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a0617bff0d
This patch is generated by running `cargo +nightly fmt` under `servo/components/style/` and `servo/ports/geckolib` against mozilla-central https://hg.mozilla.org/mozilla-central/rev/b193f2e7a6a5d1f042c957ea4acd5c89bf210512 My nightly version is: 1.58.0-nightly (c9c4b5d72 2021-11-17) Manually remove the redundant braces in author_styles.rs to fix a warning. Differential Revision: https://phabricator.services.mozilla.com/D131556
676 lines
22 KiB
Rust
676 lines
22 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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//! The [`@counter-style`][counter-style] at-rule.
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//!
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//! [counter-style]: https://drafts.csswg.org/css-counter-styles/
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use crate::error_reporting::ContextualParseError;
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use crate::parser::{Parse, ParserContext};
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use crate::shared_lock::{SharedRwLockReadGuard, ToCssWithGuard};
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use crate::str::CssStringWriter;
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use crate::values::specified::Integer;
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use crate::values::CustomIdent;
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use crate::Atom;
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use cssparser::{AtRuleParser, DeclarationListParser, DeclarationParser};
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use cssparser::{CowRcStr, Parser, SourceLocation, Token};
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use selectors::parser::SelectorParseErrorKind;
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use std::fmt::{self, Write};
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use std::mem;
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use std::num::Wrapping;
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use style_traits::{Comma, CssWriter, OneOrMoreSeparated, ParseError};
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use style_traits::{StyleParseErrorKind, ToCss};
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/// Parse a counter style name reference.
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///
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/// This allows the reserved counter style names "decimal" and "disc".
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pub fn parse_counter_style_name<'i, 't>(
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input: &mut Parser<'i, 't>,
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) -> Result<CustomIdent, ParseError<'i>> {
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macro_rules! predefined {
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($($name: expr,)+) => {
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{
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ascii_case_insensitive_phf_map! {
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// FIXME: use static atoms https://github.com/rust-lang/rust/issues/33156
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predefined -> &'static str = {
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$(
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$name => $name,
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)+
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}
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}
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let location = input.current_source_location();
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let ident = input.expect_ident()?;
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if let Some(&lower_cased) = predefined(&ident) {
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Ok(CustomIdent(Atom::from(lower_cased)))
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} else {
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// none is always an invalid <counter-style> value.
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CustomIdent::from_ident(location, ident, &["none"])
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}
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}
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}
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}
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include!("predefined.rs")
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}
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fn is_valid_name_definition(ident: &CustomIdent) -> bool {
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ident.0 != atom!("decimal") &&
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ident.0 != atom!("disc") &&
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ident.0 != atom!("circle") &&
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ident.0 != atom!("square") &&
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ident.0 != atom!("disclosure-closed") &&
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ident.0 != atom!("disclosure-open")
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}
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/// Parse the prelude of an @counter-style rule
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pub fn parse_counter_style_name_definition<'i, 't>(
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input: &mut Parser<'i, 't>,
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) -> Result<CustomIdent, ParseError<'i>> {
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parse_counter_style_name(input).and_then(|ident| {
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if !is_valid_name_definition(&ident) {
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Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError))
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} else {
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Ok(ident)
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}
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})
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}
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/// Parse the body (inside `{}`) of an @counter-style rule
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pub fn parse_counter_style_body<'i, 't>(
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name: CustomIdent,
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context: &ParserContext,
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input: &mut Parser<'i, 't>,
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location: SourceLocation,
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) -> Result<CounterStyleRuleData, ParseError<'i>> {
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let start = input.current_source_location();
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let mut rule = CounterStyleRuleData::empty(name, location);
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{
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let parser = CounterStyleRuleParser {
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context: context,
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rule: &mut rule,
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};
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let mut iter = DeclarationListParser::new(input, parser);
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while let Some(declaration) = iter.next() {
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if let Err((error, slice)) = declaration {
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let location = error.location;
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let error = ContextualParseError::UnsupportedCounterStyleDescriptorDeclaration(
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slice, error,
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);
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context.log_css_error(location, error)
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}
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}
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}
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let error = match *rule.resolved_system() {
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ref system @ System::Cyclic |
