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LibWeb/CSS: Parse local() font sources more correctly

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There were several issues with the previous parsing code, like ignoring
trailing tokens, not handling whitespace, and not requiring the value
to be a `<family-name>`. So, fix all that.

Also correct the serialization code, which didn't call
`serialize_a_string()` previously.
This commit is contained in:
Sam Atkins 2025-03-24 17:20:08 +00:00 • committed by Andreas Kling
parent 93a2c9946f
commit 285fbc8f1c
Notes: github-actions[bot] 2025-03-25 07:54:56 +00:00
2 changed files with 30 additions and 7 deletions
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23
Libraries/LibWeb/CSS/Parser/RuleParsing.cpp
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@ -28,6 +28,7 @@
#include <LibWeb/CSS/Parser/Parser.h>
#include <LibWeb/CSS/PropertyName.h>
#include <LibWeb/CSS/StyleValues/CSSKeywordValue.h>
#include <LibWeb/CSS/StyleValues/CustomIdentStyleValue.h>
#include <LibWeb/CSS/StyleValues/IntegerStyleValue.h>
#include <LibWeb/CSS/StyleValues/NumberStyleValue.h>
#include <LibWeb/CSS/StyleValues/OpenTypeTaggedStyleValue.h>
@ -669,10 +670,28 @@ Vector<ParsedFontFace::Source> Parser::parse_font_face_src(TokenStream<T>& compo
auto const& first = source_tokens.consume_a_token();
if (first.is_function("local"sv)) {
// local(<family-name>)
if (first.function().value.is_empty()) {
continue;
dbgln_if(CSS_PARSER_DEBUG, "CSSParser: @font-face src invalid (`local()` syntax is invalid: no arguments); discarding.");
return {};
}
supported_sources.empend(FlyString { first.function().value.first().to_string() }, Optional<FlyString> {});
TokenStream function_tokens { first.function().value };
function_tokens.discard_whitespace();
auto font_family = parse_family_name_value(function_tokens);
function_tokens.discard_whitespace();
if (!font_family || function_tokens.has_next_token()) {
dbgln_if(CSS_PARSER_DEBUG, "CSSParser: @font-face src invalid (`local()` syntax is invalid: `{}`); discarding.", first.function().original_source_text());
return {};
}
if (font_family->is_string())
supported_sources.empend(font_family->as_string().string_value(), Optional<FlyString> {});
else if (font_family->is_custom_ident())
supported_sources.empend(font_family->as_custom_ident().custom_ident(), Optional<FlyString> {});
else
VERIFY_NOT_REACHED();
continue;
}