JAVASCRIPT 28
Url.js Guest on 4th May 2021 07:55:07 AM
  1. // Copyright Joyent, Inc. and other Node contributors.
  2. //
  3. // Permission is hereby granted, free of charge, to any person obtaining a
  4. // copy of this software and associated documentation files (the
  5. // "Software"), to deal in the Software without restriction, including
  6. // without limitation the rights to use, copy, modify, merge, publish,
  7. // distribute, sublicense, and/or sell copies of the Software, and to permit
  8. // persons to whom the Software is furnished to do so, subject to the
  9. // following conditions:
  10. //
  11. // The above copyright notice and this permission notice shall be included
  12. // in all copies or substantial portions of the Software.
  13. //
  14. // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  15. // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  16. // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
  17. // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  18. // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  19. // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  20. // USE OR OTHER DEALINGS IN THE SOFTWARE.
  21.  
  22. 'use strict';
  23.  
  24. var punycode = require('punycode');
  25. var util = require('./util');
  26.  
  27. exports.parse = urlParse;
  28. exports.resolve = urlResolve;
  29. exports.resolveObject = urlResolveObject;
  30. exports.format = urlFormat;
  31.  
  32. exports.Url = Url;
  33.  
  34. function Url() {
  35.   this.protocol = null;
  36.   this.slashes = null;
  37.   this.auth = null;
  38.   this.host = null;
  39.   this.port = null;
  40.   this.hostname = null;
  41.   this.hash = null;
  42.   this.search = null;
  43.   this.query = null;
  44.   this.pathname = null;
  45.   this.path = null;
  46.   this.href = null;
  47. }
  48.  
  49. // Reference: RFC 3986, RFC 1808, RFC 2396
  50.  
  51. // define these here so at least they only have to be
  52. // compiled once on the first module load.
  53. var protocolPattern = /^([a-z0-9.+-]+:)/i,
  54.     portPattern = /:[0-9]*$/,
  55.  
  56.     // Special case for a simple path URL
  57.     simplePathPattern = /^(\/\/?(?!\/)[^\?\s]*)(\?[^\s]*)?$/,
  58.  
  59.     // RFC 2396: characters reserved for delimiting URLs.
  60.     // We actually just auto-escape these.
  61.     delims = ['<', '>', '"', '`', ' ', '\r', '\n', '\t'],
  62.  
  63.     // RFC 2396: characters not allowed for various reasons.
  64.     unwise = ['{', '}', '|', '\\', '^', '`'].concat(delims),
  65.  
  66.     // Allowed by RFCs, but cause of XSS attacks.  Always escape these.
  67.     autoEscape = ['\''].concat(unwise),
  68.     // Characters that are never ever allowed in a hostname.
  69.     // Note that any invalid chars are also handled, but these
  70.     // are the ones that are *expected* to be seen, so we fast-path
  71.     // them.
  72.     nonHostChars = ['%', '/', '?', ';', '#'].concat(autoEscape),
  73.     hostEndingChars = ['/', '?', '#'],
  74.     hostnameMaxLen = 255,
  75.     hostnamePartPattern = /^[+a-z0-9A-Z_-]{0,63}$/,
  76.     hostnamePartStart = /^([+a-z0-9A-Z_-]{0,63})(.*)$/,
  77.     // protocols that can allow "unsafe" and "unwise" chars.
  78.     unsafeProtocol = {
  79.       'javascript': true,
  80.       'javascript:': true
  81.     },
  82.     // protocols that never have a hostname.
  83.     hostlessProtocol = {
  84.       'javascript': true,
  85.       'javascript:': true
  86.     },
  87.     // protocols that always contain a // bit.
  88.     slashedProtocol = {
  89.       'http': true,
  90.       'https': true,
  91.       'ftp': true,
  92.       'gopher': true,
  93.       'file': true,
  94.       'http:': true,
  95.       'https:': true,
  96.       'ftp:': true,
  97.       'gopher:': true,
  98.       'file:': true
  99.     },
  100.     querystring = require('querystring');
  101.  
  102. function urlParse(url, parseQueryString, slashesDenoteHost) {
  103.   if (url && util.isObject(url) && url instanceof Url) return url;
  104.  
