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LibWeb: Parse rect style value

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Add ability to parse a rect when it is used as the value of a style
property.
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Tom 2022-07-31 18:46:35 +02:00 • committed by Andreas Kling
parent 4d1ceaaa43
commit b4dd477644
7 changed files with 117 additions and 0 deletions
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44
Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
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@ -27,6 +27,7 @@
#include <LibWeb/CSS/Parser/Parser.h>
#include <LibWeb/CSS/Parser/Rule.h>
#include <LibWeb/CSS/Selector.h>
#include <LibWeb/CSS/StyleValue.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/Dump.h>
@ -3350,6 +3351,46 @@ Optional<Color> Parser::parse_rgb_or_hsl_color(StringView function_name, Vector<
return {};
}
// https://www.w3.org/TR/CSS2/visufx.html#value-def-shape
RefPtr<StyleValue> Parser::parse_rect_value(ComponentValue const& component_value)
{
if (!component_value.is_function())
return {};
auto& function = component_value.function();
if (!function.name().equals_ignoring_case("rect"sv))
return {};
Vector<Length, 4> params;
auto tokens = TokenStream { function.values() };
// 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++) {
tokens.skip_whitespace();
// <top>, <right>, <bottom>, and <left> may either have a <length> value or 'auto'.
// Negative lengths are permitted.
auto current_token = tokens.next_token().token();
if (current_token.to_string() == "auto") {
params.append(Length::make_auto());
} else {
auto maybe_length = parse_length(current_token);
if (!maybe_length.has_value())
return {};
params.append(maybe_length.value());
}
tokens.skip_whitespace();
// 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();
}
return RectStyleValue::create(EdgeRect { params[0], params[1], params[2], params[3] });
}
Optional<Color> Parser::parse_color(ComponentValue const& component_value)
{
// https://www.w3.org/TR/css-color-4/
@ -5416,6 +5457,9 @@ RefPtr<StyleValue> Parser::parse_css_value(ComponentValue const& component_value
if (auto image = parse_image_value(component_value))
return image;
if (auto rect = parse_rect_value(component_value))
return rect;
return {};
}