content: {-# LANGUAGE OverloadedStrings #-}
  {- |
     Module      : Text.Pandoc.Readers.Native
     Copyright   : Copyright (C) 2011-2024 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 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.PandocMonad (PandocMonad)
  import Text.Pandoc.Error
  import Text.Pandoc.Sources (ToSources(..), sourcesToText)
  
  -- | 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, ToSources a)
             => ReaderOptions
             -> a
             -> m Pandoc
  readNative _ s =
    let t = sourcesToText . toSources $ s
    in  case maybe (Pandoc nullMeta <$> readBlocks t) Right (safeRead t) 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)
  