  105.   var u = new Url;
  106.   u.parse(url, parseQueryString, slashesDenoteHost);
  107.   return u;
  108. }
  109.  
  110. Url.prototype.parse = function(url, parseQueryString, slashesDenoteHost) {
  111.   if (!util.isString(url)) {
  112.     throw new TypeError("Parameter 'url' must be a string, not " + typeof url);
  113.   }
  114.  
  115.   // Copy chrome, IE, opera backslash-handling behavior.
  116.   // Back slashes before the query string get converted to forward slashes
  117.   // See: https://code.google.com/p/chromium/issues/detail?id=25916
  118.   var queryIndex = url.indexOf('?'),
  119.       splitter =
  120.           (queryIndex !== -1 && queryIndex < url.indexOf('#')) ? '?' : '#',
  121.       uSplit = url.split(splitter),
  122.       slashRegex = /\\/g;
  123.   uSplit[0] = uSplit[0].replace(slashRegex, '/');
  124.   url = uSplit.join(splitter);
  125.  
  126.   var rest = url;
  127.  
  128.   // trim before proceeding.
  129.   // This is to support parse stuff like "  http://foo.com  \n"
  130.   rest = rest.trim();
  131.  
  132.   if (!slashesDenoteHost && url.split('#').length === 1) {
  133.     // Try fast path regexp
  134.     var simplePath = simplePathPattern.exec(rest);
  135.     if (simplePath) {
  136.       this.path = rest;
  137.       this.href = rest;
  138.       this.pathname = simplePath[1];
  139.       if (simplePath[2]) {
  140.         this.search = simplePath[2];
  141.         if (parseQueryString) {
  142.           this.query = querystring.parse(this.search.substr(1));
  143.         } else {
  144.           this.query = this.search.substr(1);
  145.         }
  146.       } else if (parseQueryString) {
  147.         this.search = '';
  148.         this.query = {};
  149.       }
  150.       return this;
  151.     }
  152.   }
  153.  
  154.   var proto = protocolPattern.exec(rest);
  155.   if (proto) {
  156.     proto = proto[0];
  157.     var lowerProto = proto.toLowerCase();
  158.     this.protocol = lowerProto;
  159.     rest = rest.substr(proto.length);
  160.   }
  161.  
  162.   // figure out if it's got a host
  163.   // user@server is *always* interpreted as a hostname, and url
  164.   // resolution will treat //foo/bar as host=foo,path=bar because that's
  165.   // how the browser resolves relative URLs.
  166.   if (slashesDenoteHost || proto || rest.match(/^\/\/[^@\/]+@[^@\/]+/)) {
  167.     var slashes = rest.substr(0, 2) === '//';
  168.     if (slashes && !(proto && hostlessProtocol[proto])) {
  169.       rest = rest.substr(2);
  170.       this.slashes = true;
  171.     }
  172.   }
  173.  
  174.   if (!hostlessProtocol[proto] &&
  175.       (slashes || (proto && !slashedProtocol[proto]))) {
  176.  
  177.     // there's a hostname.
  178.     // the first instance of /, ?, ;, or # ends the host.
  179.     //
  180.     // If there is an @ in the hostname, then non-host chars *are* allowed
  181.     // to the left of the last @ sign, unless some host-ending character
  182.     // comes *before* the @-sign.
  183.     // URLs are obnoxious.
  184.     //
  185.     // ex:
  186.     // http://a@b@c/ => user:a@b host:c
  187.     // http://a@b?@c => user:a host:c path:/?@c
  188.  
  189.     // v0.12 TODO(isaacs): This is not quite how Chrome does things.
  190.     // Review our test case against browsers more comprehensively.
  191.  
  192.     // find the first instance of any hostEndingChars
  193.     var hostEnd = -1;
  194.     for (var i = 0; i < hostEndingChars.length; i++) {
  195.       var hec = rest.indexOf(hostEndingChars[i]);
  196.       if (hec !== -1 && (hostEnd === -1 || hec < hostEnd))
  197.         hostEnd = hec;
  198.     }
  199.  
  200.     // at this point, either we have an explicit point where the
  201.     // auth portion cannot go past, or the last @ char is the decider.
