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|
{-# LANGUAGE OverloadedStrings #-}
{- |
Module : Text.Pandoc.Writers.Roff
Copyright : Copyright (C) 2007-2020 John MacFarlane
License : GNU GPL, version 2 or above
Maintainer : John MacFarlane <jgm@berkeley.edu>
Stability : alpha
Portability : portable
Common functions for roff writers (man, ms).
-}
module Text.Pandoc.Writers.Roff (
WriterState(..)
, defaultWriterState
, MS
, Note
, EscapeMode(..)
, escapeString
, withFontFeature
) where
import Data.Char (ord, isAscii)
import Control.Monad.State.Strict
import qualified Data.Map as Map
import Data.Text (Text)
import qualified Data.Text as Text
import Data.String
import Data.Maybe (fromMaybe, isJust, catMaybes)
import Text.Pandoc.Class.PandocMonad (PandocMonad)
import Text.Pandoc.Definition
import Text.DocLayout
import Text.Printf (printf)
import Text.Pandoc.RoffChar (standardEscapes,
characterCodes, combiningAccents)
data WriterState = WriterState { stHasInlineMath :: Bool
, stFirstPara :: Bool
, stNotes :: [Note]
, stSmallCaps :: Bool
, stHighlighting :: Bool
, stInHeader :: Bool
, stFontFeatures :: Map.Map Char Bool
, stHasTables :: Bool
}
defaultWriterState :: WriterState
defaultWriterState = WriterState{ stHasInlineMath = False
, stFirstPara = True
, stNotes = []
, stSmallCaps = False
, stHighlighting = False
, stInHeader = False
, stFontFeatures = Map.fromList [
('I',False)
, ('B',False)
, ('C',False)
]
, stHasTables = False
}
type Note = [Block]
type MS = StateT WriterState
data EscapeMode = AllowUTF8 -- ^ use preferred man escapes
| AsciiOnly -- ^ escape everything
deriving Show
combiningAccentsMap :: Map.Map Char Text
combiningAccentsMap = Map.fromList combiningAccents
essentialEscapes :: Map.Map Char Text
essentialEscapes = Map.fromList standardEscapes
-- | Escape special characters for roff.
escapeString :: EscapeMode -> Text -> Text
escapeString e = Text.concat . escapeString' e . Text.unpack
where
escapeString' _ [] = []
escapeString' escapeMode ('\n':'.':xs) =
"\n\\&." : escapeString' escapeMode xs
escapeString' escapeMode (x:xs) =
case Map.lookup x essentialEscapes of
Just s -> s : escapeString' escapeMode xs
Nothing
| isAscii x -> Text.singleton x : escapeString' escapeMode xs
| otherwise ->
case escapeMode of
AllowUTF8 -> Text.singleton x : escapeString' escapeMode xs
AsciiOnly ->
let accents = catMaybes $ takeWhile isJust
(map (`Map.lookup` combiningAccentsMap) xs)
rest = drop (length accents) xs
s = case Map.lookup x characterCodeMap of
Just t -> "\\[" <> Text.unwords (t:accents) <> "]"
Nothing -> "\\[" <> Text.unwords
(Text.pack (printf "u%04X" (ord x)) : accents) <> "]"
in s : escapeString' escapeMode rest
characterCodeMap :: Map.Map Char Text
characterCodeMap = Map.fromList characterCodes
fontChange :: (HasChars a, IsString a, PandocMonad m) => MS m (Doc a)
fontChange = do
features <- gets stFontFeatures
inHeader <- gets stInHeader
let filling = ['C' | fromMaybe False $ Map.lookup 'C' features] ++
['B' | inHeader ||
fromMaybe False (Map.lookup 'B' features)] ++
['I' | fromMaybe False $ Map.lookup 'I' features]
return $
if null filling
then text "\\f[R]"
else text $ "\\f[" ++ filling ++ "]"
withFontFeature :: (HasChars a, IsString a, PandocMonad m)
=> Char -> MS m (Doc a) -> MS m (Doc a)
withFontFeature c action = do
modify $ \st -> st{ stFontFeatures = Map.adjust not c $ stFontFeatures st }
begin <- fontChange
d <- action
modify $ \st -> st{ stFontFeatures = Map.adjust not c $ stFontFeatures st }
end <- fontChange
return $ begin <> d <> end
|
