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7fe7b2ffb1
Most of types just derive it using proc_macro directly. Some of value types need manual impl. In my current plan, this new trait will be used in bug 1434130 to expose values as well. Bug: 1455576 Reviewed-by: emilio MozReview-Commit-ID: LI7fy45VkRw
1298 lines
44 KiB
Rust
1298 lines
44 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 http://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 app_units::Au;
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use cssparser::{Parser, Token};
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use euclid::Size2D;
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use font_metrics::FontMetricsQueryResult;
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use parser::{Parse, ParserContext};
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use std::cmp;
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use std::ops::{Add, Mul};
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use style_traits::{ParseError, SpecifiedValueInfo, StyleParseErrorKind};
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use style_traits::values::specified::AllowedNumericType;
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use super::{AllowQuirks, Number, Percentage, ToComputedValue};
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use values::{Auto, CSSFloat, Either, Normal};
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use values::computed::{self, CSSPixelLength, Context, ExtremumLength};
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use values::generics::NonNegative;
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use values::specified::calc::CalcNode;
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pub use values::specified::calc::CalcLengthOrPercentage;
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pub use super::image::{ColorStop, EndingShape as GradientEndingShape, Gradient};
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pub use super::image::{GradientKind, Image};
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/// Number of app units per pixel
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pub const AU_PER_PX: CSSFloat = 60.;
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/// Number of app units per inch
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pub const AU_PER_IN: CSSFloat = AU_PER_PX * 96.;
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/// Number of app units per centimeter
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pub const AU_PER_CM: CSSFloat = AU_PER_IN / 2.54;
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/// Number of app units per millimeter
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pub const AU_PER_MM: CSSFloat = AU_PER_IN / 25.4;
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/// Number of app units per quarter
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pub const AU_PER_Q: CSSFloat = AU_PER_MM / 4.;
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/// Number of app units per point
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pub const AU_PER_PT: CSSFloat = AU_PER_IN / 72.;
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/// Number of app units per pica
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pub const AU_PER_PC: CSSFloat = AU_PER_PT * 12.;
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/// Same as Gecko's AppUnitsToIntCSSPixels
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///
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/// Converts app units to integer pixel values,
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/// rounding during the conversion
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pub fn au_to_int_px(au: f32) -> i32 {
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(au / AU_PER_PX).round() as i32
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}
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/// A font relative length.
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#[derive(Clone, Copy, Debug, MallocSizeOf, PartialEq, ToCss)]
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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 "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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/// Use the inherited font-size, but strip em units.
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///
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/// FIXME(emilio): This is very complex, and should go away.
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InheritedStyleButStripEmUnits,
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/// Use a custom base size.
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///
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/// FIXME(emilio): This is very dubious, and only used for MathML.
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Custom(Au),
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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) -> Au {
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match *self {
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FontBaseSize::Custom(size) => size,
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FontBaseSize::CurrentStyle => context.style().get_font().clone_font_size().size(),
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FontBaseSize::InheritedStyleButStripEmUnits | 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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/// Computes the font-relative length.
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pub fn to_computed_value(&self, context: &Context, base_size: FontBaseSize) -> CSSPixelLength {
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use std::f32;
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let (reference_size, length) = self.reference_font_size_and_length(context, base_size);
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let pixel = (length * reference_size.to_f32_px())
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.min(f32::MAX)
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.max(f32::MIN);
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CSSPixelLength::new(pixel)
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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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) -> (Au, CSSFloat) {
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fn query_font_metrics(
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context: &Context,
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reference_font_size: Au,
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) -> FontMetricsQueryResult {
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context.font_metrics_provider.query(
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context.style().get_font(),
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reference_font_size,
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context.style().writing_mode,
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context.in_media_query,
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context.device(),
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)
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}
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let reference_font_size = base_size.resolve(context);
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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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if base_size == FontBaseSize::InheritedStyleButStripEmUnits {
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(Au(0), length)
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} else {
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(reference_font_size, length)
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}
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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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let reference_size = match query_font_metrics(context, reference_font_size) {
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FontMetricsQueryResult::Available(metrics) => metrics.x_height,
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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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FontMetricsQueryResult::NotAvailable => reference_font_size.scale_by(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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let reference_size = match query_font_metrics(context, reference_font_size) {
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FontMetricsQueryResult::Available(metrics) => metrics.zero_advance_measure,
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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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FontMetricsQueryResult::NotAvailable => {
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if context.style().writing_mode.is_vertical() {
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reference_font_size
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} else {
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reference_font_size.scale_by(0.5)
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}
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},
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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.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)]
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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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/// 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)]
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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: Au) -> CSSPixelLength {
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// This applies the *converting a character width to pixels* algorithm as specified
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// 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.scale_by(0.5);
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let max_advance = reference_font_size;
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let au = average_advance.scale_by(self.0 as CSSFloat - 1.0) + max_advance;
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au.into()
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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)]
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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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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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/// Convert this into a pixel value.
