Struct AttrFunction 

pub struct AttrFunction {
    pub arg: SubstitutionArgument<AttrArgument>,
    pub fallback: Option<ArbitraryDeclarationValue>,
    namespaces: Option<FxHashMap<Prefix, Namespace>>,
}

Data specific to an attr() function.

Fields

arg: SubstitutionArgument<AttrArgument>

The referenced attribute name and optional type.

fallback: Option<ArbitraryDeclarationValue>

The fallback for this function, if any.

namespaces: Option<FxHashMap<Prefix, Namespace>>

The namespace prefixes in scope where the function was parsed.

Implementations

impl AttrFunction

pub fn parse( input: &mut Parser<'_>, context: &mut SubstitutionParserContext<'_>, ) -> Result<Self, ParseError>

Parses the attr() function arguments according to its argument grammar and syntax:

• = attr(, ?)
• attr() = attr( ? , ?)

pub fn replace<'a>( &'a self, source: &'a VariableValue, context: &mut SubstitutionReplacementContext<'a, '_, '_, '_>, ) -> Result<Substitution<'a>, ()>

Replaces the attr() function with its substitution value. https://drafts.csswg.org/css-values-5/#replace-an-attr-function

pub fn replace_arg<'a>( &'a self, source: &'a VariableValue, context: &mut SubstitutionReplacementContext<'a, '_, '_, '_>, ) -> ParsedArgument<'a, AttrArgument>

Returns the argument, substituting and parsing it first if it has references.

pub fn for_each_unparsed_value<F>(&self, f: F)

where F: FnMut(&ArbitraryDeclarationValue),

Calls f for each arbitrary declaration value nested in the function.

Trait Implementations

impl Clone for AttrFunction

fn clone(&self) -> AttrFunction

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for AttrFunction

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

Formats the value using the given formatter.

impl MallocSizeOf for AttrFunction

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 PartialEq for AttrFunction

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for AttrFunction

impl ToShmem for AttrFunction

fn to_shmem(&self, builder: &mut SharedMemoryBuilder) -> Result<Self>

Clones this value into a form suitable for writing into a SharedMemoryBuilder.