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Diffstat (limited to 'servo/components/style/values/specified/svg.rs')
| -rw-r--r-- | servo/components/style/values/specified/svg.rs | 391 |
1 files changed, 391 insertions, 0 deletions
diff --git a/servo/components/style/values/specified/svg.rs b/servo/components/style/values/specified/svg.rs new file mode 100644 index 0000000000..ccdef24e4e --- /dev/null +++ b/servo/components/style/values/specified/svg.rs @@ -0,0 +1,391 @@ +/* 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 SVG properties. + +use crate::parser::{Parse, ParserContext}; +use crate::values::generics::svg as generic; +use crate::values::specified::color::Color; +use crate::values::specified::url::SpecifiedUrl; +use crate::values::specified::AllowQuirks; +use crate::values::specified::LengthPercentage; +use crate::values::specified::SVGPathData; +use crate::values::specified::{NonNegativeLengthPercentage, Opacity}; +use crate::values::CustomIdent; +use cssparser::{Parser, Token}; +use std::fmt::{self, Write}; +use style_traits::{CommaWithSpace, CssWriter, ParseError, Separator}; +use style_traits::{StyleParseErrorKind, ToCss}; + +/// Specified SVG Paint value +pub type SVGPaint = generic::GenericSVGPaint<Color, SpecifiedUrl>; + +/// <length> | <percentage> | <number> | context-value +pub type SVGLength = generic::GenericSVGLength<LengthPercentage>; + +/// A non-negative version of SVGLength. +pub type SVGWidth = generic::GenericSVGLength<NonNegativeLengthPercentage>; + +/// [ <length> | <percentage> | <number> ]# | context-value +pub type SVGStrokeDashArray = generic::GenericSVGStrokeDashArray<NonNegativeLengthPercentage>; + +/// Whether the `context-value` value is enabled. +#[cfg(feature = "gecko")] +pub fn is_context_value_enabled() -> bool { + static_prefs::pref!("gfx.font_rendering.opentype_svg.enabled") +} + +/// Whether the `context-value` value is enabled. +#[cfg(not(feature = "gecko"))] +pub fn is_context_value_enabled() -> bool { + false +} + +macro_rules! parse_svg_length { + ($ty:ty, $lp:ty) => { + impl Parse for $ty { + fn parse<'i, 't>( + context: &ParserContext, + input: &mut Parser<'i, 't>, + ) -> Result<Self, ParseError<'i>> { + if let Ok(lp) = + input.try_parse(|i| <$lp>::parse_quirky(context, i, AllowQuirks::Always)) + { + return Ok(generic::SVGLength::LengthPercentage(lp)); + } + + try_match_ident_ignore_ascii_case! { input, + "context-value" if is_context_value_enabled() => { + Ok(generic::SVGLength::ContextValue) + }, + } + } + } + }; +} + +parse_svg_length!(SVGLength, LengthPercentage); +parse_svg_length!(SVGWidth, NonNegativeLengthPercentage); + +impl Parse for SVGStrokeDashArray { + fn parse<'i, 't>( + context: &ParserContext, + input: &mut Parser<'i, 't>, + ) -> Result<Self, ParseError<'i>> { + if let Ok(values) = input.try_parse(|i| { + CommaWithSpace::parse(i, |i| { + NonNegativeLengthPercentage::parse_quirky(context, i, AllowQuirks::Always) + }) + }) { + return Ok(generic::SVGStrokeDashArray::Values(values.into())); + } + + try_match_ident_ignore_ascii_case! { input, + "context-value" if is_context_value_enabled() => { + Ok(generic::SVGStrokeDashArray::ContextValue) + }, + "none" => Ok(generic::SVGStrokeDashArray::Values(Default::default())), + } + } +} + +/// <opacity-value> | context-fill-opacity | context-stroke-opacity +pub type SVGOpacity = generic::SVGOpacity<Opacity>; + +/// The specified value for a single CSS paint-order