Skip to content

Instantly share code, notes, and snippets.

@cshaa

cshaa/getRelativeURL.js

Created August 26, 2016 10:54
Show Gist options
  • Save cshaa/2553dd45de35aa05d0233c6f9dc04bc2 to your computer and use it in GitHub Desktop.
Save cshaa/2553dd45de35aa05d0233c6f9dc04bc2 to your computer and use it in GitHub Desktop.
Download ZIP
JavaScript URL processing library
Raw
getRelativeURL.js
/* Any copyright is dedicated to the Public Domain.
* http://creativecommons.org/publicdomain/zero/1.0/ */
(function(){
/**
* Rewrite this URL as an URL relative to the base.
* TODO: Doesn't support backslashes!
*
* @parameter {string|URL} base The resulting URL will be relative to this one.
* @parameter {bool=false} [reload] `false` to use "#" whenever the path and query of this url and the base are equal,
* `true` to use filename or query (forces reload in browsers)
* @parameter {bool|undefined} [root] `true` to force root-relative paths (eg. "/dir/file"),
* `false` to force directory-relative paths (eg. "../file"),
* `undefined` to allways use the shorter one.
* @parameter {bool|string} [dotSlash] Optional, whether or not to include the "./" in relative paths.
* If the value is "force", it will be included even before "../".
*/
URL.prototype.getRelativeURL = function getRelativeURL(base,reload,root,dotSlash){
reload = !!reload;
dotSlash === "force" || (dotSlash = !!dotSlash);
root === undefined || (root = !!root);
try{
base = new URL( base );
}catch(e){
base = new URL( document.URL );
}
var rel = "";
if(this.protocol !== base.protocol){
return this.href;
}
if(this.host !== base.host ||
this.username !== base.username ||
this.password !== base.password){
rel = "//";
if(this.username){
rel += this.username;
if(this.password)
rel += ":" + this.password;
rel += "@";
}
rel += this.host;
rel += this.pathname;
rel += this.search;
rel += this.hash;
return rel;
}
if(this.pathname !== base.pathname){
if(root){
rel = this.pathname;
}else{
var thisPath = this.pathname.split("/");
var basePath = base.pathname.split("/");
var tl = thisPath.length;
var bl = basePath.length;
for( var i = 1, l = Math.min(tl,bl)-1; i < l; i++ ){
if( thisPath[i] !== basePath[i] ){
break;
}
}
for(var cd = bl-1; cd > i; cd--){
if(!rel && dotSlash==="force"){
rel += "./";
}
rel += "../";
}
if(dotSlash && !rel)
rel += "./";
for(l=tl; i<l; i++){
rel += thisPath[i];
if(i !== l-1){
rel += "/";
}
}
if(root !== false && rel.length > this.pathname.length){
rel = this.pathname;
}
if(!rel && basePath[basePath.length-1]){
rel = "./";
}
}
}
if( rel || this.search !== base.search ){
rel += this.search;
rel += this.hash;
}
if( !rel ){
if( reload ){
rel = this.search || "?";
rel += this.hash;
}else{
rel = this.hash || "#";
}
}
return rel;
};
})();
Raw
shim.js
/* github.com/Polymer/URL
* Any copyright is dedicated to the Public Domain.
* http://creativecommons.org/publicdomain/zero/1.0/ */
(function(scope) {
'use strict';
if(!Object.hasOwnProperty(Document.prototype,"URL")){
Object.defineProperty(Document.prototype,"URL",{
enumerable: true,
configurable: true,
get: function(){
return window.location.href;
}
});
}
// feature detect for URL constructor
var hasWorkingUrl = false;
if (!scope.forceJURL) {
try {
var u = new URL('b', 'http://a');
u.pathname = 'c%20d';
hasWorkingUrl = u.href === 'http://a/c%20d';
} catch(e) {}
}
if (hasWorkingUrl)
return;
var relative = Object.create(null);
relative['ftp'] = 21;
relative['file'] = 0;
relative['gopher'] = 70;
relative['http'] = 80;
relative['https'] = 443;
relative['ws'] = 80;
relative['wss'] = 443;
var relativePathDotMapping = Object.create(null);
relativePathDotMapping['%2e'] = '.';
relativePathDotMapping['.%2e'] = '..';
relativePathDotMapping['%2e.'] = '..';
relativePathDotMapping['%2e%2e'] = '..';
function isRelativeScheme(scheme) {
return relative[scheme] !== undefined;
}
function invalid() {
clear.call(this);
this._isInvalid = true;
}
function IDNAToASCII(h) {
if ('' == h) {
invalid.call(this)
}
// XXX
return h.toLowerCase()
}
function percentEscape(c) {
var unicode = c.charCodeAt(0);
if (unicode > 0x20 &&
unicode < 0x7F &&
// " # < > ? `
[0x22, 0x23, 0x3C, 0x3E, 0x3F, 0x60].indexOf(unicode) == -1
) {
return c;
}
return encodeURIComponent(c);
}
function percentEscapeQuery(c) {
// XXX This actually needs to encode c using encoding and then
// convert the bytes one-by-one.