  202.     var auth, atSign;
  203.     if (hostEnd === -1) {
  204.       // atSign can be anywhere.
  205.       atSign = rest.lastIndexOf('@');
  206.     } else {
  207.       // atSign must be in auth portion.
  208.       // http://a@b/c@d => host:b auth:a path:/c@d
  209.       atSign = rest.lastIndexOf('@', hostEnd);
  210.     }
  211.  
  212.     // Now we have a portion which is definitely the auth.
  213.     // Pull that off.
  214.     if (atSign !== -1) {
  215.       auth = rest.slice(0, atSign);
  216.       rest = rest.slice(atSign + 1);
  217.       this.auth = decodeURIComponent(auth);
  218.     }
  219.  
  220.     // the host is the remaining to the left of the first non-host char
  221.     hostEnd = -1;
  222.     for (var i = 0; i < nonHostChars.length; i++) {
  223.       var hec = rest.indexOf(nonHostChars[i]);
  224.       if (hec !== -1 && (hostEnd === -1 || hec < hostEnd))
  225.         hostEnd = hec;
  226.     }
  227.     // if we still have not hit it, then the entire thing is a host.
  228.     if (hostEnd === -1)
  229.       hostEnd = rest.length;
  230.  
  231.     this.host = rest.slice(0, hostEnd);
  232.     rest = rest.slice(hostEnd);
  233.  
  234.     // pull out port.
  235.     this.parseHost();
  236.  
  237.     // we've indicated that there is a hostname,
  238.     // so even if it's empty, it has to be present.
  239.     this.hostname = this.hostname || '';
  240.  
  241.     // if hostname begins with [ and ends with ]
  242.     // assume that it's an IPv6 address.
  243.     var ipv6Hostname = this.hostname[0] === '[' &&
  244.         this.hostname[this.hostname.length - 1] === ']';
  245.  
  246.     // validate a little.
  247.     if (!ipv6Hostname) {
  248.       var hostparts = this.hostname.split(/\./);
  249.       for (var i = 0, l = hostparts.length; i < l; i++) {
  250.         var part = hostparts[i];
  251.         if (!part) continue;
  252.         if (!part.match(hostnamePartPattern)) {
  253.           var newpart = '';
  254.           for (var j = 0, k = part.length; j < k; j++) {
  255.             if (part.charCodeAt(j) > 127) {
  256.               // we replace non-ASCII char with a temporary placeholder
  257.               // we need this to make sure size of hostname is not
  258.               // broken by replacing non-ASCII by nothing
  259.               newpart += 'x';
  260.             } else {
  261.               newpart += part[j];
  262.             }
  263.           }
  264.           // we test again with ASCII char only
  265.           if (!newpart.match(hostnamePartPattern)) {
  266.             var validParts = hostparts.slice(0, i);
  267.             var notHost = hostparts.slice(i + 1);
  268.             var bit = part.match(hostnamePartStart);
  269.             if (bit) {
  270.               validParts.push(bit[1]);
  271.               notHost.unshift(bit[2]);
  272.             }
  273.             if (notHost.length) {
  274.               rest = '/' + notHost.join('.') + rest;
  275.             }
  276.             this.hostname = validParts.join('.');
  277.             break;
  278.           }
  279.         }
  280.       }
  281.     }
  282.  
  283.     if (this.hostname.length > hostnameMaxLen) {
  284.       this.hostname = '';
  285.     } else {
  286.       // hostnames are always lower case.
  287.       this.hostname = this.hostname.toLowerCase();
  288.     }
  289.  
  290.     if (!ipv6Hostname) {
  291.       // IDNA Support: Returns a punycoded representation of "domain".
  292.       // It only converts parts of the domain name that
  293.       // have non-ASCII characters, i.e. it doesn't matter if
  294.       // you call it with a domain that already is ASCII-only.
  295.       this.hostname = punycode.toASCII(this.hostname);
  296.     }
  297.  
  298.     var p = this.port ? ':' + this.port : '';
  299.     var h = this.hostname || '';
  300.     this.host = h + p;
  301.     this.href += this.host;
  302.  
