476 lines
19 KiB
Haskell
476 lines
19 KiB
Haskell
{-# LANGUAGE StandaloneDeriving #-}
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{-|
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A simple "Amount" is some quantity of money, shares, or anything else.
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It has a (possibly null) "Commodity" and a numeric quantity:
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@
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$1
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£-50
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EUR 3.44
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GOOG 500
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1.5h
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90 apples
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0
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@
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It may also have an assigned unit price, which is another (unpriced)
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simple amount in a different commodity. If present, this is rendered like so:
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@
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EUR 3 \@ $1.35
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@
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A "MixedAmount" is zero or more simple amounts, so can represent multiple
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commodities; this is the type most often used:
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@
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0
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$50 + EUR 3
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16h + $13.55 + AAPL 500 + 6 oranges
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@
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When a mixed amount has been \"normalised\", it has no more than one amount
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in each commodity and no zero amounts; or it has just a single zero amount
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and no others.
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We can do two kinds of limited arithmetic with simple or mixed amounts:
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price-preserving (for amounts with the same prices) or price-ignoring
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(ignores and discards any prices).
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-}
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-- XXX due for review/rewrite
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module Hledger.Data.Amount (
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-- * Amount
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nullamt,
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amountWithCommodity,
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canonicaliseAmountCommodity,
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setAmountPrecision,
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-- ** arithmetic
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costOfAmount,
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divideAmount,
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-- ** rendering
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showAmount,
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showAmountDebug,
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showAmountWithoutPrice,
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maxprecision,
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maxprecisionwithpoint,
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-- * MixedAmount
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nullmixedamt,
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missingamt,
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amounts,
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normaliseMixedAmount,
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canonicaliseMixedAmountCommodity,
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mixedAmountWithCommodity,
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setMixedAmountPrecision,
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-- ** arithmetic
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costOfMixedAmount,
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divideMixedAmount,
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isNegativeMixedAmount,
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isZeroMixedAmount,
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isReallyZeroMixedAmountCost,
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-- ** rendering
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showMixedAmount,
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showMixedAmountDebug,
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showMixedAmountOrZero,
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showMixedAmountOrZeroWithoutPrice,
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showMixedAmountWithoutPrice,
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showMixedAmountWithPrecision,
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-- * misc.
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tests_Hledger_Data_Amount
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) where
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import Data.Char (isDigit)
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import Data.List
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import Data.Map (findWithDefault)
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import Test.HUnit
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import Text.Printf
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import qualified Data.Map as Map
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import Hledger.Data.Types
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import Hledger.Data.Commodity
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import Hledger.Utils
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deriving instance Show HistoricalPrice
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-------------------------------------------------------------------------------
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-- Amount
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instance Show Amount where show = showAmount
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instance Num Amount where
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abs (Amount c q p) = Amount c (abs q) p
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signum (Amount c q p) = Amount c (signum q) p
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fromInteger i = Amount (comm "") (fromInteger i) Nothing
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negate a@Amount{quantity=q} = a{quantity=(-q)}
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(+) = similarAmountsOp (+)
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(-) = similarAmountsOp (-)
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(*) = similarAmountsOp (*)
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-- | The empty simple amount.
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nullamt :: Amount
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nullamt = Amount unknown 0 Nothing
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-- | Apply a binary arithmetic operator to two amounts, ignoring and
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-- discarding any assigned prices, and converting the first to the
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-- commodity of the second in a simplistic way (1-1 exchange rate).
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-- The highest precision of either amount is preserved in the result.
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similarAmountsOp :: (Double -> Double -> Double) -> Amount -> Amount -> Amount
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similarAmountsOp op a@(Amount Commodity{precision=ap} _ _) (Amount bc@Commodity{precision=bp} bq _) =
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Amount bc{precision=max ap bp} (quantity (amountWithCommodity bc a) `op` bq) Nothing
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-- | Convert an amount to the specified commodity, ignoring and discarding
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-- any assigned prices and assuming an exchange rate of 1.
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amountWithCommodity :: Commodity -> Amount -> Amount
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amountWithCommodity c (Amount _ q _) = Amount c q Nothing
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-- | Convert an amount to the commodity of its assigned price, if any. Notes:
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-- - price amounts must be MixedAmounts with exactly one component Amount (or there will be a runtime error)
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-- - price amounts should be positive, though this is not currently enforced
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costOfAmount :: Amount -> Amount
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costOfAmount a@(Amount _ q price) =
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case price of
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Nothing -> a
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Just (UnitPrice (Mixed [Amount pc pq Nothing])) -> Amount pc (pq*q) Nothing
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Just (TotalPrice (Mixed [Amount pc pq Nothing])) -> Amount pc (pq*signum q) Nothing
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_ -> error' "costOfAmount: Malformed price encountered, programmer error"
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-- | Divide an amount's quantity by a constant.
