| // 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; |
| |
| String renderToHtml(List<Node> nodes) => new HtmlRenderer().render(nodes); |
| |
| /// Translates a parsed AST to HTML. |
| class HtmlRenderer implements NodeVisitor { |
| static const _BLOCK_TAGS = const 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.add(text.text); |
| } |
| |
| bool visitElementBefore(Element element) { |
| // Hackish. Separate block-level elements with newlines. |
| if (!buffer.isEmpty && |
| _BLOCK_TAGS.firstMatch(element.tag) != null) { |
| buffer.add('\n'); |
| } |
| |
| buffer.add('<${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; |
| attributeNames.sort((a, b) => a.compareTo(b)); |
| for (final name in attributeNames) { |
| buffer.add(' $name="${element.attributes[name]}"'); |
| } |
| |
| if (element.isEmpty) { |
| // Empty element like <hr/>. |
| buffer.add(' />'); |
| return false; |
| } else { |
| buffer.add('>'); |
| return true; |
| } |
| } |
| |
| void visitElementAfter(Element element) { |
| buffer.add('</${element.tag}>'); |
| } |
| } |