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Unified Diff: pkg/barback/examples/markdown_converter/lib/transformer.dart

Issue 197533004: Adding barback examples. (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: Incorporating Nathan's feedback Created 6 years, 8 months ago
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Index: pkg/barback/examples/markdown_converter/lib/transformer.dart
diff --git a/pkg/barback/examples/markdown_converter/lib/transformer.dart b/pkg/barback/examples/markdown_converter/lib/transformer.dart
new file mode 100644
index 0000000000000000000000000000000000000000..22bff32dd55fb664381d3de15c41ce31166cea20
--- /dev/null
+++ b/pkg/barback/examples/markdown_converter/lib/transformer.dart
@@ -0,0 +1,33 @@
+// Copyright (c) 2014, 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.
+
+import 'package:barback/barback.dart';
+import 'package:markdown/markdown.dart';
+
+import 'dart:async';
+
+class ConvertMarkdown extends Transformer {
+
+ // A constructor named "asPlugin" is required. It can be empty, but
+ // it must be present. It is how pub determines that you want this
+ // class to be publicly available as a loadable transformer plugin.
+ ConvertMarkdown.asPlugin();
+
+ // Any markdown file with one of the following extensions is
+ // converted to HTML.
+ String get allowedExtensions => ".md .markdown .mdown";
+
+ Future apply(Transform transform) {
+ return transform.primaryInput.readAsString().then((content) {
+
+ // The extension of the output is changed to ".html".
+ var id = transform.primaryInput.id.changeExtension(".html");
+
+ String newContent = "<html><body>"
+ + markdownToHtml(content)
+ + "</body></html>";
+ transform.addOutput(new Asset.fromString(id, newContent));
+ });
+ }
+}

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