser recurseOnOccurrences initialState bodyInput of
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case runParser recurseOnOccurrences initialState bodyInput of
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Left _ -> Content {occurrences = [], objects = Map.empty, docStructure}
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Right finalState ->
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let Flow {occurrencesStack, tmpObjects} = flow finalState in
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|
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159
src/PDF/CMap.hs
159
src/PDF/CMap.hs
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@ -1,159 +0,0 @@
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{-# LANGUAGE NamedFieldPuns #-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE FlexibleInstances #-}
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{-# LANGUAGE TypeSynonymInstances #-}
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module PDF.CMap (
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CMap
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, CMappers
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, CRange(..)
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, cMap
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, emptyCMap
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, matches
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) where
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import Control.Applicative ((<|>), many)
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import Control.Monad.State (modify)
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import Data.Attoparsec.ByteString.Char8 (count)
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import Data.ByteString (ByteString)
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import qualified Data.ByteString as BS (drop, length, null, take)
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import Data.ByteString.Char8 (unpack)
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import Data.ByteString.Char8.Util (
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B16Int(..), b16ToBytes, b16ToInt, toBytes, utf16BEToutf8
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)
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import Data.Map (Map, union)
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import qualified Data.Map as Map (
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adjust, empty, fromList, insertWith, lookup, toList
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)
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import Data.Text (Text)
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import qualified PDF.EOL as EOL (charset, parser)
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import PDF.Font (Font)
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import PDF.Object (
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DirectObject(..), Name, StringObject(..)
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, blank, directObject, integer, line, stringObject
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)
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import PDF.Parser (MonadParser, Parser, runParser, takeAll)
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type CMappers = Map Name CMap
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type Mapping = Map ByteString Text
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data CRange = CRange {
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fromSequence :: ByteString
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, toSequence :: ByteString
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, mapping :: Mapping
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} deriving Show
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type RangeSize = Int
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type CMap = Map RangeSize [CRange]
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toFont :: CMap -> Font
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toFont aCMap input
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| BS.null input = Right ""
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| otherwise = do
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(output, remainingInput) <- trySizes input $ Map.toList aCMap
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mappend output <$> toFont aCMap remainingInput
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where
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trySizes s [] = Left $ "No matching code found in font for " ++ unpack s
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trySizes s ((size, cRanges):others) =
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let prefix = BS.take size s in
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case tryRanges prefix cRanges of
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Nothing -> trySizes s others
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Just outputSequence -> Right (outputSequence, BS.drop size s)
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tryRanges :: ByteString -> [CRange] -> Maybe Text
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tryRanges _ [] = Nothing
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tryRanges prefix ((CRange {mapping}):cRanges) =
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case Map.lookup prefix mapping of
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Nothing -> tryRanges prefix cRanges
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outputSequence -> outputSequence
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emptyCMap :: CMap
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emptyCMap = Map.empty
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matches :: ByteString -> CRange -> Bool
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matches code (CRange {fromSequence, toSequence}) =
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fromSequence <= code && code <= toSequence
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cMap :: ByteString -> Either String Font
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cMap = fmap (toFont . snd) <$> runParser
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(many (codeRanges <|> cMapRange <|> cMapChar <|> ignoredLine))
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emptyCMap
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where
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ignoredLine =
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takeAll (not . (`elem` EOL.charset)) *> EOL.parser *> return ()
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codeRanges :: Parser CMap ()
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codeRanges = do
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size <- integer <* line "begincodespacerange"
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mapM_ createMapping =<< count size codeRange
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line "endcodespacerange"
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where
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codeRange =
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(,) <$> stringObject <* blank <*> stringObject <* EOL.parser
|
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createMapping :: (StringObject, StringObject) -> Parser CMap ()
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createMapping (Hexadecimal from, Hexadecimal to) = modify $
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Map.insertWith (++) size [CRange {fromSequence, toSequence, mapping}]
