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{-# OPTIONS_GHC -Wno-missing-export-lists #-}
module Utils where
import Control.Monad.Except
import Control.Monad.Reader
import qualified Data.Map as M
import qualified Data.List as L
import qualified Data.Char as C
-- TYPES
newtype LException = LException String
data Config = Config {
configScriptFileName :: Maybe String,
configVerboseMode :: Bool,
configShowHelp :: Bool,
configPrintEvaled :: Bool,
configPrintCallStack :: Bool
}
type LContext a = ReaderT Config (ExceptT LException IO) a
runL :: Config -> LContext a -> IO (Either LException a)
runL config lc = runExceptT $ runReaderT lc config
type Env = M.Map String AST
type LFunction = (Env -> AST -> LContext AST)
data AST
= ASTInteger Int
| ASTDouble Double
| ASTSymbol String
| ASTBoolean Bool
| ASTString String
| ASTVector [AST]
| ASTFunctionCall [AST]
| ASTHashMap (M.Map AST AST)
| ASTFunction LFunction
| ASTUnit
instance (Show AST) where
show (ASTInteger n) = show n
show (ASTDouble n) = show n
show (ASTSymbol s) = s
show (ASTBoolean b) = show b $> map C.toLower
show (ASTString s) = show s
show (ASTVector v) = "[" ++ L.intercalate " " (map show v) ++ "]"
show (ASTFunctionCall v) = "(" ++ L.intercalate " " (map show v) ++ ")"
show (ASTHashMap m) =
let flattenMap = M.assocs .> L.concatMap (\(k, v) -> [k, v])
in "{" ++ L.intercalate " " (map show $ flattenMap m) ++ "}"
show (ASTFunction _) = "<fn>"
show ASTUnit = "<unit>"
instance (Eq AST) where
ASTInteger a == ASTInteger b = a == b
ASTDouble a == ASTDouble b = a == b
ASTSymbol a == ASTSymbol b = a == b
ASTBoolean a == ASTBoolean b = a == b
ASTString a == ASTString b = a == b
ASTVector a == ASTVector b = a == b
ASTFunctionCall a == ASTFunctionCall b = a == b
ASTHashMap a == ASTHashMap b = a == b
ASTUnit == ASTUnit = True
_ == _ = False
instance (Ord AST) where
ASTInteger a <= ASTInteger b = a <= b
ASTDouble a <= ASTDouble b = a <= b
ASTSymbol a <= ASTSymbol b = a <= b
ASTBoolean a <= ASTBoolean b = a <= b
ASTString a <= ASTString b = a <= b
ASTVector a <= ASTVector b = a <= b
ASTFunctionCall a <= ASTFunctionCall b = a <= b
ASTHashMap a <= ASTHashMap b = a <= b
ASTUnit <= ASTUnit = True
_ <= _ = False
assertIsASTFunction :: AST -> LContext AST
assertIsASTFunction ast = case ast of
(ASTFunction _) -> return ast
_ -> throwL $ show ast ++ " is not a function"
assertIsASTInteger :: AST -> LContext AST
assertIsASTInteger ast = case ast of
(ASTInteger _) -> return ast
_ -> throwL $ show ast ++ " is not an integer"
assertIsASTSymbol :: AST -> LContext AST
assertIsASTSymbol ast = case ast of
(ASTSymbol _) -> return ast
_ -> throwL $ show ast ++ " is not a symbol"
assertIsASTVector :: AST -> LContext AST
assertIsASTVector ast = case ast of
(ASTVector _) -> return ast
_ -> throwL $ show ast ++ " is not a vector"
assertIsASTString :: AST -> LContext AST
assertIsASTString ast = case ast of
(ASTString _) -> return ast
_ -> throwL $ show ast ++ " is not a string"
assertIsASTFunctionCall :: AST -> LContext AST
assertIsASTFunctionCall ast = case ast of
(ASTFunctionCall _) -> return ast
_ -> throwL $ show ast ++ " is not a function call or body"
-- UTILS
(.>) :: (a -> b) -> (b -> c) -> a -> c
(.>) = flip (.)
($>) :: b -> (b -> c) -> c
($>) = flip ($)
infixr 6 $>
oddElems :: [a] -> [a]
oddElems [] = []
oddElems (x:xs) = x:evenElems xs
evenElems :: [a] -> [a]
evenElems [] = []
evenElems (_:xs) = oddElems xs
throwL :: String -> LContext a
throwL s = throwError $ LException s
asPairsM :: [a] -> LContext [(a, a)]
asPairsM [] = return []
asPairsM (a:b:rest) = do
restPaired <- asPairsM rest
return $ (a, b) : restPaired
asPairsM _ = throwL "odd number of elements to pair up"
asPairs :: [a] -> [(a, a)]
asPairs [] = []
asPairs (a:b:rest) =
let restPaired = asPairs rest
in (a, b) : restPaired
asPairs _ = error "odd number of elements to pair up"
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