mirror of
https://github.com/servo/servo.git
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1221 lines
44 KiB
Rust
1221 lines
44 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 https://mozilla.org/MPL/2.0/. */
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//! CSS handling for the specified value of
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//! [`image`][image]s
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//!
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//! [image]: https://drafts.csswg.org/css-images/#image-values
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use crate::custom_properties::SpecifiedValue;
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use crate::parser::{Parse, ParserContext};
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use crate::stylesheets::CorsMode;
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use crate::values::generics::image::PaintWorklet;
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use crate::values::generics::image::{
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self as generic, Circle, Ellipse, GradientCompatMode, ShapeExtent,
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};
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use crate::values::generics::position::Position as GenericPosition;
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use crate::values::generics::NonNegative;
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use crate::values::specified::position::{HorizontalPositionKeyword, VerticalPositionKeyword};
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use crate::values::specified::position::{Position, PositionComponent, Side};
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use crate::values::specified::url::SpecifiedImageUrl;
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use crate::values::specified::{
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Angle, AngleOrPercentage, Color, Length, LengthPercentage, NonNegativeLength,
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NonNegativeLengthPercentage, Resolution,
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};
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use crate::values::specified::{Number, NumberOrPercentage, Percentage};
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use crate::Atom;
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use cssparser::{Delimiter, Parser, Token};
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use selectors::parser::SelectorParseErrorKind;
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#[cfg(feature = "servo")]
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use servo_url::ServoUrl;
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use std::cmp::Ordering;
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use std::fmt::{self, Write};
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use style_traits::{CssType, CssWriter, KeywordsCollectFn, ParseError};
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use style_traits::{SpecifiedValueInfo, StyleParseErrorKind, ToCss};
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/// Specified values for an image according to CSS-IMAGES.
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/// <https://drafts.csswg.org/css-images/#image-values>
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pub type Image =
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generic::Image<Gradient, MozImageRect, SpecifiedImageUrl, Color, Percentage, Resolution>;
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/// Specified values for a CSS gradient.
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/// <https://drafts.csswg.org/css-images/#gradients>
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pub type Gradient = generic::Gradient<
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LineDirection,
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LengthPercentage,
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NonNegativeLength,
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NonNegativeLengthPercentage,
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Position,
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Angle,
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AngleOrPercentage,
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Color,
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>;
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/// Specified values for CSS cross-fade
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/// cross-fade( CrossFadeElement, ...)
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/// <https://drafts.csswg.org/css-images-4/#cross-fade-function>
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pub type CrossFade = generic::CrossFade<Image, Color, Percentage>;
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/// CrossFadeElement = percent? CrossFadeImage
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pub type CrossFadeElement = generic::CrossFadeElement<Image, Color, Percentage>;
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/// CrossFadeImage = image | color
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pub type CrossFadeImage = generic::CrossFadeImage<Image, Color>;
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/// A specified percentage or nothing.
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pub type PercentOrNone = generic::PercentOrNone<Percentage>;
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/// `image-set()`
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pub type ImageSet = generic::ImageSet<Image, Resolution>;
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/// Each of the arguments to `image-set()`
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pub type ImageSetItem = generic::ImageSetItem<Image, Resolution>;
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type LengthPercentageItemList = crate::OwnedSlice<generic::GradientItem<Color, LengthPercentage>>;
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#[cfg(feature = "gecko")]
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fn cross_fade_enabled() -> bool {
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static_prefs::pref!("layout.css.cross-fade.enabled")
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}
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#[cfg(feature = "servo")]
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fn cross_fade_enabled() -> bool {
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false
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}
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#[cfg(feature = "gecko")]
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fn image_set_enabled() -> bool {
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static_prefs::pref!("layout.css.image-set.enabled")
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}
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#[cfg(feature = "servo")]
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fn image_set_enabled() -> bool {
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false
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}
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impl SpecifiedValueInfo for Gradient {
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const SUPPORTED_TYPES: u8 = CssType::GRADIENT;
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fn collect_completion_keywords(f: KeywordsCollectFn) {
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// This list here should keep sync with that in Gradient::parse.
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f(&[
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"linear-gradient",
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"-webkit-linear-gradient",
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"-moz-linear-gradient",
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"repeating-linear-gradient",
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"-webkit-repeating-linear-gradient",
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"-moz-repeating-linear-gradient",
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"radial-gradient",
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"-webkit-radial-gradient",
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"-moz-radial-gradient",
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"repeating-radial-gradient",
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"-webkit-repeating-radial-gradient",
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"-moz-repeating-radial-gradient",
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"-webkit-gradient",
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"conic-gradient",
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"repeating-conic-gradient",
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]);
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}
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}
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// Need to manually implement as whether or not cross-fade shows up in
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// completions & etc is dependent on it being enabled.
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impl<Image, Color, Percentage> SpecifiedValueInfo for generic::CrossFade<Image, Color, Percentage> {
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const SUPPORTED_TYPES: u8 = 0;
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fn collect_completion_keywords(f: KeywordsCollectFn) {
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if cross_fade_enabled() {
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f(&["cross-fade"]);
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}
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}
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}
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impl<Image, Resolution> SpecifiedValueInfo for generic::ImageSet<Image, Resolution> {
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const SUPPORTED_TYPES: u8 = 0;
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fn collect_completion_keywords(f: KeywordsCollectFn) {
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if image_set_enabled() {
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f(&["image-set"]);
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}
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}
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}
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/// A specified gradient line direction.
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///
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/// FIXME(emilio): This should be generic over Angle.
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#[derive(Clone, Debug, MallocSizeOf, PartialEq, ToShmem)]
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pub enum LineDirection {
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/// An angular direction.
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Angle(Angle),
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/// A horizontal direction.
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Horizontal(HorizontalPositionKeyword),
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/// A vertical direction.
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Vertical(VerticalPositionKeyword),
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/// A direction towards a corner of a box.
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Corner(HorizontalPositionKeyword, VerticalPositionKeyword),
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}
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/// A specified ending shape.
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pub type EndingShape = generic::EndingShape<NonNegativeLength, NonNegativeLengthPercentage>;
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/// Specified values for `moz-image-rect`
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/// -moz-image-rect(<uri>, top, right, bottom, left);
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#[cfg(all(feature = "gecko", not(feature = "cbindgen")))]
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pub type MozImageRect = generic::GenericMozImageRect<NumberOrPercentage, SpecifiedImageUrl>;
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#[cfg(not(feature = "gecko"))]
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#[derive(
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Clone,
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Debug,
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MallocSizeOf,
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PartialEq,
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SpecifiedValueInfo,
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ToComputedValue,
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ToCss,
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ToResolvedValue,
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ToShmem,
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)]
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/// Empty enum on non-Gecko
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pub enum MozImageRect {}
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impl Parse for Image {
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fn parse<'i, 't>(
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context: &ParserContext,
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input: &mut Parser<'i, 't>,
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) -> Result<Image, ParseError<'i>> {
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Image::parse_with_cors_mode(context, input, CorsMode::None, /* allow_none = */ true, /* only_url = */ false)
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}
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}
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impl Image {
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fn parse_with_cors_mode<'i, 't>(
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context: &ParserContext,
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input: &mut Parser<'i, 't>,
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cors_mode: CorsMode,
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allow_none: bool,
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only_url: bool,
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) -> Result<Image, ParseError<'i>> {
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if allow_none && input.try_parse(|i| i.expect_ident_matching("none")).is_ok() {
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return Ok(generic::Image::None);
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}
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if let Ok(url) = input
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.try_parse(|input| SpecifiedImageUrl::parse_with_cors_mode(context, input, cors_mode))
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{
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return Ok(generic::Image::Url(url));
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}
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if image_set_enabled() {
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if let Ok(is) = input.try_parse(|input| ImageSet::parse(context, input, cors_mode, only_url)) {
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return Ok(generic::Image::ImageSet(Box::new(is)));
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}
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}
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if only_url {
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return Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError));
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}
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if let Ok(gradient) = input.try_parse(|i| Gradient::parse(context, i)) {
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return Ok(generic::Image::Gradient(Box::new(gradient)));
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}
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if cross_fade_enabled() {
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if let Ok(cf) = input.try_parse(|input| CrossFade::parse(context, input, cors_mode)) {
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return Ok(generic::Image::CrossFade(Box::new(cf)));
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}
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}
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#[cfg(feature = "servo-layout-2013")]
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{
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if let Ok(paint_worklet) = input.try_parse(|i| PaintWorklet::parse(context, i)) {
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return Ok(generic::Image::PaintWorklet(paint_worklet));
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}
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}
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#[cfg(feature = "gecko")]
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{
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if let Ok(image_rect) =
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input.try_parse(|input| MozImageRect::parse(context, input, cors_mode))
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{
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return Ok(generic::Image::Rect(Box::new(image_rect)));
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}
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Ok(generic::Image::Element(Image::parse_element(input)?))
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}
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#[cfg(not(feature = "gecko"))]
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Err(input.new_error_for_next_token())
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}
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}
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impl Image {
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/// Creates an already specified image value from an already resolved URL
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/// for insertion in the cascade.
