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LibWeb: Parse box-shadow in the DeprecatedCSSParser

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This adds support for box-shadows to the DeprecatedCSSParser. When it
encounters a box-shadow property, the following syntaxes can get parsed:
- box-shadow: <offset_x> <offset_y> <color>
- box-shadow: <offset_x> <offset_y> <blur_radius> <color>

There is other possible data following the property, but those aren't
supported for now.
This commit is contained in:
Tobias Christiansen 2021-07-23 21:28:48 +02:00 committed by Andreas Kling
parent f1bdaafcf6
commit 281689e1fa
Notes: sideshowbarker 2024-07-18 08:23:02 +09:00 
Author: https://github.com/TobyAsE
Commit: https://github.com/SerenityOS/serenity/commit/281689e1fa0
Pull-request: https://github.com/SerenityOS/serenity/pull/8968
1 changed files with 48 additions and 0 deletions
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48
Userland/Libraries/LibWeb/CSS/Parser/DeprecatedCSSParser.cpp
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@ -631,10 +631,58 @@ static OwnPtr<CSS::CalculatedStyleValue::CalcSum> parse_calc_sum(Vector<CalcToke
return make<CSS::CalculatedStyleValue::CalcSum>(parsed_calc_product.release_nonnull(), move(additional));
}
static RefPtr<CSS::BoxShadowStyleValue> parse_box_shadow(CSS::DeprecatedParsingContext const& context, StringView const& string)
{
// FIXME: Also support inset, spread-radius and multiple comma-seperated box-shadows
CSS::Length offset_x {};
CSS::Length offset_y {};
CSS::Length blur_radius {};
Color color {};
auto parts = string.split_view(' ');
if (parts.size() < 3 || parts.size() > 4)
return nullptr;
bool bad_length = false;
offset_x = parse_length(context, parts[0], bad_length);
if (bad_length)
return nullptr;
bad_length = false;
offset_y = parse_length(context, parts[1], bad_length);
if (bad_length)
return nullptr;
if (parts.size() == 3) {
auto parsed_color = parse_color(context, parts[2]);
if (!parsed_color)
return nullptr;
color = parsed_color->color();
} else if (parts.size() == 4) {
bad_length = false;
blur_radius = parse_length(context, parts[2], bad_length);
if (bad_length)
return nullptr;
auto parsed_color = parse_color(context, parts[3]);
if (!parsed_color)
return nullptr;
color = parsed_color->color();
}
return CSS::BoxShadowStyleValue::create(offset_x, offset_y, blur_radius, color);
}
RefPtr<CSS::StyleValue> parse_css_value(const CSS::DeprecatedParsingContext& context, const StringView& string, CSS::PropertyID property_id)
{
bool is_bad_length = false;
if (property_id == CSS::PropertyID::BoxShadow) {
auto parsed_box_shadow = parse_box_shadow(context, string);
if (parsed_box_shadow)
return parsed_box_shadow;
}
if (takes_integer_value(property_id)) {
auto integer = string.to_int();
if (integer.has_value())