Added support for RSS content module `http://purl.org/rss/1.0/modules/content/`

lib/domain/rss_content.dart

@@ -0,0 +1,35 @@
+import 'package:xml/xml/nodes/element.dart';
+
+final _imagesRegExp = new RegExp(
+  "<img\\s.*?src=(?:'|\")([^'\">]+)(?:'|\")",
+  multiLine: true,
+  caseSensitive: false,
+);
+
+/// For RSS Content Module:
+///
+/// - `xmlns:content="http://purl.org/rss/1.0/modules/content/"`
+///
+class RssContent {
+  String value;
+  Iterable<String> images;
+
+  RssContent(this.value, this.images);
+
+  factory RssContent.parse(XmlElement node) {
+    final content = node.text;
+    final images = <String>[];
+    _imagesRegExp.allMatches(content).forEach((match) {
+      images.add(match.group(1));
+    });
+    return new RssContent(content, images);
+  }
+
+  @override
+  String toString() {
+    return '''
+      content: $value
+      images: $images
+    ''';
+  }
+}

lib/domain/rss_item.dart

@@ -1,4 +1,5 @@
 import 'package:webfeed/domain/rss_category.dart';
+import 'package:webfeed/domain/rss_content.dart';
 import 'package:webfeed/domain/rss_source.dart';
 import 'package:webfeed/util/helpers.dart';
 import 'package:xml/xml.dart';
@@ -14,9 +15,20 @@ class RssItem {
   final String author;
   final String comments;
   final RssSource source;
+  final RssContent content;
 
-  RssItem(this.title, this.description, this.link,
-      {this.categories, this.guid, this.pubDate, this.author, this.comments, this.source});
+  RssItem(
+    this.title,
+    this.description,
+    this.link, {
+    this.categories,
+    this.guid,
+    this.pubDate,
+    this.author,
+    this.comments,
+    this.source,
+    this.content,
+  });
 
   factory RssItem.parse(XmlElement element) {
     var title = xmlGetString(element, "title");
@@ -37,8 +49,23 @@ class RssItem {
       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);
+    RssContent content;
+    try {
+      content = new RssContent.parse(element.findElements("content:encoded").first);
+    } on StateError {}
+
+    return new RssItem(
+      title,
+      description,
+      link,
+      categories: categories,
+      guid: guid,
+      pubDate: pubDate,
+      author: author,
+      comments: comments,
+      source: source,
+      content: content,
+    );
   }
 
   @override
@@ -52,6 +79,7 @@ class RssItem {
       author: $author
       comments: $comments
       source: $source
+      content: $content
     ''';
   }
 }

test/rss_test.dart

@@ -72,5 +72,8 @@ void main() {
     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");
+
+    expect(feed.items.first.content.value, "<img width=\"1000\" height=\"690\" src=\"https://test.com/image_link\"/> Test content<br />");
+    expect(feed.items.first.content.images.first, "https://test.com/image_link");
   });
 }

test/xml/RSS.xml

@@ -1,5 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<rss version="2.0">
+<rss version="2.0"
+     xmlns:content="http://purl.org/rss/1.0/modules/content/">
+
     <channel>
         <title>News - Foo bar News</title>
         <link>https://foo.bar.news/</link>
@@ -44,6 +46,7 @@
             <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>
+            <content:encoded><![CDATA[<img width="1000" height="690" src="https://test.com/image_link"/> Test content<br />]]></content:encoded>
         </item>
         <item>
             <title>Section 1.10.32 of "de Finibus Bonorum et Malorum", written by Cicero in 45 BC</title>