var unicode = c.charCodeAt(0);
if (unicode > 0x20 &&
unicode < 0x7F &&
// " # < > ` (do not escape '?')
[0x22, 0x23, 0x3C, 0x3E, 0x60].indexOf(unicode) == -1
) {
return c;
}
return encodeURIComponent(c);
}
var EOF = undefined,
ALPHA = /[a-zA-Z]/,
ALPHANUMERIC = /[a-zA-Z0-9\+\-\.]/;
function parse(input, stateOverride, base) {
function err(message) {
errors.push(message)
}
var state = stateOverride || 'scheme start',
cursor = 0,
buffer = '',
seenAt = false,
seenBracket = false,
errors = [];
loop: while ((input[cursor - 1] != EOF || cursor == 0) && !this._isInvalid) {
var c = input[cursor];
switch (state) {
case 'scheme start':
if (c && ALPHA.test(c)) {
buffer += c.toLowerCase(); // ASCII-safe
state = 'scheme';
} else if (!stateOverride) {
buffer = '';
state = 'no scheme';
continue;
} else {
err('Invalid scheme.');
break loop;
}
break;
case 'scheme':
if (c && ALPHANUMERIC.test(c)) {
buffer += c.toLowerCase(); // ASCII-safe
} else if (':' == c) {
this._scheme = buffer;
buffer = '';
if (stateOverride) {
break loop;
}
if (isRelativeScheme(this._scheme)) {
this._isRelative = true;
}
if ('file' == this._scheme) {
state = 'relative';
} else if (this._isRelative && base && base._scheme == this._scheme) {
state = 'relative or authority';
} else if (this._isRelative) {
state = 'authority first slash';
} else {
state = 'scheme data';
}
} else if (!stateOverride) {
buffer = '';
cursor = 0;
state = 'no scheme';
continue;
} else if (EOF == c) {
break loop;
} else {
err('Code point not allowed in scheme: ' + c)
break loop;
}
break;
case 'scheme data':
if ('?' == c) {
query = '?';
state = 'query';
} else if ('#' == c) {
this._fragment = '#';
state = 'fragment';
} else {
// XXX error handling
if (EOF != c && '\t' != c && '\n' != c && '\r' != c) {
this._schemeData += percentEscape(c);
}
}
break;
case 'no scheme':
if (!base || !(isRelativeScheme(base._scheme))) {
err('Missing scheme.');
invalid.call(this);
} else {
state = 'relative';
continue;
}
break;
case 'relative or authority':
if ('/' == c && '/' == input[cursor+1]) {
state = 'authority ignore slashes';
} else {
err('Expected /, got: ' + c);
state = 'relative';
continue
}
break;
case 'relative':
this._isRelative = true;
if ('file' != this._scheme)
this._scheme = base._scheme;
if (EOF == c) {
this._host = base._host;
this._port = base._port;
this._path = base._path.slice();
this._query = base._query;
this._username = base._username;
this._password = base._password;
break loop;
} else if ('/' == c || '\\' == c) {
if ('\\' == c)
err('\\ is an invalid code point.');
state = 'relative slash';
} else if ('?' == c) {
this._host = base._host;
this._port = base._port;
this._path = base._path.slice();
this._query = '?';
this._username = base._username;
this._password = base._password;
state = 'query';
} else if ('#' == c) {
this._host = base._host;
this._port = base._port;
this._path = base._path.slice();
this._query = base._query;
this._fragment = '#';
this._username = base._username;
this._password = base._password;
state = 'fragment';
} else {
var nextC = input[cursor+1]
var nextNextC = input[cursor+2]
if (
'file' != this._scheme || !ALPHA.test(c) ||
(nextC != ':' && nextC != '|') ||
(EOF != nextNextC && '/' != nextNextC && '\\' != nextNextC && '?' != nextNextC && '#' != nextNextC)) {
this._host = base._host;
this._port = base._port;
this._username = base._username;
this._password = base._password;
this._path = base._path.slice();
this._path.pop();
}
state = 'relative path';
continue;
}
break;
case 'relative slash':
if ('/' == c || '\\' == c) {
if ('\\' == c) {
err('\\ is an invalid code point.');
}
if ('file' == this._scheme) {
state = 'file host';
} else {
state = 'authority ignore slashes';
}
} else {
if ('file' != this._scheme) {
this._host = base._host;
this._port = base._port;
this._username = base._username;
this._password = base._password;
}
state = 'relative path';
continue;
}
break;
case 'authority first slash':
if ('/' == c) {
state = 'authority second slash';
} else {
err("Expected '/', got: " + c);
state = 'authority ignore slashes';
continue;
}
break;
case 'authority second slash':