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where
|
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fromSequence = b16ToBytes from
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size = BS.length fromSequence
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toSequence = b16ToBytes to
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mapping = Map.empty
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createMapping _ = return ()
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cMapRange :: Parser CMap ()
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cMapRange = do
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size <- integer <* line "beginbfrange"
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mapM_ saveMapping =<< count size rangeMapping
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line "endbfrange"
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where
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rangeMapping = (,,)
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<$> (stringObject <* blank)
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<*> (stringObject <* blank)
|
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<*> directObject <* EOL.parser
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>>= mapFromTo
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|
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saveMapping :: [(ByteString, Text)] -> Parser CMap ()
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saveMapping [] = return ()
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saveMapping assoc@((code, _):_) = modify $ Map.adjust insertCRange mappingSize
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where
|
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newMapping = Map.fromList assoc
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mappingSize = BS.length code
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appendMapping cRange =
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cRange {mapping = mapping cRange `union` newMapping}
|
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insertCRange = fmap (\cRange ->
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if code `matches` cRange then appendMapping cRange else cRange
|
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)
|
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|
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cMapChar :: Parser CMap ()
|
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cMapChar = do
|
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size <- integer <* line "beginbfchar"
|
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saveMapping =<< count size charMapping <* line "endbfchar"
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where
|
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charMapping =
|
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(,) <$> stringObject <* blank <*> stringObject <* EOL.parser
|
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>>= pairMapping
|
||||
|
||||
between :: B16Int -> B16Int -> [ByteString]
|
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between from@(B16Int s) to =
|
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let size = BS.length s `div` 2 in
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toBytes size <$> [b16ToInt from .. b16ToInt to]
|
||||
|
||||
startFrom :: B16Int -> [ByteString]
|
||||
startFrom from@(B16Int s) =
|
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let size = BS.length s `div` 2 in
|
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toBytes size <$> [b16ToInt from .. ]
|
||||
|
||||
mapFromTo :: MonadParser m => (StringObject, StringObject, DirectObject) -> m [(ByteString, Text)]
|
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mapFromTo (Hexadecimal from, Hexadecimal to, StringObject (Hexadecimal dstFrom)) =
|
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return $ zip (between from to) (utf16BEToutf8 <$> startFrom dstFrom)
|
||||
|
||||
mapFromTo (Hexadecimal from, Hexadecimal to, Array dstPoints) =
|
||||
zip (between from to) <$> (mapM dstByteString dstPoints)
|
||||
where
|
||||
dstByteString (StringObject (Hexadecimal dst)) =
|
||||
return . utf16BEToutf8 $ b16ToBytes dst
|
||||
dstByteString _ = fail "Invalid for a replacement string"
|
||||
|
||||
mapFromTo _ = fail "invalid range mapping found"
|
||||
|
||||
pairMapping :: MonadParser m => (StringObject, StringObject) -> m (ByteString, Text)
|
||||
pairMapping (Hexadecimal from, Hexadecimal to) =
|
||||
return (b16ToBytes from, utf16BEToutf8 $ b16ToBytes to)
|
||||
pairMapping _ = fail "invalid pair mapping found"
|
||||
|
|
@ -6,14 +6,14 @@ module PDF.EOL (
|
|||
) where
|
||||
|
||||
import Control.Applicative ((<|>))
|
||||
import PDF.Parser (MonadParser, string)
|
||||
import PDF.Parser (Parser, string)
|
||||
|
||||
data Style = CR | LF | CRLF deriving Show
|
||||
|
||||
charset :: String
|
||||
charset = "\r\n"
|
||||
|
||||
parser :: MonadParser m => m Style
|
||||
parser :: Parser s Style
|
||||
parser =
|
||||
(string "\r\n" >> return CRLF)
|
||||
<|> (string "\r" >> return CR)
|
||||
|
|
|
|||
|
|
@ -1,10 +0,0 @@
|
|||
module PDF.Encoding (
|
||||
encoding
|
||||
) where
|
||||
|
||||
import PDF.Encoding.MacRoman (macRomanEncoding)
|
||||
import PDF.Font (Font)
|
||||
|
||||
encoding :: String -> Either String Font
|
||||
encoding "MacRomanEncoding" = Right macRomanEncoding
|
||||
encoding s = Left $ "Unknown encoding " ++ s
|
||||
|
|
@ -1,141 +0,0 @@
|
|||
module PDF.Encoding.MacRoman (
|
||||
macRomanEncoding
|
||||
) where
|
||||
|
||||
import Data.ByteString.Char8 (unpack)
|
||||
import Data.Text (pack)
|
||||
import PDF.Font (Font)
|
||||
|
||||
macRomanEncoding :: Font
|
||||
macRomanEncoding = Right . pack . fmap decode . unpack
|
||||
|
||||
decode :: Char -> Char
|
||||
decode '\x80' = '\x00C4' -- LATIN CAPITAL LETTER A WITH DIAERESIS
|
||||
decode '\x81' = '\x00C5' -- LATIN CAPITAL LETTER A WITH RING ABOVE
|
||||
decode '\x82' = '\x00C7' -- LATIN CAPITAL LETTER C WITH CEDILLA
|
||||
decode '\x83' = '\x00C9' -- LATIN CAPITAL LETTER E WITH ACUTE
|
||||
decode '\x84' = '\x00D1' -- LATIN CAPITAL LETTER N WITH TILDE
|
||||
decode '\x85' = '\x00D6' -- LATIN CAPITAL LETTER O WITH DIAERESIS
|
||||
decode '\x86' = '\x00DC' -- LATIN CAPITAL LETTER U WITH DIAERESIS
|
||||
decode '\x87' = '\x00E1' -- LATIN SMALL LETTER A WITH ACUTE
|
||||
decode '\x88' = '\x00E0' -- LATIN SMALL LETTER A WITH GRAVE
|
||||
decode '\x89' = '\x00E2' -- LATIN SMALL LETTER A WITH CIRCUMFLEX
|
||||
decode '\x8A' = '\x00E4' -- LATIN SMALL LETTER A WITH DIAERESIS
|
||||
decode '\x8B' = '\x00E3' -- LATIN SMALL LETTER A WITH TILDE
|
||||
decode '\x8C' = '\x00E5' -- LATIN SMALL LETTER A WITH RING ABOVE
|
||||
decode '\x8D' = '\x00E7' -- LATIN SMALL LETTER C WITH CEDILLA
|
||||
decode '\x8E' = '\x00E9' -- LATIN SMALL LETTER E WITH ACUTE
|
||||
decode '\x8F' = '\x00E8' -- LATIN SMALL LETTER E WITH GRAVE
|
||||
decode '\x90' = '\x00EA' -- LATIN SMALL LETTER E WITH CIRCUMFLEX
|
||||
decode '\x91' = '\x00EB' -- LATIN SMALL LETTER E WITH DIAERESIS
|
||||
decode '\x92' = '\x00ED' -- LATIN SMALL LETTER I WITH ACUTE
|
||||
decode '\x93' = '\x00EC' -- LATIN SMALL LETTER I WITH GRAVE
|
||||
decode '\x94' = '\x00EE' -- LATIN SMALL LETTER I WITH CIRCUMFLEX
|
||||
decode '\x95' = '\x00EF' -- LATIN SMALL LETTER I WITH DIAERESIS
|
||||
decode '\x96' = '\x00F1' -- LATIN SMALL LETTER N WITH TILDE
|
||||
decode '\x97' = '\x00F3' -- LATIN SMALL LETTER O WITH ACUTE
|
||||
decode '\x98' = '\x00F2' -- LATIN SMALL LETTER O WITH GRAVE
|
||||
decode '\x99' = '\x00F4' -- LATIN SMALL LETTER O WITH CIRCUMFLEX
|
||||
decode '\x9A' = '\x00F6' -- LATIN SMALL LETTER O WITH DIAERESIS
|
||||
