add author, source & comments into rss_item

lib/domain/rss_item.dart

@@ -1,4 +1,5 @@
 import 'package:webfeedclient/domain/rss_category.dart';
+import 'package:webfeedclient/domain/rss_source.dart';
 import 'package:webfeedclient/util/helpers.dart';
 import 'package:xml/xml.dart';
 
@@ -10,8 +11,12 @@ class RssItem {
   final List<RssCategory> categories;
   final String guid;
   final String pubDate;
+  final String author;
+  final String comments;
+  final RssSource source;
 
-  RssItem(this.title, this.description, this.link, {this.categories, this.guid, this.pubDate});
+  RssItem(this.title, this.description, this.link,
+      {this.categories, this.guid, this.pubDate, this.author, this.comments, this.source});
 
   factory RssItem.parse(XmlElement element) {
     var title = xmlGetString(element, "title");
@@ -24,8 +29,16 @@ class RssItem {
 
     var guid = xmlGetString(element, "guid", strict: false);
     var pubDate = xmlGetString(element, "pubDate", strict: false);
+    var author = xmlGetString(element, "author", strict: false);
+    var comments = xmlGetString(element, "comments", strict: false);
 
-    return new RssItem(title, description, link, categories: categories, guid: guid, pubDate: pubDate);
+    RssSource source;
+    try {
+      source = new RssSource.parse(element.findElements("source").first);
+    } on StateError {}
+
+    return new RssItem(title, description, link,
+        categories: categories, guid: guid, pubDate: pubDate, author: author, comments: comments, source: source);
   }
 
   @override
@@ -34,7 +47,11 @@ class RssItem {
       title: $title
       description: $description
       link: $link
+      guid: $guid
       pubDate: $pubDate
+      author: $author
+      comments: $comments
+      source: $source
     ''';
   }
 }

lib/domain/rss_source.dart

@@ -0,0 +1,23 @@
+import 'package:xml/xml/nodes/element.dart';
+
+class RssSource {
+  String url;
+  String value;
+
+  RssSource(this.url, this.value);
+
+  factory RssSource.parse(XmlElement node) {
+    var url = node.getAttribute("url");
+    var value = node.text;
+
+    return new RssSource(url, value);
+  }
+
+  @override
+  String toString() {
+    return '''
+      url: $url
+      value: $value
+    ''';
+  }
+}

test/rss_test.dart

@@ -68,5 +68,9 @@ void main() {
     expect(feed.items.first.pubDate, "Mon, 26 Mar 2018 14:00:00 PDT");
     expect(feed.items.first.categories.first.domain, "news");
     expect(feed.items.first.categories.first.value, "Lorem");
+    expect(feed.items.first.author, "alice@foo.bar.news");
+    expect(feed.items.first.source.url, "https://foo.bar.news/1?source");
+    expect(feed.items.first.source.value, "Foo Bar");
+    expect(feed.items.first.comments, "https://foo.bar.news/1/comments");
   });
 }

test/xml/RSS.xml

@@ -41,6 +41,9 @@
             <description>Lorem ipsum dolor sit amet, consectetur adipiscing elit</description>
             <category domain="news">Lorem</category>
             <pubDate>Mon, 26 Mar 2018 14:00:00 PDT</pubDate>
+            <author>alice@foo.bar.news</author>
+            <source url="https://foo.bar.news/1?source">Foo Bar</source>
+            <comments>https://foo.bar.news/1/comments</comments>
         </item>
         <item>
             <title>Section 1.10.32 of "de Finibus Bonorum et Malorum", written by Cicero in 45 BC</title>
@@ -51,6 +54,9 @@
             </description>
             <category domain="auto">Ipsum</category>
             <pubDate>Tue, 20 Mar 2018 10:00:00 PDT</pubDate>
+            <author>bob@foo.bar.news</author>
+            <source url="https://foo.bar.news/2?source">Lorem Ipsum</source>
+            <comments>https://foo.bar.news/2/comments</comments>
         </item>
     </channel>
 </rss>