dom_query 0.27.0

HTML querying and manipulation with CSS selectors
Documentation 
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use dom_query::Document;

#[cfg(target_arch = "wasm32")]
use wasm_bindgen_test::*;

mod alloc;

const SIMPLE_LIST_CONTENT: &str = r#"<!DOCTYPE html>
    <html>
        <head><title>Test</title></head>
        <body>
           <ul class="list">
               <li>1</li>
               <li>2</li>
               <li>3</li>
           </ul>
           <ul>
               <li>4</li>
            </ul>
        </body>
    </html>"#;

const LINKS_CONTENT: &str = r#"<!DOCTYPE html>
    <html lang="en">
        <head><title>Test</title></head>
        <body>
        <div>
            <a class="link first-link" href="/1">One</a>
            <a class="link second-link" href="/2">Two</a>
            <a class="link" href="/3"><span>Three</span></a>
        </div>
        </body>
    </html>"#;

const EMPTY_HEADINGS_CONTENT: &str = r#"<!DOCTYPE html>
    <html>
        <head><title>Test</title></head>
        <body>
           <h1>
           </h1>
           <h2>
           </h2>
           <h3>
           </h3>
           <h1>1</h1>
           <h2>2</h2>
           <h3>3</h3>
        </body>
    </html>
    "#;

#[cfg_attr(not(target_arch = "wasm32"), test)]
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
fn pseudo_class_has() {
    let document = Document::from(LINKS_CONTENT);

    let sel = r#"div:has(a[href]) a span"#;
    let span = document.select(sel);

    let text: &str = &span.text();
    assert_eq!(text, "Three");
}

#[cfg_attr(not(target_arch = "wasm32"), test)]
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
fn pseudo_class_has_any_link() {
    let document = Document::from(LINKS_CONTENT);
    let sel = r#"div:has(*:any-link) a span"#;
    let span = document.select(sel).first();

    let text: &str = &span.text();
    assert_eq!(text, "Three");
}

#[cfg_attr(not(target_arch = "wasm32"), test)]
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
fn pseudo_class_link() {
    let document = Document::from(LINKS_CONTENT);
    let sel = r#"div *:link"#;
    let span = document.select(sel).first();

    let text: &str = &span.text();
    assert_eq!(text, "One");
}

#[cfg_attr(not(target_arch = "wasm32"), test)]
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
#[should_panic]
fn pseudo_class_has_bad() {
    let document = Document::from(LINKS_CONTENT);
    let sel = r#"div:hasa(*:any-link) a span"#;
    let span = document.select(sel);

    let text: &str = &span.text();
    assert_eq!(text, "Three");
}

#[cfg_attr(not(target_arch = "wasm32"), test)]
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
fn pseudo_class_contains_text() {
    let document = Document::from(LINKS_CONTENT);
    let sel = r#"div a:has-text("Three")"#;
    let span = document.select(sel);

    let text: &str = &span.text();
    assert_eq!(text, "Three");
}

#[cfg_attr(not(target_arch = "wasm32"), test)]
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
#[should_panic]
fn pseudo_class_has_text_fail() {
    let html = r#"
    <div>
        <a href="/1">One</a>
        <a href="/2">Two</a>
        <a href="/3">It is not <span>how</span> it works</a>
    </div>"#;
    let document = Document::from(html);
    let sel = r#"div a:has-text("how it works")"#;
    // it is not going to find anything,
    // because it is searching in the each node's text and not in the final text.
    // The last element `a` contains three nodes:
    // `text node ("It is not "), element node ("how") and text node (" it works")`
    let span = document.select(sel).first();

    let text: &str = &span.text();

    assert_eq!(text, "It is not how it works");
}

#[cfg_attr(not(target_arch = "wasm32"), test)]
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
fn pseudo_class_contains() {
    let html = r#"
    <div>
        <a href="/1">One</a>
        <a href="/2">Two</a>
        <a href="/3">It is not <span>how</span> it works</a>
    </div>"#;
    let document = Document::from(html);
    let sel = r#"div a:contains("how it works")"#;
    let span = document.select(sel);
    // And `:contains` will match the last `a` element,
    // because it searches in the merged text of the element and its descendants.
    let text: &str = &span.text();

    assert_eq!(text, "It is not how it works");
}

#[cfg_attr(not(target_arch = "wasm32"), test)]
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
fn pseudo_class_only_text() {
    //! :only-text pseudo-class allows selecting a node with no child elements except a single **text** child node.

