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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
+//! [`position`][position]s
+//!
+//! [position]: https://drafts.csswg.org/css-backgrounds-3/#position
+
+use crate::parser::{Parse, ParserContext};
+use crate::selector_map::PrecomputedHashMap;
+use crate::str::HTML_SPACE_CHARACTERS;
+use crate::values::computed::LengthPercentage as ComputedLengthPercentage;
+use crate::values::computed::{Context, Percentage, ToComputedValue};
+use crate::values::generics::position::AspectRatio as GenericAspectRatio;
+use crate::values::generics::position::Position as GenericPosition;
+use crate::values::generics::position::PositionComponent as GenericPositionComponent;
+use crate::values::generics::position::PositionOrAuto as GenericPositionOrAuto;
+use crate::values::generics::position::ZIndex as GenericZIndex;
+use crate::values::specified::{AllowQuirks, Integer, LengthPercentage, NonNegativeNumber};
+use crate::{Atom, Zero};
+use cssparser::Parser;
+use selectors::parser::SelectorParseErrorKind;
+use servo_arc::Arc;
+use std::fmt::{self, Write};
+use style_traits::values::specified::AllowedNumericType;
+use style_traits::{CssWriter, ParseError, StyleParseErrorKind, ToCss};
+
+/// The specified value of a CSS `<position>`
+pub type Position = GenericPosition<HorizontalPosition, VerticalPosition>;
+
+/// The specified value of an `auto | <position>`.
+pub type PositionOrAuto = GenericPositionOrAuto<Position>;
+
+/// The specified value of a horizontal position.
+pub type HorizontalPosition = PositionComponent<HorizontalPositionKeyword>;
+
+/// The specified value of a vertical position.
+pub type VerticalPosition = PositionComponent<VerticalPositionKeyword>;
+
+/// The specified value of a component of a CSS `<position>`.
+#[derive(Clone, Debug, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToCss, ToShmem)]
+pub enum PositionComponent<S> {
+ /// `center`
+ Center,
+ /// `<length-percentage>`
+ Length(LengthPercentage),
+ /// `<side> <length-percentage>?`
+ Side(S, Option<LengthPercentage>),
+}
+
+/// A keyword for the X direction.
+#[derive(
+ Clone,
+ Copy,
+ Debug,
+ Eq,
+ Hash,
+ MallocSizeOf,
+ Parse,
+ PartialEq,
+ SpecifiedValueInfo,
+ ToComputedValue,
+ ToCss,
+ ToResolvedValue,
+ ToShmem,
+)]
+#[allow(missing_docs)]
+#[repr(u8)]
+pub enum HorizontalPositionKeyword {
+ Left,
+ Right,
+}
+
+/// A keyword for the Y direction.
+#[derive(
+ Clone,
+ Copy,
+ Debug,
+ Eq,
+ Hash,
+ MallocSizeOf,
+ Parse,
+ PartialEq,
+ SpecifiedValueInfo,
+ ToComputedValue,
+ ToCss,
+ ToResolvedValue,
+ ToShmem,
+)]
+#[allow(missing_docs)]
+#[repr(u8)]
+pub enum VerticalPositionKeyword {
+ Top,
+ Bottom,
+}
+
+impl Parse for Position {
+ fn parse<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ ) -> Result<Self, ParseError<'i>> {
+ let position = Self::parse_three_value_quirky(context, input, AllowQuirks::No)?;
+ if position.is_three_value_syntax() {
+ return Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError));
+ }
+ Ok(position)
+ }
+}
+
+impl Position {
+ /// Parses a `<bg-position>`, with quirks.
