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LibWeb: Remove first rule if no argument is given for remove_rule()

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While this isn't explicitly mentioned in the specification, there is a
WPT test that checks for this behavior.
This commit is contained in:
Tim Ledbetter 2024-02-24 07:46:59 +00:00 • committed by Andreas Kling
parent 3ea318ca8b
commit 1d825f17c0
5 changed files with 57 additions and 4 deletions
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12
Tests/LibWeb/Text/expected/css/CSSStyleSheet-removeRule.txt Normal file
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@ -0,0 +1,12 @@
Exception thrown when removeRule() called on empty sheet: IndexSizeError
Rule count after adding 3 rules: 3
Rule text: .test { padding: 10px; }
Rule text: .test { margin: 5px; }
Rule text: .test { font-size: 14px; }
Rule count after calling removeRule with no arguments: 2
Rule text: .test { margin: 5px; }
Rule text: .test { font-size: 14px; }
Rule count after calling removeRule with explicit index: 1
Rule text: .test { margin: 5px; }
Exception thrown when given a negative index: IndexSizeError
Exception thrown when index out of range: IndexSizeError

41
Tests/LibWeb/Text/input/css/CSSStyleSheet-removeRule.html Normal file
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@ -0,0 +1,41 @@
<!DOCTYPE html>
<script src="../include.js"></script>
<script>
test(() => {
const sheet = new CSSStyleSheet();
try {
sheet.removeRule();
println("FAIL");
} catch (e) {
println(`Exception thrown when removeRule() called on empty sheet: ${e.name}`);
}
sheet.addRule(".test", "padding: 10px");
sheet.addRule(".test", "margin: 5px");
sheet.addRule(".test", "font-size: 14px");
println(`Rule count after adding 3 rules: ${sheet.cssRules.length}`);
for (const rule of sheet.cssRules) {
println(`Rule text: ${rule.cssText}`);
}
sheet.removeRule();
println(`Rule count after calling removeRule with no arguments: ${sheet.cssRules.length}`);
for (const rule of sheet.cssRules) {
println(`Rule text: ${rule.cssText}`);
}
sheet.removeRule(1);
println(`Rule count after calling removeRule with explicit index: ${sheet.cssRules.length}`);
println(`Rule text: ${sheet.cssRules[0].cssText}`);
try {
sheet.removeRule(-1);
println("FAIL");
} catch (e) {
println(`Exception thrown when given a negative index: ${e.name}`);
}
try {
sheet.removeRule(1);
println("FAIL");
} catch (e) {
println(`Exception thrown when index out of range: ${e.name}`);
}
});
</script>

4
Userland/Libraries/LibWeb/CSS/CSSStyleSheet.cpp
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@ -286,10 +286,10 @@ WebIDL::ExceptionOr<WebIDL::Long> CSSStyleSheet::add_rule(Optional<String> selec
}
// https://www.w3.org/TR/cssom/#dom-cssstylesheet-removerule
WebIDL::ExceptionOr<void> CSSStyleSheet::remove_rule(unsigned index)
WebIDL::ExceptionOr<void> CSSStyleSheet::remove_rule(Optional<WebIDL::UnsignedLong> index)
{
// The removeRule(index) method must run the same steps as deleteRule().
return delete_rule(index);
return delete_rule(index.value_or(0));
}
void CSSStyleSheet::for_each_effective_style_rule(Function<void(CSSStyleRule const&)> const& callback) const

2
Userland/Libraries/LibWeb/CSS/CSSStyleSheet.h
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@ -51,7 +51,7 @@ public:
WebIDL::ExceptionOr<unsigned> insert_rule(StringView rule, unsigned index);
WebIDL::ExceptionOr<WebIDL::Long> add_rule(Optional<String> selector, Optional<String> style, Optional<WebIDL::UnsignedLong> index);
WebIDL::ExceptionOr<void> remove_rule(unsigned index);
WebIDL::ExceptionOr<void> remove_rule(Optional<WebIDL::UnsignedLong> index);
WebIDL::ExceptionOr<void> delete_rule(unsigned index);
JS::NonnullGCPtr<JS::Promise> replace(String text);

2
Userland/Libraries/LibWeb/CSS/CSSStyleSheet.idl
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@ -19,7 +19,7 @@ interface CSSStyleSheet : StyleSheet {
// https://drafts.csswg.org/cssom/#legacy-css-style-sheet-members
[SameObject, ImplementedAs=css_rules] readonly attribute CSSRuleList rules;
long addRule(optional DOMString selector = "undefined", optional DOMString style = "undefined", optional unsigned long index);
undefined removeRule(unsigned long index);
undefined removeRule(optional unsigned long index);
};
dictionary CSSStyleSheetInit {