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Improved variable definition error messages

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VegOwOtenks 2024-09-16 18:40:21 +02:00
parent d3f63b1d15
commit 5bc54cd13a
1 changed files with 5 additions and 3 deletions
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8
src/Lib.hs
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@ -102,9 +102,9 @@ updateVariables ds vs = foldl updateVariable (Right vs) ds
updateVariable :: Either String (Map String Rational) -> (String, Expr) -> Either String (Map String Rational)
updateVariable (Left e) _ = Left e
updateVariable (Right vs) (name, e) = case updateVariables nvs vs of
Left e -> Left e
Left e -> Left $ "In definition of variable '" ++ name ++ "':\n" ++ e
Right uvs -> case replaceVars e uvs of
Left e -> Left e
Left e -> Left $ "In definition of variable '" ++ name ++ "':\n" ++ e
Right exp -> Right $ Map.insert name (evaluate exp) uvs
where
nvs = extractVariableDefinitions e
@ -130,7 +130,9 @@ replaceVars (Binary op l r) vs = case leftBranch of
rationalPower :: Rational -> Rational -> Rational
rationalPower a b = rationalPower' (numerator a, denominator a) (numerator b, denominator b)
where
rationalPower' (a, b) (c, 1) = a ^ c % b ^ c
rationalPower' (a, b) (c, 1)
| c >= 0 = a ^ c % b ^ c
| otherwise = 1 / rationalPower (a % b) (-c % 1)
rationalPower' _ _ = error "Powers with unnatural numbers are not supported yet"
evaluate :: Expr -> Rational