make public the html element names map

pkg/polymer/bin/new_element.dart

 /// 
 /// Script to create boilerplate for a Polymer element.
 /// Produces .dart and .html files for the element.
 /// 
 /// Run this script with pub run:
 /// 
 ///     pub run polymer:new_element element-name [-o output_dir]
 /// 
 import 'dart:io';
 import 'package:args/args.dart';
 import 'package:path/path.dart' as path show absolute, dirname, join, split;
+import 'package:polymer/html_element_names.dart';
 
 void printUsage(ArgParser parser) {
   print('pub run polymer:new_element [-o output_dir] [-e super-element] '
         'element-name');
   print(parser.getUsage());
 }
 
 void main(List<String> args) {
   var parser = new ArgParser(allowTrailingOptions: true);
   
@@ skipping 97 matching lines @@
 String _findDirWithFile(String dir, String filename) {
   while (!new File(path.join(dir, filename)).existsSync()) {
     var parentDir = path.dirname(dir);
     // If we reached root and failed to find it, bail.
     if (parentDir == dir) return null;
     dir = parentDir;
   }
   return dir;
 }
 
-bool _isDOMElement(String element) => (_htmlElementNames[element] != null);
+bool _isDOMElement(String element) => (HTML_ELEMENT_NAMES[element] != null);
 
 bool _isPolymerElement(String element) {
   return element.contains('-') && (element.toLowerCase() == element);
 }
 
 String _toCamelCase(String s) {
   return s[0].toUpperCase() + s.substring(1);
 }
 
 void _createBoilerPlate(String element, String superClass, String directory,
@@ skipping 20 matching lines @@
         superClass.split('-').map((e) => _toCamelCase(e)).join('');
     classDeclaration = 'class $capitalizedName extends $camelSuperClass {';
     extendsElementString = ' extends="$superClass"';
     shadowString = 
         '\n    <!-- Render extended element\'s Shadow DOM here -->\n'
         '    <shadow>\n    </shadow>';
   } else {
     // The element being extended is a DOM Class.
     importDartHtml = "import 'dart:html';\n";
     classDeclaration = 
-        'class $capitalizedName extends ${_htmlElementNames[superClass]} '
+        'class $capitalizedName extends ${HTML_ELEMENT_NAMES[superClass]} '
         'with Polymer, Observable {';
     polymerCreatedString = '\n    polymerCreated();';
     extendsElementString = ' extends="$superClass"';
   }
 
   String html = '''  
 <!-- import polymer-element's definition -->
 <link rel="import" href="${pathToPackages}packages/polymer/polymer.html">
 
 <polymer-element name="$element"$extendsElementString>
@@ skipping 54 matching lines @@
 }
 ''';
 
   String dartFile = path.join(directory, underscoreName + '.dart');
   new File(dartFile).writeAsStringSync(dart);
   
