Trait Visitor

pub trait Visitor<'i, T: Visit<'i, T, Self> = DefaultAtRule> {
    type Error;

    // Required method
    fn visit_types(&self) -> VisitTypes;

    // Provided methods
    fn visit_stylesheet<'o>(
        &mut self,
        stylesheet: &mut StyleSheet<'i, 'o, T>,
    ) -> Result<(), Self::Error> { ... }
    fn visit_rule_list(
        &mut self,
        rules: &mut CssRuleList<'i, T>,
    ) -> Result<(), Self::Error> { ... }
    fn visit_rule(
        &mut self,
        rule: &mut CssRule<'i, T>,
    ) -> Result<(), Self::Error> { ... }
    fn visit_declaration_block(
        &mut self,
        decls: &mut DeclarationBlock<'i>,
    ) -> Result<(), Self::Error> { ... }
    fn visit_property(
        &mut self,
        property: &mut Property<'i>,
    ) -> Result<(), Self::Error> { ... }
    fn visit_url(&mut self, _url: &mut Url<'i>) -> Result<(), Self::Error> { ... }
    fn visit_color(&mut self, color: &mut CssColor) -> Result<(), Self::Error> { ... }
    fn visit_image(&mut self, image: &mut Image<'i>) -> Result<(), Self::Error> { ... }
    fn visit_length(
        &mut self,
        length: &mut LengthValue,
    ) -> Result<(), Self::Error> { ... }
    fn visit_angle(&mut self, angle: &mut Angle) -> Result<(), Self::Error> { ... }
    fn visit_ratio(&mut self, ratio: &mut Ratio) -> Result<(), Self::Error> { ... }
    fn visit_resolution(
        &mut self,
        resolution: &mut Resolution,
    ) -> Result<(), Self::Error> { ... }
    fn visit_time(&mut self, time: &mut Time) -> Result<(), Self::Error> { ... }
    fn visit_custom_ident(
        &mut self,
        ident: &mut CustomIdent<'_>,
    ) -> Result<(), Self::Error> { ... }
    fn visit_dashed_ident(
        &mut self,
        ident: &mut DashedIdent<'_>,
    ) -> Result<(), Self::Error> { ... }
    fn visit_variable(
        &mut self,
        var: &mut Variable<'i>,
    ) -> Result<(), Self::Error> { ... }
    fn visit_environment_variable(
        &mut self,
        env: &mut EnvironmentVariable<'i>,
    ) -> Result<(), Self::Error> { ... }
    fn visit_media_list(
        &mut self,
        media: &mut MediaList<'i>,
    ) -> Result<(), Self::Error> { ... }
    fn visit_media_query(
        &mut self,
        query: &mut MediaQuery<'i>,
    ) -> Result<(), Self::Error> { ... }
    fn visit_media_feature(
        &mut self,
        feature: &mut MediaFeature<'i>,
    ) -> Result<(), Self::Error> { ... }
    fn visit_media_feature_value(
        &mut self,
        value: &mut MediaFeatureValue<'i>,
    ) -> Result<(), Self::Error> { ... }
    fn visit_supports_condition(
        &mut self,
        condition: &mut SupportsCondition<'i>,
    ) -> Result<(), Self::Error> { ... }
    fn visit_selector_list(
        &mut self,
        selectors: &mut SelectorList<'i>,
    ) -> Result<(), Self::Error> { ... }
    fn visit_selector(
        &mut self,
        selector: &mut Selector<'i>,
    ) -> Result<(), Self::Error> { ... }
    fn visit_function(
        &mut self,
        function: &mut Function<'i>,
    ) -> Result<(), Self::Error> { ... }
    fn visit_token_list(
        &mut self,
        tokens: &mut TokenList<'i>,
    ) -> Result<(), Self::Error> { ... }
    fn visit_token(
        &mut self,
        token: &mut TokenOrValue<'i>,
    ) -> Result<(), Self::Error> { ... }
}

Available on crate feature visitor only.

