Struct style::stylist::Rule

pub struct Rule {
    pub selector: Selector<SelectorImpl>,
    pub hashes: AncestorHashes,
    pub source_order: u32,
    pub style_rule: Arc<Locked<StyleRule>>,
}

A rule, that wraps a style rule, but represents a single selector of the rule.

Fields

selector: Selector<SelectorImpl>

The selector this struct represents. We store this and the any_{important,normal} booleans inline in the Rule to avoid pointer-chasing when gathering applicable declarations, which can ruin performance when there are a lot of rules.

hashes: AncestorHashes

The ancestor hashes associated with the selector.

source_order: u32

The source order this style rule appears in. Note that we only use three bytes to store this value in ApplicableDeclarationsBlock, so we could repurpose that storage here if we needed to.

style_rule: Arc<Locked<StyleRule>>

The actual style rule.

Methods

impl Rule

pub fn specificity(&self) -> u32

Returns the specificity of the rule.

pub fn to_applicable_declaration_block(
    &self,
    level: CascadeLevel
) -> ApplicableDeclarationBlock

Turns this rule into an ApplicableDeclarationBlock for the given cascade level.

pub fn new(
    selector: Selector<SelectorImpl>,
    hashes: AncestorHashes,
    style_rule: Arc<Locked<StyleRule>>,
    source_order: u32
) -> Self

Creates a new Rule.

Trait Implementations

impl Clone for Rule

fn clone(&self) -> Rule

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Rule

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.

impl MallocSizeOf for Rule

fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize

Measure the heap usage of all descendant heap-allocated structures, but not the space taken up by the value itself.

impl SelectorMapEntry for Rule

Important traits for SelectorIter<'a, Impl>

impl<'a, Impl> Iterator for SelectorIter<'a, Impl> where
    Impl: SelectorImpl,  type Item = &'a Component<Impl>;

fn selector(&self) -> SelectorIter<SelectorImpl>

Gets the selector we should use to index in the selector map.