+ pub fn parse_three_value_quirky<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ allow_quirks: AllowQuirks,
+ ) -> Result<Self, ParseError<'i>> {
+ match input.try_parse(|i| PositionComponent::parse_quirky(context, i, allow_quirks)) {
+ Ok(x_pos @ PositionComponent::Center) => {
+ if let Ok(y_pos) =
+ input.try_parse(|i| PositionComponent::parse_quirky(context, i, allow_quirks))
+ {
+ return Ok(Self::new(x_pos, y_pos));
+ }
+ let x_pos = input
+ .try_parse(|i| PositionComponent::parse_quirky(context, i, allow_quirks))
+ .unwrap_or(x_pos);
+ let y_pos = PositionComponent::Center;
+ return Ok(Self::new(x_pos, y_pos));
+ },
+ Ok(PositionComponent::Side(x_keyword, lp)) => {
+ if input
+ .try_parse(|i| i.expect_ident_matching("center"))
+ .is_ok()
+ {
+ let x_pos = PositionComponent::Side(x_keyword, lp);
+ let y_pos = PositionComponent::Center;
+ return Ok(Self::new(x_pos, y_pos));
+ }
+ if let Ok(y_keyword) = input.try_parse(VerticalPositionKeyword::parse) {
+ let y_lp = input
+ .try_parse(|i| LengthPercentage::parse_quirky(context, i, allow_quirks))
+ .ok();
+ let x_pos = PositionComponent::Side(x_keyword, lp);
+ let y_pos = PositionComponent::Side(y_keyword, y_lp);
+ return Ok(Self::new(x_pos, y_pos));
+ }
+ let x_pos = PositionComponent::Side(x_keyword, None);
+ let y_pos = lp.map_or(PositionComponent::Center, PositionComponent::Length);
+ return Ok(Self::new(x_pos, y_pos));
+ },
+ Ok(x_pos @ PositionComponent::Length(_)) => {
+ if let Ok(y_keyword) = input.try_parse(VerticalPositionKeyword::parse) {
+ let y_pos = PositionComponent::Side(y_keyword, None);
+ return Ok(Self::new(x_pos, y_pos));
+ }
+ if let Ok(y_lp) =
+ input.try_parse(|i| LengthPercentage::parse_quirky(context, i, allow_quirks))
+ {
+ let y_pos = PositionComponent::Length(y_lp);
+ return Ok(Self::new(x_pos, y_pos));
+ }
+ let y_pos = PositionComponent::Center;
+ let _ = input.try_parse(|i| i.expect_ident_matching("center"));
+ return Ok(Self::new(x_pos, y_pos));
+ },
+ Err(_) => {},
+ }
+ let y_keyword = VerticalPositionKeyword::parse(input)?;
+ let lp_and_x_pos: Result<_, ParseError> = input.try_parse(|i| {
+ let y_lp = i
+ .try_parse(|i| LengthPercentage::parse_quirky(context, i, allow_quirks))
+ .ok();
+ if let Ok(x_keyword) = i.try_parse(HorizontalPositionKeyword::parse) {
+ let x_lp = i
+ .try_parse(|i| LengthPercentage::parse_quirky(context, i, allow_quirks))
+ .ok();
+ let x_pos = PositionComponent::Side(x_keyword, x_lp);
+ return Ok((y_lp, x_pos));
+ };
+ i.expect_ident_matching("center")?;
+ let x_pos = PositionComponent::Center;
+ Ok((y_lp, x_pos))
+ });
+ if let Ok((y_lp, x_pos)) = lp_and_x_pos {
+ let y_pos = PositionComponent::Side(y_keyword, y_lp);
+ return Ok(Self::new(x_pos, y_pos));
+ }
+ let x_pos = PositionComponent::Center;
+ let y_pos = PositionComponent::Side(y_keyword, None);
+ Ok(Self::new(x_pos, y_pos))
+ }
+
+ /// `center center`
+ #[inline]
+ pub fn center() -> Self {
+ Self::new(PositionComponent::Center, PositionComponent::Center)
+ }
+
+ /// Returns true if this uses a 3 value syntax.
