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{-
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
Running pandoc Lua filters.
-}
module Text.Pandoc.Lua
( LuaException (..)
, runLuaFilter
, runPandocLua
, pushPandocModule
) where
import Control.Monad (when, (>=>))
import Foreign.Lua (FromLuaStack (peek), Lua, LuaException (..),
Status (OK), ToLuaStack (push))
import Text.Pandoc.Class (PandocIO)
import Text.Pandoc.Definition (Pandoc)
import Text.Pandoc.Lua.Filter (LuaFilter, walkMWithLuaFilter)
import Text.Pandoc.Lua.Init (runPandocLua)
import Text.Pandoc.Lua.PandocModule (pushPandocModule) -- TODO: remove
import qualified Foreign.Lua as Lua
-- | Run the Lua filter in @filterPath@ for a transformation to target
-- format @format@. Pandoc uses Lua init files to setup the Lua
-- interpreter.
runLuaFilter :: FilePath -> String
-> Pandoc -> PandocIO (Either LuaException Pandoc)
runLuaFilter filterPath format doc =
runPandocLua (runLuaFilter' filterPath format doc)
runLuaFilter' :: FilePath -> String
-> Pandoc -> Lua Pandoc
runLuaFilter' filterPath format pd = do
-- store module in global "pandoc"
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
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
|
