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servo/components/style/values/specified/font.rs
Emilio Cobos Álvarez 7a696cbffe
style: build / rebase fixes.
2020-06-18 23:51:17 +02:00

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
//! Specified values for font properties
#[cfg(feature = "gecko")]
use crate::gecko_bindings::bindings;
use crate::parser::{Parse, ParserContext};
use crate::properties::longhands::system_font::SystemFont;
use crate::values::computed::font::{FamilyName, FontFamilyList, FontStyleAngle, SingleFontFamily};
use crate::values::computed::{font as computed, Length, NonNegativeLength};
use crate::values::computed::{Angle as ComputedAngle, Percentage as ComputedPercentage};
use crate::values::computed::{CSSPixelLength, Context, ToComputedValue};
use crate::values::generics::font::VariationValue;
use crate::values::generics::font::{self as generics, FeatureTagValue, FontSettings, FontTag};
use crate::values::generics::NonNegative;
use crate::values::specified::length::{FontBaseSize, AU_PER_PT, AU_PER_PX};
use crate::values::specified::{AllowQuirks, Angle, Integer, LengthPercentage};
use crate::values::specified::{NoCalcLength, NonNegativeNumber, Number, Percentage};
use crate::values::CustomIdent;
use crate::Atom;
use cssparser::{Parser, Token};
#[cfg(feature = "gecko")]
use malloc_size_of::{MallocSizeOf, MallocSizeOfOps};
use std::fmt::{self, Write};
use style_traits::values::SequenceWriter;
use style_traits::{CssWriter, KeywordsCollectFn, ParseError};
use style_traits::{SpecifiedValueInfo, StyleParseErrorKind, ToCss};
// FIXME(emilio): The system font code is copy-pasta, and should be cleaned up.
macro_rules! system_font_methods {
($ty:ident, $field:ident) => {
system_font_methods!($ty);
fn compute_system(&self, _context: &Context) -> <$ty as ToComputedValue>::ComputedValue {
debug_assert!(matches!(*self, $ty::System(..)));
#[cfg(feature = "gecko")]
{
_context.cached_system_font.as_ref().unwrap().$field.clone()
}
#[cfg(feature = "servo")]
{
unreachable!()
}
}
};
($ty:ident) => {
/// Get a specified value that represents a system font.
pub fn system_font(f: SystemFont) -> Self {
$ty::System(f)
}
/// Retreive a SystemFont from the specified value.
pub fn get_system(&self) -> Option<SystemFont> {
if let $ty::System(s) = *self {
Some(s)
} else {
None
}
}
};
}
const DEFAULT_SCRIPT_MIN_SIZE_PT: u32 = 8;
const DEFAULT_SCRIPT_SIZE_MULTIPLIER: f64 = 0.71;
/// The minimum font-weight value per:
///
/// https://drafts.csswg.org/css-fonts-4/#font-weight-numeric-values
pub const MIN_FONT_WEIGHT: f32 = 1.;
/// The maximum font-weight value per:
///
/// https://drafts.csswg.org/css-fonts-4/#font-weight-numeric-values
pub const MAX_FONT_WEIGHT: f32 = 1000.;
/// A specified font-weight value.
///
/// https://drafts.csswg.org/css-fonts-4/#propdef-font-weight
#[derive(Clone, Copy, Debug, MallocSizeOf, Parse, PartialEq, SpecifiedValueInfo, ToCss, ToShmem)]
pub enum FontWeight {
/// `<font-weight-absolute>`
Absolute(AbsoluteFontWeight),
/// Bolder variant
Bolder,
/// Lighter variant
Lighter,
/// System font variant.
#[css(skip)]
System(SystemFont),
}
impl FontWeight {
system_font_methods!(FontWeight, font_weight);
/// `normal`
#[inline]
pub fn normal() -> Self {
FontWeight::Absolute(AbsoluteFontWeight::Normal)
}
/// Get a specified FontWeight from a gecko keyword
pub fn from_gecko_keyword(kw: u32) -> Self {
debug_assert!(kw % 100 == 0);
debug_assert!(kw as f32 <= MAX_FONT_WEIGHT);
FontWeight::Absolute(AbsoluteFontWeight::Weight(Number::new(kw as f32)))
}
}
impl ToComputedValue for FontWeight {
type ComputedValue = computed::FontWeight;
#[inline]
fn to_computed_value(&self, context: &Context) -> Self::ComputedValue {
match *self {
FontWeight::Absolute(ref abs) => abs.compute(),
FontWeight::Bolder => context
.builder
.get_parent_font()
.clone_font_weight()
.bolder(),
FontWeight::Lighter => context
.builder
.get_parent_font()
.clone_font_weight()
.lighter(),
FontWeight::System(_) => self.compute_system(context),
}
}
#[inline]
fn from_computed_value(computed: &computed::FontWeight) -> Self {
FontWeight::Absolute(AbsoluteFontWeight::Weight(Number::from_computed_value(
&computed.0,
)))
}
}
/// An absolute font-weight value for a @font-face rule.
///
/// https://drafts.csswg.org/css-fonts-4/#font-weight-absolute-values
#[derive(Clone, Copy, Debug, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToCss, ToShmem)]
pub enum AbsoluteFontWeight {
/// A `<number>`, with the additional constraints specified in:
///
/// https://drafts.csswg.org/css-fonts-4/#font-weight-numeric-values
Weight(Number),
/// Normal font weight. Same as 400.
Normal,
/// Bold font weight. Same as 700.
Bold,
}
impl AbsoluteFontWeight {
/// Returns the computed value for this absolute font weight.
pub fn compute(&self) -> computed::FontWeight {
match *self {
AbsoluteFontWeight::Weight(weight) => {
computed::FontWeight(weight.get().max(MIN_FONT_WEIGHT).min(MAX_FONT_WEIGHT))
},
AbsoluteFontWeight::Normal => computed::FontWeight::normal(),
AbsoluteFontWeight::Bold => computed::FontWeight::bold(),
}
}
}
impl Parse for AbsoluteFontWeight {
fn parse<'i, 't>(
context: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<Self, ParseError<'i>> {
if let Ok(number) = input.try_parse(|input| Number::parse(context, input)) {
// We could add another AllowedNumericType value, but it doesn't
// seem worth it just for a single property with such a weird range,
// so we do the clamping here manually.
if !number.was_calc() &&
(number.get() < MIN_FONT_WEIGHT || number.get() > MAX_FONT_WEIGHT)
{
return Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError));
}
return Ok(AbsoluteFontWeight::Weight(number));
}
Ok(try_match_ident_ignore_ascii_case! { input,
"normal" => AbsoluteFontWeight::Normal,
"bold" => AbsoluteFontWeight::Bold,
})
}
}
/// The specified value of the `font-style` property, without the system font
/// crap.
pub type SpecifiedFontStyle = generics::FontStyle<Angle>;
impl ToCss for SpecifiedFontStyle {
fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
where
W: Write,
{
match *self {
generics::FontStyle::Normal => dest.write_str("normal"),
generics::FontStyle::Italic => dest.write_str("italic"),
generics::FontStyle::Oblique(ref angle) => {
dest.write_str("oblique")?;
if *angle != Self::default_angle() {
dest.write_char(' ')?;
angle.to_css(dest)?;
}
Ok(())
},
}
}
}
impl Parse for SpecifiedFontStyle {
fn parse<'i, 't>(
context: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<Self, ParseError<'i>> {
Ok(try_match_ident_ignore_ascii_case! { input,
"normal" => generics::FontStyle::Normal,
"italic" => generics::FontStyle::Italic,
"oblique" => {
let angle = input.try_parse(|input| Self::parse_angle(context, input))
.unwrap_or_else(|_| Self::default_angle());
generics::FontStyle::Oblique(angle)
},
})
}
}
impl ToComputedValue for SpecifiedFontStyle {
type ComputedValue = computed::FontStyle;
fn to_computed_value(&self, _: &Context) -> Self::ComputedValue {
match *self {
generics::FontStyle::Normal => generics::FontStyle::Normal,
generics::FontStyle::Italic => generics::FontStyle::Italic,
generics::FontStyle::Oblique(ref angle) => {
generics::FontStyle::Oblique(FontStyleAngle(Self::compute_angle(angle)))
},
}
}
fn from_computed_value(computed: &Self::ComputedValue) -> Self {
match *computed {
generics::FontStyle::Normal => generics::FontStyle::Normal,
generics::FontStyle::Italic => generics::FontStyle::Italic,
generics::FontStyle::Oblique(ref angle) => {
generics::FontStyle::Oblique(Angle::from_computed_value(&angle.0))
},
}
}
}
/// The default angle for `font-style: oblique`.
///
/// NOTE(emilio): As of right now this diverges from the spec, which specifies
/// 20, because it's not updated yet to account for the resolution in:
///
/// https://github.com/w3c/csswg-drafts/issues/2295
pub const DEFAULT_FONT_STYLE_OBLIQUE_ANGLE_DEGREES: f32 = 14.;
/// From https://drafts.csswg.org/css-fonts-4/#valdef-font-style-oblique-angle:
///
/// Values less than -90deg or values greater than 90deg are
/// invalid and are treated as parse errors.