+ #[inline]
+ fn is_three_value_syntax(&self) -> bool {
+ self.horizontal.component_count() != self.vertical.component_count()
+ }
+}
+
+impl ToCss for Position {
+ fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
+ where
+ W: Write,
+ {
+ match (&self.horizontal, &self.vertical) {
+ (
+ x_pos @ &PositionComponent::Side(_, Some(_)),
+ &PositionComponent::Length(ref y_lp),
+ ) => {
+ x_pos.to_css(dest)?;
+ dest.write_str(" top ")?;
+ y_lp.to_css(dest)
+ },
+ (
+ &PositionComponent::Length(ref x_lp),
+ y_pos @ &PositionComponent::Side(_, Some(_)),
+ ) => {
+ dest.write_str("left ")?;
+ x_lp.to_css(dest)?;
+ dest.write_char(' ')?;
+ y_pos.to_css(dest)
+ },
+ (x_pos, y_pos) => {
+ x_pos.to_css(dest)?;
+ dest.write_char(' ')?;
+ y_pos.to_css(dest)
+ },
+ }
+ }
+}
+
+impl<S: Parse> Parse for PositionComponent<S> {
+ fn parse<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ ) -> Result<Self, ParseError<'i>> {
+ Self::parse_quirky(context, input, AllowQuirks::No)
+ }
+}
+
+impl<S: Parse> PositionComponent<S> {
+ /// Parses a component of a CSS position, with quirks.
+ pub fn parse_quirky<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ allow_quirks: AllowQuirks,
+ ) -> Result<Self, ParseError<'i>> {
+ if input
+ .try_parse(|i| i.expect_ident_matching("center"))
+ .is_ok()
+ {
+ return Ok(PositionComponent::Center);
+ }
+ if let Ok(lp) =
+ input.try_parse(|i| LengthPercentage::parse_quirky(context, i, allow_quirks))
+ {
+ return Ok(PositionComponent::Length(lp));
+ }
+ let keyword = S::parse(context, input)?;
+ let lp = input
+ .try_parse(|i| LengthPercentage::parse_quirky(context, i, allow_quirks))
+ .ok();
+ Ok(PositionComponent::Side(keyword, lp))
+ }
+}
+
+impl<S> GenericPositionComponent for PositionComponent<S> {
+ fn is_center(&self) -> bool {
+ match *self {
+ PositionComponent::Center => true,
+ PositionComponent::Length(LengthPercentage::Percentage(ref per)) => per.0 == 0.5,
+ // 50% from any side is still the center.
+ PositionComponent::Side(_, Some(LengthPercentage::Percentage(ref per))) => per.0 == 0.5,
+ _ => false,
+ }
+ }
+}
+
+impl<S> PositionComponent<S> {
+ /// `0%`
+ pub fn zero() -> Self {
+ PositionComponent::Length(LengthPercentage::Percentage(Percentage::zero()))
+ }
+
+ /// Returns the count of this component.
+ fn component_count(&self) -> usize {
+ match *self {
+ PositionComponent::Length(..) | PositionComponent::Center => 1,
+ PositionComponent::Side(_, ref lp) => {
+ if lp.is_some() {
+ 2
+ } else {
+ 1
+ }
+ },
+ }
+ }
+}
+
+impl<S: Side> ToComputedValue for PositionComponent<S> {
+ type ComputedValue = ComputedLengthPercentage;
+
+ fn to_computed_value(&self, context: &Context) -> Self::ComputedValue {
+ match *self {
+ PositionComponent::Center => ComputedLengthPercentage::new_percent(Percentage(0.5)),
+ PositionComponent::Side(ref keyword, None) => {
+ let p = Percentage(if keyword.is_start() { 0. } else { 1. });
+ ComputedLengthPercentage::new_percent(p)
+ },
+ PositionComponent::Side(ref keyword, Some(ref length)) if !keyword.is_start() => {
+ let length = length.to_computed_value(context);
+ // We represent `<end-side> <length>` as `calc(100% - <length>)`.
+ ComputedLengthPercentage::hundred_percent_minus(length, AllowedNumericType::All)
+ },
+ PositionComponent::Side(_, Some(ref length)) |
+ PositionComponent::Length(ref length) => length.to_computed_value(context),
+ }
+ }
+
+ fn from_computed_value(computed: &Self::ComputedValue) -> Self {
+ PositionComponent::Length(ToComputedValue::from_computed_value(computed))
+ }
+}
+
+impl<S: Side> PositionComponent<S> {
+ /// The initial specified value of a position component, i.e. the start side.
+ pub fn initial_specified_value() -> Self {
+ PositionComponent::Side(S::start(), None)
+ }
+}
+
+/// Represents a side, either horizontal or vertical, of a CSS position.
+pub trait Side {
+ /// Returns the start side.
+ fn start() -> Self;
+
+ /// Returns whether this side is the start side.
