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Servo currently uses `heapsize`, but Stylo/Gecko use `malloc_size_of`. `malloc_size_of` is better -- it handles various cases that `heapsize` does not -- so this patch changes Servo to use `malloc_size_of`. This patch makes the following changes to the `malloc_size_of` crate. - Adds `MallocSizeOf` trait implementations for numerous types, some built-in (e.g. `VecDeque`), some external and Servo-only (e.g. `string_cache`). - Makes `enclosing_size_of_op` optional, because vanilla jemalloc doesn't support that operation. - For `HashSet`/`HashMap`, falls back to a computed estimate when `enclosing_size_of_op` isn't available. - Adds an extern "C" `malloc_size_of` function that does the actual heap measurement; this is based on the same functions from the `heapsize` crate. This patch makes the following changes elsewhere. - Converts all the uses of `heapsize` to instead use `malloc_size_of`. - Disables the "heapsize"/"heap_size" feature for the external crates that provide it. - Removes the `HeapSizeOf` implementation from `hashglobe`. - Adds `ignore` annotations to a few `Rc`/`Arc`, because `malloc_size_of` doesn't derive those types, unlike `heapsize`.
368 lines
14 KiB
Rust
368 lines
14 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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//! CSS handling for the specified value of
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//! [`position`][position]s
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//!
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//! [position]: https://drafts.csswg.org/css-backgrounds-3/#position
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use cssparser::Parser;
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use parser::{Parse, ParserContext};
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use std::fmt;
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use style_traits::{ToCss, ParseError};
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use values::computed::{CalcLengthOrPercentage, LengthOrPercentage as ComputedLengthOrPercentage};
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use values::computed::{Context, Percentage, ToComputedValue};
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use values::generics::position::Position as GenericPosition;
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use values::specified::{AllowQuirks, LengthOrPercentage};
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use values::specified::transform::OriginComponent;
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/// The specified value of a CSS `<position>`
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pub type Position = GenericPosition<HorizontalPosition, VerticalPosition>;
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/// The specified value of a horizontal position.
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pub type HorizontalPosition = PositionComponent<X>;
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/// The specified value of a vertical position.
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pub type VerticalPosition = PositionComponent<Y>;
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/// The specified value of a component of a CSS `<position>`.
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#[derive(Clone, Debug, MallocSizeOf, PartialEq, ToCss)]
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pub enum PositionComponent<S> {
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/// `center`
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Center,
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/// `<lop>`
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Length(LengthOrPercentage),
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/// `<side> <lop>?`
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Side(S, Option<LengthOrPercentage>),
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}
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define_css_keyword_enum! { X:
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"left" => Left,
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"right" => Right,
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}
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add_impls_for_keyword_enum!(X);
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define_css_keyword_enum! { Y:
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"top" => Top,
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"bottom" => Bottom,
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}
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add_impls_for_keyword_enum!(Y);
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impl Parse for Position {
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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_quirky(context, input, AllowQuirks::No)
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}
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}
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impl Position {
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/// Parses a `<position>`, with quirks.
