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Diffstat (limited to 'servo/components/style/values/specified/border.rs')
-rw-r--r-- | servo/components/style/values/specified/border.rs | 368 |
1 files changed, 368 insertions, 0 deletions
diff --git a/servo/components/style/values/specified/border.rs b/servo/components/style/values/specified/border.rs new file mode 100644 index 0000000000..c46050a5e2 --- /dev/null +++ b/servo/components/style/values/specified/border.rs @@ -0,0 +1,368 @@ +/* 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 related to borders. + +use crate::parser::{Parse, ParserContext}; +use crate::values::computed::{Context, ToComputedValue}; +use crate::values::generics::border::BorderCornerRadius as GenericBorderCornerRadius; +use crate::values::generics::border::BorderImageSideWidth as GenericBorderImageSideWidth; +use crate::values::generics::border::BorderImageSlice as GenericBorderImageSlice; +use crate::values::generics::border::BorderRadius as GenericBorderRadius; +use crate::values::generics::border::BorderSpacing as GenericBorderSpacing; +use crate::values::generics::rect::Rect; +use crate::values::generics::size::Size2D; +use crate::values::specified::length::{Length, NonNegativeLength, NonNegativeLengthPercentage}; +use crate::values::specified::{AllowQuirks, NonNegativeNumber, NonNegativeNumberOrPercentage}; +use crate::Zero; +use app_units::Au; +use cssparser::Parser; +use std::fmt::{self, Write}; +use style_traits::{CssWriter, ParseError, ToCss}; + +/// A specified value for a single side of a `border-style` property. +/// +/// The order here corresponds to the integer values from the border conflict +/// resolution rules in CSS 2.1 ยง 17.6.2.1. Higher values override lower values. +#[allow(missing_docs)] +#[cfg_attr(feature = "servo", derive(Deserialize, Serialize))] +#[derive( + Clone, + Copy, + Debug, + Eq, + FromPrimitive, + MallocSizeOf, + Ord, + Parse, + PartialEq, + PartialOrd, + SpecifiedValueInfo, + ToComputedValue, + ToCss, + ToResolvedValue, + ToShmem, +)] +#[repr(u8)] +pub enum BorderStyle { + Hidden, + None, + Inset, + Groove, + Outset, + Ridge, + Dotted, + Dashed, + Solid, + Double, +} + +impl BorderStyle { + /// Whether this border style is either none or hidden. + #[inline] + pub fn none_or_hidden(&self) -> bool { + matches!(*self, BorderStyle::None | BorderStyle::Hidden) + } +} + +/// A specified value for the `border-image-width` property. +pub type BorderImageWidth = Rect<BorderImageSideWidth>; + +/// A specified value for a single side of a `border-image-width` property. +pub type BorderImageSideWidth = + GenericBorderImageSideWidth<NonNegativeLengthPercentage, NonNegativeNumber>; + +/// A specified value for the `border-image-slice` property. +pub type BorderImageSlice = GenericBorderImageSlice<NonNegativeNumberOrPercentage>; + +/// A specified value for the `border-radius` property. +pub type BorderRadius = GenericBorderRadius<NonNegativeLengthPercentage>; + +/// A specified value for the `border-*-radius` longhand properties. +pub type BorderCornerRadius = GenericBorderCornerRadius<NonNegativeLengthPercentage>; + +/// A specified value for the `border-spacing` longhand properties. +pub type BorderSpacing = GenericBorderSpacing<NonNegativeLength>; + +impl BorderImageSlice { + /// Returns the `100%` value. + #[inline] + pub fn hundred_percent() -> Self { + GenericBorderImageSlice { + offsets: Rect::all(NonNegativeNumberOrPercentage::hundred_percent()), + fill: false, + } + } +} + +/// https://drafts.csswg.org/css-backgrounds-3/#typedef-line-width +#[derive(Clone, Debug, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToCss, ToShmem)] +pub enum LineWidth { + /// `thin` + Thin, + /// `medium` + Medium, + /// `thick` + Thick, + /// `<length>` + Length(NonNegativeLength), +} + +impl LineWidth { + /// Returns the `0px` value. + #[inline] + pub fn zero() -> Self { + Self::Length(NonNegativeLength::zero()) + } + + fn parse_quirky<'i, 't>( + context: &ParserContext, + input: &mut Parser<'i, 't>, + allow_quirks: AllowQuirks, + ) -> Result<Self, ParseError<'i>> { + if let Ok(length) = + input.try_parse(|i| NonNegativeLength::parse_quirky(context, i, allow_quirks)) + { + return Ok(Self::Length(length)); + } + Ok(try_match_ident_ignore_ascii_case! { input, + "thin" => Self::Thin, + "medium" => Self::Medium, + "thick" => Self::Thick, + }) + } +} + +impl Parse for LineWidth { + fn parse<'i>( + context: &ParserContext, + input: &mut Parser<'i, '_>, + ) -> Result<Self, ParseError<'i>> { + Self::parse_quirky(context, input, AllowQuirks::No) + } +} + +impl ToComputedValue for LineWidth { + type ComputedValue = app_units::Au; + + #[inline] + fn to_computed_value(&self, context: &Context) -> Self::ComputedValue { + match *self { + // https://drafts.csswg.org/css-backgrounds-3/#line-width + Self::Thin => Au::from_px(1), + Self::Medium => Au::from_px(3), + Self::Thick => Au::from_px(5), + Self::Length(ref length) => Au::from_f32_px(length.to_computed_value(context).px()), + } + } + + #[inline] + fn from_computed_value(computed: &Self::ComputedValue) -> Self { + Self::Length(NonNegativeLength::from_px(computed.to_f32_px())) + } +} + +/// A specified value for a single side of the `border-width` property. The difference between this +/// and LineWidth is whether we snap to device pixels or not. +#[derive(Clone, Debug, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToCss, ToShmem)] +pub struct BorderSideWidth(LineWidth); + +impl BorderSideWidth { + /// Returns the `medium` value. + pub fn medium() -> Self { + Self(LineWidth::Medium) + } + + /// Returns a bare px value from the argument. + pub fn from_px(px: f32) -> Self { + Self(LineWidth::Length(Length::from_px(px).into())) + } + + /// Parses, with quirks. + pub fn parse_quirky<'i, 't>( + context: &ParserContext, + input: &mut Parser<'i, 't>, + allow_quirks: AllowQuirks, + ) -> Result<Self, ParseError<'i>> { + Ok(Self(LineWidth::parse_quirky(context, input, allow_quirks)?)) + } +} + +impl Parse for BorderSideWidth { + fn parse<'i>( + context: &ParserContext, + input: &mut Parser<'i, '_>, + ) -> Result<Self, ParseError<'i>> { + Self::parse_quirky(context, input, AllowQuirks::No) + } +} + +impl ToComputedValue for BorderSideWidth { + type ComputedValue = app_units::Au; + + #[inline] + fn to_computed_value(&self, context: &Context) -> Self::ComputedValue { + let width = self.0.to_computed_value(context); + // Round `width` down to the nearest device pixel, but any non-zero value that would round + // down to zero is clamped to 1 device pixel. + if width == Au(0) { + return width; + } + + let au_per_dev_px = context.device().app_units_per_device_pixel(); + std::cmp::max( + Au(au_per_dev_px), + Au(width.0 / au_per_dev_px * au_per_dev_px), + ) + } + + #[inline] + fn from_computed_value(computed: &Self::ComputedValue) -> Self { + Self(LineWidth::from_computed_value(computed)) + } +} + +impl