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module Frontend where
import Builtins
import Code (Interp(..))
import CodeLens
import Control.Monad (when)
import Control.Monad.Trans.Class (lift)
import Control.Monad.Trans.Except (except, runExceptT)
import Control.Monad.Trans.State.Lazy (evalStateT)
import qualified Data.Map as M
import Env (PrlgEnv)
import qualified IR
import qualified Interpreter as I
import Lens.Family2.State
import Load
( compile
, intern
, loadExpansion
, processInput
, queryExpansion
, shunt
)
import System.Console.Haskeline
-- the signature of this is too ugly to include here
handleError m = do
res <- runExceptT m
case res of
Left err -> do
lift $ outputStrLn err
cmdq .= []
_ -> (pure () :: PrlgEnv ()) --prevents ambiguity
processCmd precompileHook ast' = do
ast <- shunt ast'
code <- lift $ intern ast >>= precompileHook >>= compile
lift (I.prove code) >>= except
interpreterStart :: PrlgEnv ()
interpreterStart = do
addPrelude
interpreterLoop True
interpreterLoop :: Bool -> PrlgEnv ()
interpreterLoop queryMode = do
q <- use cmdq
case q of
[] -> do
minput <-
lift $
getInputLine
(if queryMode
then "prlg? "
else "prlg |- ")
case minput of
Nothing -> return ()
Just "." -> interpreterLoop (not queryMode)
Just input -> do
handleError $ processInput "<user input>" queryMode input
interpreterLoop queryMode
((mode, ast):asts) -> do
cmdq .= asts
handleError $ do
resOK <-
processCmd
(if mode
then queryExpansion
else loadExpansion)
ast
finished <- lift $ cmdq `uses` null
when finished . lift . lift . outputStrLn $
case (resOK, queryMode) of
(True, True) -> "yes."
(False, True) -> "no proof."
(True, False) -> "ok."
(False, False) -> "rejected."
interpreterLoop queryMode
interpreter :: InputT IO ()
interpreter =
evalStateT
interpreterStart
(Interp
{ _defs = M.empty
, _cur = error "no cur"
, _cho = []
, _ops = []
, _opstash = []
, _macrostash = []
, _strtable = IR.emptystrtable
, _cmdq = []
})
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