106 lines
3.6 KiB
Haskell
106 lines
3.6 KiB
Haskell
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{- This Source Code Form is subject to the terms of the Mozilla Public License,
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v. 2.0. If a copy of the MPL was not distributed with this file, You can
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obtain one at https://mozilla.org/MPL/2.0/. -}
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{-# LANGUAGE DataKinds #-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE TypeApplications #-}
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{-# LANGUAGE RecordWildCards #-}
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-- | Outputs information about a font as text.
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module Graphics.Fountainhead.Dumper
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( ParseErrorOrDump
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, dumpCmap
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, dumpTrueType
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, dumpOffsetTable
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) where
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import Data.ByteString (ByteString)
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import Data.Int (Int64)
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import qualified Data.Text.Encoding as Text
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import qualified Data.Text.Lazy as Text.Lazy
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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 Data.Void
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import GHC.Records (HasField(..))
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import Graphics.Fountainhead.TrueType
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( CmapTable(..)
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, FontDirectory(..)
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, OffsetSubtable(..)
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, TableDirectory(..)
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)
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import qualified Text.Megaparsec as Megaparsec
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import Graphics.Fountainhead.Parser
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( parseTable
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, cmapTableP
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)
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type ParseErrorOrDump
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= Either (Megaparsec.ParseErrorBundle ByteString Void) Text.Builder.Builder
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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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newlineBuilder :: Text.Builder.Builder
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newlineBuilder = Text.Builder.singleton '\n'
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dumpHead :: String -> Text.Builder.Builder
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dumpHead headline = Text.Builder.fromString headline
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<> newlineBuilder
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<> Text.Builder.fromLazyText (Text.Lazy.replicate headlineLength "-")
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<> newlineBuilder
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where
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headlineLength = fromIntegral $ Prelude.length headline
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dumpOffsetTable :: FontDirectory -> Text.Builder.Builder
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dumpOffsetTable directory
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= dumpHead "Offset Table"
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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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<> newlineBuilder
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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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<> newlineBuilder
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dumpCmap :: CmapTable -> Text.Builder.Builder
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dumpCmap = const $ dumpHead "'cmap' Table - Character to Glyph Index Mapping Table"
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dumpTrueType
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:: Megaparsec.State ByteString Void
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-> FontDirectory
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-> ParseErrorOrDump
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dumpTrueType processedState directory@FontDirectory{..}
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= foldr go (Right $ dumpOffsetTable directory) tableDirectory
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where
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go :: TableDirectory -> ParseErrorOrDump -> ParseErrorOrDump
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go tableEntry (Left accumulator) = Left accumulator
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go tableEntry (Right accumulator)
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= maybe (Right accumulator) (concatDump accumulator)
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$ dumpSubTable tableEntry
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concatDump accumulator builderDump = ((accumulator <> newlineBuilder) <>)
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<$> builderDump
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dumpSubTable tableEntry =
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case getField @"tag" tableEntry of
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"cmap" -> Just $ dumpCmap <$> parseTable tableEntry cmapTableP processedState
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_ -> Nothing
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