pkg/docgen: update markdown to 0.5.1

third_party/pkg/markdown/lib/src/document.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.
+library markdown.document;
 
-/// Parses text in a markdown-like format and renders to HTML.
-library markdown;
-
-// TODO(rnystrom): Use "package:" URL (#4968).
-part 'src/markdown/ast.dart';
-part 'src/markdown/block_parser.dart';
-part 'src/markdown/html_renderer.dart';
-part 'src/markdown/inline_parser.dart';
-
-typedef Node Resolver(String name);
-
-/// Converts the given string of markdown to HTML.
-String markdownToHtml(String markdown, {inlineSyntaxes, linkResolver}) {
-  final document = new Document(inlineSyntaxes: inlineSyntaxes,
-      linkResolver: linkResolver);
-
-  // Replace windows line endings with unix line endings, and split.
-  final lines = markdown.replaceAll('\r\n','\n').split('\n');
-  document.parseRefLinks(lines);
-  final blocks = document.parseLines(lines);
-  return renderToHtml(blocks);
-}
-
-/// Replaces `<`, `&`, and `>`, with their HTML entity equivalents.
-String escapeHtml(String html) {
-  return html.replaceAll('&', '&amp;')
-             .replaceAll('<', '&lt;')
-             .replaceAll('>', '&gt;');
-}
+import 'ast.dart';
+import 'block_parser.dart';
+import 'inline_parser.dart';
 
 /// Maintains the context needed to parse a markdown document.
 class Document {
   final Map<String, Link> refLinks;
   List<InlineSyntax> inlineSyntaxes;
   Resolver linkResolver;
 
   Document({this.inlineSyntaxes, this.linkResolver})
     : refLinks = <String, Link>{};
 
@@ skipping 62 matching lines @@
   /// `<em>this <strong>is</strong> a</em> <code>markdown</code>`.
   List<Node> parseInline(String text) => new InlineParser(text, this).parse();
 }
 
 class Link {
   final String id;
   final String url;
   final String title;
   Link(this.id, this.url, this.title);
 }