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module Load where
import Code (Code, Interp(..))
import qualified Compiler as C
import Control.Monad.Trans.Class (lift)
import Control.Monad.Trans.Except (except)
import Control.Monad.Trans.State.Lazy (gets, modify)
import qualified Data.Map as M
import Env (PrlgEnv, findAtom, findStruct, withStrTable)
import qualified IR
import qualified Parser as P
import qualified Text.Megaparsec as MP
left :: (a -> b) -> Either a c -> Either b c
left f = either (Left . f) Right
tokenize :: String -> String -> Either String [P.Lexeme]
tokenize fn = left MP.errorBundlePretty . MP.parse P.lexPrlg fn
parse :: String -> [P.Lexeme] -> Either String [P.PAST]
parse fn = left MP.errorBundlePretty . MP.parse P.parsePrlg fn
shunt past = do
ops <- lift $ gets ops
except . left (\err -> "operator resolution: " ++ err ++ "\n") $
P.shuntPrlg ops past
intern :: IR.PrlgStr -> PrlgEnv IR.PrlgInt
intern prlgs = do
prlgi <- withStrTable $ \st -> IR.internPrlg st prlgs
underscore <- findAtom "_"
list <- findAtom "[]"
withStrTable $ \st ->
( st
, C.squashVars $ C.variablizePrlg underscore st $ C.desugarPrlg list prlgi)
compile :: IR.PrlgInt -> PrlgEnv Code
compile prlgv = do
comma <- findAtom ","
cut <- findAtom "!"
return $ C.seqGoals (C.compileGoals comma cut prlgv)
expansion ::
(Int -> IR.PrlgInt -> IR.PrlgInt)
-> String
-> String
-> IR.PrlgInt
-> PrlgEnv IR.PrlgInt
expansion noexpand expander output x = do
es <- findStruct expander 2
o <- findAtom output
comma <- findAtom ","
expand <- gets (M.member es . defs)
pure $
if expand
then IR.CallI
comma
[ IR.CallI (IR.str es) [x, IR.VarI (-1) 0]
, IR.CallI o [IR.VarI (-1) 0]
]
else noexpand o x
queryExpansion = expansion (\_ -> id) "query_expansion" "call"
loadExpansion = expansion (\o x -> IR.CallI o [x]) "load_expansion" "assert"
processInput fn queryMode input = do
asts <- except $ tokenize fn input >>= parse fn
lift . modify $ \s -> s {cmdq = [(queryMode, ast) | ast <- asts]}
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