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LibWeb/CSS: Add flags for element-backed & tree-abiding pseudo-elements

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Generate a couple of functions for checking if a pseudo-element fits
these categories.
This commit is contained in:
Sam Atkins
2026-03-31 16:48:28 +01:00
parent b23aa38546
commit 492cfc58d9
Notes: github-actions[bot] 2026-04-08 09:38:21 +00:00 
Author: https://github.com/AtkinsSJ
Commit: https://github.com/LadybirdBrowser/ladybird/commit/492cfc58d9e
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/8728
3 changed files with 80 additions and 7 deletions
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61
Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSPseudoElement.cpp
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@@ -87,6 +87,8 @@ Optional<PseudoElement> aliased_pseudo_element_from_string(StringView);
WEB_API StringView pseudo_element_name(PseudoElement);
bool is_has_allowed_pseudo_element(PseudoElement);
bool is_tree_abiding_pseudo_element(PseudoElement);
bool is_element_backed_pseudo_element(PseudoElement);
bool is_pseudo_element_root(PseudoElement);
bool pseudo_element_supports_property(PseudoElement, PropertyID);
@@ -222,6 +224,65 @@ bool is_has_allowed_pseudo_element(PseudoElement pseudo_element)
}
}
bool is_tree_abiding_pseudo_element(PseudoElement pseudo_element)
{
// Element-backed pseudo-elements are always tree-abiding.
// https://drafts.csswg.org/css-pseudo-4/#element-backed
if (is_element_backed_pseudo_element(pseudo_element))
return true;
switch (pseudo_element) {
)~~~");
pseudo_elements_data.for_each_member([&](auto& name, JsonValue const& value) {
auto& pseudo_element = value.as_object();
if (pseudo_element.has("alias-for"sv))
return;
if (!pseudo_element.get_bool("is-tree-abiding"sv).value_or(false))
return;
auto member_generator = generator.fork();
member_generator.set("name:titlecase", title_casify(name));
member_generator.append(R"~~~(
case PseudoElement::@name:titlecase@:
return true;
)~~~");
});
generator.append(R"~~~(
default:
return false;
}
}
bool is_element_backed_pseudo_element(PseudoElement pseudo_element)
{
switch (pseudo_element) {
)~~~");
pseudo_elements_data.for_each_member([&](auto& name, JsonValue const& value) {
auto& pseudo_element = value.as_object();
if (pseudo_element.has("alias-for"sv))
return;
if (!pseudo_element.get_bool("is-element-backed"sv).value_or(false))
return;
auto member_generator = generator.fork();
member_generator.set("name:titlecase", title_casify(name));
member_generator.append(R"~~~(
case PseudoElement::@name:titlecase@:
return true;
)~~~");
});
generator.append(R"~~~(
default:
return false;
}
}
bool is_pseudo_element_root(PseudoElement pseudo_element)
{
switch (pseudo_element) {