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#[cfg(feature = "servo")]
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pub fn for_cascade(url: ServoUrl) -> Self {
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use crate::values::CssUrl;
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generic::Image::Url(CssUrl::for_cascade(url))
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}
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/// Parses a `-moz-element(# <element-id>)`.
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#[cfg(feature = "gecko")]
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fn parse_element<'i, 't>(input: &mut Parser<'i, 't>) -> Result<Atom, ParseError<'i>> {
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input.try_parse(|i| i.expect_function_matching("-moz-element"))?;
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let location = input.current_source_location();
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input.parse_nested_block(|i| match *i.next()? {
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Token::IDHash(ref id) => Ok(Atom::from(id.as_ref())),
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ref t => Err(location.new_unexpected_token_error(t.clone())),
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})
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}
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/// Provides an alternate method for parsing that associates the URL with
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/// anonymous CORS headers.
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pub fn parse_with_cors_anonymous<'i, 't>(
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context: &ParserContext,
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input: &mut Parser<'i, 't>,
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) -> Result<Image, ParseError<'i>> {
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Self::parse_with_cors_mode(
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context,
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input,
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CorsMode::Anonymous,
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/* allow_none = */ true,
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/* only_url = */ false,
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)
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}
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/// Provides an alternate method for parsing, but only for urls.
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pub fn parse_only_url<'i, 't>(
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context: &ParserContext,
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input: &mut Parser<'i, 't>,
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) -> Result<Image, ParseError<'i>> {
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Self::parse_with_cors_mode(
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context,
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input,
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CorsMode::None,
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/* allow_none = */ false,
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/* only_url = */ true,
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)
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}
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}
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impl CrossFade {
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/// cross-fade() = cross-fade( <cf-image># )
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fn parse<'i, 't>(
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context: &ParserContext,
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input: &mut Parser<'i, 't>,
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cors_mode: CorsMode,
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) -> Result<Self, ParseError<'i>> {
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input.expect_function_matching("cross-fade")?;
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let elements = input.parse_nested_block(|input| {
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input.parse_comma_separated(|input| CrossFadeElement::parse(context, input, cors_mode))
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})?;
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let elements = crate::OwnedSlice::from(elements);
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Ok(Self { elements })
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}
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}
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impl CrossFadeElement {
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/// <cf-image> = <percentage>? && [ <image> | <color> ]
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fn parse<'i, 't>(
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context: &ParserContext,
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input: &mut Parser<'i, 't>,
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cors_mode: CorsMode,
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) -> Result<Self, ParseError<'i>> {
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// Try and parse a leading percent sign.
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let mut percent = PercentOrNone::parse_or_none(context, input);
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// Parse the image
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let image = CrossFadeImage::parse(context, input, cors_mode)?;
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// Try and parse a trailing percent sign.
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if percent == PercentOrNone::None {
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percent = PercentOrNone::parse_or_none(context, input);
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}
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Ok(Self { percent, image })
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}
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}
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impl CrossFadeImage {
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fn parse<'i, 't>(
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context: &ParserContext,
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input: &mut Parser<'i, 't>,
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cors_mode: CorsMode,
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) -> Result<Self, ParseError<'i>> {
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if let Ok(image) = input.try_parse(|input| {
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Image::parse_with_cors_mode(context, input, cors_mode, /* allow_none = */ false, /* only_url = */ false)
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}) {
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return Ok(Self::Image(image));
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}
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Ok(Self::Color(Color::parse(context, input)?))
