1 files changed, 100 insertions, 1 deletions
diff --git a/src/Utils.hs b/src/Utils.hs
index d2068d4..fe0a9c2 100644
--- a/src/Utils.hs
+++ b/src/Utils.hs
@@ -1,8 +1,104 @@
 {-# OPTIONS_GHC -Wno-missing-export-lists #-}
-{-# OPTIONS_GHC -Wno-missing-signatures #-}
 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
+}
+
+type LContext a = ReaderT Config (ExceptT LException IO) a
+
+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
+    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
+    ASTHashMap a <= ASTHashMap b = a <= b
+    _ <= _ = 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"
+
+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 $>
@@ -14,3 +110,6 @@ oddElems (x:xs) = x:evenElems xs
 evenElems :: [a] -> [a]
 evenElems [] = []
 evenElems (_:xs) = oddElems xs
+
+throwL :: String -> LContext a
+throwL s = throwError $ LException s