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LibWeb: Fix crash parsing an invalid pseudo compound selector
Reduced from a crash on: https://github.com/SerenityOS/serenity/pulls Fixes #20568
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@ -0,0 +1,11 @@
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Viewport <#document> at (0,0) content-size 800x600 children: not-inline
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BlockContainer <html> at (0,0) content-size 800x600 [BFC] children: not-inline
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BlockContainer <body> at (8,8) content-size 784x0 children: not-inline
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BlockContainer <div> at (8,8) content-size 784x0 children: inline
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TextNode <#text>
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TextNode <#text>
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PaintableWithLines (Viewport<#document>) [0,0 800x600]
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PaintableWithLines (BlockContainer<HTML>) [0,0 800x600]
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PaintableWithLines (BlockContainer<BODY>) [8,8 784x0]
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PaintableWithLines (BlockContainer<DIV>) [8,8 784x0]
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@ -0,0 +1,5 @@
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<div>
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<style>
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:host(:thing) {}
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</style>
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</div>
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@ -635,13 +635,13 @@ Parser::ParseErrorOr<Selector::SimpleSelector> Parser::parse_pseudo_simple_selec
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return parse_nth_child_selector(pseudo_class, pseudo_function.values(), true);
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case PseudoClassMetadata::ParameterType::CompoundSelector: {
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auto function_token_stream = TokenStream(pseudo_function.values());
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auto compound_selector = MUST(parse_compound_selector(function_token_stream));
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if (!compound_selector.has_value()) {
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auto compound_selector_or_error = parse_compound_selector(function_token_stream);
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if (compound_selector_or_error.is_error() || !compound_selector_or_error.value().has_value()) {
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dbgln_if(CSS_PARSER_DEBUG, "Failed to parse :{}() parameter as a compound selector", pseudo_function.name());
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return ParseError::SyntaxError;
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}
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Vector compound_selectors { compound_selector.release_value() };
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Vector compound_selectors { compound_selector_or_error.release_value().release_value() };
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auto selector = Selector::create(move(compound_selectors));
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return Selector::SimpleSelector {
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