mirror of
https://github.com/servo/servo.git
synced 2025-10-04 02:29:12 +01:00
6785c57c78
This is a backport of https://phabricator.services.mozilla.com/D133101, by Jonathan Kew. Note that Servo isn't using font metrics yet, so the unit still won't really work.
1312 lines
46 KiB
Rust
1312 lines
46 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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//! [Length values][length].
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//!
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//! [length]: https://drafts.csswg.org/css-values/#lengths
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use super::{AllowQuirks, Number, Percentage, ToComputedValue};
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use crate::computed_value_flags::ComputedValueFlags;
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use crate::font_metrics::{FontMetrics, FontMetricsOrientation};
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use crate::parser::{Parse, ParserContext};
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use crate::values::computed::{self, CSSPixelLength, Context};
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use crate::values::generics::length as generics;
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use crate::values::generics::length::{
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GenericLengthOrNumber, GenericLengthPercentageOrNormal, GenericMaxSize, GenericSize,
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};
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use crate::values::generics::NonNegative;
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use crate::values::specified::calc::{self, CalcNode};
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use crate::values::specified::NonNegativeNumber;
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use crate::values::CSSFloat;
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use crate::Zero;
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use app_units::Au;
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use cssparser::{Parser, Token};
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use euclid::default::Size2D;
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use std::cmp;
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use std::ops::{Add, Mul};
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use style_traits::values::specified::AllowedNumericType;
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use style_traits::{ParseError, SpecifiedValueInfo, StyleParseErrorKind};
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pub use super::image::Image;
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pub use super::image::{EndingShape as GradientEndingShape, Gradient};
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pub use crate::values::specified::calc::CalcLengthPercentage;
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/// Number of pixels per inch
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pub const PX_PER_IN: CSSFloat = 96.;
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/// Number of pixels per centimeter
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pub const PX_PER_CM: CSSFloat = PX_PER_IN / 2.54;
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/// Number of pixels per millimeter
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pub const PX_PER_MM: CSSFloat = PX_PER_IN / 25.4;
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/// Number of pixels per quarter
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pub const PX_PER_Q: CSSFloat = PX_PER_MM / 4.;
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/// Number of pixels per point
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pub const PX_PER_PT: CSSFloat = PX_PER_IN / 72.;
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/// Number of pixels per pica
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pub const PX_PER_PC: CSSFloat = PX_PER_PT * 12.;
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/// A font relative length.
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#[derive(Clone, Copy, Debug, MallocSizeOf, PartialEq, ToCss, ToShmem)]
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pub enum FontRelativeLength {
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/// A "em" value: https://drafts.csswg.org/css-values/#em
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#[css(dimension)]
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Em(CSSFloat),
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/// A "ex" value: https://drafts.csswg.org/css-values/#ex
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#[css(dimension)]
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Ex(CSSFloat),
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/// A "ch" value: https://drafts.csswg.org/css-values/#ch
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#[css(dimension)]
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Ch(CSSFloat),
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/// A "cap" value: https://drafts.csswg.org/css-values/#cap
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#[css(dimension)]
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Cap(CSSFloat),
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/// A "rem" value: https://drafts.csswg.org/css-values/#rem
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#[css(dimension)]
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Rem(CSSFloat),
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}
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/// A source to resolve font-relative units against
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#[derive(Clone, Copy, Debug, PartialEq)]
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pub enum FontBaseSize {
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/// Use the font-size of the current element.
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CurrentStyle,
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/// Use the inherited font-size.
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InheritedStyle,
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}
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impl FontBaseSize {
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/// Calculate the actual size for a given context
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pub fn resolve(&self, context: &Context) -> computed::Length {
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match *self {
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FontBaseSize::CurrentStyle => context.style().get_font().clone_font_size().size(),
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FontBaseSize::InheritedStyle => {
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context.style().get_parent_font().clone_font_size().size()
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},
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}
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}
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}
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impl FontRelativeLength {
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/// Return true if this is a zero value.
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fn is_zero(&self) -> bool {
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match *self {
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FontRelativeLength::Em(v) |
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FontRelativeLength::Ex(v) |
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FontRelativeLength::Ch(v) |
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FontRelativeLength::Cap(v) |
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FontRelativeLength::Rem(v) => v == 0.,
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}
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}
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fn is_negative(&self) -> bool {
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match *self {
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FontRelativeLength::Em(v) |
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FontRelativeLength::Ex(v) |
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FontRelativeLength::Ch(v) |
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FontRelativeLength::Cap(v) |
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FontRelativeLength::Rem(v) => v < 0.,
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}
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}
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fn try_sum(&self, other: &Self) -> Result<Self, ()> {
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use self::FontRelativeLength::*;
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if std::mem::discriminant(self) != std::mem::discriminant(other) {
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return Err(());
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}
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Ok(match (self, other) {
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(&Em(one), &Em(other)) => Em(one + other),
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(&Ex(one), &Ex(other)) => Ex(one + other),
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(&Ch(one), &Ch(other)) => Ch(one + other),
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(&Cap(one), &Cap(other)) => Cap(one + other),
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(&Rem(one), &Rem(other)) => Rem(one + other),
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// See https://github.com/rust-lang/rust/issues/68867. rustc isn't
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// able to figure it own on its own so we help.
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_ => unsafe {
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match *self {
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Em(..) | Ex(..) | Ch(..) | Cap(..) | Rem(..) => {},
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}
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debug_unreachable!("Forgot to handle unit in try_sum()")
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},
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})
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}
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/// Computes the font-relative length.
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pub fn to_computed_value(
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&self,
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context: &Context,
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base_size: FontBaseSize,
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) -> computed::Length {
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let (reference_size, length) = self.reference_font_size_and_length(context, base_size);
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(reference_size * length).normalized()
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}
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/// Return reference font size.
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///
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/// We use the base_size flag to pass a different size for computing
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/// font-size and unconstrained font-size.
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///
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/// This returns a pair, the first one is the reference font size, and the
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/// second one is the unpacked relative length.
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fn reference_font_size_and_length(
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&self,
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context: &Context,
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base_size: FontBaseSize,
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) -> (computed::Length, CSSFloat) {
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fn query_font_metrics(
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context: &Context,
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base_size: FontBaseSize,
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orientation: FontMetricsOrientation,
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) -> FontMetrics {
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context
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.font_metrics_provider
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.query(context, base_size, orientation)
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}
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let reference_font_size = base_size.resolve(context);
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let font_metrics_flag = match base_size {
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FontBaseSize::CurrentStyle => ComputedValueFlags::DEPENDS_ON_SELF_FONT_METRICS,
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FontBaseSize::InheritedStyle => ComputedValueFlags::DEPENDS_ON_INHERITED_FONT_METRICS,
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};
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match *self {
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FontRelativeLength::Em(length) => {
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if context.for_non_inherited_property.is_some() {
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if base_size == FontBaseSize::CurrentStyle {
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context
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.rule_cache_conditions
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.borrow_mut()
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.set_font_size_dependency(reference_font_size.into());
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}
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}
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(reference_font_size, length)
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},
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FontRelativeLength::Ex(length) => {
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if context.for_non_inherited_property.is_some() {
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context.rule_cache_conditions.borrow_mut().set_uncacheable();
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}
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context.builder.add_flags(font_metrics_flag);
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// The x-height is an intrinsically horizontal metric.
