@spalger/kibana/src/ui/public/utils/range.js

Kibana is an open source (Apache Licensed), browser based analytics and search dashboard for Elasticsearch. Kibana is a snap to setup and start using. Kibana strives to be easy to get started with, while also being flexible and powerful, just like Elastic

define(function (require) {
  var _ = require('lodash');

  /**
   * Regexp portion that matches our number
   *
   * supports:
   *   -100
   *   -100.0
   *   0
   *   0.10
   *   Infinity
   *   -Infinity
   *
   * @type {String}
   */
  var _RE_NUMBER = '(\\-?(?:\\d+(?:\\.\\d+)?|Infinity))';

  /**
   * Regexp for the interval notation
   *
   * supports:
   *   [num, num]
   *   ( num , num ]
   *   [Infinity,num)
   *
   * @type {RegExp}
   */
  var RANGE_RE = new RegExp('^\\s*([\\[|\\(])\\s*' + _RE_NUMBER + '\\s*,\\s*' + _RE_NUMBER + '\\s*([\\]|\\)])\\s*$');

  function parse(input) {

    var match = String(input).match(RANGE_RE);
    if (!match) {
      throw new TypeError('expected input to be in interval notation eg. (100, 200]');
    }

    return new Range(
      match[1] === '[',
      parseFloat(match[2]),
      parseFloat(match[3]),
      match[4] === ']'
    );
  }

  function Range(/* minIncl, min, max, maxIncl */) {
    var args = _.toArray(arguments);
    if (args[1] > args[2]) args.reverse();

    this.minInclusive = args[0];
    this.min = args[1];
    this.max = args[2];
    this.maxInclusive = args[3];
  }

  Range.prototype.within = function (n) {
    if (this.min === n && !this.minInclusive) return false;
    if (this.min > n) return false;

    if (this.max === n && !this.maxInclusive) return false;
    if (this.max < n) return false;

    return true;
  };

  return parse;

});