web-api-cat 0.7.19

Bindings between boa-cat (JS engine) and the DOM (html-cat tree) plus fetch (net-cat). v0.7.19 finishes the form-state pseudo-class trio started in v0.7.18: `:disabled` matches form-control elements with a `disabled` attribute, `:enabled` matches form-control elements without one. Tag-gated to the HTML form-control set (`input`, `button`, `select`, `textarea`, `option`, `optgroup`, `fieldset`) so `<div disabled>` correctly matches neither. Combines freely with attribute selectors and `:not()`. Seventh sub-crate of a Servo-replacement webview runtime targeting Tauri.
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//! v0.7.18 form-control accessors: `<input>.value` /
//! `<input>.checked` property reflection and the `:checked`
//! pseudo-class.

use boa_cat::env::Env;
use boa_cat::evaluate_program_with;
use boa_cat::fuel::Fuel;
use boa_cat::heap::Heap;
use boa_cat::value::Value;
use ecma_lex_cat::lex;
use ecma_parse_cat::parse_script;
use web_api_cat::Error;

fn run(html: &str, script: &str) -> Result<Value, Error> {
    let html_doc = html_cat::parse(html)?;
    let (env, heap) = web_api_cat::install(Env::empty(), Heap::new(), &html_doc);
    let tokens = lex(script).map_err(boa_cat::Error::from)?;
    let program = parse_script(&tokens).map_err(boa_cat::Error::from)?;
    let (value, _heap) =
        evaluate_program_with(&program, env, heap, Fuel::new(200_000)).map_err(Error::from)?;
    Ok(value)
}

fn fail(_msg: &'static str) -> Error {
    Error::Engine(boa_cat::Error::Unsupported { feature: "test" })
}

#[test]
fn input_value_getter_reflects_attribute() -> Result<(), Error> {
    let value = run(
        "<html><body><input id='host' value='initial'/></body></html>",
        "document.getElementById('host').value",
    )?;
    matches!(value, Value::String(ref s) if s == "initial")
        .then_some(())
        .ok_or_else(|| fail("expected input.value to reflect the value attribute"))
}

#[test]
fn input_value_getter_empty_when_attribute_missing() -> Result<(), Error> {
    let value = run(
        "<html><body><input id='host'/></body></html>",
        "document.getElementById('host').value",
    )?;
    matches!(value, Value::String(ref s) if s.is_empty())
        .then_some(())
        .ok_or_else(|| fail("expected input.value to default to ''"))
}

#[test]
fn input_value_setter_round_trips() -> Result<(), Error> {
    let value = run(
        "<html><body><input id='host' value='before'/></body></html>",
        "const el = document.getElementById('host');
        el.value = 'after';
        el.value",
    )?;
    matches!(value, Value::String(ref s) if s == "after")
        .then_some(())
        .ok_or_else(|| fail("expected input.value setter to round-trip"))
}

#[test]
fn input_value_setter_updates_get_attribute() -> Result<(), Error> {
    // Setting .value should also be visible via getAttribute('value').
    let value = run(
        "<html><body><input id='host' value='before'/></body></html>",
        "const el = document.getElementById('host');
        el.value = 'after';
        el.getAttribute('value')",
    )?;
    matches!(value, Value::String(ref s) if s == "after")
        .then_some(())
        .ok_or_else(|| fail("expected input.value setter to reflect via getAttribute"))
}

#[test]
fn input_checked_getter_reflects_attribute_presence() -> Result<(), Error> {
    let value = run(
        "<html><body>
            <input id='on' type='checkbox' checked/>
            <input id='off' type='checkbox'/>
        </body></html>",
        "const on = document.getElementById('on');
        const off = document.getElementById('off');
        const ok = on.checked === true && off.checked === false;
        ok ? 'ok' : 'wrong'",
    )?;
    matches!(value, Value::String(ref s) if s == "ok")
        .then_some(())
        .ok_or_else(|| fail("expected input.checked to reflect attribute presence"))
}

#[test]
fn input_checked_setter_adds_and_removes_attribute() -> Result<(), Error> {
    let value = run(
        "<html><body><input id='host' type='checkbox'/></body></html>",
        "const el = document.getElementById('host');
        el.checked = true;
        const after_on = el.hasAttribute('checked');
        el.checked = false;
        const after_off = el.hasAttribute('checked');
        (after_on === true && after_off === false) ? 'ok' : 'wrong'",
    )?;
    matches!(value, Value::String(ref s) if s == "ok")
        .then_some(())
        .ok_or_else(|| fail("expected input.checked setter to add then remove the attribute"))
}

#[test]
fn checked_pseudo_class_via_query_selector() -> Result<(), Error> {
    let value = run(
        "<html><body>
            <input type='checkbox'/>
            <input id='want' type='checkbox' checked/>
            <input type='checkbox'/>
        </body></html>",
        "document.querySelector(':checked').id",
    )?;
    matches!(value, Value::String(ref s) if s == "want")
        .then_some(())
        .ok_or_else(|| fail("expected ':checked' to pick the checked input"))
}

#[test]
fn checked_pseudo_class_via_query_selector_all() -> Result<(), Error> {
    let value = run(
        "<html><body>
            <input type='checkbox' checked/>
            <input type='checkbox'/>
            <input type='checkbox' checked/>
            <input type='radio' checked/>
        </body></html>",
        "document.querySelectorAll(':checked').length",
    )?;
    matches!(value, Value::Number(n) if (n - 3.0).abs() < 1e-9)
        .then_some(())
        .ok_or_else(|| fail("expected three :checked inputs"))
}

#[test]
fn checked_pseudo_class_combines_with_tag_and_attribute() -> Result<(), Error> {
    let value = run(
        "<html><body>
            <input type='checkbox' checked/>
            <input id='want' type='radio' checked name='group'/>
            <input type='radio' name='group'/>
        </body></html>",
        "document.querySelector('input[type=radio]:checked').id",
    )?;
    matches!(value, Value::String(ref s) if s == "want")
        .then_some(())
        .ok_or_else(|| fail("expected 'input[type=radio]:checked' to pick the checked radio"))
}

#[test]
fn checked_pseudo_class_updates_after_setter() -> Result<(), Error> {
    // Set checked via the JS property, then query-select :checked --
    // the new state should be visible.
    let value = run(
        "<html><body>
            <input id='a' type='checkbox'/>
            <input id='b' type='checkbox'/>
        </body></html>",
        "document.getElementById('b').checked = true;
        document.querySelector(':checked').id",
    )?;
    matches!(value, Value::String(ref s) if s == "b")
        .then_some(())
        .ok_or_else(|| fail("expected ':checked' to track the post-setter state"))
}

#[test]
fn checked_pseudo_class_combines_with_not() -> Result<(), Error> {
    let value = run(
        "<html><body>
            <input id='want' type='checkbox'/>
            <input type='checkbox' checked/>
        </body></html>",
        "document.querySelector('input:not(:checked)').id",
    )?;
    matches!(value, Value::String(ref s) if s == "want")
        .then_some(())
        .ok_or_else(|| fail("expected ':not(:checked)' to pick the unchecked input"))
}

#[test]
fn disabled_pseudo_class_matches_disabled_input() -> Result<(), Error> {
    let value = run(
        "<html><body>
            <input type='text'/>
            <input id='want' type='text' disabled/>
            <input type='text'/>
        </body></html>",
        "document.querySelector(':disabled').id",
    )?;
    matches!(value, Value::String(ref s) if s == "want")
        .then_some(())
        .ok_or_else(|| fail("expected ':disabled' to pick the disabled input"))
}

#[test]
fn enabled_pseudo_class_skips_non_form_elements() -> Result<(), Error> {
    // Despite the div having a 'disabled' attribute, it is NOT a
    // form control, so neither :disabled nor :enabled matches.
    // Only the input is enabled.
    let value = run(
        "<html><body>
            <div id='div' disabled>x</div>
            <input id='want' type='text'/>
        </body></html>",
        "document.querySelector(':enabled').id",
    )?;
    matches!(value, Value::String(ref s) if s == "want")
        .then_some(())
        .ok_or_else(|| fail("expected ':enabled' to skip <div disabled> and pick the input"))
}

#[test]
fn disabled_pseudo_class_skips_non_form_elements() -> Result<(), Error> {
    // <div disabled> should NOT match :disabled.  Only the form
    // control input does.
    let value = run(
        "<html><body>
            <div disabled>x</div>
            <input id='want' type='text' disabled/>
        </body></html>",
        "document.querySelector(':disabled').id",
    )?;
    matches!(value, Value::String(ref s) if s == "want")
        .then_some(())
        .ok_or_else(|| fail("expected ':disabled' to skip <div disabled> and pick the input"))
}

#[test]
fn enabled_disabled_partition_form_controls() -> Result<(), Error> {
    let value = run(
        "<html><body>
            <input type='text' disabled/>
            <input type='text'/>
            <button disabled>x</button>
            <button>y</button>
            <select disabled></select>
            <select></select>
        </body></html>",
        "const en = document.querySelectorAll(':enabled').length;
        const di = document.querySelectorAll(':disabled').length;
        (en === 3 && di === 3) ? 'ok' : (en + ',' + di)",
    )?;
    matches!(value, Value::String(ref s) if s == "ok")
        .then_some(())
        .ok_or_else(|| fail("expected :enabled and :disabled to partition the 6 form controls 3/3"))
}

#[test]
fn enabled_pseudo_class_covers_all_form_tags() -> Result<(), Error> {
    // input / button / select / textarea / option / optgroup / fieldset
    // are all form controls per HTML spec.  Each without 'disabled'
    // should match :enabled.
    let value = run(
        "<html><body>
            <input type='text'/>
            <button>b</button>
            <select><optgroup><option>x</option></optgroup></select>
            <textarea></textarea>
            <fieldset></fieldset>
        </body></html>",
        "document.querySelectorAll(':enabled').length",
    )?;
    // 7 form controls total: input, button, select, optgroup, option, textarea, fieldset.
    matches!(value, Value::Number(n) if (n - 7.0).abs() < 1e-9)
        .then_some(())
        .ok_or_else(|| fail("expected all 7 form-control tags to match :enabled"))
}

#[test]
fn disabled_updates_after_set_attribute() -> Result<(), Error> {
    let value = run(
        "<html><body>
            <input id='host' type='text'/>
        </body></html>",
        "const el = document.getElementById('host');
        const before = el.matches(':enabled');
        el.setAttribute('disabled', '');
        const after = el.matches(':disabled');
        (before === true && after === true) ? 'ok' : 'wrong'",
    )?;
    matches!(value, Value::String(ref s) if s == "ok")
        .then_some(())
        .ok_or_else(|| fail("expected setAttribute('disabled') to flip :enabled to :disabled"))
}

#[test]
fn disabled_combines_with_attribute_selector() -> Result<(), Error> {
    let value = run(
        "<html><body>
            <input type='text' disabled/>
            <input id='want' type='checkbox' disabled/>
        </body></html>",
        "document.querySelector('input[type=checkbox]:disabled').id",
    )?;
    matches!(value, Value::String(ref s) if s == "want")
        .then_some(())
        .ok_or_else(|| {
            fail("expected 'input[type=checkbox]:disabled' to pick the disabled checkbox")
        })
}

#[test]
fn matches_with_checked_pseudo_class() -> Result<(), Error> {
    let value = run(
        "<html><body>
            <input id='on' type='checkbox' checked/>
            <input id='off' type='checkbox'/>
        </body></html>",
        "const on = document.getElementById('on');
        const off = document.getElementById('off');
        const ok = on.matches(':checked') === true && off.matches(':checked') === false;
        ok ? 'ok' : 'wrong'",
    )?;
    matches!(value, Value::String(ref s) if s == "ok")
        .then_some(())
        .ok_or_else(|| fail("expected matches(':checked') to discriminate by attribute"))
}