opstack-kit-chains
Version:
Support your OP-Stack network with 'opstack-kit'
47 lines • 1.59 kB
JavaScript
/**
* Multiplies a string representation of a number by a given exponent of base 10 (10exponent).
*
* - Docs: https://viem.sh/docs/utilities/parseUnits
*
* @example
* import { parseUnits } from 'viem'
*
* parseUnits('420', 9)
* // 420000000000n
*/
export function parseUnits(value, decimals) {
let [integer, fraction = '0'] = value.split('.');
const negative = integer.startsWith('-');
if (negative)
integer = integer.slice(1);
// trim trailing zeros.
fraction = fraction.replace(/(0+)$/, '');
// round off if the fraction is larger than the number of decimals.
if (decimals === 0) {
if (Math.round(Number(`.${fraction}`)) === 1)
integer = `${BigInt(integer) + 1n}`;
fraction = '';
}
else if (fraction.length > decimals) {
const [left, unit, right] = [
fraction.slice(0, decimals - 1),
fraction.slice(decimals - 1, decimals),
fraction.slice(decimals),
];
const rounded = Math.round(Number(`${unit}.${right}`));
if (rounded > 9)
fraction = `${BigInt(left) + BigInt(1)}0`.padStart(left.length + 1, '0');
else
fraction = `${left}${rounded}`;
if (fraction.length > decimals) {
fraction = fraction.slice(1);
integer = `${BigInt(integer) + 1n}`;
}
fraction = fraction.slice(0, decimals);
}
else {
fraction = fraction.padEnd(decimals, '0');
}
return BigInt(`${negative ? '-' : ''}${integer}${fraction}`);
}
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