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{-
Copyright © 2017-2018 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
-}
{-# LANGUAGE NoImplicitPrelude #-}
{- |
Module : Text.Pandoc.Lua
Copyright : Copyright © 2017-2018 Albert Krewinkel
License : GNU GPL, version 2 or above
Maintainer : Albert Krewinkel <tarleb+pandoc@moltkeplatz.de>
Stability : alpha
Functions to initialize the Lua interpreter.
-}
module Text.Pandoc.Lua.Init
( LuaException (..)
, LuaPackageParams (..)
, runLua
, luaPackageParams
) where
import Prelude
import Control.Monad.Trans (MonadIO (..))
import Data.Data (Data, dataTypeConstrs, dataTypeOf, showConstr)
import Data.IORef (newIORef, readIORef)
import Foreign.Lua (Lua)
import GHC.IO.Encoding (getForeignEncoding, setForeignEncoding, utf8)
import Text.Pandoc.Class (PandocIO, getCommonState, getUserDataDir,
getMediaBag, setMediaBag)
import Text.Pandoc.Lua.Global (Global (..), setGlobals)
import Text.Pandoc.Lua.Packages (LuaPackageParams (..),
installPandocPackageSearcher)
import Text.Pandoc.Lua.Util (loadScriptFromDataDir)
import qualified Foreign.Lua as Lua
import qualified Foreign.Lua.Module.Text as Lua
import qualified Text.Pandoc.Definition as Pandoc
-- | Lua error message
newtype LuaException = LuaException String deriving (Show)
-- | Run the lua interpreter, using pandoc's default way of environment
-- initialization.
runLua :: Lua a -> PandocIO (Either LuaException a)
runLua luaOp = do
luaPkgParams <- luaPackageParams
globals <- defaultGlobals
enc <- liftIO $ getForeignEncoding <* setForeignEncoding utf8
res <- liftIO . Lua.runEither $ do
setGlobals globals
initLuaState luaPkgParams
luaOp
liftIO $ setForeignEncoding enc
newMediaBag <- liftIO (readIORef (luaPkgMediaBag luaPkgParams))
setMediaBag newMediaBag
return $ case res of
Left (Lua.Exception msg) -> Left (LuaException msg)
Right x -> Right x
-- | Global variables which should always be set.
defaultGlobals :: PandocIO [Global]
defaultGlobals = do
commonState <- getCommonState
return
[ PANDOC_API_VERSION
, PANDOC_STATE commonState
, PANDOC_VERSION
]
-- | Generate parameters required to setup pandoc's lua environment.
luaPackageParams :: PandocIO LuaPackageParams
luaPackageParams = do
commonState <- getCommonState
datadir <- getUserDataDir
mbRef <- liftIO . newIORef =<< getMediaBag
return LuaPackageParams
{ luaPkgCommonState = commonState
, luaPkgDataDir = datadir
, luaPkgMediaBag = mbRef
}
-- | Initialize the lua state with all required values
initLuaState :: LuaPackageParams -> Lua ()
initLuaState luaPkgParams = do
Lua.openlibs
Lua.preloadTextModule "text"
installPandocPackageSearcher luaPkgParams
loadScriptFromDataDir (luaPkgDataDir luaPkgParams) "init.lua"
putConstructorsInRegistry
putConstructorsInRegistry :: Lua ()
putConstructorsInRegistry = do
Lua.getglobal "pandoc"
constrsToReg $ Pandoc.Pandoc mempty mempty
constrsToReg $ Pandoc.Str mempty
constrsToReg $ Pandoc.Para mempty
constrsToReg $ Pandoc.Meta mempty
constrsToReg $ Pandoc.MetaList mempty
constrsToReg $ Pandoc.Citation mempty mempty mempty Pandoc.AuthorInText 0 0
putInReg "Attr" -- used for Attr type alias
putInReg "ListAttributes" -- used for ListAttributes type alias
Lua.pop 1
where
constrsToReg :: Data a => a -> Lua ()
constrsToReg = mapM_ (putInReg . showConstr) . dataTypeConstrs . dataTypeOf
putInReg :: String -> Lua ()
putInReg name = do
Lua.push ("pandoc." ++ name) -- name in registry
Lua.push name -- in pandoc module
Lua.rawget (Lua.nthFromTop 3)
Lua.rawset Lua.registryindex
|
