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LibWeb: Parse background positions as shorthands

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Gingeh 2024-12-29 21:07:59 +11:00 committed by Andreas Kling
parent abc0418710
commit 436417aabe
Notes: github-actions[bot] 2024-12-30 10:08:44 +00:00 
Author: https://github.com/Gingeh
Commit: https://github.com/LadybirdBrowser/ladybird/commit/436417aabeb
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/3082
3 changed files with 41 additions and 12 deletions
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38
Libraries/LibWeb/CSS/Parser/Parser.cpp
View file

@ -4291,7 +4291,8 @@ RefPtr<CSSStyleValue> Parser::parse_background_value(TokenStream<ComponentValue>
};
StyleValueVector background_images;
StyleValueVector background_positions;
StyleValueVector background_position_xs;
StyleValueVector background_position_ys;
StyleValueVector background_sizes;
StyleValueVector background_repeats;
StyleValueVector background_attachments;
@ -4300,7 +4301,8 @@ RefPtr<CSSStyleValue> Parser::parse_background_value(TokenStream<ComponentValue>
RefPtr<CSSStyleValue> background_color;
auto initial_background_image = property_initial_value(PropertyID::BackgroundImage);
auto initial_background_position = property_initial_value(PropertyID::BackgroundPosition);
auto initial_background_position_x = property_initial_value(PropertyID::BackgroundPositionX);
auto initial_background_position_y = property_initial_value(PropertyID::BackgroundPositionY);
auto initial_background_size = property_initial_value(PropertyID::BackgroundSize);
auto initial_background_repeat = property_initial_value(PropertyID::BackgroundRepeat);
auto initial_background_attachment = property_initial_value(PropertyID::BackgroundAttachment);
@ -4310,7 +4312,8 @@ RefPtr<CSSStyleValue> Parser::parse_background_value(TokenStream<ComponentValue>
// Per-layer values
RefPtr<CSSStyleValue> background_image;
RefPtr<CSSStyleValue> background_position;
RefPtr<CSSStyleValue> background_position_x;
RefPtr<CSSStyleValue> background_position_y;
RefPtr<CSSStyleValue> background_size;
RefPtr<CSSStyleValue> background_repeat;
RefPtr<CSSStyleValue> background_attachment;
@ -4337,12 +4340,13 @@ RefPtr<CSSStyleValue> Parser::parse_background_value(TokenStream<ComponentValue>
if (background_color)
return false;
}
return background_image || background_position || background_size || background_repeat || background_attachment || background_clip || background_origin;
return background_image || background_position_x || background_position_y || background_size || background_repeat || background_attachment || background_clip || background_origin;
};
auto complete_background_layer = [&]() {
background_images.append(background_image ? background_image.release_nonnull() : initial_background_image);
background_positions.append(background_position ? background_position.release_nonnull() : initial_background_position);
background_position_xs.append(background_position_x ? background_position_x.release_nonnull() : initial_background_position_x);
background_position_ys.append(background_position_y ? background_position_y.release_nonnull() : initial_background_position_y);
background_sizes.append(background_size ? background_size.release_nonnull() : initial_background_size);
background_repeats.append(background_repeat ? background_repeat.release_nonnull() : initial_background_repeat);
background_attachments.append(background_attachment ? background_attachment.release_nonnull() : initial_background_attachment);
@ -4357,7 +4361,8 @@ RefPtr<CSSStyleValue> Parser::parse_background_value(TokenStream<ComponentValue>
background_clips.append(background_clip.release_nonnull());
background_image = nullptr;
background_position = nullptr;
background_position_x = nullptr;
background_position_y = nullptr;
background_size = nullptr;
background_repeat = nullptr;
background_attachment = nullptr;
@ -4421,8 +4426,10 @@ RefPtr<CSSStyleValue> Parser::parse_background_value(TokenStream<ComponentValue>
continue;
}
case PropertyID::BackgroundPosition: {
VERIFY(!background_position);
background_position = value.release_nonnull();
VERIFY(!background_position_x && !background_position_y);
auto position = value.release_nonnull();
background_position_x = position->as_position().edge_x();
background_position_y = position->as_position().edge_y();
// Attempt to parse `/ <background-size>`
auto background_size_transaction = tokens.begin_transaction();
@ -4467,7 +4474,10 @@ RefPtr<CSSStyleValue> Parser::parse_background_value(TokenStream<ComponentValue>
return make_background_shorthand(
background_color.release_nonnull(),
StyleValueList::create(move(background_images), StyleValueList::Separator::Comma),
StyleValueList::create(move(background_positions), StyleValueList::Separator::Comma),
ShorthandStyleValue::create(PropertyID::BackgroundPosition,
{ PropertyID::BackgroundPositionX, PropertyID::BackgroundPositionY },
{ StyleValueList::create(move(background_position_xs), StyleValueList::Separator::Comma),
StyleValueList::create(move(background_position_ys), StyleValueList::Separator::Comma) }),
StyleValueList::create(move(background_sizes), StyleValueList::Separator::Comma),
StyleValueList::create(move(background_repeats), StyleValueList::Separator::Comma),
StyleValueList::create(move(background_attachments), StyleValueList::Separator::Comma),
@ -4479,8 +4489,10 @@ RefPtr<CSSStyleValue> Parser::parse_background_value(TokenStream<ComponentValue>
background_color = initial_background_color;
if (!background_image)
background_image = initial_background_image;
if (!background_position)
background_position = initial_background_position;
if (!background_position_x)
background_position_x = initial_background_position_x;
if (!background_position_y)
background_position_y = initial_background_position_y;
if (!background_size)
background_size = initial_background_size;
if (!background_repeat)
@ -4499,7 +4511,9 @@ RefPtr<CSSStyleValue> Parser::parse_background_value(TokenStream<ComponentValue>
return make_background_shorthand(
background_color.release_nonnull(),
background_image.release_nonnull(),
background_position.release_nonnull(),
ShorthandStyleValue::create(PropertyID::BackgroundPosition,
{ PropertyID::BackgroundPositionX, PropertyID::BackgroundPositionY },
{ background_position_x.release_nonnull(), background_position_y.release_nonnull() }),
background_size.release_nonnull(),
background_repeat.release_nonnull(),
background_attachment.release_nonnull(),

2
Tests/LibWeb/Text/expected/background-style-declaration-cssText-crash.txt Normal file
View file

@ -0,0 +1,2 @@
:root { background: transparent none 1px 1px auto auto repeat scroll padding-box border-box; }
PASS (didn't crash)

13
Tests/LibWeb/Text/input/background-style-declaration-cssText-crash.html Normal file
View file

@ -0,0 +1,13 @@
<!DOCTYPE html>
<script src="include.js"></script>
<style>
:root {
background: 1px 1px;
}
</style>
<script>
test(() => {
println(document.styleSheets[0].cssRules[0].cssText);
println("PASS (didn't crash)");
});
</script>