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{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TypeApplications #-}
{- |
Module : Text.Pandoc.Readers.Custom
Copyright : Copyright (C) 2021 John MacFarlane
License : GNU GPL, version 2 or above
Maintainer : John MacFarlane <jgm@berkeley.edu>
Stability : alpha
Portability : portable
Supports custom parsers written in Lua which produce a Pandoc AST.
-}
module Text.Pandoc.Readers.Custom ( readCustom ) where
import Control.Exception
import Control.Monad (when)
import HsLua as Lua hiding (Operation (Div), render)
import HsLua.Class.Peekable (PeekError)
import Control.Monad.IO.Class (MonadIO)
import Text.Pandoc.Definition
import Text.Pandoc.Lua (Global (..), runLua, setGlobals)
import Text.Pandoc.Lua.Util (dofileWithTraceback)
import Text.Pandoc.Options
import Text.Pandoc.Class (PandocMonad)
import Text.Pandoc.Sources (Sources, ToSources(..))
-- | Convert custom markup to Pandoc.
readCustom :: (PandocMonad m, MonadIO m, ToSources s)
=> FilePath -> ReaderOptions -> s -> m Pandoc
readCustom luaFile opts srcs = do
let input = toSources srcs
let globals = [ PANDOC_SCRIPT_FILE luaFile ]
res <- runLua $ do
setGlobals globals
stat <- dofileWithTraceback luaFile
-- check for error in lua script (later we'll change the return type
-- to handle this more gracefully):
when (stat /= Lua.OK)
Lua.throwErrorAsException
parseCustom input opts
case res of
Left msg -> throw msg
Right doc -> return doc
parseCustom :: forall e. PeekError e
=> Sources
-> ReaderOptions
-> LuaE e Pandoc
parseCustom = invoke @e "Reader"
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