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{-# LANGUAGE OverloadedStrings #-}
-- | bs primitives
--
-- I would like to reduce the number of primitives in the language to some
-- minimal number, like SKI combinator or Nock instructions. I'm not sure what
-- the minimal number is. The idea is to move primitives from here into core.scm
-- over time.
module Language.Bs.Primitives where
import Control.Exception hiding (handle)
import Control.Monad.Except
import Data.Text as T
import Data.Text.IO as TIO
import Language.Bs.Expr
import Network.HTTP
import System.Directory
import System.IO
type Prim = [(T.Text, Expr)]
type Unary = Expr -> Eval Expr
type Binary = Expr -> Expr -> Eval Expr
mkF :: ([Expr] -> Eval Expr) -> Expr
mkF = IFun . IFunc
primEnv :: Prim
primEnv = [
("+" , mkF $ binopFold (numOp (+)) (Numb 0) )
, ("*" , mkF $ binopFold (numOp (*)) (Numb 1) )
, ("string-append", mkF $ binopFold (strOp (<>)) (Tape "") )
, ("-" , mkF $ binop $ numOp (-))
, ("<" , mkF $ binop $ numCmp (<))
, ("<=" , mkF $ binop $ numCmp (<=))
, (">" , mkF $ binop $ numCmp (>))
, (">=" , mkF $ binop $ numCmp (>=))
, ("==" , mkF $ binop $ numCmp (==))
, ("even?" , mkF $ unop $ numBool even)
, ("odd?" , mkF $ unop $ numBool odd)
, ("neg?" , mkF $ unop $ numBool (< 0))
, ("pos?" , mkF $ unop $ numBool (> 0))
, ("eq?" , mkF $ binop eqCmd )
, ("null?" , mkF $ unop (eqCmd Nil) )
, ("bl-eq?" , mkF $ binop $ eqOp (==))
, ("and" , mkF $ binopFold (eqOp (&&)) (Bool True))
, ("or" , mkF $ binopFold (eqOp (||)) (Bool False))
, ("not" , mkF $ unop $ notOp)
, ("cons" , mkF $ Language.Bs.Primitives.cons)
, ("cdr" , mkF $ Language.Bs.Primitives.cdr)
, ("car" , mkF $ Language.Bs.Primitives.car)
, ("quote" , mkF $ quote)
, ("file?" , mkF $ unop fileExists)
, ("slurp" , mkF $ unop slurp)
, ("wslurp" , mkF $ unop wSlurp)
, ("put" , mkF $ binop put)
]
unop :: Unary -> [Expr] -> Eval Expr
unop op [x] = op x
unop _ args = throw $ NumArgs 1 args
binop :: Binary -> [Expr] -> Eval Expr
binop op [x,y] = op x y
binop _ args = throw $ NumArgs 2 args
fileExists :: Expr -> Eval Expr
fileExists (Tape txt) = Bool <$> liftIO (doesFileExist $ T.unpack txt)
fileExists val = throw $ TypeMismatch "read expects string, instead got: " val
slurp :: Expr -> Eval Expr
slurp (Tape txt) = liftIO $ wFileSlurp txt
slurp val = throw $ TypeMismatch "read expects string, instead got: " val
wFileSlurp :: T.Text -> IO Expr
wFileSlurp fileName = withFile (T.unpack fileName) ReadMode go
where go = readTextFile fileName
openURL :: T.Text -> IO Expr
openURL x = do
req <- simpleHTTP (getRequest $ T.unpack x)
body <- getResponseBody req
return $ Tape $ T.pack body
wSlurp :: Expr -> Eval Expr
wSlurp (Tape txt) = liftIO $ openURL txt
wSlurp val = throw $ TypeMismatch "wSlurp expects a string, instead got: " val
readTextFile :: T.Text -> Handle -> IO Expr
readTextFile fileName handle = do
exists <- doesFileExist $ T.unpack fileName
if exists
then (TIO.hGetContents handle) >>= (return . Tape)
else throw $ ReadFileError $ T.concat [" file does not exist: ", fileName]
put :: Expr -> Expr -> Eval Expr
put (Tape file) (Tape msg) = liftIO $ wFilePut file msg
put (Tape _) val = throw $ TypeMismatch "put expects string in the second argument (try using show), instead got: " val