decode '\x9B' = '\x00F5' -- LATIN SMALL LETTER O WITH TILDE
|
||||
decode '\x9C' = '\x00FA' -- LATIN SMALL LETTER U WITH ACUTE
|
||||
decode '\x9D' = '\x00F9' -- LATIN SMALL LETTER U WITH GRAVE
|
||||
decode '\x9E' = '\x00FB' -- LATIN SMALL LETTER U WITH CIRCUMFLEX
|
||||
decode '\x9F' = '\x00FC' -- LATIN SMALL LETTER U WITH DIAERESIS
|
||||
decode '\xA0' = '\x2020' -- DAGGER
|
||||
decode '\xA1' = '\x00B0' -- DEGREE SIGN
|
||||
decode '\xA2' = '\x00A2' -- CENT SIGN
|
||||
decode '\xA3' = '\x00A3' -- POUND SIGN
|
||||
decode '\xA4' = '\x00A7' -- SECTION SIGN
|
||||
decode '\xA5' = '\x2022' -- BULLET
|
||||
decode '\xA6' = '\x00B6' -- PILCROW SIGN
|
||||
decode '\xA7' = '\x00DF' -- LATIN SMALL LETTER SHARP S
|
||||
decode '\xA8' = '\x00AE' -- REGISTERED SIGN
|
||||
decode '\xA9' = '\x00A9' -- COPYRIGHT SIGN
|
||||
decode '\xAA' = '\x2122' -- TRADE MARK SIGN
|
||||
decode '\xAB' = '\x00B4' -- ACUTE ACCENT
|
||||
decode '\xAC' = '\x00A8' -- DIAERESIS
|
||||
decode '\xAD' = '\x2260' -- NOT EQUAL TO
|
||||
decode '\xAE' = '\x00C6' -- LATIN CAPITAL LETTER AE
|
||||
decode '\xAF' = '\x00D8' -- LATIN CAPITAL LETTER O WITH STROKE
|
||||
decode '\xB0' = '\x221E' -- INFINITY
|
||||
decode '\xB1' = '\x00B1' -- PLUS-MINUS SIGN
|
||||
decode '\xB2' = '\x2264' -- LESS-THAN OR EQUAL TO
|
||||
decode '\xB3' = '\x2265' -- GREATER-THAN OR EQUAL TO
|
||||
decode '\xB4' = '\x00A5' -- YEN SIGN
|
||||
decode '\xB5' = '\x00B5' -- MICRO SIGN
|
||||
decode '\xB6' = '\x2202' -- PARTIAL DIFFERENTIAL
|
||||
decode '\xB7' = '\x2211' -- N-ARY SUMMATION
|
||||
decode '\xB8' = '\x220F' -- N-ARY PRODUCT
|
||||
decode '\xB9' = '\x03C0' -- GREEK SMALL LETTER PI
|
||||
decode '\xBA' = '\x222B' -- INTEGRAL
|
||||
decode '\xBB' = '\x00AA' -- FEMININE ORDINAL INDICATOR
|
||||
decode '\xBC' = '\x00BA' -- MASCULINE ORDINAL INDICATOR
|
||||
decode '\xBD' = '\x03A9' -- GREEK CAPITAL LETTER OMEGA
|
||||
decode '\xBE' = '\x00E6' -- LATIN SMALL LETTER AE
|
||||
decode '\xBF' = '\x00F8' -- LATIN SMALL LETTER O WITH STROKE
|
||||
decode '\xC0' = '\x00BF' -- INVERTED QUESTION MARK
|
||||
decode '\xC1' = '\x00A1' -- INVERTED EXCLAMATION MARK
|
||||
decode '\xC2' = '\x00AC' -- NOT SIGN
|
||||
decode '\xC3' = '\x221A' -- SQUARE ROOT
|
||||
decode '\xC4' = '\x0192' -- LATIN SMALL LETTER F WITH HOOK
|
||||
decode '\xC5' = '\x2248' -- ALMOST EQUAL TO
|
||||
decode '\xC6' = '\x2206' -- INCREMENT
|
||||
decode '\xC7' = '\x00AB' -- LEFT-POINTING DOUBLE ANGLE QUOTATION MARK
|
||||
decode '\xC8' = '\x00BB' -- RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK
|
||||
decode '\xC9' = '\x2026' -- HORIZONTAL ELLIPSIS
|
||||
decode '\xCA' = '\x00A0' -- NO-BREAK SPACE
|
||||
decode '\xCB' = '\x00C0' -- LATIN CAPITAL LETTER A WITH GRAVE
|
||||
decode '\xCC' = '\x00C3' -- LATIN CAPITAL LETTER A WITH TILDE
|
||||
decode '\xCD' = '\x00D5' -- LATIN CAPITAL LETTER O WITH TILDE
|
||||
decode '\xCE' = '\x0152' -- LATIN CAPITAL LIGATURE OE
|
||||
decode '\xCF' = '\x0153' -- LATIN SMALL LIGATURE OE
|
||||
decode '\xD0' = '\x2013' -- EN DASH
|
||||
decode '\xD1' = '\x2014' -- EM DASH
|
||||
decode '\xD2' = '\x201C' -- LEFT DOUBLE QUOTATION MARK
|
||||
decode '\xD3' = '\x201D' -- RIGHT DOUBLE QUOTATION MARK
|
||||
decode '\xD4' = '\x2018' -- LEFT SINGLE QUOTATION MARK
|
||||
decode '\xD5' = '\x2019' -- RIGHT SINGLE QUOTATION MARK
|
||||
decode '\xD6' = '\x00F7' -- DIVISION SIGN
|
||||
decode '\xD7' = '\x25CA' -- LOZENGE
|
||||
decode '\xD8' = '\x00FF' -- LATIN SMALL LETTER Y WITH DIAERESIS
|
||||
decode '\xD9' = '\x0178' -- LATIN CAPITAL LETTER Y WITH DIAERESIS
|
||||
decode '\xDA' = '\x2044' -- FRACTION SLASH
|
||||
decode '\xDB' = '\x20AC' -- EURO SIGN
|
||||
decode '\xDC' = '\x2039' -- SINGLE LEFT-POINTING ANGLE QUOTATION MARK
|
||||
decode '\xDD' = '\x203A' -- SINGLE RIGHT-POINTING ANGLE QUOTATION MARK
|
||||
decode '\xDE' = '\xFB01' -- LATIN SMALL LIGATURE FI
|
||||
decode '\xDF' = '\xFB02' -- LATIN SMALL LIGATURE FL
|
||||
decode '\xE0' = '\x2021' -- DOUBLE DAGGER
|
||||
decode '\xE1' = '\x00B7' -- MIDDLE DOT
|
||||
decode '\xE2' = '\x201A' -- SINGLE LOW-9 QUOTATION MARK
|
||||
decode '\xE3' = '\x201E' -- DOUBLE LOW-9 QUOTATION MARK
|
||||
decode '\xE4' = '\x2030' -- PER MILLE SIGN
|
||||
decode '\xE5' = '\x00C2' -- LATIN CAPITAL LETTER A WITH CIRCUMFLEX
|
||||
decode '\xE6' = '\x00CA' -- LATIN CAPITAL LETTER E WITH CIRCUMFLEX
|
||||
decode '\xE7' = '\x00C1' -- LATIN CAPITAL LETTER A WITH ACUTE
|
||||
decode '\xE8' = '\x00CB' -- LATIN CAPITAL LETTER E WITH DIAERESIS
|
||||
decode '\xE9' = '\x00C8' -- LATIN CAPITAL LETTER E WITH GRAVE
|
||||
decode '\xEA' = '\x00CD' -- LATIN CAPITAL LETTER I WITH ACUTE
|
||||
decode '\xEB' = '\x00CE' -- LATIN CAPITAL LETTER I WITH CIRCUMFLEX
|
||||
decode '\xEC' = '\x00CF' -- LATIN CAPITAL LETTER I WITH DIAERESIS
|
||||
decode '\xED' = '\x00CC' -- LATIN CAPITAL LETTER I WITH GRAVE
|
||||
decode '\xEE' = '\x00D3' -- LATIN CAPITAL LETTER O WITH ACUTE
|
||||
decode '\xEF' = '\x00D4' -- LATIN CAPITAL LETTER O WITH CIRCUMFLEX
|
||||
decode '\xF0' = '\xF8FF' -- Apple logo
|
||||
decode '\xF1' = '\x00D2' -- LATIN CAPITAL LETTER O WITH GRAVE
|
||||
decode '\xF2' = '\x00DA' -- LATIN CAPITAL LETTER U WITH ACUTE
|
||||
decode '\xF3' = '\x00DB' -- LATIN CAPITAL LETTER U WITH CIRCUMFLEX
|
||||
decode '\xF4' = '\x00D9' -- LATIN CAPITAL LETTER U WITH GRAVE
|
||||
decode '\xF5' = '\x0131' -- LATIN SMALL LETTER DOTLESS I
|
||||
decode '\xF6' = '\x02C6' -- MODIFIER LETTER CIRCUMFLEX ACCENT
|
||||
decode '\xF7' = '\x02DC' -- SMALL TILDE
|
||||
decode '\xF8' = '\x00AF' -- MACRON
|
||||
decode '\xF9' = '\x02D8' -- BREVE
|
||||
decode '\xFA' = '\x02D9' -- DOT ABOVE
|
||||
decode '\xFB' = '\x02DA' -- RING ABOVE
|
||||
decode '\xFC' = '\x00B8' -- CEDILLA
|
||||
decode '\xFD' = '\x02DD' -- DOUBLE ACUTE ACCENT
|
||||
decode '\xFE' = '\x02DB' -- OGONEK
|
||||
decode '\xFF' = '\x02C7' -- CARON
|
||||
decode c = c -- The rest is ASCII
|
||||
|
|
@ -1,16 +0,0 @@
|
|||
module PDF.Font (
|
||||
Font
|
||||
, FontSet
|
||||
, emptyFont
|
||||
) where
|
||||
|
||||
import Data.ByteString (ByteString)
|
||||
import Data.Map (Map)
|
||||
import Data.Text (Text)
|
||||
import PDF.Object (Name)
|
||||
|
||||
type Font = ByteString -> Either String Text
|
||||
type FontSet = Map Name Font
|
||||
|
||||
emptyFont :: Font
|
||||
emptyFont _ = Left "No fond loaded"
|
||||
|
|
@ -3,7 +3,6 @@
|
|||
{-# LANGUAGE FlexibleInstances #-}
|
||||
module PDF.Object (
|
||||
Content(..)
|
||||
, Dictionary
|
||||
, DirectObject(..)
|
||||
, Flow(..)
|
||||
, IndexedObjects
|
||||
|
|
@ -13,11 +12,9 @@ module PDF.Object (
|
|||
, Number(..)
|
||||
, Object(..)
|
||||
, Occurrence(..)
|
||||
, StringObject(..)
|
||||
, Structure(..)
|
||||
, XRefEntry(..)
|
||||
, XRefSection
|
||||
, array
|
||||
, blank
|
||||
, dictionary
|
||||
, directObject
|
||||
|
|
@ -25,20 +22,14 @@ module PDF.Object (
|
|||
, integer
|
||||
, line
|
||||
, magicNumber
|
||||
, name
|
||||
, number
|
||||
, regular
|
||||
, stringObject
|
||||
, structure
|
||||
, toByteString
|
||||
) where
|
||||
|
||||
import Control.Applicative ((<|>), many)
|
||||
import Data.Attoparsec.ByteString.Char8 (choice, count, option, sepBy)
|
||||
import Data.ByteString (ByteString)
|
||||
import qualified Data.ByteString as BS (concat)
|
||||
import qualified Data.ByteString.Char8 as Char8 (cons, pack, singleton, unpack)
|
||||
import Data.ByteString.Char8.Util (B16Int(..), b16ToBytes, unescape)
|
||||
import Control.Applicative ((<|>))
|
||||
import Data.ByteString.Char8 (ByteString)
|
||||
import qualified Data.ByteString.Char8 as BS (
|
||||
concat, cons, pack, singleton, unpack
|
||||
)
|
||||
import Data.Map (Map, (!), mapWithKey)
|
||||
import qualified Data.Map as Map (
|
||||
delete, empty, fromList, lookup, minViewWithKey, toList, union
|
||||
|
|
@ -50,11 +41,15 @@ import PDF.Output (
