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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/. */
+
+//! CSS handling for the specified value of
+//! [`image`][image]s
+//!
+//! [image]: https://drafts.csswg.org/css-images/#image-values
+
+use crate::custom_properties::SpecifiedValue;
+use crate::parser::{Parse, ParserContext};
+use crate::stylesheets::CorsMode;
+use crate::values::generics::image::PaintWorklet;
+use crate::values::generics::image::{
+ self as generic, Circle, Ellipse, GradientCompatMode, ShapeExtent,
+};
+use crate::values::generics::position::Position as GenericPosition;
+use crate::values::generics::NonNegative;
+use crate::values::specified::position::{HorizontalPositionKeyword, VerticalPositionKeyword};
+use crate::values::specified::position::{Position, PositionComponent, Side};
+use crate::values::specified::url::SpecifiedImageUrl;
+use crate::values::specified::{
+ Angle, AngleOrPercentage, Color, Length, LengthPercentage, NonNegativeLength,
+ NonNegativeLengthPercentage, Resolution,
+};
+use crate::values::specified::{Number, NumberOrPercentage, Percentage};
+use crate::Atom;
+use cssparser::{Delimiter, Parser, Token};
+use selectors::parser::SelectorParseErrorKind;
+#[cfg(feature = "servo")]
+use servo_url::ServoUrl;
+use std::cmp::Ordering;
+use std::fmt::{self, Write};
+use style_traits::{CssType, CssWriter, KeywordsCollectFn, ParseError};
+use style_traits::{SpecifiedValueInfo, StyleParseErrorKind, ToCss};
+
+/// Specified values for an image according to CSS-IMAGES.
+/// <https://drafts.csswg.org/css-images/#image-values>
+pub type Image =
+ generic::Image<Gradient, MozImageRect, SpecifiedImageUrl, Color, Percentage, Resolution>;
+
+// Images should remain small, see https://github.com/servo/servo/pull/18430
+size_of_test!(Image, 16);
+
+/// Specified values for a CSS gradient.
+/// <https://drafts.csswg.org/css-images/#gradients>
+pub type Gradient = generic::Gradient<
+ LineDirection,
+ LengthPercentage,
+ NonNegativeLength,
+ NonNegativeLengthPercentage,
+ Position,
+ Angle,
+ AngleOrPercentage,
+ Color,
+>;
+
+/// Specified values for CSS cross-fade
+/// cross-fade( CrossFadeElement, ...)
+/// <https://drafts.csswg.org/css-images-4/#cross-fade-function>
+pub type CrossFade = generic::CrossFade<Image, Color, Percentage>;
+/// CrossFadeElement = percent? CrossFadeImage
+pub type CrossFadeElement = generic::CrossFadeElement<Image, Color, Percentage>;
+/// CrossFadeImage = image | color
+pub type CrossFadeImage = generic::CrossFadeImage<Image, Color>;
+
+/// `image-set()`
+pub type ImageSet = generic::ImageSet<Image, Resolution>;
+
+/// Each of the arguments to `image-set()`
+pub type ImageSetItem = generic::ImageSetItem<Image, Resolution>;
+
+type LengthPercentageItemList = crate::OwnedSlice<generic::GradientItem<Color, LengthPercentage>>;
+
+#[cfg(feature = "gecko")]
+fn cross_fade_enabled() -> bool {
+ static_prefs::pref!("layout.css.cross-fade.enabled")
+}
+
+#[cfg(feature = "servo")]
+fn cross_fade_enabled() -> bool {
+ false
+}
+
+impl SpecifiedValueInfo for Gradient {
+ const SUPPORTED_TYPES: u8 = CssType::GRADIENT;
+
+ fn collect_completion_keywords(f: KeywordsCollectFn) {
+ // This list here should keep sync with that in Gradient::parse.
+ f(&[
+ "linear-gradient",
+ "-webkit-linear-gradient",
+ "-moz-linear-gradient",
+ "repeating-linear-gradient",
+ "-webkit-repeating-linear-gradient",
+ "-moz-repeating-linear-gradient",
+ "radial-gradient",
+ "-webkit-radial-gradient",
+ "-moz-radial-gradient",
+ "repeating-radial-gradient",
+ "-webkit-repeating-radial-gradient",
+ "-moz-repeating-radial-gradient",
+ "-webkit-gradient",
+ "conic-gradient",
+ "repeating-conic-gradient",
+ ]);
+ }
+}
+
+// Need to manually implement as whether or not cross-fade shows up in
+// completions & etc is dependent on it being enabled.
+impl<Image, Color, Percentage> SpecifiedValueInfo for generic::CrossFade<Image, Color, Percentage> {
+ const SUPPORTED_TYPES: u8 = 0;
+
+ fn collect_completion_keywords(f: KeywordsCollectFn) {
+ if cross_fade_enabled() {
+ f(&["cross-fade"]);
+ }
+ }
+}
+
+impl<Image, Resolution> SpecifiedValueInfo for generic::ImageSet<Image, Resolution> {
+ const SUPPORTED_TYPES: u8 = 0;
+
+ fn collect_completion_keywords(f: KeywordsCollectFn) {
+ f(&["image-set"]);
+ }
+}
+
+/// A specified gradient line direction.
+///
+/// FIXME(emilio): This should be generic over Angle.
+#[derive(Clone, Debug, MallocSizeOf, PartialEq, ToShmem)]
+pub enum LineDirection {
+ /// An angular direction.