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let metrics =
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query_font_metrics(context, base_size, FontMetricsOrientation::Horizontal);
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let reference_size = metrics.x_height.unwrap_or_else(|| {
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// https://drafts.csswg.org/css-values/#ex
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//
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// In the cases where it is impossible or impractical to
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// determine the x-height, a value of 0.5em must be
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// assumed.
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//
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reference_font_size * 0.5
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});
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(reference_size, length)
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},
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FontRelativeLength::Ch(length) => {
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if context.for_non_inherited_property.is_some() {
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context.rule_cache_conditions.borrow_mut().set_uncacheable();
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}
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context.builder.add_flags(font_metrics_flag);
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// https://drafts.csswg.org/css-values/#ch:
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//
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// Equal to the used advance measure of the “0” (ZERO,
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// U+0030) glyph in the font used to render it. (The advance
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// measure of a glyph is its advance width or height,
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// whichever is in the inline axis of the element.)
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//
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let metrics = query_font_metrics(
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context,
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base_size,
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FontMetricsOrientation::MatchContextPreferHorizontal,
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);
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let reference_size = metrics.zero_advance_measure.unwrap_or_else(|| {
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// https://drafts.csswg.org/css-values/#ch
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//
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// In the cases where it is impossible or impractical to
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// determine the measure of the “0” glyph, it must be
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// assumed to be 0.5em wide by 1em tall. Thus, the ch
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// unit falls back to 0.5em in the general case, and to
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// 1em when it would be typeset upright (i.e.
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// writing-mode is vertical-rl or vertical-lr and
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// text-orientation is upright).
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//
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let wm = context.style().writing_mode;
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if wm.is_vertical() && wm.is_upright() {
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reference_font_size
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} else {
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reference_font_size * 0.5
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}
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});
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(reference_size, length)
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},
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FontRelativeLength::Cap(length) => {
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if context.for_non_inherited_property.is_some() {
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context.rule_cache_conditions.borrow_mut().set_uncacheable();
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}
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context.builder.add_flags(font_metrics_flag);
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let metrics =
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query_font_metrics(context, base_size, FontMetricsOrientation::Horizontal);
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let reference_size = metrics.cap_height.unwrap_or_else(|| {
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// https://drafts.csswg.org/css-values/#cap
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//
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// In the cases where it is impossible or impractical to
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// determine the cap-height, the font’s ascent must be used.
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//
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metrics.ascent
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});
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(reference_size, length)
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},
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FontRelativeLength::Rem(length) => {
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// https://drafts.csswg.org/css-values/#rem:
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//
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// When specified on the font-size property of the root
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// element, the rem units refer to the property's initial
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// value.
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//
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let reference_size = if context.builder.is_root_element || context.in_media_query {
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reference_font_size
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} else {
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context.device().root_font_size()
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};
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(reference_size, length)
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},
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}
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}
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}
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/// A viewport-relative length.
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///
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/// <https://drafts.csswg.org/css-values/#viewport-relative-lengths>
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#[derive(Clone, Copy, Debug, MallocSizeOf, PartialEq, ToCss, ToShmem)]
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pub enum ViewportPercentageLength {
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/// A vw unit: https://drafts.csswg.org/css-values/#vw
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#[css(dimension)]
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Vw(CSSFloat),
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/// A vh unit: https://drafts.csswg.org/css-values/#vh
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#[css(dimension)]
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Vh(CSSFloat),
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/// <https://drafts.csswg.org/css-values/#vmin>
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#[css(dimension)]
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Vmin(CSSFloat),
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/// <https://drafts.csswg.org/css-values/#vmax>
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#[css(dimension)]
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Vmax(CSSFloat),
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}
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impl ViewportPercentageLength {
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/// Return true if this is a zero value.
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fn is_zero(&self) -> bool {
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match *self {
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ViewportPercentageLength::Vw(v) |
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ViewportPercentageLength::Vh(v) |
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ViewportPercentageLength::Vmin(v) |
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ViewportPercentageLength::Vmax(v) => v == 0.,
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}
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}
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fn is_negative(&self) -> bool {
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match *self {
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ViewportPercentageLength::Vw(v) |
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ViewportPercentageLength::Vh(v) |
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ViewportPercentageLength::Vmin(v) |
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ViewportPercentageLength::Vmax(v) => v < 0.,
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}
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}
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fn try_sum(&self, other: &Self) -> Result<Self, ()> {
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use self::ViewportPercentageLength::*;
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if std::mem::discriminant(self) != std::mem::discriminant(other) {
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return Err(());
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}
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Ok(match (self, other) {
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(&Vw(one), &Vw(other)) => Vw(one + other),
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(&Vh(one), &Vh(other)) => Vh(one + other),
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(&Vmin(one), &Vmin(other)) => Vmin(one + other),
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(&Vmax(one), &Vmax(other)) => Vmax(one + other),
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// See https://github.com/rust-lang/rust/issues/68867. rustc isn't
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// able to figure it own on its own so we help.
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_ => unsafe {
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match *self {
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Vw(..) | Vh(..) | Vmin(..) | Vmax(..) => {},
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}
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debug_unreachable!("Forgot to handle unit in try_sum()")
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},
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})
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}
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/// Computes the given viewport-relative length for the given viewport size.
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pub fn to_computed_value(&self, viewport_size: Size2D<Au>) -> CSSPixelLength {
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let (factor, length) = match *self {
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ViewportPercentageLength::Vw(length) => (length, viewport_size.width),
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ViewportPercentageLength::Vh(length) => (length, viewport_size.height),
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ViewportPercentageLength::Vmin(length) => {
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(length, cmp::min(viewport_size.width, viewport_size.height))
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},
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ViewportPercentageLength::Vmax(length) => {
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(length, cmp::max(viewport_size.width, viewport_size.height))
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},
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};
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// FIXME: Bug 1396535, we need to fix the extremely small viewport length for transform.
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// See bug 989802. We truncate so that adding multiple viewport units
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// that add up to 100 does not overflow due to rounding differences
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let trunc_scaled = ((length.0 as f64) * factor as f64 / 100.).trunc();
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Au::from_f64_au(trunc_scaled).into()
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}
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}
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/// HTML5 "character width", as defined in HTML5 § 14.5.4.
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#[derive(Clone, Copy, Debug, MallocSizeOf, PartialEq, ToCss, ToShmem)]
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pub struct CharacterWidth(pub i32);
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impl CharacterWidth {
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/// Computes the given character width.
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pub fn to_computed_value(&self, reference_font_size: computed::Length) -> computed::Length {
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// This applies the *converting a character width to pixels* algorithm
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// as specified in HTML5 § 14.5.4.