+ fn is_start(&self) -> bool;
+}
+
+impl Side for HorizontalPositionKeyword {
+ #[inline]
+ fn start() -> Self {
+ HorizontalPositionKeyword::Left
+ }
+
+ #[inline]
+ fn is_start(&self) -> bool {
+ *self == Self::start()
+ }
+}
+
+impl Side for VerticalPositionKeyword {
+ #[inline]
+ fn start() -> Self {
+ VerticalPositionKeyword::Top
+ }
+
+ #[inline]
+ fn is_start(&self) -> bool {
+ *self == Self::start()
+ }
+}
+
+bitflags! {
+ /// Controls how the auto-placement algorithm works specifying exactly how auto-placed items
+ /// get flowed into the grid.
+ #[derive(Clone, Copy, Eq, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToComputedValue, ToResolvedValue, ToShmem)]
+ #[value_info(other_values = "row,column,dense")]
+ #[repr(C)]
+ pub struct GridAutoFlow: u8 {
+ /// 'row' - mutually exclusive with 'column'
+ const ROW = 1 << 0;
+ /// 'column' - mutually exclusive with 'row'
+ const COLUMN = 1 << 1;
+ /// 'dense'
+ const DENSE = 1 << 2;
+ }
+}
+
+#[repr(u8)]
+#[derive(
+ Clone,
+ Copy,
+ Debug,
+ Eq,
+ MallocSizeOf,
+ PartialEq,
+ SpecifiedValueInfo,
+ ToComputedValue,
+ ToCss,
+ ToResolvedValue,
+ ToShmem,
+)]
+/// Masonry auto-placement algorithm packing.
+pub enum MasonryPlacement {
+ /// Place the item in the track(s) with the smallest extent so far.
+ Pack,
+ /// Place the item after the last item, from start to end.
+ Next,
+}
+
+#[repr(u8)]
+#[derive(
+ Clone,
+ Copy,
+ Debug,
+ Eq,
+ MallocSizeOf,
+ PartialEq,
+ SpecifiedValueInfo,
+ ToComputedValue,
+ ToCss,
+ ToResolvedValue,
+ ToShmem,
+)]
+/// Masonry auto-placement algorithm item sorting option.
+pub enum MasonryItemOrder {
+ /// Place all items with a definite placement before auto-placed items.
+ DefiniteFirst,
+ /// Place items in `order-modified document order`.
+ Ordered,
+}
+
+#[derive(
+ Clone,
+ Copy,
+ Debug,
+ Eq,
+ MallocSizeOf,
+ PartialEq,
+ SpecifiedValueInfo,
+ ToComputedValue,
+ ToCss,
+ ToResolvedValue,
+ ToShmem,
+)]
+#[repr(C)]
+/// Controls how the Masonry layout algorithm works
+/// specifying exactly how auto-placed items get flowed in the masonry axis.
+pub struct MasonryAutoFlow {
+ /// Specify how to pick a auto-placement track.
+ #[css(contextual_skip_if = "is_pack_with_non_default_order")]
+ pub placement: MasonryPlacement,
+ /// Specify how to pick an item to place.
+ #[css(skip_if = "is_item_order_definite_first")]
+ pub order: MasonryItemOrder,
+}
+
+#[inline]
+fn is_pack_with_non_default_order(placement: &MasonryPlacement, order: &MasonryItemOrder) -> bool {
+ *placement == MasonryPlacement::Pack && *order != MasonryItemOrder::DefiniteFirst
+}
+
+#[inline]
+fn is_item_order_definite_first(order: &MasonryItemOrder) -> bool {
+ *order == MasonryItemOrder::DefiniteFirst
+}
+
+impl MasonryAutoFlow {
+ #[inline]
+ /// Get initial `masonry-auto-flow` value.