+ Angle(Angle),
+ /// A horizontal direction.
+ Horizontal(HorizontalPositionKeyword),
+ /// A vertical direction.
+ Vertical(VerticalPositionKeyword),
+ /// A direction towards a corner of a box.
+ Corner(HorizontalPositionKeyword, VerticalPositionKeyword),
+}
+
+/// A specified ending shape.
+pub type EndingShape = generic::EndingShape<NonNegativeLength, NonNegativeLengthPercentage>;
+
+/// Specified values for `moz-image-rect`
+/// -moz-image-rect(<uri>, top, right, bottom, left);
+#[cfg(all(feature = "gecko", not(feature = "cbindgen")))]
+pub type MozImageRect = generic::GenericMozImageRect<NumberOrPercentage, SpecifiedImageUrl>;
+
+#[cfg(not(feature = "gecko"))]
+#[derive(
+ Clone,
+ Debug,
+ MallocSizeOf,
+ PartialEq,
+ SpecifiedValueInfo,
+ ToComputedValue,
+ ToCss,
+ ToResolvedValue,
+ ToShmem,
+)]
+/// Empty enum on non-Gecko
+pub enum MozImageRect {}
+
+impl Parse for Image {
+ fn parse<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ ) -> Result<Image, ParseError<'i>> {
+ Image::parse_with_cors_mode(
+ context,
+ input,
+ CorsMode::None,
+ /* allow_none = */ true,
+ /* only_url = */ false,
+ )
+ }
+}
+
+impl Image {
+ fn parse_with_cors_mode<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ cors_mode: CorsMode,
+ allow_none: bool,
+ only_url: bool,
+ ) -> Result<Image, ParseError<'i>> {
+ if allow_none && input.try_parse(|i| i.expect_ident_matching("none")).is_ok() {
+ return Ok(generic::Image::None);
+ }
+
+ if let Ok(url) = input
+ .try_parse(|input| SpecifiedImageUrl::parse_with_cors_mode(context, input, cors_mode))
+ {
+ return Ok(generic::Image::Url(url));
+ }
+
+ if let Ok(is) =
+ input.try_parse(|input| ImageSet::parse(context, input, cors_mode, only_url))
+ {
+ return Ok(generic::Image::ImageSet(Box::new(is)));
+ }
+
+ if only_url {
+ return Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError));
+ }
+
+ if let Ok(gradient) = input.try_parse(|i| Gradient::parse(context, i)) {
+ return Ok(generic::Image::Gradient(Box::new(gradient)));
+ }
+
+ if cross_fade_enabled() {
+ if let Ok(cf) = input.try_parse(|input| CrossFade::parse(context, input, cors_mode)) {
+ return Ok(generic::Image::CrossFade(Box::new(cf)));
+ }
+ }
+ #[cfg(feature = "servo-layout-2013")]
+ {
+ if let Ok(paint_worklet) = input.try_parse(|i| PaintWorklet::parse(context, i)) {
+ return Ok(generic::Image::PaintWorklet(paint_worklet));
+ }
+ }
+ #[cfg(feature = "gecko")]
+ {
+ if let Ok(image_rect) =
+ input.try_parse(|input| MozImageRect::parse(context, input, cors_mode))
+ {
+ return Ok(generic::Image::Rect(Box::new(image_rect)));
+ }
+ Ok(generic::Image::Element(Image::parse_element(input)?))
+ }
+ #[cfg(not(feature = "gecko"))]
+ Err(input.new_error_for_next_token())
+ }
+}
+
+impl Image {
+ /// Creates an already specified image value from an already resolved URL
+ /// for insertion in the cascade.
+ #[cfg(feature = "servo")]
+ pub fn for_cascade(url: ServoUrl) -> Self {
+ use crate::values::CssUrl;
+ generic::Image::Url(CssUrl::for_cascade(url))
+ }
+
+ /// Parses a `-moz-element(# <element-id>)`.
+ #[cfg(feature = "gecko")]
+ fn parse_element<'i, 't>(input: &mut Parser<'i, 't>) -> Result<Atom, ParseError<'i>> {
+ input.try_parse(|i| i.expect_function_matching("-moz-element"))?;
+ let location = input.current_source_location();
+ input.parse_nested_block(|i| match *i.next()? {
+ Token::IDHash(ref id) => Ok(Atom::from(id.as_ref())),
+ ref t => Err(location.new_unexpected_token_error(t.clone())),
+ })
+ }
+
+ /// Provides an alternate method for parsing that associates the URL with
+ /// anonymous CORS headers.
+ pub fn parse_with_cors_anonymous<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ ) -> Result<Image, ParseError<'i>> {
+ Self::parse_with_cors_mode(
+ context,
+ input,
+ CorsMode::Anonymous,
+ /* allow_none = */ true,
+ /* only_url = */ false,
+ )
+ }
+
+ /// Provides an alternate method for parsing, but only for urls.
+ pub fn parse_only_url<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ ) -> Result<Image, ParseError<'i>> {
+ Self::parse_with_cors_mode(
+ context,
+ input,
+ CorsMode::None,
+ /* allow_none = */ false,
+ /* only_url = */ true,
+ )
+ }
+}
+
+impl CrossFade {
+ /// cross-fade() = cross-fade( <cf-image># )
+ fn parse<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ cors_mode: CorsMode,
+ ) -> Result<Self, ParseError<'i>> {
+ input.expect_function_matching("cross-fade")?;
+ let elements = input.parse_nested_block(|input| {
+ input.parse_comma_separated(|input| CrossFadeElement::parse(context, input, cors_mode))
+ })?;
+ let elements = crate::OwnedSlice::from(elements);
+ Ok(Self { elements })
+ }
+}
+
+impl CrossFadeElement {
+ fn parse_percentage<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ ) -> Option<Percentage> {
+ // We clamp our values here as this is the way that Safari and Chrome's
+ // implementation handle out-of-bounds percentages but whether or not
+ // this behavior follows the specification is still being discussed.
