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LibWeb: Parse background-size property

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Sam Atkins 2021-11-05 13:44:37 +00:00 • committed by Andreas Kling
parent ae2a3bf185
commit 67214e0b61
5 changed files with 71 additions and 0 deletions
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39
Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
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@ -2751,6 +2751,41 @@ RefPtr<StyleValue> Parser::parse_background_repeat_value(ParsingContext const& c
return parse_single_background_repeat_value(context, tokens);
}
RefPtr<StyleValue> Parser::parse_single_background_size_value(ParsingContext const& context, TokenStream<StyleComponentValueRule>& tokens)
{
auto start_position = tokens.position();
auto error = [&]() {
tokens.rewind_to_position(start_position);
return nullptr;
};
auto maybe_x_value = parse_css_value(context, tokens.next_token());
if (!maybe_x_value || !property_accepts_value(PropertyID::BackgroundSize, *maybe_x_value))
return error();
auto x_value = maybe_x_value.release_nonnull();
if (x_value->to_identifier() == ValueID::Cover || x_value->to_identifier() == ValueID::Contain)
return x_value;
auto maybe_y_value = parse_css_value(context, tokens.peek_token());
if (!maybe_y_value || !property_accepts_value(PropertyID::BackgroundSize, *maybe_y_value))
return BackgroundSizeStyleValue::create(x_value->to_length(), x_value->to_length());
tokens.next_token();
auto y_value = maybe_y_value.release_nonnull();
if (x_value->has_length() && y_value->has_length())
return BackgroundSizeStyleValue::create(x_value->to_length(), y_value->to_length());
return error();
}
RefPtr<StyleValue> Parser::parse_background_size_value(ParsingContext const& context, Vector<StyleComponentValueRule> const& component_values)
{
auto tokens = TokenStream { component_values };
// FIXME: Handle multiple sets of comma-separated values.
return parse_single_background_size_value(context, tokens);
}
RefPtr<StyleValue> Parser::parse_border_value(ParsingContext const& context, Vector<StyleComponentValueRule> const& component_values)
{
if (component_values.size() > 3)
@ -3473,6 +3508,10 @@ Result<NonnullRefPtr<StyleValue>, Parser::ParsingResult> Parser::parse_css_value
if (auto parsed_value = parse_background_repeat_value(m_context, component_values))
return parsed_value.release_nonnull();
return ParsingResult::SyntaxError;
case PropertyID::BackgroundSize:
if (auto parsed_value = parse_background_size_value(m_context, component_values))
return parsed_value.release_nonnull();
return ParsingResult::SyntaxError;
case PropertyID::Border:
case PropertyID::BorderBottom:
case PropertyID::BorderLeft: