| // 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.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; |
| |
| HtmlRenderer(); |
| |
| String render(List<Node> nodes) { |
| buffer = new StringBuffer(); |
| |
| for (final node in nodes) node.accept(this); |
| |
| return buffer.toString(); |
| } |
| |
| void visitText(Text text) { |
| buffer.write(text.text); |
| } |
| |
| bool visitElementBefore(Element element) { |
| // Hackish. Separate block-level elements with newlines. |
| if (!buffer.isEmpty && |
| _BLOCK_TAGS.firstMatch(element.tag) != null) { |
| buffer.write('\n'); |
| } |
| |
| buffer.write('<${element.tag}'); |
| |
| // Sort the keys so that we generate stable output. |
| // TODO(rnystrom): This assumes keys returns a fresh mutable |
| // collection. |
| final attributeNames = element.attributes.keys.toList(); |
| attributeNames.sort((a, b) => a.compareTo(b)); |
| for (final name in attributeNames) { |
| buffer.write(' $name="${element.attributes[name]}"'); |
| } |
| |
| if (element.isEmpty) { |
| // Empty element like <hr/>. |
| buffer.write(' />'); |
| return false; |
| } else { |
| buffer.write('>'); |
| return true; |
| } |
| } |
| |
| void visitElementAfter(Element element) { |
| buffer.write('</${element.tag}>'); |
| } |
| } |