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{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE DeriveGeneric #-}
module Thermoprint.Printout.BBCode
( bbcode
, TreeError(..)
) where
import Data.Text (Text)
import qualified Data.Text as T ()
import GHC.Generics (Generic)
import Control.Exception (Exception)
import Data.Typeable (Typeable)
import Data.Bifunctor (bimap, first)
import Control.Monad (join)
import Text.BBCode (DomTree(..), TreeError(..))
import qualified Text.BBCode as Raw (bbcode, BBCodeError(..))
import Thermoprint.Printout
-- ^ We replicate 'Raw.BBCodeError' but add a new failure mode documenting incompatibly of the parsed syntax tree with our document format
data BBCodeError = LexerError String -- ^ Error while parsing input to stream of tokens
| TreeError TreeError -- ^ Error while parsing stream of tokens to syntax tree
| SemanticError SemanticError -- ^ Error while mapping syntax tree to document format
deriving (Show, Eq, Generic, Typeable)
instance Exception BBCodeError
data SemanticError = Placeholder
deriving (Show, Eq, Generic, Typeable)
instance Exception SemanticError
bbcode :: Text -> Either BBCodeError Printout
bbcode = join . fmap (first SemanticError) . bimap morph' morph . Raw.bbcode
morph' :: Raw.BBCodeError -> BBCodeError
morph' (Raw.LexerError x) = LexerError x
morph' (Raw.TreeError x) = TreeError x
morph :: [DomTree] -> Either SemanticError Printout
morph = undefined
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