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divideAmount :: Amount -> Double -> Amount
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divideAmount a@Amount{quantity=q} d = a{quantity=q/d}
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-- | Is this amount negative ? The price is ignored.
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isNegativeAmount :: Amount -> Bool
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isNegativeAmount Amount{quantity=q} = q < 0
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-- | Does this amount appear to be zero when displayed with its given precision ?
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isZeroAmount :: Amount -> Bool
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isZeroAmount = null . filter (`elem` "123456789") . showAmountWithoutPriceOrCommodity
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-- | Is this amount "really" zero, regardless of the display precision ?
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-- Since we are using floating point, for now just test to some high precision.
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isReallyZeroAmount :: Amount -> Bool
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isReallyZeroAmount = null . filter (`elem` "123456789") . printf ("%."++show zeroprecision++"f") . quantity
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where zeroprecision = 8
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-- | Get the string representation of an amount, based on its commodity's
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-- display settings except using the specified precision.
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showAmountWithPrecision :: Int -> Amount -> String
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showAmountWithPrecision p = showAmount . setAmountPrecision p
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-- | Set the display precision in the amount's commodity.
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setAmountPrecision :: Int -> Amount -> Amount
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setAmountPrecision p a@Amount{commodity=c} = a{commodity=c{precision=p}}
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-- | Get the unambiguous string representation of an amount, for debugging.
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showAmountDebug :: Amount -> String
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showAmountDebug (Amount c q pri) = printf "Amount {commodity = %s, quantity = %s, price = %s}"
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(show c) (show q) (maybe "" showPriceDebug pri)
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-- | Get the string representation of an amount, without any \@ price.
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showAmountWithoutPrice :: Amount -> String
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showAmountWithoutPrice a = showAmount a{price=Nothing}
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-- | Get the string representation of an amount, without any price or commodity symbol.
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showAmountWithoutPriceOrCommodity :: Amount -> String
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showAmountWithoutPriceOrCommodity a@Amount{commodity=c} = showAmount a{commodity=c{symbol=""}, price=Nothing}
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showPrice :: Price -> String
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showPrice (UnitPrice pa) = " @ " ++ showMixedAmount pa
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showPrice (TotalPrice pa) = " @@ " ++ showMixedAmount pa
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showPriceDebug :: Price -> String
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showPriceDebug (UnitPrice pa) = " @ " ++ showMixedAmountDebug pa
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showPriceDebug (TotalPrice pa) = " @@ " ++ showMixedAmountDebug pa
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-- | Get the string representation of an amount, based on its commodity's
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-- display settings. Amounts whose string representation would mean zero
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-- are rendered as just "0".
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showAmount :: Amount -> String
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showAmount (Amount (Commodity {symbol="AUTO"}) _ _) = "" -- can appear in an error message
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showAmount a@(Amount (Commodity {symbol=sym,side=side,spaced=spaced}) _ pri) =
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case side of
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L -> printf "%s%s%s%s" sym' space quantity' price
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R -> printf "%s%s%s%s" quantity' space sym' price
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where
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quantity = showamountquantity a
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displayingzero = null $ filter (`elem` "123456789") $ quantity
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(quantity',sym') | displayingzero = ("0","")
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| otherwise = (quantity,quoteCommoditySymbolIfNeeded sym)
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space = if (not (null sym') && spaced) then " " else ""
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price = maybe "" showPrice pri
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-- | Get the string representation of the number part of of an amount,
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-- using the display settings from its commodity.
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showamountquantity :: Amount -> String
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showamountquantity (Amount (Commodity {decimalpoint=d,precision=p,separator=s,separatorpositions=spos}) q _) =
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punctuatenumber d s spos $ qstr
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where
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-- isint n = fromIntegral (round n) == n
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qstr -- p == maxprecision && isint q = printf "%d" (round q::Integer)
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| p == maxprecisionwithpoint = printf "%f" q
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| p == maxprecision = chopdotzero $ printf "%f" q
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| otherwise = printf ("%."++show p++"f") q
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-- | Replace a number string's decimal point with the specified character,
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-- and add the specified digit group separators.
