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42 lines
1.4 KiB
Rust
42 lines
1.4 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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//! Visitor traits for selectors.
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#![deny(missing_docs)]
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use parser::{AttrSelector, Combinator, Component};
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use parser::{SelectorImpl, SelectorIter};
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/// A trait to visit selector properties.
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///
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/// All the `visit_foo` methods return a boolean indicating whether the
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/// traversal should continue or not.
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pub trait SelectorVisitor {
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/// The selector implementation this visitor wants to visit.
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type Impl: SelectorImpl;
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/// Visit an attribute selector that may match (there are other selectors
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/// that may never match, like those containing whitespace or the empty
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/// string).
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fn visit_attribute_selector(&mut self, _: &AttrSelector<Self::Impl>) -> bool {
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true
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}
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/// Visit a simple selector.
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fn visit_simple_selector(&mut self, _: &Component<Self::Impl>) -> bool {
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true
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}
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/// Visits a complex selector.
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///
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/// Gets the combinator to the right of the selector, or `None` if the
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/// selector is the leftmost one.
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fn visit_complex_selector(&mut self,
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_: SelectorIter<Self::Impl>,
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_combinator_to_right: Option<Combinator>)
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-> bool {
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true
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}
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}
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