pkg/docgen: update markdown to 0.5.1

third_party/pkg/markdown/lib/src/html_renderer.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 markdown;
+library markdown.html_renderer;
+
+import 'ast.dart';
+import 'document.dart';
+
+/// Converts the given string of markdown to HTML.
+String markdownToHtml(String markdown, {inlineSyntaxes, linkResolver,
+    bool inlineOnly: false}) {
+  var document = new Document(inlineSyntaxes: inlineSyntaxes,
+      linkResolver: linkResolver);
+
+  if (inlineOnly) {
+    return renderToHtml(document.parseInline(markdown));
+  } else {
+    // Replace windows line endings with unix line endings, and split.
+    var lines = markdown.replaceAll('\r\n','\n').split('\n');
+    document.parseRefLinks(lines);
+    var blocks = document.parseLines(lines);
+    return renderToHtml(blocks);
+  }
+}
 
 String renderToHtml(List<Node> nodes) => new HtmlRenderer().render(nodes);
 
 /// Translates a parsed AST to HTML.
 class HtmlRenderer implements NodeVisitor {
   static final _BLOCK_TAGS = new RegExp(
       'blockquote|h1|h2|h3|h4|h5|h6|hr|p|pre');
 
   StringBuffer buffer;
 
@@ skipping 36 matching lines @@
     } else {
       buffer.write('>');
       return true;
     }
   }
 
   void visitElementAfter(Element element) {
     buffer.write('</${element.tag}>');
   }
 }