state = 'authority ignore slashes';
if ('/' != c) {
err("Expected '/', got: " + c);
continue;
}
break;
case 'authority ignore slashes':
if ('/' != c && '\\' != c) {
state = 'authority';
continue;
} else {
err('Expected authority, got: ' + c);
}
break;
case 'authority':
if ('@' == c) {
if (seenAt) {
err('@ already seen.');
buffer += '%40';
}
seenAt = true;
for (var i = 0; i < buffer.length; i++) {
var cp = buffer[i];
if ('\t' == cp || '\n' == cp || '\r' == cp) {
err('Invalid whitespace in authority.');
continue;
}
// XXX check URL code points
if (':' == cp && null === this._password) {
this._password = '';
continue;
}
var tempC = percentEscape(cp);
(null !== this._password) ? this._password += tempC : this._username += tempC;
}
buffer = '';
} else if (EOF == c || '/' == c || '\\' == c || '?' == c || '#' == c) {
cursor -= buffer.length;
buffer = '';
state = 'host';
continue;
} else {
buffer += c;
}
break;
case 'file host':
if (EOF == c || '/' == c || '\\' == c || '?' == c || '#' == c) {
if (buffer.length == 2 && ALPHA.test(buffer[0]) && (buffer[1] == ':' || buffer[1] == '|')) {
state = 'relative path';
} else if (buffer.length == 0) {
state = 'relative path start';
} else {
this._host = IDNAToASCII.call(this, buffer);
buffer = '';
state = 'relative path start';
}
continue;
} else if ('\t' == c || '\n' == c || '\r' == c) {
err('Invalid whitespace in file host.');
} else {
buffer += c;
}
break;
case 'host':
case 'hostname':
if (':' == c && !seenBracket) {
// XXX host parsing
this._host = IDNAToASCII.call(this, buffer);
buffer = '';
state = 'port';
if ('hostname' == stateOverride) {
break loop;
}
} else if (EOF == c || '/' == c || '\\' == c || '?' == c || '#' == c) {
this._host = IDNAToASCII.call(this, buffer);
buffer = '';
state = 'relative path start';
if (stateOverride) {
break loop;
}
continue;
} else if ('\t' != c && '\n' != c && '\r' != c) {
if ('[' == c) {
seenBracket = true;
} else if (']' == c) {
seenBracket = false;
}
buffer += c;
} else {
err('Invalid code point in host/hostname: ' + c);
}
break;
case 'port':
if (/[0-9]/.test(c)) {
buffer += c;
} else if (EOF == c || '/' == c || '\\' == c || '?' == c || '#' == c || stateOverride) {
if ('' != buffer) {
var temp = parseInt(buffer, 10);
if (temp != relative[this._scheme]) {
this._port = temp + '';
}
buffer = '';
}
if (stateOverride) {
break loop;
}
state = 'relative path start';
continue;
} else if ('\t' == c || '\n' == c || '\r' == c) {
err('Invalid code point in port: ' + c);
} else {
invalid.call(this);
}
break;
case 'relative path start':
if ('\\' == c)
err("'\\' not allowed in path.");
state = 'relative path';
if ('/' != c && '\\' != c) {
continue;
}
break;
case 'relative path':
if (EOF == c || '/' == c || '\\' == c || (!stateOverride && ('?' == c || '#' == c))) {
if ('\\' == c) {
err('\\ not allowed in relative path.');
}
var tmp;
if (tmp = relativePathDotMapping[buffer.toLowerCase()]) {
buffer = tmp;
}
if ('..' == buffer) {
this._path.pop();
if ('/' != c && '\\' != c) {
this._path.push('');
}
} else if ('.' == buffer && '/' != c && '\\' != c) {
this._path.push('');
} else if ('.' != buffer) {
if ('file' == this._scheme && this._path.length == 0 && buffer.length == 2 && ALPHA.test(buffer[0]) && buffer[1] == '|') {
buffer = buffer[0] + ':';
}
this._path.push(buffer);
}
buffer = '';
if ('?' == c) {
this._query = '?';
state = 'query';
} else if ('#' == c) {
this._fragment = '#';
state = 'fragment';
}
} else if ('\t' != c && '\n' != c && '\r' != c) {
buffer += percentEscape(c);
}
break;
case 'query':
if (!stateOverride && '#' == c) {
this._fragment = '#';
state = 'fragment';
} else if (EOF != c && '\t' != c && '\n' != c && '\r' != c) {
this._query += percentEscapeQuery(c);
}
break;
case 'fragment':
if (EOF != c && '\t' != c && '\n' != c && '\r' != c) {
this._fragment += c;
}
break;
}
cursor++;
}
}
function clear() {
this._scheme = '';
this._schemeData = '';
this._username = '';
this._password = null;
this._host = '';
this._port = '';
this._path = [];
this._query = '';
this._fragment = '';
this._isInvalid = false;
this._isRelative = false;
}
// Does not process domain names or IP addresses.