|
|||
, byteString, getObjectId, getOffset, getOffsets, join, newLine
|
||||
, saveOffset
|
||||
)
|
||||
import PDF.Parser (MonadParser(..), Parser, (<?>), octDigit, oneOf)
|
||||
import PDF.Parser (
|
||||
Parser, (<?>)
|
||||
, char, choice, count, decNumber, hexNumber, many, octDigit, oneOf, option
|
||||
, sepBy, string, takeAll, takeAll1
|
||||
)
|
||||
import Text.Printf (printf)
|
||||
|
||||
line :: MonadParser m => String -> m ()
|
||||
line l = (string (Char8.pack l) *> blank *> return ()) <?> printf "line «%s»" l
|
||||
line :: String -> Parser u ()
|
||||
line l = (string (BS.pack l) *> blank *> return ()) <?> printf "line «%s»" l
|
||||
|
||||
magicNumber :: ByteString
|
||||
magicNumber = "%PDF-"
|
||||
|
|
@ -65,8 +60,8 @@ eofMarker = "%%EOF"
|
|||
whiteSpaceCharset :: String
|
||||
whiteSpaceCharset = "\0\t\12 "
|
||||
|
||||
blank :: MonadParser m => m ()
|
||||
blank = takeAll (`elem` (EOL.charset ++ whiteSpaceCharset)) *> pure ()
|
||||
blank :: Parser u ()
|
||||
blank = takeAll (`elem` (EOL.charset ++ whiteSpaceCharset)) *> return ()
|
||||
|
||||
delimiterCharset :: String
|
||||
delimiterCharset = "()<>[]{}/%"
|
||||
|
|
@ -74,8 +69,8 @@ delimiterCharset = "()<>[]{}/%"
|
|||
regular :: Char -> Bool
|
||||
regular = not . (`elem` (EOL.charset ++ whiteSpaceCharset ++ delimiterCharset))
|
||||
|
||||
integer :: (Read a, Num a, MonadParser m) => m a
|
||||
integer = read . Char8.unpack <$> decNumber <* blank <?> "decimal integer"
|
||||
integer :: (Read a, Num a) => Parser u a
|
||||
integer = read . BS.unpack <$> decNumber <* blank <?> "decimal integer"
|
||||
|
||||
-------------------------------------
|
||||
-- OBJECTS
|
||||
|
|
@ -86,7 +81,7 @@ type IndexedObjects = Map ObjectId Object
|
|||
--
|
||||
-- Boolean
|
||||
--
|
||||
boolean :: MonadParser m => m Bool
|
||||
boolean :: Parser u Bool
|
||||
boolean =
|
||||
(string "true" *> return True) <|> (string "false" *> return False) <?> "boolean"
|
||||
|
||||
|
|
@ -101,42 +96,38 @@ instance Output Number where
|
|||
(n, 0) -> printf "%d" (n :: Int)
|
||||
_ -> printf "%f" f
|
||||
|
||||
number :: MonadParser m => m Number
|
||||
number = Number . read . Char8.unpack <$>
|
||||
(mappend <$> sign <*> (integerPart <|> Char8.cons '0' <$> floatPart))
|
||||
number :: Parser u Number
|
||||
number = Number . read . BS.unpack <$>
|
||||
(mappend <$> sign <*> (integerPart <|> BS.cons '0' <$> floatPart))
|
||||
<?> "number"
|
||||
where
|
||||
sign = string "-" <|> option "" (char '+' >> return "")
|
||||
integerPart = mappend <$> decNumber <*> option "" floatPart
|
||||
floatPart = Char8.cons <$> char '.' <*> (option "0" $ decNumber)
|
||||
floatPart = BS.cons <$> char '.' <*> (option "0" $ decNumber)
|
||||
|
||||
--
|
||||
-- StringObject
|
||||
--
|
||||
data StringObject = Literal ByteString | Hexadecimal B16Int deriving Show
|
||||
data StringObject = Literal String | Hexadecimal String deriving Show
|
||||
|
||||
instance Output StringObject where
|
||||
output (Literal s) = Output.string (printf "(%s)" (Char8.unpack s))
|
||||
output (Hexadecimal (B16Int n)) = Output.string (printf "<%s>" (Char8.unpack n))
|
||||
output (Literal s) = Output.string (printf "(%s)" s)
|
||||
output (Hexadecimal s) = Output.string (printf "<%s>" s)
|
||||
|
||||
stringObject :: MonadParser m => m StringObject
|
||||
stringObject :: Parser u StringObject
|
||||
stringObject =
|
||||
Literal <$> (char '(' *> (BS.concat <$> literalString) <* char ')')
|
||||
<|> Hexadecimal <$> (char '<' *> hexNumber <* char '>')
|
||||
Literal . BS.unpack <$> (char '(' *> (BS.concat <$> literalString) <* char ')')
|
||||
<|> Hexadecimal . BS.unpack <$> (char '<' *> hexNumber <* char '>')
|
||||
<?> "string object (literal or hexadecimal)"
|
||||
where
|
||||
literalString = many literalStringBlock
|
||||
literalStringBlock = takeAll1 normalChar <|> matchingParenthesis <|> escapedChar
|
||||
normalChar = not . (`elem` ("\\()" :: String))
|
||||
matchingParenthesis =
|
||||
mappend <$> (Char8.cons <$> char '(' <*> literalStringBlock) <*> string ")"
|
||||
mappend <$> (BS.cons <$> char '(' <*> literalStringBlock) <*> string ")"
|
||||
escapedChar =
|
||||
Char8.cons <$> char '\\' <*> (Char8.singleton <$> oneOf "nrtbf()\\\n" <|> octalCode)
|
||||
octalCode = choice $ (\n -> Char8.pack <$> count n octDigit) <$> [1..3]
|
||||
|
||||
toByteString :: StringObject -> ByteString
|
||||
toByteString (Hexadecimal h) = b16ToBytes h
|
||||
toByteString (Literal s) = unescape s
|
||||
BS.cons <$> char '\\' <*> (BS.singleton <$> oneOf "nrtbf()\\" <|> octalCode)
|
||||
octalCode = choice $ (\n -> BS.pack <$> count n octDigit) <$> [1..3]
|
||||
|
||||
--
|
||||
-- Name
|
||||
|
|
@ -146,13 +137,13 @@ newtype Name = Name String deriving (Eq, Ord, Show)
|
|||
instance Output Name where
|
||||
output (Name n) = Output.string ('/':n)
|
||||
|
||||
name :: MonadParser m => m Name
|
||||
name = Name . Char8.unpack <$> (char '/' *> takeAll regular) <?> "name"
|
||||
name :: Parser u Name
|
||||
name = Name . BS.unpack <$> (char '/' *> takeAll regular) <?> "name"
|
||||
|
||||
--
|
||||
-- Array
|
||||
--
|
||||
array :: MonadParser m => m [DirectObject]
|
||||
array :: Parser u [DirectObject]
|
||||
array =
|
||||
char '[' *> blank *> directObject `sepBy` blank <* blank <* char ']' <?> "array"
|
||||
|
||||
|
|
@ -169,7 +160,7 @@ instance Output Dictionary where
|
|||
outputKeyVal :: (Name, DirectObject) -> OBuilder
|
||||
outputKeyVal (key, val) = Output.concat [output key, " ", output val]
|
||||
|
||||
dictionary :: MonadParser m => m Dictionary
|
||||
dictionary :: Parser u Dictionary
|
||||
dictionary =
|
||||
string "<<" *> blank *> keyValPairs <* string ">>" <?> "dictionary"
|
||||
where
|
||||
|
|
@ -179,7 +170,7 @@ dictionary =
|
|||
--
|
||||
-- Null
|
||||
--
|
||||
nullObject :: MonadParser m => m ()
|
||||
nullObject :: Parser u ()
|
||||
nullObject = string "null" *> return () <?> "null object"
|
||||
|
||||
--
|
||||
|
|
@ -190,7 +181,7 @@ data IndirectObjCoordinates = IndirectObjCoordinates {
|
|||
, versionNumber :: Int
|
||||
} deriving Show
|
||||
|
||||
reference :: MonadParser m => m IndirectObjCoordinates
|
||||
reference :: Parser u IndirectObjCoordinates
|
||||
reference = IndirectObjCoordinates
|
||||
<$> (fmap ObjectId integer) <*> integer <* char 'R' <?> "reference to an object"
|
||||
|
||||
|
|
@ -219,7 +210,7 @@ instance Output DirectObject where
|
|||
output (Reference (IndirectObjCoordinates {objectId, versionNumber})) =
|
||||
Output.string (printf "%d %d R" (getObjectId objectId) versionNumber)
|
||||
|
||||
directObject :: MonadParser m => m DirectObject
|
||||
directObject :: Parser u DirectObject
|
||||
directObject =
|
||||
Boolean <$> boolean
|
||||
<|> Reference <$> reference {- defined before Number because Number is a prefix of it -}
|
||||
|
|
|
|||
|
|
@ -116,7 +116,7 @@ char :: Char -> OBuilder
|
|||
char c = lift char8 c <* offset (+1)
|
||||
|
||||
string :: String -> OBuilder
|
||||
string s = lift string8 s <* offset (+ length s)
|
||||
string s = lift string8 s <* offset (+ toEnum (length s))
|
||||
|
||||
line :: String -> OBuilder
|
||||
line l = string l `mappend` newLine
|
||||
|
|
|
|||
173
src/PDF/Pages.hs
173
src/PDF/Pages.hs
|
|
@ -1,173 +0,0 @@
|
|||
{-# LANGUAGE NamedFieldPuns #-}
|
||||
module PDF.Pages (
|
||||
Page(..)
|
||||
, get
|
||||
, getAll
|
||||
) where
|
||||
|
||||
import Codec.Compression.Zlib (decompress)
|
||||
import Control.Applicative ((<|>))
|
||||
import Control.Monad (foldM)
|
||||
import Control.Monad.RWS (RWST(..), ask, evalRWST, lift, modify)
|
||||
import qualified Control.Monad.RWS as RWS (get)
|
||||
import Data.ByteString (ByteString)
|
||||
import qualified Data.ByteString.Lazy as Lazy (fromStrict, toStrict)
|
||||
import Data.Map (Map, (!))