property. +#[repr(u8)] +#[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd, ToCss)] +pub enum PaintOrder { + /// `normal` variant + Normal = 0, + /// `fill` variant + Fill = 1, + /// `stroke` variant + Stroke = 2, + /// `markers` variant + Markers = 3, +} + +/// Number of non-normal components +pub const PAINT_ORDER_COUNT: u8 = 3; + +/// Number of bits for each component +pub const PAINT_ORDER_SHIFT: u8 = 2; + +/// Mask with above bits set +pub const PAINT_ORDER_MASK: u8 = 0b11; + +/// The specified value is tree `PaintOrder` values packed into the +/// bitfields below, as a six-bit field, of 3 two-bit pairs +/// +/// Each pair can be set to FILL, STROKE, or MARKERS +/// Lowest significant bit pairs are highest priority. +/// `normal` is the empty bitfield. The three pairs are +/// never zero in any case other than `normal`. +/// +/// Higher priority values, i.e. the values specified first, +/// will be painted first (and may be covered by paintings of lower priority) +#[derive( + Clone, + Copy, + Debug, + MallocSizeOf, + PartialEq, + SpecifiedValueInfo, + ToComputedValue, + ToResolvedValue, + ToShmem, +)] +#[repr(transparent)] +pub struct SVGPaintOrder(pub u8); + +impl SVGPaintOrder { + /// Get default `paint-order` with `0` + pub fn normal() -> Self { + SVGPaintOrder(0) + } + + /// Get variant of `paint-order` + pub fn order_at(&self, pos: u8) -> PaintOrder { + match (self.0 >> pos * PAINT_ORDER_SHIFT) & PAINT_ORDER_MASK { + 0 => PaintOrder::Normal, + 1 => PaintOrder::Fill, + 2 => PaintOrder::Stroke, + 3 => PaintOrder::Markers, + _ => unreachable!("this cannot happen"), + } + } +} + +impl Parse for SVGPaintOrder { + fn parse<'i, 't>( + _context: &ParserContext, + input: &mut Parser<'i, 't>, + ) -> Result<SVGPaintOrder, ParseError<'i>> { + if let Ok(()) = input.try_parse(|i| i.expect_ident_matching("normal")) { + return Ok(SVGPaintOrder::normal()); + } + + let mut value = 0; + // bitfield representing what we've seen so far + // bit 1 is fill, bit 2 is stroke, bit 3 is markers + let mut seen = 0; + let mut pos = 0; + + loop { + let result: Result<_, ParseError> = input.try_parse(|input| { + try_match_ident_ignore_ascii_case! { input, + "fill" => Ok(PaintOrder::Fill), + "stroke" => Ok(PaintOrder::Stroke), + "markers" => Ok(PaintOrder::Markers), + } + }); + + match result { + Ok(val) => { + if (seen & (1 << val as u8)) != 0 { + // don't parse the same ident twice + return Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError)); + } + + value |= (val as u8) << (pos * PAINT_ORDER_SHIFT); + seen |= 1 << (val as u8); + pos += 1; + }, + Err(_) => break, + } + } + + if value == 0 { + // Couldn't find any keyword + return Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError)); + } + + // fill in rest + for i in pos..PAINT_ORDER_COUNT { + for paint in 1..(PAINT_ORDER_COUNT + 1) { + // if not seen, set bit at position, mark as seen + if (seen & (1 << paint)) == 0 { + seen |= 1 << paint; + value |= paint << (i * PAINT_ORDER_SHIFT); + break; + } + } + } + + Ok(SVGPaintOrder(value)) + } +} + +impl ToCss for SVGPaintOrder { + fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result + where + W: Write, + { + if self.0 == 0 { + return dest.write_str("normal"); + } + + let mut last_pos_to_serialize = 0; + for i in (1..PAINT_ORDER_COUNT).rev() { + let component = self.order_at(i); + let earlier_component = self.order_at(i - 1); + if component < earlier_component { + last_pos_to_serialize = i - 1; + break; + } + } + + for pos in 