Sun calculation js library which is fully based on formula from http://aa.quae.nl/en/reken/zonpositie.html
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109 lines
2.0 KiB
109 lines
2.0 KiB
/**
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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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* @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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if ('string' == typeof val) return parse(val);
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return options['long'] ? longFormat(val) : shortFormat(val);
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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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var match = /^((?:\d+)?\.?\d+) *(ms|seconds?|s|minutes?|m|hours?|h|days?|d|years?|y)?$/i.exec(str);
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if (!match) return;
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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 '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 '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 '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 's':
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return n * s;
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case 'ms':
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return n;
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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 shortFormat(ms) {
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if (ms >= d) return Math.round(ms / d) + 'd';
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if (ms >= h) return Math.round(ms / h) + 'h';
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if (ms >= m) return Math.round(ms / m) + 'm';
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if (ms >= s) return Math.round(ms / s) + 's';
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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 longFormat(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) return;
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if (ms < n * 1.5) return Math.floor(ms / n) + ' ' + name;
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return Math.ceil(ms / n) + ' ' + name + 's';
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}
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