|
||||
import qualified Data.Map as Map (empty, fromList, insert, lookup, toList)
|
||||
import Data.Text (Text)
|
||||
import PDF.CMap (cMap)
|
||||
import PDF.Encoding (encoding)
|
||||
import PDF.Font (Font, FontSet)
|
||||
import PDF.Object (
|
||||
Content(..), Dictionary, DirectObject(..), IndirectObjCoordinates(..)
|
||||
, Object(..), Name(..), Structure(..)
|
||||
,)
|
||||
import PDF.Output (ObjectId(..))
|
||||
import PDF.Text (pageContents)
|
||||
import Text.Printf (printf)
|
||||
|
||||
type CachedFonts = Map ObjectId Font
|
||||
type T = RWST Content () CachedFonts (Either String)
|
||||
data Page = Page {
|
||||
contents :: [Text]
|
||||
, source :: ObjectId
|
||||
}
|
||||
|
||||
infixl 1 \\=
|
||||
(\\=) :: T a -> (a -> Either String b) -> T b
|
||||
x \\= f = x >>= lift . f
|
||||
|
||||
infixl 1 //=
|
||||
(//=) :: Either String a -> (a -> T b) -> T b
|
||||
x //= f = lift x >>= f
|
||||
|
||||
expected :: Show a => String -> a -> Either String b
|
||||
expected name = Left . printf "Not a %s: %s" name . show
|
||||
|
||||
stream :: Object -> Either String ByteString
|
||||
stream (Stream {header, streamContent}) = Right $
|
||||
case Map.lookup (Name "Filter") header of
|
||||
Just (NameObject (Name "FlateDecode")) ->
|
||||
Lazy.toStrict . decompress . Lazy.fromStrict $ streamContent
|
||||
_ -> streamContent
|
||||
stream obj = expected "stream" obj
|
||||
|
||||
getResource :: DirectObject -> T Dictionary
|
||||
getResource (Dictionary dictionary) = return dictionary
|
||||
getResource (Reference (IndirectObjCoordinates {objectId})) =
|
||||
getObject objectId \\= dict
|
||||
getResource directObject =
|
||||
lift $ expected "resource (dictionary or reference)" directObject
|
||||
|
||||
getFontDictionary :: Dictionary -> T Dictionary
|
||||
getFontDictionary pageDict =
|
||||
key "Resources" pageDict
|
||||
//= getResource
|
||||
\\= key "Font"
|
||||
>>= getResource
|
||||
|
||||
cache :: (ObjectId -> T Font) -> ObjectId -> T Font
|
||||
cache loader objectId =
|
||||
(maybe load return . Map.lookup objectId) =<< RWS.get
|
||||
where
|
||||
load = do
|
||||
value <- loader objectId
|
||||
modify $ Map.insert objectId value
|
||||
return value
|
||||
|
||||
loadFont :: ObjectId -> T Font
|
||||
loadFont objectId = getObject objectId \\= dict >>= tryMappings
|
||||
where
|
||||
tryMappings dictionary =
|
||||
loadCMap dictionary
|
||||
<|> lift (key "Encoding" dictionary >>= loadEncoding)
|
||||
<|> lift (Left $ unknownFormat (show objectId) (show dictionary))
|
||||
unknownFormat = printf "Unknown font format for object #%s : %s"
|
||||
loadCMap dictionary =
|
||||
key "ToUnicode" dictionary //= follow \\= stream \\= cMap
|
||||
loadEncoding (NameObject (Name name)) = encoding name
|
||||
loadEncoding directObject =
|
||||
Left . printf "Encoding must be a name, not that : %s" $ show directObject
|
||||
|
||||
loadFonts :: Dictionary -> T FontSet
|
||||
loadFonts = foldM addFont Map.empty . Map.toList
|
||||
where
|
||||
addFont :: FontSet -> (Name, DirectObject) -> T FontSet
|
||||
addFont output (name, Reference (IndirectObjCoordinates {objectId})) =
|
||||
flip (Map.insert name) output <$> cache loadFont objectId
|
||||
addFont output _ = return output
|
||||
|
||||
getObject :: ObjectId -> T Object
|
||||
getObject objectId = do
|
||||
content <- ask
|
||||
return (objects content ! objectId)
|
||||
|
||||
key :: String -> Dictionary -> Either String DirectObject
|
||||
key keyName dictionary =
|
||||
maybe (Left errorMessage) Right (Map.lookup (Name keyName) dictionary)
|
||||
where
|
||||
errorMessage =
|
||||
printf "Key %s not found in dictionary %s" keyName (show dictionary)
|
||||
|
||||
target :: DirectObject -> Either String ObjectId
|
||||
target (Reference (IndirectObjCoordinates {objectId})) = Right objectId
|
||||
target directObject = expected "reference" directObject
|
||||
|
||||
many :: DirectObject -> [DirectObject]
|
||||
many (Array l) = l
|
||||
many directObject = [directObject]
|
||||
|
||||
follow :: DirectObject -> T Object
|
||||
follow directObject = target directObject //= getObject
|
||||
|
||||
dict :: Object -> Either String Dictionary
|
||||
dict (Direct (Dictionary dictionary)) = Right dictionary
|
||||
dict obj = expected "dictionary" obj
|
||||
|
||||
dictObject :: String -> Dictionary -> T Dictionary
|
||||
dictObject keyName dictionary = key keyName dictionary //= follow \\= dict
|
||||
|
||||
pagesList :: T [ObjectId]
|
||||
pagesList = do
|
||||
root <- dictObject "Root" . trailer . docStructure =<< ask
|
||||
pages <- dictObject "Pages" root
|
||||
case Map.lookup (Name "Kids") pages of
|
||||
Just (Array kids) -> return $ getReferences kids
|
||||
_ -> return []
|
||||
|
||||
getReferences :: [DirectObject] -> [ObjectId]
|
||||
getReferences objects = do
|
||||
object <- objects
|
||||
case object of
|
||||
Reference (IndirectObjCoordinates {objectId}) -> [objectId]
|
||||
_ -> []
|
||||
|
||||
extractText :: Object -> T [Text]
|
||||
extractText object = do
|
||||
pageDict <- lift $ dict object
|
||||
fonts <- loadFonts =<< getFontDictionary pageDict
|
||||
let objects = ((many <$> (key "Contents" pageDict)) :: Either String [DirectObject])
|
||||
concat <$> (objects //= (mapM $ loadContent fonts))
|
||||
where
|
||||
loadContent :: FontSet -> DirectObject -> T [Text]
|
||||
loadContent fonts directObject =
|
||||
follow directObject \\= stream \\= pageContents fonts
|
||||
|
||||
loadPage :: ObjectId -> T Page
|
||||
loadPage source =
|
||||
(\contents -> Page {contents, source}) <$> (extractText =<< getObject source)
|
||||
|
||||
getAll :: Content -> Either String (Map Int Page)
|
||||
getAll content = fst <$> evalRWST getPages content Map.empty
|
||||
where
|
||||
numbered = Map.fromList . zip [1..]
|
||||
getPages = numbered <$> (mapM loadPage =<< pagesList)
|
||||
|
||||
get :: Content -> Int -> Either String Page
|
||||
get content pageNumber
|
||||
| pageNumber < 1 = Left "Pages start at 1"
|
||||
| otherwise = fst <$> evalRWST getPage content Map.empty
|
||||
where
|
||||
firstPage [] = lift $ Left "Page is out of bounds"
|
||||
firstPage (p:_) = loadPage p
|
||||
getPage = drop (pageNumber - 1) <$> pagesList >>= firstPage
|
||||
|
|
@ -1,72 +1,56 @@
|
|||
{-# LANGUAGE FlexibleInstances #-}
|
||||
{-# LANGUAGE ConstraintKinds #-}
|
||||
{-# LANGUAGE UndecidableInstances #-}
|
||||
module PDF.Parser (
|
||||
MonadParser(..)
|
||||
, Parser
|
||||
Parser
|
||||
, (<?>)
|
||||
, block
|
||||
, char
|
||||
, choice
|
||||
, count
|
||||
, decNumber
|
||||
, hexNumber
|
||||
, many
|
||||
, octDigit
|
||||
, on
|
||||
, oneOf
|
||||
, option
|
||||
, runParser
|
||||
, evalParser
|
||||
, sepBy
|
||||
, string
|
||||
, takeAll
|
||||
, takeAll1
|
||||
) where
|
||||
|
||||
import Control.Applicative (Alternative, (<|>))
|
||||
import Control.Monad (MonadPlus)
|
||||
import Control.Monad.Fail (MonadFail(..))
|
||||
import Control.Applicative ((<|>), empty)
|
||||
import Control.Monad.State (StateT(..), evalStateT)
|
||||
import Control.Monad.Trans (MonadTrans(..))
|
||||
import Control.Monad.Trans (lift)
|
||||
import qualified Data.Attoparsec.ByteString.Char8 as Atto (
|
||||
Parser, char, endOfInput, parseOnly, satisfy, string, take, takeWhile
|
||||
, takeWhile1
|
||||
Parser, char, parseOnly, satisfy, string, take, takeWhile, takeWhile1
|
||||
)
|
||||
import Data.ByteString (ByteString)
|
||||
import Data.ByteString.Char8.Util (B16Int(..))
|
||||
import Data.Char (toLower)
|
||||
import Data.Set (Set)
|
||||
import qualified Data.Set as Set (fromList, member, unions)
|
||||
import Prelude hiding (fail)
|
||||
|
||||
type MonadDeps m = (MonadFail m, MonadPlus m)
|
||||
|
||||
class MonadDeps m => MonadParser m where
|
||||
block :: Int -> m ByteString
|
||||
char :: Char -> m Char
|
||||
decNumber :: m ByteString
|
||||
endOfInput :: m ()
|
||||
hexNumber :: m B16Int
|
||||
oneOf :: String -> m Char
|
||||
string :: ByteString -> m ByteString
|
||||
takeAll :: (Char -> Bool) -> m ByteString
|
||||
takeAll1 :: (Char -> Bool) -> m ByteString
|
||||
|
||||
instance MonadParser Atto.Parser where
|
||||
block = Atto.take
|
||||
char = Atto.char
|
||||
endOfInput = Atto.endOfInput
|
||||
decNumber = Atto.takeWhile1 (`Set.member` digits)
|
||||
hexNumber = B16Int <$> Atto.takeWhile1 (`Set.member` hexDigits)
|
||||
oneOf charSet = Atto.satisfy (`elem` charSet)
|
||||
string s = Atto.string s <?> show s
|
||||
takeAll = Atto.takeWhile
|
||||
takeAll1 = Atto.takeWhile1
|
||||
|
||||
instance (MonadParser m, MonadTrans t, MonadDeps (t m)) => MonadParser (t m) where
|
||||
block = lift . block
|
||||
char = lift . char
|
||||
endOfInput = lift $ endOfInput
|
||||
decNumber = lift $ decNumber
|
||||
hexNumber = lift $ hexNumber
|
||||
oneOf = lift . oneOf
|
||||
string = lift . string
|
||||
takeAll = lift . takeAll
|
||||
takeAll1 = lift . takeAll1
|
||||
|
||||
type Parser s = StateT s Atto.Parser
|
||||
|
||||
(<?>) :: (Alternative m, MonadFail m) => m a -> String -> m a
|
||||
(<?>) :: Parser s a -> String -> Parser s a
|
||||
(<?>) parser debugMessage = parser <|> fail debugMessage
|
||||
|
||||
block :: Int -> Parser s ByteString
|
||||
block = lift . Atto.take
|
||||
|
||||
char :: Char -> Parser s Char
|
||||
char = lift . Atto.char
|
||||
|
||||
choice :: [Parser s a] -> Parser s a
|
||||
choice = foldr (<|>) empty
|
||||
|
||||
count :: Int -> Parser s a -> Parser s [a]
|
||||
count 0 _ = return []
|
||||
count n p = (:) <$> p <*> count (n-1) p
|
||||
|
||||
decNumber :: Parser s ByteString
|
||||
decNumber = lift $ Atto.takeWhile1 (`Set.member` digits)
|
||||
|
||||
digits :: Set Char
|
||||
digits = Set.fromList ['0'..'9']
|
||||
|
||||
|
|
@ -75,7 +59,13 @@ hexDigits = Set.unions [digits, Set.fromList af, Set.fromList $ toLower <$> af]
|
|||
where
|
||||
af = ['A'..'F']
|
||||
|
||||
octDigit :: MonadParser m => m Char
|
||||
hexNumber :: Parser s ByteString
|
||||
hexNumber = lift $ Atto.takeWhile1 (`Set.member` hexDigits)
|
||||
|
||||
many :: Parser s a -> Parser s [a]
|
||||
many parser = (:) <$> parser <*> many parser <|> return []
|
||||
|
||||
octDigit :: Parser s Char
|
||||
octDigit = oneOf ['0'..'7']
|
||||
|
||||
on :: Parser s a -> ByteString -> Parser s (Either String a)
|
||||
|
|
@ -84,8 +74,25 @@ on (StateT parserF) input = StateT $ \state ->
|
|||
Left errorMsg -> return (Left errorMsg, state)
|
||||
Right (result, newState) -> return (Right result, newState)
|
||||
|
||||
runParser :: Parser s a -> s -> ByteString -> Either String (a, s)
|
||||
runParser parser initState = Atto.parseOnly (runStateT parser initState)
|
||||
oneOf :: String -> Parser s Char
|
||||
oneOf charSet = lift $ Atto.satisfy (`elem` charSet)
|
||||
|
||||
evalParser :: Parser s a -> s -> ByteString -> Either String a
|
||||
evalParser parser initState = Atto.parseOnly (evalStateT parser initState)
|
||||
option :: a -> Parser s a -> Parser s a
|
||||
option defaultValue p = p <|> pure defaultValue
|
||||
|
||||
runParser :: Parser s a -> s -> ByteString -> Either String a
|
||||
runParser parser initState =
|
||||
Atto.parseOnly (evalStateT parser initState)
|
||||
|
||||
sepBy :: Parser s a -> Parser s b -> Parser s [a]
|
||||
sepBy parser separator =
|
||||
option [] $ (:) <$> parser <*> many (separator *> parser)
|
||||
|
||||
string :: ByteString -> Parser s ByteString
|
||||
string = lift . Atto.string
|
||||
|
||||
takeAll :: (Char -> Bool) -> Parser s ByteString
|
||||
takeAll = lift . Atto.takeWhile
|
||||
|
||||
takeAll1 :: (Char -> Bool) -> Parser s ByteString
|
||||
takeAll1 = lift . Atto.takeWhile1
|
||||
|
|
|
|||
319
src/PDF/Text.hs
319
src/PDF/Text.hs
|
|
@ -1,319 +0,0 @@
|
|||
{-# LANGUAGE NamedFieldPuns #-}
|
||||
{-# LANGUAGE OverloadedStrings #-}
|
||||
{-# LANGUAGE ConstraintKinds #-}
|
||||
{-# LANGUAGE FlexibleContexts #-}
|
||||
module PDF.Text {-(
|
||||
pageContents
|
||||
)-} where
|
||||
|
||||
import Control.Applicative ((<|>))
|
||||
import Control.Monad (foldM)
|
||||
import Control.Monad.Fail (MonadFail)
|
||||
import Control.Monad.Reader (ReaderT, runReaderT, asks)
|
||||
import Control.Monad.State (MonadState, evalStateT, get, modify, put)
|
||||
import Data.Attoparsec.ByteString.Char8 (choice, sepBy)
|
||||
import Data.ByteString (ByteString)
|
||||
import Data.ByteString.Char8 (pack, unpack)
|
||||
import Data.Char (toLower)
|
||||
import Data.Map ((!), (!?), Map)
|
||||
import qualified Data.Map as Map (fromList)
|
||||
import Data.Text (Text)
|
||||
import PDF.Font (Font, FontSet, emptyFont)
|
||||
import PDF.Object (
|
||||
DirectObject(..), StringObject(..)
