Struct style::queries::feature_expression::QueryFeatureExpression

pub struct QueryFeatureExpression {
    feature_type: FeatureType,
    feature_index: usize,
    kind: QueryFeatureExpressionKind,
}

A feature expression contains a reference to the feature, the value the query contained, and the range to evaluate.

Fields

feature_type: FeatureType

feature_index: usize

kind: QueryFeatureExpressionKind

Implementations

impl QueryFeatureExpression

fn new( feature_type: FeatureType, feature_index: usize, kind: QueryFeatureExpressionKind, ) -> Self

fn write_name<W>(&self, dest: &mut CssWriter<'_, W>) -> Result

where W: Write,

fn feature(&self) -> &'static QueryFeatureDescription

pub fn feature_flags(&self) -> FeatureFlags

Returns the feature flags for our feature.

pub fn parse<'i, 't>( context: &ParserContext<'_>, input: &mut Parser<'i, 't>, feature_type: FeatureType, ) -> Result<Self, ParseError<'i>>

Parse a feature expression of the form:

(media-feature: media-value)

fn parse_feature_name<'i, 't>( context: &ParserContext<'_>, input: &mut Parser<'i, 't>, feature_type: FeatureType, ) -> Result<(usize, Option<LegacyRange>), ParseError<'i>>

fn parse_multi_range_syntax<'i, 't>( context: &ParserContext<'_>, input: &mut Parser<'i, 't>, feature_type: FeatureType, ) -> Result<Self, ParseError<'i>>

Parses the following range syntax:

(feature-value feature-name) (feature-value feature-name feature-value)

pub fn parse_in_parenthesis_block<'i, 't>( context: &ParserContext<'_>, input: &mut Parser<'i, 't>, feature_type: FeatureType, ) -> Result<Self, ParseError<'i>>

Parse a feature expression where we’ve already consumed the parenthesis.

pub fn matches(&self, context: &Context<'_>) -> KleeneValue

Returns whether this query evaluates to true for the given device.

Trait Implementations

impl Clone for QueryFeatureExpression

fn clone(&self) -> QueryFeatureExpression

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for QueryFeatureExpression

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

Formats the value using the given formatter.

impl MallocSizeOf for QueryFeatureExpression

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 QueryFeatureExpression

fn eq(&self, other: &QueryFeatureExpression) -> 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 ToCss for QueryFeatureExpression

fn to_css<W>(&self, dest: &mut CssWriter<'_, W>) -> Result

where W: Write,

Serialize self in CSS syntax, writing to dest.

fn to_css_string(&self) -> String

Serialize self in CSS syntax and return a string.

impl ToShmem for QueryFeatureExpression

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

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

impl StructuralPartialEq for QueryFeatureExpression