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Instruction.hs
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Instruction.hs
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module Instruction where
import Funcs
import Error
data ArithE = INT Int
| FLT Float
| VAR String
| Add ArithE ArithE
| Sub ArithE ArithE
| Mul ArithE ArithE
| Div ArithE ArithE
| Eq ArithE ArithE
| Lt ArithE ArithE
| Gt ArithE ArithE
| Lte ArithE ArithE
| Gte ArithE ArithE
deriving (Eq)
data Instruction = ClrHome
| Break
| Stop
| Pause
| End
| Display String
| Output Int Int String
| Label String
| Goto String
| Prompt String
| Input String
| Menu [String]
| Set String ArithE
| For String (Int, Int, Int) [Instruction]
| While String (Int, Int, Int) [Instruction]
deriving (Eq)
instance Show ArithE where
show (INT x) = show x
show (FLT x) = show x
show (VAR s) = s
show (Add l r) = join ["(", (show l), "+", (show r), ")"]
show (Sub l r) = join ["(", (show l), "-", (show r), ")"]
show (Mul l r) = join ["(", (show l), "*", (show r), ")"]
show (Div l r) = join ["(", (show l), "/", (show r), ")"]
show (Eq l r) = join ["(", (show l), "=", (show r), ")"]
show (Lt l r) = join ["(", (show l), "<", (show r), ")"]
show (Gt l r) = join ["(", (show l), ">", (show r), ")"]
show (Lte l r) = join ["(", (show l), "<=", (show r), ")"]
show (Gte l r) = join ["(", (show l), ">=", (show r), ")"]
-- Implement Show instance for the entire Instruction set
-- Evaluatees like FOR or WHILE are more complex and not
-- defined here, see the evaluation section
instance Show Instruction where
show ClrHome = "ClrHome"
show Break = "Stop"
show Stop = "Stop"
show Pause = "Pause"
show End = "End"
show (Display s) = "Disp " ++ s
show (Output x y s) = join ["Output(", (show x), ",", (show y), ",\"", s, "\")"]
show (Label s) = "LBL " ++ s
show (Goto s) = "GOTO " ++ s
show (Prompt s) = "Prompt " ++ s
show (Input s) = "Input " ++ s
show (Set s e) = join [(show e), "->", s]
show (For s (b, e, i) _) = join ["FOR(",s, ",", (show b), ",", (show e), ",", (show i), ")"]
-- new and improved TI-83 state accumulator type
data TIState = TIState
{ tilines :: [String]
, tilabels :: [String]
, tivars :: [String]
, ticount :: Int
} deriving (Show, Eq)
type TIEither = Either [TIError] TIState
mkErrStr :: TIState -> [String] -> String
mkErrStr s lst = join $ lst ++ [" (line ", (show linum), ")"]
where linum = (ticount s) + 1
initState :: TIState
initState = TIState {
tilines = [],
tilabels = [],
tivars = [],
ticount = 0
}
addLine :: TIState -> [String] -> TIState
addLine initS new_line = initS {
tilines = (tilines initS) ++ new_line,
ticount = (ticount initS) + (length new_line)
}
addData :: TIState -> [String] -> [String] -> [String] -> TIState
addData initS lines lbls vars = initS {
tilines = (tilines initS) ++ lines,
tilabels = (tilabels initS) ++ lbls,
tivars = (tivars initS) ++ vars,
ticount = (ticount initS) + (length lines)
}
findVars :: ArithE -> [String]
findVars (VAR x) = [x]
findVars (Add l r) = (findVars l) ++ (findVars r)
findVars (Sub l r) = (findVars l) ++ (findVars r)
findVars (Mul l r) = (findVars l) ++ (findVars r)
findVars (Div l r) = (findVars l) ++ (findVars r)
findVars (Eq l r) = (findVars l) ++ (findVars r)
findVars (Lt l r) = (findVars l) ++ (findVars r)
findVars (Gt l r) = (findVars l) ++ (findVars r)
findVars (Lte l r) = (findVars l) ++ (findVars r)
findVars (Gte l r) = (findVars l) ++ (findVars r)
findVars _ = []
simplify :: ArithE -> ArithE
simplify (Add (INT l) (INT r)) = INT (l + r)
simplify (Add (INT l) (FLT r)) = FLT ((fromIntegral l) + r)
simplify (Add (FLT l) (FLT r)) = FLT (l + r)
simplify (Sub (INT l) (INT r)) = INT (l - r)
simplify (Sub (INT l) (FLT r)) = FLT ((fromIntegral l) - r)
simplify (Sub (FLT l) (FLT r)) = FLT (l - r)
simplify (Mul (INT 0) (INT _)) = INT 0
simplify (Mul (INT _) (INT 0)) = INT 0
simplify (Mul (INT 1) (INT x)) = INT x
simplify (Mul (INT x) (INT 1)) = INT x
simplify (Div x (INT 1)) = x
simplify (Eq l r) = Eq (simplify l) (simplify r)
simplify (Lt l r) = Lt (simplify l) (simplify r)
simplify (Gt l r) = Gt (simplify l) (simplify r)
simplify (Lte l r) = Lte (simplify l) (simplify r)
simplify (Gte l r) = Gte (simplify l) (simplify r)
simplify (Add l r) = Add (simplify l) (simplify r)
simplify (Sub l r) = Sub (simplify l) (simplify r)
simplify (Mul l r) = Mul (simplify l) (simplify r)
simplify (Div l r) = Div (simplify l) (simplify r)
simplify x = x
findErrors :: ArithE -> Maybe String
findErrors (Div _ (INT 0)) = Just "Division by zero detected"
findErrors (Div _ (FLT 0.0)) = Just "Division by zero detected"
findErrors _ = Nothing
-- end Instruction.hs