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LibWeb: Don't allow mixed commas/no commas in rect() css values

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This fixes the clip-rect-comma-002, clip-rect-comma-003, and
clip-rect-comma-004 web platform tests.
This commit is contained in:
MacDue 2022-08-07 23:31:16 +01:00 • committed by Andreas Kling
parent 9c8aa5b777
commit 361fc56632
Notes: sideshowbarker 2024-07-17 10:10:18 +09:00
1 changed files with 40 additions and 3 deletions
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43
Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
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@ -3363,10 +3363,25 @@ RefPtr<StyleValue> Parser::parse_rect_value(ComponentValue const& component_valu
Vector<Length, 4> params;
auto tokens = TokenStream { function.values() };
enum class CommaRequirement {
Unknown,
RequiresCommas,
RequiresNoCommas
};
enum class Side {
Top = 0,
Right = 1,
Bottom = 2,
Left = 3
};
auto comma_requirement = CommaRequirement::Unknown;
// In CSS 2.1, the only valid <shape> value is: rect(<top>, <right>, <bottom>, <left>) where
// <top> and <bottom> specify offsets from the top border edge of the box, and <right>, and
// <left> specify offsets from the left border edge of the box.
for (size_t idx = 0; idx < 4; idx++) {
for (size_t side = 0; side < 4; side++) {
tokens.skip_whitespace();
// <top>, <right>, <bottom>, and <left> may either have a <length> value or 'auto'.
@ -3382,12 +3397,34 @@ RefPtr<StyleValue> Parser::parse_rect_value(ComponentValue const& component_valu
}
tokens.skip_whitespace();
// The last side, should be no more tokens following it.
if (static_cast<Side>(side) == Side::Left) {
if (tokens.has_next_token())
return {};
break;
}
bool next_is_comma = tokens.peek_token().is(Token::Type::Comma);
// Authors should separate offset values with commas. User agents must support separation
// with commas, but may also support separation without commas (but not a combination),
// because a previous revision of this specification was ambiguous in this respect.
if (tokens.peek_token().is(Token::Type::Comma))
tokens.next_token();
if (comma_requirement == CommaRequirement::Unknown)
comma_requirement = next_is_comma ? CommaRequirement::RequiresCommas : CommaRequirement::RequiresNoCommas;
if (comma_requirement == CommaRequirement::RequiresCommas) {
if (next_is_comma)
tokens.next_token();
else
return {};
} else if (comma_requirement == CommaRequirement::RequiresNoCommas) {
if (next_is_comma)
return {};
} else {
VERIFY_NOT_REACHED();
}
}
return RectStyleValue::create(EdgeRect { params[0], params[1], params[2], params[3] });
}