///
/// The maximum angle value that `font-style: oblique` should compute to.
pub const FONT_STYLE_OBLIQUE_MAX_ANGLE_DEGREES: f32 = 90.;
/// The minimum angle value that `font-style: oblique` should compute to.
pub const FONT_STYLE_OBLIQUE_MIN_ANGLE_DEGREES: f32 = -90.;
impl SpecifiedFontStyle {
/// Gets a clamped angle in degrees from a specified Angle.
pub fn compute_angle_degrees(angle: &Angle) -> f32 {
angle
.degrees()
.max(FONT_STYLE_OBLIQUE_MIN_ANGLE_DEGREES)
.min(FONT_STYLE_OBLIQUE_MAX_ANGLE_DEGREES)
}
fn compute_angle(angle: &Angle) -> ComputedAngle {
ComputedAngle::from_degrees(Self::compute_angle_degrees(angle))
}
/// Parse a suitable angle for font-style: oblique.
pub fn parse_angle<'i, 't>(
context: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<Angle, ParseError<'i>> {
let angle = Angle::parse(context, input)?;
if angle.was_calc() {
return Ok(angle);
}
let degrees = angle.degrees();
if degrees < FONT_STYLE_OBLIQUE_MIN_ANGLE_DEGREES ||
degrees > FONT_STYLE_OBLIQUE_MAX_ANGLE_DEGREES
{
return Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError));
}
return Ok(angle);
}
/// The default angle for `font-style: oblique`.
pub fn default_angle() -> Angle {
Angle::from_degrees(
DEFAULT_FONT_STYLE_OBLIQUE_ANGLE_DEGREES,
/* was_calc = */ false,
)
}
}
/// The specified value of the `font-style` property.
#[derive(Clone, Copy, Debug, MallocSizeOf, Parse, PartialEq, SpecifiedValueInfo, ToCss, ToShmem)]
#[allow(missing_docs)]
pub enum FontStyle {
Specified(SpecifiedFontStyle),
#[css(skip)]
System(SystemFont),
}
impl FontStyle {
/// Return the `normal` value.
#[inline]
pub fn normal() -> Self {
FontStyle::Specified(generics::FontStyle::Normal)
}
system_font_methods!(FontStyle, font_style);
}
impl ToComputedValue for FontStyle {
type ComputedValue = computed::FontStyle;
fn to_computed_value(&self, context: &Context) -> Self::ComputedValue {
match *self {
FontStyle::Specified(ref specified) => specified.to_computed_value(context),
FontStyle::System(..) => self.compute_system(context),
}
}
fn from_computed_value(computed: &Self::ComputedValue) -> Self {
FontStyle::Specified(SpecifiedFontStyle::from_computed_value(computed))
}
}
/// A value for the `font-stretch` property.
///
/// https://drafts.csswg.org/css-fonts-4/#font-stretch-prop
///
/// TODO(emilio): We could derive Parse if we had NonNegativePercentage.
#[allow(missing_docs)]
#[derive(Clone, Copy, Debug, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToCss, ToShmem)]
#[repr(u8)]
pub enum FontStretch {
Stretch(Percentage),
Keyword(FontStretchKeyword),
#[css(skip)]
System(SystemFont),
}
/// A keyword value for `font-stretch`.
#[derive(Clone, Copy, Debug, MallocSizeOf, Parse, PartialEq, SpecifiedValueInfo, ToCss, ToShmem)]
#[allow(missing_docs)]
pub enum FontStretchKeyword {
Normal,
Condensed,
UltraCondensed,
ExtraCondensed,
SemiCondensed,
SemiExpanded,
Expanded,
ExtraExpanded,
UltraExpanded,
}
impl FontStretchKeyword {
/// Resolves the value of the keyword as specified in:
///
/// https://drafts.csswg.org/css-fonts-4/#font-stretch-prop
pub fn compute(&self) -> ComputedPercentage {
use self::FontStretchKeyword::*;
ComputedPercentage(match *self {
UltraCondensed => 0.5,
ExtraCondensed => 0.625,
Condensed => 0.75,
SemiCondensed => 0.875,
Normal => 1.,
SemiExpanded => 1.125,
Expanded => 1.25,
ExtraExpanded => 1.5,
UltraExpanded => 2.,
})
}
/// Does the opposite operation to `compute`, in order to serialize keywords
/// if possible.
pub fn from_percentage(percentage: f32) -> Option<Self> {
use self::FontStretchKeyword::*;
// NOTE(emilio): Can't use `match` because of rust-lang/rust#41620.
if percentage == 0.5 {
return Some(UltraCondensed);
}
if percentage == 0.625 {
return Some(ExtraCondensed);
}
if percentage == 0.75 {
return Some(Condensed);
}
if percentage == 0.875 {
return Some(SemiCondensed);
}
if percentage == 1. {
return Some(Normal);
}
if percentage == 1.125 {
return Some(SemiExpanded);
}
if percentage == 1.25 {
return Some(Expanded);
}
if percentage == 1.5 {
return Some(ExtraExpanded);
}
if percentage == 2. {
return Some(UltraExpanded);
}
None
}
}
impl FontStretch {
/// `normal`.
pub fn normal() -> Self {
FontStretch::Keyword(FontStretchKeyword::Normal)
}
system_font_methods!(FontStretch, font_stretch);
}
impl Parse for FontStretch {
fn parse<'i, 't>(
context: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<Self, ParseError<'i>> {
// From https://drafts.csswg.org/css-fonts-4/#font-stretch-prop:
//
// Values less than 0% are not allowed and are treated as parse
// errors.
if let Ok(percentage) =
input.try_parse(|input| Percentage::parse_non_negative(context, input))
{
return Ok(FontStretch::Stretch(percentage));
}
Ok(FontStretch::Keyword(FontStretchKeyword::parse(input)?))
}
}
impl ToComputedValue for FontStretch {
type ComputedValue = computed::FontStretch;
fn to_computed_value(&self, context: &Context) -> Self::ComputedValue {
match *self {
FontStretch::Stretch(ref percentage) => {
computed::FontStretch(NonNegative(percentage.to_computed_value(context)))
},
FontStretch::Keyword(ref kw) => computed::FontStretch(NonNegative(kw.compute())),
FontStretch::System(_) => self.compute_system(context),
}
}
fn from_computed_value(computed: &Self::ComputedValue) -> Self {
FontStretch::Stretch(Percentage::from_computed_value(&(computed.0).0))
}
}
/// CSS font keywords
#[derive(
Animate,
Clone,
ComputeSquaredDistance,
Copy,
Debug,
MallocSizeOf,
Parse,
PartialEq,
SpecifiedValueInfo,
ToAnimatedValue,
ToAnimatedZero,
ToComputedValue,
ToCss,
ToResolvedValue,
ToShmem,
Serialize,
Deserialize,
)]
#[allow(missing_docs)]
#[repr(u8)]
pub enum FontSizeKeyword {
#[css(keyword = "xx-small")]
XXSmall,
XSmall,
Small,
Medium,
Large,
XLarge,
#[css(keyword = "xx-large")]
XXLarge,
#[css(keyword = "xxx-large")]
XXXLarge,
#[css(skip)]
None,
}
impl FontSizeKeyword {
/// Convert to an HTML <font size> value
#[inline]
pub fn html_size(self) -> u8 {
self as u8
}
}
impl Default for FontSizeKeyword {
fn default() -> Self {
FontSizeKeyword::Medium
}
}
#[derive(
Animate,
Clone,
ComputeSquaredDistance,
Copy,
Debug,
MallocSizeOf,
PartialEq,
ToAnimatedValue,
ToAnimatedZero,
ToComputedValue,
ToCss,
ToResolvedValue,
ToShmem,
)]
#[cfg_attr(feature = "servo", derive(Serialize, Deserialize))]
/// Additional information for keyword-derived font sizes.
pub struct KeywordInfo {
/// The keyword used
pub kw: FontSizeKeyword,
/// A factor to be multiplied by the computed size of the keyword
#[css(skip)]
pub factor: f32,
/// An additional fixed offset to add to the kw * factor in the case of
/// `calc()`.
#[css(skip)]
pub offset: CSSPixelLength,
}
impl KeywordInfo {
/// KeywordInfo value for font-size: medium
pub fn medium() -> Self {
Self::new(FontSizeKeyword::Medium)
}
/// KeywordInfo value for font-size: none
pub fn none() -> Self {
Self::new(FontSizeKeyword::None)
}
fn new(kw: FontSizeKeyword) -> Self {
KeywordInfo {
kw,
factor: 1.,
offset: CSSPixelLength::new(0.),
}
}
/// Computes the final size for this font-size keyword, accounting for
/// text-zoom.
fn to_computed_value(&self, context: &Context) -> CSSPixelLength {
debug_assert_ne!(self.kw, FontSizeKeyword::None);
let base = context.maybe_zoom_text(self.kw.to_length(context).0);
base * self.factor + context.maybe_zoom_text(self.offset)
}
/// Given a parent keyword info (self), apply an additional factor/offset to
/// it.
fn compose(self, factor: f32) -> Self {
if self.kw == FontSizeKeyword::None {
return self;
}
KeywordInfo {
kw: self.kw,
factor: self.factor * factor,
offset: self.offset * factor,
}
}
}
impl SpecifiedValueInfo for KeywordInfo {
fn collect_completion_keywords(f: KeywordsCollectFn) {
<FontSizeKeyword as SpecifiedValueInfo>::collect_completion_keywords(f);
}
}
#[derive(Clone, Debug, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToCss, ToShmem)]
/// A specified font-size value
pub enum FontSize {
/// A length; e.g. 10px.
Length(LengthPercentage),
/// A keyword value, along with a ratio and absolute offset.
/// The ratio in any specified keyword value
/// will be 1 (with offset 0), but we cascade keywordness even
/// after font-relative (percent and em) values
/// have been applied, which is where the ratio
/// comes in. The offset comes in if we cascaded a calc value,
/// where the font-relative portion (em and percentage) will
/// go into the ratio, and the remaining units all computed together
/// will go into the offset.
/// See bug 1355707.
Keyword(KeywordInfo),
/// font-size: smaller
Smaller,
/// font-size: larger
Larger,
/// Derived from a specified system font.