+ pub fn initial() -> MasonryAutoFlow {
+ MasonryAutoFlow {
+ placement: MasonryPlacement::Pack,
+ order: MasonryItemOrder::DefiniteFirst,
+ }
+ }
+}
+
+impl Parse for MasonryAutoFlow {
+ /// [ definite-first | ordered ] || [ pack | next ]
+ fn parse<'i, 't>(
+ _context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ ) -> Result<MasonryAutoFlow, ParseError<'i>> {
+ let mut value = MasonryAutoFlow::initial();
+ let mut got_placement = false;
+ let mut got_order = false;
+ while !input.is_exhausted() {
+ let location = input.current_source_location();
+ let ident = input.expect_ident()?;
+ let success = match_ignore_ascii_case! { &ident,
+ "pack" if !got_placement => {
+ got_placement = true;
+ true
+ },
+ "next" if !got_placement => {
+ value.placement = MasonryPlacement::Next;
+ got_placement = true;
+ true
+ },
+ "definite-first" if !got_order => {
+ got_order = true;
+ true
+ },
+ "ordered" if !got_order => {
+ value.order = MasonryItemOrder::Ordered;
+ got_order = true;
+ true
+ },
+ _ => false
+ };
+ if !success {
+ return Err(location
+ .new_custom_error(SelectorParseErrorKind::UnexpectedIdent(ident.clone())));
+ }
+ }
+
+ if got_placement || got_order {
+ Ok(value)
+ } else {
+ Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError))
+ }
+ }
+}
+
+// TODO: Can be derived with some care.
+impl Parse for GridAutoFlow {
+ /// [ row | column ] || dense
+ fn parse<'i, 't>(
+ _context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ ) -> Result<GridAutoFlow, ParseError<'i>> {
+ let mut track = None;
+ let mut dense = GridAutoFlow::empty();
+
+ while !input.is_exhausted() {
+ let location = input.current_source_location();
+ let ident = input.expect_ident()?;
+ let success = match_ignore_ascii_case! { &ident,
+ "row" if track.is_none() => {
+ track = Some(GridAutoFlow::ROW);
+ true
+ },
+ "column" if track.is_none() => {
+ track = Some(GridAutoFlow::COLUMN);
+ true
+ },
+ "dense" if dense.is_empty() => {
+ dense = GridAutoFlow::DENSE;
+ true
+ },
+ _ => false,
+ };
+ if !success {
+ return Err(location
+ .new_custom_error(SelectorParseErrorKind::UnexpectedIdent(ident.clone())));
+ }
+ }
+
+ if track.is_some() || !dense.is_empty() {
+ Ok(track.unwrap_or(GridAutoFlow::ROW) | dense)
+ } else {
+ Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError))
+ }
+ }
+}
+
+impl ToCss for GridAutoFlow {
+ fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
+ where
+ W: Write,
+ {
+ if *self == GridAutoFlow::ROW {
+ return dest.write_str("row");
+ }
+
+ if *self == GridAutoFlow::COLUMN {
+ return dest.write_str("column");
+ }
+
+ if *self == GridAutoFlow::ROW | GridAutoFlow::DENSE {
+ return dest.write_str("dense");
+ }
+
+ if *self == GridAutoFlow::COLUMN | GridAutoFlow::DENSE {
+ return dest.write_str("column dense");
+ }
+
+ debug_assert!(false, "Unknown or invalid grid-autoflow value");
+ Ok(())
+ }
+}
+
+#[derive(
+ Clone,
+ Debug,
+ MallocSizeOf,
+ PartialEq,
+ SpecifiedValueInfo,
+ ToComputedValue,
+ ToCss,
+ ToResolvedValue,
+ ToShmem,
+)]
+#[repr(C)]
+/// https://drafts.csswg.org/css-grid/#named-grid-area
+pub struct TemplateAreas {
+ /// `named area` containing for each template area
+ #[css(skip)]
+ pub areas: crate::OwnedSlice<NamedArea>,
+ /// The original CSS string value of each template area
+ #[css(iterable)]
+ pub strings: crate::OwnedSlice<crate::OwnedStr>,
+ /// The number of columns of the grid.
