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cd8f96cc9e
This more concrete wrapper type can write a prefix the very first time something is written to it. This allows removing plenty of useless monomorphisations caused by the former W/SequenceWriter<W> pair of types.
94 lines
3.1 KiB
Rust
94 lines
3.1 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 http://mozilla.org/MPL/2.0/. */
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//! Generic types for CSS values that are composed of four sides.
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use cssparser::Parser;
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use parser::{Parse, ParserContext};
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use std::fmt::{self, Write};
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use style_traits::{CssWriter, ParseError, ToCss};
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/// A CSS value made of four components, where its `ToCss` impl will try to
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/// serialize as few components as possible, like for example in `border-width`.
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#[derive(Animate, Clone, ComputeSquaredDistance, Copy, Debug)]
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#[derive(MallocSizeOf, PartialEq, ToComputedValue)]
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pub struct Rect<T>(pub T, pub T, pub T, pub T);
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impl<T> Rect<T> {
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/// Returns a new `Rect<T>` value.
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pub fn new(first: T, second: T, third: T, fourth: T) -> Self {
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Rect(first, second, third, fourth)
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}
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}
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impl<T> Rect<T>
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where T: Clone
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{
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/// Returns a rect with all the values equal to `v`.
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pub fn all(v: T) -> Self {
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Rect::new(v.clone(), v.clone(), v.clone(), v)
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}
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/// Parses a new `Rect<T>` value with the given parse function.
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pub fn parse_with<'i, 't, Parse>(
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context: &ParserContext,
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input: &mut Parser<'i, 't>,
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parse: Parse)
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-> Result<Self, ParseError<'i>>
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where Parse: Fn(&ParserContext, &mut Parser<'i, 't>) -> Result<T, ParseError<'i>>
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{
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let first = parse(context, input)?;
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let second = if let Ok(second) = input.try(|i| parse(context, i)) { second } else {
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// <first>
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return Ok(Self::new(first.clone(), first.clone(), first.clone(), first));
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};
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let third = if let Ok(third) = input.try(|i| parse(context, i)) { third } else {
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// <first> <second>
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return Ok(Self::new(first.clone(), second.clone(), first, second));
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};
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let fourth = if let Ok(fourth) = input.try(|i| parse(context, i)) { fourth } else {
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// <first> <second> <third>
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return Ok(Self::new(first, second.clone(), third, second));
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};
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// <first> <second> <third> <fourth>
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Ok(Self::new(first, second, third, fourth))
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}
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}
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impl<T> Parse for Rect<T>
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where T: Clone + Parse
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{
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#[inline]
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fn parse<'i, 't>(context: &ParserContext, input: &mut Parser<'i, 't>) -> Result<Self, ParseError<'i>> {
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Self::parse_with(context, input, T::parse)
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}
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}
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impl<T> ToCss for Rect<T>
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where T: PartialEq + ToCss
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{
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fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
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where
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W: Write,
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{
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self.0.to_css(dest)?;
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let same_vertical = self.0 == self.2;
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let same_horizontal = self.1 == self.3;
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if same_vertical && same_horizontal && self.0 == self.1 {
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return Ok(());
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}
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dest.write_str(" ")?;
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self.1.to_css(dest)?;
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if same_vertical && same_horizontal {
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return Ok(());
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}
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dest.write_str(" ")?;
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self.2.to_css(dest)?;
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if same_horizontal {
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return Ok(());
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}
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dest.write_str(" ")?;
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self.3.to_css(dest)
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}
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}
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