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1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 String renderToHtml(List<Node> nodes) => new HtmlRenderer().render(nodes); | 5 String renderToHtml(List<Node> nodes) => new HtmlRenderer().render(nodes); |
6 | 6 |
7 /// Translates a parsed AST to HTML. | 7 /// Translates a parsed AST to HTML. |
8 class HtmlRenderer implements NodeVisitor { | 8 class HtmlRenderer implements NodeVisitor { |
9 static final _BLOCK_TAGS = const RegExp( | 9 static final _BLOCK_TAGS = const RegExp( |
10 'blockquote|h1|h2|h3|h4|h5|h6|hr|p|pre'); | 10 'blockquote|h1|h2|h3|h4|h5|h6|hr|p|pre'); |
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27 | 27 |
28 bool visitElementBefore(Element element) { | 28 bool visitElementBefore(Element element) { |
29 // Hackish. Separate block-level elements with newlines. | 29 // Hackish. Separate block-level elements with newlines. |
30 if (!buffer.isEmpty() && | 30 if (!buffer.isEmpty() && |
31 _BLOCK_TAGS.firstMatch(element.tag) != null) { | 31 _BLOCK_TAGS.firstMatch(element.tag) != null) { |
32 buffer.add('\n'); | 32 buffer.add('\n'); |
33 } | 33 } |
34 | 34 |
35 buffer.add('<${element.tag}'); | 35 buffer.add('<${element.tag}'); |
36 | 36 |
37 for (final name in element.attributes.getKeys()) { | 37 // Sort the keys so that we generate stable output. |
| 38 // TODO(rnystrom): This assumes getKeys() returns a fresh mutable |
| 39 // collection. |
| 40 final attributeNames = element.attributes.getKeys(); |
| 41 attributeNames.sort((a, b) => a.compareTo(b)); |
| 42 for (final name in attributeNames) { |
38 buffer.add(' $name="${element.attributes[name]}"'); | 43 buffer.add(' $name="${element.attributes[name]}"'); |
39 } | 44 } |
40 | 45 |
41 if (element.isEmpty) { | 46 if (element.isEmpty) { |
42 // Empty element like <hr/>. | 47 // Empty element like <hr/>. |
43 buffer.add(' />'); | 48 buffer.add(' />'); |
44 return false; | 49 return false; |
45 } else { | 50 } else { |
46 buffer.add('>'); | 51 buffer.add('>'); |
47 return true; | 52 return true; |
48 } | 53 } |
49 } | 54 } |
50 | 55 |
51 void visitElementAfter(Element element) { | 56 void visitElementAfter(Element element) { |
52 buffer.add('</${element.tag}>'); | 57 buffer.add('</${element.tag}>'); |
53 } | 58 } |
54 } | 59 } |
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