|
||||
, array, blank, name, regular, stringObject, toByteString
|
||||
)
|
||||
import PDF.Parser (MonadParser(..), (<?>), Parser, evalParser)
|
||||
|
||||
data StateOperator =
|
||||
C_m | W_ | J | J_ | M | D_ | R_i | I_ | G_s -- general graphic state
|
||||
deriving (Bounded, Enum, Show)
|
||||
data PathOperator =
|
||||
M_ | L_ | C_ | V_ | Y_ | H_ | R_e -- path construction
|
||||
| S | S_ | F_ | F | Fstar | B | Bstar | B_ | B_star | N_ -- path painting
|
||||
| W | Wstar -- clipping path
|
||||
deriving (Bounded, Enum, Show)
|
||||
data ColorOperator =
|
||||
CS | C_s | SC | SCN | S_c | S_cn | G | G_ | RG | R_g | K | K_
|
||||
deriving (Bounded, Enum, Show)
|
||||
data TextOperator =
|
||||
Td | TD | Tm | Tstar -- text positioning
|
||||
| TJ | Tj | Quote | DQuote -- text showing
|
||||
| Tc | Tw | Tz | TL | Tf | Tr | Ts -- text state
|
||||
deriving (Bounded, Enum, Show)
|
||||
data Argument = Raw ByteString | Typed DirectObject deriving Show
|
||||
type Call a = (a, [Argument])
|
||||
|
||||
type Operator a = (Bounded a, Enum a, Show a)
|
||||
|
||||
code :: Operator a => a -> ByteString
|
||||
code = pack . expand . show
|
||||
where
|
||||
expand "" = ""
|
||||
expand (c:'_':s) = toLower c : expand s
|
||||
expand ('s':'t':'a':'r':s) = '*' : expand s
|
||||
expand ('Q':'u':'o':'t':'e':s) = '\'' : expand s
|
||||
expand ('D':'Q':'u':'o':'t':'e':s) = '"' : expand s
|
||||
expand (c:s) = c : expand s
|
||||
|
||||
{-
|
||||
instance Show StateOperator where
|
||||
show Cm = "cm"
|
||||
show W_ = "w"
|
||||
show J = "J"
|
||||
show J_ = "j"
|
||||
show M = "M"
|
||||
show D = "d"
|
||||
show Ri = "ri"
|
||||
show I = "i"
|
||||
show Gs = "gs"
|
||||
|
||||
instance Show PathOperator where
|
||||
show M_ = "m"
|
||||
show L_ = "l"
|
||||
show C_ = "c"
|
||||
show V_ = "v"
|
||||
show Y_ = "y"
|
||||
show H_
|
||||
("m", (M_, \l -> case l of [Raw _, Raw _] -> True ; _ -> False))
|
||||
, ("l", (L_, \l -> case l of [Raw _, Raw _] -> True ; _ -> False))
|
||||
, ("c", (L_, \l -> case l of [Raw _, Raw _, Raw _, Raw _, Raw _, Raw _] -> True ; _ -> False))
|
||||
, ("v", (L_, \l -> case l of [Raw _, Raw _, Raw _, Raw _] -> True ; _ -> False))
|
||||
, ("y", (L_, \l -> case l of [Raw _, Raw _, Raw _, Raw _] -> True ; _ -> False))
|
||||
, ("h", (L_, \l -> case l of [] -> True ; _ -> False))
|
||||
, ("re", (L_, \l -> case l of [Raw _, Raw _, Raw _, Raw _] -> True ; _ -> False))
|
||||
, ("S", (L_, \l -> case l of [] -> True ; _ -> False))
|
||||
, ("s", (L_, \l -> case l of [] -> True ; _ -> False))
|
||||
, ("f", (L_, \l -> case l of [] -> True ; _ -> False))
|
||||
, ("F", (L_, \l -> case l of [] -> True ; _ -> False))
|
||||
, ("F*", (L_, \l -> case l of [] -> True ; _ -> False))
|
||||
, ("B", (L_, \l -> case l of [] -> True ; _ -> False))
|
||||
, ("B*", (L_, \l -> case l of [] -> True ; _ -> False))
|
||||
, ("b", (L_, \l -> case l of [] -> True ; _ -> False))
|
||||
, ("b*", (L_, \l -> case l of [] -> True ; _ -> False))
|
||||
, ("n", (L_, \l -> case l of [] -> True ; _ -> False))
|
||||
, ("W", (L_, \l -> case l of [] -> True ; _ -> False))
|
||||
, ("W*", (L_, \l -> case l of [] -> True ; _ -> False))
|
||||
|
||||
instance Show ColorOperator where
|
||||
|
||||
instance Show TextOperator where
|
||||
show Td = "Td"
|
||||
show TD = "TD"
|
||||
show Tm = "Tm"
|
||||
show Tstar = "T*"
|
||||
show TJ = "TJ"
|
||||
show Tj = "Tj"
|
||||
show Quote = "'"
|
||||
show DQuote = "\""
|
||||
show Tc = "Tc"
|
||||
show Tw = "Tw"
|
||||
show Tz = "Tz"
|
||||
show TL = "TL"
|
||||
show Tf = "Tf"
|
||||
show Tr = "Tr"
|
||||
show Ts = "Ts"
|
||||
-}
|
||||
|
||||
stateOperator :: OperatorTable StateOperator
|
||||
stateOperator = Map.fromList $ (\(op, checker) -> (code op, (op, checker))) <$> [
|
||||
(C_m, \l -> case l of [Raw _, Raw _, Raw _, Raw _, Raw _, Raw _] -> True ; _ -> False)
|
||||
, (W_, \l -> case l of [Raw _] -> True ; _ -> False)
|
||||
, (J, \l -> case l of [Raw _] -> True ; _ -> False)
|
||||
, (J_, \l -> case l of [Raw _] -> True ; _ -> False)
|
||||
, (M, \l -> case l of [Raw _] -> True ; _ -> False)
|
||||
, (D_, \l -> case l of [Raw _, Raw _] -> True ; _ -> False)
|
||||
, (R_i, \l -> case l of [Raw _] -> True ; _ -> False)
|
||||
, (I_, \l -> case l of [Raw _] -> True ; _ -> False)
|
||||
, (G_s, \l -> case l of [Typed (NameObject _)] -> True ; _ -> False)
|
||||
]
|
||||
|
||||
pathOperator :: OperatorTable PathOperator
|
||||
pathOperator = Map.fromList $ (\(op, checker) -> (code op, (op, checker))) <$> [
|
||||
(M_, \l -> case l of [Raw _, Raw _] -> True ; _ -> False)
|
||||
, (L_, \l -> case l of [Raw _, Raw _] -> True ; _ -> False)
|
||||
, (C_, \l -> case l of [Raw _, Raw _, Raw _, Raw _, Raw _, Raw _] -> True ; _ -> False)
|
||||
, (V_, \l -> case l of [Raw _, Raw _, Raw _, Raw _] -> True ; _ -> False)
|
||||
, (Y_, \l -> case l of [Raw _, Raw _, Raw _, Raw _] -> True ; _ -> False)
|
||||
, (H_, \l -> case l of [] -> True ; _ -> False)
|
||||
, (R_e, \l -> case l of [Raw _, Raw _, Raw _, Raw _] -> True ; _ -> False)
|
||||
, (S, \l -> case l of [] -> True ; _ -> False)
|
||||
, (S_, \l -> case l of [] -> True ; _ -> False)
|
||||
, (F_, \l -> case l of [] -> True ; _ -> False)
|
||||
, (F, \l -> case l of [] -> True ; _ -> False)
|
||||
, (Fstar, \l -> case l of [] -> True ; _ -> False)
|
||||
, (B, \l -> case l of [] -> True ; _ -> False)
|
||||
, (Bstar, \l -> case l of [] -> True ; _ -> False)
|
||||
, (B_, \l -> case l of [] -> True ; _ -> False)
|
||||
, (B_star, \l -> case l of [] -> True ; _ -> False)
|
||||
, (N_, \l -> case l of [] -> True ; _ -> False)
|
||||
, (W, \l -> case l of [] -> True ; _ -> False)
|
||||
, (Wstar, \l -> case l of [] -> True ; _ -> False)
|
||||
]
|
||||
|
||||
colorOperator :: OperatorTable ColorOperator
|
||||
colorOperator = Map.fromList $ (\(op, checker) -> (code op, (op, checker))) <$> [
|
||||
(CS, \l -> case l of [Typed (NameObject _)] -> True ; _ -> False)
|
||||
, (C_s, \l -> case l of [Typed (NameObject _)] -> True ; _ -> False)
|
||||
, (SC, \_ -> True)
|
||||
, (SCN, \_ -> True)
|
||||
, (S_c, \_ -> True)
|
||||
, (S_cn, \_ -> True)
|
||||
, (G, \l -> case l of [Raw _] -> True ; _ -> False)
|
||||
, (G_, \l -> case l of [Raw _] -> True ; _ -> False)
|
||||
, (RG, \l -> case l of [Raw _, Raw _, Raw _] -> True ; _ -> False)
|
||||
, (R_g, \l -> case l of [Raw _, Raw _, Raw _] -> True ; _ -> False)
|
||||
, (K, \l -> case l of [Raw _, Raw _, Raw _, Raw _] -> True ; _ -> False)
|
||||
, (K_, \l -> case l of [Raw _, Raw _, Raw _, Raw _] -> True ; _ -> False)
