viem/_cjs/utils/unit/parseUnits.js

TypeScript Interface for Ethereum

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.parseUnits = parseUnits;
const unit_js_1 = require("../../errors/unit.js");
function parseUnits(value, decimals) {
    if (!/^(-?)([0-9]*)\.?([0-9]*)$/.test(value))
        throw new unit_js_1.InvalidDecimalNumberError({ value });
    let [integer, fraction = '0'] = value.split('.');
    const negative = integer.startsWith('-');
    if (negative)
        integer = integer.slice(1);
    fraction = fraction.replace(/(0+)$/, '');
    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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