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#[inline]
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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 * (AU_PER_IN / AU_PER_PX),
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AbsoluteLength::Cm(value) => value * (AU_PER_CM / AU_PER_PX),
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AbsoluteLength::Mm(value) => value * (AU_PER_MM / AU_PER_PX),
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AbsoluteLength::Q(value) => value * (AU_PER_Q / AU_PER_PX),
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AbsoluteLength::Pt(value) => value * (AU_PER_PT / AU_PER_PX),
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AbsoluteLength::Pc(value) => value * (AU_PER_PC / AU_PER_PX),
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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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impl ToComputedValue for AbsoluteLength {
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type ComputedValue = CSSPixelLength;
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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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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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impl Mul<CSSFloat> for AbsoluteLength {
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type Output = AbsoluteLength;
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#[inline]
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fn mul(self, scalar: CSSFloat) -> AbsoluteLength {
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match self {
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AbsoluteLength::Px(v) => AbsoluteLength::Px(v * scalar),
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AbsoluteLength::In(v) => AbsoluteLength::In(v * scalar),
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AbsoluteLength::Cm(v) => AbsoluteLength::Cm(v * scalar),
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AbsoluteLength::Mm(v) => AbsoluteLength::Mm(v * scalar),
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AbsoluteLength::Q(v) => AbsoluteLength::Q(v * scalar),
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AbsoluteLength::Pt(v) => AbsoluteLength::Pt(v * scalar),
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AbsoluteLength::Pc(v) => AbsoluteLength::Pc(v * scalar),
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}
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}
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}
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impl Add<AbsoluteLength> for AbsoluteLength {
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type Output = Self;
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#[inline]
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fn add(self, rhs: Self) -> Self {
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match (self, rhs) {
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(AbsoluteLength::Px(x), AbsoluteLength::Px(y)) => AbsoluteLength::Px(x + y),
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(AbsoluteLength::In(x), AbsoluteLength::In(y)) => AbsoluteLength::In(x + y),
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(AbsoluteLength::Cm(x), AbsoluteLength::Cm(y)) => AbsoluteLength::Cm(x + y),
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(AbsoluteLength::Mm(x), AbsoluteLength::Mm(y)) => AbsoluteLength::Mm(x + y),
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(AbsoluteLength::Q(x), AbsoluteLength::Q(y)) => AbsoluteLength::Q(x + y),
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(AbsoluteLength::Pt(x), AbsoluteLength::Pt(y)) => AbsoluteLength::Pt(x + y),
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(AbsoluteLength::Pc(x), AbsoluteLength::Pc(y)) => AbsoluteLength::Pc(x + y),
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_ => AbsoluteLength::Px(self.to_px() + rhs.to_px()),
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}
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}
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}
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/// A `<length>` without taking `calc` expressions into account
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///
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/// <https://drafts.csswg.org/css-values/#lengths>
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#[derive(Clone, Copy, Debug, MallocSizeOf, PartialEq, ToCss)]
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pub enum NoCalcLength {
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/// An absolute length
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///
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/// <https://drafts.csswg.org/css-values/#absolute-length>
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Absolute(AbsoluteLength),
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/// A font-relative length:
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///
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/// <https://drafts.csswg.org/css-values/#font-relative-lengths>
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FontRelative(FontRelativeLength),
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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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ViewportPercentage(ViewportPercentageLength),
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/// HTML5 "character width", as defined in HTML5 § 14.5.4.
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///
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/// This cannot be specified by the user directly and is only generated by
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/// `Stylist::synthesize_rules_for_legacy_attributes()`.
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#[css(function)]
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ServoCharacterWidth(CharacterWidth),
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}
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impl Mul<CSSFloat> for NoCalcLength {
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type Output = NoCalcLength;
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#[inline]
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fn mul(self, scalar: CSSFloat) -> NoCalcLength {
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match self {
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NoCalcLength::Absolute(v) => NoCalcLength::Absolute(v * scalar),
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NoCalcLength::FontRelative(v) => NoCalcLength::FontRelative(v * scalar),
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NoCalcLength::ViewportPercentage(v) => NoCalcLength::ViewportPercentage(v * scalar),
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NoCalcLength::ServoCharacterWidth(_) => panic!("Can't multiply ServoCharacterWidth!"),
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}
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}
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}
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impl NoCalcLength {
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/// Parse a given absolute or relative dimension.
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pub fn parse_dimension(
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context: &ParserContext,
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value: CSSFloat,
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unit: &str,
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) -> Result<Self, ()> {
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match_ignore_ascii_case! { unit,
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"px" => Ok(NoCalcLength::Absolute(AbsoluteLength::Px(value))),
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"in" => Ok(NoCalcLength::Absolute(AbsoluteLength::In(value))),
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"cm" => Ok(NoCalcLength::Absolute(AbsoluteLength::Cm(value))),
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"mm" => Ok(NoCalcLength::Absolute(AbsoluteLength::Mm(value))),
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"q" => Ok(NoCalcLength::Absolute(AbsoluteLength::Q(value))),
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"pt" => Ok(NoCalcLength::Absolute(AbsoluteLength::Pt(value))),
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"pc" => Ok(NoCalcLength::Absolute(AbsoluteLength::Pc(value))),
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// font-relative
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"em" => Ok(NoCalcLength::FontRelative(FontRelativeLength::Em(value))),
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"ex" => Ok(NoCalcLength::FontRelative(FontRelativeLength::Ex(value))),
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"ch" => Ok(NoCalcLength::FontRelative(FontRelativeLength::Ch(value))),
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"rem" => Ok(NoCalcLength::FontRelative(FontRelativeLength::Rem(value))),
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// viewport percentages
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"vw" => {
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if context.in_page_rule() {
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return Err(())
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}
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Ok(NoCalcLength::ViewportPercentage(ViewportPercentageLength::Vw(value)))
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},
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"vh" => {
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if context.in_page_rule() {
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return Err(())
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}
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Ok(NoCalcLength::ViewportPercentage(ViewportPercentageLength::Vh(value)))
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},
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"vmin" => {
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if context.in_page_rule() {
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return Err(())
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}
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Ok(NoCalcLength::ViewportPercentage(ViewportPercentageLength::Vmin(value)))
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},
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"vmax" => {
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if context.in_page_rule() {
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return Err(())
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}
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Ok(NoCalcLength::ViewportPercentage(ViewportPercentageLength::Vmax(value)))
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},
|
|
_ => Err(())
|
|
}
|
|
}
|
|
|
|
#[inline]
|
|
/// Returns a `zero` length.
|
|
pub fn zero() -> NoCalcLength {
|
|
NoCalcLength::Absolute(AbsoluteLength::Px(0.))
|
|
}
|
|
|
|
#[inline]
|
|
/// Checks whether the length value is zero.
|
|
pub fn is_zero(&self) -> bool {
|
|
match *self {
|
|
NoCalcLength::Absolute(length) => length.is_zero(),
|
|
_ => false,
|
|
}
|
|
}
|
|
|
|
/// 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 {}
|
|
|
|
/// 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)]
|
|
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<CalcLengthOrPercentage>),
|
|
}
|
|
|
|
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 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::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 Length {
|
|
#[inline]
|
|
/// Returns a `zero` length.
|
|
pub fn zero() -> Length {
|
|
Length::NoCalc(NoCalcLength::zero())
|
|
}
|
|
|
|
#[inline]
|
|
fn parse_internal<'i, 't>(
|
|
context: &ParserContext,
|
|
input: &mut Parser<'i, 't>,
|
|
num_context: AllowedNumericType,
|
|
allow_quirks: AllowQuirks,
|
|
) -> Result<Self, ParseError<'i>> {
|
|
// FIXME: remove early returns when lifetimes are non-lexical
|
|
{
|
|
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(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));
|
|
}
|
|
return Ok(Length::NoCalc(NoCalcLength::Absolute(AbsoluteLength::Px(
|
|
value,
|
|
))));
|
|
},
|
|
Token::Function(ref name) if name.eq_ignore_ascii_case("calc") => {},
|
|
ref token => return Err(location.new_unexpected_token_error(token.clone())),
|
|
}
|
|
}
|
|
input.parse_nested_block(|input| {
|
|
CalcNode::parse_length(context, input, num_context)
|
|
.map(|calc| Length::Calc(Box::new(calc)))
|
|
})
|
|
}
|
|
|
|
/// 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 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>(Length::NoCalc(len))
|
|
}
|
|
}
|
|
|
|
impl From<Length> for NonNegativeLength {
|
|
#[inline]
|
|
fn from(len: Length) -> Self {
|
|
NonNegative::<Length>(len)
|
|
}
|
|
}
|
|
|
|
impl NonNegativeLength {
|
|
/// Returns a `zero` length.
|
|
#[inline]
|
|
pub fn zero() -> Self {
|
|
Length::zero().into()
|
|
}
|
|
|
|
/// 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()
|
|
}
|
|
}
|
|
|
|
/// Either a NonNegativeLength or the `auto` keyword.
|
|
pub type NonNegativeLengthOrAuto = Either<NonNegativeLength, Auto>;
|
|
|
|
/// A length or a percentage value.
|
|
#[allow(missing_docs)]
|
|
#[derive(Clone, Debug, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToCss)]
|
|
pub enum LengthOrPercentage {
|
|
Length(NoCalcLength),
|
|
Percentage(computed::Percentage),
|
|
Calc(Box<CalcLengthOrPercentage>),
|
|
}
|
|
|
|
impl From<Length> for LengthOrPercentage {
|
|
fn from(len: Length) -> LengthOrPercentage {
|
|
match len {
|
|
Length::NoCalc(l) => LengthOrPercentage::Length(l),
|
|
Length::Calc(l) => LengthOrPercentage::Calc(l),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl From<NoCalcLength> for LengthOrPercentage {
|
|
#[inline]
|
|
fn from(len: NoCalcLength) -> Self {
|
|
LengthOrPercentage::Length(len)
|
|
}
|
|
}
|
|
|
|
impl From<Percentage> for LengthOrPercentage {
|
|
#[inline]
|
|
fn from(pc: Percentage) -> Self {
|
|
if pc.is_calc() {
|
|
LengthOrPercentage::Calc(Box::new(CalcLengthOrPercentage {
|
|
percentage: Some(computed::Percentage(pc.get())),
|
|
..Default::default()
|
|
}))
|
|
} else {
|
|
LengthOrPercentage::Percentage(computed::Percentage(pc.get()))
|
|
}
|
|
}
|
|
}
|
|
|
|
impl From<computed::Percentage> for LengthOrPercentage {
|
|
#[inline]
|
|
fn from(pc: computed::Percentage) -> Self {
|
|
LengthOrPercentage::Percentage(pc)
|
|
}
|
|
}
|
|
|
|
impl LengthOrPercentage {
|
|
#[inline]
|
|
/// Returns a `zero` length.
|
|
pub fn zero() -> LengthOrPercentage {
|
|
LengthOrPercentage::Length(NoCalcLength::zero())
|
|
}
|
|
|
|
fn parse_internal<'i, 't>(
|
|
context: &ParserContext,
|
|
input: &mut Parser<'i, 't>,
|
|
num_context: AllowedNumericType,
|
|
allow_quirks: AllowQuirks,
|
|
) -> Result<Self, ParseError<'i>> {
|
|
// FIXME: remove early returns when lifetimes are non-lexical
|
|
{
|
|
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(LengthOrPercentage::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(LengthOrPercentage::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(LengthOrPercentage::Length(NoCalcLength::from_px(value)));
|
|
}
|
|
},
|
|
Token::Function(ref name) if name.eq_ignore_ascii_case("calc") => {},
|
|
_ => return Err(location.new_unexpected_token_error(token.clone())),
|
|
}
|
|
}
|
|
|
|
let calc = input
|
|
.parse_nested_block(|i| CalcNode::parse_length_or_percentage(context, i, num_context))?;
|
|
Ok(LengthOrPercentage::Calc(Box::new(calc)))
|
|
}
|
|
|
|
/// Parse a non-negative length.
|
|
#[inline]
|
|
pub fn parse_non_negative<'i, 't>(
|
|
context: &ParserContext,
|
|
input: &mut Parser<'i, 't>,
|
|
) -> Result<LengthOrPercentage, 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<LengthOrPercentage, ParseError<'i>> {
|
|
Self::parse_internal(
|
|
context,
|
|
input,
|
|
AllowedNumericType::NonNegative,
|
|
allow_quirks,
|
|
)
|
|
}
|
|
}
|
|
|
|
impl Parse for LengthOrPercentage {
|
|
#[inline]
|
|
fn parse<'i, 't>(
|
|
context: &ParserContext,
|
|
input: &mut Parser<'i, 't>,
|
|
) -> Result<Self, ParseError<'i>> {
|
|
Self::parse_quirky(context, input, AllowQuirks::No)
|
|
}
|
|
}
|
|
|
|
impl LengthOrPercentage {
|
|
/// 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_internal(context, input, AllowedNumericType::All, allow_quirks)
|
|
}
|
|
}
|
|
|
|
/// Either a `<length>`, a `<percentage>`, or the `auto` keyword.
|
|
#[allow(missing_docs)]
|
|
#[derive(Clone, Debug, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToCss)]
|
|
pub enum LengthOrPercentageOrAuto {
|
|
Length(NoCalcLength),
|
|
Percentage(computed::Percentage),
|
|
Auto,
|
|
Calc(Box<CalcLengthOrPercentage>),
|
|
}
|
|
|
|
impl From<NoCalcLength> for LengthOrPercentageOrAuto {
|
|
#[inline]
|
|
fn from(len: NoCalcLength) -> Self {
|
|
LengthOrPercentageOrAuto::Length(len)
|
|
}
|
|
}
|
|
|
|
impl From<computed::Percentage> for LengthOrPercentageOrAuto {
|
|
#[inline]
|
|
fn from(pc: computed::Percentage) -> Self {
|
|
LengthOrPercentageOrAuto::Percentage(pc)
|
|
}
|
|
}
|
|
|
|
impl LengthOrPercentageOrAuto {
|
|
fn parse_internal<'i, 't>(
|
|
context: &ParserContext,
|
|
input: &mut Parser<'i, 't>,
|
|
num_context: AllowedNumericType,
|
|
allow_quirks: AllowQuirks,
|
|
) -> Result<Self, ParseError<'i>> {
|
|
// FIXME: remove early returns when lifetimes are non-lexical
|
|
{
|
|
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(LengthOrPercentageOrAuto::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(LengthOrPercentageOrAuto::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_custom_error(StyleParseErrorKind::UnspecifiedError));
|
|
}
|
|
return Ok(LengthOrPercentageOrAuto::Length(NoCalcLength::Absolute(
|
|
AbsoluteLength::Px(value),
|
|
)));
|
|
},
|
|
Token::Ident(ref value) if value.eq_ignore_ascii_case("auto") => {
|
|
return Ok(LengthOrPercentageOrAuto::Auto)
|
|
},
|
|
Token::Function(ref name) if name.eq_ignore_ascii_case("calc") => {},
|
|
_ => return Err(location.new_unexpected_token_error(token.clone())),
|
|
}
|
|
}
|
|
|
|
let calc = input
|
|
.parse_nested_block(|i| CalcNode::parse_length_or_percentage(context, i, num_context))?;
|
|
Ok(LengthOrPercentageOrAuto::Calc(Box::new(calc)))
|
|
}
|
|
|
|
/// Parse a non-negative length, percentage, or auto.
|
|
#[inline]
|
|
pub fn parse_non_negative<'i, 't>(
|
|
context: &ParserContext,
|
|
input: &mut Parser<'i, 't>,
|
|
) -> Result<LengthOrPercentageOrAuto, ParseError<'i>> {
|
|
Self::parse_non_negative_quirky(context, input, AllowQuirks::No)
|
|
}
|
|
|
|
/// Parse a non-negative length, percentage, or auto.
|
|
#[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,
|
|
)
|
|
}
|
|
|
|
/// Returns the `auto` value.
