Acme.BookStore.HttpApi.Host/node_modules/to-regex-range/index.js

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/*!
 * to-regex-range <https://github.com/jonschlinkert/to-regex-range>
 *
 * Copyright (c) 2015, 2017, Jon Schlinkert.
 * Released under the MIT License.
 */

'use strict';

var repeat = require('repeat-string');
var isNumber = require('is-number');
var cache = {};

function toRegexRange(min, max, options) {
  if (isNumber(min) === false) {
    throw new RangeError('toRegexRange: first argument is invalid.');
  }

  if (typeof max === 'undefined' || min === max) {
    return String(min);
  }

  if (isNumber(max) === false) {
    throw new RangeError('toRegexRange: second argument is invalid.');
  }

  options = options || {};
  var relax = String(options.relaxZeros);
  var shorthand = String(options.shorthand);
  var capture = String(options.capture);
  var key = min + ':' + max + '=' + relax + shorthand + capture;
  if (cache.hasOwnProperty(key)) {
    return cache[key].result;
  }

  var a = Math.min(min, max);
  var b = Math.max(min, max);

  if (Math.abs(a - b) === 1) {
    var result = min + '|' + max;
    if (options.capture) {
      return '(' + result + ')';
    }
    return result;
  }

  var isPadded = padding(min) || padding(max);
  var positives = [];
  var negatives = [];

  var tok = {min: min, max: max, a: a, b: b};
  if (isPadded) {
    tok.isPadded = isPadded;
    tok.maxLen = String(tok.max).length;
  }

  if (a < 0) {
    var newMin = b < 0 ? Math.abs(b) : 1;
    var newMax = Math.abs(a);
    negatives = splitToPatterns(newMin, newMax, tok, options);