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Implement #[distance(fallback)] for #[derive(ComputeSquaredDistance)]

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This commit is contained in:
Anthony Ramine 2017-08-26 18:13:40 +02:00
parent 4faadb489f
commit 41c3be54ea
3 changed files with 49 additions and 51 deletions
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77
components/style/values/computed/length.rs
View file

@ -278,7 +278,9 @@ impl ToComputedValue for specified::CalcLengthOrPercentage {
#[animate(fallback = "Self::animate_fallback")]
#[cfg_attr(feature = "servo", derive(HeapSizeOf))]
#[css(derive_debug)]
#[derive(Animate, Clone, Copy, PartialEq, ToAnimatedZero, ToCss)]
#[derive(Animate, Clone, ComputeSquaredDistance, Copy, PartialEq)]
#[derive(ToAnimatedZero, ToCss)]
#[distance(fallback = "Self::compute_squared_distance_fallback")]
pub enum LengthOrPercentage {
Length(Au),
Percentage(Percentage),
@ -304,22 +306,16 @@ impl LengthOrPercentage {
let other = CalcLengthOrPercentage::from(*other);
Ok(LengthOrPercentage::Calc(this.animate(&other, procedure)?))
}
}
impl ComputeSquaredDistance for LengthOrPercentage {
#[inline]
fn compute_squared_distance(&self, other: &Self) -> Result<SquaredDistance, ()> {
match (self, other) {
(&LengthOrPercentage::Length(ref this), &LengthOrPercentage::Length(ref other)) => {
this.compute_squared_distance(other)
},
(&LengthOrPercentage::Percentage(ref this), &LengthOrPercentage::Percentage(ref other)) => {
this.compute_squared_distance(other)
},
(this, other) => {
CalcLengthOrPercentage::compute_squared_distance(&(*this).into(), &(*other).into())
}
}
fn compute_squared_distance_fallback(
&self,
other: &Self,
) -> Result<SquaredDistance, ()> {
CalcLengthOrPercentage::compute_squared_distance(
&(*self).into(),
&(*other).into(),
)
}
}
@ -432,7 +428,8 @@ impl ToComputedValue for specified::LengthOrPercentage {
#[animate(fallback = "Self::animate_fallback")]
#[cfg_attr(feature = "servo", derive(HeapSizeOf))]
#[css(derive_debug)]
#[derive(Animate, Clone, Copy, PartialEq, ToCss)]
#[derive(Animate, Clone, ComputeSquaredDistance, Copy, PartialEq, ToCss)]
#[distance(fallback = "Self::compute_squared_distance_fallback")]
pub enum LengthOrPercentageOrAuto {
Length(Au),
Percentage(Percentage),
@ -453,22 +450,16 @@ impl LengthOrPercentageOrAuto {
this.animate(&other, procedure)?.ok_or(())?,
))
}
}
impl ComputeSquaredDistance for LengthOrPercentageOrAuto {
#[inline]
fn compute_squared_distance(&self, other: &Self) -> Result<SquaredDistance, ()> {
match (self, other) {
(&LengthOrPercentageOrAuto::Length(ref this), &LengthOrPercentageOrAuto::Length(ref other)) => {
this.compute_squared_distance(other)
},
(&LengthOrPercentageOrAuto::Percentage(ref this), &LengthOrPercentageOrAuto::Percentage(ref other)) => {
this.compute_squared_distance(other)
},
(this, other) => {
<Option<CalcLengthOrPercentage>>::compute_squared_distance(&(*this).into(), &(*other).into())
}
}
fn compute_squared_distance_fallback(
&self,
other: &Self,
) -> Result<SquaredDistance, ()> {
<Option<CalcLengthOrPercentage>>::compute_squared_distance(
&(*self).into(),
&(*other).into(),
)
}
}
@ -533,7 +524,8 @@ impl ToComputedValue for specified::LengthOrPercentageOrAuto {
#[animate(fallback = "Self::animate_fallback")]
#[cfg_attr(feature = "servo", derive(HeapSizeOf))]
#[css(derive_debug)]
#[derive(Animate, Clone, Copy, PartialEq, ToCss)]
#[derive(Animate, Clone, ComputeSquaredDistance, Copy, PartialEq, ToCss)]
#[distance(fallback = "Self::compute_squared_distance_fallback")]
pub enum LengthOrPercentageOrNone {
Length(Au),
Percentage(Percentage),
@ -554,22 +546,15 @@ impl LengthOrPercentageOrNone {
this.animate(&other, procedure)?.ok_or(())?,
))
}
}
impl ComputeSquaredDistance for LengthOrPercentageOrNone {
#[inline]
fn compute_squared_distance(&self, other: &Self) -> Result<SquaredDistance, ()> {
match (self, other) {
(&LengthOrPercentageOrNone::Length(ref this), &LengthOrPercentageOrNone::Length(ref other)) => {
this.compute_squared_distance(other)
},
(&LengthOrPercentageOrNone::Percentage(ref this), &LengthOrPercentageOrNone::Percentage(ref other)) => {
this.compute_squared_distance(other)
},
(this, other) => {
<Option<CalcLengthOrPercentage>>::compute_squared_distance(&(*this).into(), &(*other).into())
}
}
fn compute_squared_distance_fallback(
&self,
other: &Self,
) -> Result<SquaredDistance, ()> {
<Option<CalcLengthOrPercentage>>::compute_squared_distance(
&(*self).into(),
&(*other).into(),
)
}
}

21
components/style_derive/compute_squared_distance.rs
View file

@ -4,15 +4,16 @@
use animate::AnimationVariantAttrs;
use cg;
use quote;
use syn;
use quote::Tokens;
use syn::{DeriveInput, Path};
pub fn derive(input: syn::DeriveInput) -> quote::Tokens {
pub fn derive(input: DeriveInput) -> Tokens {
let name = &input.ident;
let trait_path = &["values", "distance", "ComputeSquaredDistance"];
let (impl_generics, ty_generics, mut where_clause) =
cg::trait_parts(&input, trait_path);
let input_attrs = cg::parse_input_attrs::<DistanceInputAttrs>(&input);
let variants = cg::variants(&input);
let mut match_body = quote!();
let mut append_error_clause = variants.len() > 1;
@ -45,7 +46,13 @@ pub fn derive(input: syn::DeriveInput) -> quote::Tokens {
}));
if append_error_clause {
match_body = quote! { #match_body, _ => Err(()), };
if let Some(fallback) = input_attrs.fallback {
match_body.append(quote! {
(this, other) => #fallback(this, other)
});
} else {
match_body.append(quote! { _ => Err(()) });
}
}
quote! {
@ -63,3 +70,9 @@ pub fn derive(input: syn::DeriveInput) -> quote::Tokens {
}
}
}
#[darling(attributes(distance), default)]
#[derive(Default, FromDeriveInput)]
struct DistanceInputAttrs {
fallback: Option<Path>,
}

2
components/style_derive/lib.rs
View file

@ -25,7 +25,7 @@ pub fn derive_animate(stream: TokenStream) -> TokenStream {
animate::derive(input).to_string().parse().unwrap()
}
#[proc_macro_derive(ComputeSquaredDistance, attributes(animation))]
#[proc_macro_derive(ComputeSquaredDistance, attributes(animation, distance))]
pub fn derive_compute_squared_distance(stream: TokenStream) -> TokenStream {
let input = syn::parse_derive_input(&stream.to_string()).unwrap();
compute_squared_distance::derive(input).to_string().parse().unwrap()