BorderImageSideWidth { + /// Returns `1`. + #[inline] + pub fn one() -> Self { + GenericBorderImageSideWidth::Number(NonNegativeNumber::new(1.)) + } +} + +impl Parse for BorderImageSlice { + fn parse<'i, 't>( + context: &ParserContext, + input: &mut Parser<'i, 't>, + ) -> Result<Self, ParseError<'i>> { + let mut fill = input.try_parse(|i| i.expect_ident_matching("fill")).is_ok(); + let offsets = Rect::parse_with(context, input, NonNegativeNumberOrPercentage::parse)?; + if !fill { + fill = input.try_parse(|i| i.expect_ident_matching("fill")).is_ok(); + } + Ok(GenericBorderImageSlice { offsets, fill }) + } +} + +impl Parse for BorderRadius { + fn parse<'i, 't>( + context: &ParserContext, + input: &mut Parser<'i, 't>, + ) -> Result<Self, ParseError<'i>> { + let widths = Rect::parse_with(context, input, NonNegativeLengthPercentage::parse)?; + let heights = if input.try_parse(|i| i.expect_delim('/')).is_ok() { + Rect::parse_with(context, input, NonNegativeLengthPercentage::parse)? + } else { + widths.clone() + }; + + Ok(GenericBorderRadius { + top_left: BorderCornerRadius::new(widths.0, heights.0), + top_right: BorderCornerRadius::new(widths.1, heights.1), + bottom_right: BorderCornerRadius::new(widths.2, heights.2), + bottom_left: BorderCornerRadius::new(widths.3, heights.3), + }) + } +} + +impl Parse for BorderCornerRadius { + fn parse<'i, 't>( + context: &ParserContext, + input: &mut Parser<'i, 't>, + ) -> Result<Self, ParseError<'i>> { + Size2D::parse_with(context, input, NonNegativeLengthPercentage::parse) + .map(GenericBorderCornerRadius) + } +} + +impl Parse for BorderSpacing { + fn parse<'i, 't>( + context: &ParserContext, + input: &mut Parser<'i, 't>, + ) -> Result<Self, ParseError<'i>> { + Size2D::parse_with(context, input, |context, input| { + NonNegativeLength::parse_quirky(context, input, AllowQuirks::Yes) + }) + .map(GenericBorderSpacing) + } +} + +/// A single border-image-repeat keyword. +#[allow(missing_docs)] +#[cfg_attr(feature = "servo", derive(Deserialize, Serialize))] +#[derive( + Clone, + Copy, + Debug, + Eq, + MallocSizeOf, + Parse, + PartialEq, + SpecifiedValueInfo, + ToComputedValue, + ToCss, + ToResolvedValue, + ToShmem, +)] +pub enum BorderImageRepeatKeyword { + Stretch, + Repeat, + Round, + Space, +} + +/// The specified value for the `border-image-repeat` property. +/// +/// https://drafts.csswg.org/css-backgrounds/#the-border-image-repeat +#[derive( + Clone, + Copy, + Debug, + MallocSizeOf, + PartialEq, + SpecifiedValueInfo, + ToComputedValue, + ToResolvedValue, + ToShmem, +)] +pub struct BorderImageRepeat(pub BorderImageRepeatKeyword, pub BorderImageRepeatKeyword); + +impl ToCss for BorderImageRepeat { + fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result + where + W: Write, + { + self.0.to_css(dest)?; + if self.0 != self.1 { + dest.write_char(' ')?; + self.1.to_css(dest)?; + } + Ok(()) + } +} + +impl BorderImageRepeat { + /// Returns the `stretch` value. + #[inline] + pub fn stretch() -> Self { + BorderImageRepeat( + BorderImageRepeatKeyword::Stretch, + BorderImageRepeatKeyword::Stretch, + ) + } +} + +impl Parse for BorderImageRepeat { + fn parse<'i, 't>( + _context: &ParserContext, + input: &mut Parser<'i, 't>, + ) -> Result<Self, ParseError<'i>> { + let horizontal = BorderImageRepeatKeyword::parse(input)?; + let vertical = input.try_parse(BorderImageRepeatKeyword::parse).ok(); + Ok(BorderImageRepeat( + horizontal, + vertical.unwrap_or(horizontal), + )) + } +} |