[WIP] RSS 1.0 support

analysis_options.yaml

@@ -1,7 +1,5 @@
 analyzer:
   language:
-    enablePreviewDart2: true
-  strong-mode: true
   errors:
     unused_import: error
     unused_local_variable: error

lib/domain/rss1_feed.dart

@@ -0,0 +1,38 @@
+import 'dart:core';
+
+import 'package:webfeed/domain/rss1_item.dart';
+import 'package:webfeed/util/helpers.dart';
+import 'package:xml/xml.dart';
+
+class Rss1Feed {
+  final String title;
+  final String description;
+  final String link;
+  final List<Rss1Item> items;
+
+  Rss1Feed({
+    this.title,
+    this.description,
+    this.link,
+    this.items,
+  });
+
+  factory Rss1Feed.parse(String xmlString) {
+    var document = parse(xmlString);
+    XmlElement rdfElement;
+    try {
+      rdfElement = document.findAllElements("rdf:RDF").first;
+    } on StateError {
+      throw ArgumentError("channel not found");
+    }
+
+    return Rss1Feed(
+      title: findElementOrNull(rdfElement, "title")?.text,
+      link: findElementOrNull(rdfElement, "link")?.text,
+      description: findElementOrNull(rdfElement, "description")?.text,
+      items: rdfElement.findElements("item").map((element) {
+        return Rss1Item.parse(element);
+      }).toList(),
+    );
+  }
+}

lib/domain/rss1_item.dart

@@ -0,0 +1,41 @@
+import 'package:webfeed/util/helpers.dart';
+import 'package:xml/xml.dart';
+
+class Rss1Item {
+  final String title;
+  final String description;
+  final String link;
+  final List<String> subjects;
+  final String creator;
+  final DateTime date;
+
+  Rss1Item({
+    this.title,
+    this.description,
+    this.link,
+    this.subjects,
+    this.creator,
+    this.date,
+  });
+
+  static DateTime _dateTimeBuilder(String dateTimeStringOrNull) {
+    if (dateTimeStringOrNull == null) {
+      return null;
+    }
+    return DateTime.parse(dateTimeStringOrNull);
+  }
+
+  factory Rss1Item.parse(XmlElement element) {
+    return Rss1Item(
+      title: findElementOrNull(element, "title")?.text,
+      description: findElementOrNull(element, "description")?.text,
+      link: findElementOrNull(element, "link")?.text,
+      subjects: element
+          .findAllElements('dc:subject')
+          .map((subject) => subject.text)
+          .toList(),
+      creator: findElementOrNull(element, 'dc:creator')?.text,
+      date: _dateTimeBuilder(findElementOrNull(element, 'dc:date')?.text),
+    );
+  }
+}

test/rss1_test.dart

@@ -0,0 +1,30 @@
+import 'dart:core';
+import 'dart:io';
+
+import 'package:test/test.dart';
+import 'package:webfeed/domain/rss1_feed.dart';
+
+void main() {
+  test("parse RSS1.xml", () {
+    var xmlString = new File("test/xml/RSS1.xml").readAsStringSync();
+
+    var feed = new Rss1Feed.parse(xmlString);
+
+    expect(feed.title, 'sampleのはてなブックマーク');
+    expect(feed.link, 'https://b.hatena.ne.jp/sample/bookmark');
+    expect(feed.description, 'sampleのはてなブックマーク (17)');
+
+    expect(feed.items.length, 17);
+
+    final firstItem = feed.items.first;
+
+    expect(firstItem.description, '');
+    expect(firstItem.title, 'はてなスタッフのブックマーク拝見！ - 営業マン編「仕事の様々なシーンでフル活用」');
+    expect(firstItem.link, 'http://b.hatena.ne.jp/guide/staff_bookmark_03');
+    expect(firstItem.creator, 'sample');
+    expect(firstItem.date, DateTime.parse('2009-04-10T09:44:20Z'));
+    expect(firstItem.subjects[0], 'はてな');
+    expect(firstItem.subjects[1], 'インタビュー');
+    expect(firstItem.subjects[2], 'はてなブックマーク');
+  });
+}