79 lines
2.0 KiB
JavaScript
79 lines
2.0 KiB
JavaScript
var utils = require('./utils.js');
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var zero = new utils.BN(0);
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var negative1 = new utils.BN(-1);
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var tenPower18 = new utils.BN('1000000000000000000');
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function formatEther(wei, options) {
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if (typeof(wei) === 'number') {
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// @TODO: Warn if truncation will occur?
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wei = new utils.BN(wei);
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} else if (utils.isHexString(wei)) {
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wei = new utils.BN(wei.substring(2), 16);
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}
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if (!options) { options = {}; }
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if (!(wei instanceof utils.BN)) { throw new Error('invalid wei'); }
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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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throw new Error('invalid value');
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}
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// Is it negative?
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var negative = (ether.substring(0, 1) === '-');
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if (negative) { ether = ether.substring(1); }
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if (ether === '.') { throw new Error('invalid value'); }
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// Split it into a whole and fractional part
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var comps = ether.split('.');
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if (comps.length > 2) { throw new Error('too many decimal points'); }
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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) { throw new Error('too many decimal places'); }
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while (fraction.length < 18) { fraction += '0'; }
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whole = new utils.BN(whole);
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fraction = new utils.BN(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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