#[css(skip)]
System(SystemFont),
}
/// Specifies a prioritized list of font family names or generic family names.
#[derive(Clone, Debug, Eq, PartialEq, ToCss, ToShmem)]
#[cfg_attr(feature = "servo", derive(Hash))]
pub enum FontFamily {
/// List of `font-family`
#[css(comma)]
Values(#[css(iterable)] FontFamilyList),
/// System font
#[css(skip)]
System(SystemFont),
}
impl FontFamily {
system_font_methods!(FontFamily, font_family);
/// Parse a specified font-family value
pub fn parse_specified<'i, 't>(input: &mut Parser<'i, 't>) -> Result<Self, ParseError<'i>> {
let values = input.parse_comma_separated(SingleFontFamily::parse)?;
Ok(FontFamily::Values(FontFamilyList::new(
values.into_boxed_slice(),
)))
}
}
impl ToComputedValue for FontFamily {
type ComputedValue = computed::FontFamily;
fn to_computed_value(&self, context: &Context) -> Self::ComputedValue {
match *self {
FontFamily::Values(ref v) => computed::FontFamily {
families: v.clone(),
is_system_font: false,
},
FontFamily::System(_) => self.compute_system(context),
}
}
fn from_computed_value(other: &computed::FontFamily) -> Self {
FontFamily::Values(other.families.clone())
}
}
#[cfg(feature = "gecko")]
impl MallocSizeOf for FontFamily {
fn size_of(&self, _ops: &mut MallocSizeOfOps) -> usize {
match *self {
FontFamily::Values(ref v) => {
// Although a SharedFontList object is refcounted, we always
// attribute its size to the specified value, as long as it's
// not a value in SharedFontList::sSingleGenerics.
if matches!(v, FontFamilyList::SharedFontList(_)) {
let ptr = v.shared_font_list().get();
unsafe { bindings::Gecko_SharedFontList_SizeOfIncludingThis(ptr) }
} else {
0
}
},
FontFamily::System(_) => 0,
}
}
}
impl Parse for FontFamily {
/// <family-name>#
/// <family-name> = <string> | [ <ident>+ ]
/// TODO: <generic-family>
fn parse<'i, 't>(
_: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<FontFamily, ParseError<'i>> {
FontFamily::parse_specified(input)
}
}
impl SpecifiedValueInfo for FontFamily {}
/// `FamilyName::parse` is based on `SingleFontFamily::parse` and not the other way around
/// because we want the former to exclude generic family keywords.
impl Parse for FamilyName {
fn parse<'i, 't>(
_: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<Self, ParseError<'i>> {
match SingleFontFamily::parse(input) {
Ok(SingleFontFamily::FamilyName(name)) => Ok(name),
Ok(SingleFontFamily::Generic(_)) => {
Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError))
},
Err(e) => Err(e),
}
}
}
#[derive(Clone, Copy, Debug, MallocSizeOf, Parse, PartialEq, SpecifiedValueInfo, ToCss, ToShmem)]
/// Preserve the readability of text when font fallback occurs
pub enum FontSizeAdjust {
/// None variant
None,
/// Number variant
Number(NonNegativeNumber),
/// system font
#[css(skip)]
System(SystemFont),
}
impl FontSizeAdjust {
#[inline]
/// Default value of font-size-adjust
pub fn none() -> Self {
FontSizeAdjust::None
}
system_font_methods!(FontSizeAdjust, font_size_adjust);
}
impl ToComputedValue for FontSizeAdjust {
type ComputedValue = computed::FontSizeAdjust;
fn to_computed_value(&self, context: &Context) -> Self::ComputedValue {
match *self {
FontSizeAdjust::None => computed::FontSizeAdjust::None,
FontSizeAdjust::Number(ref n) => {
// The computed version handles clamping of animated values
// itself.
computed::FontSizeAdjust::Number(n.to_computed_value(context).0)
},
FontSizeAdjust::System(_) => self.compute_system(context),
}
}
fn from_computed_value(computed: &computed::FontSizeAdjust) -> Self {
match *computed {
computed::FontSizeAdjust::None => FontSizeAdjust::None,
computed::FontSizeAdjust::Number(v) => {
FontSizeAdjust::Number(NonNegativeNumber::from_computed_value(&v.into()))
},
}
}
}
/// This is the ratio applied for font-size: larger
/// and smaller by both Firefox and Chrome
const LARGER_FONT_SIZE_RATIO: f32 = 1.2;
/// The default font size.
pub const FONT_MEDIUM_PX: i32 = 16;
impl FontSizeKeyword {
#[inline]
#[cfg(feature = "servo")]
fn to_length(&self, _: &Context) -> NonNegativeLength {
let medium = Length::new(FONT_MEDIUM_PX as f32);
// https://drafts.csswg.org/css-fonts-3/#font-size-prop
NonNegative(match *self {
FontSizeKeyword::XXSmall => medium * 3.0 / 5.0,
FontSizeKeyword::XSmall => medium * 3.0 / 4.0,
FontSizeKeyword::Small => medium * 8.0 / 9.0,
FontSizeKeyword::Medium => medium,
FontSizeKeyword::Large => medium * 6.0 / 5.0,
FontSizeKeyword::XLarge => medium * 3.0 / 2.0,
FontSizeKeyword::XXLarge => medium * 2.0,
FontSizeKeyword::XXXLarge => medium * 3.0,
FontSizeKeyword::None => unreachable!(),
})
}
#[cfg(feature = "gecko")]
#[inline]
fn to_length(&self, cx: &Context) -> NonNegativeLength {
use crate::context::QuirksMode;
// The tables in this function are originally from
// nsRuleNode::CalcFontPointSize in Gecko:
//
// https://searchfox.org/mozilla-central/rev/c05d9d61188d32b8/layout/style/nsRuleNode.cpp#3150
//
// Mapping from base size and HTML size to pixels
// The first index is (base_size - 9), the second is the
// HTML size. "0" is CSS keyword xx-small, not HTML size 0,
// since HTML size 0 is the same as 1.
//
// xxs xs s m l xl xxl -
// - 0/1 2 3 4 5 6 7
static FONT_SIZE_MAPPING: [[i32; 8]; 8] = [
[9, 9, 9, 9, 11, 14, 18, 27],
[9, 9, 9, 10, 12, 15, 20, 30],
[9, 9, 10, 11, 13, 17, 22, 33],
[9, 9, 10, 12, 14, 18, 24, 36],
[9, 10, 12, 13, 16, 20, 26, 39],
[9, 10, 12, 14, 17, 21, 28, 42],
[9, 10, 13, 15, 18, 23, 30, 45],
[9, 10, 13, 16, 18, 24, 32, 48],
];
// This table gives us compatibility with WinNav4 for the default fonts only.
// In WinNav4, the default fonts were:
//
// Times/12pt == Times/16px at 96ppi
// Courier/10pt == Courier/13px at 96ppi
//
// xxs xs s m l xl xxl -
// - 1 2 3 4 5 6 7
static QUIRKS_FONT_SIZE_MAPPING: [[i32; 8]; 8] = [
[9, 9, 9, 9, 11, 14, 18, 28],
[9, 9, 9, 10, 12, 15, 20, 31],
[9, 9, 9, 11, 13, 17, 22, 34],
[9, 9, 10, 12, 14, 18, 24, 37],
[9, 9, 10, 13, 16, 20, 26, 40],
[9, 9, 11, 14, 17, 21, 28, 42],
[9, 10, 12, 15, 17, 23, 30, 45],
[9, 10, 13, 16, 18, 24, 32, 48],
];
static FONT_SIZE_FACTORS: [i32; 8] = [60, 75, 89, 100, 120, 150, 200, 300];
let ref gecko_font = cx.style().get_font().gecko();
let base_size = unsafe {
Atom::with(gecko_font.mLanguage.mRawPtr, |atom| {
cx.font_metrics_provider
.get_size(atom, gecko_font.mGenericID)
})
};
let base_size_px = base_size.px().round() as i32;
let html_size = self.html_size() as usize;
NonNegative(if base_size_px >= 9 && base_size_px <= 16 {
let mapping = if cx.quirks_mode == QuirksMode::Quirks {
QUIRKS_FONT_SIZE_MAPPING
} else {
FONT_SIZE_MAPPING
};
Length::new(mapping[(base_size_px - 9) as usize][html_size] as f32)
} else {
base_size * FONT_SIZE_FACTORS[html_size] as f32 / 100.0
})
}
}
impl FontSize {
/// <https://html.spec.whatwg.org/multipage/#rules-for-parsing-a-legacy-font-size>
pub fn from_html_size(size: u8) -> Self {
FontSize::Keyword(KeywordInfo::new(match size {
// If value is less than 1, let it be 1.
0 | 1 => FontSizeKeyword::XSmall,
2 => FontSizeKeyword::Small,
3 => FontSizeKeyword::Medium,
4 => FontSizeKeyword::Large,
5 => FontSizeKeyword::XLarge,
6 => FontSizeKeyword::XXLarge,
// If value is greater than 7, let it be 7.
_ => FontSizeKeyword::XXXLarge,
}))
}
/// Compute it against a given base font size
pub fn to_computed_value_against(
&self,
context: &Context,
base_size: FontBaseSize,
) -> computed::FontSize {
use crate::values::specified::length::FontRelativeLength;
let compose_keyword = |factor| {
context
.style()
.get_parent_font()
.clone_font_size()
.keyword_info
.compose(factor)
};
let mut info = KeywordInfo::none();
let size = match *self {
FontSize::Length(LengthPercentage::Length(NoCalcLength::FontRelative(value))) => {
if let FontRelativeLength::Em(em) = value {
// If the parent font was keyword-derived, this is too.
