tornado-packages/ethers.js
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Added ether string parsing and formatting.

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This commit is contained in:
ricmoo 2016-07-29 20:06:58 -04:00
parent f71ea72d54
commit 5e421d2636
2 changed files with 118 additions and 0 deletions
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63
lib/wallet.js
View File

@ -86,5 +86,68 @@ utils.defineProperty(Wallet, 'getIcapAddress', SigningKey.getIcapAddress);
utils.defineProperty(Wallet, '_Contract', Contract); utils.defineProperty(Wallet, '_Contract', Contract);
var zero = new utils.BN(0);
var negative1 = new utils.BN(-1);
var tenPower18 = new utils.BN('1000000000000000000');
utils.defineProperty(Wallet, 'formatEther', function(wei, options) {
if (typeof(wei) === 'number') { wei = new utils.BN(wei); }
if (!options) { options = {}; }
if (!(wei instanceof utils.BN)) { throw new Error('invalid wei'); }
var negative = wei.lt(zero);
if (negative) { wei = wei.mul(negative1); }
var fraction = wei.mod(tenPower18).toString(10);
while (fraction.length < 18) { fraction = '0' + fraction; }
if (!options.pad) {
fraction = fraction.match(/^([0-9]*[1-9]|0)(0*)/)[1];
}
var whole = wei.div(tenPower18).toString(10);
if (options.commify) {
whole = whole.replace(/\B(?=(\d{3})+(?!\d))/g, ",")
}
var value = whole + '.' + fraction;
if (negative) { value = '-' + value; }
return value;
});
utils.defineProperty(Wallet, 'parseEther', function(ether) {
if (typeof(ether) !== 'string' || !ether.match(/^-?[0-9.]+$/)) {
throw new Error('invalid value');
}
// Is it negative?
var negative = (ether.substring(0, 1) === '-');
if (negative) { ether = ether.substring(1); }
if (ether === '.') { throw new Error('invalid value'); }
// Split it into a whole and fractional part
var comps = ether.split('.');
if (comps.length > 2) { throw new Error('too many decimal points'); }
var whole = comps[0], fraction = comps[1];
if (!whole) { whole = '0'; }
if (!fraction) { fraction = '0'; }
if (fraction.length > 18) { throw new Error('too many decimal places'); }
while (fraction.length < 18) { fraction += '0'; }
whole = new utils.BN(whole);
fraction = new utils.BN(fraction);
var wei = (whole.mul(tenPower18)).add(fraction);
if (negative) { wei = wei.mul(negative1); }
return wei;
});
module.exports = Wallet; module.exports = Wallet;

55
tests/test-ether-format.js Normal file
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@ -0,0 +1,55 @@
'use strict';
var Wallet = require('../index.js');
var BN = Wallet.utils.BN;
module.exports = function(test) {
function checkFormat(wei, targetEther, options) {
var ether = Wallet.formatEther(wei, options);
//console.log(wei, targetEther, options, ether);
test.equal(ether, targetEther, 'Failed to match formatted ether');
ether = ether.replace(/,/g, '');
test.ok(Wallet.parseEther(ether).eq(wei), 'Failed to convert back to wei');
}
function checkParse(ether, targetWei) {
//console.log(ether, targetWei, Wallet.parseEther(ether));
test.ok(targetWei.eq(Wallet.parseEther(ether)), 'Failed to match target wei');
}
checkParse('123.012345678901234567', new BN('123012345678901234567'));
checkParse('1.0', new BN('1000000000000000000'));
checkParse('1', new BN('1000000000000000000'));
checkParse('1.00', new BN('1000000000000000000'));
checkParse('01.0', new BN('1000000000000000000'));
checkParse('-1.0', new BN('-1000000000000000000'));
checkParse('0.1', new BN('100000000000000000'));
checkParse('.1', new BN('100000000000000000'));
checkParse('0.10', new BN('100000000000000000'));
checkParse('.100', new BN('100000000000000000'));
checkParse('00.100', new BN('100000000000000000'));
checkParse('-0.1', new BN('-100000000000000000'));
checkFormat(new BN('10000000000000000'), '0.01');
checkFormat(new BN('1000000000000000000'), '1.0');
checkFormat(new BN('1230000000000000000'), '1.23');
checkFormat(new BN('-1230000000000000000'), '-1.23');
checkFormat(new BN('1000000000000000000'), '1.000000000000000000', {pad: true});
checkFormat(new BN('123000000000000000000'), '123.000000000000000000', {pad: true});
checkFormat(new BN('1230000000000000000'), '1.230000000000000000', {pad: true});
checkFormat(new BN('-1230000000000000000'), '-1.230000000000000000', {pad: true});
checkFormat(new BN('1234567890000000000000000'), '1,234,567.89', {pad: false, commify: true});
checkFormat(new BN('1234567890000000000000000'), '1,234,567.890000000000000000', {pad: true, commify: true});
checkFormat(new BN('-1234567890000000000000000'), '-1,234,567.89', {pad: false, commify: true});
test.done();
}