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|
{-# LANGUAGE OverloadedStrings #-}
module Text.Pandoc.Readers.LaTeX.Macro
( macroDef
)
where
import Text.Pandoc.Extensions (Extension(..))
import Text.Pandoc.Logging (LogMessage(MacroAlreadyDefined))
import Text.Pandoc.Readers.LaTeX.Parsing
import Text.Pandoc.Readers.LaTeX.Types
import Text.Pandoc.Class
import Text.Pandoc.Shared (safeRead)
import Text.Pandoc.Parsing hiding (blankline, mathDisplay, mathInline,
optional, space, spaces, withRaw, (<|>))
import Control.Applicative ((<|>), optional)
import qualified Data.Map as M
import Data.Text (Text)
macroDef :: (PandocMonad m, Monoid a) => (Text -> a) -> LP m a
macroDef constructor = do
(_, s) <- withRaw (commandDef <|> environmentDef)
(constructor (untokenize s) <$
guardDisabled Ext_latex_macros)
<|> return mempty
where commandDef = do
(name, macro') <- newcommand <|> letmacro <|> defmacro
guardDisabled Ext_latex_macros <|>
updateState (\s -> s{ sMacros = M.insert name macro' (sMacros s) })
environmentDef = do
mbenv <- newenvironment
case mbenv of
Nothing -> return ()
Just (name, macro1, macro2) ->
guardDisabled Ext_latex_macros <|>
do updateState $ \s -> s{ sMacros =
M.insert name macro1 (sMacros s) }
updateState $ \s -> s{ sMacros =
M.insert ("end" <> name) macro2 (sMacros s) }
-- @\newenvironment{envname}[n-args][default]{begin}{end}@
-- is equivalent to
-- @\newcommand{\envname}[n-args][default]{begin}@
-- @\newcommand{\endenvname}@
letmacro :: PandocMonad m => LP m (Text, Macro)
letmacro = do
controlSeq "let"
(name, contents) <- withVerbatimMode $ do
Tok _ (CtrlSeq name) _ <- anyControlSeq
optional $ symbol '='
spaces
-- we first parse in verbatim mode, and then expand macros,
-- because we don't want \let\foo\bar to turn into
-- \let\foo hello if we have previously \def\bar{hello}
contents <- bracedOrToken
return (name, contents)
contents' <- doMacros' 0 contents
return (name, Macro ExpandWhenDefined [] Nothing contents')
defmacro :: PandocMonad m => LP m (Text, Macro)
defmacro = try $
-- we use withVerbatimMode, because macros are to be expanded
-- at point of use, not point of definition
withVerbatimMode $ do
controlSeq "def"
Tok _ (CtrlSeq name) _ <- anyControlSeq
argspecs <- many (argspecArg <|> argspecPattern)
contents <- bracedOrToken
return (name, Macro ExpandWhenUsed argspecs Nothing contents)
argspecArg :: PandocMonad m => LP m ArgSpec
argspecArg = do
Tok _ (Arg i) _ <- satisfyTok isArgTok
return $ ArgNum i
argspecPattern :: PandocMonad m => LP m ArgSpec
argspecPattern =
Pattern <$> many1 (satisfyTok (\(Tok _ toktype' txt) ->
(toktype' == Symbol || toktype' == Word) &&
(txt /= "{" && txt /= "\\" && txt /= "}")))
newcommand :: PandocMonad m => LP m (Text, Macro)
newcommand = do
pos <- getPosition
Tok _ (CtrlSeq mtype) _ <- controlSeq "newcommand" <|>
controlSeq "renewcommand" <|>
controlSeq "providecommand" <|>
controlSeq "DeclareMathOperator" <|>
controlSeq "DeclareRobustCommand"
withVerbatimMode $ do
Tok _ (CtrlSeq name) txt <- do
optional (symbol '*')
anyControlSeq <|>
(symbol '{' *> spaces *> anyControlSeq <* spaces <* symbol '}')
spaces
numargs <- option 0 $ try bracketedNum
let argspecs = map ArgNum [1..numargs]
spaces
optarg <- option Nothing $ Just <$> try bracketedToks
spaces
contents' <- bracedOrToken
let contents =
case mtype of
"DeclareMathOperator" ->
Tok pos (CtrlSeq "mathop") "\\mathop"
: Tok pos Symbol "{"
: Tok pos (CtrlSeq "mathrm") "\\mathrm"
: Tok pos Symbol "{"
: (contents' ++
[ Tok pos Symbol "}", Tok pos Symbol "}" ])
_ -> contents'
macros <- sMacros <$> getState
case M.lookup name macros of
Just macro
| mtype == "newcommand" -> do
report $ MacroAlreadyDefined txt pos
return (name, macro)
| mtype == "providecommand" -> return (name, macro)
_ -> return (name, Macro ExpandWhenUsed argspecs optarg contents)
newenvironment :: PandocMonad m => LP m (Maybe (Text, Macro, Macro))
newenvironment = do
pos <- getPosition
Tok _ (CtrlSeq mtype) _ <- controlSeq "newenvironment" <|>
controlSeq "renewenvironment" <|>
controlSeq "provideenvironment"
withVerbatimMode $ do
optional $ symbol '*'
spaces
name <- untokenize <$> braced
spaces
numargs <- option 0 $ try bracketedNum
spaces
optarg <- option Nothing $ Just <$> try bracketedToks
let argspecs = map (\i -> ArgNum i) [1..numargs]
startcontents <- spaces >> bracedOrToken
endcontents <- spaces >> bracedOrToken
macros <- sMacros <$> getState
case M.lookup name macros of
Just _
| mtype == "newenvironment" -> do
report $ MacroAlreadyDefined name pos
return Nothing
| mtype == "provideenvironment" ->
return Nothing
_ -> return $ Just (name,
Macro ExpandWhenUsed argspecs optarg startcontents,
Macro ExpandWhenUsed [] Nothing endcontents)
bracketedNum :: PandocMonad m => LP m Int
bracketedNum = do
ds <- untokenize <$> bracketedToks
case safeRead ds of
Just i -> return i
_ -> return 0
|
