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256 lines
10 KiB
Rust
256 lines
10 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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//! Specified types for CSS values that are related to transformations.
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use cssparser::Parser;
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use parser::{Parse, ParserContext};
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use selectors::parser::SelectorParseError;
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use style_traits::{ParseError, StyleParseError};
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use values::computed::{Context, LengthOrPercentage as ComputedLengthOrPercentage};
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use values::computed::{Percentage as ComputedPercentage, ToComputedValue};
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use values::computed::transform::TimingFunction as ComputedTimingFunction;
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use values::generics::transform::{StepPosition, TimingFunction as GenericTimingFunction};
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use values::generics::transform::{TimingKeyword, TransformOrigin as GenericTransformOrigin};
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use values::specified::{Integer, Number};
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use values::specified::length::{Length, LengthOrPercentage};
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use values::specified::position::{Side, X, Y};
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/// The specified value of a CSS `<transform-origin>`
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pub type TransformOrigin = GenericTransformOrigin<OriginComponent<X>, OriginComponent<Y>, Length>;
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/// The specified value of a component of a CSS `<transform-origin>`.
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#[cfg_attr(feature = "servo", derive(HeapSizeOf))]
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#[derive(Clone, Debug, HasViewportPercentage, PartialEq, ToCss)]
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pub enum OriginComponent<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>`
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Side(S),
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}
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/// A specified timing function.
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pub type TimingFunction = GenericTimingFunction<Integer, Number>;
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impl Parse for TransformOrigin {
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fn parse<'i, 't>(context: &ParserContext, input: &mut Parser<'i, 't>) -> Result<Self, ParseError<'i>> {
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let parse_depth = |input: &mut Parser| {
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input.try(|i| Length::parse(context, i)).unwrap_or(Length::from_px(0.))
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};
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match input.try(|i| OriginComponent::parse(context, i)) {
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Ok(x_origin @ OriginComponent::Center) => {
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if let Ok(y_origin) = input.try(|i| OriginComponent::parse(context, i)) {
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let depth = parse_depth(input);
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return Ok(Self::new(x_origin, y_origin, depth));
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}
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let y_origin = OriginComponent::Center;
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if let Ok(x_keyword) = input.try(X::parse) {
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let x_origin = OriginComponent::Side(x_keyword);
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let depth = parse_depth(input);
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return Ok(Self::new(x_origin, y_origin, depth));
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}
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let depth = Length::from_px(0.);
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return Ok(Self::new(x_origin, y_origin, depth));
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},
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Ok(x_origin) => {
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if let Ok(y_origin) = input.try(|i| OriginComponent::parse(context, i)) {
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let depth = parse_depth(input);
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return Ok(Self::new(x_origin, y_origin, depth));
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}
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let y_origin = OriginComponent::Center;
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let depth = Length::from_px(0.);
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return Ok(Self::new(x_origin, y_origin, depth));
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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 y_origin = OriginComponent::Side(y_keyword);
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if let Ok(x_keyword) = input.try(X::parse) {
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let x_origin = OriginComponent::Side(x_keyword);
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let depth = parse_depth(input);
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return Ok(Self::new(x_origin, y_origin, depth));
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}
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if input.try(|i| i.expect_ident_matching("center")).is_ok() {
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let x_origin = OriginComponent::Center;
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let depth = parse_depth(input);
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return Ok(Self::new(x_origin, y_origin, depth));
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}
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let x_origin = OriginComponent::Center;
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let depth = Length::from_px(0.);
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Ok(Self::new(x_origin, y_origin, depth))
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}
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}
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impl<S> Parse for OriginComponent<S>
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where S: Parse,
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{
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fn parse<'i, 't>(context: &ParserContext, input: &mut Parser<'i, 't>) -> 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(OriginComponent::Center);
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}
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if let Ok(lop) = input.try(|i| LengthOrPercentage::parse(context, i)) {
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return Ok(OriginComponent::Length(lop));
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}
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let keyword = S::parse(context, input)?;
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Ok(OriginComponent::Side(keyword))
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}
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}
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impl<S> ToComputedValue for OriginComponent<S>
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where S: Side,
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{
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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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OriginComponent::Center => {
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ComputedLengthOrPercentage::Percentage(ComputedPercentage(0.5))
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},
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OriginComponent::Length(ref length) => {
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length.to_computed_value(context)
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},
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OriginComponent::Side(ref keyword) => {
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let p = ComputedPercentage(if keyword.is_start() { 0. } else { 1. });
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ComputedLengthOrPercentage::Percentage(p)
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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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OriginComponent::Length(ToComputedValue::from_computed_value(computed))
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}
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}
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impl<S> OriginComponent<S> {
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/// `0%`
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pub fn zero() -> Self {
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OriginComponent::Length(LengthOrPercentage::Percentage(ComputedPercentage::zero()))
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}
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}
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#[cfg(feature = "gecko")]
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#[inline]
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fn allow_frames_timing() -> bool {
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use gecko_bindings::bindings;
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unsafe { bindings::Gecko_IsFramesTimingEnabled() }
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}
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#[cfg(feature = "servo")]
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#[inline]
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fn allow_frames_timing() -> bool { true }
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impl Parse for TimingFunction {
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fn parse<'i, 't>(context: &ParserContext, input: &mut Parser<'i, 't>) -> Result<Self, ParseError<'i>> {
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if let Ok(keyword) = input.try(TimingKeyword::parse) {
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return Ok(GenericTimingFunction::Keyword(keyword));
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}
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if let Ok(ident) = input.try(|i| i.expect_ident_cloned()) {
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let position = match_ignore_ascii_case! { &ident,
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"step-start" => StepPosition::Start,
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"step-end" => StepPosition::End,
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_ => return Err(SelectorParseError::UnexpectedIdent(ident.clone()).into()),
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};
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return Ok(GenericTimingFunction::Steps(Integer::new(1), position));
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}
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let function = input.expect_function()?.clone();
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input.parse_nested_block(move |i| {
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(match_ignore_ascii_case! { &function,
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"cubic-bezier" => {
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let x1 = Number::parse(context, i)?;
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i.expect_comma()?;
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let y1 = Number::parse(context, i)?;
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i.expect_comma()?;
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let x2 = Number::parse(context, i)?;
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i.expect_comma()?;
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let y2 = Number::parse(context, i)?;
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if x1.get() < 0.0 || x1.get() > 1.0 || x2.get() < 0.0 || x2.get() > 1.0 {
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return Err(StyleParseError::UnspecifiedError.into());
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}
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Ok(GenericTimingFunction::CubicBezier { x1, y1, x2, y2 })
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},
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"steps" => {
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let steps = Integer::parse_positive(context, i)?;
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let position = i.try(|i| {
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i.expect_comma()?;
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StepPosition::parse(i)
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}).unwrap_or(StepPosition::End);
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Ok(GenericTimingFunction::Steps(steps, position))
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},
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"frames" => {
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if allow_frames_timing() {
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let frames = Integer::parse_with_minimum(context, i, 2)?;
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Ok(GenericTimingFunction::Frames(frames))
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} else {
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Err(())
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}
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},
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_ => Err(()),
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}).map_err(|()| StyleParseError::UnexpectedFunction(function.clone()).into())
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})
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}
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}
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impl ToComputedValue for TimingFunction {
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type ComputedValue = ComputedTimingFunction;
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#[inline]
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fn to_computed_value(&self, context: &Context) -> Self::ComputedValue {
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match *self {
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GenericTimingFunction::Keyword(keyword) => {
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GenericTimingFunction::Keyword(keyword)
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},
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GenericTimingFunction::CubicBezier { x1, y1, x2, y2 } => {
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GenericTimingFunction::CubicBezier {
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x1: x1.to_computed_value(context),
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y1: y1.to_computed_value(context),
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x2: x2.to_computed_value(context),
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y2: y2.to_computed_value(context),
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}
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},
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GenericTimingFunction::Steps(steps, position) => {
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GenericTimingFunction::Steps(
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steps.to_computed_value(context) as u32,
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position,
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)
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},
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GenericTimingFunction::Frames(frames) => {
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GenericTimingFunction::Frames(
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frames.to_computed_value(context) as u32,
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)
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},
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}
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}
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#[inline]
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fn from_computed_value(computed: &Self::ComputedValue) -> Self {
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match *computed {
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GenericTimingFunction::Keyword(keyword) => {
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GenericTimingFunction::Keyword(keyword)
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},
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GenericTimingFunction::CubicBezier { ref x1, ref y1, ref x2, ref y2 } => {
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GenericTimingFunction::CubicBezier {
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x1: Number::from_computed_value(x1),
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y1: Number::from_computed_value(y1),
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x2: Number::from_computed_value(x2),
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y2: Number::from_computed_value(y2),
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}
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},
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GenericTimingFunction::Steps(steps, position) => {
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GenericTimingFunction::Steps(
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Integer::from_computed_value(&(steps as i32)),
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position,
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)
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},
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GenericTimingFunction::Frames(frames) => {
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GenericTimingFunction::Frames(
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Integer::from_computed_value(&(frames as i32)),
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)
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},
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}
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}
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}
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