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//
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// TODO(pcwalton): Find these from the font.
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let average_advance = reference_font_size * 0.5;
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let max_advance = reference_font_size;
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average_advance * (self.0 as CSSFloat - 1.0) + max_advance
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}
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}
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/// Represents an absolute length with its unit
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#[derive(Clone, Copy, Debug, MallocSizeOf, PartialEq, ToCss, ToShmem)]
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pub enum AbsoluteLength {
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/// An absolute length in pixels (px)
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#[css(dimension)]
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Px(CSSFloat),
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/// An absolute length in inches (in)
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#[css(dimension)]
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In(CSSFloat),
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/// An absolute length in centimeters (cm)
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#[css(dimension)]
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Cm(CSSFloat),
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/// An absolute length in millimeters (mm)
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#[css(dimension)]
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Mm(CSSFloat),
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/// An absolute length in quarter-millimeters (q)
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#[css(dimension)]
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Q(CSSFloat),
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/// An absolute length in points (pt)
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#[css(dimension)]
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Pt(CSSFloat),
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/// An absolute length in pica (pc)
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#[css(dimension)]
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Pc(CSSFloat),
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}
|
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|
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impl AbsoluteLength {
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fn is_zero(&self) -> bool {
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match *self {
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AbsoluteLength::Px(v) |
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AbsoluteLength::In(v) |
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AbsoluteLength::Cm(v) |
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AbsoluteLength::Mm(v) |
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AbsoluteLength::Q(v) |
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AbsoluteLength::Pt(v) |
|
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AbsoluteLength::Pc(v) => v == 0.,
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}
|
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}
|
||
|
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fn is_negative(&self) -> bool {
|
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match *self {
|
||
AbsoluteLength::Px(v) |
|
||
AbsoluteLength::In(v) |
|
||
AbsoluteLength::Cm(v) |
|
||
AbsoluteLength::Mm(v) |
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||
AbsoluteLength::Q(v) |
|
||
AbsoluteLength::Pt(v) |
|
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AbsoluteLength::Pc(v) => v < 0.,
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}
|
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}
|
||
|
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/// Convert this into a pixel value.
|
||
#[inline]
|
||
pub fn to_px(&self) -> CSSFloat {
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use std::f32;
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||
|
||
let pixel = match *self {
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AbsoluteLength::Px(value) => value,
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AbsoluteLength::In(value) => value * PX_PER_IN,
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AbsoluteLength::Cm(value) => value * PX_PER_CM,
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AbsoluteLength::Mm(value) => value * PX_PER_MM,
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AbsoluteLength::Q(value) => value * PX_PER_Q,
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AbsoluteLength::Pt(value) => value * PX_PER_PT,
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AbsoluteLength::Pc(value) => value * PX_PER_PC,
|
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};
|
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pixel.min(f32::MAX).max(f32::MIN)
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}
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}
|
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|
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impl ToComputedValue for AbsoluteLength {
|
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type ComputedValue = CSSPixelLength;
|
||
|
||
fn to_computed_value(&self, _: &Context) -> Self::ComputedValue {
|
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CSSPixelLength::new(self.to_px())
|
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}
|
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|
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fn from_computed_value(computed: &Self::ComputedValue) -> Self {
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AbsoluteLength::Px(computed.px())
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}
|
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}
|
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|
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impl PartialOrd for AbsoluteLength {
|
||
fn partial_cmp(&self, other: &Self) -> Option<cmp::Ordering> {
|
||
self.to_px().partial_cmp(&other.to_px())
|
||
}
|
||
}
|
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|
||
impl Mul<CSSFloat> for AbsoluteLength {
|
||
type Output = AbsoluteLength;
|
||
|
||
#[inline]
|
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fn mul(self, scalar: CSSFloat) -> AbsoluteLength {
|
||
match self {
|
||
AbsoluteLength::Px(v) => AbsoluteLength::Px(v * scalar),
|
||
AbsoluteLength::In(v) => AbsoluteLength::In(v * scalar),
|
||
AbsoluteLength::Cm(v) => AbsoluteLength::Cm(v * scalar),
|
||
AbsoluteLength::Mm(v) => AbsoluteLength::Mm(v * scalar),
|
||
AbsoluteLength::Q(v) => AbsoluteLength::Q(v * scalar),
|
||
AbsoluteLength::Pt(v) => AbsoluteLength::Pt(v * scalar),
|
||
AbsoluteLength::Pc(v) => AbsoluteLength::Pc(v * scalar),
|
||
}
|
||
}
|
||
}
|
||
|
||
impl Add<AbsoluteLength> for AbsoluteLength {
|
||
type Output = Self;
|
||
|
||
#[inline]
|
||
fn add(self, rhs: Self) -> Self {
|
||
match (self, rhs) {
|
||
(AbsoluteLength::Px(x), AbsoluteLength::Px(y)) => AbsoluteLength::Px(x + y),
|
||
(AbsoluteLength::In(x), AbsoluteLength::In(y)) => AbsoluteLength::In(x + y),
|
||
(AbsoluteLength::Cm(x), AbsoluteLength::Cm(y)) => AbsoluteLength::Cm(x + y),
|
||
(AbsoluteLength::Mm(x), AbsoluteLength::Mm(y)) => AbsoluteLength::Mm(x + y),
|
||
(AbsoluteLength::Q(x), AbsoluteLength::Q(y)) => AbsoluteLength::Q(x + y),
|
||
(AbsoluteLength::Pt(x), AbsoluteLength::Pt(y)) => AbsoluteLength::Pt(x + y),
|
||
(AbsoluteLength::Pc(x), AbsoluteLength::Pc(y)) => AbsoluteLength::Pc(x + y),
|
||
_ => AbsoluteLength::Px(self.to_px() + rhs.to_px()),
|
||
}
|
||
}
|
||
}
|
||
|
||
/// A `<length>` without taking `calc` expressions into account
|
||
///
|
||
/// <https://drafts.csswg.org/css-values/#lengths>
|
||
#[derive(Clone, Copy, Debug, MallocSizeOf, PartialEq, ToCss, ToShmem)]
|
||
pub enum NoCalcLength {
|
||
/// An absolute length
|
||
///
|
||
/// <https://drafts.csswg.org/css-values/#absolute-length>
|
||
Absolute(AbsoluteLength),
|
||
|
||
/// A font-relative length:
|
||
///
|
||
/// <https://drafts.csswg.org/css-values/#font-relative-lengths>
|
||
FontRelative(FontRelativeLength),
|
||
|
||
/// A viewport-relative length.
|
||
///
|
||
/// <https://drafts.csswg.org/css-values/#viewport-relative-lengths>
|
||
ViewportPercentage(ViewportPercentageLength),
|
||
|
||
/// HTML5 "character width", as defined in HTML5 § 14.5.4.
|
||
///
|
||
/// This cannot be specified by the user directly and is only generated by
|
||
/// `Stylist::synthesize_rules_for_legacy_attributes()`.