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pub fn parse_quirky<'i, 't>(context: &ParserContext,
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input: &mut Parser<'i, 't>,
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allow_quirks: AllowQuirks)
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-> Result<Self, ParseError<'i>> {
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match input.try(|i| PositionComponent::parse_quirky(context, i, allow_quirks)) {
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Ok(x_pos @ PositionComponent::Center) => {
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if let Ok(y_pos) = input.try(|i|
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PositionComponent::parse_quirky(context, i, allow_quirks)) {
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return Ok(Self::new(x_pos, y_pos));
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}
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let x_pos = input
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.try(|i| PositionComponent::parse_quirky(context, i, allow_quirks))
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.unwrap_or(x_pos);
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let y_pos = PositionComponent::Center;
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return Ok(Self::new(x_pos, y_pos));
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},
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Ok(PositionComponent::Side(x_keyword, lop)) => {
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if input.try(|i| i.expect_ident_matching("center")).is_ok() {
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let x_pos = PositionComponent::Side(x_keyword, lop);
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let y_pos = PositionComponent::Center;
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return Ok(Self::new(x_pos, y_pos));
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}
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if let Ok(y_keyword) = input.try(Y::parse) {
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let y_lop = input.try(|i| LengthOrPercentage::parse_quirky(context, i, allow_quirks)).ok();
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let x_pos = PositionComponent::Side(x_keyword, lop);
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let y_pos = PositionComponent::Side(y_keyword, y_lop);
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return Ok(Self::new(x_pos, y_pos));
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}
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let x_pos = PositionComponent::Side(x_keyword, None);
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let y_pos = lop.map_or(PositionComponent::Center, PositionComponent::Length);
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return Ok(Self::new(x_pos, y_pos));
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},
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Ok(x_pos @ PositionComponent::Length(_)) => {
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if let Ok(y_keyword) = input.try(Y::parse) {
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let y_pos = PositionComponent::Side(y_keyword, None);
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return Ok(Self::new(x_pos, y_pos));
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}
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if let Ok(y_lop) = input.try(|i| LengthOrPercentage::parse_quirky(context, i, allow_quirks)) {
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let y_pos = PositionComponent::Length(y_lop);
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return Ok(Self::new(x_pos, y_pos));
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}
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let y_pos = PositionComponent::Center;
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let _ = input.try(|i| i.expect_ident_matching("center"));
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return Ok(Self::new(x_pos, y_pos));
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},
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Err(_) => {},
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}
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let y_keyword = Y::parse(input)?;
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let lop_and_x_pos: Result<_, ParseError> = input.try(|i| {
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let y_lop = i.try(|i| LengthOrPercentage::parse_quirky(context, i, allow_quirks)).ok();
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if let Ok(x_keyword) = i.try(X::parse) {
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let x_lop = i.try(|i| LengthOrPercentage::parse_quirky(context, i, allow_quirks)).ok();
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let x_pos = PositionComponent::Side(x_keyword, x_lop);
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return Ok((y_lop, x_pos));
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};
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i.expect_ident_matching("center")?;
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let x_pos = PositionComponent::Center;
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Ok((y_lop, x_pos))
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});
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if let Ok((y_lop, x_pos)) = lop_and_x_pos {
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let y_pos = PositionComponent::Side(y_keyword, y_lop);
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return Ok(Self::new(x_pos, y_pos));
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}
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let x_pos = PositionComponent::Center;
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let y_pos = PositionComponent::Side(y_keyword, None);
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Ok(Self::new(x_pos, y_pos))
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}
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/// `center center`
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#[inline]
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pub fn center() -> Self {
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Self::new(PositionComponent::Center, PositionComponent::Center)
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}
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}
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impl ToCss for Position {
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fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
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match (&self.horizontal, &self.vertical) {
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(x_pos @ &PositionComponent::Side(_, Some(_)), &PositionComponent::Length(ref y_lop)) => {
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x_pos.to_css(dest)?;
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dest.write_str(" top ")?;
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y_lop.to_css(dest)
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},
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(&PositionComponent::Length(ref x_lop), y_pos @ &PositionComponent::Side(_, Some(_))) => {
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dest.write_str("left ")?;
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x_lop.to_css(dest)?;
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dest.write_str(" ")?;
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y_pos.to_css(dest)
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},
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(x_pos, y_pos) => {
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x_pos.to_css(dest)?;
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dest.write_str(" ")?;
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y_pos.to_css(dest)
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},
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}
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}
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}
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impl<S: Parse> Parse for PositionComponent<S> {
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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_quirky(context, input, AllowQuirks::No)
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}
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}
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impl<S: Parse> PositionComponent<S> {
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/// Parses a component of a CSS position, with quirks.
