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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 :: Env
builtinEnv = M.fromList [
-- arithmetic
builtinAdd2,
builtinSubtract2,
builtinMultiply2,
builtinDivide2,
-- conversions
builtinFmt,
builtinFloor,
builtinToDouble,
-- vector operations
builtinHead,
builtinTail,
builtinPrepend,
-- string operations
builtinSubstr,
-- vector & string operations
builtinConcat,
-- special
builtinPrint,
("unit", ASTUnit),
("_", ASTHole),
("otherwise", ASTHole),
builtinFatal
]
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
argError3 :: (Show a1, Show a2, Show a3) => String -> a1 -> a2 -> a3 -> String
argError3 fn arg1 arg2 arg3 = "invalid arguments to " ++ fn ++ ": " ++ show arg1 ++ ", " ++ show arg2 ++ ", " ++ show arg3
-- BUILTINS
builtinAdd2 :: (String, AST)
builtinAdd2 = (name, ASTFunction fn1) where
name = "+"
fn1 _ ast1@(ASTInteger a) =
return $ ASTFunction $ fn2 where
fn2 _ (ASTInteger b) =
return $ ASTInteger $ a + b
fn2 _ ast2 = throwL $ argError2 name ast1 ast2
fn1 _ ast1@(ASTDouble a) =
return $ ASTFunction $ fn2 where
fn2 _ (ASTDouble b) =
return $ ASTDouble $ a + b
fn2 _ ast2 = throwL $ argError2 name ast1 ast2
fn1 _ ast1 = throwL $ argError1 name ast1
builtinSubtract2 :: (String, AST)
builtinSubtract2 = (name, ASTFunction fn1) where
name = "-"
fn1 _ ast1@(ASTInteger a) =
return $ ASTFunction $ fn2 where
fn2 _ (ASTInteger b) =
return $ ASTInteger $ a - b
fn2 _ ast2 = throwL $ argError2 name ast1 ast2
fn1 _ ast1@(ASTDouble a) =
return $ ASTFunction $ fn2 where
fn2 _ (ASTDouble b) =
return $ ASTDouble $ a - b
fn2 _ ast2 = throwL $ argError2 name ast1 ast2
fn1 _ ast1 = throwL $ argError1 name ast1
builtinMultiply2 :: (String, AST)
builtinMultiply2 = (name, ASTFunction fn1) where
name = "*"
fn1 _ ast1@(ASTInteger a) =
return $ ASTFunction $ fn2 where
fn2 _ (ASTInteger b) =
return $ ASTInteger $ a * b
fn2 _ ast2 = throwL $ argError2 name ast1 ast2
fn1 _ ast1@(ASTDouble a) =
return $ ASTFunction $ fn2 where
fn2 _ (ASTDouble b) =
return $ ASTDouble $ a * b
fn2 _ ast2 = throwL $ argError2 name ast1 ast2
fn1 _ ast1 = throwL $ argError1 name ast1
builtinDivide2 :: (String, AST)
builtinDivide2 = (name, ASTFunction fn1) where
name = "/"
fn1 _ ast1@(ASTInteger a) =
return $ ASTFunction $ fn2 where
fn2 _ (ASTInteger b) =
do when (b == 0) $ throwL $ "division by zero"
return $ ASTInteger $ a `div` b
fn2 _ ast2 = throwL $ argError2 name ast1 ast2
fn1 _ ast1@(ASTDouble a) =
return $ ASTFunction $ fn2 where
fn2 _ (ASTDouble b) =
do when (b == 0) $ throwL $ "division by zero"
return $ ASTDouble $ a / b
fn2 _ ast2 = throwL $ argError2 name ast1 ast2
fn1 _ ast1 = throwL $ argError1 name ast1
builtinFloor :: (String, AST)
builtinFloor = (name, ASTFunction fn1) where
name = "floor"
fn1 _ (ASTDouble dbl) = return $ ASTInteger $ floor dbl
fn1 _ ast = throwL $ argError1 name ast
builtinToDouble :: (String, AST)
builtinToDouble = (name, ASTFunction fn1) where
name = "to-double"
fn1 _ (ASTInteger int) = return $ ASTDouble $ fromIntegral int
fn1 _ ast = throwL $ argError1 name ast
builtinFmt :: (String, AST)
builtinFmt = (name, ASTFunction fn1) where
name = "fmt"
fn1 _ ast1@(ASTString str) =
return $ ASTFunction $ fn2 where
fn2 _ (ASTVector replacements) =
return $ ASTString $ T.unpack $ replaceAll (0 :: Int) replacements (T.pack str)
fn2 _ ast2 = throwL $ argError2 name ast1 ast2
fn1 _ ast1 = throwL $ argError1 name ast1
replaceAll _ [] text = text
replaceAll n (x:xs) text =
let text' = T.replace (T.pack $ "{" ++ show n ++ "}") (T.pack $ show x) text
in replaceAll (n + 1) xs text'
builtinHead :: (String, AST)
builtinHead = (name, ASTFunction fn1) where
name = "head"
fn1 _ (ASTVector vec) =
do when (length vec == 0) $ throwL $ name ++ " of empty vector"
return $ head vec
fn1 _ ast = throwL $ argError1 name ast
builtinTail :: (String, AST)
builtinTail = (name, ASTFunction fn1) where
name = "tail"
fn1 _ (ASTVector vec) =
do when (length vec == 0) $ throwL $ name ++ " of empty vector"
return $ ASTVector $ tail vec
fn1 _ ast = throwL $ argError1 name ast
builtinSubstr :: (String, AST)
builtinSubstr = (name, ASTFunction fn1) where
name = "substr"
fn1 _ ast1@(ASTInteger at) =
return $ ASTFunction $ fn2 where
fn2 _ ast2@(ASTInteger len) =
return $ ASTFunction $ fn3 where
fn3 _ (ASTString str) =
return $ ASTString $ drop at .> take len $ str
fn3 _ ast3 = throwL $ argError3 name ast1 ast2 ast3
fn2 _ ast2 = throwL $ argError2 name ast1 ast2
fn1 _ ast1 = throwL $ argError1 name ast1
builtinPrepend :: (String, AST)
builtinPrepend = (name, ASTFunction fn1) where
name = "prepend"
fn1 _ ast1 =
return $ ASTFunction $ fn2 where
fn2 _ (ASTVector vec) =
return $ ASTVector $ ast1 : vec
fn2 _ ast2 = throwL $ argError2 name ast1 ast2
builtinPrint :: (String, AST)
builtinPrint = (name, ASTFunction fn1) where
name = "print!"
fn1 _ (ASTString str) =
do liftIO $ putStr $ str
return ASTUnit
fn1 _ ast = throwL $ argError1 name ast
builtinConcat :: (String, AST)
builtinConcat = (name, ASTFunction fn1) where
name = "concat"
fn1 _ ast1@(ASTString str1) =
return $ ASTFunction $ fn2 where
fn2 _ (ASTString str2) =
return $ ASTString $ str1 ++ str2
fn2 _ ast2 = throwL $ argError2 name ast1 ast2
fn1 _ ast1 = throwL $ argError1 name ast1
builtinFatal :: (String, AST)
builtinFatal = (name, ASTFunction fn1) where
name = "fatal"
fn1 _ (ASTString str) =
throwL $ str
fn1 _ ast =
throwL $ argError1 name ast
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