A trait for visiting or transforming rules, properties, and values in a StyleSheet.

Required Associated Types

type Error

The Err value for Results returned by visit_* methods.

Required Methods

fn visit_types(&self) -> VisitTypes

Returns the types of values that this visitor should visit. By default, it returns Self::TYPES, but this can be overridden to change the value at runtime.

Provided Methods

fn visit_stylesheet<'o>( &mut self, stylesheet: &mut StyleSheet<'i, 'o, T>, ) -> Result<(), Self::Error>

Visits a stylesheet.

fn visit_rule_list( &mut self, rules: &mut CssRuleList<'i, T>, ) -> Result<(), Self::Error>

Visits a rule list.

fn visit_rule(&mut self, rule: &mut CssRule<'i, T>) -> Result<(), Self::Error>

Visits a rule.

fn visit_declaration_block( &mut self, decls: &mut DeclarationBlock<'i>, ) -> Result<(), Self::Error>

Visits a declaration block.

fn visit_property( &mut self, property: &mut Property<'i>, ) -> Result<(), Self::Error>

Visits a property.

fn visit_url(&mut self, _url: &mut Url<'i>) -> Result<(), Self::Error>

Visits a url.

fn visit_color(&mut self, color: &mut CssColor) -> Result<(), Self::Error>

Visits a color.

fn visit_image(&mut self, image: &mut Image<'i>) -> Result<(), Self::Error>

Visits an image.

fn visit_length(&mut self, length: &mut LengthValue) -> Result<(), Self::Error>

Visits a length.

fn visit_angle(&mut self, angle: &mut Angle) -> Result<(), Self::Error>

Visits an angle.

fn visit_ratio(&mut self, ratio: &mut Ratio) -> Result<(), Self::Error>

Visits a ratio.

fn visit_resolution( &mut self, resolution: &mut Resolution, ) -> Result<(), Self::Error>

Visits a resolution.

fn visit_time(&mut self, time: &mut Time) -> Result<(), Self::Error>

Visits a time.

fn visit_custom_ident( &mut self, ident: &mut CustomIdent<'_>, ) -> Result<(), Self::Error>

Visits a custom ident.

fn visit_dashed_ident( &mut self, ident: &mut DashedIdent<'_>, ) -> Result<(), Self::Error>

Visits a dashed ident.

fn visit_variable(&mut self, var: &mut Variable<'i>) -> Result<(), Self::Error>

Visits a variable reference.

fn visit_environment_variable( &mut self, env: &mut EnvironmentVariable<'i>, ) -> Result<(), Self::Error>

Visits an environment variable reference.

fn visit_media_list( &mut self, media: &mut MediaList<'i>, ) -> Result<(), Self::Error>

Visits a media query list.

fn visit_media_query( &mut self, query: &mut MediaQuery<'i>, ) -> Result<(), Self::Error>

Visits a media query.

fn visit_media_feature( &mut self, feature: &mut MediaFeature<'i>, ) -> Result<(), Self::Error>

Visits a media feature.

fn visit_media_feature_value( &mut self, value: &mut MediaFeatureValue<'i>, ) -> Result<(), Self::Error>

Visits a media feature value.

fn visit_supports_condition( &mut self, condition: &mut SupportsCondition<'i>, ) -> Result<(), Self::Error>

Visits a supports condition.

fn visit_selector_list( &mut self, selectors: &mut SelectorList<'i>, ) -> Result<(), Self::Error>

Visits a selector list.

fn visit_selector( &mut self, selector: &mut Selector<'i>, ) -> Result<(), Self::Error>

Visits a selector.

fn visit_function( &mut self, function: &mut Function<'i>, ) -> Result<(), Self::Error>

Visits a custom function.

fn visit_token_list( &mut self, tokens: &mut TokenList<'i>, ) -> Result<(), Self::Error>

Visits a token list.

fn visit_token( &mut self, token: &mut TokenOrValue<'i>, ) -> Result<(), Self::Error>

Visits a token or value in an unparsed property.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors