opusdev/vector-similarity-api

1/**2 * Helpers.3 */4 5var s = 1000;6var m = s * 60;7var h = m * 60;8var d = h * 24;9var y = d * 365.25;10 11/**12 * Parse or format the given `val`.13 *14 * Options:15 *16 *  - `long` verbose formatting [false]17 *18 * @param {String|Number} val19 * @param {Object} [options]20 * @throws {Error} throw an error if val is not a non-empty string or a number21 * @return {String|Number}22 * @api public23 */24 25module.exports = function(val, options) {26  options = options || {};27  var type = typeof val;28  if (type === 'string' && val.length > 0) {29    return parse(val);30  } else if (type === 'number' && isNaN(val) === false) {31    return options.long ? fmtLong(val) : fmtShort(val);32  }33  throw new Error(34    'val is not a non-empty string or a valid number. val=' +35      JSON.stringify(val)36  );37};38 39/**40 * Parse the given `str` and return milliseconds.41 *42 * @param {String} str43 * @return {Number}44 * @api private45 */46 47function parse(str) {48  str = String(str);49  if (str.length > 100) {50    return;51  }52  var match = /^((?:\d+)?\.?\d+) *(milliseconds?|msecs?|ms|seconds?|secs?|s|minutes?|mins?|m|hours?|hrs?|h|days?|d|years?|yrs?|y)?$/i.exec(53    str54  );55  if (!match) {56    return;57  }58  var n = parseFloat(match[1]);59  var type = (match[2] || 'ms').toLowerCase();60  switch (type) {61    case 'years':62    case 'year':63    case 'yrs':64    case 'yr':65    case 'y':66      return n * y;67    case 'days':68    case 'day':69    case 'd':70      return n * d;71    case 'hours':72    case 'hour':73    case 'hrs':74    case 'hr':75    case 'h':76      return n * h;77    case 'minutes':78    case 'minute':79    case 'mins':80    case 'min':81    case 'm':82      return n * m;83    case 'seconds':84    case 'second':85    case 'secs':86    case 'sec':87    case 's':88      return n * s;89    case 'milliseconds':90    case 'millisecond':91    case 'msecs':92    case 'msec':93    case 'ms':94      return n;95    default:96      return undefined;97  }98}99 100/**101 * Short format for `ms`.102 *103 * @param {Number} ms104 * @return {String}105 * @api private106 */107 108function fmtShort(ms) {109  if (ms >= d) {110    return Math.round(ms / d) + 'd';111  }112  if (ms >= h) {113    return Math.round(ms / h) + 'h';114  }115  if (ms >= m) {116    return Math.round(ms / m) + 'm';117  }118  if (ms >= s) {119    return Math.round(ms / s) + 's';120  }121  return ms + 'ms';122}123 124/**125 * Long format for `ms`.126 *127 * @param {Number} ms128 * @return {String}129 * @api private130 */131 132function fmtLong(ms) {133  return plural(ms, d, 'day') ||134    plural(ms, h, 'hour') ||135    plural(ms, m, 'minute') ||136    plural(ms, s, 'second') ||137    ms + ' ms';138}139 140/**141 * Pluralization helper.142 */143 144function plural(ms, n, name) {145  if (ms < n) {146    return;147  }148  if (ms < n * 1.5) {149    return Math.floor(ms / n) + ' ' + name;150  }151  return Math.ceil(ms / n) + ' ' + name + 's';152}153