scraper

HTML parsing and querying with CSS selectors.

scraper is on crates.io and GitHub.

Scraper provides an interface to Servo's html5ever and selectors crates, for browser-grade parsing and querying.

Examples

Parsing a document

use scraper::Html;

let html = r#"
    <!DOCTYPE html>
    <meta charset="utf-8">
    <title>Hello, world!</title>
    <h1 class="foo">Hello, <i>world!</i></h1>
"#;

let document = Html::parse_document(html);

Parsing a fragment

use scraper::Html;
let fragment = Html::parse_fragment("<h1>Hello, <i>world!</i></h1>");

Parsing a selector

use scraper::Selector;
let selector = Selector::parse("h1.foo").unwrap();

Selecting elements

use scraper::{Html, Selector};

let html = r#"
    <ul>
        <li>Foo</li>
        <li>Bar</li>
        <li>Baz</li>
    </ul>
"#;

let fragment = Html::parse_fragment(html);
let selector = Selector::parse("li").unwrap();

for element in fragment.select(&selector) {
    assert_eq!("li", element.value().name());
}

Selecting descendent elements

use scraper::{Html, Selector};

let html = r#"
    <ul>
        <li>Foo</li>
        <li>Bar</li>
        <li>Baz</li>
    </ul>
"#;

let fragment = Html::parse_fragment(html);
let ul_selector = Selector::parse("ul").unwrap();
let li_selector = Selector::parse("li").unwrap();

let ul = fragment.select(&ul_selector).next().unwrap();
for element in ul.select(&li_selector) {
    assert_eq!("li", element.value().name());
}

Accessing element attributes

use scraper::{Html, Selector};

let fragment = Html::parse_fragment(r#"<input name="foo" value="bar">"#);
let selector = Selector::parse(r#"input[name="foo"]"#).unwrap();

let input = fragment.select(&selector).next().unwrap();
assert_eq!(Some("bar"), input.value().attr("value"));

Serializing HTML and inner HTML

use scraper::{Html, Selector};

let fragment = Html::parse_fragment("<h1>Hello, <i>world!</i></h1>");
let selector = Selector::parse("h1").unwrap();

let h1 = fragment.select(&selector).next().unwrap();

assert_eq!("<h1>Hello, <i>world!</i></h1>", h1.html());
assert_eq!("Hello, <i>world!</i>", h1.inner_html());

Accessing descendent text

use scraper::{Html, Selector};

let fragment = Html::parse_fragment("<h1>Hello, <i>world!</i></h1>");
let selector = Selector::parse("h1").unwrap();

let h1 = fragment.select(&selector).next().unwrap();
let text = h1.text().collect::<Vec<_>>();

assert_eq!(vec!["Hello, ", "world!"], text);

Manipulating the DOM

use html5ever::tree_builder::TreeSink;
use scraper::{Html, Selector, HtmlTreeSink};

let html = "<html><body>hello<p class=\"hello\">REMOVE ME</p></body></html>";
let selector = Selector::parse(".hello").unwrap();
let mut document = Html::parse_document(html);
let node_ids: Vec<_> = document.select(&selector).map(|x| x.id()).collect();
let tree = HtmlTreeSink::new(document);
for id in node_ids {
    tree.remove_from_parent(&id);
}
let document = tree.finish();
assert_eq!(document.html(), "<html><head></head><body>hello</body></html>");

Using the library across threads

The html5ever crate uses the Tendril type as their reference counted string. By default, it's thread-local and thus !Send, enabling the atomic flag will use the atomic counting version of Tendril, implementing Send and allow their use across threads.

[dependencies]
scraper = { version = "0.27.0", features = ["atomic"] }

Contributing

Please feel free to open pull requests. If you're planning on implementing something big (i.e. not fixing a typo, a small bug fix, minor refactor, etc.) then please open an issue first.