mirror of
https://github.com/kremalicious/metamask-extension.git
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8527d051b0
utils.formatBalance was returning rounded ether, was not useful for displaying account balances. Now returns four decimal points, and is easily configurable for more, with passing tests. Spoiler alert: Don't you dare divide bignumber wei. Bignumber does not have decimals. Keep it as wei, format it as ether.
108 lines
2.6 KiB
JavaScript
108 lines
2.6 KiB
JavaScript
const ethUtil = require('ethereumjs-util')
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var valueTable = {
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wei: '1000000000000000000',
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kwei: '1000000000000000',
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mwei: '1000000000000',
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gwei: '1000000000',
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szabo: '1000000',
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finney:'1000',
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ether: '1',
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kether:'0.001',
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mether:'0.000001',
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gether:'0.000000001',
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tether:'0.000000000001',
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}
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var bnTable = {}
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for (var currency in valueTable) {
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bnTable[currency] = new ethUtil.BN(valueTable[currency], 10)
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}
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module.exports = {
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valuesFor: valuesFor,
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addressSummary: addressSummary,
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numericBalance: numericBalance,
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formatBalance: formatBalance,
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dataSize: dataSize,
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readableDate: readableDate,
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ethToWei: ethToWei,
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weiToEth: weiToEth,
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normalizeToWei: normalizeToWei,
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valueTable: valueTable,
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bnTable: bnTable,
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}
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function valuesFor(obj) {
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if (!obj) return []
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return Object.keys(obj)
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.map(function(key){ return obj[key] })
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}
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function addressSummary(address) {
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return address ? address.slice(0,2+8)+'...'+address.slice(-4) : '...'
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}
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// Takes wei Hex, returns wei BN, even if input is null
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function numericBalance(balance) {
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if (!balance) return new ethUtil.BN(0, 16)
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var stripped = ethUtil.stripHexPrefix(balance)
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return new ethUtil.BN(stripped, 16)
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}
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// Takes eth BN, returns BN wei
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function ethToWei(bn) {
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var eth = new ethUtil.BN('1000000000000000000')
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var wei = bn.mul(eth)
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return wei
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}
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// Takes BN in Wei, returns BN in eth
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function weiToEth(bn) {
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var diff = new ethUtil.BN('1000000000000000000')
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var eth = bn.div(diff)
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return eth
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}
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var decimalsToKeep = 4
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function formatBalance(balance) {
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if (!balance) return 'None'
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var wei = numericBalance(balance)
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var padded = wei.toString(10)
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var len = padded.length
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var nonZeroIndex = padded.match(/[^0]/).index
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var beforeDecimal = padded.substr(nonZeroIndex ? nonZeroIndex : 0, len - 18)
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var afterDecimal = padded.substr(len - 18, decimalsToKeep)
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return `${beforeDecimal}.${afterDecimal} ETH`
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}
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function dataSize(data) {
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var size = data ? ethUtil.stripHexPrefix(data).length : 0
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return size+' bytes'
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}
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// Takes a BN and an ethereum currency name,
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// returns a BN in wei
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function normalizeToWei(amount, currency) {
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try {
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var ether = amount.div(bnTable[currency])
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var wei = ether.mul(bnTable.wei)
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return wei
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} catch (e) {}
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return amount
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}
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function readableDate(ms) {
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var date = new Date(ms)
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var month = date.getMonth()
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var day = date.getDate()
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var year = date.getFullYear()
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var hours = date.getHours()
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var minutes = "0" + date.getMinutes()
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var seconds = "0" + date.getSeconds()
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var date = `${month}/${day}/${year}`
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var time = `${hours}:${minutes.substr(-2)}:${seconds.substr(-2)}`
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return `${date} ${time}`
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}
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