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LibWeb: Stop allowing invalid tokens in display values

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Previously we were overly generous in what we accepted for `display`.
For example, we accepted:
- Multiple outside or inside identifiers
- Unrecognized identifiers
- Non-identifier tokens

Now, we reject all these cases. This makes us stop accepting the
`display: block math;` declaration in `MathML/Default.css`, and so the
one layout test we have containing MathML elements has changed to
reflect that.
This commit is contained in:
Sam Atkins 2023-09-04 16:37:34 +01:00 • committed by Sam Atkins
parent 7bf842a974
commit 3b0980c89f
2 changed files with 38 additions and 31 deletions
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40
Tests/LibWeb/Layout/expected/css-namespace-tag-name-selector.txt
View file

@ -1,41 +1,39 @@
Viewport <#document> at (0,0) content-size 800x600 children: not-inline
BlockContainer <html> at (0,0) content-size 800x600 [BFC] children: not-inline
BlockContainer <body> at (8,8) content-size 784x299.6875 children: not-inline
BlockContainer <(anonymous)> at (8,8) content-size 784x152 children: inline
line 0 width: 302, height: 152, bottom: 152, baseline: 152
BlockContainer <body> at (8,8) content-size 784x201.125 children: not-inline
BlockContainer <(anonymous)> at (8,8) content-size 784x155.46875 children: inline
line 0 width: 312, height: 155.46875, bottom: 155.46875, baseline: 152
frag 0 from SVGSVGBox start: 0, length: 0, rect: [9,9 300x150]
frag 1 from TextNode start: 0, length: 1, rect: [310,146 8x17.46875]
" "
frag 2 from Box start: 0, length: 0, rect: [319,51 0x108]
SVGSVGBox <svg> at (9,9) content-size 300x150 [SVG] children: inline
InlineNode <a>
SVGTextBox <text> at (9,9) content-size 0x0 children: inline
TextNode <#text>
TextNode <#text>
InlineNode <math>
BlockContainer <a> at (9,161) content-size 100x100 children: inline
line 0 width: 99.453125, height: 43.6875, bottom: 43.6875, baseline: 33.84375
frag 0 from TextNode start: 0, length: 5, rect: [9,161 99.453125x43.671875]
"Hello"
Box <math> at (319,51) content-size 0x108 children: not-inline
Box <a> at (8,8) content-size 100x100 children: inline
TextNode <#text>
TextNode <#text>
BlockContainer <(anonymous)> at (8,262) content-size 784x0 children: inline
TextNode <#text>
BlockContainer <div> at (9,263) content-size 782x43.6875 children: inline
line 0 width: 101.453125, height: 43.6875, bottom: 43.6875, baseline: 33.84375
frag 0 from TextNode start: 0, length: 5, rect: [10,263 99.453125x43.671875]
BlockContainer <div> at (9,164.46875) content-size 782x43.65625 children: inline
line 0 width: 101.453125, height: 43.65625, bottom: 43.65625, baseline: 33.828125
frag 0 from TextNode start: 0, length: 5, rect: [10,164.46875 99.453125x43.671875]
"Hello"
InlineNode <a>
TextNode <#text>
BlockContainer <(anonymous)> at (8,307.6875) content-size 784x0 children: inline
BlockContainer <(anonymous)> at (8,209.125) content-size 784x0 children: inline
TextNode <#text>
ViewportPaintable (Viewport<#document>) [0,0 800x600]
PaintableWithLines (BlockContainer<HTML>) [0,0 800x600]
PaintableWithLines (BlockContainer<BODY>) [8,8 784x299.6875]
PaintableWithLines (BlockContainer(anonymous)) [8,8 784x152]
PaintableWithLines (BlockContainer<BODY>) [8,8 784x201.125]
PaintableWithLines (BlockContainer(anonymous)) [8,8 784x155.46875]
SVGSVGPaintable (SVGSVGBox<svg>) [8,8 302x152]
InlinePaintable (InlineNode<math>)
PaintableWithLines (BlockContainer<a>) [8,160 102x102]
TextPaintable (TextNode<#text>)
PaintableWithLines (BlockContainer(anonymous)) [8,262 784x0]
PaintableWithLines (BlockContainer<DIV>) [8,262 784x45.6875]
PaintableBox (Box<math>) [318,50 2x110] overflow: [8,8 100x100]
PaintableBox (Box<a>) [8,8 100x100]
PaintableWithLines (BlockContainer<DIV>) [8,163.46875 784x45.65625] overflow: [9,164.46875 782x43.671875]
InlinePaintable (InlineNode<A>)
TextPaintable (TextNode<#text>)
PaintableWithLines (BlockContainer(anonymous)) [8,307.6875 784x0]
PaintableWithLines (BlockContainer(anonymous)) [8,209.125 784x0]

29
Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
View file

@ -3655,34 +3655,43 @@ RefPtr<StyleValue> Parser::parse_display_value(Vector<ComponentValue> const& com
auto parse_multi_component_display = [&](Vector<ComponentValue> const& component_values) -> Optional<Display> {
auto list_item = Display::ListItem::No;
Display::Inside inside = Display::Inside::Flow;
Display::Outside outside = Display::Outside::Block;
Optional<Display::Inside> inside;
Optional<Display::Outside> outside;
for (size_t i = 0; i < component_values.size(); ++i) {
if (auto value = parse_identifier_value(component_values[i])) {
auto identifier = value->to_identifier();
if (ValueID::ListItem == identifier) {
if (identifier == ValueID::ListItem) {
if (list_item == Display::ListItem::Yes)
return {};
list_item = Display::ListItem::Yes;
continue;
}
auto inside_value = parse_inside(identifier);
if (inside_value.has_value()) {
if (auto inside_value = parse_inside(identifier); inside_value.has_value()) {
if (inside.has_value())
return {};
inside = inside_value.value();
continue;
}
auto outside_value = parse_outside(identifier);
if (outside_value.has_value()) {
if (auto outside_value = parse_outside(identifier); outside_value.has_value()) {
if (outside.has_value())
return {};
outside = outside_value.value();
continue;
}
}
// Not a display value, abort.
dbgln_if(CSS_PARSER_DEBUG, "Unrecognized display value: `{}`", component_values[i].to_string());
return {};
}
// The spec does not allow any other inside values to be combined with list-item
// <display-outside>? && [ flow | flow-root ]? && list-item
if (list_item == Display::ListItem::Yes && inside != Display::Inside::Flow && inside != Display::Inside::FlowRoot)
return OptionalNone {};
if (list_item == Display::ListItem::Yes && inside.has_value() && inside != Display::Inside::Flow && inside != Display::Inside::FlowRoot)
return {};
return Display { outside, inside, list_item };
return Display { outside.value_or(Display::Outside::Block), inside.value_or(Display::Inside::Flow), list_item };
};
Optional<Display> display;