// Tack the em unit onto the factor
info = compose_keyword(em);
}
value.to_computed_value(context, base_size)
},
FontSize::Length(LengthPercentage::Length(NoCalcLength::ServoCharacterWidth(
value,
))) => value.to_computed_value(base_size.resolve(context)),
FontSize::Length(LengthPercentage::Length(NoCalcLength::Absolute(ref l))) => {
context.maybe_zoom_text(l.to_computed_value(context))
},
FontSize::Length(LengthPercentage::Length(ref l)) => l.to_computed_value(context),
FontSize::Length(LengthPercentage::Percentage(pc)) => {
// If the parent font was keyword-derived, this is too.
// Tack the % onto the factor
info = compose_keyword(pc.0);
base_size.resolve(context) * pc.0
},
FontSize::Length(LengthPercentage::Calc(ref calc)) => {
let calc = calc.to_computed_value_zoomed(context, base_size);
calc.resolve(base_size.resolve(context))
},
FontSize::Keyword(i) => {
// As a specified keyword, this is keyword derived
info = i;
i.to_computed_value(context).clamp_to_non_negative()
},
FontSize::Smaller => {
info = compose_keyword(1. / LARGER_FONT_SIZE_RATIO);
FontRelativeLength::Em(1. / LARGER_FONT_SIZE_RATIO)
.to_computed_value(context, base_size)
},
FontSize::Larger => {
info = compose_keyword(LARGER_FONT_SIZE_RATIO);
FontRelativeLength::Em(LARGER_FONT_SIZE_RATIO).to_computed_value(context, base_size)
},
FontSize::System(_) => {
#[cfg(feature = "servo")]
{
unreachable!()
}
#[cfg(feature = "gecko")]
{
context
.cached_system_font
.as_ref()
.unwrap()
.font_size
.size
.0
}
},
};
computed::FontSize {
size: NonNegative(size),
keyword_info: info,
}
}
}
impl ToComputedValue for FontSize {
type ComputedValue = computed::FontSize;
#[inline]
fn to_computed_value(&self, context: &Context) -> computed::FontSize {
self.to_computed_value_against(context, FontBaseSize::InheritedStyle)
}
#[inline]
fn from_computed_value(computed: &computed::FontSize) -> Self {
FontSize::Length(LengthPercentage::Length(
ToComputedValue::from_computed_value(&computed.size.0),
))
}
}
impl FontSize {
system_font_methods!(FontSize);
/// Get initial value for specified font size.
#[inline]
pub fn medium() -> Self {
FontSize::Keyword(KeywordInfo::medium())
}
/// Parses a font-size, with quirks.
pub fn parse_quirky<'i, 't>(
context: &ParserContext,
input: &mut Parser<'i, 't>,
allow_quirks: AllowQuirks,
) -> Result<FontSize, ParseError<'i>> {
if let Ok(lp) = input
.try_parse(|i| LengthPercentage::parse_non_negative_quirky(context, i, allow_quirks))
{
return Ok(FontSize::Length(lp));
}
if let Ok(kw) = input.try_parse(FontSizeKeyword::parse) {
return Ok(FontSize::Keyword(KeywordInfo::new(kw)));
}
try_match_ident_ignore_ascii_case! { input,
"smaller" => Ok(FontSize::Smaller),
"larger" => Ok(FontSize::Larger),
}
}
}
impl Parse for FontSize {
/// <length> | <percentage> | <absolute-size> | <relative-size>
fn parse<'i, 't>(
context: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<FontSize, ParseError<'i>> {
FontSize::parse_quirky(context, input, AllowQuirks::No)
}
}
bitflags! {
#[cfg_attr(feature = "servo", derive(MallocSizeOf))]
/// Flags of variant alternates in bit
struct VariantAlternatesParsingFlags: u8 {
/// None of variant alternates enabled
const NORMAL = 0;
/// Historical forms
const HISTORICAL_FORMS = 0x01;
/// Stylistic Alternates
const STYLISTIC = 0x02;
/// Stylistic Sets
const STYLESET = 0x04;
/// Character Variant
const CHARACTER_VARIANT = 0x08;
/// Swash glyphs
const SWASH = 0x10;
/// Ornaments glyphs
const ORNAMENTS = 0x20;
/// Annotation forms
const ANNOTATION = 0x40;
}
}
#[derive(
Clone, Debug, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToCss, ToResolvedValue, ToShmem,
)]
#[repr(C, u8)]
/// Set of variant alternates
pub enum VariantAlternates {
/// Enables display of stylistic alternates
#[css(function)]
Stylistic(CustomIdent),
/// Enables display with stylistic sets
#[css(comma, function)]
Styleset(#[css(iterable)] crate::OwnedSlice<CustomIdent>),
/// Enables display of specific character variants
#[css(comma, function)]
CharacterVariant(#[css(iterable)] crate::OwnedSlice<CustomIdent>),
/// Enables display of swash glyphs
#[css(function)]
Swash(CustomIdent),
/// Enables replacement of default glyphs with ornaments
#[css(function)]
Ornaments(CustomIdent),
/// Enables display of alternate annotation forms
#[css(function)]
Annotation(CustomIdent),
/// Enables display of historical forms
HistoricalForms,
}
#[derive(
Clone,
Debug,
Default,
MallocSizeOf,
PartialEq,
SpecifiedValueInfo,
ToCss,
ToResolvedValue,
ToShmem,
)]
#[repr(transparent)]
/// List of Variant Alternates
pub struct VariantAlternatesList(
#[css(if_empty = "normal", iterable)] crate::OwnedSlice<VariantAlternates>,
);
impl VariantAlternatesList {
/// Returns the length of all variant alternates.
pub fn len(&self) -> usize {
self.0.iter().fold(0, |acc, alternate| match *alternate {
VariantAlternates::Swash(_) |
VariantAlternates::Stylistic(_) |
VariantAlternates::Ornaments(_) |
VariantAlternates::Annotation(_) => acc + 1,
VariantAlternates::Styleset(ref slice) |
VariantAlternates::CharacterVariant(ref slice) => acc + slice.len(),
_ => acc,
})
}
}
#[derive(Clone, Debug, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToCss, ToShmem)]
/// Control over the selection of these alternate glyphs
pub enum FontVariantAlternates {
/// Use alternative glyph from value
Value(VariantAlternatesList),
/// Use system font glyph
#[css(skip)]
System(SystemFont),
}
impl FontVariantAlternates {
#[inline]
/// Get initial specified value with VariantAlternatesList
pub fn get_initial_specified_value() -> Self {
FontVariantAlternates::Value(Default::default())
}
system_font_methods!(FontVariantAlternates, font_variant_alternates);
}
impl ToComputedValue for FontVariantAlternates {
type ComputedValue = computed::FontVariantAlternates;
fn to_computed_value(&self, context: &Context) -> computed::FontVariantAlternates {
match *self {
FontVariantAlternates::Value(ref v) => v.clone(),
FontVariantAlternates::System(_) => self.compute_system(context),
}
}
fn from_computed_value(other: &computed::FontVariantAlternates) -> Self {
FontVariantAlternates::Value(other.clone())
}
}
impl Parse for FontVariantAlternates {
/// normal |
/// [ stylistic(<feature-value-name>) ||
/// historical-forms ||
/// styleset(<feature-value-name> #) ||
/// character-variant(<feature-value-name> #) ||
/// swash(<feature-value-name>) ||
/// ornaments(<feature-value-name>) ||
/// annotation(<feature-value-name>) ]
fn parse<'i, 't>(
_: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<FontVariantAlternates, ParseError<'i>> {
if input
.try_parse(|input| input.expect_ident_matching("normal"))
.is_ok()
{
return Ok(FontVariantAlternates::Value(Default::default()));
}
let mut alternates = Vec::new();
let mut parsed_alternates = VariantAlternatesParsingFlags::empty();
macro_rules! check_if_parsed(
($input:expr, $flag:path) => (
if parsed_alternates.contains($flag) {
return Err($input.new_custom_error(StyleParseErrorKind::UnspecifiedError))
}
parsed_alternates |= $flag;
)
);
while let Ok(_) = input.try_parse(|input| match *input.next()? {
Token::Ident(ref value) if value.eq_ignore_ascii_case("historical-forms") => {
check_if_parsed!(input, VariantAlternatesParsingFlags::HISTORICAL_FORMS);
alternates.push(VariantAlternates::HistoricalForms);
Ok(())
},
Token::Function(ref name) => {
let name = name.clone();
input.parse_nested_block(|i| {
match_ignore_ascii_case! { &name,
"swash" => {
check_if_parsed!(i, VariantAlternatesParsingFlags::SWASH);
let location = i.current_source_location();
let ident = CustomIdent::from_ident(location, i.expect_ident()?, &[])?;
alternates.push(VariantAlternates::Swash(ident));
Ok(())
},
"stylistic" => {
check_if_parsed!(i, VariantAlternatesParsingFlags::STYLISTIC);
let location = i.current_source_location();
let ident = CustomIdent::from_ident(location, i.expect_ident()?, &[])?;
alternates.push(VariantAlternates::Stylistic(ident));
Ok(())
},
"ornaments" => {
check_if_parsed!(i, VariantAlternatesParsingFlags::ORNAMENTS);
let location = i.current_source_location();
let ident = CustomIdent::from_ident(location, i.expect_ident()?, &[])?;
alternates.push(VariantAlternates::Ornaments(ident));
Ok(())
},
"annotation" => {
check_if_parsed!(i, VariantAlternatesParsingFlags::ANNOTATION);
let location = i.current_source_location();
let ident = CustomIdent::from_ident(location, i.expect_ident()?, &[])?;
alternates.push(VariantAlternates::Annotation(ident));
Ok(())
},
"styleset" => {
check_if_parsed!(i, VariantAlternatesParsingFlags::STYLESET);
let idents = i.parse_comma_separated(|i| {
let location = i.current_source_location();
CustomIdent::from_ident(location, i.expect_ident()?, &[])
})?;
alternates.push(VariantAlternates::Styleset(idents.into()));
Ok(())
},
"character-variant" => {
check_if_parsed!(i, VariantAlternatesParsingFlags::CHARACTER_VARIANT);
let idents = i.parse_comma_separated(|i| {
let location = i.current_source_location();
CustomIdent::from_ident(location, i.expect_ident()?, &[])
})?;
alternates.push(VariantAlternates::CharacterVariant(idents.into()));
Ok(())
},
_ => return Err(i.new_custom_error(StyleParseErrorKind::UnspecifiedError)),
}
})
},
_ => Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError)),
}) {}
if parsed_alternates.is_empty() {
return Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError));
}
Ok(FontVariantAlternates::Value(VariantAlternatesList(
alternates.into(),
)))
}
}
macro_rules! impl_variant_east_asian {
{
$(
$(#[$($meta:tt)+])*
$ident:ident / $css:expr => $gecko:ident = $value:expr,
)+
} => {
bitflags! {
#[derive(MallocSizeOf, ToResolvedValue, ToShmem)]
/// Vairants for east asian variant
pub struct VariantEastAsian: u16 {
/// None of the features
const NORMAL = 0;
$(
$(#[$($meta)+])*
const $ident = $value;
)+
}
}
impl ToCss for VariantEastAsian {
fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
where
W: Write,
{
if self.is_empty() {
return dest.write_str("normal");
}
let mut writer = SequenceWriter::new(dest, " ");
$(
if self.intersects(VariantEastAsian::$ident) {
writer.raw_item($css)?;
}
)+
Ok(())
}
}
/// Asserts that all variant-east-asian matches its NS_FONT_VARIANT_EAST_ASIAN_* value.
