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LibWeb/CSS: Make @page selector parsing accessible

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Mostly minor changes - the code has moved, and has to support Token or
ComponentValue TokenStreams, but otherwise it's the same.
This commit is contained in:
Sam Atkins 2025-05-16 11:37:53 +01:00
parent 107b47f884
commit d852ae17e8
Notes: github-actions[bot] 2025-05-16 15:45:11 +00:00
4 changed files with 87 additions and 64 deletions
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67
Libraries/LibWeb/CSS/Parser/RuleParsing.cpp
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@ -639,74 +639,13 @@ GC::Ptr<CSSFontFaceRule> Parser::convert_to_font_face_rule(AtRule const& rule)
return CSSFontFaceRule::create(realm(), CSSFontFaceDescriptors::create(realm(), descriptors.release_descriptors()));
}
static Optional<PageSelectorList> parse_page_selector_list(Vector<ComponentValue> const& component_values)
{
// https://drafts.csswg.org/css-page-3/#syntax-page-selector
// <page-selector-list> = <page-selector>#
// <page-selector> = [ <ident-token>? <pseudo-page>* ]!
// <pseudo-page> = : [ left | right | first | blank ]
PageSelectorList selector_list;
TokenStream tokens { component_values };
tokens.discard_whitespace();
while (tokens.has_next_token()) {
// First optional ident
Optional<FlyString> maybe_ident;
if (tokens.next_token().is(Token::Type::Ident))
maybe_ident = tokens.consume_a_token().token().ident();
// Then an optional series of pseudo-classes
Vector<PagePseudoClass> pseudo_classes;
while (tokens.next_token().is(Token::Type::Colon)) {
tokens.discard_a_token(); // :
if (!tokens.next_token().is(Token::Type::Ident)) {
dbgln_if(CSS_PARSER_DEBUG, "Invalid @page selector: pseudo-class is not an ident: `{}`", tokens.next_token().to_debug_string());
return {};
}
auto pseudo_class_name = tokens.consume_a_token().token().ident();
if (auto pseudo_class = page_pseudo_class_from_string(pseudo_class_name); pseudo_class.has_value()) {
pseudo_classes.append(*pseudo_class);
} else {
dbgln_if(CSS_PARSER_DEBUG, "Invalid @page selector: unrecognized pseudo-class `:{}`", pseudo_class_name);
return {};
}
}
if (!maybe_ident.has_value() && pseudo_classes.is_empty()) {
// Nothing parsed
dbgln_if(CSS_PARSER_DEBUG, "Invalid @page selector: is empty");
return {};
}
selector_list.empend(move(maybe_ident), move(pseudo_classes));
tokens.discard_whitespace();
if (tokens.next_token().is(Token::Type::Comma)) {
tokens.discard_a_token(); // ,
tokens.discard_whitespace();
if (!tokens.has_next_token()) {
dbgln_if(CSS_PARSER_DEBUG, "Invalid @page selector: trailing comma");
return {};
}
} else if (tokens.has_next_token()) {
dbgln_if(CSS_PARSER_DEBUG, "Invalid @page selector: trailing token `{}`", tokens.next_token().to_debug_string());
return {};
}
}
return selector_list;
}
GC::Ptr<CSSPageRule> Parser::convert_to_page_rule(AtRule const& page_rule)
{
// https://drafts.csswg.org/css-page-3/#syntax-page-selector
// @page = @page <page-selector-list>? { <declaration-rule-list> }
auto page_selectors = parse_page_selector_list(page_rule.prelude);
if (!page_selectors.has_value())
TokenStream tokens { page_rule.prelude };
auto page_selectors = parse_a_page_selector_list(tokens);
if (page_selectors.is_error())
return nullptr;
GC::RootVector<GC::Ref<CSSRule>> child_rules { realm().heap() };