Replace bootstrap logic with 'boot.js', use 'component/dart' mime-type and add

pkg/polymer/lib/src/build/linter.dart

 // Copyright (c) 2013, 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.
 
 /// Logic to validate that developers are correctly using Polymer constructs.
 /// This is mainly used to produce warnings for feedback in the editor.
 library polymer.src.build.linter;
 
 import 'dart:async';
 
@@ skipping 122 matching lines @@
 
   _ElementSummary(this.tagName, this.extendsTag, this.span);
 
   String toString() => "($tagName <: $extendsTag)";
 }
 
 class _LinterVisitor extends TreeVisitor {
   TransformLogger _logger;
   bool _inPolymerElement = false;
   bool _dartTagSeen = false;
+  bool _polymerHtmlSeen = false;
   bool _isEntrypoint;
   Map<String, _ElementSummary> _elements;
 
   _LinterVisitor(this._logger, this._elements, this._isEntrypoint) {
     // We normalize the map, so each element has a direct reference to any
     // element it extends from.
     for (var tag in _elements.values) {
       var extendsTag = tag.extendsTag;
       if (extendsTag == null) continue;
       tag.extendsType = _elements[extendsTag];
     }
   }
 
   void visitElement(Element node) {
     switch (node.localName) {
       case 'link': _validateLinkElement(node); break;
       case 'element': _validateElementElement(node); break;
       case 'polymer-element': _validatePolymerElement(node); break;
       case 'script': _validateScriptElement(node); break;
       default:
          _validateNormalElement(node);
          super.visitElement(node);
          break;
     }
   }
 
   void run(Document doc) {
     visit(doc);
 
-    if (_isEntrypoint && !_dartTagSeen) {
-      _logger.error(USE_INIT_DART, span: doc.body.sourceSpan);
+    if (_isEntrypoint && !_polymerHtmlSeen) {
+      _logger.warning(USE_POLYMER_HTML, span: doc.body.sourceSpan);
     }
   }
 
   /// Produce warnings for invalid link-rel tags.
   void _validateLinkElement(Element node) {
     var rel = node.attributes['rel'];
     if (rel != 'import' && rel != 'stylesheet') return;
 
     if (rel == 'import' && _dartTagSeen) {
       _logger.warning(
           "Move HTML imports above your Dart script tag.",
           span: node.sourceSpan);
     }
 
     var href = node.attributes['href'];
-    if (href != null && href != '') return;
+    if (href == null || href == '') {
+      _logger.warning('link rel="$rel" missing href.', span: node.sourceSpan);
+      return;
+    }
 
+    if (href == 'packages/polymer/polymer.html') {
+      _polymerHtmlSeen = true;
+    }
     // TODO(sigmund): warn also if href can't be resolved.
-    _logger.warning('link rel="$rel" missing href.', span: node.sourceSpan);
   }
 
   /// Produce warnings if using `<element>` instead of `<polymer-element>`.
   void _validateElementElement(Element node) {
     _logger.warning('<element> elements are not supported, use'
         ' <polymer-element> instead', span: node.sourceSpan);
   }
 
   /// Produce warnings if using `<polymer-element>` in the wrong place or if the
   /// definition is not complete.
@@ skipping 35 matching lines @@
     }
 
     var oldValue = _inPolymerElement;
     _inPolymerElement = true;
     super.visitElement(node);
     _inPolymerElement = oldValue;
   }
 
   /// Checks for multiple Dart script tags in the same page, which is invalid.
   void _validateScriptElement(Element node) {
-    var scriptType = node.attributes['type'];
-    var isDart = scriptType == 'application/dart';
     var src = node.attributes['src'];
-
-    if (isDart) {
-      if (_dartTagSeen) {
-        _logger.warning('Only one "application/dart" script tag per document '
-            'is allowed.', span: node.sourceSpan);
-      }
-      _dartTagSeen = true;
-    }
-
     if (src == null) return;
-
-    if (src == 'packages/polymer/boot.js') {
-      _logger.warning(BOOT_JS_DEPRECATED, span: node.sourceSpan);
-      return;
-    }
+    var type = node.attributes['type'];
+    bool isDart = type == 'application/dart;component=1' ||
+        type == 'application/dart';
 
     if (src.endsWith('.dart') && !isDart) {
-      _logger.warning('Wrong script type, expected type="application/dart".',
-          span: node.sourceSpan);
+      _logger.warning('Wrong script type, expected type="application/dart" '
+          'or type="application/dart;component=1".', span: node.sourceSpan);
       return;
     }
 
     if (!src.endsWith('.dart') && isDart) {
-      _logger.warning('"application/dart" scripts should '
-          'use the .dart file extension.',
+      _logger.warning('"$type" scripts should use the .dart file extension.',
           span: node.sourceSpan);
       return;
     }
 
     if (node.innerHtml.trim() != '') {
       _logger.warning('script tag has "src" attribute and also has script '
           'text.', span: node.sourceSpan);
     }
   }
 
@@ skipping 92 matching lines @@
 
     if (value.contains('(')) {
       _logger.warning('Invalid event handler body "$value". Declare a method '
           'in your custom element "void handlerName(event, detail, target)" '
           'and use the form $name="handlerName".',
           span: node.attributeSpans[name]);
     }
   }
 }
 
-const String USE_INIT_DART =
-    'To run a polymer application, you need to call "initPolymer". You can '
-    'either include a generic script tag that does this for you:'
-    '\'<script type="application/dart">export "package:polymer/init.dart";'
-    '</script>\' or add your own script tag and call that function. '
-    'Make sure the script tag is placed after all HTML imports.';
+const String USE_POLYMER_HTML =
+    'To run a polymer application you need to include the following HTML '
+    'import: <link rel="import" href="packages/polymer/polymer.html">. This '
+    'will include the common polymer logic needed to boostrap your '
+    'application. The old style of initializing polymer with boot.js or '
+    'initPolymer are now deprecated. ';
 
-const String BOOT_JS_DEPRECATED =
-    '"boot.js" is now deprecated. Instead, you can initialize your polymer '
-    'application by calling "initPolymer()" in your main. If you don\'t have a '
-    'main, then you can include our generic main by adding the following '
-    'script tag to your page: \'<script type="application/dart">export '
-    '"package:polymer/init.dart";</script>\'. Additionally you need to '
-    'include: \'<script src="packages/browser/dart.js"></script>\' in the page '
-    'too. Make sure these script tags come after all HTML imports.';