|
||
#[css(function)]
|
||
ServoCharacterWidth(CharacterWidth),
|
||
}
|
||
|
||
impl Mul<CSSFloat> for NoCalcLength {
|
||
type Output = NoCalcLength;
|
||
|
||
#[inline]
|
||
fn mul(self, scalar: CSSFloat) -> NoCalcLength {
|
||
match self {
|
||
NoCalcLength::Absolute(v) => NoCalcLength::Absolute(v * scalar),
|
||
NoCalcLength::FontRelative(v) => NoCalcLength::FontRelative(v * scalar),
|
||
NoCalcLength::ViewportPercentage(v) => NoCalcLength::ViewportPercentage(v * scalar),
|
||
NoCalcLength::ServoCharacterWidth(_) => panic!("Can't multiply ServoCharacterWidth!"),
|
||
}
|
||
}
|
||
}
|
||
|
||
impl NoCalcLength {
|
||
/// Returns whether the value of this length without unit is less than zero.
|
||
pub fn is_negative(&self) -> bool {
|
||
match *self {
|
||
NoCalcLength::Absolute(v) => v.is_negative(),
|
||
NoCalcLength::FontRelative(v) => v.is_negative(),
|
||
NoCalcLength::ViewportPercentage(v) => v.is_negative(),
|
||
NoCalcLength::ServoCharacterWidth(c) => c.0 < 0,
|
||
}
|
||
}
|
||
|
||
/// Parse a given absolute or relative dimension.
|
||
pub fn parse_dimension(
|
||
context: &ParserContext,
|
||
value: CSSFloat,
|
||
unit: &str,
|
||
) -> Result<Self, ()> {
|
||
Ok(match_ignore_ascii_case! { unit,
|
||
"px" => NoCalcLength::Absolute(AbsoluteLength::Px(value)),
|
||
"in" => NoCalcLength::Absolute(AbsoluteLength::In(value)),
|
||
"cm" => NoCalcLength::Absolute(AbsoluteLength::Cm(value)),
|
||
"mm" => NoCalcLength::Absolute(AbsoluteLength::Mm(value)),
|
||
"q" => NoCalcLength::Absolute(AbsoluteLength::Q(value)),
|
||
"pt" => NoCalcLength::Absolute(AbsoluteLength::Pt(value)),
|
||
"pc" => NoCalcLength::Absolute(AbsoluteLength::Pc(value)),
|
||
// font-relative
|
||
"em" => NoCalcLength::FontRelative(FontRelativeLength::Em(value)),
|
||
"ex" => NoCalcLength::FontRelative(FontRelativeLength::Ex(value)),
|
||
"ch" => NoCalcLength::FontRelative(FontRelativeLength::Ch(value)),
|
||
"cap" => NoCalcLength::FontRelative(FontRelativeLength::Cap(value)),
|
||
"rem" => NoCalcLength::FontRelative(FontRelativeLength::Rem(value)),
|
||
// viewport percentages
|
||
"vw" if !context.in_page_rule() => {
|
||
NoCalcLength::ViewportPercentage(ViewportPercentageLength::Vw(value))
|
||
},
|
||
"vh" if !context.in_page_rule() => {
|
||
NoCalcLength::ViewportPercentage(ViewportPercentageLength::Vh(value))
|
||
},
|
||
"vmin" if !context.in_page_rule() => {
|
||
NoCalcLength::ViewportPercentage(ViewportPercentageLength::Vmin(value))
|
||
},
|
||
"vmax" if !context.in_page_rule() => {
|
||
NoCalcLength::ViewportPercentage(ViewportPercentageLength::Vmax(value))
|
||
},
|
||
_ => return Err(()),
|
||
})
|
||
}
|
||
|
||
/// Try to sume two lengths if compatible into the left hand side.
|
||
pub(crate) fn try_sum(&self, other: &Self) -> Result<Self, ()> {
|
||
use self::NoCalcLength::*;
|
||
|
||
if std::mem::discriminant(self) != std::mem::discriminant(other) {
|
||
return Err(());
|
||
}
|
||
|
||
Ok(match (self, other) {
|
||
(&Absolute(ref one), &Absolute(ref other)) => Absolute(*one + *other),
|
||
(&FontRelative(ref one), &FontRelative(ref other)) => FontRelative(one.try_sum(other)?),
|
||
(&ViewportPercentage(ref one), &ViewportPercentage(ref other)) => {
|
||
ViewportPercentage(one.try_sum(other)?)
|
||
},
|
||
(&ServoCharacterWidth(ref one), &ServoCharacterWidth(ref other)) => {
|
||
ServoCharacterWidth(CharacterWidth(one.0 + other.0))
|
||
},
|
||
// See https://github.com/rust-lang/rust/issues/68867. rustc isn't
|
||
// able to figure it own on its own so we help.
|
||
_ => unsafe {
|
||
match *self {
|
||
Absolute(..) |
|
||
FontRelative(..) |
|
||
ViewportPercentage(..) |
|
||
ServoCharacterWidth(..) => {},
|
||
}
|
||
debug_unreachable!("Forgot to handle unit in try_sum()")
|
||
},
|
||
})
|
||
}
|
||
|
||
/// Get a px value without context.
|
||
#[inline]
|
||
pub fn to_computed_pixel_length_without_context(&self) -> Result<CSSFloat, ()> {
|
||
match *self {
|
||
NoCalcLength::Absolute(len) => Ok(len.to_px()),
|
||
_ => Err(()),
|
||
}
|
||
}
|
||
|
||
/// Get an absolute length from a px value.
|
||
#[inline]
|
||
pub fn from_px(px_value: CSSFloat) -> NoCalcLength {
|
||
NoCalcLength::Absolute(AbsoluteLength::Px(px_value))
|
||
}
|
||
}
|
||
|
||
impl SpecifiedValueInfo for NoCalcLength {}
|
||
|
||
impl PartialOrd for NoCalcLength {
|
||
fn partial_cmp(&self, other: &Self) -> Option<cmp::Ordering> {
|
||
use self::NoCalcLength::*;
|
||
|
||
if std::mem::discriminant(self) != std::mem::discriminant(other) {
|
||
return None;
|
||
}
|
||
|
||
match (self, other) {
|
||
(&Absolute(ref one), &Absolute(ref other)) => one.to_px().partial_cmp(&other.to_px()),
|
||
(&FontRelative(ref one), &FontRelative(ref other)) => one.partial_cmp(other),
|
||
(&ViewportPercentage(ref one), &ViewportPercentage(ref other)) => {
|
||
one.partial_cmp(other)
|
||
},
|
||
(&ServoCharacterWidth(ref one), &ServoCharacterWidth(ref other)) => {
|
||
one.0.partial_cmp(&other.0)
|
||
},
|
||
// See https://github.com/rust-lang/rust/issues/68867. rustc isn't
|
||
// able to figure it own on its own so we help.
|
||
_ => unsafe {
|
||
match *self {
|
||
Absolute(..) |
|
||
FontRelative(..) |
|
||
ViewportPercentage(..) |
|
||
ServoCharacterWidth(..) => {},
|
||
}
|
||
debug_unreachable!("Forgot an arm in partial_cmp?")
|
||
},
|
||
}
|
||
}
|
||
}
|
||
|
||
impl Zero for NoCalcLength {
|
||
fn zero() -> Self {
|
||
NoCalcLength::Absolute(AbsoluteLength::Px(0.))
|
||
}
|
||
|
||
fn is_zero(&self) -> bool {
|
||
match *self {
|
||
NoCalcLength::Absolute(v) => v.is_zero(),
|
||
NoCalcLength::FontRelative(v) => v.is_zero(),
|
||
NoCalcLength::ViewportPercentage(v) => v.is_zero(),
|
||
NoCalcLength::ServoCharacterWidth(v) => v.0 == 0,
|
||
}
|
||
}
|
||
}
|
||
|
||
/// An extension to `NoCalcLength` to parse `calc` expressions.
|
||
/// This is commonly used for the `<length>` values.
|
||
///
|
||
/// <https://drafts.csswg.org/css-values/#lengths>
|
||
#[derive(Clone, Debug, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToCss, ToShmem)]
|
||
pub enum Length {
|
||
/// The internal length type that cannot parse `calc`
|
||
NoCalc(NoCalcLength),
|
||
/// A calc expression.
|
||
///
|
||
/// <https://drafts.csswg.org/css-values/#calc-notation>
|
||
Calc(Box<CalcLengthPercentage>),
|
||
}
|
||
|
||
impl From<NoCalcLength> for Length {
|
||
#[inline]
|
||
fn from(len: NoCalcLength) -> Self {
|
||
Length::NoCalc(len)
|
||
}
|
||
}
|
||
|
||
impl Mul<CSSFloat> for Length {
|
||
type Output = Length;
|
||
|
||
#[inline]
|
||
fn mul(self, scalar: CSSFloat) -> Length {
|
||
match self {
|
||
Length::NoCalc(inner) => Length::NoCalc(inner * scalar),
|
||
Length::Calc(..) => panic!("Can't multiply Calc!"),
|
||
}
|
||
}
|
||
}
|
||
|
||
impl PartialOrd for FontRelativeLength {
|
||
fn partial_cmp(&self, other: &Self) -> Option<cmp::Ordering> {
|
||
use self::FontRelativeLength::*;
|
||
|
||
if std::mem::discriminant(self) != std::mem::discriminant(other) {
|
||
return None;
|
||
}
|
||
|
||
match (self, other) {
|
||
(&Em(ref one), &Em(ref other)) => one.partial_cmp(other),
|
||
(&Ex(ref one), &Ex(ref other)) => one.partial_cmp(other),
|
||
(&Ch(ref one), &Ch(ref other)) => one.partial_cmp(other),
|
||
(&Cap(ref one), &Cap(ref other)) => one.partial_cmp(other),
|
||
(&Rem(ref one), &Rem(ref other)) => one.partial_cmp(other),
|
||
// See https://github.com/rust-lang/rust/issues/68867. rustc isn't
|
||
// able to figure it own on its own so we help.
|
||
_ => unsafe {
|
||
match *self {
|
||
Em(..) | Ex(..) | Ch(..) | Cap(..) | Rem(..) => {},
|
||
}
|
||
debug_unreachable!("Forgot an arm in partial_cmp?")
|
||
},
|
||
}
|
||
}
|
||
}
|
||
|
||
impl Mul<CSSFloat> for FontRelativeLength {
|
||
type Output = FontRelativeLength;
|
||
|
||
#[inline]
|
||
fn mul(self, scalar: CSSFloat) -> FontRelativeLength {
|
||
match self {
|
||
FontRelativeLength::Em(v) => FontRelativeLength::Em(v * scalar),
|
||
FontRelativeLength::Ex(v) => FontRelativeLength::Ex(v * scalar),
|
||
FontRelativeLength::Ch(v) => FontRelativeLength::Ch(v * scalar),
|
||
FontRelativeLength::Cap(v) => FontRelativeLength::Cap(v * scalar),
|
||
FontRelativeLength::Rem(v) => FontRelativeLength::Rem(v * scalar),
|
||
}
|
||
}
|
||
}
|
||
|
||
impl Mul<CSSFloat> for ViewportPercentageLength {
|
||
type Output = ViewportPercentageLength;
|
||
|
||
#[inline]
|
||
fn mul(self, scalar: CSSFloat) -> ViewportPercentageLength {
|
||
match self {
|
||
ViewportPercentageLength::Vw(v) => ViewportPercentageLength::Vw(v * scalar),
|
||
ViewportPercentageLength::Vh(v) => ViewportPercentageLength::Vh(v * scalar),
|
||
ViewportPercentageLength::Vmin(v) => ViewportPercentageLength::Vmin(v * scalar),
|
||
ViewportPercentageLength::Vmax(v) => ViewportPercentageLength::Vmax(v * scalar),
|
||
}
|
||
}
|
||
}
|
||
|
||
impl PartialOrd for ViewportPercentageLength {
|
||
fn partial_cmp(&self, other: &Self) -> Option<cmp::Ordering> {
|
||
use self::ViewportPercentageLength::*;
|
||
|
||
if std::mem::discriminant(self) != std::mem::discriminant(other) {
|
||
return None;
|
||
}
|
||
|
||
match (self, other) {
|
||
(&Vw(ref one), &Vw(ref other)) => one.partial_cmp(other),
|
||
(&Vh(ref one), &Vh(ref other)) => one.partial_cmp(other),
|
||
(&Vmin(ref one), &Vmin(ref other)) => one.partial_cmp(other),
|
||
(&Vmax(ref one), &Vmax(ref other)) => one.partial_cmp(other),
|
||
// See https://github.com/rust-lang/rust/issues/68867. rustc isn't
|
||
// able to figure it own on its own so we help.
|
||
_ => unsafe {
|
||
match *self {
|
||
Vw(..) | Vh(..) | Vmin(..) | Vmax(..) => {},
|
||
}
|
||
debug_unreachable!("Forgot an arm in partial_cmp?")
|
||
},
|
||
}
|
||
}
|
||
}
|
||
|
||
impl Length {
|
||
#[inline]
|
||
fn parse_internal<'i, 't>(
|
||
context: &ParserContext,
|
||
input: &mut Parser<'i, 't>,
|
||
num_context: AllowedNumericType,
|
||
allow_quirks: AllowQuirks,
|
||
) -> Result<Self, ParseError<'i>> {
|
||
let location = input.current_source_location();
|
||
let token = input.next()?;
|
||
match *token {
|
||
Token::Dimension {
|
||
value, ref unit, ..