    let html = r#"<!DOCTYPE html>
    <html>
        <head>
            <title>Test</title>
        </head>
        <body>
            <div>
                <a href="/1">One</a>
                <a href="/2">Two</a>
                <a href="/3">Three</a>
            </div>
            <div>
            </div>
            <div>Only text</div>
        </body>
    </html>
    "#;
    let document = Document::from(html);
    let sel = document.select("body div:only-text");
    // this selector must ignore empty elements and elements that contains only whitespace
    // in this example the previous node of div with `Only text` is not empty,
    // it contains whitespace characters, so it will be ignored
    assert!(sel.length() == 1);
    assert_eq!(&sel.inner_html(), "Only text");
}

#[cfg_attr(not(target_arch = "wasm32"), test)]
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
fn pseudo_class_not() {
    let document = Document::from(LINKS_CONTENT);
    let sel = r#"div a[class]:not(.first-link,.second-link)"#;
    let span = document.select(sel).first();
    let text: &str = &span.text();

    assert_eq!(text, "Three");
}

#[cfg_attr(not(target_arch = "wasm32"), test)]
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
fn test_is() {
    //! select h1, h2, h3 elements if they are empty
    let doc: Document = EMPTY_HEADINGS_CONTENT.into();
    let is_sel = doc.select(":is(h1,h2,h3):empty");
    assert_eq!(is_sel.length(), 3);
}

#[cfg_attr(not(target_arch = "wasm32"), test)]
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
fn test_where() {
    //! select h1, h2, h3 elements if they are empty
    let doc: Document = EMPTY_HEADINGS_CONTENT.into();
    let where_sel = doc.select(":where(h1,h2,h3):empty");
    assert_eq!(where_sel.length(), 3);
}

#[cfg_attr(not(target_arch = "wasm32"), test)]
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
fn test_empty() {
    //! select all empty elements inside `body` element
    let doc: Document = EMPTY_HEADINGS_CONTENT.into();
    let where_sel = doc.select("body :empty");
    assert_eq!(where_sel.length(), 3);
}

#[cfg_attr(not(target_arch = "wasm32"), test)]
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
fn test_nth_last_child() {
    let doc: Document = SIMPLE_LIST_CONTENT.into();

    let sel = doc.select("ul.list li:nth-last-child(1)");
    assert_eq!(&sel.text(), "3");
}

#[cfg_attr(not(target_arch = "wasm32"), test)]
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
fn test_nth_child() {
    let doc: Document = SIMPLE_LIST_CONTENT.into();

    let sel = doc.select("ul.list li:nth-child(1)");
    assert_eq!(&sel.text(), "1");
}

#[cfg_attr(not(target_arch = "wasm32"), test)]
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
fn test_first_child() {
    let doc: Document = SIMPLE_LIST_CONTENT.into();

    let sel = doc.select("ul.list li:first-child");
    assert_eq!(&sel.text(), "1");
}

#[cfg_attr(not(target_arch = "wasm32"), test)]
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
fn test_last_child() {
    let doc: Document = SIMPLE_LIST_CONTENT.into();

    let sel = doc.select("ul.list li:last-child");
    assert_eq!(&sel.text(), "3");
}

#[cfg_attr(not(target_arch = "wasm32"), test)]
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
fn test_last_of_type() {
    let doc: Document = SIMPLE_LIST_CONTENT.into();

    let sel = doc.select("ul.list li:last-of-type");
    assert_eq!(&sel.text(), "3");
}

#[cfg_attr(not(target_arch = "wasm32"), test)]
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
fn test_only() {
    let doc: Document = SIMPLE_LIST_CONTENT.into();

    let sel = doc.select("ul li:only-child");
    assert_eq!(&sel.text(), "4");
}

#[cfg_attr(not(target_arch = "wasm32"), test)]
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
fn test_only_of_type() {
    let doc: Document = SIMPLE_LIST_CONTENT.into();

    let sel = doc.select("ul li:only-of-type");
    assert_eq!(&sel.text(), "4");
}

#[cfg_attr(not(target_arch = "wasm32"), test)]
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
#[should_panic]
fn test_unsupported_pseudo_class() {
    let doc: Document = SIMPLE_LIST_CONTENT.into();

    doc.select("*:required");
}

#[cfg_attr(not(target_arch = "wasm32"), test)]
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
fn test_try_unsupported_pseudo_class() {
    let doc: Document = SIMPLE_LIST_CONTENT.into();

    let sel = doc.try_select("*:required");

    assert!(sel.is_none());
}

#[cfg_attr(not(target_arch = "wasm32"), test)]
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)]
#[should_panic]
fn test_unsupported_functional_pseudo_class() {
    let doc: Document = SIMPLE_LIST_CONTENT.into();

    doc.select(":lang(en-US)");
}