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feat: calcTotalPrice calcPrice calcUnits with bigint
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,28 @@ | ||
| import { expect, test } from 'vitest' | ||
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| import { calcPrice, calcTotalPrice, calcUnits } from './price' | ||
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| test('calculate unit price from units and total price', () => { | ||
| expect(calcPrice(BigInt(2e6), BigInt(1e5), 6, 6)).toMatchInlineSnapshot('50000n') | ||
| expect(calcPrice(BigInt(100e18), BigInt(1e5), 18, 6)).toMatchInlineSnapshot('1000n') | ||
| expect(calcPrice(BigInt(-123e26), BigInt(1e5), 26, 6)).toMatchInlineSnapshot('813n') | ||
| expect(calcPrice(BigInt(-100e18), BigInt(1e5), 18, 6, true)).toMatchInlineSnapshot('-1000n') | ||
| }) | ||
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| test('calculate units from unit price and total price', () => { | ||
| expect(calcUnits(BigInt(1e5), BigInt(2e6))).toMatchInlineSnapshot('50000000000000000n') | ||
| expect(calcUnits('723400000', '2124000000', 6, 8)).toMatchInlineSnapshot('34058380n') | ||
| expect(calcUnits(BigInt(723400000e6), BigInt(21240000e6), 36, 18)).toMatchInlineSnapshot('34058380414312617702n') | ||
| expect(calcUnits('100000000', '1000000')).toMatchInlineSnapshot('100000000000000000000n') | ||
| expect(calcUnits('1000', '1200', 2, 2)).toMatchInlineSnapshot('83n') | ||
| }) | ||
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| test('calculate total price from units and unit price', () => { | ||
| expect(calcTotalPrice('100', '12', 2, 2)).toMatchInlineSnapshot('12n') | ||
| expect(calcTotalPrice(BigInt(2223e17), '12', 18, 1)).toMatchInlineSnapshot('2667n') | ||
| expect(calcTotalPrice(BigInt(2223e17), '1200000', 18, 6)).toMatchInlineSnapshot('266760000n') | ||
| expect(calcTotalPrice(BigInt(2223e17), '12000000', 18, 6)).toMatchInlineSnapshot('2667600000n') | ||
| expect(calcTotalPrice(BigInt(20e9), BigInt(2e6), 9, 6)).toMatchInlineSnapshot('40000000n') | ||
| expect(calcTotalPrice('20', '2', 0, 0)).toMatchInlineSnapshot('40n') | ||
| expect(calcTotalPrice('20', '2', 1, 0)).toMatchInlineSnapshot('4n') | ||
| }) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| import { absBig } from './bigUtils' | ||
| import { scale } from './scale' | ||
| import { unScaleToBase } from './unscale' | ||
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| const precisionCatalyst = 6 // to avoid loss of precision if the given decimals are not enough | ||
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| /** | ||
| * Calculates the unit price based on the number of units and total price. | ||
| * @param noAbs pass `true` to allow -ve values for resulted unit price | ||
| * @example | ||
| * calcPrice(BigInt(2e6), BigInt(1e5), 6, 6) // 50000n | ||
| */ | ||
| export function calcPrice( | ||
| units: string | bigint, totalPrice: string | bigint, unitDecimals = 18, priceDecimals = 6, noAbs = false, | ||
| ) { | ||
| if (!noAbs) // due to nature of the exchange, we need to support negative values for units and return +ve unit price | ||
| units = absBig(units) | ||
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| // to avoid underflow and retain precision | ||
| const priceDecimalsFactor = priceDecimals + priceDecimals + unitDecimals + precisionCatalyst | ||
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| return unScaleToBase( | ||
| scale(totalPrice.toString(), priceDecimalsFactor) / BigInt(units), | ||
| priceDecimalsFactor, | ||
| unitDecimals, | ||
| ) | ||
| } | ||
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| /** | ||
| * Calculates units based on the total price and number of units. | ||
| * @example | ||
| * calcUnits(BigInt(1e5), BigInt(2e6)) // 50000000000000000n | ||
| * calcUnits('1000', '1200', 2, 2) // 83n === 0.83 * 10^2 | ||
| */ | ||
| export function calcUnits( | ||
| totalPrice: string | bigint, unitPrice: string | bigint, priceDecimals = 6, unitDecimals = 18, | ||
| ) { | ||
| const priceDecimalsFactor = priceDecimals + priceDecimals + unitDecimals + precisionCatalyst | ||
| return unScaleToBase( | ||
| scale(totalPrice.toString(), priceDecimalsFactor) / BigInt(unitPrice), | ||
| priceDecimalsFactor, | ||
| unitDecimals, | ||
| ) | ||
| } | ||
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| /** | ||
| * Calculates the total price based on the number of units and unit price. | ||
| * @param noAbs pass `true` to allow -ve values for resulted total price | ||
| * @example | ||
| * calcTotalPrice('100', '12', 2, 2) // 12n | ||
| * BigInt(2223e17), '12000000', 18, 6) // 2667600000n | ||
| */ | ||
| export function calcTotalPrice( | ||
| units: string | bigint, unitPrice: string | bigint, unitDecimals = 18, priceDecimals = 6, noAbs = false, | ||
| ) { | ||
| if (!noAbs) // due to nature of the exchange, we need to support negative values for units and return +ve total price | ||
| units = absBig(units) | ||
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| return unScaleToBase( | ||
| BigInt(units) * BigInt(unitPrice), | ||
| unitDecimals + priceDecimals, | ||
| priceDecimals, | ||
| ) | ||
| } |
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