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{-# LANGUAGE CPP #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# OPTIONS_GHC -fno-warn-orphans #-}
{-
Copyright © 2017 Albert Krewinkel <tarleb+pandoc@moltkeplatz.de>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-}
{- |
Module : Text.Pandoc.Lua
Copyright : Copyright © 2017 Albert Krewinkel
License : GNU GPL, version 2 or above
Maintainer : Albert Krewinkel <tarleb+pandoc@moltkeplatz.de>
Stability : alpha
Pandoc lua utils.
-}
module Text.Pandoc.Lua (LuaException (..), pushPandocModule, runLuaFilter) where
import Control.Monad (when, (>=>))
import Control.Monad.Identity (Identity)
import Control.Monad.Trans (MonadIO (..))
import Data.IORef (IORef, newIORef, readIORef)
import Foreign.Lua (FromLuaStack (peek), Lua, LuaException (..),
Status (OK), ToLuaStack (push))
import Text.Pandoc.Class (CommonState, PandocIO, getCommonState, getMediaBag,
setMediaBag)
import Text.Pandoc.Definition
import Text.Pandoc.Lua.PandocModule (pushMediaBagModule, pushPandocModule)
import Text.Pandoc.Lua.Filter (LuaFilter, walkMWithLuaFilter)
import Text.Pandoc.MediaBag (MediaBag)
import qualified Foreign.Lua as Lua
runLuaFilter :: Maybe FilePath -> FilePath -> String
-> Pandoc -> PandocIO (Either LuaException Pandoc)
runLuaFilter datadir filterPath format pd = do
commonState <- getCommonState
mediaBag <- getMediaBag
mediaBagRef <- liftIO (newIORef mediaBag)
res <- liftIO . Lua.runLuaEither $
runLuaFilter' commonState datadir filterPath format mediaBagRef pd
newMediaBag <- liftIO (readIORef mediaBagRef)
setMediaBag newMediaBag
return res
runLuaFilter' :: CommonState
-> Maybe FilePath -> FilePath -> String -> IORef MediaBag
-> Pandoc -> Lua Pandoc
runLuaFilter' commonState datadir filterPath format mbRef pd = do
Lua.openlibs
-- store module in global "pandoc"
pushPandocModule datadir
Lua.setglobal "pandoc"
addMediaBagModule
registerFormat
top <- Lua.gettop
stat <- Lua.dofile filterPath
if stat /= OK
then do
luaErrMsg <- peek (-1) <* Lua.pop 1
Lua.throwLuaError luaErrMsg
else do
newtop <- Lua.gettop
-- Use the implicitly defined global filter if nothing was returned
when (newtop - top < 1) pushGlobalFilter
luaFilters <- peek (-1)
runAll luaFilters pd
where
addMediaBagModule = do
Lua.getglobal "pandoc"
push "mediabag"
pushMediaBagModule commonState mbRef
Lua.rawset (-3)
registerFormat = do
push format
Lua.setglobal "FORMAT"
pushGlobalFilter :: Lua ()
pushGlobalFilter = do
Lua.newtable
Lua.getglobal' "pandoc.global_filter"
Lua.call 0 1
Lua.rawseti (-2) 1
runAll :: [LuaFilter] -> Pandoc -> Lua Pandoc
runAll = foldr ((>=>) . walkMWithLuaFilter) return
instance (FromLuaStack a) => FromLuaStack (Identity a) where
peek = fmap return . peek
|