|
||
} if num_context.is_ok(context.parsing_mode, value) => {
|
||
NoCalcLength::parse_dimension(context, value, unit)
|
||
.map(Length::NoCalc)
|
||
.map_err(|()| location.new_unexpected_token_error(token.clone()))
|
||
},
|
||
Token::Number { value, .. } if num_context.is_ok(context.parsing_mode, value) => {
|
||
if value != 0. &&
|
||
!context.parsing_mode.allows_unitless_lengths() &&
|
||
!allow_quirks.allowed(context.quirks_mode)
|
||
{
|
||
return Err(location.new_custom_error(StyleParseErrorKind::UnspecifiedError));
|
||
}
|
||
Ok(Length::NoCalc(NoCalcLength::Absolute(AbsoluteLength::Px(
|
||
value,
|
||
))))
|
||
},
|
||
Token::Function(ref name) => {
|
||
let function = CalcNode::math_function(name, location)?;
|
||
let calc = CalcNode::parse_length(context, input, num_context, function)?;
|
||
Ok(Length::Calc(Box::new(calc)))
|
||
},
|
||
ref token => return Err(location.new_unexpected_token_error(token.clone())),
|
||
}
|
||
}
|
||
|
||
/// Parse a non-negative length
|
||
#[inline]
|
||
pub fn parse_non_negative<'i, 't>(
|
||
context: &ParserContext,
|
||
input: &mut Parser<'i, 't>,
|
||
) -> Result<Self, ParseError<'i>> {
|
||
Self::parse_non_negative_quirky(context, input, AllowQuirks::No)
|
||
}
|
||
|
||
/// Parse a non-negative length, allowing quirks.
|
||
#[inline]
|
||
pub fn parse_non_negative_quirky<'i, 't>(
|
||
context: &ParserContext,
|
||
input: &mut Parser<'i, 't>,
|
||
allow_quirks: AllowQuirks,
|
||
) -> Result<Self, ParseError<'i>> {
|
||
Self::parse_internal(
|
||
context,
|
||
input,
|
||
AllowedNumericType::NonNegative,
|
||
allow_quirks,
|
||
)
|
||
}
|
||
|
||
/// Get an absolute length from a px value.
|
||
#[inline]
|
||
pub fn from_px(px_value: CSSFloat) -> Length {
|
||
Length::NoCalc(NoCalcLength::from_px(px_value))
|
||
}
|
||
}
|
||
|
||
impl Parse for Length {
|
||
fn parse<'i, 't>(
|
||
context: &ParserContext,
|
||
input: &mut Parser<'i, 't>,
|
||
) -> Result<Self, ParseError<'i>> {
|
||
Self::parse_quirky(context, input, AllowQuirks::No)
|
||
}
|
||
}
|
||
|
||
impl Zero for Length {
|
||
fn zero() -> Self {
|
||
Length::NoCalc(NoCalcLength::zero())
|
||
}
|
||
|
||
fn is_zero(&self) -> bool {
|
||
// FIXME(emilio): Seems a bit weird to treat calc() unconditionally as
|
||
// non-zero here?
|
||
match *self {
|
||
Length::NoCalc(ref l) => l.is_zero(),
|
||
Length::Calc(..) => false,
|
||
}
|
||
}
|
||
}
|
||
|
||
impl Length {
|
||
/// Parses a length, with quirks.
|
||
pub fn parse_quirky<'i, 't>(
|
||
context: &ParserContext,
|
||
input: &mut Parser<'i, 't>,
|
||
allow_quirks: AllowQuirks,
|
||
) -> Result<Self, ParseError<'i>> {
|
||
Self::parse_internal(context, input, AllowedNumericType::All, allow_quirks)
|
||
}
|
||
}
|
||
|
||
/// A wrapper of Length, whose value must be >= 0.
|
||
pub type NonNegativeLength = NonNegative<Length>;
|
||
|
||
impl Parse for NonNegativeLength {
|
||
#[inline]
|
||
fn parse<'i, 't>(
|
||
context: &ParserContext,
|
||
input: &mut Parser<'i, 't>,
|
||
) -> Result<Self, ParseError<'i>> {
|
||
Ok(NonNegative(Length::parse_non_negative(context, input)?))
|
||
}
|
||
}
|
||
|
||
impl From<NoCalcLength> for NonNegativeLength {
|
||
#[inline]
|
||
fn from(len: NoCalcLength) -> Self {
|
||
NonNegative(Length::NoCalc(len))
|
||
}
|
||
}
|
||
|
||
impl From<Length> for NonNegativeLength {
|
||
#[inline]
|
||
fn from(len: Length) -> Self {
|
||
NonNegative(len)
|
||
}
|
||
}
|
||
|
||
impl NonNegativeLength {
|
||
/// Get an absolute length from a px value.
|
||
#[inline]
|
||
pub fn from_px(px_value: CSSFloat) -> Self {
|
||
Length::from_px(px_value.max(0.)).into()
|
||
}
|
||
|
||
/// Parses a non-negative length, optionally with quirks.
|
||
#[inline]
|
||
pub fn parse_quirky<'i, 't>(
|
||
context: &ParserContext,
|
||
input: &mut Parser<'i, 't>,
|
||
allow_quirks: AllowQuirks,
|
||
) -> Result<Self, ParseError<'i>> {
|
||
Ok(NonNegative(Length::parse_non_negative_quirky(
|
||
context,
|
||
input,
|
||
allow_quirks,
|
||
)?))
|
||
}
|
||
}
|
||
|
||
/// A `<length-percentage>` value. This can be either a `<length>`, a
|
||
/// `<percentage>`, or a combination of both via `calc()`.
|
||
///
|
||
/// https://drafts.csswg.org/css-values-4/#typedef-length-percentage
|
||
#[allow(missing_docs)]
|
||
#[derive(Clone, Debug, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToCss, ToShmem)]
|
||
pub enum LengthPercentage {
|
||
Length(NoCalcLength),
|
||
Percentage(computed::Percentage),
|
||
Calc(Box<CalcLengthPercentage>),
|
||
}
|
||
|
||
impl From<Length> for LengthPercentage {
|
||
fn from(len: Length) -> LengthPercentage {
|
||
match len {
|
||
Length::NoCalc(l) => LengthPercentage::Length(l),
|
||
Length::Calc(l) => LengthPercentage::Calc(l),
|
||
}
|
||
}
|
||
}
|
||
|
||
impl From<NoCalcLength> for LengthPercentage {
|
||
#[inline]
|
||
fn from(len: NoCalcLength) -> Self {
|
||
LengthPercentage::Length(len)
|
||
}
|
||
}
|
||
|
||
impl From<Percentage> for LengthPercentage {
|
||
#[inline]
|
||
fn from(pc: Percentage) -> Self {
|
||
if pc.is_calc() {
|
||
// FIXME(emilio): Hard-coding the clamping mode is suspect.
