private static IAuthor PopulateAuthor(XmlReader reader, FeedType feedType) {
string author = null;
string email = null;
if(feedType.Equals(FeedType.Rdf) || feedType.Equals(FeedType.Rss)) {
email = author = ReadElementString(reader);
}
if(feedType.Equals(FeedType.Atom)) {
int depth = reader.Depth;
while(reader.Read()) {
if(reader.NodeType.Equals(XmlNodeType.EndElement) && reader.Depth.Equals(depth)) {
break;
}
if(!reader.NodeType.Equals(XmlNodeType.Element)) {
continue;
}
if(!reader.IsEmptyElement) {
if(reader.LocalName.Equals("name")) {
author = ReadElementString(reader);
continue;
}
if(reader.LocalName.Equals("email")) {
email = ReadElementString(reader);
continue;
}
}
}
}
author = author ?? email;
if(author != null) {
return new Author(author, email);
}
return null;
}
private static IFeed PopulateFeed(Uri url, XmlReader reader, string namespaceUri, FeedType feedType, string language) {
List<IFeedItem> items = new List<IFeedItem>();
string link = null;
string selfLink = null;
string title = null;
string description = null;
string id = null;
IAuthor author = null;
DateTime channelBuildDate = DateTime.MinValue;
Dictionary<XmlQualifiedName, string> customElements = new Dictionary<XmlQualifiedName, string>();
bool nodeRead = false;
while(nodeRead || reader.Read()) {
nodeRead = false;
if(!reader.NodeType.Equals(XmlNodeType.Element)) {
continue;
}
if(reader.NamespaceURI.Equals(namespaceUri) || reader.NamespaceURI.Equals(String.Empty)) {
if(reader.LocalName.Equals("title")) {
if(!reader.IsEmptyElement) {
title = ReadElementString(reader);
}
continue;
}
if(feedType.Equals(FeedType.Rdf) || feedType.Equals(FeedType.Rss)) {
if(reader.IsEmptyElement) {
continue;
}
if(reader.LocalName.Equals("description")) {
description = ReadElementString(reader);
continue;
}
if(reader.LocalName.Equals("link")) {
link = ReadElementString(reader);
continue;
}
if(reader.LocalName.Equals("language")) {
language = ReadElementString(reader);
continue;
}
if(reader.LocalName.Equals("lastBuildDate")) {
DateTime.TryParse(ReadElementString(reader), out channelBuildDate);
continue;
}
if(reader.LocalName.Equals("pubDate") && channelBuildDate.Equals(DateTime.MinValue)) {
DateTime.TryParse(ReadElementString(reader), out channelBuildDate);
continue;
}
if(reader.LocalName.Equals("item")) {
IFeedItem rssItem = PopulateFeedItem(reader, feedType, url);
if(rssItem != null) {
items.Add(rssItem);
}
continue;
}
} else if(feedType.Equals(FeedType.Atom)) {
if(reader.LocalName.Equals("subtitle")) {
if(!reader.IsEmptyElement) {
description = ReadElementString(reader);
}
continue;
}
if(reader.LocalName.Equals("id")) {
if(!reader.IsEmptyElement) {
id = ReadElementString(reader);
}
continue;
}
if(reader.LocalName.Equals("link")) {
string rel = reader.GetAttribute("rel");
string href = reader.GetAttribute("href");
if(string.IsNullOrEmpty(link)) {
if(rel != null && href != null) {
if(rel.Equals("alternate")) {
link = href;
}
if(rel.Equals("self")) {
selfLink = href;
}
}
}
continue;
}
if(reader.LocalName.Equals("author")) {
author = PopulateAuthor(reader, feedType);
continue;
}
if(reader.LocalName.Equals("updated") || reader.LocalName.Equals("modified")) {
if(!reader.IsEmptyElement) {
DateTime.TryParse(ReadElementString(reader), out channelBuildDate);
}
continue;
}
if(reader.LocalName.Equals("entry") && !reader.IsEmptyElement) {
IFeedItem rssItem = PopulateFeedItem(reader, feedType, url);
if(rssItem != null) {
items.Add(rssItem);
}
continue;
}
}
}
XmlQualifiedName qname = new XmlQualifiedName(reader.LocalName, reader.NamespaceURI);
string optionalNode = reader.ReadOuterXml();
nodeRead = true;
if(!customElements.ContainsKey(qname)) {
customElements.Add(qname, optionalNode);
}
}
Uri feedUrl = GetUrl(link, url);
Uri selfFeedUrl = GetUrl(selfLink, url);
return new Feed(title, id, feedUrl, selfFeedUrl, description, channelBuildDate, language, null, items.ToArray(), author, customElements);
}
private static IFeedItem PopulateFeedItem(XmlReader reader, FeedType feedType, Uri url) {
string description = null;
string id = null;
string link = null;
string title = null;
int depth = reader.Depth;
DateTime date = DateTime.MinValue;
IAuthor author = null;
string itemNamespaceUri = reader.NamespaceURI;
Dictionary<XmlQualifiedName, string> customElements = new Dictionary<XmlQualifiedName, string>();
bool nodeRead = false;
while(nodeRead || reader.Read()) {
nodeRead = false;
if(reader.NodeType.Equals(XmlNodeType.EndElement) && reader.Depth.Equals(depth)) {
break;
}
if(!reader.NodeType.Equals(XmlNodeType.Element)) {
continue;
}
if(link != null && link.Trim().Length == 0)
link = null; // reset on empty elements