#[cfg(feature = "gecko")]
#[inline]
pub fn assert_variant_east_asian_matches() {
use crate::gecko_bindings::structs;
$(
debug_assert_eq!(structs::$gecko as u16, VariantEastAsian::$ident.bits());
)+
}
impl SpecifiedValueInfo for VariantEastAsian {
fn collect_completion_keywords(f: KeywordsCollectFn) {
f(&["normal", $($css,)+]);
}
}
}
}
impl_variant_east_asian! {
/// Enables rendering of JIS78 forms (OpenType feature: jp78)
JIS78 / "jis78" => NS_FONT_VARIANT_EAST_ASIAN_JIS78 = 0x01,
/// Enables rendering of JIS83 forms (OpenType feature: jp83).
JIS83 / "jis83" => NS_FONT_VARIANT_EAST_ASIAN_JIS83 = 0x02,
/// Enables rendering of JIS90 forms (OpenType feature: jp90).
JIS90 / "jis90" => NS_FONT_VARIANT_EAST_ASIAN_JIS90 = 0x04,
/// Enables rendering of JIS2004 forms (OpenType feature: jp04).
JIS04 / "jis04" => NS_FONT_VARIANT_EAST_ASIAN_JIS04 = 0x08,
/// Enables rendering of simplified forms (OpenType feature: smpl).
SIMPLIFIED / "simplified" => NS_FONT_VARIANT_EAST_ASIAN_SIMPLIFIED = 0x10,
/// Enables rendering of traditional forms (OpenType feature: trad).
TRADITIONAL / "traditional" => NS_FONT_VARIANT_EAST_ASIAN_TRADITIONAL = 0x20,
/// Enables rendering of full-width variants (OpenType feature: fwid).
FULL_WIDTH / "full-width" => NS_FONT_VARIANT_EAST_ASIAN_FULL_WIDTH = 0x40,
/// Enables rendering of proportionally-spaced variants (OpenType feature: pwid).
PROPORTIONAL_WIDTH / "proportional-width" => NS_FONT_VARIANT_EAST_ASIAN_PROP_WIDTH = 0x80,
/// Enables display of ruby variant glyphs (OpenType feature: ruby).
RUBY / "ruby" => NS_FONT_VARIANT_EAST_ASIAN_RUBY = 0x100,
}
#[cfg(feature = "gecko")]
impl VariantEastAsian {
/// Obtain a specified value from a Gecko keyword value
///
/// Intended for use with presentation attributes, not style structs
pub fn from_gecko_keyword(kw: u16) -> Self {
Self::from_bits_truncate(kw)
}
/// Transform into gecko keyword
pub fn to_gecko_keyword(self) -> u16 {
self.bits()
}
}
#[cfg(feature = "gecko")]
impl_gecko_keyword_conversions!(VariantEastAsian, u16);
#[cfg_attr(feature = "gecko", derive(MallocSizeOf))]
#[derive(Clone, Copy, Debug, PartialEq, SpecifiedValueInfo, ToCss, ToShmem)]
/// Allows control of glyph substitution and sizing in East Asian text.
pub enum FontVariantEastAsian {
/// Value variant with `variant-east-asian`
Value(VariantEastAsian),
/// System font variant
#[css(skip)]
System(SystemFont),
}
impl FontVariantEastAsian {
#[inline]
/// Get default `font-variant-east-asian` with `empty` variant
pub fn empty() -> Self {
FontVariantEastAsian::Value(VariantEastAsian::empty())
}
system_font_methods!(FontVariantEastAsian, font_variant_east_asian);
}
impl ToComputedValue for FontVariantEastAsian {
type ComputedValue = computed::FontVariantEastAsian;
fn to_computed_value(&self, context: &Context) -> computed::FontVariantEastAsian {
match *self {
FontVariantEastAsian::Value(ref v) => v.clone(),
FontVariantEastAsian::System(_) => self.compute_system(context),
}
}
fn from_computed_value(other: &computed::FontVariantEastAsian) -> Self {
FontVariantEastAsian::Value(other.clone())
}
}
impl Parse for FontVariantEastAsian {
/// normal | [ <east-asian-variant-values> || <east-asian-width-values> || ruby ]
/// <east-asian-variant-values> = [ jis78 | jis83 | jis90 | jis04 | simplified | traditional ]
/// <east-asian-width-values> = [ full-width | proportional-width ]
fn parse<'i, 't>(
_context: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<FontVariantEastAsian, ParseError<'i>> {
let mut result = VariantEastAsian::empty();
if input
.try_parse(|input| input.expect_ident_matching("normal"))
.is_ok()
{
return Ok(FontVariantEastAsian::Value(result));
}
while let Ok(flag) = input.try_parse(|input| {
Ok(
match_ignore_ascii_case! { &input.expect_ident().map_err(|_| ())?,
"jis78" =>
exclusive_value!((result, VariantEastAsian::JIS78 | VariantEastAsian::JIS83 |
VariantEastAsian::JIS90 | VariantEastAsian::JIS04 |
VariantEastAsian::SIMPLIFIED | VariantEastAsian::TRADITIONAL
) => VariantEastAsian::JIS78),
"jis83" =>
exclusive_value!((result, VariantEastAsian::JIS78 | VariantEastAsian::JIS83 |
VariantEastAsian::JIS90 | VariantEastAsian::JIS04 |
VariantEastAsian::SIMPLIFIED | VariantEastAsian::TRADITIONAL
) => VariantEastAsian::JIS83),
"jis90" =>
exclusive_value!((result, VariantEastAsian::JIS78 | VariantEastAsian::JIS83 |
VariantEastAsian::JIS90 | VariantEastAsian::JIS04 |
VariantEastAsian::SIMPLIFIED | VariantEastAsian::TRADITIONAL
) => VariantEastAsian::JIS90),
"jis04" =>
exclusive_value!((result, VariantEastAsian::JIS78 | VariantEastAsian::JIS83 |
VariantEastAsian::JIS90 | VariantEastAsian::JIS04 |
VariantEastAsian::SIMPLIFIED | VariantEastAsian::TRADITIONAL
) => VariantEastAsian::JIS04),
"simplified" =>
exclusive_value!((result, VariantEastAsian::JIS78 | VariantEastAsian::JIS83 |
VariantEastAsian::JIS90 | VariantEastAsian::JIS04 |
VariantEastAsian::SIMPLIFIED | VariantEastAsian::TRADITIONAL
) => VariantEastAsian::SIMPLIFIED),
"traditional" =>
exclusive_value!((result, VariantEastAsian::JIS78 | VariantEastAsian::JIS83 |
VariantEastAsian::JIS90 | VariantEastAsian::JIS04 |
VariantEastAsian::SIMPLIFIED | VariantEastAsian::TRADITIONAL
) => VariantEastAsian::TRADITIONAL),
"full-width" =>
exclusive_value!((result, VariantEastAsian::FULL_WIDTH |
VariantEastAsian::PROPORTIONAL_WIDTH
) => VariantEastAsian::FULL_WIDTH),
"proportional-width" =>
exclusive_value!((result, VariantEastAsian::FULL_WIDTH |
VariantEastAsian::PROPORTIONAL_WIDTH
) => VariantEastAsian::PROPORTIONAL_WIDTH),
"ruby" =>
exclusive_value!((result, VariantEastAsian::RUBY) => VariantEastAsian::RUBY),
_ => return Err(()),
},
)
}) {
result.insert(flag);
}
if !result.is_empty() {
Ok(FontVariantEastAsian::Value(result))
} else {
Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError))
}
}
}
macro_rules! impl_variant_ligatures {
{
$(
$(#[$($meta:tt)+])*
$ident:ident / $css:expr => $gecko:ident = $value:expr,
)+
} => {
bitflags! {
#[derive(MallocSizeOf, ToResolvedValue, ToShmem)]
/// Variants of ligatures
pub struct VariantLigatures: u16 {
/// Specifies that common default features are enabled
const NORMAL = 0;
$(
$(#[$($meta)+])*
const $ident = $value;
)+
}
}
impl ToCss for VariantLigatures {
fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
where
W: Write,
{
if self.is_empty() {
return dest.write_str("normal");
}
if self.contains(VariantLigatures::NONE) {
return dest.write_str("none");
}
let mut writer = SequenceWriter::new(dest, " ");
$(
if self.intersects(VariantLigatures::$ident) {
writer.raw_item($css)?;
}
)+
Ok(())
}
}
/// Asserts that all variant-east-asian matches its NS_FONT_VARIANT_EAST_ASIAN_* value.