|
||||
]
|
||||
|
||||
{-
|
||||
stateOperator (Cm, [Raw _, Raw _, Raw _, Raw _, Raw _, Raw _]) = True
|
||||
stateOperator (W, [Raw _]) = True
|
||||
stateOperator (J, [Raw _]) = True
|
||||
stateOperator (J_, [Raw _]) = True
|
||||
stateOperator (M, [Raw _]) = True
|
||||
stateOperator (D, [Raw _, Raw _]) = True
|
||||
stateOperator (Ri, [Raw _]) = True
|
||||
stateOperator (I, [Raw _]) = True
|
||||
stateOperator (Gs, [Typed (NameObject _)]) = True
|
||||
stateOperator _ = False
|
||||
-}
|
||||
|
||||
textOperator :: OperatorTable TextOperator
|
||||
textOperator = Map.fromList $ (\(op, checker) -> (code op, (op, checker))) <$> [
|
||||
(Td, \l -> case l of [Raw _, Raw _] -> True ; _ -> False)
|
||||
, (TD, \l -> case l of [Raw _, Raw _] -> True ; _ -> False)
|
||||
, (Tm, \l -> case l of [Raw _, Raw _, Raw _, Raw _, Raw _, Raw _] -> True ; _ -> False)
|
||||
, (Tstar, \l -> case l of [] -> True ; _ -> False)
|
||||
, (TJ, \l -> case l of [Typed (Array _)] -> True ; _ -> False)
|
||||
, (Tj, \l -> case l of [Typed (StringObject _)] -> True ; _ -> False)
|
||||
, (Quote, \l -> case l of [Typed (StringObject _)] -> True ; _ -> False)
|
||||
, (DQuote, \l -> case l of [Typed (StringObject _)] -> True ; _ -> False)
|
||||
, (Tc, \l -> case l of [Raw _] -> True ; _ -> False)
|
||||
, (Tw, \l -> case l of [Raw _] -> True ; _ -> False)
|
||||
, (Tz, \l -> case l of [Raw _] -> True ; _ -> False)
|
||||
, (TL, \l -> case l of [Raw _] -> True ; _ -> False)
|
||||
, (Tf, \l -> case l of [Typed (NameObject _), Raw _] -> True ; _ -> False)
|
||||
, (Tr, \l -> case l of [Raw _] -> True ; _ -> False)
|
||||
, (Ts, \l -> case l of [Raw _] -> True ; _ -> False)
|
||||
]
|
||||
|
||||
{-
|
||||
textOperator (Td, [Raw _, Raw _]) = True
|
||||
textOperator (TD, [Raw _, Raw _]) = True
|
||||
textOperator (Tm, [Raw _, Raw _, Raw _, Raw _, Raw _, Raw _]) = True
|
||||
textOperator (Tstar, []) = True
|
||||
textOperator (TJ, [Typed (Array _)]) = True
|
||||
textOperator (Tj, [Typed (StringObject _)]) = True
|
||||
textOperator (Quote, [Typed (StringObject _)]) = True
|
||||
textOperator (DQuote, [Typed (StringObject _)]) = True
|
||||
textOperator (Tc, [Raw _]) = True
|
||||
textOperator (Tw, [Raw _]) = True
|
||||
textOperator (Tz, [Raw _]) = True
|
||||
textOperator (TL, [Raw _]) = True
|
||||
textOperator (Tf, [Typed (NameObject _), Raw _]) = True
|
||||
textOperator (Tr, [Raw _]) = True
|
||||
textOperator (Ts, [Raw _]) = True
|
||||
textOperator _ = False
|
||||
-}
|
||||
|
||||
type ArgumentStackParser m = (MonadState [Argument] m, MonadParser m)
|
||||
--type Operator a = (Bounded a, Enum a, Show a)
|
||||
type OperatorTable a = Map ByteString (TypeChecker a)
|
||||
type TypeChecker a = (a, [Argument] -> Bool)
|
||||
|
||||
parseShowable :: (Show a, MonadParser m) => a -> m a
|
||||
parseShowable textOp = string (pack $ show textOp) *> return textOp
|
||||
|
||||
callChunk :: MonadParser m => OperatorTable a -> m (Either (TypeChecker a) Argument)
|
||||
callChunk table =
|
||||
(Right <$> choice [stringArg, nameArg, arrayArg])
|
||||
<|> operatorOrRawArg
|
||||
<?> "call chunk"
|
||||
where
|
||||
operatorOrRawArg = do
|
||||
chunk <- takeAll1 regular <* blank
|
||||
case table !? chunk of
|
||||
Nothing -> return . Right $ Raw chunk
|
||||
Just typeChecker -> return $ Left typeChecker
|
||||
|
||||
stackParser :: (ArgumentStackParser m, Operator a) => OperatorTable a -> m (Call a)
|
||||
stackParser table = either popCall push =<< (callChunk table)
|
||||
where
|
||||
push arg = modify (arg:) >> stackParser table
|
||||
popCall (operator, predicate) = do
|
||||
arguments <- reverse <$> get
|
||||
let call = (operator, arguments)
|
||||
if predicate arguments then return call else fail (unpack $ code operator)
|
||||
|
||||
a :: (Operator a, MonadParser m) => OperatorTable a -> m (Call a)
|
||||
a table = evalStateT (stackParser table) []
|
||||
|
||||
argument :: MonadParser m => m Argument
|
||||
argument = Raw <$> takeAll1 regular <* blank
|
||||
|
||||
arrayArg :: MonadParser m => m Argument
|
||||
arrayArg = Typed . Array <$> array <* blank
|
||||
|
||||
nameArg :: MonadParser m => m Argument
|
||||
nameArg = Typed . NameObject <$> name <* blank
|
||||
|
||||
stringArg :: MonadParser m => m Argument
|
||||
stringArg = Typed . StringObject <$> stringObject <* blank
|
||||
|
||||
type ParserWithFont = ReaderT FontSet (Parser Font)
|
||||
|
||||
pageContents :: FontSet -> ByteString -> Either String [Text]
|
||||
pageContents fontSet input =
|
||||
evalParser (runReaderT (page) fontSet) emptyFont input
|
||||
|
||||
several :: MonadParser m => m [a] -> m [a]
|
||||
several p = concat <$> (p `sepBy` blank)
|
||||
|
||||
page :: ParserWithFont [Text]
|
||||
page = several (graphicState <|> text) <* blank <* endOfInput <?> "Text page contents"
|
||||
|
||||
graphicState :: ParserWithFont [Text]
|
||||
graphicState =
|
||||
string "q" *> blank *> insideQ <* blank <* string "Q" <?> "Graphic state"
|
||||
where
|
||||
insideQ = several (command <|> graphicState <|> text)
|
||||
ignore x = a x *> return []
|
||||
command =
|
||||
ignore stateOperator <|> ignore pathOperator <|> ignore colorOperator
|
||||
|
||||
text :: ParserWithFont [Text]
|
||||
text =
|
||||
string "BT" *> blank *> commands <* blank <* string "ET" <?> "Text operators"
|
||||
where
|
||||
commands = several (a textOperator >>= runOperator)
|
||||
|
||||
runOperator :: Call TextOperator -> ParserWithFont [Text]
|
||||
runOperator (Tf, [Typed (NameObject fontName), _]) =
|
||||
asks (! fontName) >>= put >> return []
|
||||
|
||||
runOperator (Tstar, []) = return ["\n"]
|
||||
|
||||
runOperator (TJ, [Typed (Array arrayObject)]) =
|
||||
replicate 1 <$> foldM appendText "" arrayObject
|
||||
where
|
||||
appendText bs (StringObject outputString) =
|
||||
mappend bs <$> decodeString outputString
|
||||
appendText bs _ = return bs
|
||||
|
||||
runOperator (Tj, [Typed (StringObject outputString)]) =
|
||||
replicate 1 <$> decodeString outputString
|
||||
|
||||
runOperator (Quote, [Typed (StringObject outputString)]) =
|
||||
(\bs -> ["\n", bs]) <$> decodeString outputString
|
||||
|
||||
runOperator (DQuote, [Typed (StringObject outputString)]) =
|
||||
(\bs -> ["\n", bs]) <$> decodeString outputString
|
||||
|
||||
runOperator _ = return []
|
||||
|
||||
decodeString :: (MonadFail m, MonadState Font m) => StringObject -> m Text
|
||||
decodeString input = do
|
||||
font <- get
|
||||
either fail return . font $ toByteString input
|
||||
Loading…
Reference in a new issue