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Side by Side Diff: samples/markdown/html_renderer.dart

Issue 11238035: Make isEmpty a getter. (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: Update status file with co19 issue number. Created 8 years, 1 month ago
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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 const _BLOCK_TAGS = const RegExp( 9 static const _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');
11 11
12 StringBuffer buffer; 12 StringBuffer buffer;
13 13
14 HtmlRenderer(); 14 HtmlRenderer();
15 15
16 String render(List<Node> nodes) { 16 String render(List<Node> nodes) {
17 buffer = new StringBuffer(); 17 buffer = new StringBuffer();
18 18
19 for (final node in nodes) node.accept(this); 19 for (final node in nodes) node.accept(this);
20 20
21 return buffer.toString(); 21 return buffer.toString();
22 } 22 }
23 23
24 void visitText(Text text) { 24 void visitText(Text text) {
25 buffer.add(text.text); 25 buffer.add(text.text);
26 } 26 }
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 for (final name in element.attributes.getKeys()) {
38 buffer.add(' $name="${element.attributes[name]}"'); 38 buffer.add(' $name="${element.attributes[name]}"');
39 } 39 }
40 40
41 if (element.isEmpty) { 41 if (element.isEmpty) {
42 // Empty element like <hr/>. 42 // Empty element like <hr/>.
43 buffer.add(' />'); 43 buffer.add(' />');
44 return false; 44 return false;
45 } else { 45 } else {
46 buffer.add('>'); 46 buffer.add('>');
47 return true; 47 return true;
48 } 48 }
49 } 49 }
50 50
51 void visitElementAfter(Element element) { 51 void visitElementAfter(Element element) {
52 buffer.add('</${element.tag}>'); 52 buffer.add('</${element.tag}>');
53 } 53 }
54 } 54 }
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