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

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'use strict';

var safe = require('safe-regex');
var define = require('define-property');
var extend = require('extend-shallow');
var not = require('regex-not');
var MAX_LENGTH = 1024 * 64;

/**
 * Session cache
 */

var cache = {};

/**
 * Create a regular expression from the given `pattern` string.
 *
 * @param {String|RegExp} `pattern` Pattern can be a string or regular expression.
 * @param {Object} `options`
 * @return {RegExp}
 * @api public
 */

module.exports = function(patterns, options) {
  if (!Array.isArray(patterns)) {
    return makeRe(patterns, options);
  }
  return makeRe(patterns.join('|'), options);
};

/**
 * Create a regular expression from the given `pattern` string.
 *
 * @param {String|RegExp} `pattern` Pattern can be a string or regular expression.
 * @param {Object} `options`
 * @return {RegExp}
 * @api public
 */

function makeRe(pattern, options) {
  if (pattern instanceof RegExp) {
    return pattern;
  }

  if (typeof pattern !== 'string') {
    throw new TypeError('expected a string');
  }

  if (pattern.length > MAX_LENGTH) {
    throw new Error('expected pattern to be less than ' + MAX_LENGTH + ' characters');
  }

  var key = pattern;
  // do this before shallow cloning options, it's a lot faster
  if (!options || (options && options.cache !== false)) {
    key = createKey(pattern, options);

    if (cache.hasOwnProperty(key)) {
      return cache[key];
    }