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style: Add parsing for linear easing function and gate it behind pref

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Differential Revision: https://phabricator.services.mozilla.com/D146839
This commit is contained in:
David Shin 2022-06-07 11:51:24 +00:00 • committed by Martin Robinson
parent b31be826c4
commit 949fd0e172
1 changed files with 38 additions and 1 deletions
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39
components/style/values/specified/easing.rs
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@ -7,7 +7,9 @@ use crate::parser::{Parse, ParserContext};
use crate::values::computed::easing::ComputedLinearStop;
use crate::values::computed::easing::TimingFunction as ComputedTimingFunction;
use crate::values::computed::Percentage as ComputedPercentage;
use crate::values::generics::easing::TimingFunction as GenericTimingFunction;
use crate::values::generics::easing::{
LinearStop as GenericLinearStop, TimingFunction as GenericTimingFunction,
};
use crate::values::generics::easing::{StepPosition, TimingKeyword};
use crate::values::specified::{Integer, Number, Percentage};
use cssparser::Parser;
@ -18,6 +20,16 @@ use style_traits::{ParseError, StyleParseErrorKind};
/// A specified timing function.
pub type TimingFunction = GenericTimingFunction<Integer, Number, Percentage>;
#[cfg(feature = "gecko")]
fn linear_timing_function_enabled() -> bool {
static_prefs::pref!("layout.css.linear-easing-function.enabled")
}
#[cfg(feature = "servo")]
fn linear_timing_function_enabled() -> bool {
false
}
impl Parse for TimingFunction {
fn parse<'i, 't>(
context: &ParserContext,
@ -75,6 +87,31 @@ impl Parse for TimingFunction {
}
Ok(GenericTimingFunction::Steps(steps, position))
},
"linear" => {
if !linear_timing_function_enabled() {
return Err(i.new_custom_error(StyleParseErrorKind::ExperimentalProperty));
}
if i.is_exhausted() {
return Ok(GenericTimingFunction::LinearFunction(crate::OwnedSlice::default()))
}
let entries = i.parse_comma_separated(|i| {
let mut input_start = i.try_parse(|i| Percentage::parse(context, i)).ok();
let mut input_end = i.try_parse(|i| Percentage::parse(context, i)).ok();
let output = Number::parse(context, i)?;
if input_start.is_none() {
debug_assert!(input_end.is_none(), "Input end parsed without input start?");
input_start = i.try_parse(|i| Percentage::parse(context, i)).ok();
input_end = i.try_parse(|i| Percentage::parse(context, i)).ok();
}
Ok(GenericLinearStop {
output,
input_start: input_start.into(),
input_end: input_end.into()
})
})?;
Ok(GenericTimingFunction::LinearFunction(crate::OwnedSlice::from(entries)))
},
_ => Err(()),
})
.map_err(|()| {