|
|
pub fn auto() -> Self {
|
|
LengthOrPercentageOrAuto::Auto
|
|
}
|
|
|
|
/// Returns a value representing a `0` length.
|
|
pub fn zero() -> Self {
|
|
LengthOrPercentageOrAuto::Length(NoCalcLength::zero())
|
|
}
|
|
|
|
/// Returns a value representing `0%`.
|
|
#[inline]
|
|
pub fn zero_percent() -> Self {
|
|
LengthOrPercentageOrAuto::Percentage(computed::Percentage::zero())
|
|
}
|
|
|
|
/// Parses, with quirks.
|
|
#[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)
|
|
}
|
|
}
|
|
|
|
impl Parse for LengthOrPercentageOrAuto {
|
|
#[inline]
|
|
fn parse<'i, 't>(
|
|
context: &ParserContext,
|
|
input: &mut Parser<'i, 't>,
|
|
) -> Result<Self, ParseError<'i>> {
|
|
Self::parse_quirky(context, input, AllowQuirks::No)
|
|
}
|
|
}
|
|
|
|
/// A wrapper of LengthOrPercentageOrAuto, whose value must be >= 0.
|
|
pub type NonNegativeLengthOrPercentageOrAuto = NonNegative<LengthOrPercentageOrAuto>;
|
|
|
|
impl NonNegativeLengthOrPercentageOrAuto {
|
|
/// 0
|
|
#[inline]
|
|
pub fn zero() -> Self {
|
|
NonNegative(LengthOrPercentageOrAuto::zero())
|
|
}
|
|
|
|
/// 0%
|
|
#[inline]
|
|
pub fn zero_percent() -> Self {
|
|
NonNegative(LengthOrPercentageOrAuto::zero_percent())
|
|
}
|
|
|
|
/// `auto`
|
|
#[inline]
|
|
pub fn auto() -> Self {
|
|
NonNegative(LengthOrPercentageOrAuto::Auto)
|
|
}
|
|
}
|
|
|
|
impl Parse for NonNegativeLengthOrPercentageOrAuto {
|
|
#[inline]
|
|
fn parse<'i, 't>(
|
|
context: &ParserContext,
|
|
input: &mut Parser<'i, 't>,
|
|
) -> Result<Self, ParseError<'i>> {
|
|
Ok(NonNegative(LengthOrPercentageOrAuto::parse_non_negative(
|
|
context,
|
|
input,
|
|
)?))
|
|
}
|
|
}
|
|
|
|
/// Either a `<length>`, a `<percentage>`, or the `none` keyword.
|
|
#[derive(Clone, Debug, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToCss)]
|
|
#[allow(missing_docs)]
|
|
pub enum LengthOrPercentageOrNone {
|
|
Length(NoCalcLength),
|
|
Percentage(computed::Percentage),
|
|
Calc(Box<CalcLengthOrPercentage>),
|
|
None,
|
|
}
|
|
|
|
impl LengthOrPercentageOrNone {
|
|
fn parse_internal<'i, 't>(
|
|
context: &ParserContext,
|
|
input: &mut Parser<'i, 't>,
|
|
num_context: AllowedNumericType,
|
|
allow_quirks: AllowQuirks,
|
|
) -> Result<Self, ParseError<'i>> {
|
|
// FIXME: remove early returns when lifetimes are non-lexical
|
|
{
|
|
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(LengthOrPercentageOrNone::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(LengthOrPercentageOrNone::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_custom_error(StyleParseErrorKind::UnspecifiedError));
|
|
}
|
|
return Ok(LengthOrPercentageOrNone::Length(NoCalcLength::Absolute(
|
|
AbsoluteLength::Px(value),
|
|
)));
|
|
},
|
|
Token::Function(ref name) if name.eq_ignore_ascii_case("calc") => {},
|
|
Token::Ident(ref value) if value.eq_ignore_ascii_case("none") => {
|
|
return Ok(LengthOrPercentageOrNone::None)
|
|
},
|
|
_ => return Err(location.new_unexpected_token_error(token.clone())),
|
|
}
|
|
}
|
|
|
|
let calc = input
|
|
.parse_nested_block(|i| CalcNode::parse_length_or_percentage(context, i, num_context))?;
|
|
Ok(LengthOrPercentageOrNone::Calc(Box::new(calc)))
|
|
}
|
|
|
|
/// Parse a non-negative LengthOrPercentageOrNone.