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ref system @ System::Fixed { .. } |
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ref system @ System::Symbolic |
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ref system @ System::Alphabetic |
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ref system @ System::Numeric
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if rule.symbols.is_none() =>
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{
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let system = system.to_css_string();
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Some(ContextualParseError::InvalidCounterStyleWithoutSymbols(
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system,
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))
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},
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ref system @ System::Alphabetic | ref system @ System::Numeric
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if rule.symbols().unwrap().0.len() < 2 =>
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{
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let system = system.to_css_string();
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Some(ContextualParseError::InvalidCounterStyleNotEnoughSymbols(
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system,
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))
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},
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System::Additive if rule.additive_symbols.is_none() => {
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Some(ContextualParseError::InvalidCounterStyleWithoutAdditiveSymbols)
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},
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System::Extends(_) if rule.symbols.is_some() => {
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Some(ContextualParseError::InvalidCounterStyleExtendsWithSymbols)
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},
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System::Extends(_) if rule.additive_symbols.is_some() => {
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Some(ContextualParseError::InvalidCounterStyleExtendsWithAdditiveSymbols)
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},
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_ => None,
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};
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if let Some(error) = error {
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context.log_css_error(start, error);
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Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError))
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} else {
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Ok(rule)
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}
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}
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struct CounterStyleRuleParser<'a, 'b: 'a> {
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context: &'a ParserContext<'b>,
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rule: &'a mut CounterStyleRuleData,
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}
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/// Default methods reject all at rules.
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impl<'a, 'b, 'i> AtRuleParser<'i> for CounterStyleRuleParser<'a, 'b> {
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type Prelude = ();
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type AtRule = ();
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type Error = StyleParseErrorKind<'i>;
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}
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macro_rules! checker {
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($self:ident._($value:ident)) => {};
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($self:ident. $checker:ident($value:ident)) => {
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if !$self.$checker(&$value) {
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return false;
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}
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};
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}
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macro_rules! counter_style_descriptors {
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(
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$( #[$doc: meta] $name: tt $ident: ident / $setter: ident [$checker: tt]: $ty: ty, )+
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) => {
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/// An @counter-style rule
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#[derive(Clone, Debug, ToShmem)]
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pub struct CounterStyleRuleData {
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name: CustomIdent,
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generation: Wrapping<u32>,
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$(
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#[$doc]
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$ident: Option<$ty>,
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)+
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/// Line and column of the @counter-style rule source code.
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pub source_location: SourceLocation,
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}
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impl CounterStyleRuleData {
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fn empty(name: CustomIdent, source_location: SourceLocation) -> Self {
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CounterStyleRuleData {
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name: name,
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generation: Wrapping(0),
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$(
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$ident: None,
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)+
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source_location,
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}
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}
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$(
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#[$doc]
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pub fn $ident(&self) -> Option<&$ty> {
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self.$ident.as_ref()
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}
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)+
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$(
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#[$doc]
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pub fn $setter(&mut self, value: $ty) -> bool {
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checker!(self.$checker(value));
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self.$ident = Some(value);
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self.generation += Wrapping(1);
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true
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}
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)+
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}
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impl<'a, 'b, 'i> DeclarationParser<'i> for CounterStyleRuleParser<'a, 'b> {
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type Declaration = ();
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type Error = StyleParseErrorKind<'i>;
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fn parse_value<'t>(&mut self, name: CowRcStr<'i>, input: &mut Parser<'i, 't>)
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-> Result<(), ParseError<'i>> {
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match_ignore_ascii_case! { &*name,
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$(
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$name => {
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// DeclarationParser also calls parse_entirely
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// so we’d normally not need to,
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// but in this case we do because we set the value as a side effect
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// rather than returning it.
