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-rw-r--r--servo/components/style/values/specified/basic_shape.rs321
1 files changed, 321 insertions, 0 deletions
diff --git a/servo/components/style/values/specified/basic_shape.rs b/servo/components/style/values/specified/basic_shape.rs
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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
+//! [`basic-shape`][basic-shape]s
+//!
+//! [basic-shape]: https://drafts.csswg.org/css-shapes/#typedef-basic-shape
+
+use crate::parser::{Parse, ParserContext};
+use crate::values::generics::basic_shape as generic;
+use crate::values::generics::basic_shape::{Path, PolygonCoord};
+use crate::values::generics::rect::Rect;
+use crate::values::specified::border::BorderRadius;
+use crate::values::specified::image::Image;
+use crate::values::specified::position::{HorizontalPosition, Position, VerticalPosition};
+use crate::values::specified::url::SpecifiedUrl;
+use crate::values::specified::{LengthPercentage, NonNegativeLengthPercentage, SVGPathData};
+use crate::Zero;
+use cssparser::Parser;
+use style_traits::{ParseError, StyleParseErrorKind};
+
+/// A specified alias for FillRule.
+pub use crate::values::generics::basic_shape::FillRule;
+
+/// A specified `clip-path` value.
+pub type ClipPath = generic::GenericClipPath<BasicShape, SpecifiedUrl>;
+
+/// A specified `shape-outside` value.
+pub type ShapeOutside = generic::GenericShapeOutside<BasicShape, Image>;
+
+/// A specified basic shape.
+pub type BasicShape = generic::GenericBasicShape<
+ HorizontalPosition,
+ VerticalPosition,
+ LengthPercentage,
+ NonNegativeLengthPercentage,
+>;
+
+/// The specified value of `inset()`
+pub type InsetRect = generic::InsetRect<LengthPercentage, NonNegativeLengthPercentage>;
+
+/// A specified circle.
+pub type Circle =
+ generic::Circle<HorizontalPosition, VerticalPosition, NonNegativeLengthPercentage>;
+
+/// A specified ellipse.
+pub type Ellipse =
+ generic::Ellipse<HorizontalPosition, VerticalPosition, NonNegativeLengthPercentage>;
+
+/// The specified value of `ShapeRadius`
+pub type ShapeRadius = generic::ShapeRadius<NonNegativeLengthPercentage>;
+
+/// The specified value of `Polygon`
+pub type Polygon = generic::GenericPolygon<LengthPercentage>;
+
+/// A helper for both clip-path and shape-outside parsing of shapes.
+fn parse_shape_or_box<'i, 't, R, ReferenceBox>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ to_shape: impl FnOnce(Box<BasicShape>, ReferenceBox) -> R,
+ to_reference_box: impl FnOnce(ReferenceBox) -> R,
+) -> Result<R, ParseError<'i>>
+where
+ ReferenceBox: Default + Parse,
+{
+ fn parse_component<U: Parse>(
+ context: &ParserContext,
+ input: &mut Parser,
+ component: &mut Option<U>,
+ ) -> bool {
+ if component.is_some() {
+ return false; // already parsed this component
+ }
+
+ *component = input.try_parse(|i| U::parse(context, i)).ok();
+ component.is_some()
+ }
+
+ let mut shape = None;
+ let mut ref_box = None;
+
+ while parse_component(context, input, &mut shape) ||
+ parse_component(context, input, &mut ref_box)
+ {
+ //
+ }
+
+ if let Some(shp) = shape {
+ return Ok(to_shape(Box::new(shp), ref_box.unwrap_or_default()));
+ }
+
+ match ref_box {
+ Some(r) => Ok(to_reference_box(r)),
+ None => Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError)),
+ }
+}
+
+impl Parse for ClipPath {
+ #[inline]
+ fn parse<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ ) -> Result<Self, ParseError<'i>> {
+ if input.try_parse(|i| i.expect_ident_matching("none")).is_ok() {
+ return Ok(ClipPath::None);
+ }
+
+ if let Ok(p) = input.try_parse(|i| Path::parse(context, i)) {
+ return Ok(ClipPath::Path(p));
+ }
+
+ if let Ok(url) = input.try_parse(|i| SpecifiedUrl::parse(context, i)) {
+ return Ok(ClipPath::Url(url));
+ }
+
+ parse_shape_or_box(context, input, ClipPath::Shape, ClipPath::Box)
+ }
+}
+
+impl Parse for ShapeOutside {
+ #[inline]
+ fn parse<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ ) -> Result<Self, ParseError<'i>> {
+ // Need to parse this here so that `Image::parse_with_cors_anonymous`
+ // doesn't parse it.
