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{-# OPTIONS_GHC -Wno-missing-export-lists #-}
module Builtins where
import qualified Data.Map as M
import qualified Data.Text as T
import Control.Monad.Except
import Utils
builtinEnv :: EnvMap
builtinEnv = M.fromList [
-- arithmetic
builtinAdd2,
builtinSubtract2,
builtinMultiply2,
builtinDivide2,
-- comparisons
builtinEq2,
builtinLt2,
-- conversions
builtinFmt,
builtinFloor,
builtinToDouble,
-- vector operations
builtinHead,
builtinTail,
builtinPrepend,
-- string operations
builtinSubstr,
-- vector & string operations
builtinConcat,
-- special
builtinPrint,
("unit", makeNonsenseAST ASTUnit),
("_", makeNonsenseAST ASTHole),
("otherwise", makeNonsenseAST ASTHole),
builtinFatal,
-- reserved keywords
reservedKeyword "\\",
reservedKeyword "let!",
reservedKeyword "match",
reservedKeyword "env!"
]
argError1 :: String -> AST -> String
argError1 fn arg1 =
"invalid argument to " ++ fn ++ ": " ++ show arg1
argError2 :: String -> AST -> AST -> String
argError2 fn arg1 arg2 =
"invalid arguments to " ++ fn ++ ": " ++ show arg1 ++ ", " ++ show arg2
argError3 :: String -> AST -> AST -> AST -> String
argError3 fn arg1 arg2 arg3 =
"invalid arguments to " ++ fn ++ ": " ++ show arg1 ++ ", " ++ show arg2 ++ ", " ++ show arg3
reservedKeyword :: String -> (String, AST)
reservedKeyword name = (name, makeNonsenseAST $ ASTFunction True fn1) where
fn1 ast1 = throwL (astPos ast1) $ "unreachable: " ++ name ++ " is a reserved word"
-- BUILTINS
builtinAdd2 :: (String, AST)
builtinAdd2 = (name, makeNonsenseAST $ ASTFunction True fn1) where
name = "+"
fn1 ast1@AST { astNode = ASTInteger a } =
return $ makeNonsenseAST $ ASTFunction True $ fn2 where
fn2 AST { astNode = ASTInteger b } =
return $ makeNonsenseAST $ ASTInteger $ a + b
fn2 ast2 = throwL (astPos ast2) $ argError2 name ast1 ast2
fn1 ast1@AST { astNode = ASTDouble a } =
return $ makeNonsenseAST $ ASTFunction True $ fn2 where
fn2 AST { astNode = ASTDouble b } =
return $ makeNonsenseAST $ ASTDouble $ a + b
fn2 ast2 = throwL (astPos ast2) $ argError2 name ast1 ast2
fn1 ast1 = throwL (astPos ast1) $ argError1 name ast1
builtinSubtract2 :: (String, AST)
builtinSubtract2 = (name, makeNonsenseAST $ ASTFunction True fn1) where
name = "-"
fn1 ast1@AST { astNode = ASTInteger a } =
return $ makeNonsenseAST $ ASTFunction True $ fn2 where
fn2 AST { astNode = ASTInteger b } =
return $ makeNonsenseAST $ ASTInteger $ a - b
fn2 ast2 = throwL (astPos ast2) $ argError2 name ast1 ast2
fn1 ast1@AST { astNode = ASTDouble a } =
return $ makeNonsenseAST $ ASTFunction True $ fn2 where
fn2 AST { astNode = ASTDouble b } =
return $ makeNonsenseAST $ ASTDouble $ a - b
fn2 ast2 = throwL (astPos ast2) $ argError2 name ast1 ast2
fn1 ast1 = throwL (astPos ast1) $ argError1 name ast1
builtinMultiply2 :: (String, AST)
builtinMultiply2 = (name, makeNonsenseAST $ ASTFunction True fn1) where
name = "*"
fn1 ast1@AST { astNode = ASTInteger a } =
return $ makeNonsenseAST $ ASTFunction True $ fn2 where
fn2 AST { astNode = ASTInteger b } =
return $ makeNonsenseAST $ ASTInteger $ a * b
fn2 ast2 = throwL (astPos ast2) $ argError2 name ast1 ast2
fn1 ast1@AST { astNode = ASTDouble a } =
return $ makeNonsenseAST $ ASTFunction True $ fn2 where
fn2 AST { astNode = ASTDouble b } =
return $ makeNonsenseAST $ ASTDouble $ a * b
fn2 ast2 = throwL (astPos ast2) $ argError2 name ast1 ast2
fn1 ast1 = throwL (astPos ast1) $ argError1 name ast1
builtinDivide2 :: (String, AST)
builtinDivide2 = (name, makeNonsenseAST $ ASTFunction True fn1) where
name = "/"
fn1 ast1@AST { astNode = ASTInteger a } =
return $ makeNonsenseAST $ ASTFunction True $ fn2 where
fn2 ast2@AST { astNode = ASTInteger b } =
do when (b == 0) $ throwL (astPos ast2) $ "division by zero"
return $ makeNonsenseAST $ ASTInteger $ a `div` b
fn2 ast2 = throwL (astPos ast2) $ argError2 name ast1 ast2
fn1 ast1@AST { astNode = ASTDouble a } =
return $ makeNonsenseAST $ ASTFunction True $ fn2 where
fn2 ast2@AST { astNode = ASTDouble b } =
do when (b == 0) $ throwL (astPos ast2) $ "division by zero"
return $ makeNonsenseAST $ ASTDouble $ a / b
fn2 ast2 = throwL (astPos ast2) $ argError2 name ast1 ast2
fn1 ast1 = throwL (astPos ast1) $ argError1 name ast1
builtinEq2 :: (String, AST)
builtinEq2 = (name, makeNonsenseAST $ ASTFunction True fn1) where
name = "eq?"