|
|
#[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 LengthOrPercentageOrNone, 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 Parse for LengthOrPercentageOrNone {
|
|
#[inline]
|
|
fn parse<'i, 't>(
|
|
context: &ParserContext,
|
|
input: &mut Parser<'i, 't>,
|
|
) -> Result<Self, ParseError<'i>> {
|
|
Self::parse_internal(context, input, AllowedNumericType::All, AllowQuirks::No)
|
|
}
|
|
}
|
|
|
|
/// A wrapper of LengthOrPercentage, whose value must be >= 0.
|
|
pub type NonNegativeLengthOrPercentage = NonNegative<LengthOrPercentage>;
|
|
|
|
/// Either a computed NonNegativeLength or the `normal` keyword.
|
|
pub type NonNegativeLengthOrNormal = Either<NonNegativeLength, Normal>;
|
|
|
|
/// Either a NonNegativeLengthOrPercentage or the `normal` keyword.
|
|
pub type NonNegativeLengthOrPercentageOrNormal = Either<NonNegativeLengthOrPercentage, Normal>;
|
|
|
|
impl From<NoCalcLength> for NonNegativeLengthOrPercentage {
|
|
#[inline]
|
|
fn from(len: NoCalcLength) -> Self {
|
|
NonNegative::<LengthOrPercentage>(LengthOrPercentage::from(len))
|
|
}
|
|
}
|
|
|
|
impl Parse for NonNegativeLengthOrPercentage {
|
|
#[inline]
|
|
fn parse<'i, 't>(
|
|
context: &ParserContext,
|
|
input: &mut Parser<'i, 't>,
|
|
) -> Result<Self, ParseError<'i>> {
|
|
LengthOrPercentage::parse_non_negative(context, input)
|
|
.map(NonNegative::<LengthOrPercentage>)
|
|
}
|
|
}
|
|
|
|
impl NonNegativeLengthOrPercentage {
|
|
#[inline]
|
|
/// Returns a `zero` length.
|
|
pub fn zero() -> Self {
|
|
NonNegative::<LengthOrPercentage>(LengthOrPercentage::zero())
|
|
}
|
|
|
|
/// 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>> {
|
|
LengthOrPercentage::parse_non_negative_quirky(context, input, allow_quirks)
|
|
.map(NonNegative::<LengthOrPercentage>)
|
|
}
|
|
}
|
|
|
|
/// Either a `<length>` or the `normal` keyword.
|
|
pub type LengthOrNormal = Either<Length, Normal>;
|
|
|
|
/// Either a `<length>` or the `auto` keyword.
|
|
pub type LengthOrAuto = Either<Length, Auto>;
|
|
|
|
/// Either a `<length>` or a `<number>`.
|
|
pub type LengthOrNumber = Either<Length, Number>;
|
|
|
|
impl LengthOrNumber {
|
|
/// Parse a non-negative LengthOrNumber.
|
|
pub fn parse_non_negative<'i, 't>(
|
|
context: &ParserContext,
|
|
input: &mut Parser<'i, 't>,
|
|
) -> Result<Self, ParseError<'i>> {
|
|
// We try to parse as a Number first because, for cases like
|
|
// LengthOrNumber, we want "0" to be parsed as a plain Number rather
|
|
// than a Length (0px); this matches the behaviour of all major browsers
|
|
if let Ok(v) = input.try(|i| Number::parse_non_negative(context, i)) {
|
|
return Ok(Either::Second(v));
|
|
}
|
|
|
|
Length::parse_non_negative(context, input).map(Either::First)
|
|
}
|
|
|
|
/// Returns `0`.
|
|
#[inline]
|
|
pub fn zero() -> Self {
|
|
Either::Second(Number::new(0.))
|
|
}
|
|
}
|
|
|
|
/// A value suitable for a `min-width` or `min-height` property.
|
|
///
|
|
/// Unlike `max-width` or `max-height` properties, a MozLength can be `auto`,
|
|
/// and cannot be `none`.
|
|
///
|
|
/// Note that it only accepts non-negative values.