+ // See: <https://github.com/w3c/csswg-drafts/issues/5333>
+ input
+ .try_parse(|input| Percentage::parse_non_negative(context, input))
+ .ok()
+ .map(|p| p.clamp_to_hundred())
+ }
+
+ /// <cf-image> = <percentage>? && [ <image> | <color> ]
+ fn parse<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ cors_mode: CorsMode,
+ ) -> Result<Self, ParseError<'i>> {
+ // Try and parse a leading percent sign.
+ let mut percent = Self::parse_percentage(context, input);
+ // Parse the image
+ let image = CrossFadeImage::parse(context, input, cors_mode)?;
+ // Try and parse a trailing percent sign.
+ if percent.is_none() {
+ percent = Self::parse_percentage(context, input);
+ }
+ Ok(Self {
+ percent: percent.into(),
+ image,
+ })
+ }
+}
+
+impl CrossFadeImage {
+ fn parse<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ cors_mode: CorsMode,
+ ) -> Result<Self, ParseError<'i>> {
+ if let Ok(image) = input.try_parse(|input| {
+ Image::parse_with_cors_mode(
+ context, input, cors_mode, /* allow_none = */ false,
+ /* only_url = */ false,
+ )
+ }) {
+ return Ok(Self::Image(image));
+ }
+ Ok(Self::Color(Color::parse(context, input)?))
+ }
+}
+
+impl ImageSet {
+ fn parse<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ cors_mode: CorsMode,
+ only_url: bool,
+ ) -> Result<Self, ParseError<'i>> {
+ let function = input.expect_function()?;
+ match_ignore_ascii_case! { &function,
+ "-webkit-image-set" | "image-set" => {},
+ _ => {
+ let func = function.clone();
+ return Err(input.new_custom_error(StyleParseErrorKind::UnexpectedFunction(func)));
+ }
+ }
+ let items = input.parse_nested_block(|input| {
+ input.parse_comma_separated(|input| {
+ ImageSetItem::parse(context, input, cors_mode, only_url)
+ })
+ })?;
+ Ok(Self {
+ selected_index: 0,
+ items: items.into(),
+ })
+ }
+}
+
+impl ImageSetItem {
+ fn parse_type<'i>(p: &mut Parser<'i, '_>) -> Result<crate::OwnedStr, ParseError<'i>> {
+ p.expect_function_matching("type")?;
+ p.parse_nested_block(|input| Ok(input.expect_string()?.as_ref().to_owned().into()))
+ }
+
+ fn parse<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ cors_mode: CorsMode,
+ only_url: bool,
+ ) -> Result<Self, ParseError<'i>> {
+ let image = match input.try_parse(|i| i.expect_url_or_string()) {
+ Ok(url) => Image::Url(SpecifiedImageUrl::parse_from_string(
+ url.as_ref().into(),
+ context,
+ cors_mode,
+ )),
+ Err(..) => Image::parse_with_cors_mode(
+ context, input, cors_mode, /* allow_none = */ false,
+ /* only_url = */ only_url,
+ )?,
+ };
+
+ let mut resolution = input
+ .try_parse(|input| Resolution::parse(context, input))
+ .ok();
+ let mime_type = input.try_parse(Self::parse_type).ok();
+
+ // Try to parse resolution after type().
+ if mime_type.is_some() && resolution.is_none() {
+ resolution = input
+ .try_parse(|input| Resolution::parse(context, input))
+ .ok();
+ }
+
+ let resolution = resolution.unwrap_or(Resolution::X(1.0));
+ let has_mime_type = mime_type.is_some();
+ let mime_type = mime_type.unwrap_or_default();
+
+ Ok(Self {
+ image,
+ resolution,
+ has_mime_type,
+ mime_type,
+ })
+ }
+}
+
+impl Parse for Gradient {
+ fn parse<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ ) -> Result<Self, ParseError<'i>> {
+ enum Shape {
+ Linear,
+ Radial,
+ Conic,
+ }
+
+ let func = input.expect_function()?;
+ let (shape, repeating, compat_mode) = match_ignore_ascii_case! { &func,
+ "linear-gradient" => {
+ (Shape::Linear, false, GradientCompatMode::Modern)
+ },
+ "-webkit-linear-gradient" => {
+ (Shape::Linear, false, GradientCompatMode::WebKit)
+ },
+ #[cfg(feature = "gecko")]
+ "-moz-linear-gradient" => {
+ (Shape::Linear, false, GradientCompatMode::Moz)
+ },
+ "repeating-linear-gradient" => {
+ (Shape::Linear, true, GradientCompatMode::Modern)
+ },
+ "-webkit-repeating-linear-gradient" => {
+ (Shape::Linear, true, GradientCompatMode::WebKit)
+ },
+ #[cfg(feature = "gecko")]
+ "-moz-repeating-linear-gradient" => {
+ (Shape::Linear, true, GradientCompatMode::Moz)
+ },
+ "radial-gradient" => {
+ (Shape::Radial, false, GradientCompatMode::Modern)
+ },
+ "-webkit-radial-gradient" => {
+ (Shape::Radial, false, GradientCompatMode::WebKit)
+ },
+ #[cfg(feature = "gecko")]
+ "-moz-radial-gradient" => {
