Enum BoxEdgesValue 

pub enum BoxEdgesValue {
    Edges(BoxEdges),
    Var {
        name: String,
        fallback: Option<Box<BoxEdgesValue>>,
    },
}

A BoxEdges value or a var(--name) reference, for padding/margin.

BoxEdges itself is Copy (4× u16) and cannot carry a heap String, so the var name lives in this wrapper enum. The cascade (crate::cascade) resolves Var against the token table; an unresolved Var degrades to zero edges (mirroring how an unresolved color Var degrades to Reset).

Variants

Edges(BoxEdges)

A concrete set of edges.

Var

A var(--name[, fallback]) reference, resolved during the cascade.

Fields

name: String

fallback: Option<Box<BoxEdgesValue>>

Implementations

impl BoxEdgesValue

pub fn parse(s: &str) -> Result<Self>

Parse a CSS shorthand that may be a var(--name) reference.

If s starts with var( (case-insensitive), the name and optional fallback are split on the first top-level comma (mirroring Length::parse / Color::parse_var); the fallback recurses via BoxEdgesValue::parse. Otherwise s is parsed as a concrete BoxEdges shorthand.

pub fn is_var(&self) -> bool

true if this is a var() reference that needs token resolution.

pub fn var(name: impl Into<String>) -> Self

Shortcut for var(--name) with no fallback.

Trait Implementations

impl Clone for BoxEdgesValue

fn clone(&self) -> BoxEdgesValue

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for BoxEdgesValue

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for BoxEdgesValue

fn deserialize<D: Deserializer<'de>>(d: D) -> Result<Self, D::Error>

Deserialize this value from the given Serde deserializer.

impl Display for BoxEdgesValue

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl From<BoxEdges> for BoxEdgesValue

fn from(e: BoxEdges) -> Self

Converts to this type from the input type.

impl IntoBoxEdges for BoxEdgesValue

fn into_edges(self) -> BoxEdgesValue

impl PartialEq for BoxEdgesValue

fn eq(&self, other: &BoxEdgesValue) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for BoxEdgesValue

fn serialize<S: Serializer>(&self, s: S) -> Result<S::Ok, S::Error>

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for BoxEdgesValue