#[cfg(feature = "gecko")]
#[inline]
pub fn assert_variant_ligatures_matches() {
use crate::gecko_bindings::structs;
$(
debug_assert_eq!(structs::$gecko as u16, VariantLigatures::$ident.bits());
)+
}
impl SpecifiedValueInfo for VariantLigatures {
fn collect_completion_keywords(f: KeywordsCollectFn) {
f(&["normal", $($css,)+]);
}
}
}
}
impl_variant_ligatures! {
/// Specifies that all types of ligatures and contextual forms
/// covered by this property are explicitly disabled
NONE / "none" => NS_FONT_VARIANT_LIGATURES_NONE = 0x01,
/// Enables display of common ligatures
COMMON_LIGATURES / "common-ligatures" => NS_FONT_VARIANT_LIGATURES_COMMON = 0x02,
/// Disables display of common ligatures
NO_COMMON_LIGATURES / "no-common-ligatures" => NS_FONT_VARIANT_LIGATURES_NO_COMMON = 0x04,
/// Enables display of discretionary ligatures
DISCRETIONARY_LIGATURES / "discretionary-ligatures" => NS_FONT_VARIANT_LIGATURES_DISCRETIONARY = 0x08,
/// Disables display of discretionary ligatures
NO_DISCRETIONARY_LIGATURES / "no-discretionary-ligatures" => NS_FONT_VARIANT_LIGATURES_NO_DISCRETIONARY = 0x10,
/// Enables display of historical ligatures
HISTORICAL_LIGATURES / "historical-ligatures" => NS_FONT_VARIANT_LIGATURES_HISTORICAL = 0x20,
/// Disables display of historical ligatures
NO_HISTORICAL_LIGATURES / "no-historical-ligatures" => NS_FONT_VARIANT_LIGATURES_NO_HISTORICAL = 0x40,
/// Enables display of contextual alternates
CONTEXTUAL / "contextual" => NS_FONT_VARIANT_LIGATURES_CONTEXTUAL = 0x80,
/// Disables display of contextual alternates
NO_CONTEXTUAL / "no-contextual" => NS_FONT_VARIANT_LIGATURES_NO_CONTEXTUAL = 0x100,
}
#[cfg(feature = "gecko")]
impl VariantLigatures {
/// Obtain a specified value from a Gecko keyword value
///
/// Intended for use with presentation attributes, not style structs
pub fn from_gecko_keyword(kw: u16) -> Self {
Self::from_bits_truncate(kw)
}
/// Transform into gecko keyword
pub fn to_gecko_keyword(self) -> u16 {
self.bits()
}
}
#[cfg(feature = "gecko")]
impl_gecko_keyword_conversions!(VariantLigatures, u16);
#[cfg_attr(feature = "gecko", derive(MallocSizeOf))]
#[derive(Clone, Copy, Debug, PartialEq, SpecifiedValueInfo, ToCss, ToShmem)]
/// Ligatures and contextual forms are ways of combining glyphs
/// to produce more harmonized forms
pub enum FontVariantLigatures {
/// Value variant with `variant-ligatures`
Value(VariantLigatures),
/// System font variant
#[css(skip)]
System(SystemFont),
}
impl FontVariantLigatures {
system_font_methods!(FontVariantLigatures, font_variant_ligatures);
/// Default value of `font-variant-ligatures` as `empty`
#[inline]
pub fn empty() -> FontVariantLigatures {
FontVariantLigatures::Value(VariantLigatures::empty())
}
#[inline]
/// Get `none` variant of `font-variant-ligatures`
pub fn none() -> FontVariantLigatures {
FontVariantLigatures::Value(VariantLigatures::NONE)
}
}
impl ToComputedValue for FontVariantLigatures {
type ComputedValue = computed::FontVariantLigatures;
fn to_computed_value(&self, context: &Context) -> computed::FontVariantLigatures {
match *self {
FontVariantLigatures::Value(ref v) => v.clone(),
FontVariantLigatures::System(_) => self.compute_system(context),
}
}
fn from_computed_value(other: &computed::FontVariantLigatures) -> Self {
FontVariantLigatures::Value(other.clone())
}
}
impl Parse for FontVariantLigatures {
/// normal | none |
/// [ <common-lig-values> ||
/// <discretionary-lig-values> ||
/// <historical-lig-values> ||
/// <contextual-alt-values> ]
/// <common-lig-values> = [ common-ligatures | no-common-ligatures ]
/// <discretionary-lig-values> = [ discretionary-ligatures | no-discretionary-ligatures ]
/// <historical-lig-values> = [ historical-ligatures | no-historical-ligatures ]
/// <contextual-alt-values> = [ contextual | no-contextual ]
fn parse<'i, 't>(
_context: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<FontVariantLigatures, ParseError<'i>> {
let mut result = VariantLigatures::empty();
if input
.try_parse(|input| input.expect_ident_matching("normal"))
.is_ok()
{
return Ok(FontVariantLigatures::Value(result));
}
if input
.try_parse(|input| input.expect_ident_matching("none"))
.is_ok()
{
return Ok(FontVariantLigatures::Value(VariantLigatures::NONE));
}
while let Ok(flag) = input.try_parse(|input| {
Ok(
match_ignore_ascii_case! { &input.expect_ident().map_err(|_| ())?,
"common-ligatures" =>
exclusive_value!((result, VariantLigatures::COMMON_LIGATURES |
VariantLigatures::NO_COMMON_LIGATURES
) => VariantLigatures::COMMON_LIGATURES),
"no-common-ligatures" =>
exclusive_value!((result, VariantLigatures::COMMON_LIGATURES |
VariantLigatures::NO_COMMON_LIGATURES
) => VariantLigatures::NO_COMMON_LIGATURES),
"discretionary-ligatures" =>
exclusive_value!((result, VariantLigatures::DISCRETIONARY_LIGATURES |
VariantLigatures::NO_DISCRETIONARY_LIGATURES
) => VariantLigatures::DISCRETIONARY_LIGATURES),
"no-discretionary-ligatures" =>
exclusive_value!((result, VariantLigatures::DISCRETIONARY_LIGATURES |
VariantLigatures::NO_DISCRETIONARY_LIGATURES
) => VariantLigatures::NO_DISCRETIONARY_LIGATURES),
"historical-ligatures" =>
exclusive_value!((result, VariantLigatures::HISTORICAL_LIGATURES |
VariantLigatures::NO_HISTORICAL_LIGATURES
) => VariantLigatures::HISTORICAL_LIGATURES),
"no-historical-ligatures" =>
exclusive_value!((result, VariantLigatures::HISTORICAL_LIGATURES |
VariantLigatures::NO_HISTORICAL_LIGATURES
) => VariantLigatures::NO_HISTORICAL_LIGATURES),
"contextual" =>
exclusive_value!((result, VariantLigatures::CONTEXTUAL |
VariantLigatures::NO_CONTEXTUAL
) => VariantLigatures::CONTEXTUAL),
"no-contextual" =>
exclusive_value!((result, VariantLigatures::CONTEXTUAL |
VariantLigatures::NO_CONTEXTUAL
) => VariantLigatures::NO_CONTEXTUAL),
_ => return Err(()),
},
)
}) {
result.insert(flag);
}
if !result.is_empty() {
Ok(FontVariantLigatures::Value(result))
} else {
Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError))
}
}
}
macro_rules! impl_variant_numeric {
{
$(
$(#[$($meta:tt)+])*
$ident:ident / $css:expr => $gecko:ident = $value:expr,
)+
} => {
bitflags! {
#[derive(MallocSizeOf, ToResolvedValue, ToShmem)]
/// Vairants of numeric values
pub struct VariantNumeric: u8 {
/// None of other variants are enabled.
const NORMAL = 0;
$(
$(#[$($meta)+])*
const $ident = $value;
)+
}
}
impl ToCss for VariantNumeric {
fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
where
W: Write,
{
if self.is_empty() {
return dest.write_str("normal");
}
let mut writer = SequenceWriter::new(dest, " ");
$(
if self.intersects(VariantNumeric::$ident) {
writer.raw_item($css)?;
}
)+
Ok(())
}
}
/// Asserts that all variant-east-asian matches its NS_FONT_VARIANT_EAST_ASIAN_* value.
#[cfg(feature = "gecko")]
#[inline]
pub fn assert_variant_numeric_matches() {
use crate::gecko_bindings::structs;
$(
debug_assert_eq!(structs::$gecko as u8, VariantNumeric::$ident.bits());
)+
}
impl SpecifiedValueInfo for VariantNumeric {
fn collect_completion_keywords(f: KeywordsCollectFn) {
f(&["normal", $($css,)+]);
}
}
}
}
impl_variant_numeric! {
/// Enables display of lining numerals.
LINING_NUMS / "lining-nums" => NS_FONT_VARIANT_NUMERIC_LINING = 0x01,
/// Enables display of old-style numerals.