+ (Shape::Radial, false, GradientCompatMode::Moz)
+ },
+ "repeating-radial-gradient" => {
+ (Shape::Radial, true, GradientCompatMode::Modern)
+ },
+ "-webkit-repeating-radial-gradient" => {
+ (Shape::Radial, true, GradientCompatMode::WebKit)
+ },
+ #[cfg(feature = "gecko")]
+ "-moz-repeating-radial-gradient" => {
+ (Shape::Radial, true, GradientCompatMode::Moz)
+ },
+ "conic-gradient" => {
+ (Shape::Conic, false, GradientCompatMode::Modern)
+ },
+ "repeating-conic-gradient" => {
+ (Shape::Conic, true, GradientCompatMode::Modern)
+ },
+ "-webkit-gradient" => {
+ return input.parse_nested_block(|i| {
+ Self::parse_webkit_gradient_argument(context, i)
+ });
+ },
+ _ => {
+ let func = func.clone();
+ return Err(input.new_custom_error(StyleParseErrorKind::UnexpectedFunction(func)));
+ }
+ };
+
+ Ok(input.parse_nested_block(|i| {
+ Ok(match shape {
+ Shape::Linear => Self::parse_linear(context, i, repeating, compat_mode)?,
+ Shape::Radial => Self::parse_radial(context, i, repeating, compat_mode)?,
+ Shape::Conic => Self::parse_conic(context, i, repeating)?,
+ })
+ })?)
+ }
+}
+
+impl Gradient {
+ fn parse_webkit_gradient_argument<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ ) -> Result<Self, ParseError<'i>> {
+ use crate::values::specified::position::{
+ HorizontalPositionKeyword as X, VerticalPositionKeyword as Y,
+ };
+ type Point = GenericPosition<Component<X>, Component<Y>>;
+
+ #[derive(Clone, Copy, Parse)]
+ enum Component<S> {
+ Center,
+ Number(NumberOrPercentage),
+ Side(S),
+ }
+
+ impl LineDirection {
+ fn from_points(first: Point, second: Point) -> Self {
+ let h_ord = first.horizontal.partial_cmp(&second.horizontal);
+ let v_ord = first.vertical.partial_cmp(&second.vertical);
+ let (h, v) = match (h_ord, v_ord) {
+ (Some(h), Some(v)) => (h, v),
+ _ => return LineDirection::Vertical(Y::Bottom),
+ };
+ match (h, v) {
+ (Ordering::Less, Ordering::Less) => LineDirection::Corner(X::Right, Y::Bottom),
+ (Ordering::Less, Ordering::Equal) => LineDirection::Horizontal(X::Right),
+ (Ordering::Less, Ordering::Greater) => LineDirection::Corner(X::Right, Y::Top),
+ (Ordering::Equal, Ordering::Greater) => LineDirection::Vertical(Y::Top),
+ (Ordering::Equal, Ordering::Equal) | (Ordering::Equal, Ordering::Less) => {
+ LineDirection::Vertical(Y::Bottom)
+ },
+ (Ordering::Greater, Ordering::Less) => {
+ LineDirection::Corner(X::Left, Y::Bottom)
+ },
+ (Ordering::Greater, Ordering::Equal) => LineDirection::Horizontal(X::Left),
+ (Ordering::Greater, Ordering::Greater) => {
+ LineDirection::Corner(X::Left, Y::Top)
+ },
+ }
+ }
+ }
+
+ impl From<Point> for Position {
+ fn from(point: Point) -> Self {
+ Self::new(point.horizontal.into(), point.vertical.into())
+ }
+ }
+
+ impl Parse for Point {
+ fn parse<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ ) -> Result<Self, ParseError<'i>> {
+ input.try_parse(|i| {
+ let x = Component::parse(context, i)?;
+ let y = Component::parse(context, i)?;
+
+ Ok(Self::new(x, y))
+ })
+ }
+ }
+
+ impl<S: Side> From<Component<S>> for NumberOrPercentage {
+ fn from(component: Component<S>) -> Self {
+ match component {
+ Component::Center => NumberOrPercentage::Percentage(Percentage::new(0.5)),
+ Component::Number(number) => number,
+ Component::Side(side) => {
+ let p = if side.is_start() {
+ Percentage::zero()
+ } else {
+ Percentage::hundred()
+ };
+ NumberOrPercentage::Percentage(p)
+ },
+ }
+ }
+ }
+
+ impl<S: Side> From<Component<S>> for PositionComponent<S> {
+ fn from(component: Component<S>) -> Self {
+ match component {
+ Component::Center => PositionComponent::Center,
+ Component::Number(NumberOrPercentage::Number(number)) => {
+ PositionComponent::Length(Length::from_px(number.value).into())
+ },
+ Component::Number(NumberOrPercentage::Percentage(p)) => {
+ PositionComponent::Length(p.into())
+ },
+ Component::Side(side) => PositionComponent::Side(side, None),
+ }
+ }
+ }
+
+ impl<S: Copy + Side> Component<S> {
+ fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+ match (
+ NumberOrPercentage::from(*self),
+ NumberOrPercentage::from(*other),
+ ) {
+ (NumberOrPercentage::Percentage(a), NumberOrPercentage::Percentage(b)) => {
+ a.get().partial_cmp(&b.get())
+ },
+ (NumberOrPercentage::Number(a), NumberOrPercentage::Number(b)) => {
+ a.value.partial_cmp(&b.value)
+ },
+ (_, _) => None,
+ }
+ }
+ }
+
+ let ident = input.expect_ident_cloned()?;
+ input.expect_comma()?;
+
+ Ok(match_ignore_ascii_case! { &ident,
+ "linear" => {
+ let first = Point::parse(context, input)?;
+ input.expect_comma()?;
+ let second = Point::parse(context, input)?;
+
+ let direction = LineDirection::from_points(first, second);
+ let items = Gradient::parse_webkit_gradient_stops(context, input, false)?;
+
+ generic::Gradient::Linear {
+ direction,
+ items,
+ repeating: false,
+ compat_mode: GradientCompatMode::Modern,
+ }
+ },
+ "radial" => {
+ let first_point = Point::parse(context, input)?;
+ input.expect_comma()?;
+ let first_radius = Number::parse_non_negative(context, input)?;
+ input.expect_comma()?;
+ let second_point = Point::parse(context, input)?;
+ input.expect_comma()?;
+ let second_radius = Number::parse_non_negative(context, input)?;
+
+ let (reverse_stops, point, radius) = if second_radius.value >= first_radius.value {
+ (false, second_point, second_radius)
+ } else {
+ (true, first_point, first_radius)
+ };
+
+ let rad = Circle::Radius(NonNegative(Length::from_px(radius.value)));
+ let shape = generic::EndingShape::Circle(rad);
+ let position: Position = point.into();
+ let items = Gradient::parse_webkit_gradient_stops(context, input, reverse_stops)?;
+
+ generic::Gradient::Radial {
+ shape,
+ position,
+ items,
+ repeating: false,
+ compat_mode: GradientCompatMode::Modern,
+ }
+ },
+ _ => {
+ let e = SelectorParseErrorKind::UnexpectedIdent(ident.clone());
+ return Err(input.new_custom_error(e));
+ },
+ })
+ }
+
+ fn parse_webkit_gradient_stops<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ reverse_stops: bool,
+ ) -> Result<LengthPercentageItemList, ParseError<'i>> {
+ let mut items = input
+ .try_parse(|i| {
+ i.expect_comma()?;
+ i.parse_comma_separated(|i| {
+ let function = i.expect_function()?.clone();
+ let (color, mut p) = i.parse_nested_block(|i| {
+ let p = match_ignore_ascii_case! { &function,
+ "color-stop" => {
+ let p = NumberOrPercentage::parse(context, i)?.to_percentage();
+ i.expect_comma()?;
+ p
+ },
+ "from" => Percentage::zero(),
+ "to" => Percentage::hundred(),
+ _ => {
+ return Err(i.new_custom_error(
+ StyleParseErrorKind::UnexpectedFunction(function.clone())
+ ))
+ },
+ };
+ let color = Color::parse(context, i)?;
+ if color == Color::CurrentColor {
+ return Err(i.new_custom_error(StyleParseErrorKind::UnspecifiedError));
+ }
+ Ok((color.into(), p))
+ })?;
+ if reverse_stops {
+ p.reverse();
+ }
+ Ok(generic::GradientItem::ComplexColorStop {
+ color,
+ position: p.into(),
+ })
+ })
+ })
+ .unwrap_or(vec![]);
+
+ if items.is_empty() {
+ items = vec![
+ generic::GradientItem::ComplexColorStop {
+ color: Color::transparent(),
+ position: LengthPercentage::zero_percent(),
+ },
+ generic::GradientItem::ComplexColorStop {
+ color: Color::transparent(),
+ position: LengthPercentage::hundred_percent(),
+ },
+ ];
+ } else if items.len() == 1 {
+ let first = items[0].clone();
+ items.push(first);
+ } else {
+ items.sort_by(|a, b| {
+ match (a, b) {
+ (
+ &generic::GradientItem::ComplexColorStop {
+ position: ref a_position,
+ ..
+ },
+ &generic::GradientItem::ComplexColorStop {
+ position: ref b_position,
+ ..
+ },
+ ) => match (a_position, b_position) {
+ (&LengthPercentage::Percentage(a), &LengthPercentage::Percentage(b)) => {
+ return a.0.partial_cmp(&b.0).unwrap_or(Ordering::Equal);
+ },
+ _ => {},
+ },
+ _ => {},
+ }
+ if reverse_stops {
+ Ordering::Greater
+ } else {
+ Ordering::Less
+ }
+ })
+ }
+ Ok(items.into())
+ }
+
+ /// Not used for -webkit-gradient syntax and conic-gradient
+ fn parse_stops<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ ) -> Result<LengthPercentageItemList, ParseError<'i>> {
+ let items =
+ generic::GradientItem::parse_comma_separated(context, input, LengthPercentage::parse)?;
+ if items.len() < 2 {
+ return Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError));
+ }
+ Ok(items)
+ }
+
+ /// Parses a linear gradient.
+ /// GradientCompatMode can change during `-moz-` prefixed gradient parsing if it come across a `to` keyword.