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let value = input.parse_entirely(|i| Parse::parse(self.context, i))?;
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self.rule.$ident = Some(value)
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},
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)*
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_ => return Err(input.new_custom_error(SelectorParseErrorKind::UnexpectedIdent(name.clone()))),
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}
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Ok(())
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}
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}
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impl ToCssWithGuard for CounterStyleRuleData {
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fn to_css(&self, _guard: &SharedRwLockReadGuard, dest: &mut CssStringWriter) -> fmt::Result {
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dest.write_str("@counter-style ")?;
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self.name.to_css(&mut CssWriter::new(dest))?;
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dest.write_str(" { ")?;
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$(
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if let Some(ref value) = self.$ident {
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dest.write_str(concat!($name, ": "))?;
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ToCss::to_css(value, &mut CssWriter::new(dest))?;
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dest.write_str("; ")?;
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}
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)+
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dest.write_str("}")
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}
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}
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}
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}
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counter_style_descriptors! {
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/// <https://drafts.csswg.org/css-counter-styles/#counter-style-system>
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"system" system / set_system [check_system]: System,
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/// <https://drafts.csswg.org/css-counter-styles/#counter-style-negative>
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"negative" negative / set_negative [_]: Negative,
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/// <https://drafts.csswg.org/css-counter-styles/#counter-style-prefix>
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"prefix" prefix / set_prefix [_]: Symbol,
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/// <https://drafts.csswg.org/css-counter-styles/#counter-style-suffix>
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"suffix" suffix / set_suffix [_]: Symbol,
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/// <https://drafts.csswg.org/css-counter-styles/#counter-style-range>
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"range" range / set_range [_]: CounterRanges,
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/// <https://drafts.csswg.org/css-counter-styles/#counter-style-pad>
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"pad" pad / set_pad [_]: Pad,
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/// <https://drafts.csswg.org/css-counter-styles/#counter-style-fallback>
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"fallback" fallback / set_fallback [_]: Fallback,
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/// <https://drafts.csswg.org/css-counter-styles/#descdef-counter-style-symbols>
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"symbols" symbols / set_symbols [check_symbols]: Symbols,
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/// <https://drafts.csswg.org/css-counter-styles/#descdef-counter-style-additive-symbols>
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"additive-symbols" additive_symbols /
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set_additive_symbols [check_additive_symbols]: AdditiveSymbols,
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/// <https://drafts.csswg.org/css-counter-styles/#counter-style-speak-as>
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"speak-as" speak_as / set_speak_as [_]: SpeakAs,
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}
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// Implements the special checkers for some setters.
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// See <https://drafts.csswg.org/css-counter-styles/#the-csscounterstylerule-interface>
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impl CounterStyleRuleData {
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/// Check that the system is effectively not changed. Only params
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/// of system descriptor is changeable.
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fn check_system(&self, value: &System) -> bool {
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mem::discriminant(self.resolved_system()) == mem::discriminant(value)
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}
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fn check_symbols(&self, value: &Symbols) -> bool {
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match *self.resolved_system() {
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// These two systems require at least two symbols.
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System::Numeric | System::Alphabetic => value.0.len() >= 2,
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// No symbols should be set for extends system.
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System::Extends(_) => false,
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_ => true,
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}
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}
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fn check_additive_symbols(&self, _value: &AdditiveSymbols) -> bool {
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match *self.resolved_system() {
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// No additive symbols should be set for extends system.
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System::Extends(_) => false,
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_ => true,
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}
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}
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}
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impl CounterStyleRuleData {
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/// Get the name of the counter style rule.
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pub fn name(&self) -> &CustomIdent {
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&self.name
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}
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/// Set the name of the counter style rule. Caller must ensure that
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/// the name is valid.
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pub fn set_name(&mut self, name: CustomIdent) {
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debug_assert!(is_valid_name_definition(&name));
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self.name = name;
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}
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/// Get the current generation of the counter style rule.
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pub fn generation(&self) -> u32 {
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self.generation.0
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}
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/// Get the system of this counter style rule, default to
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/// `symbolic` if not specified.
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pub fn resolved_system(&self) -> &System {
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match self.system {
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Some(ref system) => system,
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None => &System::Symbolic,
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}
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}
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}
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/// <https://drafts.csswg.org/css-counter-styles/#counter-style-system>
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#[derive(Clone, Debug, ToShmem)]
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pub enum System {
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/// 'cyclic'
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Cyclic,
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/// 'numeric'
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Numeric,
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/// 'alphabetic'
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Alphabetic,
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/// 'symbolic'
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Symbolic,
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/// 'additive'
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Additive,
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/// 'fixed <integer>?'