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}
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}
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impl PercentOrNone {
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fn parse_or_none<'i, 't>(context: &ParserContext, input: &mut Parser<'i, 't>) -> Self {
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// We clamp our values here as this is the way that Safari and
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// Chrome's implementation handle out-of-bounds percentages
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// but whether or not this behavior follows the specification
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// is still being discussed. See:
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// <https://github.com/w3c/csswg-drafts/issues/5333>
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if let Ok(percent) = input.try_parse(|input| Percentage::parse_non_negative(context, input))
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{
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Self::Percent(percent.clamp_to_hundred())
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} else {
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Self::None
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}
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}
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}
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impl ImageSet {
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fn parse<'i, 't>(
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context: &ParserContext,
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input: &mut Parser<'i, 't>,
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cors_mode: CorsMode,
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only_url: bool,
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) -> Result<Self, ParseError<'i>> {
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input.expect_function_matching("image-set")?;
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let items = input.parse_nested_block(|input| {
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input.parse_comma_separated(|input| ImageSetItem::parse(context, input, cors_mode, only_url))
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})?;
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Ok(Self {
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selected_index: 0,
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items: items.into(),
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})
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}
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}
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impl ImageSetItem {
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fn parse_type<'i>(p: &mut Parser<'i, '_>) -> Result<crate::OwnedStr, ParseError<'i>> {
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p.expect_function_matching("type")?;
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p.parse_nested_block(|input| {
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Ok(input.expect_string()?.as_ref().to_owned().into())
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})
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}
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fn parse<'i, 't>(
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context: &ParserContext,
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input: &mut Parser<'i, 't>,
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cors_mode: CorsMode,
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only_url: bool,
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) -> Result<Self, ParseError<'i>> {
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let image = match input.try_parse(|i| i.expect_url_or_string()) {
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Ok(url) => Image::Url(SpecifiedImageUrl::parse_from_string(
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url.as_ref().into(),
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context,
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cors_mode,
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)),
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Err(..) => Image::parse_with_cors_mode(
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context, input, cors_mode, /* allow_none = */ false, /* only_url = */ only_url
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)?,
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};
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let mut resolution = input.try_parse(|input| Resolution::parse(context, input)).ok();
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let mime_type = input.try_parse(Self::parse_type).ok();
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// Try to parse resolution after type().
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if mime_type.is_some() && resolution.is_none() {
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resolution = input.try_parse(|input| Resolution::parse(context, input)).ok();
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}
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let resolution = resolution.unwrap_or(Resolution::X(1.0));
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let has_mime_type = mime_type.is_some();
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let mime_type = mime_type.unwrap_or_default();
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Ok(Self { image, resolution, has_mime_type, mime_type })
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}
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}
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impl Parse for Gradient {
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fn parse<'i, 't>(
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context: &ParserContext,
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input: &mut Parser<'i, 't>,
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) -> Result<Self, ParseError<'i>> {
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enum Shape {
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Linear,
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Radial,
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Conic,
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}
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let func = input.expect_function()?;
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let (shape, repeating, compat_mode) = match_ignore_ascii_case! { &func,
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"linear-gradient" => {
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(Shape::Linear, false, GradientCompatMode::Modern)
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},
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"-webkit-linear-gradient" => {
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(Shape::Linear, false, GradientCompatMode::WebKit)
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},
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#[cfg(feature = "gecko")]
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"-moz-linear-gradient" => {
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(Shape::Linear, false, GradientCompatMode::Moz)
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},
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"repeating-linear-gradient" => {
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(Shape::Linear, true, GradientCompatMode::Modern)
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},
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"-webkit-repeating-linear-gradient" => {
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(Shape::Linear, true, GradientCompatMode::WebKit)
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},
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#[cfg(feature = "gecko")]
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"-moz-repeating-linear-gradient" => {
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(Shape::Linear, true, GradientCompatMode::Moz)
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},
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"radial-gradient" => {
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(Shape::Radial, false, GradientCompatMode::Modern)
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},
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"-webkit-radial-gradient" => {
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(Shape::Radial, false, GradientCompatMode::WebKit)
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},
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#[cfg(feature = "gecko")]
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"-moz-radial-gradient" => {
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(Shape::Radial, false, GradientCompatMode::Moz)
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},
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"repeating-radial-gradient" => {
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(Shape::Radial, true, GradientCompatMode::Modern)
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},
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"-webkit-repeating-radial-gradient" => {
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(Shape::Radial, true, GradientCompatMode::WebKit)
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},
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#[cfg(feature = "gecko")]
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"-moz-repeating-radial-gradient" => {
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(Shape::Radial, true, GradientCompatMode::Moz)
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},
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"conic-gradient" => {
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(Shape::Conic, false, GradientCompatMode::Modern)
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},
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"repeating-conic-gradient" => {
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(Shape::Conic, true, GradientCompatMode::Modern)
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},
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"-webkit-gradient" => {
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return input.parse_nested_block(|i| {
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Self::parse_webkit_gradient_argument(context, i)
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});
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},
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_ => {
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let func = func.clone();
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return Err(input.new_custom_error(StyleParseErrorKind::UnexpectedFunction(func)));
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}
|
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};
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|
|
|
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().into(),
|
|
position: Percentage::zero().into(),
|
|
},
|
|
generic::GradientItem::ComplexColorStop {
|
|
color: Color::transparent().into(),
|
|
position: Percentage::hundred().into(),
|
|
},
|
|
];
|
|
} 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 cfg!(feature = "servo") || 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,
|
|
})
|
|
})
|
|
}
|
|
}
|