  303.     // strip [ and ] from the hostname
  304.     // the host field still retains them, though
  305.     if (ipv6Hostname) {
  306.       this.hostname = this.hostname.substr(1, this.hostname.length - 2);
  307.       if (rest[0] !== '/') {
  308.         rest = '/' + rest;
  309.       }
  310.     }
  311.   }
  312.  
  313.   // now rest is set to the post-host stuff.
  314.   // chop off any delim chars.
  315.   if (!unsafeProtocol[lowerProto]) {
  316.  
  317.     // First, make 100% sure that any "autoEscape" chars get
  318.     // escaped, even if encodeURIComponent doesn't think they
  319.     // need to be.
  320.     for (var i = 0, l = autoEscape.length; i < l; i++) {
  321.       var ae = autoEscape[i];
  322.       if (rest.indexOf(ae) === -1)
  323.         continue;
  324.       var esc = encodeURIComponent(ae);
  325.       if (esc === ae) {
  326.         esc = escape(ae);
  327.       }
  328.       rest = rest.split(ae).join(esc);
  329.     }
  330.   }
  331.  
  332.  
  333.   // chop off from the tail first.
  334.   var hash = rest.indexOf('#');
  335.   if (hash !== -1) {
  336.     // got a fragment string.
  337.     this.hash = rest.substr(hash);
  338.     rest = rest.slice(0, hash);
  339.   }
  340.   var qm = rest.indexOf('?');
  341.   if (qm !== -1) {
  342.     this.search = rest.substr(qm);
  343.     this.query = rest.substr(qm + 1);
  344.     if (parseQueryString) {
  345.       this.query = querystring.parse(this.query);
  346.     }
  347.     rest = rest.slice(0, qm);
  348.   } else if (parseQueryString) {
  349.     // no query string, but parseQueryString still requested
  350.     this.search = '';
  351.     this.query = {};
  352.   }
  353.   if (rest) this.pathname = rest;
  354.   if (slashedProtocol[lowerProto] &&
  355.       this.hostname && !this.pathname) {
  356.     this.pathname = '/';
  357.   }
  358.  
  359.   //to support http.request
  360.   if (this.pathname || this.search) {
  361.     var p = this.pathname || '';
  362.     var s = this.search || '';
  363.     this.path = p + s;
  364.   }
  365.  
  366.   // finally, reconstruct the href based on what has been validated.
  367.   this.href = this.format();
  368.   return this;
  369. };
  370.  
  371. // format a parsed object into a url string
  372. function urlFormat(obj) {
  373.   // ensure it's an object, and not a string url.
  374.   // If it's an obj, this is a no-op.
  375.   // this way, you can call url_format() on strings
  376.   // to clean up potentially wonky urls.
  377.   if (util.isString(obj)) obj = urlParse(obj);
  378.   if (!(obj instanceof Url)) return Url.prototype.format.call(obj);
  379.   return obj.format();
  380. }
  381.  
  382. Url.prototype.format = function() {
  383.   var auth = this.auth || '';
  384.   if (auth) {
  385.     auth = encodeURIComponent(auth);
  386.     auth = auth.replace(/%3A/i, ':');
  387.     auth += '@';
  388.   }
  389.  
  390.   var protocol = this.protocol || '',
  391.       pathname = this.pathname || '',
  392.       hash = this.hash || '',
  393.       host = false,
  394.       query = '';
  395.  
  396.   if (this.host) {
  397.     host = auth + this.host;
  398.   } else if (this.hostname) {
  399.     host = auth + (this.hostname.indexOf(':') === -1 ?
  400.         this.hostname :
  401.         '[' + this.hostname + ']');
  402.     if (this.port) {
  403.       host += ':' + this.port;
  404.     }
  405.   }
  406.  
  407.   if (this.query &&
  408.       util.isObject(this.query) &&
  409.       Object.keys(this.query).length) {
  410.     query = querystring.stringify(this.query);
  411.   }
  412.  
  413.   var search = this.search || (query && ('?' + query)) || '';
  414.  
  415.   if (protocol && protocol.substr(-1) !== ':') protocol += ':';
  416.  
  417.   // only the slashedProtocols get the //.  Not mailto:, xmpp:, etc.
