Assume Document may be HtmlDocument

sdk/lib/_internal/lib/native_helper.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of _js_helper;
 
 
 // TODO(ngeoffray): stop using this method once our optimizers can
 // change str1.contains(str2) into str1.indexOf(str2) != -1.
 bool contains(String userAgent, String name) {
@@ skipping 371 matching lines @@
       JS('', '#(#)', _fallbackConstructorHooksTransformerGenerator,
           _constructorNameFallback);
   hooks = applyHooksTransformer(_fallbackConstructorHooksTransformer, hooks);
 
   // Customize for browsers:
   hooks = applyHooksTransformer(_firefoxHooksTransformer, hooks);
   hooks = applyHooksTransformer(_ieHooksTransformer, hooks);
   hooks = applyHooksTransformer(_operaHooksTransformer, hooks);
   hooks = applyHooksTransformer(_safariHooksTransformer, hooks);
 
+  hooks = applyHooksTransformer(_fixDocumentHooksTransformer, hooks);
+
   // TODO(sra): Update ShadowDOM polyfil to use
   // [dartNativeDispatchHooksTransformer] and remove this hook.
   hooks = applyHooksTransformer(_dartExperimentalFixupGetTagHooksTransformer,
       hooks);
 
   // Apply global hooks.
   //
   // If defined, dartNativeDispatchHookdTransformer should be a single function
   // of a JavaScript Array of functions.
 
@@ skipping 137 matching lines @@
     "HTMLDDElement": "HTMLElement",
     "HTMLDTElement": "HTMLElement",
     "HTMLPhraseElement": "HTMLElement",
     "Position": "Geoposition"
   };
 
   function getTagIE(o) {
     var tag = getTag(o);
     var newTag = quickMap[tag];
     if (newTag) return newTag;
-    if (tag == "Document") {
-      // IE calls both HTML and XML documents "Document", so we check for the
-      // xmlVersion property, which is the empty string on HTML documents.
-      // Since both dart:html classes Document and HtmlDocument share the same
-      // type, we must patch the instances and not the prototype.
-      if (!!o.xmlVersion) return "!Document";
-      return "!HTMLDocument";
-    }
     // Patches for types which report themselves as Objects.
     if (tag == "Object") {
       if (window.DataView && (o instanceof window.DataView)) return "DataView";
     }
     return tag;
   }
 
   function prototypeForTagIE(tag) {
-    if (tag == "Document") return null;  // Do not pre-patch Document.
     var constructor = window[tag];
     if (constructor == null) return null;
     return constructor.prototype;
   }
 
   hooks.getTag = getTagIE;
   hooks.prototypeForTag = prototypeForTagIE;
 }''');
 
+const _fixDocumentHooksTransformer = const JS_CONST(r'''
+function(hooks) {
+  var getTag = hooks.getTag;
+  var prototypeForTag = hooks.prototypeForTag;
+  function getTagFixed(o) {
+    var tag = getTag(o);
+    if (tag == "Document") {
+      // Some browsers and the polymer polyfill call both HTML and XML documents
+      // "Document", so we check for the xmlVersion property, which is the empty
+      // string on HTML documents. Since both dart:html classes Document and
+      // HtmlDocument share the same type, we must patch the instances and not
+      // the prototype.
+      if (!!o.xmlVersion) return "!Document";
+      return "!HTMLDocument";
+    }
+    return tag;
+  }
+
+  function prototypeForTagFixed(tag) {
+    if (tag == "Document") return null;  // Do not pre-patch Document.
+    return prototypeForTag(tag);
+  }
+
+  hooks.getTag = getTagFixed;
+  hooks.prototypeForTag = prototypeForTagFixed;
+}''');
 
 const _firefoxHooksTransformer = const JS_CONST(r'''
 function(hooks) {
   var userAgent = typeof navigator == "object" ? navigator.userAgent : "";
   if (userAgent.indexOf("Firefox") == -1) return hooks;
 
   var getTag = hooks.getTag;
 
   var quickMap = {
     "BeforeUnloadEvent": "Event",
@@ skipping 19 matching lines @@
 const _safariHooksTransformer = const JS_CONST(r'''
 function(hooks) { return hooks; }
 ''');
 
 
 const _dartExperimentalFixupGetTagHooksTransformer = const JS_CONST(r'''
 function(hooks) {
   if (typeof dartExperimentalFixupGetTag != "function") return hooks;
   hooks.getTag = dartExperimentalFixupGetTag(hooks.getTag);
 }''');