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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 https://mozilla.org/MPL/2.0/. */
//! Registered custom properties.
use super::rule::{Inherits, InitialValue, PropertyRuleName};
use super::syntax::Descriptor;
use crate::selector_map::PrecomputedHashMap;
use crate::stylesheets::UrlExtraData;
use crate::Atom;
use cssparser::SourceLocation;
/// The metadata of a custom property registration that we need to do the cascade properly.
#[derive(Debug, Clone, MallocSizeOf)]
pub struct PropertyRegistrationData {
/// The syntax of the property.
pub syntax: Descriptor,
/// Whether the property inherits.
pub inherits: Inherits,
/// The initial value. Only missing for universal syntax.
#[ignore_malloc_size_of = "Arc"]
pub initial_value: Option<InitialValue>,
}
static UNREGISTERED: PropertyRegistrationData = PropertyRegistrationData {
syntax: Descriptor::universal(),
inherits: Inherits::True,
initial_value: None,
};
impl PropertyRegistrationData {
/// The data for an unregistered property.
pub fn unregistered() -> &'static Self {
&UNREGISTERED
}
/// Returns whether this property inherits.
#[inline]
pub fn inherits(&self) -> bool {
self.inherits == Inherits::True
}
}
/// A computed, already-validated property registration.
/// <https://drafts.css-houdini.org/css-properties-values-api-1/#custom-property-registration>
#[derive(Debug, Clone, MallocSizeOf)]
pub struct PropertyRegistration {
/// The custom property name.
pub name: PropertyRuleName,
/// The actual information about the property.
pub data: PropertyRegistrationData,
/// The url data that is used to parse and compute the registration's initial value. Note that
/// it's not the url data that should be used to parse other values. Other values should use
/// the data of the style sheet where they came from.
pub url_data: UrlExtraData,
/// The source location of this registration, if it comes from a CSS rule.
pub source_location: SourceLocation,
}
impl PropertyRegistration {
/// Returns whether this property inherits.
#[inline]
pub fn inherits(&self) -> bool {
self.data.inherits == Inherits::True
}
}
/// The script registry of custom properties.
/// <https://drafts.css-houdini.org/css-properties-values-api-1/#dom-window-registeredpropertyset-slot>
#[derive(Default)]
pub struct ScriptRegistry {
properties: PrecomputedHashMap<Atom, PropertyRegistration>,
}
impl ScriptRegistry {
/// Gets an already-registered custom property via script.
#[inline]
pub fn get(&self, name: &Atom) -> Option<&PropertyRegistration> {
self.properties.get(name)
}
/// Gets already-registered custom properties via script.
#[inline]
pub fn properties(&self) -> &PrecomputedHashMap<Atom, PropertyRegistration> {
&self.properties
}
/// Register a given property. As per
/// <https://drafts.css-houdini.org/css-properties-values-api-1/#the-registerproperty-function>
/// we don't allow overriding the registration.
#[inline]
pub fn register(&mut self, registration: PropertyRegistration) {
let name = registration.name.0.clone();
let old = self.properties.insert(name, registration);
debug_assert!(old.is_none(), "Already registered? Should be an error");
}
/// Returns the properties hashmap.
#[inline]
pub fn get_all(&self) -> &PrecomputedHashMap<Atom, PropertyRegistration> {
&self.properties
}
}
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