|
||
LengthPercentage::Calc(Box::new(CalcLengthPercentage {
|
||
clamping_mode: AllowedNumericType::All,
|
||
node: CalcNode::Leaf(calc::Leaf::Percentage(pc.get())),
|
||
}))
|
||
} else {
|
||
LengthPercentage::Percentage(computed::Percentage(pc.get()))
|
||
}
|
||
}
|
||
}
|
||
|
||
impl From<computed::Percentage> for LengthPercentage {
|
||
#[inline]
|
||
fn from(pc: computed::Percentage) -> Self {
|
||
LengthPercentage::Percentage(pc)
|
||
}
|
||
}
|
||
|
||
impl Parse for LengthPercentage {
|
||
#[inline]
|
||
fn parse<'i, 't>(
|
||
context: &ParserContext,
|
||
input: &mut Parser<'i, 't>,
|
||
) -> Result<Self, ParseError<'i>> {
|
||
Self::parse_quirky(context, input, AllowQuirks::No)
|
||
}
|
||
}
|
||
|
||
impl LengthPercentage {
|
||
#[inline]
|
||
/// Returns a `0%` value.
|
||
pub fn zero_percent() -> LengthPercentage {
|
||
LengthPercentage::Percentage(computed::Percentage::zero())
|
||
}
|
||
|
||
fn parse_internal<'i, 't>(
|
||
context: &ParserContext,
|
||
input: &mut Parser<'i, 't>,
|
||
num_context: AllowedNumericType,
|
||
allow_quirks: AllowQuirks,
|
||
) -> Result<Self, ParseError<'i>> {
|
||
let location = input.current_source_location();
|
||
let token = input.next()?;
|
||
match *token {
|
||
Token::Dimension {
|
||
value, ref unit, ..
|
||
} if num_context.is_ok(context.parsing_mode, value) => {
|
||
return NoCalcLength::parse_dimension(context, value, unit)
|
||
.map(LengthPercentage::Length)
|
||
.map_err(|()| location.new_unexpected_token_error(token.clone()));
|
||
},
|
||
Token::Percentage { unit_value, .. }
|
||
if num_context.is_ok(context.parsing_mode, unit_value) =>
|
||
{
|
||
return Ok(LengthPercentage::Percentage(computed::Percentage(
|
||
unit_value,
|
||
)));
|
||
},
|
||
Token::Number { value, .. } if num_context.is_ok(context.parsing_mode, value) => {
|
||
if value != 0. &&
|
||
!context.parsing_mode.allows_unitless_lengths() &&
|
||
!allow_quirks.allowed(context.quirks_mode)
|
||
{
|
||
return Err(location.new_unexpected_token_error(token.clone()));
|
||
} else {
|
||
return Ok(LengthPercentage::Length(NoCalcLength::from_px(value)));
|
||
}
|
||
},
|
||
Token::Function(ref name) => {
|
||
let function = CalcNode::math_function(name, location)?;
|
||
let calc =
|
||
CalcNode::parse_length_or_percentage(context, input, num_context, function)?;
|
||
Ok(LengthPercentage::Calc(Box::new(calc)))
|
||
},
|
||
_ => return Err(location.new_unexpected_token_error(token.clone())),
|
||
}
|
||
}
|
||
|
||
/// Parses allowing the unitless length quirk.
|
||
/// <https://quirks.spec.whatwg.org/#the-unitless-length-quirk>
|
||
#[inline]
|
||
pub fn parse_quirky<'i, 't>(
|
||
context: &ParserContext,
|
||
input: &mut Parser<'i, 't>,
|
||
allow_quirks: AllowQuirks,
|
||
) -> Result<Self, ParseError<'i>> {
|
||
Self::parse_internal(context, input, AllowedNumericType::All, allow_quirks)
|
||
}
|
||
|
||
/// Parse a non-negative length.
|
||
///
|
||
/// FIXME(emilio): This should be not public and we should use
|
||
/// NonNegativeLengthPercentage instead.
|
||
#[inline]
|
||
pub fn parse_non_negative<'i, 't>(
|
||
context: &ParserContext,
|
||
input: &mut Parser<'i, 't>,
|
||
) -> Result<Self, ParseError<'i>> {
|
||
Self::parse_non_negative_quirky(context, input, AllowQuirks::No)
|
||
}
|
||
|
||
/// Parse a non-negative length, with quirks.
|
||
#[inline]
|
||
pub fn parse_non_negative_quirky<'i, 't>(
|
||
context: &ParserContext,
|
||
input: &mut Parser<'i, 't>,
|
||
allow_quirks: AllowQuirks,
|
||
) -> Result<Self, ParseError<'i>> {
|
||
Self::parse_internal(
|
||
context,
|
||
input,
|
||
AllowedNumericType::NonNegative,
|
||
allow_quirks,
|
||
)
|
||
}
|
||
}
|
||
|
||
impl Zero for LengthPercentage {
|
||
fn zero() -> Self {
|
||
LengthPercentage::Length(NoCalcLength::zero())
|
||
}
|
||
|
||
fn is_zero(&self) -> bool {
|
||
match *self {
|
||
LengthPercentage::Length(l) => l.is_zero(),
|
||
LengthPercentage::Percentage(p) => p.0 == 0.0,
|
||
LengthPercentage::Calc(_) => false,
|
||
}
|
||
}
|
||
}
|
||
|
||
/// A specified type for `<length-percentage> | auto`.
|
||
pub type LengthPercentageOrAuto = generics::LengthPercentageOrAuto<LengthPercentage>;
|
||
|
||
impl LengthPercentageOrAuto {
|
||
/// Returns a value representing `0%`.
|
||
#[inline]
|
||
pub fn zero_percent() -> Self {
|
||
generics::LengthPercentageOrAuto::LengthPercentage(LengthPercentage::zero_percent())
|
||
}
|
||
|
||
/// Parses a length or a percentage, allowing the unitless length quirk.
|
||
/// <https://quirks.spec.whatwg.org/#the-unitless-length-quirk>
|
||
#[inline]
|
||
pub fn parse_quirky<'i, 't>(
|
||
context: &ParserContext,
|
||
input: &mut Parser<'i, 't>,
|
||
allow_quirks: AllowQuirks,
|
||
) -> Result<Self, ParseError<'i>> {
|
||
Self::parse_with(context, input, |context, input| {
|
||
LengthPercentage::parse_quirky(context, input, allow_quirks)
|
||
})
|
||
}
|
||
}
|
||
|
||
/// A wrapper of LengthPercentageOrAuto, whose value must be >= 0.
|
||
pub type NonNegativeLengthPercentageOrAuto =
|
||
generics::LengthPercentageOrAuto<NonNegativeLengthPercentage>;
|
||
|
||
impl NonNegativeLengthPercentageOrAuto {
|
||
/// Returns a value representing `0%`.
|
||
#[inline]
|
||
pub fn zero_percent() -> Self {
|
||
generics::LengthPercentageOrAuto::LengthPercentage(
|
||
NonNegativeLengthPercentage::zero_percent(),
|
||
)
|
||
}
|
||
|
||
/// Parses a non-negative length-percentage, allowing the unitless length
|
||
/// quirk.