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Fixed {
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/// '<integer>?'
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first_symbol_value: Option<Integer>,
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},
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/// 'extends <counter-style-name>'
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Extends(CustomIdent),
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}
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impl Parse for System {
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fn parse<'i, 't>(
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context: &ParserContext,
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input: &mut Parser<'i, 't>,
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) -> Result<Self, ParseError<'i>> {
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try_match_ident_ignore_ascii_case! { input,
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"cyclic" => Ok(System::Cyclic),
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"numeric" => Ok(System::Numeric),
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"alphabetic" => Ok(System::Alphabetic),
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"symbolic" => Ok(System::Symbolic),
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"additive" => Ok(System::Additive),
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"fixed" => {
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let first_symbol_value = input.try_parse(|i| Integer::parse(context, i)).ok();
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Ok(System::Fixed { first_symbol_value })
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},
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"extends" => {
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let other = parse_counter_style_name(input)?;
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Ok(System::Extends(other))
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},
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}
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}
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}
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impl ToCss for System {
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fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
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where
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W: Write,
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{
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match *self {
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System::Cyclic => dest.write_str("cyclic"),
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System::Numeric => dest.write_str("numeric"),
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System::Alphabetic => dest.write_str("alphabetic"),
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System::Symbolic => dest.write_str("symbolic"),
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System::Additive => dest.write_str("additive"),
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System::Fixed { first_symbol_value } => {
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if let Some(value) = first_symbol_value {
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dest.write_str("fixed ")?;
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value.to_css(dest)
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} else {
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dest.write_str("fixed")
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}
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},
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System::Extends(ref other) => {
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dest.write_str("extends ")?;
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other.to_css(dest)
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},
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}
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}
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}
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/// <https://drafts.csswg.org/css-counter-styles/#typedef-symbol>
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#[derive(
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Clone, Debug, Eq, MallocSizeOf, PartialEq, ToComputedValue, ToResolvedValue, ToCss, ToShmem,
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)]
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#[repr(u8)]
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pub enum Symbol {
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/// <string>
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String(crate::OwnedStr),
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/// <custom-ident>
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Ident(CustomIdent),
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// Not implemented:
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// /// <image>
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// Image(Image),
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}
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impl Parse for Symbol {
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fn parse<'i, 't>(
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_context: &ParserContext,
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input: &mut Parser<'i, 't>,
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) -> Result<Self, ParseError<'i>> {
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let location = input.current_source_location();
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match *input.next()? {
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Token::QuotedString(ref s) => Ok(Symbol::String(s.as_ref().to_owned().into())),
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Token::Ident(ref s) => Ok(Symbol::Ident(CustomIdent::from_ident(location, s, &[])?)),
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ref t => Err(location.new_unexpected_token_error(t.clone())),
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}
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}
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}
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impl Symbol {
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/// Returns whether this symbol is allowed in symbols() function.
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pub fn is_allowed_in_symbols(&self) -> bool {
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match self {
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// Identifier is not allowed.
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&Symbol::Ident(_) => false,
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_ => true,
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}
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}
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}
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/// <https://drafts.csswg.org/css-counter-styles/#counter-style-negative>
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#[derive(Clone, Debug, ToCss, ToShmem)]
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pub struct Negative(pub Symbol, pub Option<Symbol>);
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impl Parse for Negative {
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fn parse<'i, 't>(
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context: &ParserContext,
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input: &mut Parser<'i, 't>,
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) -> Result<Self, ParseError<'i>> {
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Ok(Negative(
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Symbol::parse(context, input)?,
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input.try_parse(|input| Symbol::parse(context, input)).ok(),
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))
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}
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}
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/// <https://drafts.csswg.org/css-counter-styles/#counter-style-range>
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#[derive(Clone, Debug, ToCss, ToShmem)]
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pub struct CounterRange {
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/// The start of the range.
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pub start: CounterBound,
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/// The end of the range.