+ fn parse_linear<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ repeating: bool,
+ mut compat_mode: GradientCompatMode,
+ ) -> Result<Self, ParseError<'i>> {
+ let direction = if let Ok(d) =
+ input.try_parse(|i| LineDirection::parse(context, i, &mut compat_mode))
+ {
+ input.expect_comma()?;
+ d
+ } else {
+ match compat_mode {
+ GradientCompatMode::Modern => {
+ LineDirection::Vertical(VerticalPositionKeyword::Bottom)
+ },
+ _ => LineDirection::Vertical(VerticalPositionKeyword::Top),
+ }
+ };
+ let items = Gradient::parse_stops(context, input)?;
+
+ Ok(Gradient::Linear {
+ direction,
+ items,
+ repeating,
+ compat_mode,
+ })
+ }
+
+ /// Parses a radial gradient.
+ fn parse_radial<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ repeating: bool,
+ compat_mode: GradientCompatMode,
+ ) -> Result<Self, ParseError<'i>> {
+ let (shape, position) = match compat_mode {
+ GradientCompatMode::Modern => {
+ let shape = input.try_parse(|i| EndingShape::parse(context, i, compat_mode));
+ let position = input.try_parse(|i| {
+ i.expect_ident_matching("at")?;
+ Position::parse(context, i)
+ });
+ (shape, position.ok())
+ },
+ _ => {
+ let position = input.try_parse(|i| Position::parse(context, i));
+ let shape = input.try_parse(|i| {
+ if position.is_ok() {
+ i.expect_comma()?;
+ }
+ EndingShape::parse(context, i, compat_mode)
+ });
+ (shape, position.ok())
+ },
+ };
+
+ if shape.is_ok() || position.is_some() {
+ input.expect_comma()?;
+ }
+
+ let shape = shape.unwrap_or({
+ generic::EndingShape::Ellipse(Ellipse::Extent(ShapeExtent::FarthestCorner))
+ });
+
+ let position = position.unwrap_or(Position::center());
+
+ let items = Gradient::parse_stops(context, input)?;
+
+ Ok(Gradient::Radial {
+ shape,
+ position,
+ items,
+ repeating,
+ compat_mode,
+ })
+ }
+ fn parse_conic<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ repeating: bool,
+ ) -> Result<Self, ParseError<'i>> {
+ let angle = input.try_parse(|i| {
+ i.expect_ident_matching("from")?;
+ // Spec allows unitless zero start angles
+ // https://drafts.csswg.org/css-images-4/#valdef-conic-gradient-angle
+ Angle::parse_with_unitless(context, i)
+ });
+ let position = input.try_parse(|i| {
+ i.expect_ident_matching("at")?;
+ Position::parse(context, i)
+ });
+ if angle.is_ok() || position.is_ok() {
+ input.expect_comma()?;
+ }
+
+ let angle = angle.unwrap_or(Angle::zero());
+ let position = position.unwrap_or(Position::center());
+ let items = generic::GradientItem::parse_comma_separated(
+ context,
+ input,
+ AngleOrPercentage::parse_with_unitless,
+ )?;
+
+ if items.len() < 2 {
+ return Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError));
+ }
+
+ Ok(Gradient::Conic {
+ angle,
+ position,
+ items,
+ repeating,
+ })
+ }
+}
+
+impl generic::LineDirection for LineDirection {
+ fn points_downwards(&self, compat_mode: GradientCompatMode) -> bool {
+ match *self {
+ LineDirection::Angle(ref angle) => angle.degrees() == 180.0,
+ LineDirection::Vertical(VerticalPositionKeyword::Bottom) => {
+ compat_mode == GradientCompatMode::Modern
+ },
+ LineDirection::Vertical(VerticalPositionKeyword::Top) => {
+ compat_mode != GradientCompatMode::Modern
+ },
+ _ => false,
+ }
+ }
+
+ fn to_css<W>(&self, dest: &mut CssWriter<W>, compat_mode: GradientCompatMode) -> fmt::Result
+ where
+ W: Write,
+ {
+ match *self {
+ LineDirection::Angle(angle) => angle.to_css(dest),
+ LineDirection::Horizontal(x) => {
+ if compat_mode == GradientCompatMode::Modern {
+ dest.write_str("to ")?;
+ }
+ x.to_css(dest)
+ },
+ LineDirection::Vertical(y) => {
+ if compat_mode == GradientCompatMode::Modern {
+ dest.write_str("to ")?;
+ }
+ y.to_css(dest)
+ },
+ LineDirection::Corner(x, y) => {
+ if compat_mode == GradientCompatMode::Modern {
+ dest.write_str("to ")?;
+ }
+ x.to_css(dest)?;
+ dest.write_str(" ")?;
+ y.to_css(dest)
+ },
+ }
+ }
+}
+
+impl LineDirection {
+ fn parse<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ compat_mode: &mut GradientCompatMode,
+ ) -> Result<Self, ParseError<'i>> {
+ // Gradients allow unitless zero angles as an exception, see:
+ // https://github.com/w3c/csswg-drafts/issues/1162
+ if let Ok(angle) = input.try_parse(|i| Angle::parse_with_unitless(context, i)) {
+ return Ok(LineDirection::Angle(angle));
+ }
+
+ input.try_parse(|i| {
+ let to_ident = i.try_parse(|i| i.expect_ident_matching("to"));
+ match *compat_mode {
+ // `to` keyword is mandatory in modern syntax.
+ GradientCompatMode::Modern => to_ident?,
+ // Fall back to Modern compatibility mode in case there is a `to` keyword.
+ // According to Gecko, `-moz-linear-gradient(to ...)` should serialize like
+ // `linear-gradient(to ...)`.
