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{-# LANGUAGE GADTs #-}
{-# LANGUAGE TypeOperators #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE UndecidableInstances #-}
{-# LANGUAGE MultiParamTypeClasses #-}

module Feldspar.Compiler.Imperative.FromCore.Error where



import Control.Monad.RWS

import Language.Syntactic

import Feldspar.Core.Types (Type)
import Feldspar.Core.Interpretation
import Feldspar.Core.Constructs.Error

import Feldspar.Compiler.Imperative.Frontend hiding (Type)
import Feldspar.Compiler.Imperative.FromCore.Interpretation



instance (Compile dom dom) => Compile (Error :|| Type) dom
  where
    compileProgSym (C' Undefined)    _ _   Nil = return ()
    compileProgSym (C' (Assert msg)) _ loc (cond :* a :* Nil) = do
        compileAssert cond msg
        compileProg loc a

    compileExprSym (C' (Assert msg)) _ (cond :* a :* Nil) = do
        compileAssert cond msg
        compileExpr a
    compileExprSym a info args = compileProgFresh a info args

compileAssert :: (Compile dom dom)
              => ASTF (Decor Info dom) a -> String -> CodeWriter ()
compileAssert cond msg = do
    condExpr <- compileExpr cond
    tellProg [Call "assert" [In condExpr]]
    when (length msg > 0) $ tellProg [Comment $ "{" ++ msg ++ "}"]