OLDSTYLE_NUMS / "oldstyle-nums" => NS_FONT_VARIANT_NUMERIC_OLDSTYLE = 0x02,
/// Enables display of proportional numerals.
PROPORTIONAL_NUMS / "proportional-nums" => NS_FONT_VARIANT_NUMERIC_PROPORTIONAL = 0x04,
/// Enables display of tabular numerals.
TABULAR_NUMS / "tabular-nums" => NS_FONT_VARIANT_NUMERIC_TABULAR = 0x08,
/// Enables display of lining diagonal fractions.
DIAGONAL_FRACTIONS / "diagonal-fractions" => NS_FONT_VARIANT_NUMERIC_DIAGONAL_FRACTIONS = 0x10,
/// Enables display of lining stacked fractions.
STACKED_FRACTIONS / "stacked-fractions" => NS_FONT_VARIANT_NUMERIC_STACKED_FRACTIONS = 0x20,
/// Enables display of letter forms used with ordinal numbers.
ORDINAL / "ordinal" => NS_FONT_VARIANT_NUMERIC_ORDINAL = 0x80,
/// Enables display of slashed zeros.
SLASHED_ZERO / "slashed-zero" => NS_FONT_VARIANT_NUMERIC_SLASHZERO = 0x40,
}
#[cfg(feature = "gecko")]
impl VariantNumeric {
/// Obtain a specified value from a Gecko keyword value
///
/// Intended for use with presentation attributes, not style structs
pub fn from_gecko_keyword(kw: u8) -> Self {
Self::from_bits_truncate(kw)
}
/// Transform into gecko keyword
pub fn to_gecko_keyword(self) -> u8 {
self.bits()
}
}
#[cfg(feature = "gecko")]
impl_gecko_keyword_conversions!(VariantNumeric, u8);
#[cfg_attr(feature = "gecko", derive(MallocSizeOf))]
#[derive(Clone, Copy, Debug, PartialEq, SpecifiedValueInfo, ToCss, ToShmem)]
/// Specifies control over numerical forms.
pub enum FontVariantNumeric {
/// Value variant with `variant-numeric`
Value(VariantNumeric),
/// System font
#[css(skip)]
System(SystemFont),
}
impl FontVariantNumeric {
#[inline]
/// Default value of `font-variant-numeric` as `empty`
pub fn empty() -> FontVariantNumeric {
FontVariantNumeric::Value(VariantNumeric::empty())
}
system_font_methods!(FontVariantNumeric, font_variant_numeric);
}
impl ToComputedValue for FontVariantNumeric {
type ComputedValue = computed::FontVariantNumeric;
fn to_computed_value(&self, context: &Context) -> computed::FontVariantNumeric {
match *self {
FontVariantNumeric::Value(ref v) => v.clone(),
FontVariantNumeric::System(_) => self.compute_system(context),
}
}
fn from_computed_value(other: &computed::FontVariantNumeric) -> Self {
FontVariantNumeric::Value(other.clone())
}
}
impl Parse for FontVariantNumeric {
/// normal |
/// [ <numeric-figure-values> ||
/// <numeric-spacing-values> ||
/// <numeric-fraction-values> ||
/// ordinal ||
/// slashed-zero ]
/// <numeric-figure-values> = [ lining-nums | oldstyle-nums ]
/// <numeric-spacing-values> = [ proportional-nums | tabular-nums ]
/// <numeric-fraction-values> = [ diagonal-fractions | stacked-fractions ]
fn parse<'i, 't>(
_context: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<FontVariantNumeric, ParseError<'i>> {
let mut result = VariantNumeric::empty();
if input
.try_parse(|input| input.expect_ident_matching("normal"))
.is_ok()
{
return Ok(FontVariantNumeric::Value(result));
}
while let Ok(flag) = input.try_parse(|input| {
Ok(
match_ignore_ascii_case! { &input.expect_ident().map_err(|_| ())?,
"ordinal" =>
exclusive_value!((result, VariantNumeric::ORDINAL) => VariantNumeric::ORDINAL),
"slashed-zero" =>
exclusive_value!((result, VariantNumeric::SLASHED_ZERO) => VariantNumeric::SLASHED_ZERO),
"lining-nums" =>
exclusive_value!((result, VariantNumeric::LINING_NUMS |
VariantNumeric::OLDSTYLE_NUMS
) => VariantNumeric::LINING_NUMS),
"oldstyle-nums" =>
exclusive_value!((result, VariantNumeric::LINING_NUMS |
VariantNumeric::OLDSTYLE_NUMS
) => VariantNumeric::OLDSTYLE_NUMS),
"proportional-nums" =>
exclusive_value!((result, VariantNumeric::PROPORTIONAL_NUMS |
VariantNumeric::TABULAR_NUMS
) => VariantNumeric::PROPORTIONAL_NUMS),
"tabular-nums" =>
exclusive_value!((result, VariantNumeric::PROPORTIONAL_NUMS |
VariantNumeric::TABULAR_NUMS
) => VariantNumeric::TABULAR_NUMS),
"diagonal-fractions" =>
exclusive_value!((result, VariantNumeric::DIAGONAL_FRACTIONS |
VariantNumeric::STACKED_FRACTIONS
) => VariantNumeric::DIAGONAL_FRACTIONS),
"stacked-fractions" =>
exclusive_value!((result, VariantNumeric::DIAGONAL_FRACTIONS |
VariantNumeric::STACKED_FRACTIONS
) => VariantNumeric::STACKED_FRACTIONS),
_ => return Err(()),
},
)
}) {
result.insert(flag);
}
if !result.is_empty() {
Ok(FontVariantNumeric::Value(result))
} else {
Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError))
}
}
}
/// This property provides low-level control over OpenType or TrueType font features.
pub type SpecifiedFontFeatureSettings = FontSettings<FeatureTagValue<Integer>>;
/// Define initial settings that apply when the font defined by an @font-face
/// rule is rendered.
#[derive(Clone, Debug, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToCss, ToShmem)]
pub enum FontFeatureSettings {
/// Value of `FontSettings`
Value(SpecifiedFontFeatureSettings),
/// System font
#[css(skip)]
System(SystemFont),
}
impl FontFeatureSettings {
#[inline]
/// Get default value of `font-feature-settings` as normal
pub fn normal() -> FontFeatureSettings {
FontFeatureSettings::Value(FontSettings::normal())
}
system_font_methods!(FontFeatureSettings, font_feature_settings);
}
impl ToComputedValue for FontFeatureSettings {
type ComputedValue = computed::FontFeatureSettings;
fn to_computed_value(&self, context: &Context) -> computed::FontFeatureSettings {
match *self {
FontFeatureSettings::Value(ref v) => v.to_computed_value(context),
FontFeatureSettings::System(_) => self.compute_system(context),
}
}
fn from_computed_value(other: &computed::FontFeatureSettings) -> Self {
FontFeatureSettings::Value(ToComputedValue::from_computed_value(other))
}
}
impl Parse for FontFeatureSettings {
/// normal | <feature-tag-value>#
fn parse<'i, 't>(
context: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<FontFeatureSettings, ParseError<'i>> {
SpecifiedFontFeatureSettings::parse(context, input).map(FontFeatureSettings::Value)
}
}
#[derive(
Clone,
Copy,
Debug,
MallocSizeOf,
PartialEq,
SpecifiedValueInfo,
ToComputedValue,
ToResolvedValue,
ToShmem,
)]
/// Whether user agents are allowed to synthesize bold or oblique font faces
/// when a font family lacks bold or italic faces
pub struct FontSynthesis {
/// If a `font-weight` is requested that the font family does not contain,
/// the user agent may synthesize the requested weight from the weights
/// that do exist in the font family.
#[css(represents_keyword)]
pub weight: bool,
/// If a font-style is requested that the font family does not contain,
/// the user agent may synthesize the requested style from the normal face in the font family.
#[css(represents_keyword)]
pub style: bool,
}
impl FontSynthesis {
#[inline]
/// Get the default value of font-synthesis
pub fn get_initial_value() -> Self {
FontSynthesis {
weight: true,
style: true,
}
}
}
impl Parse for FontSynthesis {
fn parse<'i, 't>(
_: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<FontSynthesis, ParseError<'i>> {
let mut result = FontSynthesis {
weight: false,
style: false,
};
try_match_ident_ignore_ascii_case! { input,
"none" => Ok(result),
"weight" => {
result.weight = true;
if input.try_parse(|input| input.expect_ident_matching("style")).is_ok() {
result.style = true;
}
Ok(result)
},
"style" => {
result.style = true;
if input.try_parse(|input| input.expect_ident_matching("weight")).is_ok() {
result.weight = true;
}
Ok(result)
},
}
}
}
impl ToCss for FontSynthesis {
fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
where
W: Write,
{
if self.weight && self.style {
dest.write_str("weight style")
} else if self.style {
dest.write_str("style")
} else if self.weight {
dest.write_str("weight")
} else {
dest.write_str("none")
}
}
}
#[cfg(feature = "gecko")]
impl From<u8> for FontSynthesis {
fn from(bits: u8) -> FontSynthesis {
use crate::gecko_bindings::structs;
FontSynthesis {
weight: bits & structs::NS_FONT_SYNTHESIS_WEIGHT as u8 != 0,
style: bits & structs::NS_FONT_SYNTHESIS_STYLE as u8 != 0,
}
}
}
#[cfg(feature = "gecko")]
impl From<FontSynthesis> for u8 {
fn from(v: FontSynthesis) -> u8 {
use crate::gecko_bindings::structs;
let mut bits: u8 = 0;
if v.weight {
bits |= structs::NS_FONT_SYNTHESIS_WEIGHT as u8;
}
if v.style {
bits |= structs::NS_FONT_SYNTHESIS_STYLE as u8;
}
bits
}
}
#[derive(Clone, Debug, Eq, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToCss, ToShmem)]
/// Allows authors to explicitly specify the language system of the font,
/// overriding the language system implied by the content language
pub enum FontLanguageOverride {
/// When rendering with OpenType fonts,
/// the content language of the element is
/// used to infer the OpenType language system
Normal,
/// Single three-letter case-sensitive OpenType language system tag,
/// specifies the OpenType language system to be used instead of
/// the language system implied by the language of the element
Override(Box<str>),
/// Use system font
#[css(skip)]
System(SystemFont),
}
impl FontLanguageOverride {
#[inline]
/// Get default value with `normal`
pub fn normal() -> FontLanguageOverride {
FontLanguageOverride::Normal
}
/// The ToComputedValue implementation for non-system-font
/// FontLanguageOverride, used for @font-face descriptors.