0..last_pos_to_serialize + 1 { + if pos != 0 { + dest.write_char(' ')? + } + self.order_at(pos).to_css(dest)?; + } + Ok(()) + } +} + +bitflags! { + /// The context properties we understand. + #[derive(Clone, Copy, Eq, Default, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToComputedValue, ToResolvedValue, ToShmem)] + #[repr(C)] + pub struct ContextPropertyBits: u8 { + /// `fill` + const FILL = 1 << 0; + /// `stroke` + const STROKE = 1 << 1; + /// `fill-opacity` + const FILL_OPACITY = 1 << 2; + /// `stroke-opacity` + const STROKE_OPACITY = 1 << 3; + } +} + +/// Specified MozContextProperties value. +/// Nonstandard (https://developer.mozilla.org/en-US/docs/Web/CSS/-moz-context-properties) +#[derive( + Clone, + Debug, + Default, + MallocSizeOf, + PartialEq, + SpecifiedValueInfo, + ToComputedValue, + ToCss, + ToResolvedValue, + ToShmem, +)] +#[repr(C)] +pub struct MozContextProperties { + #[css(iterable, if_empty = "none")] + #[ignore_malloc_size_of = "Arc"] + idents: crate::ArcSlice<CustomIdent>, + #[css(skip)] + bits: ContextPropertyBits, +} + +impl Parse for MozContextProperties { + fn parse<'i, 't>( + _context: &ParserContext, + input: &mut Parser<'i, 't>, + ) -> Result<MozContextProperties, ParseError<'i>> { + let mut values = vec![]; + let mut bits = ContextPropertyBits::empty(); + loop { + { + let location = input.current_source_location(); + let ident = input.expect_ident()?; + + if ident.eq_ignore_ascii_case("none") && values.is_empty() { + return Ok(Self::default()); + } + + let ident = CustomIdent::from_ident(location, ident, &["all", "none", "auto"])?; + + if ident.0 == atom!("fill") { + bits.insert(ContextPropertyBits::FILL); + } else if ident.0 == atom!("stroke") { + bits.insert(ContextPropertyBits::STROKE); + } else if ident.0 == atom!("fill-opacity") { + bits.insert(ContextPropertyBits::FILL_OPACITY); + } else if ident.0 == atom!("stroke-opacity") { + bits.insert(ContextPropertyBits::STROKE_OPACITY); + } + + values.push(ident); + } + + let location = input.current_source_location(); + match input.next() { + Ok(&Token::Comma) => continue, + Err(..) => break, + Ok(other) => return Err(location.new_unexpected_token_error(other.clone())), + } + } + + if values.is_empty() { + return Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError)); + } + + Ok(MozContextProperties { + idents: crate::ArcSlice::from_iter(values.into_iter()), + bits, + }) + } +} + +/// The svg d property type. +/// +/// https://svgwg.org/svg2-draft/paths.html#TheDProperty +#[derive( + Animate, + Clone, + ComputeSquaredDistance, + Debug, + Deserialize, + MallocSizeOf, + PartialEq, + Serialize, + SpecifiedValueInfo, + ToAnimatedZero, + ToComputedValue, + ToCss, + ToResolvedValue, + ToShmem, +)] +#[repr(C, u8)] +pub enum DProperty { + /// Path value for path(<string>) or just a <string>. + #[css(function)] + Path(SVGPathData), + /// None value. + #[animation(error)] + None, +} + +impl DProperty { + /// return none. + #[inline] + pub fn none() -> Self { + DProperty::None + } +} + +impl Parse for DProperty { + fn parse<'i, 't>( + context: &ParserContext, + input: &mut Parser<'i, 't>, + ) -> Result<Self, ParseError<'i>> { + // Parse none. + if input.try_parse(|i| i.expect_ident_matching("none")).is_ok() { + return Ok(DProperty::none()); + } + + // Parse possible functions. + input.expect_function_matching("path")?; + let path_data = input.parse_nested_block(|i| Parse::parse(context, i))?; + Ok(DProperty::Path(path_data)) + } +} |