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LibWeb: Allow optional values to be missing when parsing <position>s

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MacDue 2022-11-08 20:50:00 +01:00 • committed by Sam Atkins
parent b7d436fe1b
commit c02163c31f
2 changed files with 30 additions and 22 deletions
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50
Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
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@ -2644,7 +2644,7 @@ RefPtr<StyleValue> Parser::parse_conic_gradient_function(ComponentValue const& c
return ConicGradientStyleValue::create(from_angle, at_position, move(*color_stops), repeating_gradient);
}
Optional<PositionValue> Parser::parse_position(TokenStream<ComponentValue>& tokens)
Optional<PositionValue> Parser::parse_position(TokenStream<ComponentValue>& tokens, PositionValue initial_value)
{
auto transaction = tokens.begin_transaction();
tokens.skip_whitespace();
@ -2700,7 +2700,7 @@ Optional<PositionValue> Parser::parse_position(TokenStream<ComponentValue>& toke
// [ left | center | right ] || [ top | center | bottom ]
auto alternation_1 = [&]() -> Optional<PositionValue> {
auto transaction = tokens.begin_transaction();
PositionValue position {};
PositionValue position = initial_value;
auto& first_token = tokens.next_token();
if (!first_token.is(Token::Type::Ident))
return {};
@ -2709,15 +2709,17 @@ Optional<PositionValue> Parser::parse_position(TokenStream<ComponentValue>& toke
auto horizontal_position = parse_horizontal_preset(ident);
if (horizontal_position.has_value()) {
position.horizontal_position = *horizontal_position;
auto transaction_optional_parse = tokens.begin_transaction();
tokens.skip_whitespace();
if (tokens.has_next_token()) {
auto& second_token = tokens.next_token();
if (!second_token.is(Token::Type::Ident))
return {};
auto vertical_position = parse_vertical_preset(second_token.token().ident());
if (!vertical_position.has_value())
return {};
position.vertical_position = *vertical_position;
if (second_token.is(Token::Type::Ident)) {
auto vertical_position = parse_vertical_preset(second_token.token().ident());
if (vertical_position.has_value()) {
transaction_optional_parse.commit();
position.vertical_position = *vertical_position;
}
}
}
} else {
// <vertical-position> <horizontal-position>?
@ -2725,14 +2727,17 @@ Optional<PositionValue> Parser::parse_position(TokenStream<ComponentValue>& toke
if (!vertical_position.has_value())
return {};
position.vertical_position = *vertical_position;
auto transaction_optional_parse = tokens.begin_transaction();
tokens.skip_whitespace();
if (tokens.has_next_token()) {
auto& second_token = tokens.next_token();
if (!second_token.is(Token::Type::Ident))
return {};
auto horizontal_position = parse_horizontal_preset(second_token.token().ident());
if (!horizontal_position.has_value())
return {};
position.horizontal_position = *horizontal_position;
if (second_token.is(Token::Type::Ident)) {
auto horizontal_position = parse_horizontal_preset(second_token.token().ident());
if (horizontal_position.has_value()) {
transaction_optional_parse.commit();
position.horizontal_position = *horizontal_position;
}
}
}
}
transaction.commit();
@ -2743,7 +2748,7 @@ Optional<PositionValue> Parser::parse_position(TokenStream<ComponentValue>& toke
// [ top | center | bottom | <length-percentage> ]?
auto alternation_2 = [&]() -> Optional<PositionValue> {
auto transaction = tokens.begin_transaction();
PositionValue position {};
PositionValue position = initial_value;
auto& first_token = tokens.next_token();
if (first_token.is(Token::Type::Ident)) {
auto horizontal_position = parse_horizontal_preset(first_token.token().ident());
@ -2756,19 +2761,22 @@ Optional<PositionValue> Parser::parse_position(TokenStream<ComponentValue>& toke
return {};
position.horizontal_position = dimension->length_percentage();
}
auto transaction_optional_parse = tokens.begin_transaction();
tokens.skip_whitespace();
if (tokens.has_next_token()) {
auto& second_token = tokens.next_token();
if (second_token.is(Token::Type::Ident)) {
auto vertical_position = parse_vertical_preset(second_token.token().ident());
if (!vertical_position.has_value())
return {};
position.vertical_position = *vertical_position;
if (vertical_position.has_value()) {
transaction_optional_parse.commit();
position.vertical_position = *vertical_position;
}
} else {
auto dimension = parse_dimension(second_token);
if (!dimension.has_value() || !dimension->is_length_percentage())
return {};
position.vertical_position = dimension->length_percentage();
if (dimension.has_value() && dimension->is_length_percentage()) {
transaction_optional_parse.commit();
position.vertical_position = dimension->length_percentage();
}
}
}
transaction.commit();