  418.   // unless they had them to begin with.
  419.   if (this.slashes ||
  420.       (!protocol || slashedProtocol[protocol]) && host !== false) {
  421.     host = '//' + (host || '');
  422.     if (pathname && pathname.charAt(0) !== '/') pathname = '/' + pathname;
  423.   } else if (!host) {
  424.     host = '';
  425.   }
  426.  
  427.   if (hash && hash.charAt(0) !== '#') hash = '#' + hash;
  428.   if (search && search.charAt(0) !== '?') search = '?' + search;
  429.  
  430.   pathname = pathname.replace(/[?#]/g, function(match) {
  431.     return encodeURIComponent(match);
  432.   });
  433.   search = search.replace('#', '%23');
  434.  
  435.   return protocol + host + pathname + search + hash;
  436. };
  437.  
  438. function urlResolve(source, relative) {
  439.   return urlParse(source, false, true).resolve(relative);
  440. }
  441.  
  442. Url.prototype.resolve = function(relative) {
  443.   return this.resolveObject(urlParse(relative, false, true)).format();
  444. };
  445.  
  446. function urlResolveObject(source, relative) {
  447.   if (!source) return relative;
  448.   return urlParse(source, false, true).resolveObject(relative);
  449. }
  450.  
  451. Url.prototype.resolveObject = function(relative) {
  452.   if (util.isString(relative)) {
  453.     var rel = new Url();
  454.     rel.parse(relative, false, true);
  455.     relative = rel;
  456.   }
  457.  
  458.   var result = new Url();
  459.   var tkeys = Object.keys(this);
  460.   for (var tk = 0; tk < tkeys.length; tk++) {
  461.     var tkey = tkeys[tk];
  462.     result[tkey] = this[tkey];
  463.   }
  464.  
  465.   // hash is always overridden, no matter what.
  466.   // even href="" will remove it.
  467.   result.hash = relative.hash;
  468.  
  469.   // if the relative url is empty, then there's nothing left to do here.
  470.   if (relative.href === '') {
  471.     result.href = result.format();
  472.     return result;
  473.   }
  474.  
  475.   // hrefs like //foo/bar always cut to the protocol.
  476.   if (relative.slashes && !relative.protocol) {
  477.     // take everything except the protocol from relative
  478.     var rkeys = Object.keys(relative);
  479.     for (var rk = 0; rk < rkeys.length; rk++) {
  480.       var rkey = rkeys[rk];
  481.       if (rkey !== 'protocol')
  482.         result[rkey] = relative[rkey];
  483.     }
  484.  
  485.     //urlParse appends trailing / to urls like http://www.example.com
  486.     if (slashedProtocol[result.protocol] &&
  487.         result.hostname && !result.pathname) {
  488.       result.path = result.pathname = '/';
  489.     }
  490.  
  491.     result.href = result.format();
  492.     return result;
  493.   }
  494.  
  495.   if (relative.protocol && relative.protocol !== result.protocol) {
  496.     // if it's a known url protocol, then changing
  497.     // the protocol does weird things
  498.     // first, if it's not file:, then we MUST have a host,
  499.     // and if there was a path
  500.     // to begin with, then we MUST have a path.
  501.     // if it is file:, then the host is dropped,
  502.     // because that's known to be hostless.
  503.     // anything else is assumed to be absolute.
  504.     if (!slashedProtocol[relative.protocol]) {
  505.       var keys = Object.keys(relative);
  506.       for (var v = 0; v < keys.length; v++) {
  507.         var k = keys[v];
  508.         result[k] = relative[k];
  509.       }
  510.       result.href = result.format();
  511.       return result;
  512.     }
  513.  
