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Passing these by value won't be ok of course, but that's fine. I plan to combine this with https://github.com/eqrion/cbindgen/pull/333 to actually be able to share representation for ~all the things, this is just the first bit. Box<T>, Atom and Arc<T> will be much easier since cbindgen can understand them without issues. It's boxed slices the only ones I should need something like this. I could avoid it if I rely on Rust's internal representation, which we can per [1], but then I need to teach cbindgen all about slices, which is generally hard, I think. [1]: https://github.com/rust-lang/unsafe-code-guidelines/blob/master/reference/src/layout/pointers.md Differential Revision: https://phabricator.services.mozilla.com/D29768
212 lines
6 KiB
Rust
212 lines
6 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 https://mozilla.org/MPL/2.0/. */
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//! Resolved values. These are almost always computed values, but in some cases
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//! there are used values.
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use crate::properties::ComputedValues;
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use cssparser;
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use smallvec::SmallVec;
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mod color;
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use crate::values::computed;
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/// Information needed to resolve a given value.
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pub struct Context<'a> {
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/// The style we're resolving for. This is useful to resolve currentColor.
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pub style: &'a ComputedValues,
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// TODO(emilio): Add layout box information, and maybe property-specific
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// information?
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}
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/// A trait to represent the conversion between resolved and resolved values.
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///
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/// This trait is derivable with `#[derive(ToResolvedValue)]`.
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///
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/// The deriving code assumes that if the type isn't generic, then the trait can
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/// be implemented as simple move. This means that a manual implementation with
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/// `ResolvedValue = Self` is bogus if it returns anything else than a clone.
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pub trait ToResolvedValue {
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/// The resolved value type we're going to be converted to.
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type ResolvedValue;
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/// Convert a resolved value to a resolved value.
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fn to_resolved_value(self, context: &Context) -> Self::ResolvedValue;
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/// Convert a resolved value to resolved value form.
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fn from_resolved_value(resolved: Self::ResolvedValue) -> Self;
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}
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macro_rules! trivial_to_resolved_value {
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($ty:ty) => {
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impl $crate::values::resolved::ToResolvedValue for $ty {
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type ResolvedValue = Self;
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#[inline]
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fn to_resolved_value(self, _: &Context) -> Self {
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self
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}
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#[inline]
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fn from_resolved_value(resolved: Self::ResolvedValue) -> Self {
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resolved
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}
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}
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};
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}
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trivial_to_resolved_value!(());
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trivial_to_resolved_value!(bool);
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trivial_to_resolved_value!(f32);
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trivial_to_resolved_value!(i32);
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trivial_to_resolved_value!(u8);
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trivial_to_resolved_value!(i8);
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trivial_to_resolved_value!(u16);
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trivial_to_resolved_value!(u32);
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trivial_to_resolved_value!(String);
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trivial_to_resolved_value!(Box<str>);
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trivial_to_resolved_value!(cssparser::RGBA);
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trivial_to_resolved_value!(crate::Atom);
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trivial_to_resolved_value!(app_units::Au);
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trivial_to_resolved_value!(computed::url::ComputedUrl);
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#[cfg(feature = "gecko")]
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trivial_to_resolved_value!(computed::url::ComputedImageUrl);
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#[cfg(feature = "servo")]
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trivial_to_resolved_value!(html5ever::Prefix);
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impl<A, B> ToResolvedValue for (A, B)
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where
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A: ToResolvedValue,
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B: ToResolvedValue,
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{
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type ResolvedValue = (
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<A as ToResolvedValue>::ResolvedValue,
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<B as ToResolvedValue>::ResolvedValue,
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);
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#[inline]
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fn to_resolved_value(self, context: &Context) -> Self::ResolvedValue {
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(
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self.0.to_resolved_value(context),
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self.1.to_resolved_value(context),
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)
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}
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#[inline]
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fn from_resolved_value(resolved: Self::ResolvedValue) -> Self {
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(
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A::from_resolved_value(resolved.0),
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B::from_resolved_value(resolved.1),
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)
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}
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}
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impl<T> ToResolvedValue for Option<T>
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where
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T: ToResolvedValue,
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{
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type ResolvedValue = Option<<T as ToResolvedValue>::ResolvedValue>;
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#[inline]
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fn to_resolved_value(self, context: &Context) -> Self::ResolvedValue {
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self.map(|item| item.to_resolved_value(context))
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}
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#[inline]
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fn from_resolved_value(resolved: Self::ResolvedValue) -> Self {
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resolved.map(T::from_resolved_value)
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}
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}
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impl<T> ToResolvedValue for SmallVec<[T; 1]>
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where
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T: ToResolvedValue,
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{
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type ResolvedValue = SmallVec<[<T as ToResolvedValue>::ResolvedValue; 1]>;
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#[inline]
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fn to_resolved_value(self, context: &Context) -> Self::ResolvedValue {
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self.into_iter()
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.map(|item| item.to_resolved_value(context))
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.collect()
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}
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#[inline]
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fn from_resolved_value(resolved: Self::ResolvedValue) -> Self {
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resolved.into_iter().map(T::from_resolved_value).collect()
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}
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}
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impl<T> ToResolvedValue for Vec<T>
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where
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T: ToResolvedValue,
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{
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type ResolvedValue = Vec<<T as ToResolvedValue>::ResolvedValue>;
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#[inline]
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fn to_resolved_value(self, context: &Context) -> Self::ResolvedValue {
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self.into_iter()
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.map(|item| item.to_resolved_value(context))
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.collect()
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}
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#[inline]
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fn from_resolved_value(resolved: Self::ResolvedValue) -> Self {
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resolved.into_iter().map(T::from_resolved_value).collect()
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}
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}
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impl<T> ToResolvedValue for Box<T>
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where
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T: ToResolvedValue,
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{
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type ResolvedValue = Box<<T as ToResolvedValue>::ResolvedValue>;
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#[inline]
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fn to_resolved_value(self, context: &Context) -> Self::ResolvedValue {
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Box::new(T::to_resolved_value(*self, context))
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}
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#[inline]
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fn from_resolved_value(resolved: Self::ResolvedValue) -> Self {
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Box::new(T::from_resolved_value(*resolved))
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}
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}
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impl<T> ToResolvedValue for Box<[T]>
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where
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T: ToResolvedValue,
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{
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type ResolvedValue = Box<[<T as ToResolvedValue>::ResolvedValue]>;
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#[inline]
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fn to_resolved_value(self, context: &Context) -> Self::ResolvedValue {
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Vec::from(self)
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.to_resolved_value(context)
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.into_boxed_slice()
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}
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#[inline]
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fn from_resolved_value(resolved: Self::ResolvedValue) -> Self {
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Vec::from_resolved_value(Vec::from(resolved)).into_boxed_slice()
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}
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}
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impl<T> ToResolvedValue for crate::OwnedSlice<T>
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where
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T: ToResolvedValue,
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{
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type ResolvedValue = crate::OwnedSlice<<T as ToResolvedValue>::ResolvedValue>;
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#[inline]
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fn to_resolved_value(self, context: &Context) -> Self::ResolvedValue {
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self.into_box().to_resolved_value(context).into()
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}
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#[inline]
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fn from_resolved_value(resolved: Self::ResolvedValue) -> Self {
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Self::from(Box::from_resolved_value(resolved.into_box()))
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}
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}
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