+ if input.try_parse(|i| i.expect_ident_matching("none")).is_ok() {
+ return Ok(ShapeOutside::None);
+ }
+
+ if let Ok(image) = input.try_parse(|i| Image::parse_with_cors_anonymous(context, i)) {
+ debug_assert_ne!(image, Image::None);
+ return Ok(ShapeOutside::Image(image));
+ }
+
+ parse_shape_or_box(context, input, ShapeOutside::Shape, ShapeOutside::Box)
+ }
+}
+
+impl Parse for BasicShape {
+ fn parse<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ ) -> Result<Self, ParseError<'i>> {
+ let location = input.current_source_location();
+ let function = input.expect_function()?.clone();
+ input.parse_nested_block(move |i| {
+ (match_ignore_ascii_case! { &function,
+ "inset" => return InsetRect::parse_function_arguments(context, i).map(generic::BasicShape::Inset),
+ "circle" => return Circle::parse_function_arguments(context, i).map(generic::BasicShape::Circle),
+ "ellipse" => return Ellipse::parse_function_arguments(context, i).map(generic::BasicShape::Ellipse),
+ "polygon" => return Polygon::parse_function_arguments(context, i).map(generic::BasicShape::Polygon),
+ _ => Err(())
+ }).map_err(|()| {
+ location.new_custom_error(StyleParseErrorKind::UnexpectedFunction(function.clone()))
+ })
+ })
+ }
+}
+
+impl Parse for InsetRect {
+ fn parse<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ ) -> Result<Self, ParseError<'i>> {
+ input.expect_function_matching("inset")?;
+ input.parse_nested_block(|i| Self::parse_function_arguments(context, i))
+ }
+}
+
+impl InsetRect {
+ /// Parse the inner function arguments of `inset()`
+ fn parse_function_arguments<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ ) -> Result<Self, ParseError<'i>> {
+ let rect = Rect::parse_with(context, input, LengthPercentage::parse)?;
+ let round = if input
+ .try_parse(|i| i.expect_ident_matching("round"))
+ .is_ok()
+ {
+ BorderRadius::parse(context, input)?
+ } else {
+ BorderRadius::zero()
+ };
+ Ok(generic::InsetRect { rect, round })
+ }
+}
+
+impl Parse for Circle {
+ fn parse<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ ) -> Result<Self, ParseError<'i>> {
+ input.expect_function_matching("circle")?;
+ input.parse_nested_block(|i| Self::parse_function_arguments(context, i))
+ }
+}
+
+impl Circle {
+ fn parse_function_arguments<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ ) -> Result<Self, ParseError<'i>> {
+ let radius = input
+ .try_parse(|i| ShapeRadius::parse(context, i))
+ .unwrap_or_default();
+ let position = if input.try_parse(|i| i.expect_ident_matching("at")).is_ok() {
+ Position::parse(context, input)?
+ } else {
+ Position::center()
+ };
+
+ Ok(generic::Circle { radius, position })
+ }
+}
+
+impl Parse for Ellipse {
+ fn parse<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ ) -> Result<Self, ParseError<'i>> {
+ input.expect_function_matching("ellipse")?;
+ input.parse_nested_block(|i| Self::parse_function_arguments(context, i))
+ }
+}
+
+impl Ellipse {
+ fn parse_function_arguments<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ ) -> Result<Self, ParseError<'i>> {
+ let (a, b) = input
+ .try_parse(|i| -> Result<_, ParseError> {
+ Ok((
+ ShapeRadius::parse(context, i)?,
+ ShapeRadius::parse(context, i)?,
+ ))
+ })
+ .unwrap_or_default();
+ let position = if input.try_parse(|i| i.expect_ident_matching("at")).is_ok() {
+ Position::parse(context, input)?
+ } else {
+ Position::center()
+ };
+
+ Ok(generic::Ellipse {
+ semiaxis_x: a,
+ semiaxis_y: b,
+ position: position,
+ })
+ }
+}
+
+impl Parse for Polygon {
+ fn parse<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ ) -> Result<Self, ParseError<'i>> {
+ input.expect_function_matching("polygon")?;
+ input.parse_nested_block(|i| Self::parse_function_arguments(context, i))
+ }
+}
+
+impl Polygon {
+ /// Parse the inner arguments of a `polygon` function.
+ fn parse_function_arguments<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ ) -> Result<Self, ParseError<'i>> {
+ let fill = input
+ .try_parse(|i| -> Result<_, ParseError> {
+ let fill = FillRule::parse(i)?;
+ i.expect_comma()?; // only eat the comma if there is something before it
+ Ok(fill)
+ })
+ .unwrap_or_default();
+
+ let coordinates = input
+ .parse_comma_separated(|i| {
+ Ok(PolygonCoord(
+ LengthPercentage::parse(context, i)?,
+ LengthPercentage::parse(context, i)?,
+ ))
+ })?
+ .into();
+
+ Ok(Polygon { fill, coordinates })
+ }
+}
+
+impl Parse for Path {
+ fn parse<'i, 't>(
+ _context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ ) -> Result<Self, ParseError<'i>> {
+ input.expect_function_matching("path")?;
+ input.parse_nested_block(Self::parse_function_arguments)
+ }
+}
+
+impl Path {
+ /// Parse the inner arguments of a `path` function.
+ fn parse_function_arguments<'i, 't>(
+ input: &mut Parser<'i, 't>,
+ ) -> Result<Self, ParseError<'i>> {
+ use crate::values::specified::svg_path::AllowEmpty;
+
+ let fill = input
+ .try_parse(|i| -> Result<_, ParseError> {
+ let fill = FillRule::parse(i)?;
+ i.expect_comma()?;
+ Ok(fill)
+ })
+ .unwrap_or_default();
+ let path = SVGPathData::parse(input, AllowEmpty::No)?;
+ Ok(Path { fill, path })
+ }
+}
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