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.


/// A @font-feature-values block declaration value that keeps a list of values.
#[derive(Clone, Debug, PartialEq)]
pub struct VectorValues(pub Vec<u32>);

impl Parse for VectorValues
{
	fn parse<'i, 't>(_context: &ParserContext, input: &mut Parser<'i, 't>) -> Result<VectorValues, ParseError<'i, CustomParseError<'i>>>
	{
		let mut vec = vec![];
		loop
		{
			match input.next()
			{
				Ok(&Token::Number { int_value: Some(a), .. }) if a >= 0 =>
				{
					vec.push(a as u32);
				},

				// It can't be anything other than number.
				Ok(unexpectedToken) => return CustomParseError::unexpectedToken(unexpectedToken),

				Err(_) => break,
			}
		}

		if vec.len() == 0
		{
			return Err(BasicParseError::EndOfInput.into());
		}

		Ok(VectorValues(vec))
	}
}

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