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/*!
 * parseurl
 * Copyright(c) 2014 Jonathan Ong
 * Copyright(c) 2014 Douglas Christopher Wilson
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var url = require('url')
var parse = url.parse
var Url = url.Url

/**
 * Pattern for a simple path case.
 * See: https://github.com/joyent/node/pull/7878
 */

var simplePathRegExp = /^(\/\/?(?!\/)[^\?#\s]*)(\?[^#\s]*)?$/

/**
 * Exports.
 */

module.exports = parseurl
module.exports.original = originalurl

/**
 * Parse the `req` url with memoization.
 *
 * @param {ServerRequest} req
 * @return {Object}
 * @api public
 */

function parseurl(req) {
  var url = req.url

  if (url === undefined) {
    // URL is undefined
    return undefined
  }

  var parsed = req._parsedUrl

  if (fresh(url, parsed)) {
    // Return cached URL parse
    return parsed
  }

  // Parse the URL
  parsed = fastparse(url)
  parsed._raw = url

  return req._parsedUrl = parsed
};

/**
 * Parse the `req` original url with fallback and memoization.
 *
 * @param {ServerRequest} req
 * @return {Object}
 * @api public
 */

function originalurl(req) {
  var url = req.originalUrl

  if (typeof url !== 'string') {
    // Fallback
    return parseurl(req)
  }

  var parsed = req._parsedOriginalUrl

  if (fresh(url, parsed)) {
    // Return cached URL parse
    return parsed
  }

  // Parse the URL
  parsed = fastparse(url)
  parsed._raw = url

  return req._parsedOriginalUrl = parsed
};

/**
 * Parse the `str` url with fast-path short-cut.
 *
 * @param {string} str
 * @return {Object}
 * @api private
 */

function fastparse(str) {
  // Try fast path regexp
  // See: https://github.com/joyent/node/pull/7878
  var simplePath = typeof str === 'string' && simplePathRegExp.exec(str)

  // Construct simple URL
  if (simplePath) {
    var pathname = simplePath[1]
    var search = simplePath[2] || null
    var url = Url !== undefined
      ? new Url()
      : {}
    url.path = str
    url.href = str
    url.pathname = pathname
    url.search = search
    url.query = search && search.substr(1)

    return url
  }

  return parse(str)
}

/**
 * Determine if parsed is still fresh for url.
 *
 * @param {string} url
 * @param {object} parsedUrl
 * @return {boolean}
 * @api private
 */

function fresh(url, parsedUrl) {
  return typeof parsedUrl === 'object'
    && parsedUrl !== null
    && (Url === undefined || parsedUrl instanceof Url)
    && parsedUrl._raw === url
}