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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/. */
//! Generic types for CSS values that are composed of four sides.
use crate::parser::{Parse, ParserContext};
use cssparser::Parser;
use std::fmt::{self, Write};
use style_traits::{CssWriter, ParseError, ToCss};
/// A CSS value made of four components, where its `ToCss` impl will try to
/// serialize as few components as possible, like for example in `border-width`.
#[derive(
Animate,
Clone,
ComputeSquaredDistance,
Copy,
Debug,
MallocSizeOf,
PartialEq,
SpecifiedValueInfo,
ToAnimatedValue,
ToAnimatedZero,
ToComputedValue,
ToResolvedValue,
ToShmem,
)]
#[repr(C)]
pub struct Rect<T>(pub T, pub T, pub T, pub T);
impl<T> Rect<T> {
/// Returns a new `Rect<T>` value.
pub fn new(first: T, second: T, third: T, fourth: T) -> Self {
Rect(first, second, third, fourth)
}
}
impl<T> Rect<T>
where
T: Clone,
{
/// Returns a rect with all the values equal to `v`.
pub fn all(v: T) -> Self {
Rect::new(v.clone(), v.clone(), v.clone(), v)
}
/// Parses a new `Rect<T>` value with the given parse function.
pub fn parse_with<'i, 't, Parse>(
context: &ParserContext,
input: &mut Parser<'i, 't>,
parse: Parse,
) -> Result<Self, ParseError<'i>>
where
Parse: Fn(&ParserContext, &mut Parser<'i, 't>) -> Result<T, ParseError<'i>>,
{
let first = parse(context, input)?;
let second = if let Ok(second) = input.try_parse(|i| parse(context, i)) {
second
} else {
// <first>
return Ok(Self::new(
first.clone(),
first.clone(),
first.clone(),
first,
));
};
let third = if let Ok(third) = input.try_parse(|i| parse(context, i)) {
third
} else {
// <first> <second>
return Ok(Self::new(first.clone(), second.clone(), first, second));
};
let fourth = if let Ok(fourth) = input.try_parse(|i| parse(context, i)) {
fourth
} else {
// <first> <second> <third>
return Ok(Self::new(first, second.clone(), third, second));
};
// <first> <second> <third> <fourth>
Ok(Self::new(first, second, third, fourth))
}
}
impl<T> Parse for Rect<T>
where
T: Clone + Parse,
{
#[inline]
fn parse<'i, 't>(
context: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<Self, ParseError<'i>> {
Self::parse_with(context, input, T::parse)
}
}
impl<T> ToCss for Rect<T>
where
T: PartialEq + ToCss,
{
fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
where
W: Write,
{
self.0.to_css(dest)?;
let same_vertical = self.0 == self.2;
let same_horizontal = self.1 == self.3;
if same_vertical && same_horizontal && self.0 == self.1 {
return Ok(());
}
dest.write_char(' ')?;
self.1.to_css(dest)?;
if same_vertical && same_horizontal {
return Ok(());
}
dest.write_char(' ')?;
self.2.to_css(dest)?;
if same_horizontal {
return Ok(());
}
dest.write_char(' ')?;
self.3.to_css(dest)
}
}
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