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pub fn parse_quirky<'i, 't>(context: &ParserContext,
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input: &mut Parser<'i, 't>,
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allow_quirks: AllowQuirks)
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-> Result<Self, ParseError<'i>> {
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if input.try(|i| i.expect_ident_matching("center")).is_ok() {
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return Ok(PositionComponent::Center);
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}
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if let Ok(lop) = input.try(|i| LengthOrPercentage::parse_quirky(context, i, allow_quirks)) {
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return Ok(PositionComponent::Length(lop));
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}
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let keyword = S::parse(context, input)?;
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let lop = input.try(|i| LengthOrPercentage::parse_quirky(context, i, allow_quirks)).ok();
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Ok(PositionComponent::Side(keyword, lop))
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}
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}
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impl<S> PositionComponent<S> {
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/// `0%`
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pub fn zero() -> Self {
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PositionComponent::Length(LengthOrPercentage::Percentage(Percentage::zero()))
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}
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}
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impl<S: Side> ToComputedValue for PositionComponent<S> {
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type ComputedValue = ComputedLengthOrPercentage;
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fn to_computed_value(&self, context: &Context) -> Self::ComputedValue {
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match *self {
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PositionComponent::Center => {
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ComputedLengthOrPercentage::Percentage(Percentage(0.5))
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},
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PositionComponent::Side(ref keyword, None) => {
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let p = Percentage(if keyword.is_start() { 0. } else { 1. });
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ComputedLengthOrPercentage::Percentage(p)
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},
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PositionComponent::Side(ref keyword, Some(ref length)) if !keyword.is_start() => {
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match length.to_computed_value(context) {
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ComputedLengthOrPercentage::Length(length) => {
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ComputedLengthOrPercentage::Calc(
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CalcLengthOrPercentage::new(-length, Some(Percentage::hundred())))
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},
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ComputedLengthOrPercentage::Percentage(p) => {
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ComputedLengthOrPercentage::Percentage(Percentage(1.0 - p.0))
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},
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ComputedLengthOrPercentage::Calc(calc) => {
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let p = Percentage(1. - calc.percentage.map_or(0., |p| p.0));
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let l = -calc.unclamped_length();
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ComputedLengthOrPercentage::Calc(CalcLengthOrPercentage::new(l, Some(p)))
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},
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}
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},
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PositionComponent::Side(_, Some(ref length)) |
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PositionComponent::Length(ref length) => {
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length.to_computed_value(context)
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},
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}
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}
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fn from_computed_value(computed: &Self::ComputedValue) -> Self {
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PositionComponent::Length(ToComputedValue::from_computed_value(computed))
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}
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}
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impl<S: Side> PositionComponent<S> {
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/// The initial specified value of a position component, i.e. the start side.
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pub fn initial_specified_value() -> Self {
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PositionComponent::Side(S::start(), None)
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}
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}
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/// Represents a side, either horizontal or vertical, of a CSS position.
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pub trait Side {
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/// Returns the start side.
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fn start() -> Self;
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/// Returns whether this side is the start side.
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fn is_start(&self) -> bool;
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}
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impl Side for X {
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#[inline]
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fn start() -> Self {
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X::Left
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}
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#[inline]
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fn is_start(&self) -> bool {
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*self == X::Left
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}
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}
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impl Side for Y {
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#[inline]
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fn start() -> Self {
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Y::Top
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}
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#[inline]
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fn is_start(&self) -> bool {
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*self == Y::Top
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}
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}
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/// The specified value of a legacy CSS `<position>`
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/// Modern position syntax supports 3 and 4-value syntax. That means:
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/// If three or four values are given, then each <percentage> or <length> represents an offset
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/// and must be preceded by a keyword, which specifies from which edge the offset is given.
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/// For example, `bottom 10px right 20px` represents a `10px` vertical
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/// offset up from the bottom edge and a `20px` horizontal offset leftward from the right edge.
