74 lines
2.0 KiB
JavaScript
74 lines
2.0 KiB
JavaScript
var bigNumberify = require('./bignumber.js').bigNumberify;
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var throwError = require('./throw-error');
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var zero = new bigNumberify(0);
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var negative1 = new bigNumberify(-1);
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var tenPower18 = new bigNumberify('1000000000000000000');
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function formatEther(wei, options) {
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wei = bigNumberify(wei);
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if (!options) { options = {}; }
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var negative = wei.lt(zero);
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if (negative) { wei = wei.mul(negative1); }
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var fraction = wei.mod(tenPower18).toString(10);
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while (fraction.length < 18) { fraction = '0' + fraction; }
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if (!options.pad) {
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fraction = fraction.match(/^([0-9]*[1-9]|0)(0*)/)[1];
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}
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var whole = wei.div(tenPower18).toString(10);
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if (options.commify) {
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whole = whole.replace(/\B(?=(\d{3})+(?!\d))/g, ",")
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}
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var value = whole + '.' + fraction;
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if (negative) { value = '-' + value; }
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return value;
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}
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function parseEther(ether) {
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if (typeof(ether) !== 'string' || !ether.match(/^-?[0-9.,]+$/)) {
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throwError('invalid value', { input: ether });
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}
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var value = ether.replace(/,/g,'');
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// Is it negative?
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var negative = (value.substring(0, 1) === '-');
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if (negative) { value = value.substring(1); }
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if (value === '.') { throwError('invalid value', { input: ether }); }
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// Split it into a whole and fractional part
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var comps = value.split('.');
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if (comps.length > 2) { throwError('too many decimal points', { input: ether }); }
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var whole = comps[0], fraction = comps[1];
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if (!whole) { whole = '0'; }
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if (!fraction) { fraction = '0'; }
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if (fraction.length > 18) { throwError('too many decimal places', { input: ether, decimals: fraction.length }); }
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while (fraction.length < 18) { fraction += '0'; }
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whole = bigNumberify(whole);
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fraction = bigNumberify(fraction);
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var wei = (whole.mul(tenPower18)).add(fraction);
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if (negative) { wei = wei.mul(negative1); }
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return wei;
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}
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module.exports = {
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formatEther: formatEther,
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parseEther: parseEther,
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}
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