|
|
#[allow(missing_docs)]
|
|
#[derive(Clone, Debug, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToCss)]
|
|
pub enum MozLength {
|
|
LengthOrPercentageOrAuto(LengthOrPercentageOrAuto),
|
|
ExtremumLength(ExtremumLength),
|
|
}
|
|
|
|
impl Parse for MozLength {
|
|
fn parse<'i, 't>(
|
|
context: &ParserContext,
|
|
input: &mut Parser<'i, 't>,
|
|
) -> Result<Self, ParseError<'i>> {
|
|
MozLength::parse_quirky(context, input, AllowQuirks::No)
|
|
}
|
|
}
|
|
|
|
impl MozLength {
|
|
/// Parses, without quirks, and disallowing ExtremumLength values.
|
|
///
|
|
/// Used for logical props in the block direction.
|
|
pub fn parse_disallow_keyword<'i, 't>(
|
|
context: &ParserContext,
|
|
input: &mut Parser<'i, 't>,
|
|
) -> Result<Self, ParseError<'i>> {
|
|
let length = LengthOrPercentageOrAuto::parse_non_negative(context, input)?;
|
|
Ok(MozLength::LengthOrPercentageOrAuto(length))
|
|
}
|
|
|
|
/// Parses, with quirks.
|
|
pub fn parse_quirky<'i, 't>(
|
|
context: &ParserContext,
|
|
input: &mut Parser<'i, 't>,
|
|
allow_quirks: AllowQuirks,
|
|
) -> Result<Self, ParseError<'i>> {
|
|
if let Ok(l) = input.try(ExtremumLength::parse) {
|
|
return Ok(MozLength::ExtremumLength(l));
|
|
}
|
|
|
|
let length =
|
|
LengthOrPercentageOrAuto::parse_non_negative_quirky(context, input, allow_quirks)?;
|
|
Ok(MozLength::LengthOrPercentageOrAuto(length))
|
|
}
|
|
|
|
/// Returns `auto`.
|
|
#[inline]
|
|
pub fn auto() -> Self {
|
|
MozLength::LengthOrPercentageOrAuto(LengthOrPercentageOrAuto::auto())
|
|
}
|
|
|
|
/// Returns `0%`.
|
|
#[inline]
|
|
pub fn zero_percent() -> Self {
|
|
MozLength::LengthOrPercentageOrAuto(LengthOrPercentageOrAuto::zero_percent())
|
|
}
|
|
}
|
|
|
|
/// A value suitable for a `max-width` or `max-height` property.
|
|
#[allow(missing_docs)]
|
|
#[derive(Clone, Debug, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToCss)]
|
|
pub enum MaxLength {
|
|
LengthOrPercentageOrNone(LengthOrPercentageOrNone),
|
|
ExtremumLength(ExtremumLength),
|
|
}
|
|
|
|
impl Parse for MaxLength {
|
|
fn parse<'i, 't>(
|
|
context: &ParserContext,
|
|
input: &mut Parser<'i, 't>,
|
|
) -> Result<Self, ParseError<'i>> {
|
|
MaxLength::parse_quirky(context, input, AllowQuirks::No)
|
|
}
|
|
}
|
|
|
|
impl MaxLength {
|
|
/// Parses, without quirks, and disallowing ExtremumLength values.
|
|
///
|
|
/// Used for logical props in the block direction.
|
|
pub fn parse_disallow_keyword<'i, 't>(
|
|
context: &ParserContext,
|
|
input: &mut Parser<'i, 't>,
|
|
) -> Result<Self, ParseError<'i>> {
|
|
let length = LengthOrPercentageOrNone::parse_non_negative(context, input)?;
|
|
Ok(MaxLength::LengthOrPercentageOrNone(length))
|
|
}
|
|
|
|
/// Parses, with quirks.
|
|
pub fn parse_quirky<'i, 't>(
|
|
context: &ParserContext,
|
|
input: &mut Parser<'i, 't>,
|
|
allow_quirks: AllowQuirks,
|
|
) -> Result<Self, ParseError<'i>> {
|
|
if let Ok(l) = input.try(ExtremumLength::parse) {
|
|
return Ok(MaxLength::ExtremumLength(l));
|
|
}
|
|
|
|
let length =
|
|
LengthOrPercentageOrNone::parse_non_negative_quirky(context, input, allow_quirks)?;
|
|
Ok(MaxLength::LengthOrPercentageOrNone(length))
|
|
}
|
|
}
|