103 lines
3.6 KiB
Haskell
103 lines
3.6 KiB
Haskell
module Main
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( main
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) where
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import Control.Monad (foldM_)
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import Data.Int (Int64)
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import qualified Data.ByteString as ByteString
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import qualified Data.ByteString.Char8 as Char8
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import Data.ByteString (ByteString)
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import qualified Text.Megaparsec as Megaparsec
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import Data.Foldable (find)
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import qualified Data.Text.Lazy.Builder as Text.Builder
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import qualified Data.Text.Lazy.Builder.Int as Text.Builder
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import qualified Data.Text.Lazy as Text.Lazy
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import qualified Data.Text.Lazy.IO as Text.Lazy
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import qualified Data.Text.Encoding as Text
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import GHC.Records (HasField(..))
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-- TODO: kern table since format 1.
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-- For details on subtable format see examples in TrueType reference.
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import Graphics.Fountainhead.Parser
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( fontDirectoryP
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, os2TableP
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, parseTable
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, shortLocaTableP
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)
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import Graphics.Fountainhead.TrueType
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( FontDirectory(..)
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, OffsetSubtable(..)
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, TableDirectory(..)
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)
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import System.Environment (getArgs)
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import System.Exit (exitWith)
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import GHC.IO.Exception (ExitCode(..))
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fontMain :: FilePath -> IO ()
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fontMain fontFile = do
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putStrLn $ "Dumping File:" <> fontFile <> "\n\n"
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ttfContents <- ByteString.readFile fontFile
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let initialState = Megaparsec.State
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{ stateInput = ttfContents
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, stateOffset = 0
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, statePosState = Megaparsec.PosState
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{ pstateInput = ttfContents
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, pstateOffset = 0
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, pstateSourcePos = Megaparsec.initialPos fontFile
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, pstateTabWidth = Megaparsec.defaultTabWidth
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, pstateLinePrefix = ""
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}
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, stateParseErrors = []
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}
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(processedState, Right directory) = Megaparsec.runParser' fontDirectoryP initialState
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Text.Lazy.putStrLn $ Text.Builder.toLazyText $ dumpOffsetTable directory
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{- print directory
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let Just tableDirectory' = find (("OS/2" ==) . tag) $ tableDirectory directory
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tableResult = parseTable tableDirectory' os2TableP processedState
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case tableResult of
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Left e -> putStr (Megaparsec.errorBundlePretty e)
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Right x -> print x -}
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paddedHexadecimal :: Integral a => a -> Text.Builder.Builder
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paddedHexadecimal = ("0x" <>)
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. Text.Builder.fromLazyText
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. Text.Lazy.justifyRight 8 '0'
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. Text.Builder.toLazyText
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. Text.Builder.hexadecimal
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justifyNumber :: Integral a => Int64 -> a -> Text.Builder.Builder
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justifyNumber count = Text.Builder.fromLazyText
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. Text.Lazy.justifyRight count ' '
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. Text.Builder.toLazyText
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. Text.Builder.decimal
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dumpOffsetTable :: FontDirectory -> Text.Builder.Builder
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dumpOffsetTable directory
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= "Offset Table\n------------\n"
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<> " sfnt version: 1.0\n number of tables: "
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<> Text.Builder.decimal (numTables $ offsetSubtable directory)
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<> Text.Builder.singleton '\n'
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<> dumpOffsetSummary (tableDirectory directory)
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where
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dumpOffsetSummary = mconcat . fmap dumpOffsetRow . zip [0..]
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dumpOffsetRow (index, table) = justifyNumber 4 index
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<> ". '"
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<> Text.Builder.fromText (Text.decodeASCII $ tag table)
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<> "' - checksum = "
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<> paddedHexadecimal (getField @"checkSum" table)
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<> ", offset = "
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<> paddedHexadecimal (getField @"offset" table)
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<> ", len = "
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<> justifyNumber 9 (getField @"length" table)
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<> Text.Builder.singleton '\n'
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main :: IO ()
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main = do
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programArguments <- getArgs
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case programArguments of
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[fontFile] -> fontMain fontFile
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_ -> putStrLn "The program expects exactly one argument, the font file path."
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>> exitWith (ExitFailure 2)
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