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Add support for the !important attribute #843

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merged 4 commits into from
Nov 26, 2024
Merged

Add support for the !important attribute #843

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3bfad8f
Add support for !important attribute
LaurenzV Nov 7, 2024
63137a7
Update reference image
LaurenzV Nov 7, 2024
67e2ac4
Use short-hand variable
LaurenzV Nov 8, 2024
7470956
Fix edge case where both attributes are important
LaurenzV Nov 10, 2024
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Binary file modified crates/resvg/tests/tests/structure/style/important.png
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6 changes: 4 additions & 2 deletions crates/usvg/src/parser/svgtree/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -205,14 +205,16 @@ pub struct Attribute<'input> {
pub name: AId,
/// Attribute's value.
pub value: roxmltree::StringStorage<'input>,
/// Attribute's importance
pub important: bool
}

impl std::fmt::Debug for Attribute<'_> {
fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
write!(
f,
"Attribute {{ name: {:?}, value: {} }}",
self.name, self.value
"Attribute {{ name: {:?}, value: {}, important: {} }}",
self.name, self.value, self.important
)
}
}
Expand Down
71 changes: 41 additions & 30 deletions crates/usvg/src/parser/svgtree/parse.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -49,8 +49,8 @@ impl<'input> Document<'input> {
new_child_id
}

fn append_attribute(&mut self, name: AId, value: roxmltree::StringStorage<'input>) {
self.attrs.push(Attribute { name, value });
fn append_attribute(&mut self, name: AId, value: roxmltree::StringStorage<'input>, important: bool) {
self.attrs.push(Attribute { name, value, important });
}
}

Expand Down Expand Up @@ -251,10 +251,10 @@ pub(crate) fn parse_svg_element<'input>(
continue;
}

append_attribute(parent_id, tag_name, aid, attr.value_storage().clone(), doc);
append_attribute(parent_id, tag_name, aid, attr.value_storage().clone(), false, doc);
}

let mut insert_attribute = |aid, value: &str| {
let mut insert_attribute = |aid, value: &str, important: bool| {
// Check that attribute already exists.
let idx = doc.attrs[attrs_start_idx..]
.iter_mut()
Expand All @@ -266,15 +266,23 @@ pub(crate) fn parse_svg_element<'input>(
tag_name,
aid,
roxmltree::StringStorage::new_owned(value),
important,
doc,
);

// Check that attribute was actually added, because it could be skipped.
if added {
if let Some(idx) = idx {
// Swap the last attribute with an existing one.
let last_idx = doc.attrs.len() - 1;
doc.attrs.swap(attrs_start_idx + idx, last_idx);
let existing_idx = attrs_start_idx + idx;

// Swap the last attribute with an existing one. However, if the currently existing
// attribute is important and the new one not, we don't want to overwrite it, since
// the important one takes precedence.
if !(doc.attrs[existing_idx].important && !doc.attrs[last_idx].important) {
doc.attrs.swap(existing_idx, last_idx);
}

// Remove last.
doc.attrs.pop();
}
Expand All @@ -284,40 +292,40 @@ pub(crate) fn parse_svg_element<'input>(
let mut write_declaration = |declaration: &Declaration| {
// TODO: perform XML attribute normalization
if declaration.name == "marker" {
insert_attribute(AId::MarkerStart, declaration.value);
insert_attribute(AId::MarkerMid, declaration.value);
insert_attribute(AId::MarkerEnd, declaration.value);
insert_attribute(AId::MarkerStart, declaration.value, declaration.important);
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insert_attribute(AId::MarkerMid, declaration.value, declaration.important);
insert_attribute(AId::MarkerEnd, declaration.value, declaration.important);
} else if declaration.name == "font" {
if let Ok(shorthand) = FontShorthand::from_str(declaration.value) {
// First we need to reset all values to their default.
insert_attribute(AId::FontStyle, "normal");
insert_attribute(AId::FontVariant, "normal");
insert_attribute(AId::FontWeight, "normal");
insert_attribute(AId::FontStretch, "normal");
insert_attribute(AId::LineHeight, "normal");
insert_attribute(AId::FontSizeAdjust, "none");
insert_attribute(AId::FontKerning, "auto");
insert_attribute(AId::FontVariantCaps, "normal");
insert_attribute(AId::FontVariantLigatures, "normal");
insert_attribute(AId::FontVariantNumeric, "normal");
insert_attribute(AId::FontVariantEastAsian, "normal");
insert_attribute(AId::FontVariantPosition, "normal");
insert_attribute(AId::FontStyle, "normal", declaration.important);
insert_attribute(AId::FontVariant, "normal", declaration.important);
insert_attribute(AId::FontWeight, "normal", declaration.important);
insert_attribute(AId::FontStretch, "normal", declaration.important);
insert_attribute(AId::LineHeight, "normal", declaration.important);
insert_attribute(AId::FontSizeAdjust, "none", declaration.important);
insert_attribute(AId::FontKerning, "auto", declaration.important);
insert_attribute(AId::FontVariantCaps, "normal", declaration.important);
insert_attribute(AId::FontVariantLigatures, "normal", declaration.important);
insert_attribute(AId::FontVariantNumeric, "normal", declaration.important);
insert_attribute(AId::FontVariantEastAsian, "normal", declaration.important);
insert_attribute(AId::FontVariantPosition, "normal", declaration.important);

