First attempt

.editorconfig

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+# editorconfig.org
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.md]
+trim_trailing_whitespace = false

.gitignore

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+node_modules

.jshintrc

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+{
+  "node": true,
+    "esnext": true,
+    "bitwise": true,
+    "camelcase": true,
+    "curly": true,
+    "eqeqeq": true,
+    "immed": true,
+    "indent": 2,
+    "latedef": true,
+    "newcap": true,
+    "noarg": true,
+    "quotmark": "single",
+    "regexp": true,
+    "undef": true,
+    "unused": true,
+    "strict": true,
+    "trailing": true,
+    "smarttabs": true
+}

.travis.yml

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+language: node_js
+node_js:
+  - '0.10'

LICENSE

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+Copyright (C) 2014 Pascal Hartig
+
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+Node DOM URLs
+=============
+
+A partial implementation of the [W3C URL Spec Draft](https://dvcs.w3.org/hg/url/raw-file/tip/Overview.html) for Node.
+
+If you find incompatabilities, please [report them](https://github.com/passy/node-dom-urls/issues). Error handling is currently very different from the spec.
+
+Browser Polyfills
+-----------------
+
+  - [Joshua Bell's Polyfill](https://github.com/inexorabletash/polyfill/blob/master/url.js)
+  - [Eric Arvidsson's Polyfill](https://github.com/arv/DOM-URL-Polyfill)

index.js

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+'use strict';
+
+var url = require('url');
+
+function _parseURL(urlStr, base) {
+  var _url;
+
+  if (base) {
+    urlStr = url.resolve(base, urlStr);
+  }
+
+  _url = url.parse(
+    urlStr,
+    /* parseQueryString */ true,
+    /* slashesDenoteHost */ true
+  );
+
+  if (!_url.protocol) {
+    throw new TypeError('Failed to construct URL: Invalid URL');
+  }
+
+  return _url;
+}
+
+function URL(urlStr, base) {
+  this._url = _parseURL(urlStr, base);
+}
+
+URL.prototype = {
+  toString: function () {
+    return this.href;
+  },
+
+  get href() {
+    return this._url.format();
+  },
+
+  set href(value) {
+    this._url = _parseURL(value);
+  },
+
+  get host() {
+    return this._url.host;
+  },
+
+  set host(value) {
+    // The host value affects multiple attributes, but the `url` module
+    // doesn't cascade the changes, so we manually update them.
+    var newUrl = url.parse('proto:' + value);
+
+    if (newUrl.port) {
+      this._url.port = newUrl.port;
+      this._url.host = newUrl.host;
+    } else if (this._url.port) {
+      this._url.host = newUrl.host + ':' + this._url.port;
+    } else {
+      this._url.host = newUrl.host;
+    }
+
+    this._url.hostname = newUrl.hostname;
+  },
+
+  get hostname() {
+    return this._url.hostname;
+  },
+
+  set hostname(value) {
+    // Replace a port if it's in place and treat it like a host change
+    // afterwards.
+    this.host = value.replace(/(\:.*)?$/, '');
+  },
+
+  get protocol() {
+    return this._url.protocol;
+  },
+
+  set protocol(value) {
+    // Strip the colon, including anything following it and replace it with a
+    // single one.
+    this._url.protocol = value.replace(/(\:.*)?$/, ':');
+  },
+
+  get port() {
+    // Port should be an empty string (zero ASCII digits) instead of null in DOM
+    // land. (Section 4.1)
+    return this._url.port || '';
+  },
+
+  set port(value) {
+    this._url.port = value;
+  },
+
+  get pathname() {
+    return this._url.pathname;
+  },
+
+  set pathname(value) {
+
+  }
+};
+
+[
+].forEach(function (property) {
+  Object.defineProperty(URL.prototype, property, {
+    get: function () {
+      return this._url[property];
+    },
+    set: function (value) {
+      this._url[property] = value;
+    }
+  });
+});
+
+module.exports = {
+  URL: URL
+};

package.json

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+{
+  "name": "dom-urls",
+  "version": "0.0.0",
+  "description": "DOM URLs for Node",
+  "main": "index.js",
+  "files": [
+    "index.js"
+  ],
+  "scripts": {
+    "test": "mocha -u tdd"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/passy/node-dom-urls"
+  },
+  "keywords": [
+    "dom",
+    "url",
+    "urls"
+  ],
+  "author": {
+    "name": "Pascal Hartig",
+    "email": "passy@twitter.com",
+    "url": "http://passy.me/"
+  },
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/passy/node-dom-urls/issues"
+  },
+  "devDependencies": {
+    "mocha": "~1.16.2",
+    "chai": "~1.8.1"
+  },
+  "dependencies": {
+    "extend": "~1.2.1",
+    "URIjs": "~1.11.2"
+  }
+}