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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/. */
//! Specified types for CSS values that are related to motion path.
use crate::parser::{Parse, ParserContext};
use crate::values::computed::motion::OffsetRotate as ComputedOffsetRotate;
use crate::values::computed::{Context, ToComputedValue};
use crate::values::generics::motion::{
GenericOffsetPath, GenericOffsetPosition, RayFunction, RaySize,
};
use crate::values::specified::position::{HorizontalPosition, VerticalPosition};
use crate::values::specified::{Angle, SVGPathData};
use crate::Zero;
use cssparser::Parser;
use style_traits::{ParseError, StyleParseErrorKind};
/// The specified value of `offset-path`.
pub type OffsetPath = GenericOffsetPath<Angle>;
/// The specified value of `offset-position`.
pub type OffsetPosition = GenericOffsetPosition<HorizontalPosition, VerticalPosition>;
impl Parse for RayFunction<Angle> {
fn parse<'i, 't>(
context: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<Self, ParseError<'i>> {
if !static_prefs::pref!("layout.css.motion-path-ray.enabled") {
return Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError));
}
let mut angle = None;
let mut size = None;
let mut contain = false;
loop {
if angle.is_none() {
angle = input.try_parse(|i| Angle::parse(context, i)).ok();
}
if size.is_none() {
size = input.try_parse(RaySize::parse).ok();
if size.is_some() {
continue;
}
}
if !contain {
contain = input
.try_parse(|i| i.expect_ident_matching("contain"))
.is_ok();
if contain {
continue;
}
}
break;
}
if angle.is_none() {
return Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError));
}
Ok(RayFunction {
angle: angle.unwrap(),
// If no <ray-size> is specified it defaults to closest-side.
size: size.unwrap_or(RaySize::ClosestSide),
contain,
})
}
}
impl Parse for OffsetPath {
fn parse<'i, 't>(
context: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<Self, ParseError<'i>> {
use crate::values::specified::svg_path::AllowEmpty;
// Parse none.
if input.try_parse(|i| i.expect_ident_matching("none")).is_ok() {
return Ok(OffsetPath::none());
}
// Parse possible functions.
let location = input.current_source_location();
let function = input.expect_function()?.clone();
input.parse_nested_block(move |i| {
match_ignore_ascii_case! { &function,
// Bug 1186329: Implement the parser for <basic-shape>, <geometry-box>,
// and <url>.
"path" => SVGPathData::parse(i, AllowEmpty::No).map(OffsetPath::Path),
"ray" => RayFunction::parse(context, i).map(OffsetPath::Ray),
_ => {
Err(location.new_custom_error(
StyleParseErrorKind::UnexpectedFunction(function.clone())
))
},
}
})
}
}
/// The direction of offset-rotate.
#[derive(
Clone, Copy, Debug, MallocSizeOf, Parse, PartialEq, SpecifiedValueInfo, ToCss, ToShmem,
)]
#[repr(u8)]
pub enum OffsetRotateDirection {
/// Unspecified direction keyword.
#[css(skip)]
None,
/// 0deg offset (face forward).
Auto,
/// 180deg offset (face backward).
Reverse,
}
impl OffsetRotateDirection {
/// Returns true if it is none (i.e. the keyword is not specified).
#[inline]
fn is_none(&self) -> bool {
*self == OffsetRotateDirection::None
}
}
#[inline]
fn direction_specified_and_angle_is_zero(direction: &OffsetRotateDirection, angle: &Angle) -> bool {
!direction.is_none() && angle.is_zero()
}
/// The specified offset-rotate.
/// The syntax is: "[ auto | reverse ] || <angle>"
///
/// https://drafts.fxtf.org/motion-1/#offset-rotate-property
#[derive(Clone, Copy, Debug, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToCss, ToShmem)]
pub struct OffsetRotate {
/// [auto | reverse].
#[css(skip_if = "OffsetRotateDirection::is_none")]
direction: OffsetRotateDirection,
/// <angle>.
/// If direction is None, this is a fixed angle which indicates a
/// constant clockwise rotation transformation applied to it by this
/// specified rotation angle. Otherwise, the angle will be added to
/// the angle of the direction in layout.
#[css(contextual_skip_if = "direction_specified_and_angle_is_zero")]
angle: Angle,
}
impl OffsetRotate {
/// Returns the initial value, auto.
#[inline]
pub fn auto() -> Self {
OffsetRotate {
direction: OffsetRotateDirection::Auto,
angle: Angle::zero(),
}
}
/// Returns true if self is auto 0deg.
#[inline]
pub fn is_auto(&self) -> bool {
self.direction == OffsetRotateDirection::Auto && self.angle.is_zero()
}
}
impl Parse for OffsetRotate {
fn parse<'i, 't>(
context: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<Self, ParseError<'i>> {
let location = input.current_source_location();
let mut direction = input.try_parse(OffsetRotateDirection::parse);
let angle = input.try_parse(|i| Angle::parse(context, i));
if direction.is_err() {
// The direction and angle could be any order, so give it a change to parse
// direction again.
direction = input.try_parse(OffsetRotateDirection::parse);
}
if direction.is_err() && angle.is_err() {
return Err(location.new_custom_error(StyleParseErrorKind::UnspecifiedError));
}
Ok(OffsetRotate {
direction: direction.unwrap_or(OffsetRotateDirection::None),
angle: angle.unwrap_or(Zero::zero()),
})
}
}
impl ToComputedValue for OffsetRotate {
type ComputedValue = ComputedOffsetRotate;
#[inline]
fn to_computed_value(&self, context: &Context) -> Self::ComputedValue {
use crate::values::computed::Angle as ComputedAngle;
ComputedOffsetRotate {
auto: !self.direction.is_none(),
angle: if self.direction == OffsetRotateDirection::Reverse {
// The computed value should always convert "reverse" into "auto".
// e.g. "reverse calc(20deg + 10deg)" => "auto 210deg"
self.angle.to_computed_value(context) + ComputedAngle::from_degrees(180.0)
} else {
self.angle.to_computed_value(context)
},
}
}
#[inline]
fn from_computed_value(computed: &Self::ComputedValue) -> Self {
OffsetRotate {
direction: if computed.auto {
OffsetRotateDirection::Auto
} else {
OffsetRotateDirection::None
},
angle: ToComputedValue::from_computed_value(&computed.angle),
}
}
}
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