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pub end: CounterBound,
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}
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/// <https://drafts.csswg.org/css-counter-styles/#counter-style-range>
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///
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/// Empty represents 'auto'
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#[derive(Clone, Debug, ToCss, ToShmem)]
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#[css(comma)]
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pub struct CounterRanges(#[css(iterable, if_empty = "auto")] pub crate::OwnedSlice<CounterRange>);
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/// A bound found in `CounterRanges`.
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#[derive(Clone, Copy, Debug, ToCss, ToShmem)]
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pub enum CounterBound {
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/// An integer bound.
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Integer(Integer),
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/// The infinite bound.
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Infinite,
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}
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impl Parse for CounterRanges {
|
||
fn parse<'i, 't>(
|
||
context: &ParserContext,
|
||
input: &mut Parser<'i, 't>,
|
||
) -> Result<Self, ParseError<'i>> {
|
||
if input
|
||
.try_parse(|input| input.expect_ident_matching("auto"))
|
||
.is_ok()
|
||
{
|
||
return Ok(CounterRanges(Default::default()));
|
||
}
|
||
|
||
let ranges = input.parse_comma_separated(|input| {
|
||
let start = parse_bound(context, input)?;
|
||
let end = parse_bound(context, input)?;
|
||
if let (CounterBound::Integer(start), CounterBound::Integer(end)) = (start, end) {
|
||
if start > end {
|
||
return Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError));
|
||
}
|
||
}
|
||
Ok(CounterRange { start, end })
|
||
})?;
|
||
|
||
Ok(CounterRanges(ranges.into()))
|
||
}
|
||
}
|
||
|
||
fn parse_bound<'i, 't>(
|
||
context: &ParserContext,
|
||
input: &mut Parser<'i, 't>,
|
||
) -> Result<CounterBound, ParseError<'i>> {
|
||
if let Ok(integer) = input.try_parse(|input| Integer::parse(context, input)) {
|
||
return Ok(CounterBound::Integer(integer));
|
||
}
|
||
input.expect_ident_matching("infinite")?;
|
||
Ok(CounterBound::Infinite)
|
||
}
|
||
|
||
/// <https://drafts.csswg.org/css-counter-styles/#counter-style-pad>
|
||
#[derive(Clone, Debug, ToCss, ToShmem)]
|
||
pub struct Pad(pub Integer, pub Symbol);
|
||
|
||
impl Parse for Pad {
|
||
fn parse<'i, 't>(
|
||
context: &ParserContext,
|
||
input: &mut Parser<'i, 't>,
|
||
) -> Result<Self, ParseError<'i>> {
|
||
let pad_with = input.try_parse(|input| Symbol::parse(context, input));
|
||
let min_length = Integer::parse_non_negative(context, input)?;
|
||
let pad_with = pad_with.or_else(|_| Symbol::parse(context, input))?;
|
||
Ok(Pad(min_length, pad_with))
|
||
}
|
||
}
|
||
|
||
/// <https://drafts.csswg.org/css-counter-styles/#counter-style-fallback>
|
||
#[derive(Clone, Debug, ToCss, ToShmem)]
|
||
pub struct Fallback(pub CustomIdent);
|
||
|
||
impl Parse for Fallback {
|
||
fn parse<'i, 't>(
|
||
_context: &ParserContext,
|
||
input: &mut Parser<'i, 't>,
|
||
) -> Result<Self, ParseError<'i>> {
|
||
Ok(Fallback(parse_counter_style_name(input)?))
