[html5lib] api updates: localName

pkg/third_party/html5lib/lib/dom_parsing.dart

 /// This library contains extra APIs that aren't in the DOM, but are useful
 /// when interacting with the parse tree.
 library dom_parsing;
 
 import 'dom.dart';
+import 'src/constants.dart' show rcdataElements;
 
 /// A simple tree visitor for the DOM nodes.
 class TreeVisitor {
   visit(Node node) {
     switch (node.nodeType) {
       case Node.ELEMENT_NODE: return visitElement(node);
       case Node.TEXT_NODE: return visitText(node);
       case Node.COMMENT_NODE: return visitComment(node);
       case Node.DOCUMENT_FRAGMENT_NODE: return visitDocumentFragment(node);
       case Node.DOCUMENT_NODE: return visitDocument(node);
@@ skipping 44 matching lines @@
 
   String toString() => _str.toString();
 
   visitDocument(Document node) {
     _str.write("<pre>");
     visitChildren(node);
     _str.write("</pre>");
   }
 
   visitDocumentType(DocumentType node) {
-    _str.write('<code class="markup doctype">&lt;!DOCTYPE ${node.tagName}>'
+    _str.write('<code class="markup doctype">&lt;!DOCTYPE ${node.name}>'
         '</code>');
   }
 
   visitText(Text node) {
-    // TODO(jmesserly): would be nice to use _addOuterHtml directly.
-    _str.write(node.outerHtml);
+    writeTextNodeAsHtml(_str, node);
   }
 
   visitElement(Element node) {
-    _str.write('&lt;<code class="markup element-name">${node.tagName}</code>');
+    final tag = node.localName;
+    _str.write('&lt;<code class="markup element-name">$tag</code>');
     if (node.attributes.length > 0) {
       node.attributes.forEach((key, v) {
         v = htmlSerializeEscape(v, attributeMode: true);
         _str.write(' <code class="markup attribute-name">$key</code>'
             '=<code class="markup attribute-value">"$v"</code>');
       });
     }
     if (node.nodes.length > 0) {
       _str.write(">");
       visitChildren(node);
-    } else if (isVoidElement(node.tagName)) {
+    } else if (isVoidElement(tag)) {
       _str.write(">");
       return;
     }
     _str.write(
-        '&lt;/<code class="markup element-name">${node.tagName}</code>>');
+        '&lt;/<code class="markup element-name">$tag</code>>');
   }
 
   visitComment(Comment node) {
     var data = htmlSerializeEscape(node.data);
     _str.write('<code class="markup comment">&lt;!--${data}--></code>');
   }
 }
 
 
 // TODO(jmesserly): reconcile this with dart:web htmlEscape.
@@ skipping 46 matching lines @@
 bool isVoidElement(String tagName) {
   switch (tagName) {
     case "area": case "base": case "br": case "col": case "command":
     case "embed": case "hr": case "img": case "input": case "keygen":
     case "link": case "meta": case "param": case "source": case "track":
     case "wbr":
       return true;
   }
   return false;
 }
+
+/// Serialize text node according to:
+/// <http://www.whatwg.org/specs/web-apps/current-work/multipage/the-end.html#html-fragment-serialization-algorithm>
+void writeTextNodeAsHtml(StringBuffer str, Text node) {
+  // Don't escape text for certain elements, notably <script>.
+  final parent = node.parent;
+  if (parent is Element) {
+    var tag = parent.localName;
+    if (rcdataElements.contains(tag) || tag == 'plaintext') {
+      str.write(node.data);
+      return;
+    }
+  }
+  str.write(htmlSerializeEscape(node.data));
+}