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definition module WhileCommon
from StdOverloaded import class toString, class zero
from GenEq import generic gEq
from Common import ::Either, ::Error
from WhileLexer import ::Token
from Yard import ::Parser
:: Var :== String
:: State :== Var -> Either Error Int
:: AExpr = Var Var
| Lit Int
| Op AExpr Operator AExpr
:: Operator = Add | Sub | Mul | Div
:: BExpr = Bool Bool
| Not BExpr
| And BExpr BExpr
| Or BExpr BExpr
| Comp AExpr Comparator AExpr
:: Comparator = Eq | Ne | Le | Lt | Ge | Gt
derive gEq AExpr, Operator, BExpr, Comparator
instance zero State
instance toString AExpr
instance toString Operator
instance toString BExpr
instance toString Comparator
class run s :: s State -> Either Error State
class eval i o :: i State -> Either Error o
instance eval AExpr Int
instance eval BExpr Bool
class parse o :: [Token] -> Either Error o
paexpr :: Parser Token AExpr
pbexpr :: Parser Token BExpr
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