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{-# LANGUAGE OverloadedStrings #-}
module Text.Pandoc.Readers.LaTeX.Math
( dollarsMath
, inlineEnvironments
, inlineEnvironment
, mathInline
, mathDisplay
, theoremstyle
, theoremEnvironment
, newtheorem
, proof
)
where
import Data.Maybe (fromMaybe)
import Text.Pandoc.Walk (walk)
import Text.Pandoc.Builder as B
import qualified Data.Sequence as Seq
import Text.Pandoc.Readers.LaTeX.Parsing
import Text.Pandoc.Readers.LaTeX.Types
import Text.Pandoc.Class
import Text.Pandoc.Shared (trimMath, stripTrailingNewlines)
import Text.Pandoc.Parsing hiding (blankline, mathDisplay, mathInline,
optional, space, spaces, withRaw, (<|>))
import Control.Applicative ((<|>), optional)
import Control.Monad (guard, mzero)
import qualified Data.Map as M
import Data.Text (Text)
dollarsMath :: PandocMonad m => LP m Inlines
dollarsMath = do
symbol '$'
display <- option False (True <$ symbol '$')
(do contents <- try $ untokenize <$> pDollarsMath 0
if display
then mathDisplay contents <$ symbol '$'
else return $ mathInline contents)
<|> (guard display >> return (mathInline ""))
-- Int is number of embedded groupings
pDollarsMath :: PandocMonad m => Int -> LP m [Tok]
pDollarsMath n = do
tk@(Tok _ toktype t) <- anyTok
case toktype of
Symbol | t == "$"
, n == 0 -> return []
| t == "\\" -> do
tk' <- anyTok
(tk :) . (tk' :) <$> pDollarsMath n
| t == "{" -> (tk :) <$> pDollarsMath (n+1)
| t == "}" ->
if n > 0
then (tk :) <$> pDollarsMath (n-1)
else mzero
_ -> (tk :) <$> pDollarsMath n
mathDisplay :: Text -> Inlines
mathDisplay = displayMath . trimMath
mathInline :: Text -> Inlines
mathInline = math . trimMath
mathEnvWith :: PandocMonad m
=> (Inlines -> a) -> Maybe Text -> Text -> LP m a
mathEnvWith f innerEnv name = f . mathDisplay . inner <$> mathEnv name
where inner x = case innerEnv of
Nothing -> x
Just y -> "\\begin{" <> y <> "}\n" <> x <>
"\\end{" <> y <> "}"
mathEnv :: PandocMonad m => Text -> LP m Text
mathEnv name = do
skipopts
optional blankline
res <- manyTill anyTok (end_ name)
return $ stripTrailingNewlines $ untokenize res
inlineEnvironment :: PandocMonad m => LP m Inlines
inlineEnvironment = try $ do
controlSeq "begin"
name <- untokenize <$> braced
M.findWithDefault mzero name inlineEnvironments
inlineEnvironments :: PandocMonad m => M.Map Text (LP m Inlines)
inlineEnvironments = M.fromList [
("displaymath", mathEnvWith id Nothing "displaymath")
, ("math", math <$> mathEnv "math")
, ("equation", mathEnvWith id Nothing "equation")
, ("equation*", mathEnvWith id Nothing "equation*")
, ("gather", mathEnvWith id (Just "gathered") "gather")
, ("gather*", mathEnvWith id (Just "gathered") "gather*")
, ("multline", mathEnvWith id (Just "gathered") "multline")
, ("multline*", mathEnvWith id (Just "gathered") "multline*")
, ("eqnarray", mathEnvWith id (Just "aligned") "eqnarray")
, ("eqnarray*", mathEnvWith id (Just "aligned") "eqnarray*")
, ("align", mathEnvWith id (Just "aligned") "align")
, ("align*", mathEnvWith id (Just "aligned") "align*")
, ("alignat", mathEnvWith id (Just "aligned") "alignat")
, ("alignat*", mathEnvWith id (Just "aligned") "alignat*")
, ("dmath", mathEnvWith id Nothing "dmath")
, ("dmath*", mathEnvWith id Nothing "dmath*")
, ("dgroup", mathEnvWith id (Just "aligned") "dgroup")
