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haskell_rule_evaluator
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data BBool a b = BTrue a | BFalse b deriving (Show) | |
true :: a -> BBool a b | |
true a = BTrue a | |
trueMap :: (a -> b) -> BBool a c -> BBool b c | |
trueMap f (BTrue x) = BTrue (f x) | |
trueMap _ (BFalse x) = BFalse x | |
falseMap :: (a -> b) -> BBool c a -> BBool c b | |
falseMap f (BFalse x) = BFalse (f x) | |
falseMap _ (BTrue x) = BTrue x | |
type Rule = BBool () String | |
data RuleExpression = | |
RuleOr RuleExpression RuleExpression | |
| RuleAnd RuleExpression RuleExpression | |
| RuleT Rule | |
-- rule1 || rule2 | |
evalRuleExpression :: RuleExpression -> Rule | |
evalRuleExpression (RuleT r) = r | |
evalRuleExpression (RuleOr re1 re2) = | |
let | |
evalOr :: Rule -> Rule -> Rule | |
evalOr (BTrue _) _ = BTrue () -- le cas de droite est il evalue ? | |
evalOr _ (BTrue _) = BTrue () | |
evalOr (BFalse s1) (BFalse s2) = BFalse (s2) | |
in | |
evalOr (evalRuleExpression re1) (evalRuleExpression re2) | |
evalRuleExpression (RuleAnd re1 re2) = | |
let | |
evalAnd :: Rule -> Rule -> Rule | |
evalAnd (BFalse s) _ = BFalse s | |
evalAnd _ (BFalse s) = BFalse s | |
evalAnd (BTrue _) (BTrue _) = BTrue () | |
in | |
evalAnd (evalRuleExpression re1) (evalRuleExpression re2) | |
rule1 :: Rule | |
rule1 = BTrue () | |
rule2 :: Rule | |
rule2 = BFalse "gwaa" | |
(&&&) = RuleAnd | |
(|||) = RuleOr | |
ruleEngine1 :: RuleExpression | |
ruleEngine1 = (RuleT rule1) &&& (RuleT rule2) | |
ruleEngine2 :: RuleExpression | |
ruleEngine2 = (RuleT rule1) ||| (RuleT rule2) | |
ruleEngine = | |
(ruleEngine1 &&& ruleEngine2) ||| | |
ruleEngine2 | |
main :: IO () | |
main = do | |
putStrLn $ show (evalRuleExpression (ruleEngine1 ||| ruleEngine2)) |
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