MyCrypto/common/utils/formatters.ts

122 lines
3.6 KiB
TypeScript

import BN from 'bn.js';
import { Wei } from 'libs/units';
import { stripHexPrefix } from 'libs/values';
export function toFixedIfLarger(num: number, fixedSize: number = 6): string {
return parseFloat(num.toFixed(fixedSize)).toString();
}
export function combineAndUpper(...args: string[]) {
return args.reduce((acc, item) => acc.concat(item.toUpperCase()), '');
}
const toFixed = (num: string, digits: number = 3) => {
const [integerPart, fractionPart = ''] = num.split('.');
if (fractionPart.length === digits) {
return num;
}
if (fractionPart.length < digits) {
return `${integerPart}.${fractionPart.padEnd(digits, '0')}`;
}
let decimalPoint = integerPart.length;
const formattedFraction = fractionPart.slice(0, digits);
const integerArr = `${integerPart}${formattedFraction}`.split('').map(str => +str);
let carryOver = Math.floor((+fractionPart[digits] + 5) / 10);
// grade school addition / rounding
for (let i = integerArr.length - 1; i >= 0; i--) {
const currVal = integerArr[i] + carryOver;
const newVal = currVal % 10;
carryOver = Math.floor(currVal / 10);
integerArr[i] = newVal;
if (i === 0 && carryOver > 0) {
integerArr.unshift(0);
decimalPoint++;
i++;
}
}
const strArr = integerArr.map(n => n.toString());
strArr.splice(decimalPoint, 0, '.');
if (strArr[strArr.length - 1] === '.') {
strArr.pop();
}
return strArr.join('');
};
// Use in place of angular number filter
export function formatNumber(num: string, digits?: number): string {
const parts = toFixed(num, digits).split('.');
// Remove trailing zeroes on decimal (If there is a decimal)
if (parts[1]) {
parts[1] = parts[1].replace(/0+$/, '');
// If there's nothing left, remove decimal altogether
if (!parts[1]) {
parts.pop();
}
}
// Commafy the whole numbers
parts[0] = parts[0].replace(/\B(?=(\d{3})+(?!\d))/g, ',');
return parts.join('.');
}
// TODO: Comment up this function to make it clear what's happening here.
export function formatGasLimit(limit: Wei, transactionUnit: string = 'ether') {
let limitStr = limit.toString();
// I'm guessing this is some known off-by-one-error from the node?
// 21k is only the limit for ethereum though, so make sure they're
// sending ether if we're going to fix it for them.
if (limitStr === '21001' && transactionUnit === 'ether') {
limitStr = '21000';
}
// If they've exceeded the gas limit per block, make it -1
// TODO: Explain why not cap at limit?
// TODO: Make this dynamic, potentially. Would require promisifying this fn.
// TODO: Figure out if this is only true for ether. Do other currencies have
// this limit?
if (limit.gten(4000000)) {
limitStr = '-1';
}
return limitStr;
}
// Regex modified from this stackoverflow answer
// https://stackoverflow.com/a/10805198, with the comma character added as a
// delimiter (in the case of csv style mnemonic phrases) as well as any stray
// space characters. it should be fairly easy to add new delimiters as required
export function formatMnemonic(phrase: string) {
return phrase.replace(/(\r\n|\n|\r|\s+|,)/gm, ' ').trim();
}
export function bytesToHuman(bytes: number) {
if (bytes <= 0) {
return '0 b';
}
const sizes = ['b', 'kb', 'mb', 'gb', 'tb'];
const i = Math.round(Math.floor(Math.log(bytes) / Math.log(1024)));
return Math.round(bytes / Math.pow(1024, i)) + ' ' + sizes[i];
}
export function ensV3Url(name: string) {
return `https://mycrypto.com/?ensname=${name}#ens`;
}
export function hexToNumber(hex: string) {
return new BN(stripHexPrefix(hex)).toNumber();
}