// Does not handle encoding for the query parameter.
function jURL(url, base /* , encoding */) {
if (base !== undefined && !(base instanceof jURL))
base = new jURL(String(base));
this._url = String(url);
clear.call(this);
var input = url.replace(/^[ \t\r\n\f]+|[ \t\r\n\f]+$/g, '');
// encoding = encoding || 'utf-8'
parse.call(this, input, null, base);
}
jURL.prototype = {
toString: function() {
return this.href;
},
get href() {
if (this._isInvalid)
return this._url;
var authority = '';
if ('' != this._username || null != this._password) {
authority = this._username +
(null != this._password ? ':' + this._password : '') + '@';
}
return this.protocol +
(this._isRelative ? '//' + authority + this.host : '') +
this.pathname + this._query + this._fragment;
},
set href(href) {
clear.call(this);
parse.call(this, href);
},
get protocol() {
return this._scheme + ':';
},
set protocol(protocol) {
if (this._isInvalid)
return;
parse.call(this, protocol + ':', 'scheme start');
},
get host() {
return this._isInvalid ? '' : this._port ?
this._host + ':' + this._port : this._host;
},
set host(host) {
if (this._isInvalid || !this._isRelative)
return;
parse.call(this, host, 'host');
},
get hostname() {
return this._host;
},
set hostname(hostname) {
if (this._isInvalid || !this._isRelative)
return;
parse.call(this, hostname, 'hostname');
},
get port() {
return this._port;
},
set port(port) {
if (this._isInvalid || !this._isRelative)
return;
parse.call(this, port, 'port');
},
get pathname() {
return this._isInvalid ? '' : this._isRelative ?
'/' + this._path.join('/') : this._schemeData;
},
set pathname(pathname) {
if (this._isInvalid || !this._isRelative)
return;
this._path = [];
parse.call(this, pathname, 'relative path start');
},
get search() {
return this._isInvalid || !this._query || '?' == this._query ?
'' : this._query;
},
set search(search) {
if (this._isInvalid || !this._isRelative)
return;
this._query = '?';
if ('?' == search[0])
search = search.slice(1);
parse.call(this, search, 'query');
},
get hash() {
return this._isInvalid || !this._fragment || '#' == this._fragment ?
'' : this._fragment;
},
set hash(hash) {
if (this._isInvalid)
return;
this._fragment = '#';
if ('#' == hash[0])
hash = hash.slice(1);
parse.call(this, hash, 'fragment');
},
get origin() {
var host;
if (this._isInvalid || !this._scheme) {
return '';
}
// javascript: Gecko returns String(""), WebKit/Blink String("null")
// Gecko throws error for "data://"
// data: Gecko returns "", Blink returns "data://", WebKit returns "null"
// Gecko returns String("") for file: mailto:
// WebKit/Blink returns String("SCHEME://") for file: mailto:
switch (this._scheme) {
case 'data':
case 'file':
case 'javascript':
case 'mailto':
return 'null';
}
host = this.host;
if (!host) {
return '';
}
return this._scheme + '://' + host;
}
};
// Copy over the static methods
var OriginalURL = scope.URL;
if (OriginalURL) {
jURL.createObjectURL = function(blob) {
// IE extension allows a second optional options argument.
// http://msdn.microsoft.com/en-us/library/ie/hh772302(v=vs.85).aspx
return OriginalURL.createObjectURL.apply(OriginalURL, arguments);
};
jURL.revokeObjectURL = function(url) {
OriginalURL.revokeObjectURL(url);
};
}
scope.URL = jURL;
})(this);
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment