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Implement class selector fast path and add related tests for performance optimization

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wuggy 2026-09-07 14:12:03 -07:00
commit 80cfaf0891
8 changed files with 233 additions and 2 deletions
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59
dom/base/test/file_class_selector_checks.js Normal file
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@ -0,0 +1,59 @@
function checkClassSelectors(parse, equal) {
function check(root, selector, expected) {
var all = root.querySelectorAll(selector);
equal(all.length, expected.length, selector + " count");
for (var i = 0; i < expected.length; i++) {
equal(all[i].id, expected[i], selector + " order " + i);
}
equal(root.querySelector(selector), all.length ? all[0] : null,
selector + " first match");
}
var doc = parse('<!doctype html><html><body>' +
'<section id="root" class="toggle"><div id="a" class="toggle completed">' +
'<span id="b" class="other toggle"></span></div>' +
'<div id="c" class="TOGGLE"></div><button id="d" class="toggle\t extra"></button>' +
'<svg xmlns="http://www.w3.org/2000/svg"><g id="svg" class="toggle"/></svg>' +
'</section></body></html>', 'text/html');
var root = doc.getElementById('root');
for (var repeat = 0; repeat < 10; repeat++) {
check(root, '.toggle', ['a', 'b', 'd', 'svg']);
check(root, '*|*.toggle', ['a', 'b', 'd', 'svg']);
check(root, '.t\\6f ggle', ['a', 'b', 'd', 'svg']);
check(root, '.TOGGLE', ['c']);
check(root, '.missing', []);
check(root, '.toggle.completed', ['a']);
check(root, 'button.toggle', ['d']);
check(root, '.toggle:not(.completed)', ['b', 'd', 'svg']);
check(root, '.toggle, .other', ['a', 'b', 'd', 'svg']);
}
check(doc, '.toggle', ['root', 'a', 'b', 'd', 'svg']);
var snapshot = root.querySelectorAll('.toggle');
doc.getElementById('a').className = '';
root.removeChild(doc.getElementById('d'));
doc.getElementById('c').className = 'toggle';
check(root, '.toggle', ['b', 'c', 'svg']);
equal(snapshot.length, 4, 'querySelectorAll remains a static snapshot');
equal(snapshot[0].id, 'a', 'snapshot retains a changed element');
equal(snapshot[2].id, 'd', 'snapshot retains a removed element');
var fragment = doc.createDocumentFragment();
fragment.appendChild(root);
check(fragment, '.toggle', ['root', 'b', 'c', 'svg']);
check(root, '.toggle', ['b', 'c', 'svg']);
var quirks = parse('<html><body><div id="lower" class="toggle"></div>' +
'<div id="upper" class="TOGGLE"></div></body></html>', 'text/html');
equal(quirks.compatMode, 'BackCompat', 'quirks document');
check(quirks, '.toggle', ['lower', 'upper']);
check(quirks, '.TOGGLE', ['lower', 'upper']);
var xml = parse('<root><item id="plain" class="toggle"/>' +
'<item id="upper" class="TOGGLE"/>' +
'<item xmlns="urn:test" id="namespaced" class="toggle"/></root>',
'application/xml');
check(xml, '.toggle', ['plain', 'namespaced']);
check(xml, '|*.toggle', ['plain']);
check(xml, '*|*.toggle', ['plain', 'namespaced']);
}

2
dom/base/test/mochitest.ini
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@ -1,5 +1,6 @@
[DEFAULT]
support-files =
file_class_selector_checks.js
audio.ogg
audioEndedDuringPlaying.webm
iframe_bug962251.html
@ -615,6 +616,7 @@ skip-if = os == "mac" # Different tab focus behavior on mac
[test_caretPositionFromPoint.html]
[test_change_policy.html]
[test_classList.html]
[test_class_selector_fast_path.html]
[test_clearTimeoutIntervalNoArg.html]
[test_constructor-assignment.html]
[test_constructor.html]

10
dom/base/test/test_class_selector_fast_path.html Normal file
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@ -0,0 +1,10 @@
<!doctype html>
<meta charset="utf-8">
<title>Class selector query fast path</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script src="file_class_selector_checks.js"></script>
<script>
checkClassSelectors(function(source, type) {
return new DOMParser().parseFromString(source, type);
}, is);
</script>