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ReadFeed

ReadFeed is a library to process feeds. It provides pull parsers for common feed formats such as RSS and Atom.

Examples

RSS

use readfeed::rss::{self, ChannelElem, Elem, ItemElem, RssElem};

let input = "
<rss>
    <channel>
        <title>Channel Title</title>
        <item>
            <title>Item Title 1</title>
            <link>https://example.com/1</link>
            <description>Item Description 1</description>
        </item>
    </channel>
</rss>
";

let mut iter = rss::Iter::new(input);

let Some(Elem::Rss(mut rss_iter)) = iter.next() else {
    panic!();
};

let Some(RssElem::Channel(mut channel_iter)) = rss_iter.next() else {
    panic!();
};

if let Some(ChannelElem::Title(title)) = channel_iter.next() {
    assert_eq!("Channel Title", title.content());
} else {
    panic!();
}

let Some(ChannelElem::Item(mut item_iter)) = channel_iter.next() else {
    panic!();
};

if let Some(ItemElem::Title(title)) = item_iter.next() {
    assert_eq!("Item Title 1", title.content());
} else {
    panic!();
}
if let Some(ItemElem::Link(link)) = item_iter.next() {
    assert_eq!("https://example.com/1", link.content());
} else {
    panic!();
}
if let Some(ItemElem::Description(desc)) = item_iter.next() {
    assert_eq!("Item Description 1", desc.content());
} else {
    panic!();
}
assert_eq!(None, item_iter.next());

assert_eq!(None, channel_iter.next());
assert_eq!(None, rss_iter.next());
assert_eq!(None, iter.next());

Atom

use readfeed::atom::{self, Elem, EntryElem, FeedElem};

let input = r#"
<feed xmlns="http://www.w3.org/2005/Atom">
    <title>Lorem ipsum dolor sit amet.</title>
    <link href="https://example.com/"/>
    <updated>2021-02-24T09:08:10Z</updated>
    <id>urn:uuid:ba9192e8-9e34-4c23-8445-94b67ba316ee</id>
    <entry>
        <title>Lorem ipsum dolor sit.</title>
        <link href="http://example.com/2021/02/24/hello"/>
        <id>urn:uuid:425ba23c-d283-4580-8a3c-3b67aaa6b373</id>
        <updated>2021-02-24T09:08:10Z</updated>
        <summary>Lorem ipsum dolor sit amet, consectetur adipiscing.</summary>
    </entry>
</feed>
"#;

let mut iter = atom::Iter::new(input);

let Some(Elem::Feed(mut feed_iter)) = iter.next() else {
    panic!();
};

if let Some(FeedElem::Title(title)) = feed_iter.next() {
    assert_eq!("Lorem ipsum dolor sit amet.", title.content());
} else {
    panic!();
}

if let Some(FeedElem::Link(link)) = feed_iter.next() {
    assert_eq!(Some("https://example.com/"), link.href().map(|v| v.as_str()));
} else {
    panic!();
}

if let Some(FeedElem::Updated(updated)) = feed_iter.next() {
    assert_eq!("2021-02-24T09:08:10Z", updated.content());
} else {
    panic!();
}

if let Some(FeedElem::Id(id)) = feed_iter.next() {
    assert_eq!("urn:uuid:ba9192e8-9e34-4c23-8445-94b67ba316ee", id.content());
} else {
    panic!();
}

if let Some(FeedElem::Entry(mut entry_iter)) = feed_iter.next() {
    if let Some(EntryElem::Title(title)) = entry_iter.next() {
        assert_eq!("Lorem ipsum dolor sit.", title.content());
    } else {
        panic!();
    }
    if let Some(EntryElem::Link(link)) = entry_iter.next() {
        assert_eq!(Some("http://example.com/2021/02/24/hello"), link.href().map(|v| v.as_str()));
    } else {
        panic!();
    }
    if let Some(EntryElem::Id(id)) = entry_iter.next() {
        assert_eq!("urn:uuid:425ba23c-d283-4580-8a3c-3b67aaa6b373", id.content());
    } else {
        panic!();
    }
    if let Some(EntryElem::Updated(updated)) = entry_iter.next() {
        assert_eq!("2021-02-24T09:08:10Z", updated.content());
    } else {
        panic!();
    }
    if let Some(EntryElem::Summary(summary)) = entry_iter.next() {
        assert_eq!("Lorem ipsum dolor sit amet, consectetur adipiscing.", summary.content());
    } else {
        panic!();
    }
    assert_eq!(None, entry_iter.next());
} else {
    panic!();
}

assert_eq!(None, feed_iter.next());
assert_eq!(None, iter.next());

Installation

cargo add readfeed

By default, the std feature is enabled.

Alloc only

If the host environment has an allocator but does not have access to the Rust std library:

cargo add --no-default-features --features alloc readfeed

No allocator / core only

If the host environment does not have an allocator:

cargo add --no-default-features readfeed

License

Licensed under either of Apache License, Version 2.0 or MIT License at your option.

Contributions

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.