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sign testing for amounts

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This commit is contained in:
Simon Michael 2010-07-27 23:20:20 +00:00
parent c68eec5afb
commit c42496b134
1 changed files with 11 additions and 0 deletions
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11
hledger-lib/Hledger/Data/Amount.hs
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@ -153,6 +153,10 @@ isReallyZeroAmount :: Amount -> Bool
isReallyZeroAmount = null . filter (`elem` "123456789") . printf ("%."++show zeroprecision++"f") . quantity
where zeroprecision = 8
-- | Is this amount negative ? The price is ignored.
isNegativeAmount :: Amount -> Bool
isNegativeAmount Amount{quantity=q} = q < 0
-- | Access a mixed amount's components.
amounts :: MixedAmount -> [Amount]
amounts (Mixed as) = as
@ -166,6 +170,13 @@ isZeroMixedAmount = all isZeroAmount . amounts . normaliseMixedAmount
isReallyZeroMixedAmount :: MixedAmount -> Bool
isReallyZeroMixedAmount = all isReallyZeroAmount . amounts . normaliseMixedAmount
-- | Is this mixed amount negative, if it can be normalised to a single commodity ?
isNegativeMixedAmount :: MixedAmount -> Maybe Bool
isNegativeMixedAmount m = case as of [a] -> Just $ isNegativeAmount a
_ -> Nothing
where
as = amounts $ normaliseMixedAmount m
-- | Is this mixed amount "really" zero, after converting to cost
-- commodities where possible ?
isReallyZeroMixedAmountCost :: MixedAmount -> Bool