+ #[css(skip)]
+ pub width: u32,
+}
+
+impl TemplateAreas {
+ /// Transform `vector` of str into `template area`
+ pub fn from_vec(strings: Vec<crate::OwnedStr>) -> Result<Self, ()> {
+ if strings.is_empty() {
+ return Err(());
+ }
+ let mut areas: Vec<NamedArea> = vec![];
+ let mut width = 0;
+ {
+ let mut row = 0u32;
+ let mut area_indices = PrecomputedHashMap::<Atom, usize>::default();
+ for string in &strings {
+ let mut current_area_index: Option<usize> = None;
+ row += 1;
+ let mut column = 0u32;
+ for token in TemplateAreasTokenizer(string) {
+ column += 1;
+ let name = if let Some(token) = token? {
+ Atom::from(token)
+ } else {
+ if let Some(index) = current_area_index.take() {
+ if areas[index].columns.end != column {
+ return Err(());
+ }
+ }
+ continue;
+ };
+ if let Some(index) = current_area_index {
+ if areas[index].name == name {
+ if areas[index].rows.start == row {
+ areas[index].columns.end += 1;
+ }
+ continue;
+ }
+ if areas[index].columns.end != column {
+ return Err(());
+ }
+ }
+ if let Some(index) = area_indices.get(&name).cloned() {
+ if areas[index].columns.start != column || areas[index].rows.end != row {
+ return Err(());
+ }
+ areas[index].rows.end += 1;
+ current_area_index = Some(index);
+ continue;
+ }
+ let index = areas.len();
+ assert!(area_indices.insert(name.clone(), index).is_none());
+ areas.push(NamedArea {
+ name,
+ columns: UnsignedRange {
+ start: column,
+ end: column + 1,
+ },
+ rows: UnsignedRange {
+ start: row,
+ end: row + 1,
+ },
+ });
+ current_area_index = Some(index);
+ }
+ if column == 0 {
+ // Each string must produce a valid token.
+ // https://github.com/w3c/csswg-drafts/issues/5110
+ return Err(());
+ }
+ if let Some(index) = current_area_index {
+ if areas[index].columns.end != column + 1 {
+ assert_ne!(areas[index].rows.start, row);
+ return Err(());
+ }
+ }
+ if row == 1 {
+ width = column;
+ } else if width != column {
+ return Err(());
+ }
+ }
+ }
+ Ok(TemplateAreas {
+ areas: areas.into(),
+ strings: strings.into(),
+ width,
+ })
+ }
+}
+
+impl Parse for TemplateAreas {
+ fn parse<'i, 't>(
+ _context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ ) -> Result<Self, ParseError<'i>> {
+ let mut strings = vec![];
+ while let Ok(string) =
+ input.try_parse(|i| i.expect_string().map(|s| s.as_ref().to_owned().into()))
+ {
+ strings.push(string);
+ }
+
+ TemplateAreas::from_vec(strings)
+ .map_err(|()| input.new_custom_error(StyleParseErrorKind::UnspecifiedError))
+ }
+}
+
+/// Arc type for `Arc<TemplateAreas>`
+#[derive(
+ Clone,
+ Debug,
+ MallocSizeOf,
+ PartialEq,
+ SpecifiedValueInfo,
+ ToComputedValue,
+ ToCss,
+ ToResolvedValue,
+ ToShmem,
+)]
+#[repr(transparent)]
+pub struct TemplateAreasArc(#[ignore_malloc_size_of = "Arc"] pub Arc<TemplateAreas>);
+
+impl Parse for TemplateAreasArc {
+ fn parse<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ ) -> Result<Self, ParseError<'i>> {
+ let parsed = TemplateAreas::parse(context, input)?;
+ Ok(TemplateAreasArc(Arc::new(parsed)))
+ }
+}
+
+/// A range of rows or columns. Using this instead of std::ops::Range for FFI
+/// purposes.
+#[repr(C)]
+#[derive(
+ Clone,
+ Debug,
+ MallocSizeOf,
+ PartialEq,
+ SpecifiedValueInfo,
+ ToComputedValue,
+ ToResolvedValue,
+ ToShmem,
+)]
+pub struct UnsignedRange {
+ /// The start of the range.
+ pub start: u32,
+ /// The end of the range.
+ pub end: u32,
+}
+
+#[derive(
+ Clone,
+ Debug,
+ MallocSizeOf,
+ PartialEq,
+ SpecifiedValueInfo,
+ ToComputedValue,
+ ToResolvedValue,
+ ToShmem,
+)]
+#[repr(C)]
+/// Not associated with any particular grid item, but can be referenced from the
+/// grid-placement properties.
