Enum style::queries::condition::QueryCondition

pub enum QueryCondition {
    Feature(QueryFeatureExpression),
    Not(Box<QueryCondition>),
    Operation(Box<[QueryCondition]>, Operator),
    InParens(Box<QueryCondition>),
    GeneralEnclosed(String),
}

Represents a condition.

Variants

Feature(QueryFeatureExpression)

A simple feature expression, implicitly parenthesized.

Not(Box<QueryCondition>)

A negation of a condition.

Operation(Box<[QueryCondition]>, Operator)

A set of joint operations.

InParens(Box<QueryCondition>)

A condition wrapped in parenthesis.

GeneralEnclosed(String)

[ ? ) ] | [ ( ? ) ]

Implementations

impl QueryCondition

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

Parse a single condition.

fn visit<F>(&self, visitor: &mut F)

where F: FnMut(&Self),

pub fn cumulative_flags(&self) -> FeatureFlags

Returns the union of all flags in the expression. This is useful for container queries.

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

Parse a single condition, disallowing or expressions.

To be used from the legacy query syntax.

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

https://drafts.csswg.org/mediaqueries-5/#typedef-media-condition or https://drafts.csswg.org/mediaqueries-5/#typedef-media-condition-without-or (depending on allow_or).

fn parse_in_parenthesis_block<'i>( context: &ParserContext<'_>, input: &mut Parser<'i, '_>, feature_type: FeatureType, ) -> Result<Self, ParseError<'i>>

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

Parse a condition in parentheses, or <general-enclosed>.

https://drafts.csswg.org/mediaqueries/#typedef-media-in-parens

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

Whether this condition matches the device and quirks mode. https://drafts.csswg.org/mediaqueries/#evaluating https://drafts.csswg.org/mediaqueries/#typedef-general-enclosed Kleene 3-valued logic is adopted here due to the introduction of .

Trait Implementations

impl Clone for QueryCondition

fn clone(&self) -> QueryCondition

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for QueryCondition

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

Formats the value using the given formatter.

impl MallocSizeOf for QueryCondition

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 QueryCondition

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

This method tests for self and other values to be equal, and is used by ==.

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

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

impl ToCss for QueryCondition

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 QueryCondition

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

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

impl StructuralPartialEq for QueryCondition