Add DOMParser interface (WIP)

This implementation seems to work correctly when the content type is set
to "text/html", however the XML types fall through the HTMLParser since
there's no XMLSerializer interface.

Author: penguinput

lib/DOMParser.js

@@ -0,0 +1,70 @@
+"use strict";
+var HTMLParser = require("./HTMLParser");
+
+// https://www.w3.org/TR/DOM-Parsing/#the-domparser-interface
+
+var supportedTypes = [
+  "text/html",
+  "text/xml",
+  "application/xml",
+  "application/xhtml+xml",
+  "image/svg+xml"
+];
+
+function DOMParserWrapper(win) {
+  function DOMParser() {}
+
+  DOMParser.prototype = {
+    parseFromString: function(str, type) {
+      if (arguments.length < 2) {
+        throw new TypeError(
+          "Not enough arguments to DOMParser.parseFromString."
+        );
+      }
+
+      if (supportedTypes.indexOf(type) === -1) {
+        throw new TypeError(
+          "Argument 2 of DOMParser.parseFromString '" + type +
+          "' is not a valid value for enumeration SupportedType."
+        );
+      }
+
+      // FIX ME: without the XMLSerializer interface, the document is always
+      // parsed as HTML.
+      var isHTML = true || /html$/.test(type);
+      var doc = null;
+      var address = win.document._address;
+      var parserOptions = {scripting_enabled: false};
+
+      if (isHTML) {
+        // As per spec, set the address to the active document URL and disable
+        // the scripting flag, so "noscript" tags are parsed correctly.
+        var parser = new HTMLParser(address, undefined, parserOptions);
+
+        parser.parse(str || "", true);
+
+        doc = parser.document();
+      } else {
+        // TODO: XML parsing code
+      }
+
+      if (doc) {
+        // Set the correct content type:
+        doc._contentType = type;
+
+        // Set the location to null:
+        // (currently it throws, because the location setter is not yet
+        // implemented, however, by default it should already be null)
+        /*doc.location = null;*/
+      } else {
+        throw new Error("This should never happen");
+      }
+
+      return doc;
+    }
+  };
+
+  return DOMParser;
+}
+
+module.exports = DOMParserWrapper;

lib/Window.js

@@ -4,6 +4,7 @@ var EventTarget = require('./EventTarget');
 var Location = require('./Location');
 var sloppy = require('./sloppy');
 var utils = require('./utils');
+var DOMParserWrapper = require("./DOMParser");
 
 module.exports = Window;
 
@@ -12,6 +13,7 @@ function Window(document) {
   this.document._scripting_enabled = true;
   this.document.defaultView = this;
   this.location = new Location(this, this.document._address || 'about:blank');
+  this.DOMParser = DOMParserWrapper(this);
 }
 
 Window.prototype = Object.create(EventTarget.prototype, {