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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.


/// A keyframes selector is a list of percentages or from/to symbols, which are converted at parse time to percentages.
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct KeyframeSelector(pub Vec<KeyframePercentage>);

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

impl KeyframeSelector
{
	/// Return the list of percentages this selector contains.
	#[inline]
	pub fn percentages(&self) -> &[KeyframePercentage]
	{
		&self.0
	}
	
	/// Parse a keyframe selector from CSS input.
	pub(crate) fn parse<'i, 't>(input: &mut Parser<'i, 't>) -> Result<Self, ParseError<'i, CustomParseError<'i>>>
	{
		input.parse_comma_separated(KeyframePercentage::parse).map(KeyframeSelector)
	}
}