Trait QueryCondition

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pub trait QueryCondition: Sized + ToCss {
    type Feature;

Show 15 methods    // Required methods
    fn parse_feature(input: &mut Parser<'_>) -> Result<Self>;
    fn parse_style_query(input: &mut Parser<'_>) -> Result<Self>;
    fn needs_parens(
        &self,
        parent_operator: Option<Operator>,
        targets: &Targets,
    ) -> bool;
    fn as_feature(&self) -> Option<&Self::Feature>;
    fn as_not(&self) -> Option<&Self>;
    fn as_operation(&self) -> Option<(Operator, &[Self])>;
    fn feature_to_css(
        f: &Self::Feature,
        dest: &mut Printer<'_>,
    ) -> Result<(), PrintErr>;

    // Provided methods
    fn parse_feature_with_options(
        input: &mut Parser<'_>,
        _options: &ParserOptions<'_>,
    ) -> Result<Self> { ... }
    fn create_negation(condition: Box<Self>) -> Self { ... }
    fn create_negation_in(condition: Self, _alloc: ArenaPtr) -> Self { ... }
    fn create_operation(operator: Operator, conditions: Vec<Self>) -> Self { ... }
    fn create_operation_in(
        operator: Operator,
        conditions: ArenaVec<Self>,
    ) -> Self { ... }
    fn parse_style_query_with_options(
        input: &mut Parser<'_>,
        _options: &ParserOptions<'_>,
    ) -> Result<Self> { ... }
    fn extra_to_css(&self, _dest: &mut Printer<'_>) -> Result<(), PrintErr> { ... }
    fn condition_to_css(&self, dest: &mut Printer<'_>) -> Result<(), PrintErr> { ... }
}

Expand description

Trait modeling Zig’s ValidQueryCondition comptime interface check. Any type that can appear as a node in a query-condition tree.

Required Associated Types§

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type Feature

Leaf payload: QueryFeature<_> for media/container, Property for StyleQuery.

Required Methods§

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fn parse_feature(input: &mut Parser<'_>) -> Result<Self>

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fn parse_style_query(input: &mut Parser<'_>) -> Result<Self>

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fn needs_parens( &self, parent_operator: Option<Operator>, targets: &Targets, ) -> bool

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fn feature_to_css( f: &Self::Feature, dest: &mut Printer<'_>, ) -> Result<(), PrintErr>

Serialize the leaf feature. Not defaulted: Property::to_css takes an extra is_custom_property flag, and QueryFeature::to_css is inherent (not the ToCss trait), so callers must spell the dispatch.

Provided Methods§

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fn parse_feature_with_options( input: &mut Parser<'_>, _options: &ParserOptions<'_>, ) -> Result<Self>

parse_feature with ParserOptions threaded — needed for the env() arm of MediaFeatureValue::parse_unknown. Default impl drops options so out-of-tree implementors (e.g. rules::container::{ContainerCondition,StyleQuery}) keep compiling until they opt in.

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fn create_negation(condition: Box<Self>) -> Self

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fn create_negation_in(condition: Self, _alloc: ArenaPtr) -> Self

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fn create_operation(operator: Operator, conditions: Vec<Self>) -> Self

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fn create_operation_in(operator: Operator, conditions: ArenaVec<Self>) -> Self

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fn parse_style_query_with_options( input: &mut Parser<'_>, _options: &ParserOptions<'_>, ) -> Result<Self>

See parse_feature_with_options — same default-forward rationale.

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fn extra_to_css(&self, _dest: &mut Printer<'_>) -> Result<(), PrintErr>

Serialize a variant that isn’t Feature/Not/Operation (e.g. ContainerCondition::Style). Implementors with no extra variants leave the default.

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fn condition_to_css(&self, dest: &mut Printer<'_>) -> Result<(), PrintErr>

Provided: shared ToCss body for the Feature/Not/Operation lattice (+ extra_to_css fallback). Mirrors the three hand-rolled matches this replaced.