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Move deduplicate_property_declarations to PropertyDeclaration::deduplicate

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This commit is contained in:
Simon Sapin 2017-02-23 17:48:51 +01:00
parent 066c5a01b2
commit 0b4877590f
2 changed files with 34 additions and 37 deletions
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35
components/style/properties/declaration_block.rs
View file

@ -274,6 +274,39 @@ impl PropertyDeclarationBlock {
}
}
}
/// Only keep the "winning" declaration for any given property, by importance then source order.
pub fn deduplicate(&mut self) {
let mut deduplicated = Vec::with_capacity(self.declarations.len());
let mut seen_normal = PropertyDeclarationIdSet::new();
let mut seen_important = PropertyDeclarationIdSet::new();
for (declaration, importance) in self.declarations.drain(..).rev() {
if importance.important() {
let id = declaration.id();
if seen_important.contains(id) {
self.important_count -= 1;
continue
}
if seen_normal.contains(id) {
let previous_len = deduplicated.len();
deduplicated.retain(|&(ref d, _)| PropertyDeclaration::id(d) != id);
debug_assert_eq!(deduplicated.len(), previous_len - 1);
}
seen_important.insert(id);
} else {
let id = declaration.id();
if seen_normal.contains(id) ||
seen_important.contains(id) {
continue
}
seen_normal.insert(id)
}
deduplicated.push((declaration, importance))
}
deduplicated.reverse();
self.declarations = deduplicated;
}
}
impl ToCss for PropertyDeclarationBlock {
@ -612,6 +645,6 @@ pub fn parse_property_declaration_list(context: &ParserContext,
declarations: iter.parser.declarations,
important_count: important_count,
};
super::deduplicate_property_declarations(&mut block);
block.deduplicate();
block
}

36
components/style/properties/properties.mako.rs
View file

@ -407,42 +407,6 @@ impl PropertyDeclarationIdSet {
% endif
% endfor
/// Given a property declaration block, only keep the "winning" declaration for
/// any given property, by importance then source order.
///
/// The input and output are in source order
fn deduplicate_property_declarations(block: &mut PropertyDeclarationBlock) {
let mut deduplicated = Vec::with_capacity(block.declarations.len());
let mut seen_normal = PropertyDeclarationIdSet::new();
let mut seen_important = PropertyDeclarationIdSet::new();
for (declaration, importance) in block.declarations.drain(..).rev() {
if importance.important() {
let id = declaration.id();
if seen_important.contains(id) {
block.important_count -= 1;
continue
}
if seen_normal.contains(id) {
let previous_len = deduplicated.len();
deduplicated.retain(|&(ref d, _)| PropertyDeclaration::id(d) != id);
debug_assert_eq!(deduplicated.len(), previous_len - 1);
}
seen_important.insert(id);
} else {
let id = declaration.id();
if seen_normal.contains(id) ||
seen_important.contains(id) {
continue
}
seen_normal.insert(id)
}
deduplicated.push((declaration, importance))
}
deduplicated.reverse();
block.declarations = deduplicated;
}
/// An enum to represent a CSS Wide keyword.
#[derive(Copy, Clone, PartialEq, Eq, Debug)]
pub enum CSSWideKeyword {