Transformer.hs

{-
 Copyright (C) 2012 Kacper Bak <http://gsd.uwaterloo.ca>

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-}
module Language.Clafer.Intermediate.Transformer where

import Control.Lens
import Data.Maybe
import Language.Clafer.Common
import qualified Language.Clafer.Intermediate.Intclafer as I (exp, elements, op)
import Language.Clafer.Intermediate.Intclafer hiding (exp, elements, op)
import Language.Clafer.Intermediate.Desugarer

transModule :: IModule -> IModule
transModule = mDecls . traversed %~ transElement

transElement :: IElement -> IElement
transElement (IEClafer clafer)           = IEClafer $ transClafer clafer
transElement (IEConstraint isHard' pexp) = IEConstraint isHard' $ transPExp False pexp
transElement (IEGoal isMaximize' pexp)   = IEGoal isMaximize' $ transPExp False pexp  

transClafer :: IClafer -> IClafer
transClafer = I.elements . traversed %~ transElement 

transPExp :: Bool -> PExp -> PExp
transPExp True  pexp'@(PExp iType' _ _ _) = desugarPath $ I.exp %~ transIExp (fromJust $ iType') $ pexp'
transPExp False pexp'                     = pexp'

transIExp :: IType -> IExp -> IExp
transIExp iType' idpe@(IDeclPExp _ _ _) = bpexp            %~ transPExp False $ idpe
transIExp iType' ife@(IFunExp op' _)    = exps . traversed %~ transPExp cond  $ ife
  where
    cond = op' == iIfThenElse && 
           iType' `elem` [TBoolean, TClafer []]
transIExp _      iexp' = iexp'