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{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE OverloadedStrings #-}
{- |
Module : Text.Pandoc.Readers.Native
Copyright : Copyright (C) 2011-2019 John MacFarlane
License : GNU GPL, version 2 or above
Maintainer : John MacFarlane <jgm@berkeley.edu>
Stability : alpha
Portability : portable
Conversion of a string representation of a pandoc type (@Pandoc@,
@[Block]@, @Block@, @[Inline]@, or @Inline@) to a @Pandoc@ document.
-}
module Text.Pandoc.Readers.Native ( readNative ) where
import Prelude
import Text.Pandoc.Definition
import Text.Pandoc.Options (ReaderOptions)
import Text.Pandoc.Shared (safeRead)
import Control.Monad.Except (throwError)
import Data.Text (Text)
import Text.Pandoc.Class
import Text.Pandoc.Error
-- | Read native formatted text and return a Pandoc document.
-- The input may be a full pandoc document, a block list, a block,
-- an inline list, or an inline. Thus, for example,
--
-- > Str "hi"
--
-- will be treated as if it were
--
-- > Pandoc nullMeta [Plain [Str "hi"]]
--
readNative :: PandocMonad m
=> ReaderOptions
-> Text -- ^ String to parse (assuming @'\n'@ line endings)
-> m Pandoc
readNative _ s =
case maybe (Pandoc nullMeta <$> readBlocks s) Right (safeRead s) of
Right doc -> return doc
Left _ -> throwError $ PandocParseError "couldn't read native"
readBlocks :: Text -> Either PandocError [Block]
readBlocks s = maybe ((:[]) <$> readBlock s) Right (safeRead s)
readBlock :: Text -> Either PandocError Block
readBlock s = maybe (Plain <$> readInlines s) Right (safeRead s)
readInlines :: Text -> Either PandocError [Inline]
readInlines s = maybe ((:[]) <$> readInline s) Right (safeRead s)
readInline :: Text -> Either PandocError Inline
readInline s = maybe (Left . PandocParseError $ "Could not read: " <> s) Right (safeRead s)
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