   print('Successfully created:');
   print('  ' + path.absolute(path.join(directory, underscoreName + '.dart')));
   print('  ' + path.absolute(path.join(directory, underscoreName + '.html')));
 }
-
-/**
- * HTML element to DOM type mapping. Source:
- * <http://dev.w3.org/html5/spec/section-index.html#element-interfaces>
- *
- * The 'HTML' prefix has been removed to match `dart:html`, as per:
- * <http://code.google.com/p/dart/source/browse/branches/bleeding_edge/dart/lib/html/scripts/htmlrenamer.py>
- * It does not appear any element types are being renamed other than the prefix.
- * However there does not appear to be the last subtypes for the following tags:
- * command, data, dialog, td, th, and time.
- */
-const _htmlElementNames = const {
-  'a': 'AnchorElement',
-  'abbr': 'Element',
-  'address': 'Element',
-  'area': 'AreaElement',
-  'article': 'Element',
-  'aside': 'Element',
-  'audio': 'AudioElement',
-  'b': 'Element',
-  'base': 'BaseElement',
-  'bdi': 'Element',
-  'bdo': 'Element',
-  'blockquote': 'QuoteElement',
-  'body': 'BodyElement',
-  'br': 'BRElement',
-  'button': 'ButtonElement',
-  'canvas': 'CanvasElement',
-  'caption': 'TableCaptionElement',
-  'cite': 'Element',
-  'code': 'Element',
-  'col': 'TableColElement',
-  'colgroup': 'TableColElement',
-  'command': 'Element', // see doc comment, was: 'CommandElement'
-  'data': 'Element', // see doc comment, was: 'DataElement'
-  'datalist': 'DataListElement',
-  'dd': 'Element',
-  'del': 'ModElement',
-  'details': 'DetailsElement',
-  'dfn': 'Element',
-  'dialog': 'Element', // see doc comment, was: 'DialogElement'
-  'div': 'DivElement',
-  'dl': 'DListElement',
-  'dt': 'Element',
-  'em': 'Element',
-  'embed': 'EmbedElement',
-  'fieldset': 'FieldSetElement',
-  'figcaption': 'Element',
-  'figure': 'Element',
-  'footer': 'Element',
-  'form': 'FormElement',
-  'h1': 'HeadingElement',
-  'h2': 'HeadingElement',
-  'h3': 'HeadingElement',
-  'h4': 'HeadingElement',
-  'h5': 'HeadingElement',
-  'h6': 'HeadingElement',
-  'head': 'HeadElement',
-  'header': 'Element',
-  'hgroup': 'Element',
-  'hr': 'HRElement',
-  'html': 'HtmlElement',
-  'i': 'Element',
-  'iframe': 'IFrameElement',
-  'img': 'ImageElement',
-  'input': 'InputElement',
-  'ins': 'ModElement',
-  'kbd': 'Element',
-  'keygen': 'KeygenElement',
-  'label': 'LabelElement',
-  'legend': 'LegendElement',
-  'li': 'LIElement',
-  'link': 'LinkElement',
-  'map': 'MapElement',
-  'mark': 'Element',
-  'menu': 'MenuElement',
-  'meta': 'MetaElement',
-  'meter': 'MeterElement',
-  'nav': 'Element',
-  'noscript': 'Element',
-  'object': 'ObjectElement',
-  'ol': 'OListElement',
-  'optgroup': 'OptGroupElement',
-  'option': 'OptionElement',
-  'output': 'OutputElement',
-  'p': 'ParagraphElement',
-  'param': 'ParamElement',
-  'pre': 'PreElement',
-  'progress': 'ProgressElement',
-  'q': 'QuoteElement',
-  'rp': 'Element',
-  'rt': 'Element',
-  'ruby': 'Element',
-  's': 'Element',
-  'samp': 'Element',
-  'script': 'ScriptElement',
-  'section': 'Element',
-  'select': 'SelectElement',
-  'small': 'Element',
-  'source': 'SourceElement',
-  'span': 'SpanElement',
-  'strong': 'Element',
-  'style': 'StyleElement',
-  'sub': 'Element',
-  'summary': 'Element',
-  'sup': 'Element',
-  'table': 'TableElement',
-  'tbody': 'TableSectionElement',
-  'td': 'TableCellElement', // see doc comment, was: 'TableDataCellElement'
-  'template': 'Element', // should be 'TemplateElement', but it is not yet
-                         // in dart:html
-  'textarea': 'TextAreaElement',
-  'tfoot': 'TableSectionElement',
-  'th': 'TableCellElement', // see doc comment, was: 'TableHeaderCellElement'
-  'thead': 'TableSectionElement',
-  'time': 'Element', // see doc comment, was: 'TimeElement'
-  'title': 'TitleElement',
-  'tr': 'TableRowElement',
-  'track': 'TrackElement',
-  'u': 'Element',
-  'ul': 'UListElement',
-  'var': 'Element',
-  'video': 'VideoElement',
-  'wbr': 'Element',
-};