  514.     result.protocol = relative.protocol;
  515.     if (!relative.host && !hostlessProtocol[relative.protocol]) {
  516.       var relPath = (relative.pathname || '').split('/');
  517.       while (relPath.length && !(relative.host = relPath.shift()));
  518.       if (!relative.host) relative.host = '';
  519.       if (!relative.hostname) relative.hostname = '';
  520.       if (relPath[0] !== '') relPath.unshift('');
  521.       if (relPath.length < 2) relPath.unshift('');
  522.       result.pathname = relPath.join('/');
  523.     } else {
  524.       result.pathname = relative.pathname;
  525.     }
  526.     result.search = relative.search;
  527.     result.query = relative.query;
  528.     result.host = relative.host || '';
  529.     result.auth = relative.auth;
  530.     result.hostname = relative.hostname || relative.host;
  531.     result.port = relative.port;
  532.     // to support http.request
  533.     if (result.pathname || result.search) {
  534.       var p = result.pathname || '';
  535.       var s = result.search || '';
  536.       result.path = p + s;
  537.     }
  538.     result.slashes = result.slashes || relative.slashes;
  539.     result.href = result.format();
  540.     return result;
  541.   }
  542.  
  543.   var isSourceAbs = (result.pathname && result.pathname.charAt(0) === '/'),
  544.       isRelAbs = (
  545.           relative.host ||
  546.           relative.pathname && relative.pathname.charAt(0) === '/'
  547.       ),
  548.       mustEndAbs = (isRelAbs || isSourceAbs ||
  549.                     (result.host && relative.pathname)),
  550.       removeAllDots = mustEndAbs,
  551.       srcPath = result.pathname && result.pathname.split('/') || [],
  552.       relPath = relative.pathname && relative.pathname.split('/') || [],
  553.       psychotic = result.protocol && !slashedProtocol[result.protocol];
  554.  
  555.   // if the url is a non-slashed url, then relative
  556.   // links like ../.. should be able
  557.   // to crawl up to the hostname, as well.  This is strange.
  558.   // result.protocol has already been set by now.
  559.   // Later on, put the first path part into the host field.
  560.   if (psychotic) {
  561.     result.hostname = '';
  562.     result.port = null;
  563.     if (result.host) {
  564.       if (srcPath[0] === '') srcPath[0] = result.host;
  565.       else srcPath.unshift(result.host);
  566.     }
  567.     result.host = '';
  568.     if (relative.protocol) {
  569.       relative.hostname = null;
  570.       relative.port = null;
  571.       if (relative.host) {
  572.         if (relPath[0] === '') relPath[0] = relative.host;
  573.         else relPath.unshift(relative.host);
  574.       }
  575.       relative.host = null;
  576.     }
  577.     mustEndAbs = mustEndAbs && (relPath[0] === '' || srcPath[0] === '');
  578.   }
  579.  
  580.   if (isRelAbs) {
  581.     // it's absolute.
  582.     result.host = (relative.host || relative.host === '') ?
  583.                   relative.host : result.host;
  584.     result.hostname = (relative.hostname || relative.hostname === '') ?
  585.                       relative.hostname : result.hostname;
  586.     result.search = relative.search;
  587.     result.query = relative.query;
  588.     srcPath = relPath;
  589.     // fall through to the dot-handling below.
  590.   } else if (relPath.length) {
  591.     // it's relative
  592.     // throw away the existing file, and take the new path instead.
  593.     if (!srcPath) srcPath = [];
  594.     srcPath.pop();
  595.     srcPath = srcPath.concat(relPath);
  596.     result.search = relative.search;
  597.     result.query = relative.query;
  598.   } else if (!util.isNullOrUndefined(relative.search)) {
  599.     // just pull out the search.
  600.     // like href='?foo'.
  601.     // Put this after the other two cases because it simplifies the booleans
  602.     if (psychotic) {
  603.       result.hostname = result.host = srcPath.shift();
  604.       //occationaly the auth can get stuck only in host
  605.       //this especially happens in cases like
  606.       //url.resolveObject('mailto:local1@domain1', 'local2@domain2')
  607.       var authInHost = result.host && result.host.indexOf('@') > 0 ?
  608.                        result.host.split('@') : false;
  609.       if (authInHost) {
  610.         result.auth = authInHost.shift();
  611.         result.host = result.hostname = authInHost.shift();
  612.       }
  613.     }
  614.     result.search = relative.search;
  615.     result.query = relative.query;
  616.     //to support http.request
  617.     if (!util.isNull(result.pathname) || !util.isNull(result.search)) {
  618.       result.path = (result.pathname ? result.pathname : '') +
  619.                     (result.search ? result.search : '');
  620.     }
  621.     result.href = result.format();
  622.     return result;
  623.   }
  624.  