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punctuatenumber :: Char -> Char -> [Int] -> String -> String
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punctuatenumber dec sep grps str = sign ++ reverse (addseps sep (extend grps) (reverse int)) ++ frac''
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where
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(sign,num) = break isDigit str
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(int,frac) = break (=='.') num
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frac' = dropWhile (=='.') frac
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frac'' | null frac' = ""
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| otherwise = dec:frac'
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extend [] = []
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extend gs = init gs ++ repeat (last gs)
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addseps _ [] str = str
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addseps sep (g:gs) str
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| length str <= g = str
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| otherwise = let (s,rest) = splitAt g str
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in s ++ [sep] ++ addseps sep gs rest
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chopdotzero str = reverse $ case reverse str of
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'0':'.':s -> s
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s -> s
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-- | For rendering: a special precision value which means show all available digits.
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maxprecision :: Int
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maxprecision = 999998
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-- | For rendering: a special precision value which forces display of a decimal point.
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maxprecisionwithpoint :: Int
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maxprecisionwithpoint = 999999
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-- | Replace an amount's commodity with the canonicalised version from
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-- the provided commodity map.
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canonicaliseAmountCommodity :: Maybe (Map.Map String Commodity) -> Amount -> Amount
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canonicaliseAmountCommodity Nothing = id
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canonicaliseAmountCommodity (Just canonicalcommoditymap) = fixamount
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where
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-- like journalCanonicaliseAmounts
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fixamount a@Amount{commodity=c} = a{commodity=fixcommodity c}
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fixcommodity c@Commodity{symbol=s} = findWithDefault c s canonicalcommoditymap
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-------------------------------------------------------------------------------
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-- MixedAmount
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instance Show MixedAmount where show = showMixedAmount
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instance Num MixedAmount where
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fromInteger i = Mixed [Amount (comm "") (fromInteger i) Nothing]
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negate (Mixed as) = Mixed $ map negate as
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(+) (Mixed as) (Mixed bs) = normaliseMixedAmount $ Mixed $ as ++ bs
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(*) = error' "programming error, mixed amounts do not support multiplication"
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abs = error' "programming error, mixed amounts do not support abs"
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signum = error' "programming error, mixed amounts do not support signum"
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-- | The empty mixed amount.
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nullmixedamt :: MixedAmount
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nullmixedamt = Mixed []
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-- | A temporary value for parsed transactions which had no amount specified.
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missingamt :: MixedAmount
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missingamt = Mixed [Amount unknown{symbol="AUTO"} 0 Nothing]
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-- | Simplify a mixed amount by removing redundancy in its component amounts,
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-- as follows:
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--
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-- 1. combine amounts which have the same commodity, discarding all but the first's price.
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--
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-- 2. remove zero amounts
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--
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-- 3. if there are no amounts at all, add a single zero amount
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normaliseMixedAmount :: MixedAmount -> MixedAmount
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normaliseMixedAmount (Mixed as) = Mixed as''
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where
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as'' = if null nonzeros then [nullamt] else nonzeros
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(_,nonzeros) = partition (\a -> isReallyZeroAmount a && Mixed [a] /= missingamt) as'
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as' = map sumAmountsDiscardingAllButFirstPrice $ group $ sort as
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sort = sortBy (\a1 a2 -> compare (sym a1) (sym a2))
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group = groupBy (\a1 a2 -> sym a1 == sym a2)
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sym = symbol . commodity
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sumAmountsDiscardingAllButFirstPrice [] = nullamt
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sumAmountsDiscardingAllButFirstPrice as = (sum as){price=price $ head as}
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-- | Get a mixed amount's component amounts.
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amounts :: MixedAmount -> [Amount]
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amounts (Mixed as) = as
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-- | Convert a mixed amount's component amounts to the commodity of their
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-- assigned price, if any.
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costOfMixedAmount :: MixedAmount -> MixedAmount
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costOfMixedAmount (Mixed as) = Mixed $ map costOfAmount as
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-- | Divide a mixed amount's quantities by a constant.
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divideMixedAmount :: MixedAmount -> Double -> MixedAmount
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divideMixedAmount (Mixed as) d = Mixed $ map (flip divideAmount d) as
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-- | Is this mixed amount negative, if it can be normalised to a single commodity ?
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isNegativeMixedAmount :: MixedAmount -> Maybe Bool
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isNegativeMixedAmount m = case as of [a] -> Just $ isNegativeAmount a
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_ -> Nothing
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where as = amounts $ normaliseMixedAmount m
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-- | Does this mixed amount appear to be zero when displayed with its given precision ?
