lazyload-js/test/node_modules/express/lib/router/route.js

An ancient tiny JS and CSS loader from the days before everyone had written one, Fork from @github/rgrove/lazyload

/*!
 * Express - router - Route
 * Copyright(c) 2010 TJ Holowaychuk <tj@vision-media.ca>
 * MIT Licensed
 */

/**
 * Expose `Route`.
 */

module.exports = Route;

/**
 * Initialize `Route` with the given HTTP `method`, `path`,
 * and callback `fn` and `options`.
 *
 * Options:
 *
 *   - `sensitive`   enable case-sensitive routes
 *
 * @param {String} method
 * @param {String} path
 * @param {Function} fn
 * @param {Object} options.
 * @api private
 */

function Route(method, path, fn, options) {
  options = options || {};
  this.callback = fn;
  this.path = path;
  this.regexp = normalize(path, this.keys = [], options.sensitive);
  this.method = method;
}

/**
 * Normalize the given path string,
 * returning a regular expression.
 *
 * An empty array should be passed,
 * which will contain the placeholder
 * key names. For example "/user/:id" will
 * then contain ["id"].
 *
 * @param  {String|RegExp} path
 * @param  {Array} keys
 * @param  {Boolean} sensitive
 * @return {RegExp}
 * @api private
 */

function normalize(path, keys, sensitive) {
  if (path instanceof RegExp) return path; 
  path = path
    .concat('/?')
    .replace(/\/\(/g, '(?:/')
    .replace(/(\/)?(\.)?:(\w+)(?:(\(.*?\)))?(\?)?/g, function(_, slash, format, key, capture, optional){
      keys.push(key);
      slash = slash || '';
      return ''
        + (optional ? '' : slash)
        + '(?:'
        + (optional ? slash : '')
        + (format || '') + (capture || '([^/]+?)') + ')'
        + (optional || '');
    })
    .replace(/([\/.])/g, '\\$1')
    .replace(/\*/g, '(.+)');
  return new RegExp('^' + path + '$', sensitive ? '' : 'i');
}