+ GradientCompatMode::Moz if to_ident.is_ok() => {
+ *compat_mode = GradientCompatMode::Modern
+ },
+ // There is no `to` keyword in webkit prefixed syntax. If it's consumed,
+ // parsing should throw an error.
+ GradientCompatMode::WebKit if to_ident.is_ok() => {
+ return Err(
+ i.new_custom_error(SelectorParseErrorKind::UnexpectedIdent("to".into()))
+ );
+ },
+ _ => {},
+ }
+
+ if let Ok(x) = i.try_parse(HorizontalPositionKeyword::parse) {
+ if let Ok(y) = i.try_parse(VerticalPositionKeyword::parse) {
+ return Ok(LineDirection::Corner(x, y));
+ }
+ return Ok(LineDirection::Horizontal(x));
+ }
+ let y = VerticalPositionKeyword::parse(i)?;
+ if let Ok(x) = i.try_parse(HorizontalPositionKeyword::parse) {
+ return Ok(LineDirection::Corner(x, y));
+ }
+ Ok(LineDirection::Vertical(y))
+ })
+ }
+}
+
+impl EndingShape {
+ fn parse<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ compat_mode: GradientCompatMode,
+ ) -> Result<Self, ParseError<'i>> {
+ if let Ok(extent) = input.try_parse(|i| ShapeExtent::parse_with_compat_mode(i, compat_mode))
+ {
+ if input
+ .try_parse(|i| i.expect_ident_matching("circle"))
+ .is_ok()
+ {
+ return Ok(generic::EndingShape::Circle(Circle::Extent(extent)));
+ }
+ let _ = input.try_parse(|i| i.expect_ident_matching("ellipse"));
+ return Ok(generic::EndingShape::Ellipse(Ellipse::Extent(extent)));
+ }
+ if input
+ .try_parse(|i| i.expect_ident_matching("circle"))
+ .is_ok()
+ {
+ if let Ok(extent) =
+ input.try_parse(|i| ShapeExtent::parse_with_compat_mode(i, compat_mode))
+ {
+ return Ok(generic::EndingShape::Circle(Circle::Extent(extent)));
+ }
+ if compat_mode == GradientCompatMode::Modern {
+ if let Ok(length) = input.try_parse(|i| NonNegativeLength::parse(context, i)) {
+ return Ok(generic::EndingShape::Circle(Circle::Radius(length)));
+ }
+ }
+ return Ok(generic::EndingShape::Circle(Circle::Extent(
+ ShapeExtent::FarthestCorner,
+ )));
+ }
+ if input
+ .try_parse(|i| i.expect_ident_matching("ellipse"))
+ .is_ok()
+ {
+ if let Ok(extent) =
+ input.try_parse(|i| ShapeExtent::parse_with_compat_mode(i, compat_mode))
+ {
+ return Ok(generic::EndingShape::Ellipse(Ellipse::Extent(extent)));
+ }
+ if compat_mode == GradientCompatMode::Modern {
+ let pair: Result<_, ParseError> = input.try_parse(|i| {
+ let x = NonNegativeLengthPercentage::parse(context, i)?;
+ let y = NonNegativeLengthPercentage::parse(context, i)?;
+ Ok((x, y))
+ });
+ if let Ok((x, y)) = pair {
+ return Ok(generic::EndingShape::Ellipse(Ellipse::Radii(x, y)));
+ }
+ }
+ return Ok(generic::EndingShape::Ellipse(Ellipse::Extent(
+ ShapeExtent::FarthestCorner,
+ )));
+ }
+ if let Ok(length) = input.try_parse(|i| NonNegativeLength::parse(context, i)) {
+ if let Ok(y) = input.try_parse(|i| NonNegativeLengthPercentage::parse(context, i)) {
+ if compat_mode == GradientCompatMode::Modern {
+ let _ = input.try_parse(|i| i.expect_ident_matching("ellipse"));
+ }
+ return Ok(generic::EndingShape::Ellipse(Ellipse::Radii(
+ NonNegative(LengthPercentage::from(length.0)),
+ y,
+ )));
+ }
+ if compat_mode == GradientCompatMode::Modern {
+ let y = input.try_parse(|i| {
+ i.expect_ident_matching("ellipse")?;
+ NonNegativeLengthPercentage::parse(context, i)
+ });
+ if let Ok(y) = y {
+ return Ok(generic::EndingShape::Ellipse(Ellipse::Radii(
+ NonNegative(LengthPercentage::from(length.0)),
+ y,
+ )));
+ }
+ let _ = input.try_parse(|i| i.expect_ident_matching("circle"));
+ }
+
+ return Ok(generic::EndingShape::Circle(Circle::Radius(length)));
+ }
+ input.try_parse(|i| {
+ let x = Percentage::parse_non_negative(context, i)?;
+ let y = if let Ok(y) = i.try_parse(|i| NonNegativeLengthPercentage::parse(context, i)) {
+ if compat_mode == GradientCompatMode::Modern {
+ let _ = i.try_parse(|i| i.expect_ident_matching("ellipse"));
+ }
+ y
+ } else {
+ if compat_mode == GradientCompatMode::Modern {
+ i.expect_ident_matching("ellipse")?;
+ }
+ NonNegativeLengthPercentage::parse(context, i)?