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isZeroMixedAmount :: MixedAmount -> Bool
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isZeroMixedAmount = all isZeroAmount . amounts . normaliseMixedAmount
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-- | Is this mixed amount "really" zero ? See isReallyZeroAmount.
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isReallyZeroMixedAmount :: MixedAmount -> Bool
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isReallyZeroMixedAmount = all isReallyZeroAmount . amounts . normaliseMixedAmount
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-- | Is this mixed amount "really" zero, after converting to cost
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-- commodities where possible ?
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isReallyZeroMixedAmountCost :: MixedAmount -> Bool
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isReallyZeroMixedAmountCost = isReallyZeroMixedAmount . costOfMixedAmount
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-- -- | Convert a mixed amount to the specified commodity, assuming an exchange rate of 1.
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mixedAmountWithCommodity :: Commodity -> MixedAmount -> Amount
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mixedAmountWithCommodity c (Mixed as) = Amount c total Nothing
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where
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total = sum $ map (quantity . amountWithCommodity c) as
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-- -- | MixedAmount derived Eq instance in Types.hs doesn't know that we
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-- -- want $0 = EUR0 = 0. Yet we don't want to drag all this code over there.
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-- -- For now, use this when cross-commodity zero equality is important.
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-- mixedAmountEquals :: MixedAmount -> MixedAmount -> Bool
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-- mixedAmountEquals a b = amounts a' == amounts b' || (isZeroMixedAmount a' && isZeroMixedAmount b')
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-- where a' = normaliseMixedAmount a
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-- b' = normaliseMixedAmount b
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-- | Get the string representation of a mixed amount, showing each of
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-- its component amounts. NB a mixed amount can have an empty amounts
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-- list in which case it shows as \"\".
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showMixedAmount :: MixedAmount -> String
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showMixedAmount m = vConcatRightAligned $ map show $ amounts $ normaliseMixedAmount m
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-- | Set the display precision in the amount's commodities.
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setMixedAmountPrecision :: Int -> MixedAmount -> MixedAmount
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setMixedAmountPrecision p (Mixed as) = Mixed $ map (setAmountPrecision p) as
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-- | Get the string representation of a mixed amount, showing each of its
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-- component amounts with the specified precision, ignoring their
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-- commoditys' display precision settings. NB a mixed amount can have an
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-- empty amounts list in which case it shows as \"\".
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showMixedAmountWithPrecision :: Int -> MixedAmount -> String
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showMixedAmountWithPrecision p m =
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vConcatRightAligned $ map (showAmountWithPrecision p) $ amounts $ normaliseMixedAmount m
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-- | Get an unambiguous string representation of a mixed amount for debugging.
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showMixedAmountDebug :: MixedAmount -> String
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showMixedAmountDebug m = printf "Mixed [%s]" as
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where as = intercalate "\n " $ map showAmountDebug $ amounts $ normaliseMixedAmount m
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-- | Get the string representation of a mixed amount, but without
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-- any \@ prices.
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showMixedAmountWithoutPrice :: MixedAmount -> String
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showMixedAmountWithoutPrice m = concat $ intersperse "\n" $ map showfixedwidth as
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where
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(Mixed as) = normaliseMixedAmount $ stripPrices m
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stripPrices (Mixed as) = Mixed $ map stripprice as where stripprice a = a{price=Nothing}
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width = maximum $ map (length . show) as
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showfixedwidth = printf (printf "%%%ds" width) . showAmountWithoutPrice
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-- | Get the string representation of a mixed amount, and if it
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-- appears to be all zero just show a bare 0, ledger-style.
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showMixedAmountOrZero :: MixedAmount -> String
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showMixedAmountOrZero a | a == missingamt = ""
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| isZeroMixedAmount a = "0"
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| otherwise = showMixedAmount a
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-- | Get the string representation of a mixed amount, or a bare 0,
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-- without any \@ prices.
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showMixedAmountOrZeroWithoutPrice :: MixedAmount -> String
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showMixedAmountOrZeroWithoutPrice a
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| isZeroMixedAmount a = "0"
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| otherwise = showMixedAmountWithoutPrice a
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-- | Replace a mixed amount's commodity with the canonicalised version from
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-- the provided commodity map.
