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|
{-# OPTIONS_GHC -Wno-missing-export-lists #-}
module Builtins where
import qualified Data.Map as M
import Control.Monad.Except
import Utils
builtinEnv :: Env
builtinEnv = M.fromList [
("+", builtinAdd2),
("-", builtinSubtract2),
("*", builtinMultiply2),
("/", builtinDivide2),
("head", builtinHead),
("tail", builtinTail),
("prepend", builtinPrepend),
("print!", builtinPrint),
("string-concat", builtinStringConcat2)
]
argError1 :: Show a => String -> a -> String
argError1 fn arg = "invalid argument to " ++ fn ++ ": " ++ show arg
argError2 :: (Show a1, Show a2) => String -> a1 -> a2 -> String
argError2 fn arg1 arg2 = "invalid arguments to " ++ fn ++ ": " ++ show arg1 ++ ", " ++ show arg2
-- BUILTINS
builtinAdd2 :: AST
builtinAdd2 =
let outer _ ast1@(ASTInteger a) = do
let inner _ (ASTInteger b) =
return $ ASTInteger $ a + b
inner _ ast2 = throwL $ argError2 "+" ast1 ast2
return $ ASTFunction $ inner
outer _ ast1@(ASTDouble a) = do
let inner _ (ASTDouble b) =
return $ ASTDouble $ a + b
inner _ ast2 = throwL $ argError2 "+" ast1 ast2
return $ ASTFunction $ inner
outer _ ast1 = throwL $ argError1 "+" ast1
in ASTFunction outer
builtinSubtract2 :: AST
builtinSubtract2 =
let outer _ ast1 = do
(ASTInteger a) <- assertIsASTInteger ast1
let inner _ ast2 = do
(ASTInteger b) <- assertIsASTInteger ast2
return $ ASTInteger $ a - b
return $ ASTFunction $ inner
in ASTFunction outer
builtinMultiply2 :: AST
builtinMultiply2 =
let outer _ ast1 = do
(ASTInteger a) <- assertIsASTInteger ast1
let inner _ ast2 = do
(ASTInteger b) <- assertIsASTInteger ast2
return $ ASTInteger $ a * b
return $ ASTFunction $ inner
in ASTFunction outer
builtinDivide2 :: AST
builtinDivide2 =
let outer _ ast1 = do
(ASTInteger a) <- assertIsASTInteger ast1
let inner _ ast2 = do
(ASTInteger b) <- assertIsASTInteger ast2
when (b == 0) $ throwL $ "division by zero"
return $ ASTInteger $ a `div` b
return $ ASTFunction $ inner
in ASTFunction outer
builtinHead :: AST
builtinHead =
let outer _ ast = do
(ASTVector vec) <- assertIsASTVector ast
when (length vec == 0) $ throwL $ "head of empty vector"
return $ head vec
in ASTFunction outer
builtinTail :: AST
builtinTail =
let outer _ ast = do
(ASTVector vec) <- assertIsASTVector ast
when (length vec == 0) $ throwL $ "tail of empty vector"
return $ ASTVector $ tail vec
in ASTFunction outer
builtinPrepend :: AST
builtinPrepend =
let outer _ ast1 = do
let inner _ ast2 = do
(ASTVector vec) <- assertIsASTVector ast2
return $ ASTVector $ ast1 : vec
return $ ASTFunction $ inner
in ASTFunction outer
builtinPrint :: AST
builtinPrint =
let outer _ ast =
do (ASTString str) <- assertIsASTString ast
liftIO $ putStr $ str
return ASTUnit
in ASTFunction outer
builtinStringConcat2 :: AST
builtinStringConcat2 =
let outer _ ast1 = do
(ASTString str1) <- assertIsASTString ast1
let inner _ ast2 = do
(ASTString str2) <- assertIsASTString ast2
return $ ASTString $ str1 ++ str2
return $ ASTFunction $ inner
in ASTFunction outer
|
