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An RSS, Atom and JSON Feed parser written in Swift

License: MIT License

Ruby 0.10% C 0.27% Swift 99.63%

feedkit's Introduction

Features

Requirements

Installation >> instructions <<

Usage

Build a URL pointing to an RSS, Atom or JSON Feed.

let feedURL = URL(string: "http://images.apple.com/main/rss/hotnews/hotnews.rss")!

Get an instance of FeedParser

let parser = FeedParser(URL: feedURL) // or FeedParser(data: data) or FeedParser(xmlStream: stream)

Then call parse or parseAsync to start parsing the feed...

A common scenario in UI environments would be parsing a feed asynchronously from a user initiated action, such as the touch of a button. e.g.

// Parse asynchronously, not to block the UI.
parser.parseAsync(queue: DispatchQueue.global(qos: .userInitiated)) { (result) in
    // Do your thing, then back to the Main thread
    DispatchQueue.main.async {
        // ..and update the UI
    }
}

Remember, you are responsible to manually bring the result closure to whichever queue is apropriate. Usually to the Main thread, for UI apps, by calling DispatchQueue.main.async .

Alternatively, you can also parse synchronously.

let result = parser.parse()

Parse Result

FeedKit adopts Swift 5 Result type, as Result<Feed, ParserError>, and as such, if parsing succeeds you should now have a Strongly Typed Model of an RSS, Atom or JSON Feed, within the Feed enum:

switch result {
case .success(let feed):
    
    // Grab the parsed feed directly as an optional rss, atom or json feed object
    feed.rssFeed
    
    // Or alternatively...
    switch feed {
    case let .atom(feed):       // Atom Syndication Format Feed Model
    case let .rss(feed):        // Really Simple Syndication Feed Model
    case let .json(feed):       // JSON Feed Model
    }
    
case .failure(let error):
    print(error)
}

Model Preview

The RSS and Atom feed Models are rather extensive throughout the supported namespaces. These are just a preview of what's available.

RSS

feed.title
feed.link
feed.description
feed.language
feed.copyright
feed.managingEditor
feed.webMaster
feed.pubDate
feed.lastBuildDate
feed.categories
feed.generator
feed.docs
feed.cloud
feed.rating
feed.ttl
feed.image
feed.textInput
feed.skipHours
feed.skipDays
//...
feed.dublinCore
feed.syndication
feed.iTunes
// ...

let item = feed.items?.first

item?.title
item?.link
item?.description
item?.author
item?.categories
item?.comments
item?.enclosure
item?.guid
item?.pubDate
item?.source
//...
item?.dublinCore
item?.content
item?.iTunes
item?.media
// ...

Atom

feed.title
feed.subtitle
feed.links
feed.updated
feed.authors
feed.contributors
feed.id
feed.generator
feed.icon
feed.logo
feed.rights
// ...

let entry = feed.entries?.first

entry?.title
entry?.summary
entry?.authors
entry?.contributors
entry?.links
entry?.updated
entry?.categories
entry?.id
entry?.content
entry?.published
entry?.source
entry?.rights
// ...

JSON

feed.version
feed.title
feed.homePageURL
feed.feedUrl
feed.description
feed.userComment
feed.nextUrl
feed.icon
feed.favicon
feed.author
feed.expired
feed.hubs
feed.extensions
// ...

let item = feed.items?.first

item?.id
item?.url
item?.externalUrl
item?.title
item?.contentText
item?.contentHtml
item?.summary
item?.image
item?.bannerImage
item?.datePublished
item?.dateModified
item?.author
item?.url
item?.tags
item?.attachments
item?.extensions
// ...