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canonicaliseMixedAmountCommodity :: Maybe (Map.Map String Commodity) -> MixedAmount -> MixedAmount
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canonicaliseMixedAmountCommodity canonicalcommoditymap (Mixed as) = Mixed $ map (canonicaliseAmountCommodity canonicalcommoditymap) as
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-------------------------------------------------------------------------------
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-- misc
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tests_Hledger_Data_Amount = TestList [
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-- Amount
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"costOfAmount" ~: do
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costOfAmount (euros 1) `is` euros 1
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costOfAmount (euros 2){price=Just $ UnitPrice $ Mixed [dollars 2]} `is` dollars 4
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costOfAmount (euros 1){price=Just $ TotalPrice $ Mixed [dollars 2]} `is` dollars 2
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costOfAmount (euros (-1)){price=Just $ TotalPrice $ Mixed [dollars 2]} `is` dollars (-2)
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,"isZeroAmount" ~: do
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assertBool "" $ isZeroAmount $ Amount unknown 0 Nothing
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assertBool "" $ isZeroAmount $ dollars 0
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,"negating amounts" ~: do
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let a = dollars 1
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negate a `is` a{quantity=(-1)}
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let b = (dollars 1){price=Just $ UnitPrice $ Mixed [euros 2]}
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negate b `is` b{quantity=(-1)}
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,"adding amounts" ~: do
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let a1 = dollars 1.23
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let a2 = dollars (-1.23)
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let a3 = dollars (-1.23)
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(a1 + a2) `is` Amount (comm "$") 0 Nothing
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(a1 + a3) `is` Amount (comm "$") 0 Nothing
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(a2 + a3) `is` Amount (comm "$") (-2.46) Nothing
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(a3 + a3) `is` Amount (comm "$") (-2.46) Nothing
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sum [a1,a2,a3,-a3] `is` Amount (comm "$") 0 Nothing
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-- highest precision is preserved
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let ap1 = (dollars 1){commodity=dollar{precision=1}}
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ap3 = (dollars 1){commodity=dollar{precision=3}}
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(sum [ap1,ap3]) `is` ap3{quantity=2}
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(sum [ap3,ap1]) `is` ap3{quantity=2}
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-- adding different commodities assumes conversion rate 1
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assertBool "" $ isZeroAmount (a1 - euros 1.23)
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,"showAmount" ~: do
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showAmount (dollars 0 + pounds 0) `is` "0"
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-- MixedAmount
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,"normaliseMixedAmount" ~: do
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normaliseMixedAmount (Mixed []) `is` Mixed [nullamt]
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assertBool "" $ isZeroMixedAmount $ normaliseMixedAmount (Mixed [Amount {commodity=dollar, quantity=10, price=Nothing}
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,Amount {commodity=dollar, quantity=10, price=Just (TotalPrice (Mixed [Amount {commodity=euro, quantity=7, price=Nothing}]))}
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,Amount {commodity=dollar, quantity=(-10), price=Nothing}
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,Amount {commodity=dollar, quantity=(-10), price=Just (TotalPrice (Mixed [Amount {commodity=euro, quantity=7, price=Nothing}]))}
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])
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,"adding mixed amounts" ~: do
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let dollar0 = dollar{precision=0}
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(sum $ map (Mixed . (\a -> [a]))
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[Amount dollar 1.25 Nothing,
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Amount dollar0 (-1) Nothing,
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Amount dollar (-0.25) Nothing])
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`is` Mixed [Amount unknown 0 Nothing]
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,"showMixedAmount" ~: do
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showMixedAmount (Mixed [dollars 1]) `is` "$1.00"
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showMixedAmount (Mixed [(dollars 1){price=Just $ UnitPrice $ Mixed [euros 2]}]) `is` "$1.00 @ €2.00"
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showMixedAmount (Mixed [dollars 0]) `is` "0"
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showMixedAmount (Mixed []) `is` "0"
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showMixedAmount missingamt `is` ""
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,"showMixedAmountOrZero" ~: do
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showMixedAmountOrZero (Mixed [Amount dollar 0 Nothing]) `is` "0"
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showMixedAmountOrZero (Mixed []) `is` "0"
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showMixedAmountOrZero missingamt `is` ""
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,"showMixedAmountWithoutPrice" ~: do
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let a = (dollars 1){price=Just $ UnitPrice $ Mixed [euros 2]}
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showMixedAmountWithoutPrice (Mixed [a]) `is` "$1.00"
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showMixedAmountWithoutPrice (Mixed [a, (-a)]) `is` "0"
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]
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