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|
{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE NoImplicitPrelude #-}
{- |
Module : Text.Pandoc.Lua
Copyright : Copyright © 2017-2019 Albert Krewinkel
License : GNU GPL, version 2 or above
Maintainer : Albert Krewinkel <tarleb+pandoc@moltkeplatz.de>
Stability : alpha
Pandoc's Lua globals.
-}
module Text.Pandoc.Lua.Global
( Global (..)
, setGlobals
) where
import Prelude
import Data.Data (Data)
import Data.Version (Version (versionBranch))
import Foreign.Lua (Lua, Peekable, Pushable)
import Foreign.Lua.Userdata ( ensureUserdataMetatable, pushAnyWithMetatable
, metatableName)
import Paths_pandoc (version)
import Text.Pandoc.Class (CommonState)
import Text.Pandoc.Definition (Pandoc (Pandoc), pandocTypesVersion)
import Text.Pandoc.Lua.Marshaling ()
import Text.Pandoc.Lua.Util (addFunction)
import Text.Pandoc.Options (ReaderOptions)
import qualified Foreign.Lua as Lua
-- | Permissible global Lua variables.
data Global =
FORMAT String
| PANDOC_API_VERSION
| PANDOC_DOCUMENT Pandoc
| PANDOC_READER_OPTIONS ReaderOptions
| PANDOC_SCRIPT_FILE FilePath
| PANDOC_STATE CommonState
| PANDOC_VERSION
-- Cannot derive instance of Data because of CommonState
-- | Set all given globals.
setGlobals :: [Global] -> Lua ()
setGlobals = mapM_ setGlobal
setGlobal :: Global -> Lua ()
setGlobal global = case global of
-- This could be simplified if Global was an instance of Data.
FORMAT format -> do
Lua.push format
Lua.setglobal "FORMAT"
PANDOC_API_VERSION -> do
Lua.push (versionBranch pandocTypesVersion)
Lua.setglobal "PANDOC_API_VERSION"
PANDOC_DOCUMENT doc -> do
Lua.push (LazyPandoc doc)
Lua.setglobal "PANDOC_DOCUMENT"
PANDOC_READER_OPTIONS ropts -> do
Lua.push ropts
Lua.setglobal "PANDOC_READER_OPTIONS"
PANDOC_SCRIPT_FILE filePath -> do
Lua.push filePath
Lua.setglobal "PANDOC_SCRIPT_FILE"
PANDOC_STATE commonState -> do
Lua.push commonState
Lua.setglobal "PANDOC_STATE"
PANDOC_VERSION -> do
Lua.push (versionBranch version)
Lua.setglobal "PANDOC_VERSION"
-- | Readonly and lazy pandoc objects.
newtype LazyPandoc = LazyPandoc Pandoc
deriving (Data)
instance Pushable LazyPandoc where
push lazyDoc = pushAnyWithMetatable pushPandocMetatable lazyDoc
where
pushPandocMetatable = ensureUserdataMetatable (metatableName lazyDoc) $
addFunction "__index" indexLazyPandoc
instance Peekable LazyPandoc where
peek = Lua.peekAny
indexLazyPandoc :: LazyPandoc -> String -> Lua Lua.NumResults
indexLazyPandoc (LazyPandoc (Pandoc meta blks)) field = 1 <$
case field of
"blocks" -> Lua.push blks
"meta" -> Lua.push meta
_ -> Lua.pushnil
|