|
||
}
|
||
}
|
||
|
||
/// <https://drafts.csswg.org/css-counter-styles/#descdef-counter-style-symbols>
|
||
#[derive(
|
||
Clone, Debug, Eq, MallocSizeOf, PartialEq, ToComputedValue, ToResolvedValue, ToCss, ToShmem,
|
||
)]
|
||
#[repr(C)]
|
||
pub struct Symbols(#[css(iterable)] pub crate::OwnedSlice<Symbol>);
|
||
|
||
impl Parse for Symbols {
|
||
fn parse<'i, 't>(
|
||
context: &ParserContext,
|
||
input: &mut Parser<'i, 't>,
|
||
) -> Result<Self, ParseError<'i>> {
|
||
let mut symbols = Vec::new();
|
||
while let Ok(s) = input.try_parse(|input| Symbol::parse(context, input)) {
|
||
symbols.push(s);
|
||
}
|
||
if symbols.is_empty() {
|
||
return Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError));
|
||
}
|
||
Ok(Symbols(symbols.into()))
|
||
}
|
||
}
|
||
|
||
/// <https://drafts.csswg.org/css-counter-styles/#descdef-counter-style-additive-symbols>
|
||
#[derive(Clone, Debug, ToCss, ToShmem)]
|
||
#[css(comma)]
|
||
pub struct AdditiveSymbols(#[css(iterable)] pub crate::OwnedSlice<AdditiveTuple>);
|
||
|
||
impl Parse for AdditiveSymbols {
|
||
fn parse<'i, 't>(
|
||
context: &ParserContext,
|
||
input: &mut Parser<'i, 't>,
|
||
) -> Result<Self, ParseError<'i>> {
|
||
let tuples = Vec::<AdditiveTuple>::parse(context, input)?;
|
||
// FIXME maybe? https://github.com/w3c/csswg-drafts/issues/1220
|
||
if tuples
|
||
.windows(2)
|
||
.any(|window| window[0].weight <= window[1].weight)
|
||
{
|
||
return Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError));
|
||
}
|
||
Ok(AdditiveSymbols(tuples.into()))
|
||
}
|
||
}
|
||
|
||
/// <integer> && <symbol>
|
||
#[derive(Clone, Debug, ToCss, ToShmem)]
|
||
pub struct AdditiveTuple {
|
||
/// <integer>
|
||
pub weight: Integer,
|
||
/// <symbol>
|
||
pub symbol: Symbol,
|
||
}
|
||
|
||
impl OneOrMoreSeparated for AdditiveTuple {
|
||
type S = Comma;
|
||
}
|
||
|
||
impl Parse for AdditiveTuple {
|
||
fn parse<'i, 't>(
|
||
context: &ParserContext,
|
||
input: &mut Parser<'i, 't>,
|
||
) -> Result<Self, ParseError<'i>> {
|
||
let symbol = input.try_parse(|input| Symbol::parse(context, input));
|
||
let weight = Integer::parse_non_negative(context, input)?;
|
||
let symbol = symbol.or_else(|_| Symbol::parse(context, input))?;
|
||
Ok(Self { weight, symbol })
|
||
}
|
||
}
|
||
|
||
/// <https://drafts.csswg.org/css-counter-styles/#counter-style-speak-as>
|
||
#[derive(Clone, Debug, ToCss, ToShmem)]
|
||
pub enum SpeakAs {
|
||
/// auto
|
||
Auto,
|
||
/// bullets
|
||
Bullets,
|
||
/// numbers
|
||
Numbers,
|
||
/// words
|
||
Words,
|
||
// /// spell-out, not supported, see bug 1024178
|
||
// SpellOut,
|
||
/// <counter-style-name>
|
||
Other(CustomIdent),
|
||
}
|
||
|
||
impl Parse for SpeakAs {
|
||
fn parse<'i, 't>(
|
||
_context: &ParserContext,
|
||
input: &mut Parser<'i, 't>,
|
||
) -> Result<Self, ParseError<'i>> {
|
||
let mut is_spell_out = false;
|
||
let result = input.try_parse(|input| {
|
||
let ident = input.expect_ident().map_err(|_| ())?;
|
||
match_ignore_ascii_case! { &*ident,
|
||
"auto" => Ok(SpeakAs::Auto),
|
||
"bullets" => Ok(SpeakAs::Bullets),
|
||
"numbers" => Ok(SpeakAs::Numbers),
|
||
"words" => Ok(SpeakAs::Words),
|
||
"spell-out" => {
|
||
is_spell_out = true;
|
||
Err(())
|
||
},
|
||
_ => Err(()),
|
||
}
|
||
});
|
||
if is_spell_out {
|
||
// spell-out is not supported, but don’t parse it as a <counter-style-name>.
|
||
// See bug 1024178.
|
||
return Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError));
|
||
}
|
||
result.or_else(|_| Ok(SpeakAs::Other(parse_counter_style_name(input)?)))
|
||
}
|
||
}
|