#[inline]
pub fn compute_non_system(&self) -> computed::FontLanguageOverride {
match *self {
FontLanguageOverride::Normal => computed::FontLanguageOverride::zero(),
FontLanguageOverride::Override(ref lang) => {
computed::FontLanguageOverride::from_str(lang)
},
FontLanguageOverride::System(..) => unreachable!(),
}
}
system_font_methods!(FontLanguageOverride, font_language_override);
}
impl ToComputedValue for FontLanguageOverride {
type ComputedValue = computed::FontLanguageOverride;
#[inline]
fn to_computed_value(&self, context: &Context) -> computed::FontLanguageOverride {
match *self {
FontLanguageOverride::System(_) => self.compute_system(context),
_ => self.compute_non_system(),
}
}
#[inline]
fn from_computed_value(computed: &computed::FontLanguageOverride) -> Self {
if *computed == computed::FontLanguageOverride::zero() {
return FontLanguageOverride::Normal;
}
FontLanguageOverride::Override(computed.to_str(&mut [0; 4]).into())
}
}
impl Parse for FontLanguageOverride {
/// normal | <string>
fn parse<'i, 't>(
_: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<FontLanguageOverride, ParseError<'i>> {
if input
.try_parse(|input| input.expect_ident_matching("normal"))
.is_ok()
{
return Ok(FontLanguageOverride::Normal);
}
let string = input.expect_string()?;
Ok(FontLanguageOverride::Override(
string.as_ref().to_owned().into_boxed_str(),
))
}
}
/// This property provides low-level control over OpenType or TrueType font
/// variations.
pub type SpecifiedFontVariationSettings = FontSettings<VariationValue<Number>>;
/// Define initial settings that apply when the font defined by an @font-face
/// rule is rendered.
#[derive(Clone, Debug, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToCss, ToShmem)]
pub enum FontVariationSettings {
/// Value of `FontSettings`
Value(SpecifiedFontVariationSettings),
/// System font
#[css(skip)]
System(SystemFont),
}
impl FontVariationSettings {
#[inline]
/// Get default value of `font-variation-settings` as normal
pub fn normal() -> FontVariationSettings {
FontVariationSettings::Value(FontSettings::normal())
}
system_font_methods!(FontVariationSettings, font_variation_settings);
}
impl ToComputedValue for FontVariationSettings {
type ComputedValue = computed::FontVariationSettings;
fn to_computed_value(&self, context: &Context) -> computed::FontVariationSettings {
match *self {
FontVariationSettings::Value(ref v) => v.to_computed_value(context),
FontVariationSettings::System(_) => self.compute_system(context),
}
}
fn from_computed_value(other: &computed::FontVariationSettings) -> Self {
FontVariationSettings::Value(ToComputedValue::from_computed_value(other))
}
}
impl Parse for FontVariationSettings {
/// normal | <variation-tag-value>#
fn parse<'i, 't>(
context: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<FontVariationSettings, ParseError<'i>> {
SpecifiedFontVariationSettings::parse(context, input).map(FontVariationSettings::Value)
}
}
fn parse_one_feature_value<'i, 't>(
context: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<Integer, ParseError<'i>> {
if let Ok(integer) = input.try_parse(|i| Integer::parse_non_negative(context, i)) {
return Ok(integer);
}
try_match_ident_ignore_ascii_case! { input,
"on" => Ok(Integer::new(1)),
"off" => Ok(Integer::new(0)),
}
}
impl Parse for FeatureTagValue<Integer> {
/// https://drafts.csswg.org/css-fonts-4/#feature-tag-value
fn parse<'i, 't>(
context: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<Self, ParseError<'i>> {
let tag = FontTag::parse(context, input)?;
let value = input
.try_parse(|i| parse_one_feature_value(context, i))
.unwrap_or_else(|_| Integer::new(1));
Ok(Self { tag, value })
}
}
impl Parse for VariationValue<Number> {
/// This is the `<string> <number>` part of the font-variation-settings
/// syntax.
fn parse<'i, 't>(
context: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<Self, ParseError<'i>> {
let tag = FontTag::parse(context, input)?;
let value = Number::parse(context, input)?;
Ok(Self { tag, value })
}
}
#[derive(
Clone,
Copy,
Debug,
MallocSizeOf,
PartialEq,
SpecifiedValueInfo,
ToComputedValue,
ToCss,
ToResolvedValue,
ToShmem,
)]
/// text-zoom. Enable if true, disable if false
pub struct XTextZoom(#[css(skip)] pub bool);
impl Parse for XTextZoom {
fn parse<'i, 't>(
_: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<XTextZoom, ParseError<'i>> {
debug_assert!(
false,
"Should be set directly by presentation attributes only."
);
Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError))
}
}
#[derive(
Clone,
Debug,
MallocSizeOf,
PartialEq,
SpecifiedValueInfo,
ToComputedValue,
ToCss,
ToResolvedValue,
ToShmem,
)]
/// Internal property that reflects the lang attribute
pub struct XLang(#[css(skip)] pub Atom);
impl XLang {
#[inline]
/// Get default value for `-x-lang`
pub fn get_initial_value() -> XLang {
XLang(atom!(""))
}
}
impl Parse for XLang {
fn parse<'i, 't>(
_: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<XLang, ParseError<'i>> {
debug_assert!(
false,
"Should be set directly by presentation attributes only."
);
Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError))
}
}
#[cfg_attr(feature = "gecko", derive(MallocSizeOf))]
#[derive(Clone, Copy, Debug, PartialEq, SpecifiedValueInfo, ToCss, ToShmem)]
/// Specifies the minimum font size allowed due to changes in scriptlevel.
/// Ref: https://wiki.mozilla.org/MathML:mstyle
pub struct MozScriptMinSize(pub NoCalcLength);
impl MozScriptMinSize {
#[inline]
/// Calculate initial value of -moz-script-min-size.
pub fn get_initial_value() -> Length {
Length::new(DEFAULT_SCRIPT_MIN_SIZE_PT as f32 * (AU_PER_PT / AU_PER_PX))
}
}
impl Parse for MozScriptMinSize {
fn parse<'i, 't>(
_: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<MozScriptMinSize, ParseError<'i>> {
debug_assert!(
false,
"Should be set directly by presentation attributes only."
);
Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError))
}
}
#[cfg_attr(feature = "gecko", derive(MallocSizeOf))]
#[derive(Clone, Copy, Debug, PartialEq, SpecifiedValueInfo, ToCss, ToShmem)]
/// Changes the scriptlevel in effect for the children.
/// Ref: https://wiki.mozilla.org/MathML:mstyle
///
/// The main effect of scriptlevel is to control the font size.
/// https://www.w3.org/TR/MathML3/chapter3.html#presm.scriptlevel
pub enum MozScriptLevel {
/// Change `font-size` relatively.
Relative(i32),
/// Change `font-size` absolutely.
///
/// Should only be serialized by presentation attributes, so even though
/// serialization for this would look the same as for the `Relative`
/// variant, it is unexposed, so no big deal.
#[css(function)]
MozAbsolute(i32),
/// Change `font-size` automatically.
Auto,
}
impl Parse for MozScriptLevel {
fn parse<'i, 't>(
_: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<MozScriptLevel, ParseError<'i>> {
// We don't bother to handle calc here.
if let Ok(i) = input.try_parse(|i| i.expect_integer()) {
return Ok(MozScriptLevel::Relative(i));
}
input.expect_ident_matching("auto")?;
Ok(MozScriptLevel::Auto)
}
}
#[cfg_attr(feature = "gecko", derive(MallocSizeOf))]
#[derive(
Clone,
Copy,
Debug,
PartialEq,
SpecifiedValueInfo,
ToComputedValue,
ToCss,
ToResolvedValue,
ToShmem,
)]
/// Specifies the multiplier to be used to adjust font size
/// due to changes in scriptlevel.
///
/// Ref: https://www.w3.org/TR/MathML3/chapter3.html#presm.mstyle.attrs
pub struct MozScriptSizeMultiplier(pub f32);
impl MozScriptSizeMultiplier {
#[inline]
/// Get default value of `-moz-script-size-multiplier`
pub fn get_initial_value() -> MozScriptSizeMultiplier {
MozScriptSizeMultiplier(DEFAULT_SCRIPT_SIZE_MULTIPLIER as f32)
}
}
impl Parse for MozScriptSizeMultiplier {
fn parse<'i, 't>(
_: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<MozScriptSizeMultiplier, ParseError<'i>> {
debug_assert!(
false,
"Should be set directly by presentation attributes only."
);
Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError))
}
}
impl From<f32> for MozScriptSizeMultiplier {
fn from(v: f32) -> Self {
MozScriptSizeMultiplier(v)
}
}
impl From<MozScriptSizeMultiplier> for f32 {
fn from(v: MozScriptSizeMultiplier) -> f32 {
v.0
}
}
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