-----------------------------------------------------------------------------
-- |
-- Module      :  Writer.Formats.Utf8
-- License     :  MIT (see the LICENSE file)
-- Maintainer  :  Felix Klein (klein@react.uni-saarland.de)
-- 
-- Transforms a specification to a UTF8 string.
-- 
-----------------------------------------------------------------------------

module Writer.Formats.Psl where

-----------------------------------------------------------------------------

import Config
import Simplify

import Data.Error
import Data.Specification

import Writer.Eval
import Writer.Data
import Writer.Utils

-----------------------------------------------------------------------------

-- | PSL operator configuration.

opConfig
  :: OperatorConfig

opConfig = OperatorConfig
  { tTrue      = "true"
  , fFalse     = "false"
  , opNot      = UnaryOp  "!"           1
  , opAnd      = BinaryOp "&&"          2 AssocLeft
  , opOr       = BinaryOp "||"          3 AssocLeft
  , opImplies  = BinaryOp "->"          6 AssocRight
  , opEquiv    = BinaryOp "<->"         6 AssocRight
  , opNext     = UnaryOp  "next!"       4 
  , opFinally  = UnaryOp  "eventually!" 4 
  , opGlobally = UnaryOp  "always"      7      
  , opUntil    = BinaryOp "until!"      5 AssocRight
  , opRelease  = BinaryOpUnsupported
  , opWeak     = BinaryOpUnsupported
  }

-----------------------------------------------------------------------------

-- | PSL format writer.

writeFormat
  :: Configuration -> Specification -> Either Error String

writeFormat c s = do
  (es,ss,rs,as,is,gs) <- eval c s
  fml0 <- merge es ss rs as is gs
  fml1 <- simplify (adjust c opConfig) fml0
  
  return $ printFormula opConfig (outputMode c) fml1

-----------------------------------------------------------------------------