153 lines
2.7 KiB
JavaScript
153 lines
2.7 KiB
JavaScript
/**
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* Helpers.
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*/
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var s = 1000;
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var m = s * 60;
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var h = m * 60;
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var d = h * 24;
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var y = d * 365.25;
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/**
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* Parse or format the given `val`.
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*
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* Options:
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*
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* - `long` verbose formatting [false]
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*
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* @param {String|Number} val
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* @param {Object} [options]
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* @throws {Error} throw an error if val is not a non-empty string or a number
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* @return {String|Number}
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* @api public
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*/
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module.exports = function(val, options) {
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options = options || {};
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var type = typeof val;
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if (type === 'string' && val.length > 0) {
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return parse(val);
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} else if (type === 'number' && isNaN(val) === false) {
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return options.long ? fmtLong(val) : fmtShort(val);
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}
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throw new Error(
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'val is not a non-empty string or a valid number. val=' +
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JSON.stringify(val)
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);
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};
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/**
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* Parse the given `str` and return milliseconds.
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*
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* @param {String} str
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* @return {Number}
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* @api private
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*/
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function parse(str) {
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str = String(str);
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if (str.length > 100) {
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return;
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}
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var match = /^((?:\d+)?\.?\d+) *(milliseconds?|msecs?|ms|seconds?|secs?|s|minutes?|mins?|m|hours?|hrs?|h|days?|d|years?|yrs?|y)?$/i.exec(
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str
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);
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if (!match) {
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return;
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}
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var n = parseFloat(match[1]);
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var type = (match[2] || 'ms').toLowerCase();
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switch (type) {
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case 'years':
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case 'year':
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case 'yrs':
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case 'yr':
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case 'y':
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return n * y;
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case 'days':
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case 'day':
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case 'd':
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return n * d;
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case 'hours':
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case 'hour':
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case 'hrs':
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case 'hr':
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case 'h':
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return n * h;
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case 'minutes':
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case 'minute':
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case 'mins':
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case 'min':
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case 'm':
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return n * m;
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case 'seconds':
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case 'second':
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case 'secs':
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case 'sec':
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case 's':
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return n * s;
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case 'milliseconds':
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case 'millisecond':
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case 'msecs':
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case 'msec':
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case 'ms':
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return n;
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default:
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return undefined;
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}
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}
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/**
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* Short format for `ms`.
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*
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* @param {Number} ms
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* @return {String}
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* @api private
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*/
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function fmtShort(ms) {
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if (ms >= d) {
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return Math.round(ms / d) + 'd';
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}
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if (ms >= h) {
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return Math.round(ms / h) + 'h';
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}
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if (ms >= m) {
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return Math.round(ms / m) + 'm';
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}
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if (ms >= s) {
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return Math.round(ms / s) + 's';
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}
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return ms + 'ms';
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}
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/**
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* Long format for `ms`.
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*
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* @param {Number} ms
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* @return {String}
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* @api private
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*/
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function fmtLong(ms) {
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return plural(ms, d, 'day') ||
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plural(ms, h, 'hour') ||
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plural(ms, m, 'minute') ||
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plural(ms, s, 'second') ||
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ms + ' ms';
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}
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/**
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* Pluralization helper.
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*/
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function plural(ms, n, name) {
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if (ms < n) {
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return;
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}
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if (ms < n * 1.5) {
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return Math.floor(ms / n) + ' ' + name;
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}
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return Math.ceil(ms / n) + ' ' + name + 's';
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}
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