servo/components/style/values/specified/counters.rs

/* 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 http://mozilla.org/MPL/2.0/. */

//! Specified types for counter properties.

#[cfg(feature = "servo")]
use computed_values::list_style_type::T as ListStyleType;
use cssparser::{Parser, Token};
use parser::{Parse, ParserContext};
use style_traits::{ParseError, StyleParseErrorKind};
use values::CustomIdent;
#[cfg(feature = "gecko")]
use values::generics::CounterStyleOrNone;
use values::generics::counters::CounterIncrement as GenericCounterIncrement;
use values::generics::counters::CounterReset as GenericCounterReset;
#[cfg(feature = "gecko")]
use values::specified::Attr;
use values::specified::Integer;
#[cfg(feature = "gecko")]
use values::specified::url::SpecifiedImageUrl;

/// A specified value for the `counter-increment` property.
pub type CounterIncrement = GenericCounterIncrement<Integer>;

impl Parse for CounterIncrement {
    fn parse<'i, 't>(
        context: &ParserContext,
        input: &mut Parser<'i, 't>,
    ) -> Result<Self, ParseError<'i>> {
        Ok(Self::new(parse_counters(context, input, 1)?))
    }
}

/// A specified value for the `counter-increment` property.
pub type CounterReset = GenericCounterReset<Integer>;

impl Parse for CounterReset {
    fn parse<'i, 't>(
        context: &ParserContext,
        input: &mut Parser<'i, 't>,
    ) -> Result<Self, ParseError<'i>> {
        Ok(Self::new(parse_counters(context, input, 0)?))
    }
}

fn parse_counters<'i, 't>(
    context: &ParserContext,
    input: &mut Parser<'i, 't>,
    default_value: i32,
) -> Result<Vec<(CustomIdent, Integer)>, ParseError<'i>> {
    if input
        .try(|input| input.expect_ident_matching("none"))
        .is_ok()
    {
        return Ok(vec![]);
    }

    let mut counters = Vec::new();
    loop {
        let location = input.current_source_location();
        let counter_name = match input.next() {
            Ok(&Token::Ident(ref ident)) => CustomIdent::from_ident(location, ident, &["none"])?,
            Ok(t) => return Err(location.new_unexpected_token_error(t.clone())),
            Err(_) => break,
        };

        let counter_delta = input
            .try(|input| Integer::parse(context, input))
            .unwrap_or(Integer::new(default_value));
        counters.push((counter_name, counter_delta))
    }

    if !counters.is_empty() {
        Ok(counters)
    } else {
        Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError))
    }
}

#[cfg(feature = "servo")]
type CounterStyleType = ListStyleType;

#[cfg(feature = "gecko")]
type CounterStyleType = CounterStyleOrNone;

#[cfg(feature = "servo")]
#[inline]
fn is_decimal(counter_type: &CounterStyleType) -> bool {
    *counter_type == ListStyleType::Decimal
}

#[cfg(feature = "gecko")]
#[inline]
fn is_decimal(counter_type: &CounterStyleType) -> bool {
    *counter_type == CounterStyleOrNone::decimal()
}

/// The specified value for the `content` property.
///
/// https://drafts.csswg.org/css-content/#propdef-content
#[derive(Clone, Debug, Eq, MallocSizeOf, PartialEq, ToComputedValue, ToCss)]
pub enum Content {
    /// `normal` reserved keyword.
    Normal,
    /// `none` reserved keyword.
    None,
    /// `-moz-alt-content`.
    #[cfg(feature = "gecko")]
    MozAltContent,
    /// Content items.
    Items(#[css(iterable)] Box<[ContentItem]>),
}

/// Items for the `content` property.
#[derive(Clone, Debug, Eq, MallocSizeOf, PartialEq, ToComputedValue, ToCss)]
pub enum ContentItem {
    /// Literal string content.
    String(Box<str>),
    /// `counter(name, style)`.
    #[css(comma, function)]
    Counter(CustomIdent, #[css(skip_if = "is_decimal")] CounterStyleType),
    /// `counters(name, separator, style)`.
    #[css(comma, function)]
    Counters(
        CustomIdent,
        Box<str>,
        #[css(skip_if = "is_decimal")] CounterStyleType,
    ),
    /// `open-quote`.
    OpenQuote,
    /// `close-quote`.
    CloseQuote,
    /// `no-open-quote`.
    NoOpenQuote,
    /// `no-close-quote`.
    NoCloseQuote,
    /// `attr([namespace? `|`]? ident)`
    #[cfg(feature = "gecko")]
    Attr(Attr),
    /// `url(url)`
    #[cfg(feature = "gecko")]
    Url(SpecifiedImageUrl),
}