+ };
+ Ok(generic::EndingShape::Ellipse(Ellipse::Radii(
+ NonNegative(LengthPercentage::from(x)),
+ y,
+ )))
+ })
+ }
+}
+
+impl ShapeExtent {
+ fn parse_with_compat_mode<'i, 't>(
+ input: &mut Parser<'i, 't>,
+ compat_mode: GradientCompatMode,
+ ) -> Result<Self, ParseError<'i>> {
+ match Self::parse(input)? {
+ ShapeExtent::Contain | ShapeExtent::Cover
+ if compat_mode == GradientCompatMode::Modern =>
+ {
+ Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError))
+ },
+ ShapeExtent::Contain => Ok(ShapeExtent::ClosestSide),
+ ShapeExtent::Cover => Ok(ShapeExtent::FarthestCorner),
+ keyword => Ok(keyword),
+ }
+ }
+}
+
+impl<T> generic::GradientItem<Color, T> {
+ fn parse_comma_separated<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ parse_position: impl for<'i1, 't1> Fn(&ParserContext, &mut Parser<'i1, 't1>) -> Result<T, ParseError<'i1>>
+ + Copy,
+ ) -> Result<crate::OwnedSlice<Self>, ParseError<'i>> {
+ let mut items = Vec::new();
+ let mut seen_stop = false;
+
+ loop {
+ input.parse_until_before(Delimiter::Comma, |input| {
+ if seen_stop {
+ if let Ok(hint) = input.try_parse(|i| parse_position(context, i)) {
+ seen_stop = false;
+ items.push(generic::GradientItem::InterpolationHint(hint));
+ return Ok(());
+ }
+ }
+
+ let stop = generic::ColorStop::parse(context, input, parse_position)?;
+
+ if let Ok(multi_position) = input.try_parse(|i| parse_position(context, i)) {
+ let stop_color = stop.color.clone();
+ items.push(stop.into_item());
+ items.push(
+ generic::ColorStop {
+ color: stop_color,
+ position: Some(multi_position),
+ }
+ .into_item(),
+ );
+ } else {
+ items.push(stop.into_item());
+ }
+
+ seen_stop = true;
+ Ok(())
+ })?;
+
+ match input.next() {
+ Err(_) => break,
+ Ok(&Token::Comma) => continue,
+ Ok(_) => unreachable!(),
+ }
+ }
+
+ if !seen_stop || items.len() < 2 {
+ return Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError));
+ }
+ Ok(items.into())
+ }
+}
+
+impl<T> generic::ColorStop<Color, T> {
+ fn parse<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ parse_position: impl for<'i1, 't1> Fn(
+ &ParserContext,
+ &mut Parser<'i1, 't1>,
+ ) -> Result<T, ParseError<'i1>>,
+ ) -> Result<Self, ParseError<'i>> {
+ Ok(generic::ColorStop {
+ color: Color::parse(context, input)?,
+ position: input.try_parse(|i| parse_position(context, i)).ok(),
+ })
+ }
+}
+
+impl Parse for PaintWorklet {
+ fn parse<'i, 't>(
+ _context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ ) -> Result<Self, ParseError<'i>> {
+ input.expect_function_matching("paint")?;
+ input.parse_nested_block(|input| {
+ let name = Atom::from(&**input.expect_ident()?);
+ let arguments = input
+ .try_parse(|input| {
+ input.expect_comma()?;
+ input.parse_comma_separated(|input| SpecifiedValue::parse(input))
+ })
+ .unwrap_or(vec![]);
+ Ok(PaintWorklet { name, arguments })
+ })
+ }
+}
+
+impl MozImageRect {
+ #[cfg(feature = "gecko")]
+ fn parse<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ cors_mode: CorsMode,
+ ) -> Result<Self, ParseError<'i>> {
+ input.try_parse(|i| i.expect_function_matching("-moz-image-rect"))?;
+ input.parse_nested_block(|i| {
+ let string = i.expect_url_or_string()?;
+ let url = SpecifiedImageUrl::parse_from_string(
+ string.as_ref().to_owned(),
+ context,
+ cors_mode,
+ );
+ i.expect_comma()?;
+ let top = NumberOrPercentage::parse_non_negative(context, i)?;
+ i.expect_comma()?;
+ let right = NumberOrPercentage::parse_non_negative(context, i)?;
+ i.expect_comma()?;
+ let bottom = NumberOrPercentage::parse_non_negative(context, i)?;
+ i.expect_comma()?;
+ let left = NumberOrPercentage::parse_non_negative(context, i)?;
+ Ok(MozImageRect {
+ url,
+ top,
+ right,
+ bottom,
+ left,
+ })
+ })
+ }
+}
+
+/// https://drafts.csswg.org/css-images/#propdef-image-rendering
+#[allow(missing_docs)]
+#[derive(
+ Clone,
+ Copy,
+ Debug,
+ Eq,
+ Hash,
+ MallocSizeOf,
+ Parse,
+ PartialEq,
+ SpecifiedValueInfo,
+ ToCss,
+ ToComputedValue,
+ ToResolvedValue,
+ ToShmem,
+)]
+#[repr(u8)]
+pub enum ImageRendering {
+ Auto,
+ Smooth,
+ #[parse(aliases = "-moz-crisp-edges")]
+ CrispEdges,
+ Pixelated,
+ // From the spec:
+ //
+ // This property previously accepted the values optimizeSpeed and
+ // optimizeQuality. These are now deprecated; a user agent must accept
+ // them as valid values but must treat them as having the same behavior
+ // as crisp-edges and smooth respectively, and authors must not use
+ // them.
+ //
+ Optimizespeed,
+ Optimizequality,
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-02 08:47:19 +0000