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+/**
+ * Copyright 2009 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS-IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import("stringutils.sprintf");
+
+// TODO: validate XHTML of entries?
+
+function _xmlDate(d) {
+ return sprintf("%04d-%02d-%02dT%02d:%02d:%02dZ",
+ d.getUTCFullYear(), d.getUTCMonth()+1, d.getUTCDate(),
+ d.getUTCHours(), d.getUTCMinutes(), d.getUTCSeconds());
+}
+
+// "entries" is an object with "forEach" member (an Array works).
+// Each entry should have these properties:
+// * title
+// * author
+// * published (Date)
+// * updated (Date)
+// * href (URL for HTML version)
+// * content (valid xhtml)
+//
+// NOTE: entries should be sorted descending by entry.updated (newest first)
+//
+
+function renderFeed(title, lastUpdated, entries, href) {
+ function ampesc(url) {
+ return url.replace(/&/g, '&');
+ }
+
+ var r = [];
+ r.push('<?xml version="1.0" encoding="utf-8"?>',
+ '<feed xmlns="http://www.w3.org/2005/Atom">');
+
+ r.push('<title type="text">' + title + '</title>');
+ r.push('<updated>' + _xmlDate(lastUpdated) + '</updated>');
+ r.push('<link rel="self" href="' + request.url + '" />');
+ r.push('<link rel="alternate" type="text/html" href="' + href + '" />');
+ r.push('<id>' + ampesc(request.url) + '</id>');
+
+ entries.forEach(function(entry) {
+ r.push('<entry>',
+ '<title>' + entry.title + '</title>',
+ '<author><name>' + entry.author + '</name></author>',
+ '<published>' + _xmlDate(entry.published) + '</published>',
+ '<updated>' + _xmlDate(entry.updated) + '</updated>',
+ '<link rel="alternate" type="text/html" href="' + entry.href + '" />',
+ '<id>'+ampesc(entry.href)+'</id>',
+ '<content type="xhtml">',
+ '<div xmlns="http://www.w3.org/1999/xhtml">'+entry.content+'</div>',
+ '</content>',
+ '</entry>');
+ });
+
+ r.push('</feed>');
+
+ return r.join('\n');
+}
+