|
||
#[inline]
|
||
pub fn parse_quirky<'i, 't>(
|
||
context: &ParserContext,
|
||
input: &mut Parser<'i, 't>,
|
||
allow_quirks: AllowQuirks,
|
||
) -> Result<Self, ParseError<'i>> {
|
||
Self::parse_with(context, input, |context, input| {
|
||
NonNegativeLengthPercentage::parse_quirky(context, input, allow_quirks)
|
||
})
|
||
}
|
||
}
|
||
|
||
/// A wrapper of LengthPercentage, whose value must be >= 0.
|
||
pub type NonNegativeLengthPercentage = NonNegative<LengthPercentage>;
|
||
|
||
/// Either a NonNegativeLengthPercentage or the `normal` keyword.
|
||
pub type NonNegativeLengthPercentageOrNormal =
|
||
GenericLengthPercentageOrNormal<NonNegativeLengthPercentage>;
|
||
|
||
impl From<NoCalcLength> for NonNegativeLengthPercentage {
|
||
#[inline]
|
||
fn from(len: NoCalcLength) -> Self {
|
||
NonNegative(LengthPercentage::from(len))
|
||
}
|
||
}
|
||
|
||
impl Parse for NonNegativeLengthPercentage {
|
||
#[inline]
|
||
fn parse<'i, 't>(
|
||
context: &ParserContext,
|
||
input: &mut Parser<'i, 't>,
|
||
) -> Result<Self, ParseError<'i>> {
|
||
Self::parse_quirky(context, input, AllowQuirks::No)
|
||
}
|
||
}
|
||
|
||
impl NonNegativeLengthPercentage {
|
||
#[inline]
|
||
/// Returns a `0%` value.
|
||
pub fn zero_percent() -> Self {
|
||
NonNegative(LengthPercentage::zero_percent())
|
||
}
|
||
|
||
/// Parses a length or a percentage, allowing the unitless length quirk.
|
||
/// <https://quirks.spec.whatwg.org/#the-unitless-length-quirk>
|
||
#[inline]
|
||
pub fn parse_quirky<'i, 't>(
|
||
context: &ParserContext,
|
||
input: &mut Parser<'i, 't>,
|
||
allow_quirks: AllowQuirks,
|
||
) -> Result<Self, ParseError<'i>> {
|
||
LengthPercentage::parse_non_negative_quirky(context, input, allow_quirks).map(NonNegative)
|
||
}
|
||
}
|
||
|
||
/// Either a `<length>` or the `auto` keyword.
|
||
///
|
||
/// Note that we use LengthPercentage just for convenience, since it pretty much
|
||
/// is everything we care about, but we could just add a similar LengthOrAuto
|
||
/// instead if we think getting rid of this weirdness is worth it.
|
||
pub type LengthOrAuto = generics::LengthPercentageOrAuto<Length>;
|
||
|
||
impl LengthOrAuto {
|
||
/// Parses a length, allowing the unitless length quirk.
|
||
/// <https://quirks.spec.whatwg.org/#the-unitless-length-quirk>
|
||
#[inline]
|
||
pub fn parse_quirky<'i, 't>(
|
||
context: &ParserContext,
|
||
input: &mut Parser<'i, 't>,
|
||
allow_quirks: AllowQuirks,
|
||
) -> Result<Self, ParseError<'i>> {
|
||
Self::parse_with(context, input, |context, input| {
|
||
Length::parse_quirky(context, input, allow_quirks)
|
||
})
|
||
}
|
||
}
|
||
|
||
/// Either a non-negative `<length>` or the `auto` keyword.
|
||
pub type NonNegativeLengthOrAuto = generics::LengthPercentageOrAuto<NonNegativeLength>;
|
||
|
||
/// Either a `<length>` or a `<number>`.
|
||
pub type LengthOrNumber = GenericLengthOrNumber<Length, Number>;
|
||
|
||
/// A specified value for `min-width`, `min-height`, `width` or `height` property.
|
||
pub type Size = GenericSize<NonNegativeLengthPercentage>;
|
||
|
||
impl Parse for Size {
|
||
fn parse<'i, 't>(
|
||
context: &ParserContext,
|
||
input: &mut Parser<'i, 't>,
|
||
) -> Result<Self, ParseError<'i>> {
|
||
Size::parse_quirky(context, input, AllowQuirks::No)
|
||
}
|
||
}
|
||
|
||
impl Size {
|
||
/// Parses, with quirks.
|
||
pub fn parse_quirky<'i, 't>(
|
||
context: &ParserContext,
|
||
input: &mut Parser<'i, 't>,
|
||
allow_quirks: AllowQuirks,
|
||
) -> Result<Self, ParseError<'i>> {
|
||
#[cfg(feature = "gecko")]
|
||
{
|
||
if let Ok(l) = input.try_parse(computed::ExtremumLength::parse) {
|
||
return Ok(GenericSize::ExtremumLength(l));
|
||
}
|
||
}
|
||
|
||
if input.try_parse(|i| i.expect_ident_matching("auto")).is_ok() {
|
||
return Ok(GenericSize::Auto);
|
||
}
|
||
|
||
let length = NonNegativeLengthPercentage::parse_quirky(context, input, allow_quirks)?;
|
||
Ok(GenericSize::LengthPercentage(length))
|
||
}
|
||
|
||
/// Returns `0%`.
|
||
#[inline]
|
||
pub fn zero_percent() -> Self {
|
||
GenericSize::LengthPercentage(NonNegativeLengthPercentage::zero_percent())
|
||
}
|
||
}
|
||
|
||
/// A specified value for `max-width` or `max-height` property.
|
||
pub type MaxSize = GenericMaxSize<NonNegativeLengthPercentage>;
|
||
|
||
impl Parse for MaxSize {
|
||
fn parse<'i, 't>(
|
||
context: &ParserContext,
|
||
input: &mut Parser<'i, 't>,
|
||
) -> Result<Self, ParseError<'i>> {
|
||
MaxSize::parse_quirky(context, input, AllowQuirks::No)
|
||
}
|
||
}
|
||
|
||
impl MaxSize {
|
||
/// Parses, with quirks.
|
||
pub fn parse_quirky<'i, 't>(
|
||
context: &ParserContext,
|
||
input: &mut Parser<'i, 't>,
|
||
allow_quirks: AllowQuirks,
|
||
) -> Result<Self, ParseError<'i>> {
|
||
#[cfg(feature = "gecko")]
|
||
{
|
||
if let Ok(l) = input.try_parse(computed::ExtremumLength::parse) {
|
||
return Ok(GenericMaxSize::ExtremumLength(l));
|
||
}
|
||
}
|
||
|
||
if input.try_parse(|i| i.expect_ident_matching("none")).is_ok() {
|
||
return Ok(GenericMaxSize::None);
|
||
}
|
||
|
||
let length = NonNegativeLengthPercentage::parse_quirky(context, input, allow_quirks)?;
|
||
Ok(GenericMaxSize::LengthPercentage(length))
|
||
}
|
||
}
|
||
|
||
/// A specified non-negative `<length>` | `<number>`.
|
||
pub type NonNegativeLengthOrNumber = GenericLengthOrNumber<NonNegativeLength, NonNegativeNumber>;
|