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LibWeb: Add basic implementation of @page

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This doesn't support selectors, and the only descriptors for now are for
margins.
This commit is contained in:
Sam Atkins 2025-05-13 12:17:41 +01:00
commit aaf07ae30d
Notes: github-actions[bot] 2025-05-15 08:54:53 +00:00
27 changed files with 471 additions and 20 deletions
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47
Libraries/LibWeb/CSS/Parser/RuleParsing.cpp
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@ -21,6 +21,7 @@
#include <LibWeb/CSS/CSSMediaRule.h>
#include <LibWeb/CSS/CSSNamespaceRule.h>
#include <LibWeb/CSS/CSSNestedDeclarations.h>
#include <LibWeb/CSS/CSSPageRule.h>
#include <LibWeb/CSS/CSSPropertyRule.h>
#include <LibWeb/CSS/CSSStyleProperties.h>
#include <LibWeb/CSS/CSSStyleRule.h>
@ -64,12 +65,15 @@ GC::Ptr<CSSRule> Parser::convert_to_rule(Rule const& rule, Nested nested)
if (at_rule.name.equals_ignoring_ascii_case("namespace"sv))
return convert_to_namespace_rule(at_rule);
if (at_rule.name.equals_ignoring_ascii_case("supports"sv))
return convert_to_supports_rule(at_rule, nested);
if (at_rule.name.equals_ignoring_ascii_case("page"sv))
return convert_to_page_rule(at_rule);
if (at_rule.name.equals_ignoring_ascii_case("property"sv))
return convert_to_property_rule(at_rule);
if (at_rule.name.equals_ignoring_ascii_case("supports"sv))
return convert_to_supports_rule(at_rule, nested);
// FIXME: More at rules!
dbgln_if(CSS_PARSER_DEBUG, "Unrecognized CSS at-rule: @{}", at_rule.name);
return {};
@ -596,4 +600,43 @@ GC::Ptr<CSSFontFaceRule> Parser::convert_to_font_face_rule(AtRule const& rule)
return CSSFontFaceRule::create(realm(), CSSFontFaceDescriptors::create(realm(), move(descriptors)));
}
GC::Ptr<CSSPageRule> Parser::convert_to_page_rule(AtRule const& rule)
{
// https://drafts.csswg.org/css-page-3/#syntax-page-selector
// @page = @page <page-selector-list>? { <declaration-rule-list> }
// <page-selector-list> = <page-selector>#
// <page-selector> = [ <ident-token>? <pseudo-page>* ]!
// <pseudo-page> = : [ left | right | first | blank ]
SelectorList page_selectors;
// FIXME: Parse page selectors
if (rule.prelude.find_first_index_if([](ComponentValue const& it) { return !it.is(Token::Type::Whitespace); }).has_value()) {
dbgln("@page prelude wasn't empty!");
return nullptr;
}
GC::RootVector<GC::Ref<CSSRule>> child_rules { realm().heap() };
Vector<Descriptor> descriptors;
HashTable<DescriptorID> seen_descriptor_ids;
rule.for_each_as_declaration_rule_list(
[&](auto& at_rule) {
// FIXME: Parse margin rules here.
(void)at_rule;
},
[&](auto& declaration) {
if (auto descriptor = convert_to_descriptor(AtRuleID::Page, declaration); descriptor.has_value()) {
if (seen_descriptor_ids.contains(descriptor->descriptor_id)) {
descriptors.remove_first_matching([&descriptor](Descriptor const& existing) {
return existing.descriptor_id == descriptor->descriptor_id;
});
} else {
seen_descriptor_ids.set(descriptor->descriptor_id);
}
descriptors.append(descriptor.release_value());
}
});
auto rule_list = CSSRuleList::create(realm(), child_rules);
return CSSPageRule::create(realm(), move(page_selectors), CSSPageDescriptors::create(realm(), move(descriptors)), rule_list);
}
}