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