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LibWeb/CSS: Implement aliases for pseudo-elements

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We previously supported a few -webkit vendor-prefixed pseudo-elements.
This patch adds those back, along with -moz equivalents, by aliasing
them to standard ones. They behave identically, except for serializing
with their original name, just like for unrecognized -webkit
pseudo-elements.

It's likely to be a while before the forms spec settles and authors
start using the new pseudo-elements, so until then, we can still make
use of styles they've written for the non-standard ones.
This commit is contained in:
Sam Atkins 2025-03-19 16:36:30 +00:00
parent 2c86fd539d
commit 193adee164
Notes: github-actions[bot] 2025-03-24 09:51:08 +00:00
3 changed files with 89 additions and 3 deletions
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48
Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateCSSPseudoElement.cpp
View file

@ -64,7 +64,11 @@ namespace Web::CSS {
enum class PseudoElement : @pseudo_element_underlying_type@ {
)~~~");
pseudo_elements_data.for_each_member([&](auto& name, auto&) {
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;
auto member_generator = generator.fork();
member_generator.set("name:titlecase", title_casify(name));
@ -77,6 +81,7 @@ enum class PseudoElement : @pseudo_element_underlying_type@ {
};
Optional<PseudoElement> pseudo_element_from_string(StringView);
Optional<PseudoElement> aliased_pseudo_element_from_string(StringView);
StringView pseudo_element_name(PseudoElement);
bool is_has_allowed_pseudo_element(PseudoElement);
@ -119,7 +124,10 @@ Optional<PseudoElement> pseudo_element_from_string(StringView string)
{
)~~~");
pseudo_elements_data.for_each_member([&](auto& name, auto&) {
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;
auto member_generator = generator.fork();
member_generator.set("name", name);
member_generator.set("name:titlecase", title_casify(name));
@ -135,12 +143,40 @@ Optional<PseudoElement> pseudo_element_from_string(StringView string)
return {};
}
Optional<PseudoElement> aliased_pseudo_element_from_string(StringView string)
{
)~~~");
pseudo_elements_data.for_each_member([&](auto& name, JsonValue const& value) {
auto& pseudo_element = value.as_object();
auto alias_for = pseudo_element.get_string("alias-for"sv);
if (!alias_for.has_value())
return;
auto member_generator = generator.fork();
member_generator.set("name", name);
member_generator.set("alias:titlecase", title_casify(alias_for.value()));
member_generator.append(R"~~~(
if (string.equals_ignoring_ascii_case("@name@"sv))
return PseudoElement::@alias:titlecase@;
)~~~");
});
generator.append(R"~~~(
return {};
}
StringView pseudo_element_name(PseudoElement pseudo_element)
{
switch (pseudo_element) {
)~~~");
pseudo_elements_data.for_each_member([&](auto& name, auto&) {
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;
auto member_generator = generator.fork();
member_generator.set("name", name);
member_generator.set("name:titlecase", title_casify(name));
@ -166,6 +202,8 @@ bool is_has_allowed_pseudo_element(PseudoElement 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-allowed-in-has"sv).value_or(false))
return;
@ -191,6 +229,8 @@ Optional<GeneratedPseudoElement> to_generated_pseudo_element(PseudoElement pseud
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-generated"sv).value_or(false))
return;
@ -215,6 +255,8 @@ PseudoElement to_pseudo_element(GeneratedPseudoElement generated_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-generated"sv).value_or(false))
return;