, ("dgroup*", mathEnvWith id (Just "aligned") "dgroup*")
, ("darray", mathEnvWith id (Just "aligned") "darray")
, ("darray*", mathEnvWith id (Just "aligned") "darray*")
]
theoremstyle :: PandocMonad m => LP m Blocks
theoremstyle = do
stylename <- untokenize <$> braced
let mbstyle = case stylename of
"plain" -> Just PlainStyle
"definition" -> Just DefinitionStyle
"remark" -> Just RemarkStyle
_ -> Nothing
case mbstyle of
Nothing -> return ()
Just sty -> updateState $ \s -> s{ sLastTheoremStyle = sty }
return mempty
newtheorem :: PandocMonad m => LP m Inlines -> LP m Blocks
newtheorem inline = do
number <- option True (False <$ symbol '*' <* sp)
name <- untokenize <$> braced
sp
series <- option Nothing $ Just . untokenize <$> bracketedToks
sp
showName <- tokWith inline
sp
syncTo <- option Nothing $ Just . untokenize <$> bracketedToks
sty <- sLastTheoremStyle <$> getState
let spec = TheoremSpec { theoremName = showName
, theoremStyle = sty
, theoremSeries = series
, theoremSyncTo = syncTo
, theoremNumber = number
, theoremLastNum = DottedNum [0] }
tmap <- sTheoremMap <$> getState
updateState $ \s -> s{ sTheoremMap =
M.insert name spec tmap }
return mempty
theoremEnvironment :: PandocMonad m
=> LP m Blocks -> LP m Inlines -> Text -> LP m Blocks
theoremEnvironment blocks opt name = do
tmap <- sTheoremMap <$> getState
case M.lookup name tmap of
Nothing -> mzero
Just tspec -> do
optTitle <- option mempty $ (\x -> space <> "(" <> x <> ")") <$> opt
mblabel <- option Nothing $ Just . untokenize <$>
try (spaces >> controlSeq "label" >> spaces >> braced)
bs <- env name blocks
number <-
if theoremNumber tspec
then do
let name' = fromMaybe name $ theoremSeries tspec
num <- getNextNumber
(maybe (DottedNum [0]) theoremLastNum .
M.lookup name' . sTheoremMap)
updateState $ \s ->
s{ sTheoremMap =
M.adjust
(\spec -> spec{ theoremLastNum = num })
name'
(sTheoremMap s)
}
case mblabel of
Just ident ->
updateState $ \s ->
s{ sLabels = M.insert ident
(B.toList $
theoremName tspec <> "\160" <>
str (renderDottedNum num)) (sLabels s) }
Nothing -> return ()
return $ space <> B.text (renderDottedNum num)
else return mempty
let titleEmph = case theoremStyle tspec of
PlainStyle -> B.strong
DefinitionStyle -> B.strong
RemarkStyle -> B.emph
let title = titleEmph (theoremName tspec <> number)
<> optTitle <> "." <> space
return $ divWith (fromMaybe "" mblabel, [name], []) $ addTitle title
$ case theoremStyle tspec of
PlainStyle -> walk italicize bs
_ -> bs
proof :: PandocMonad m => LP m Blocks -> LP m Inlines -> LP m Blocks
proof blocks opt = do
title <- option (B.text "Proof") opt
bs <- env "proof" blocks
return $
B.divWith ("", ["proof"], []) $
addQed $ addTitle (B.emph (title <> ".")) bs
addTitle :: Inlines -> Blocks -> Blocks
addTitle ils bs =
case B.toList bs of
(Para xs : rest)
-> B.fromList (Para (B.toList ils ++ (Space : xs)) : rest)
_ -> B.para ils <> bs
addQed :: Blocks -> Blocks
addQed bs =
case Seq.viewr (B.unMany bs) of
s Seq.:> Para ils
-> B.Many (s Seq.|> Para (ils ++ B.toList qedSign))
_ -> bs <> B.para qedSign
where
qedSign = B.str "\xa0\x25FB"
italicize :: Block -> Block
italicize x@(Para [Image{}]) = x -- see #6925
italicize (Para ils) = Para [Emph ils]
italicize (Plain ils) = Plain [Emph ils]
italicize x = x
|