+pub struct NamedArea {
+ /// Name of the `named area`
+ pub name: Atom,
+ /// Rows of the `named area`
+ pub rows: UnsignedRange,
+ /// Columns of the `named area`
+ pub columns: UnsignedRange,
+}
+
+/// Tokenize the string into a list of the tokens,
+/// using longest-match semantics
+struct TemplateAreasTokenizer<'a>(&'a str);
+
+impl<'a> Iterator for TemplateAreasTokenizer<'a> {
+ type Item = Result<Option<&'a str>, ()>;
+
+ fn next(&mut self) -> Option<Self::Item> {
+ let rest = self.0.trim_start_matches(HTML_SPACE_CHARACTERS);
+ if rest.is_empty() {
+ return None;
+ }
+ if rest.starts_with('.') {
+ self.0 = &rest[rest.find(|c| c != '.').unwrap_or(rest.len())..];
+ return Some(Ok(None));
+ }
+ if !rest.starts_with(is_name_code_point) {
+ return Some(Err(()));
+ }
+ let token_len = rest.find(|c| !is_name_code_point(c)).unwrap_or(rest.len());
+ let token = &rest[..token_len];
+ self.0 = &rest[token_len..];
+ Some(Ok(Some(token)))
+ }
+}
+
+fn is_name_code_point(c: char) -> bool {
+ c >= 'A' && c <= 'Z' ||
+ c >= 'a' && c <= 'z' ||
+ c >= '\u{80}' ||
+ c == '_' ||
+ c >= '0' && c <= '9' ||
+ c == '-'
+}
+
+/// This property specifies named grid areas.
+///
+/// The syntax of this property also provides a visualization of the structure
+/// of the grid, making the overall layout of the grid container easier to
+/// understand.
+#[repr(C, u8)]
+#[derive(
+ Clone,
+ Debug,
+ MallocSizeOf,
+ Parse,
+ PartialEq,
+ SpecifiedValueInfo,
+ ToComputedValue,
+ ToCss,
+ ToResolvedValue,
+ ToShmem,
+)]
+pub enum GridTemplateAreas {
+ /// The `none` value.
+ None,
+ /// The actual value.
+ Areas(TemplateAreasArc),
+}
+
+impl GridTemplateAreas {
+ #[inline]
+ /// Get default value as `none`
+ pub fn none() -> GridTemplateAreas {
+ GridTemplateAreas::None
+ }
+}
+
+/// A specified value for the `z-index` property.
+pub type ZIndex = GenericZIndex<Integer>;
+
+/// A specified value for the `aspect-ratio` property.
+pub type AspectRatio = GenericAspectRatio<NonNegativeNumber>;
+
+impl Parse for AspectRatio {
+ fn parse<'i, 't>(
+ context: &ParserContext,
+ input: &mut Parser<'i, 't>,
+ ) -> Result<Self, ParseError<'i>> {
+ use crate::values::generics::position::PreferredRatio;
+ use crate::values::specified::Ratio;
+
+ let location = input.current_source_location();
+ let mut auto = input.try_parse(|i| i.expect_ident_matching("auto"));
+ let ratio = input.try_parse(|i| Ratio::parse(context, i));
+ if auto.is_err() {
+ auto = input.try_parse(|i| i.expect_ident_matching("auto"));
+ }
+
+ if auto.is_err() && ratio.is_err() {
+ return Err(location.new_custom_error(StyleParseErrorKind::UnspecifiedError));
+ }
+
+ Ok(AspectRatio {
+ auto: auto.is_ok(),
+ ratio: match ratio {
+ Ok(ratio) => PreferredRatio::Ratio(ratio),
+ Err(..) => PreferredRatio::None,
+ },
+ })
+ }
+}
+
+impl AspectRatio {
+ /// Returns Self by a valid ratio.
+ pub fn from_mapped_ratio(w: f32, h: f32) -> Self {
+ use crate::values::generics::position::PreferredRatio;
+ use crate::values::generics::ratio::Ratio;
+ AspectRatio {
+ auto: true,
+ ratio: PreferredRatio::Ratio(Ratio(
+ NonNegativeNumber::new(w),
+ NonNegativeNumber::new(h),
+ )),
+ }
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-27 06:58:27 +0000