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/// If three values are given, the missing offset is assumed to be zero.
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/// But for some historical reasons we need to keep CSS Level 2 syntax which only supports up to
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/// 2-value. This type represents this 2-value syntax.
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pub type LegacyPosition = GenericPosition<LegacyHPosition, LegacyVPosition>;
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/// The specified value of a horizontal position.
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pub type LegacyHPosition = OriginComponent<X>;
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/// The specified value of a vertical position.
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pub type LegacyVPosition = OriginComponent<Y>;
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impl Parse for LegacyPosition {
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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_quirky(context, input, AllowQuirks::No)
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}
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}
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impl LegacyPosition {
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/// Parses a `<position>`, with quirks.
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pub fn parse_quirky<'i, 't>(context: &ParserContext,
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input: &mut Parser<'i, 't>,
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allow_quirks: AllowQuirks)
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-> Result<Self, ParseError<'i>> {
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match input.try(|i| OriginComponent::parse(context, i)) {
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Ok(x_pos @ OriginComponent::Center) => {
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if let Ok(y_pos) = input.try(|i|
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OriginComponent::parse(context, i)) {
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return Ok(Self::new(x_pos, y_pos));
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}
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let x_pos = input
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.try(|i| OriginComponent::parse(context, i))
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.unwrap_or(x_pos);
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let y_pos = OriginComponent::Center;
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return Ok(Self::new(x_pos, y_pos));
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},
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Ok(OriginComponent::Side(x_keyword)) => {
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if let Ok(y_keyword) = input.try(Y::parse) {
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let x_pos = OriginComponent::Side(x_keyword);
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let y_pos = OriginComponent::Side(y_keyword);
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return Ok(Self::new(x_pos, y_pos));
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}
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let x_pos = OriginComponent::Side(x_keyword);
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if let Ok(y_lop) = input.try(|i| LengthOrPercentage::parse_quirky(context, i, allow_quirks)) {
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return Ok(Self::new(x_pos, OriginComponent::Length(y_lop)))
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}
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let _ = input.try(|i| i.expect_ident_matching("center"));
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return Ok(Self::new(x_pos, OriginComponent::Center));
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},
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Ok(x_pos @ OriginComponent::Length(_)) => {
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if let Ok(y_keyword) = input.try(Y::parse) {
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let y_pos = OriginComponent::Side(y_keyword);
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return Ok(Self::new(x_pos, y_pos));
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}
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if let Ok(y_lop) = input.try(|i| LengthOrPercentage::parse_quirky(context, i, allow_quirks)) {
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let y_pos = OriginComponent::Length(y_lop);
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return Ok(Self::new(x_pos, y_pos));
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}
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let _ = input.try(|i| i.expect_ident_matching("center"));
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return Ok(Self::new(x_pos, OriginComponent::Center));
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},
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Err(_) => {},
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}
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let y_keyword = Y::parse(input)?;
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let x_pos: Result<_, ParseError> = input.try(|i| {
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if let Ok(x_keyword) = i.try(X::parse) {
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let x_pos = OriginComponent::Side(x_keyword);
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return Ok(x_pos);
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}
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i.expect_ident_matching("center")?;
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Ok(OriginComponent::Center)
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});
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if let Ok(x_pos) = x_pos {
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let y_pos = OriginComponent::Side(y_keyword);
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return Ok(Self::new(x_pos, y_pos));
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}
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let x_pos = OriginComponent::Center;
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let y_pos = OriginComponent::Side(y_keyword);
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Ok(Self::new(x_pos, y_pos))
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}
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/// `center center`
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#[inline]
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pub fn center() -> Self {
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Self::new(OriginComponent::Center, OriginComponent::Center)
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}
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}
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impl ToCss for LegacyPosition {
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fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
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self.horizontal.to_css(dest)?;
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dest.write_str(" ")?;
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self.vertical.to_css(dest)
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}
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}
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