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module Frontend where
import Builtins
import Code (Interp(..))
import qualified Compiler as C
import Control.Monad.IO.Class (liftIO)
import Control.Monad.Trans.Class (lift)
import Control.Monad.Trans.State.Lazy (evalStateT, gets)
import Data.Foldable (traverse_)
import qualified Data.Map as M
import Env (PrlgEnv, findAtom, withStrTable)
import qualified IR
import qualified Interpreter as I
import qualified Parser as P
import System.Console.Haskeline
import qualified Text.Megaparsec as MP
import qualified Text.Pretty.Simple as Ppr
ppr :: Show a => a -> PrlgEnv ()
ppr x =
liftIO $
Ppr.pPrintOpt
Ppr.CheckColorTty
Ppr.defaultOutputOptionsDarkBg
{ Ppr.outputOptionsCompactParens = True
, Ppr.outputOptionsIndentAmount = 2
, Ppr.outputOptionsPageWidth = 80
}
x
interpret :: String -> PrlgEnv Bool
interpret = (>> return True) . lex
where
lex input = do
case MP.parse P.lexPrlg "-" input of
Left bundle -> lift . outputStr $ MP.errorBundlePretty bundle
Right toks -> parse toks
parse toks = do
case MP.parse P.parsePrlg "-" toks of
Left bundle -> lift . outputStr $ MP.errorBundlePretty bundle
Right asts -> traverse_ shunt asts
shunt ast = do
o <- gets ops
case P.shuntPrlg o ast of
Left err -> lift . outputStrLn $ "expression parsing: " ++ err
Right prlg -> intern prlg
intern prlgs = do
prlgi <- withStrTable $ \st -> IR.internPrlg st prlgs
underscore <- findAtom "_"
list <- findAtom "[]"
prlgv <-
withStrTable $ \st ->
( st
, C.squashVars $
C.variablizePrlg underscore st $ C.desugarPrlg list prlgi)
compile prlgv
compile prlgv = do
comma <- findAtom ","
cut <- findAtom "!"
let code = C.seqGoals $ C.compileGoals comma cut prlgv
execute code
execute code = do
res <- I.prove code
lift . outputStrLn $
case res of
Left err -> err
Right res ->
if res
then "yes."
else "no proof."
interpreterStart :: PrlgEnv ()
interpreterStart = do
addPrelude
interpreterLoop
interpreterLoop :: PrlgEnv ()
interpreterLoop = do
minput <- lift $ getInputLine "prlg? " --TODO switch with plain .
case minput of
Nothing -> return ()
Just input -> do
continue <- interpret input
if continue
then interpreterLoop
else return ()
interpreter :: InputT IO ()
interpreter =
evalStateT
interpreterStart
(Interp
{ defs = M.empty
, ops = []
, strtable = IR.emptystrtable
, cur = error "no cur"
, cho = []
})
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