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Move MatchingContext to a new module
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| /* This Source Code Form is subject to the terms of the Mozilla Public | ||
| * License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | ||
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| use attr::CaseSensitivity; | ||
| use bloom::BloomFilter; | ||
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| bitflags! { | ||
| /// Set of flags that determine the different kind of elements affected by | ||
| /// the selector matching process. | ||
| /// | ||
| /// This is used to implement efficient sharing. | ||
| #[derive(Default)] | ||
| pub flags StyleRelations: usize { | ||
| /// Whether this element is affected by presentational hints. This is | ||
| /// computed externally (that is, in Servo). | ||
| const AFFECTED_BY_PRESENTATIONAL_HINTS = 1 << 0, | ||
| /// Whether this element has pseudo-element styles. Computed externally. | ||
| const AFFECTED_BY_PSEUDO_ELEMENTS = 1 << 1, | ||
| } | ||
| } | ||
|
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| /// What kind of selector matching mode we should use. | ||
| /// | ||
| /// There are two modes of selector matching. The difference is only noticeable | ||
| /// in presence of pseudo-elements. | ||
| #[derive(Debug, PartialEq, Copy, Clone)] | ||
| pub enum MatchingMode { | ||
| /// Don't ignore any pseudo-element selectors. | ||
| Normal, | ||
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| /// Ignores any stateless pseudo-element selectors in the rightmost sequence | ||
| /// of simple selectors. | ||
| /// | ||
| /// This is useful, for example, to match against ::before when you aren't a | ||
| /// pseudo-element yourself. | ||
| /// | ||
| /// For example, in presence of `::before:hover`, it would never match, but | ||
| /// `::before` would be ignored as in "matching". | ||
| /// | ||
| /// It's required for all the selectors you match using this mode to have a | ||
| /// pseudo-element. | ||
| ForStatelessPseudoElement, | ||
| } | ||
|
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| /// The mode to use when matching unvisited and visited links. | ||
| #[derive(PartialEq, Eq, Copy, Clone, Debug)] | ||
| pub enum VisitedHandlingMode { | ||
| /// All links are matched as if they are unvisted. | ||
| AllLinksUnvisited, | ||
| /// A element's "relevant link" is the element being matched if it is a link | ||
| /// or the nearest ancestor link. The relevant link is matched as though it | ||
| /// is visited, and all other links are matched as if they are unvisited. | ||
| RelevantLinkVisited, | ||
| } | ||
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| /// Which quirks mode is this document in. | ||
| /// | ||
| /// See: https://quirks.spec.whatwg.org/ | ||
| #[derive(PartialEq, Eq, Copy, Clone, Hash, Debug)] | ||
| pub enum QuirksMode { | ||
| /// Quirks mode. | ||
| Quirks, | ||
| /// Limited quirks mode. | ||
| LimitedQuirks, | ||
| /// No quirks mode. | ||
| NoQuirks, | ||
| } | ||
|
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| impl QuirksMode { | ||
| #[inline] | ||
| pub fn classes_and_ids_case_sensitivity(self) -> CaseSensitivity { | ||
| match self { | ||
| QuirksMode::NoQuirks | | ||
| QuirksMode::LimitedQuirks => CaseSensitivity::CaseSensitive, | ||
| QuirksMode::Quirks => CaseSensitivity::AsciiCaseInsensitive, | ||
| } | ||
| } | ||
| } | ||
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| /// Data associated with the matching process for a element. This context is | ||
| /// used across many selectors for an element, so it's not appropriate for | ||
| /// transient data that applies to only a single selector. | ||
| #[derive(Clone)] | ||
| pub struct MatchingContext<'a> { | ||
| /// Output that records certains relations between elements noticed during | ||
| /// matching (and also extended after matching). | ||
| pub relations: StyleRelations, | ||
| /// Input with the matching mode we should use when matching selectors. | ||
| pub matching_mode: MatchingMode, | ||
| /// Input with the bloom filter used to fast-reject selectors. | ||
| pub bloom_filter: Option<&'a BloomFilter>, | ||
| /// Input that controls how matching for links is handled. | ||
| pub visited_handling: VisitedHandlingMode, | ||
| /// Output that records whether we encountered a "relevant link" while | ||
| /// matching _any_ selector for this element. (This differs from | ||
| /// `RelevantLinkStatus` which tracks the status for the _current_ selector | ||
| /// only.) | ||
| pub relevant_link_found: bool, | ||
| /// The quirks mode of the document. | ||
| pub quirks_mode: QuirksMode, | ||
| } | ||
|
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| impl<'a> MatchingContext<'a> { | ||
| /// Constructs a new `MatchingContext`. | ||
| pub fn new(matching_mode: MatchingMode, | ||
| bloom_filter: Option<&'a BloomFilter>, | ||
| quirks_mode: QuirksMode) | ||
| -> Self | ||
| { | ||
| Self { | ||
| relations: StyleRelations::empty(), | ||
| matching_mode: matching_mode, | ||
| bloom_filter: bloom_filter, | ||
| visited_handling: VisitedHandlingMode::AllLinksUnvisited, | ||
| relevant_link_found: false, | ||
| quirks_mode: quirks_mode, | ||
| } | ||
| } | ||
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| /// Constructs a new `MatchingContext` for use in visited matching. | ||
| pub fn new_for_visited(matching_mode: MatchingMode, | ||
| bloom_filter: Option<&'a BloomFilter>, | ||
| visited_handling: VisitedHandlingMode, | ||
| quirks_mode: QuirksMode) | ||
| -> Self | ||
| { | ||
| Self { | ||
| relations: StyleRelations::empty(), | ||
| matching_mode: matching_mode, | ||
| bloom_filter: bloom_filter, | ||
| visited_handling: visited_handling, | ||
| relevant_link_found: false, | ||
| quirks_mode: quirks_mode, | ||
| } | ||
| } | ||
| } |
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