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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/. */
//! Generic types for text properties.
use app_units::Au;
use crate::parser::ParserContext;
use crate::values::animated::{Animate, Procedure, ToAnimatedZero};
use crate::values::distance::{ComputeSquaredDistance, SquaredDistance};
use cssparser::Parser;
use style_traits::ParseError;
/// A generic value for the `initial-letter` property.
#[derive(
Clone, Copy, Debug, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToComputedValue, ToCss,
)]
pub enum InitialLetter<Number, Integer> {
/// `normal`
Normal,
/// `<number> <integer>?`
Specified(Number, Option<Integer>),
}
impl<N, I> InitialLetter<N, I> {
/// Returns `normal`.
#[inline]
pub fn normal() -> Self {
InitialLetter::Normal
}
}
/// A generic spacing value for the `letter-spacing` and `word-spacing` properties.
#[derive(
Clone, Copy, Debug, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToComputedValue, ToCss,
)]
pub enum Spacing<Value> {
/// `normal`
Normal,
/// `<value>`
Value(Value),
}
impl<Value> Spacing<Value> {
/// Returns `normal`.
#[inline]
pub fn normal() -> Self {
Spacing::Normal
}
/// Parses.
#[inline]
pub fn parse_with<'i, 't, F>(
context: &ParserContext,
input: &mut Parser<'i, 't>,
parse: F,
) -> Result<Self, ParseError<'i>>
where
F: FnOnce(&ParserContext, &mut Parser<'i, 't>) -> Result<Value, ParseError<'i>>,
{
if input.r#try(|i| i.expect_ident_matching("normal")).is_ok() {
return Ok(Spacing::Normal);
}
parse(context, input).map(Spacing::Value)
}
/// Returns the spacing value, if not `normal`.
#[inline]
pub fn value(&self) -> Option<&Value> {
match *self {
Spacing::Normal => None,
Spacing::Value(ref value) => Some(value),
}
}
}
impl<Value> Animate for Spacing<Value>
where
Value: Animate + From<Au>,
{
#[inline]
fn animate(&self, other: &Self, procedure: Procedure) -> Result<Self, ()> {
if let (&Spacing::Normal, &Spacing::Normal) = (self, other) {
return Ok(Spacing::Normal);
}
let zero = Value::from(Au(0));
let this = self.value().unwrap_or(&zero);
let other = other.value().unwrap_or(&zero);
Ok(Spacing::Value(this.animate(other, procedure)?))
}
}
impl<V> ComputeSquaredDistance for Spacing<V>
where
V: ComputeSquaredDistance + From<Au>,
{
#[inline]
fn compute_squared_distance(&self, other: &Self) -> Result<SquaredDistance, ()> {
let zero = V::from(Au(0));
let this = self.value().unwrap_or(&zero);
let other = other.value().unwrap_or(&zero);
this.compute_squared_distance(other)
}
}
impl<V> ToAnimatedZero for Spacing<V>
where
V: From<Au>,
{
#[inline]
fn to_animated_zero(&self) -> Result<Self, ()> {
Err(())
}
}
/// A generic value for the `line-height` property.
#[derive(
Animate,
Clone,
ComputeSquaredDistance,
Copy,
Debug,
MallocSizeOf,
PartialEq,
SpecifiedValueInfo,
ToAnimatedValue,
ToCss,
)]
pub enum LineHeight<Number, LengthOrPercentage> {
/// `normal`
Normal,
/// `-moz-block-height`
#[cfg(feature = "gecko")]
MozBlockHeight,
/// `<number>`
Number(Number),
/// `<length-or-percentage>`
Length(LengthOrPercentage),
}
impl<N, L> ToAnimatedZero for LineHeight<N, L> {
#[inline]
fn to_animated_zero(&self) -> Result<Self, ()> {
Err(())
}
}
impl<N, L> LineHeight<N, L> {
/// Returns `normal`.
#[inline]
pub fn normal() -> Self {
LineHeight::Normal
}
}
/// A generic value for the `-moz-tab-size` property.
#[derive(
Animate,
Clone,
ComputeSquaredDistance,
Copy,
Debug,
MallocSizeOf,
PartialEq,
SpecifiedValueInfo,
ToAnimatedValue,
ToAnimatedZero,
ToComputedValue,
ToCss,
)]
pub enum MozTabSize<Number, Length> {
/// A number.
Number(Number),
/// A length.
Length(Length),
}
|
