css 0.0.22

// 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/#descdef-counter-style-symbols
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct Symbols(pub Vec<Symbol>);

impl ToCss for Symbols
{
	fn to_css<W: Write>(&self, dest: &mut W) -> fmt::Result
	{
		let mut iter = self.0.iter();
		let first = iter.next().unwrap();
		first.to_css(dest)?;
		for item in iter
		{
			dest.write_char(' ')?;
			item.to_css(dest)?;
		}
		Ok(())
	}
}

impl Parse for Symbols
{
	fn parse<'i, 't>(context: &ParserContext, input: &mut Parser<'i, 't>) -> Result<Self, ParseError<'i, CustomParseError<'i>>>
	{
		let mut symbols = Vec::new();
		loop
		{
			if let Ok(s) = input.try(|input| Symbol::parse(context, input))
			{
				symbols.push(s)
			}
			else
			{
				if symbols.is_empty()
				{
					return Err(ParseError::Custom(CustomParseError::CounterStyleSymbolsCanNotBeEmpty))
				}
				else
				{
					return Ok(Symbols(symbols))
				}
			}
		}
	}
}