put val _ = throw $ TypeMismatch "put expects string, instead got: " val
wFilePut :: T.Text -> T.Text -> IO Expr
wFilePut fileName msg = withFile (T.unpack fileName) WriteMode go
where go = putTextFile fileName msg
putTextFile :: T.Text -> T.Text -> Handle -> IO Expr
putTextFile fileName msg handle = do
canWrite <- hIsWritable handle
if canWrite
then (TIO.hPutStr handle msg) >> (return $ Tape msg)
else throw $ ReadFileError $ T.concat [" file does not exist: ", fileName]
binopFold :: Binary -> Expr -> [Expr] -> Eval Expr
binopFold op farg args = case args of
[]-> throw $ NumArgs 2 args
[a,b] -> op a b
_ -> foldM op farg args
numBool :: (Integer -> Bool) -> Expr -> Eval Expr
numBool op (Numb x) = return $ Bool $ op x
numBool _ x = throw $ TypeMismatch "numeric op " x
numOp :: (Integer -> Integer -> Integer) -> Expr -> Expr -> Eval Expr
numOp op (Numb x) (Numb y) = return $ Numb $ op x y
numOp _ Nil (Numb y) = return $ Numb y
numOp _ (Numb x) Nil = return $ Numb x
numOp _ x (Numb _) = throw $ TypeMismatch "numeric op" x
numOp _ (Numb _) y = throw $ TypeMismatch "numeric op" y
numOp _ x _ = throw $ TypeMismatch "numeric op" x
strOp :: (T.Text -> T.Text -> T.Text) -> Expr -> Expr -> Eval Expr
strOp op (Tape x) (Tape y) = return $ Tape $ op x y
strOp _ Nil (Tape y) = return $ Tape y
strOp _ (Tape x) Nil = return $ Tape x
strOp _ x (Tape _) = throw $ TypeMismatch "string op" x
strOp _ (Tape _) y = throw $ TypeMismatch "string op" y
strOp _ x _ = throw $ TypeMismatch "string op" x
eqOp :: (Bool -> Bool -> Bool) -> Expr -> Expr -> Eval Expr
eqOp op (Bool x) (Bool y) = return $ Bool $ op x y
eqOp _ x (Bool _) = throw $ TypeMismatch "bool op" x
eqOp _ (Bool _) y = throw $ TypeMismatch "bool op" y
eqOp _ x _ = throw $ TypeMismatch "bool op" x
numCmp :: (Integer -> Integer -> Bool) -> Expr -> Expr -> Eval Expr
numCmp op (Numb x) (Numb y) = return . Bool $ op x y
numCmp _ x (Numb _) = throw $ TypeMismatch "numeric op" x
numCmp _ (Numb _) y = throw $ TypeMismatch "numeric op" y
numCmp _ x _ = throw $ TypeMismatch "numeric op" x
notOp :: Expr -> Eval Expr
notOp (Bool True) = return $ Bool False
notOp (Bool False) = return $ Bool True
notOp x = throw $ TypeMismatch " not expects Bool" x
eqCmd :: Expr -> Expr -> Eval Expr
eqCmd (Atom x) (Atom y) = return . Bool $ x == y
eqCmd (Numb x) (Numb y) = return . Bool $ x == y
eqCmd (Tape x) (Tape y) = return . Bool $ x == y
eqCmd (Bool x) (Bool y) = return . Bool $ x == y
eqCmd Nil Nil = return $ Bool True
eqCmd _ _ = return $ Bool False
cons :: [Expr] -> Eval Expr
cons [x,(List ys)] = return $ List $ x:ys
cons [x,y] = return $ List [x,y]
cons _ = throw $ ExpectedList "cons, in second argument"
car :: [Expr] -> Eval Expr
car [List [] ] = return Nil
car [List (x:_)] = return x
car [] = return Nil
car _ = throw $ ExpectedList "car"
cdr :: [Expr] -> Eval Expr
cdr [List (_:xs)] = return $ List xs
cdr [List []] = return Nil
cdr [] = return Nil
cdr _ = throw $ ExpectedList "cdr"
quote :: [Expr] -> Eval Expr
quote [List xs] = return $ List $ Atom "quote" : xs
quote [expr] = return $ List $ Atom "quote" : [expr]
quote args = throw $ NumArgs 1 args
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