// Then, we set the properties that have been declared.
shorthand
.font_stretch
.map(|s| insert_attribute(AId::FontStretch, s));
.map(|s| insert_attribute(AId::FontStretch, s, declaration.important));
shorthand
.font_weight
.map(|s| insert_attribute(AId::FontWeight, s));
.map(|s| insert_attribute(AId::FontWeight, s, declaration.important));
shorthand
.font_variant
.map(|s| insert_attribute(AId::FontVariant, s));
.map(|s| insert_attribute(AId::FontVariant, s, declaration.important));
shorthand
.font_style
.map(|s| insert_attribute(AId::FontStyle, s));
insert_attribute(AId::FontSize, shorthand.font_size);
insert_attribute(AId::FontFamily, shorthand.font_family);
.map(|s| insert_attribute(AId::FontStyle, s, declaration.important));
insert_attribute(AId::FontSize, shorthand.font_size, declaration.important);
insert_attribute(AId::FontFamily, shorthand.font_family, declaration.important);
} else {
log::warn!(
"Failed to parse {} value: '{}'",
Expand All @@ -328,7 +336,7 @@ pub(crate) fn parse_svg_element<'input>(
} else if let Some(aid) = AId::from_str(declaration.name) {
// Parse only the presentation attributes.
if aid.is_presentation() {
insert_attribute(aid, declaration.value);
insert_attribute(aid, declaration.value, declaration.important);
}
}
};
Expand Down Expand Up @@ -369,6 +377,7 @@ fn append_attribute<'input>(
tag_name: EId,
aid: AId,
value: roxmltree::StringStorage<'input>,
important: bool,
doc: &mut Document<'input>,
) -> bool {
match aid {
Expand All @@ -389,7 +398,7 @@ fn append_attribute<'input>(
return resolve_inherit(parent_id, aid, doc);
}

doc.append_attribute(aid, value);
doc.append_attribute(aid, value, important);
true
}

Expand All @@ -412,6 +421,7 @@ fn resolve_inherit(parent_id: NodeId, aid: AId, doc: &mut Document) -> bool {
doc.attrs.push(Attribute {
name: aid,
value: attr.value,
important: attr.important
});

return true;
Expand All @@ -429,6 +439,7 @@ fn resolve_inherit(parent_id: NodeId, aid: AId, doc: &mut Document) -> bool {
doc.attrs.push(Attribute {
name: aid,
value: attr.value,
important: attr.important
});

return true;
Expand Down Expand Up @@ -483,7 +494,7 @@ fn resolve_inherit(parent_id: NodeId, aid: AId, doc: &mut Document) -> bool {
_ => return false,
};

doc.append_attribute(aid, roxmltree::StringStorage::Borrowed(value));
doc.append_attribute(aid, roxmltree::StringStorage::Borrowed(value), false);
true
}

Expand Down
59 changes: 59 additions & 0 deletions crates/usvg/tests/parser.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -75,6 +75,65 @@ fn stylesheet_injection() {
);
}

#[test]
fn stylesheet_injection_with_important() {
let svg = "<svg id='svg1' viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'>
<style>
#rect4 {
fill: green
}
</style>
<rect id='rect1' x='20' y='20' width='60' height='60'/>
<rect id='rect2' x='120' y='20' width='60' height='60' fill='green'/>
<rect id='rect3' x='20' y='120' width='60' height='60' style='fill: green'/>
<rect id='rect4' x='120' y='120' width='60' height='60'/>
</svg>
";

let stylesheet = "rect { fill: red !important }".to_string();

let options = usvg::Options {
style_sheet: Some(stylesheet),
..usvg::Options::default()
};

let tree = usvg::Tree::from_str(&svg, &options).unwrap();

let usvg::Node::Path(ref first) = &tree.root().children()[0] else {
unreachable!()
};

// All rects should be overriden, since we use `important`.
assert_eq!(
first.fill().unwrap().paint(),
&usvg::Paint::Color(Color::new_rgb(255, 0, 0))
);

let usvg::Node::Path(ref second) = &tree.root().children()[1] else {
unreachable!()
};
assert_eq!(
second.fill().unwrap().paint(),
&usvg::Paint::Color(Color::new_rgb(255, 0, 0))
);

let usvg::Node::Path(ref third) = &tree.root().children()[2] else {
unreachable!()
};
assert_eq!(
third.fill().unwrap().paint(),
&usvg::Paint::Color(Color::new_rgb(255, 0, 0))
);

let usvg::Node::Path(ref third) = &tree.root().children()[3] else {
unreachable!()
};
assert_eq!(
third.fill().unwrap().paint(),
&usvg::Paint::Color(Color::new_rgb(255, 0, 0))
);
}

#[test]
fn simplify_paths() {
let svg = "
Expand Down
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