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// This file is part of css. It is subject to the license terms in the COPYRIGHT file found in the top-level directory of this distribution and at https://raw.githubusercontent.com/lemonrock/css/master/COPYRIGHT. No part of predicator, including this file, may be copied, modified, propagated, or distributed except according to the terms contained in the COPYRIGHT file.
// Copyright © 2017 The developers of css. See the COPYRIGHT file in the top-level directory of this distribution and at https://raw.githubusercontent.com/lemonrock/css/master/COPYRIGHT.


/// https://drafts.csswg.org/css-counter-styles/#counter-style-negative
#[derive(Clone, Debug)]
pub struct Negative(pub Symbol, pub Option<Symbol>);

impl ToCss for Negative
{
	fn to_css<W: fmt::Write>(&self, dest: &mut W) -> fmt::Result
	{
		self.0.to_css(dest)?;
		if let Some(ref symbol) = self.1
		{
			dest.write_char(' ')?;
			symbol.to_css(dest)?;
		}
		Ok(())
	}
}

impl Parse for Negative
{
	fn parse<'i, 't>(context: &ParserContext, input: &mut Parser<'i, 't>) -> Result<Self, ParseError<'i, CustomParseError<'i>>>
	{
		Ok
		(
			Negative
			(
			Symbol::parse(context, input)?,
			input.try(|input| Symbol::parse(context, input)).ok(),
			)
		)
	}
}