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fix: resolve exponential number #111

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Nov 7, 2021
Merged

fix: resolve exponential number #111

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36 changes: 30 additions & 6 deletions src/utils/web3.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -60,7 +60,27 @@ export function getContract(
*
*/

export function parseEther(ether: string) {
// See: node_modules/@ethersproject/bignumber/src.ts/fixednumber.ts
const WEI_UNIT = 18;
let zeros = '0';
while (zeros.length < WEI_UNIT) {
zeros += zeros;
}
// Returns a string "1" followed by decimal "0"s
function getMultiplier(decimals: ethers.BigNumberish): string {
if (typeof decimals !== 'number') {
try {
decimals = BigNumber.from(decimals).toNumber();
} catch (e) {}
}

if (typeof decimals !== 'number' || decimals < 0 || decimals > WEI_UNIT)
return '1';

return '1' + zeros.substring(0, decimals);
}

export function parseEther(ether: string): BigNumber {
if (ether.includes('e')) {
// Parse
const integerPart = ether.match(/^([0-9])+e/);
Expand All @@ -75,12 +95,16 @@ export function parseEther(ether: string) {
return BigNumber.from(0);
}

// resolve exponential number
const pow = !isNegative
? 18 + Number(exponentialPart[1])
: 18 - Number(exponentialPart[1]);
return BigNumber.from(integerPart[1]).pow(pow);
// Resolve exponential number
// Plus 18 to convert ETH to WEI
const pow = getMultiplier(
!isNegative
? Number(exponentialPart[1]) + 18
: -Number(exponentialPart[1]) + 18
);
return BigNumber.from(integerPart[1]).mul(pow);
}

return ethers.utils.parseEther(ether);
}

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