bool nodeNamespaceUriEqual2Item = reader.NamespaceURI.Equals(itemNamespaceUri);
if(feedType.Equals(FeedType.Rdf) || feedType.Equals(FeedType.Rss)) {
if(reader.IsEmptyElement) {
continue;
}
if(title == null && nodeNamespaceUriEqual2Item && reader.LocalName.Equals("title")) {
title = ReadElementString(reader);
continue;
}
if((link == null) || reader.LocalName.Equals("guid")) {
//favor rss:guid over rss:link
if(nodeNamespaceUriEqual2Item && reader.LocalName.Equals("guid")) {
if((reader["isPermaLink"] == null) || string.Equals(reader["isPermaLink"], "true", StringComparison.OrdinalIgnoreCase)) {
link = ReadElementString(reader);
} else if(string.Equals(reader["isPermaLink"], "false", StringComparison.OrdinalIgnoreCase)) {
id = ReadElementString(reader);
}
continue;
}
if(nodeNamespaceUriEqual2Item && reader.LocalName.Equals("link")) {
link = ReadElementString(reader);
continue;
}
}
if(date.Equals(DateTime.MinValue)) {
if(reader.LocalName.Equals("date") || (nodeNamespaceUriEqual2Item && reader.LocalName.Equals("pubDate"))) {
DateTime.TryParse(ReadElementString(reader), out date);
continue;
}
}
if(description == null || reader.LocalName.Equals("body") || reader.LocalName.Equals("encoded")) {
//prefer to replace rss:description/dc:description with content:encoded
if(reader.NamespaceURI.Equals("http://www.w3.org/1999/xhtml") && reader.LocalName.Equals("body")) {
XmlElement elem = (XmlElement)ElementCreator.ReadNode(reader);
description = elem != null ? elem.InnerXml : null;
continue;
}
if(reader.NamespaceURI.Equals("http://purl.org/rss/1.0/modules/content/") && reader.LocalName.Equals("encoded")) {
description = ReadElementString(reader);
continue;
}
if(nodeNamespaceUriEqual2Item && reader.LocalName.Equals("description")) {
description = ReadElementString(reader);
continue;
}
}
if(author == null || reader.LocalName.Equals("creator")) {
//prefer dc:creator to <author>
if(reader.LocalName.Equals("creator") || reader.LocalName.Equals("author")) {
author = PopulateAuthor(reader, feedType);
continue;
}
}
} else if(feedType.Equals(FeedType.Atom)) {
if(title == null) {
if(nodeNamespaceUriEqual2Item && reader.LocalName.Equals("title")) {
if(!reader.IsEmptyElement) {
title = GetContentFromAtomElement(reader);
}
continue;
}
}
if(id == null) {
if(nodeNamespaceUriEqual2Item && reader.LocalName.Equals("id")) {
if(!reader.IsEmptyElement) {
id = ReadElementString(reader);
}
continue;
}
}
if(link == null) {
if(nodeNamespaceUriEqual2Item && reader.LocalName.Equals("link") &&
(reader["rel"] == null || reader["rel"].Equals("alternate"))) {
if(reader["href"] != null) {
link = reader.GetAttribute("href");
}
if(!reader.IsEmptyElement) {
reader.Skip();
}
continue;
}
}
if(date.Equals(DateTime.MinValue) || reader.LocalName.Equals("modified") || reader.LocalName.Equals("updated")) {
//prefer modified date to publish date
if(nodeNamespaceUriEqual2Item && (reader.LocalName.Equals("modified") || reader.LocalName.Equals("updated"))) {
if(!reader.IsEmptyElement) {
DateTime.TryParse(ReadElementString(reader), out date);
}
continue;
}
if(nodeNamespaceUriEqual2Item && (reader.LocalName.Equals("issued") || reader.LocalName.Equals("published") || reader.LocalName.Equals("created"))) {
if(!reader.IsEmptyElement) {
DateTime.TryParse(ReadElementString(reader), out date);
}
continue;
}
}
if(description == null || (reader.LocalName.Equals("content") && reader["src"] == null)) {
//prefer to replace atom:summary with atom:content
if(!reader.IsEmptyElement) {
if(nodeNamespaceUriEqual2Item && reader.LocalName.Equals("content")) {
description = GetContentFromAtomElement(reader);
continue;
}
if(nodeNamespaceUriEqual2Item && reader.LocalName.Equals("summary")) {
description = GetContentFromAtomElement(reader);
continue;
}
}
}
if(author == null && !reader.IsEmptyElement && nodeNamespaceUriEqual2Item && reader.LocalName.Equals("author")) {
author = PopulateAuthor(reader, feedType);
continue;
}
}
XmlQualifiedName qname = new XmlQualifiedName(reader.LocalName, reader.NamespaceURI);
string optionalNode = reader.ReadOuterXml();
nodeRead = true;
if(!customElements.ContainsKey(qname)) {
customElements.Add(qname, optionalNode);
}
}
Uri feedUrl = GetUrl(link, url);
if(title == null)
return null;
return new FeedItem(title, id, description, feedUrl, date, author, customElements);
}
public AtomWriter(Stream stream, FeedType feedType) : base(stream, feedType) { }
public RssWriter(Stream stream, FeedType type) : base(stream, type) { }
public RssWriter(Stream stream, FeedType type) : base(stream, type)
{
}
public AtomWriter(Stream stream, FeedType feedType) : base(stream, feedType)
{
}
