118 lines
2.9 KiB
Haskell
118 lines
2.9 KiB
Haskell
module Frontend where
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import Builtins
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import Code (Interp(..))
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import qualified Compiler as C
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import Control.Monad.IO.Class (liftIO)
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import Control.Monad.Trans.Class (lift)
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import Control.Monad.Trans.Except (except, runExceptT)
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import Control.Monad.Trans.State.Lazy (evalStateT, gets)
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import qualified Data.Map as M
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import Data.Traversable (for)
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import Env (PrlgEnv, findAtom, withStrTable)
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import qualified IR
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import qualified Interpreter as I
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import qualified Parser as P
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import System.Console.Haskeline
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import qualified Text.Megaparsec as MP
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import qualified Text.Pretty.Simple as Ppr
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ppr :: Show a => a -> PrlgEnv ()
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ppr x =
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liftIO $
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Ppr.pPrintOpt
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Ppr.CheckColorTty
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Ppr.defaultOutputOptionsDarkBg
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{ Ppr.outputOptionsCompactParens = True
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, Ppr.outputOptionsIndentAmount = 2
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, Ppr.outputOptionsPageWidth = 80
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}
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x
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left f = either (Left . f) Right
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tokenize = left MP.errorBundlePretty . MP.parse P.lexPrlg "<stdin>"
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parse = left MP.errorBundlePretty . MP.parse P.parsePrlg "<stdin>"
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shunt ops =
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left (\err -> "operator resolution: " ++ err ++ "\n") . P.shuntPrlg ops
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makeAssertion x = IR.CallS "assert" [x]
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intern prlgs = do
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prlgi <- withStrTable $ \st -> IR.internPrlg st prlgs
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underscore <- findAtom "_"
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list <- findAtom "[]"
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withStrTable $ \st ->
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( st
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, C.squashVars $ C.variablizePrlg underscore st $ C.desugarPrlg list prlgi)
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compile prlgv = do
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comma <- findAtom ","
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cut <- findAtom "!"
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return $ C.seqGoals (C.compileGoals comma cut prlgv)
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-- the signature of this is too ugly to include here
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handleError m = do
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res <- runExceptT m
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case res of
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Left err -> lift $ outputStr err
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_ -> pure ()
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processInput astHook good bad input =
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(True <$) . handleError $ do
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asts <- except $ tokenize input >>= parse
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ops <- lift $ gets ops
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for asts $ \ast' -> do
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ast <- except $ astHook <$> shunt ops ast'
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code <- lift $ intern ast >>= compile
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res <- lift (I.prove code) >>= except . left (++ "\n")
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lift . lift . outputStrLn $
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if res
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then good
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else bad
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query = processInput id "yes." "no proof."
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assert = processInput makeAssertion "ok." "rejected."
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interpreterStart :: PrlgEnv ()
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interpreterStart = do
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addPrelude
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interpreterLoop True
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interpreterLoop :: Bool -> PrlgEnv ()
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interpreterLoop queryMode = do
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minput <-
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lift $
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getInputLine
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(if queryMode
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then "prlg? "
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else "prlg |- ")
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case minput of
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Nothing -> return ()
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Just "." -> interpreterLoop (not queryMode)
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Just input -> do
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continue <-
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(if queryMode
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then query
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else assert)
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input
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if continue
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then interpreterLoop queryMode
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else return ()
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interpreter :: InputT IO ()
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interpreter =
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evalStateT
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interpreterStart
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(Interp
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{ defs = M.empty
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, ops = []
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, opstash = []
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, strtable = IR.emptystrtable
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, cur = error "no cur"
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, cho = []
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})
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