fn1 ast1 =
return $ makeNonsenseAST $ ASTFunction True $ fn2 where
fn2 ast2 = return $ makeNonsenseAST $ ASTBoolean $ ast1 == ast2
builtinLt2 :: (String, AST)
builtinLt2 = (name, makeNonsenseAST $ ASTFunction True fn1) where
name = "lt?"
fn1 ast1 =
return $ makeNonsenseAST $ ASTFunction True $ fn2 where
fn2 ast2 = return $ makeNonsenseAST $ ASTBoolean $ ast1 <= ast2
builtinFloor :: (String, AST)
builtinFloor = (name, makeNonsenseAST $ ASTFunction True fn1) where
name = "floor"
fn1 AST { astNode = ASTDouble dbl } = return $ makeNonsenseAST $ ASTInteger $ floor dbl
fn1 ast1 = throwL (astPos ast1) $ argError1 name ast1
builtinToDouble :: (String, AST)
builtinToDouble = (name, makeNonsenseAST $ ASTFunction True fn1) where
name = "to-double"
fn1 AST { astNode = ASTInteger int } = return $ makeNonsenseAST $ ASTDouble $ fromIntegral int
fn1 ast1 = throwL (astPos ast1) $ argError1 name ast1
builtinFmt :: (String, AST)
builtinFmt = (name, makeNonsenseAST $ ASTFunction True fn1) where
name = "fmt"
fn1 ast1@AST { astNode = ASTString str } =
return $ makeNonsenseAST $ ASTFunction True $ fn2 where
fn2 AST { astNode = ASTVector replacements } =
return $ makeNonsenseAST $ ASTString $
T.unpack $ replaceAll (0 :: Int) replacements (T.pack str)
fn2 ast2 = throwL (astPos ast2) $ argError2 name ast1 ast2
fn1 ast1 = throwL (astPos ast1) $ argError1 name ast1
replaceAll :: Int -> [AST] -> T.Text -> T.Text
replaceAll _ [] text = text
replaceAll n (x:xs) text =
let xRepr = case x of
AST { astNode = ASTString s } -> s
_ -> show x
text' = T.replace (T.pack $ "{" ++ show n ++ "}") (T.pack $ xRepr) text
in replaceAll (n + 1) xs text'
builtinHead :: (String, AST)
builtinHead = (name, makeNonsenseAST $ ASTFunction True fn1) where
name = "head"
fn1 ast1@AST { astNode = ASTVector vec } =
do when (length vec == 0) $ throwL (astPos ast1) $ name ++ " of empty vector"
return $ head vec
fn1 ast1 = throwL (astPos ast1) $ argError1 name ast1
builtinTail :: (String, AST)
builtinTail = (name, makeNonsenseAST $ ASTFunction True fn1) where
name = "tail"
fn1 ast1@AST { astNode = ASTVector vec } =
do when (length vec == 0) $ throwL (astPos ast1) $ name ++ " of empty vector"
return $ makeNonsenseAST $ ASTVector $ tail vec
fn1 ast1 = throwL (astPos ast1) $ argError1 name ast1
builtinSubstr :: (String, AST)
builtinSubstr = (name, makeNonsenseAST $ ASTFunction True fn1) where
name = "substr"
fn1 ast1@AST { astNode = ASTInteger at } =
return $ makeNonsenseAST $ ASTFunction True $ fn2 where
fn2 ast2@AST { astNode = ASTInteger len } =
return $ makeNonsenseAST $ ASTFunction True $ fn3 where
fn3 AST { astNode = ASTString str } =
return $ makeNonsenseAST $ ASTString $ drop at .> take len $ str
fn3 ast3 = throwL (astPos ast3) $ argError3 name ast1 ast2 ast3
fn2 ast2 = throwL (astPos ast2) $ argError2 name ast1 ast2
fn1 ast1 = throwL (astPos ast1) $ argError1 name ast1
builtinPrepend :: (String, AST)
builtinPrepend = (name, makeNonsenseAST $ ASTFunction True fn1) where
name = "prepend"
fn1 ast1 =
return $ makeNonsenseAST $ ASTFunction True $ fn2 where
fn2 AST { astNode = ASTVector vec } =
return $ makeNonsenseAST $ ASTVector $ ast1 : vec
fn2 ast2 = throwL (astPos ast2) $ argError2 name ast1 ast2
builtinPrint :: (String, AST)
builtinPrint = (name, makeNonsenseAST $ ASTFunction False fn1) where
name = "print!"
fn1 AST { astNode = ASTString str } =
do liftIO $ putStr $ str
return $ makeNonsenseAST ASTUnit
fn1 ast1 = throwL (astPos ast1) $ argError1 name ast1
builtinConcat :: (String, AST)
builtinConcat = (name, makeNonsenseAST $ ASTFunction True fn1) where
name = "concat"
fn1 ast1@AST { astNode = ASTString str1 } =
return $ makeNonsenseAST $ ASTFunction True $ fn2 where
fn2 AST { astNode = ASTString str2 } =
return $ makeNonsenseAST $ ASTString $ str1 ++ str2
fn2 ast2 = throwL (astPos ast2) $ argError2 name ast1 ast2
fn1 ast1 = throwL (astPos ast1) $ argError1 name ast1
builtinFatal :: (String, AST)
builtinFatal = (name, makeNonsenseAST $ ASTFunction False fn1) where
name = "fatal!"
fn1 ast1@AST { astNode = ASTString str } =
throwL (astPos ast1) $ str
fn1 ast1 =
throwL (astPos ast1) $ argError1 name ast1
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