  625.   if (!srcPath.length) {
  626.     // no path at all.  easy.
  627.     // we've already handled the other stuff above.
  628.     result.pathname = null;
  629.     //to support http.request
  630.     if (result.search) {
  631.       result.path = '/' + result.search;
  632.     } else {
  633.       result.path = null;
  634.     }
  635.     result.href = result.format();
  636.     return result;
  637.   }
  638.  
  639.   // if a url ENDs in . or .., then it must get a trailing slash.
  640.   // however, if it ends in anything else non-slashy,
  641.   // then it must NOT get a trailing slash.
  642.   var last = srcPath.slice(-1)[0];
  643.   var hasTrailingSlash = (
  644.       (result.host || relative.host || srcPath.length > 1) &&
  645.       (last === '.' || last === '..') || last === '');
  646.  
  647.   // strip single dots, resolve double dots to parent dir
  648.   // if the path tries to go above the root, `up` ends up > 0
  649.   var up = 0;
  650.   for (var i = srcPath.length; i >= 0; i--) {
  651.     last = srcPath[i];
  652.     if (last === '.') {
  653.       srcPath.splice(i, 1);
  654.     } else if (last === '..') {
  655.       srcPath.splice(i, 1);
  656.       up++;
  657.     } else if (up) {
  658.       srcPath.splice(i, 1);
  659.       up--;
  660.     }
  661.   }
  662.  
  663.   // if the path is allowed to go above the root, restore leading ..s
  664.   if (!mustEndAbs && !removeAllDots) {
  665.     for (; up--; up) {
  666.       srcPath.unshift('..');
  667.     }
  668.   }
  669.  
  670.   if (mustEndAbs && srcPath[0] !== '' &&
  671.       (!srcPath[0] || srcPath[0].charAt(0) !== '/')) {
  672.     srcPath.unshift('');
  673.   }
  674.  
  675.   if (hasTrailingSlash && (srcPath.join('/').substr(-1) !== '/')) {
  676.     srcPath.push('');
  677.   }
  678.  
  679.   var isAbsolute = srcPath[0] === '' ||
  680.       (srcPath[0] && srcPath[0].charAt(0) === '/');
  681.  
  682.   // put the host back
  683.   if (psychotic) {
  684.     result.hostname = result.host = isAbsolute ? '' :
  685.                                     srcPath.length ? srcPath.shift() : '';
  686.     //occationaly the auth can get stuck only in host
  687.     //this especially happens in cases like
  688.     //url.resolveObject('mailto:local1@domain1', 'local2@domain2')
  689.     var authInHost = result.host && result.host.indexOf('@') > 0 ?
  690.                      result.host.split('@') : false;
  691.     if (authInHost) {
  692.       result.auth = authInHost.shift();
  693.       result.host = result.hostname = authInHost.shift();
  694.     }
  695.   }
  696.  
  697.   mustEndAbs = mustEndAbs || (result.host && srcPath.length);
  698.  
  699.   if (mustEndAbs && !isAbsolute) {
  700.     srcPath.unshift('');
  701.   }
  702.  
  703.   if (!srcPath.length) {
  704.     result.pathname = null;
  705.     result.path = null;
  706.   } else {
  707.     result.pathname = srcPath.join('/');
  708.   }
  709.  
  710.   //to support request.http
  711.   if (!util.isNull(result.pathname) || !util.isNull(result.search)) {
  712.     result.path = (result.pathname ? result.pathname : '') +
  713.                   (result.search ? result.search : '');
  714.   }
  715.   result.auth = relative.auth || result.auth;
  716.   result.slashes = result.slashes || relative.slashes;
  717.   result.href = result.format();
  718.   return result;
  719. };
  720.  
  721. Url.prototype.parseHost = function() {
  722.   var host = this.host;
  723.   var port = portPattern.exec(host);
  724.   if (port) {
  725.     port = port[0];
  726.     if (port !== ':') {
  727.       this.port = port.substr(1);
  728.     }
  729.     host = host.substr(0, host.length - port.length);
  730.   }
  731.   if (host) this.hostname = host;
  732. };

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