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.


#[derive(Debug, Copy, Clone, Ord, PartialOrd, Eq, PartialEq, Hash)]
pub enum FontLanguageOverride
{
	normal,
	Override(OpenTypeLanguageTag),
}

impl ToCss for FontLanguageOverride
{
	fn to_css<W: fmt::Write>(&self, dest: &mut W) -> fmt::Result
	{
		use self::FontLanguageOverride::*;;
		
		match *self
		{
			normal => serialize_identifier("normal", dest),
			Override(openTypeLanguageTag) => openTypeLanguageTag.to_css(dest),
		}
	}
}

impl FontLanguageOverride
{
	/// Parse a font-family value
	pub(crate) fn parse<'i, 't>(input: &mut Parser<'i, 't>) -> Result<Self, ParseError<'i, CustomParseError<'i>>>
	{
		use self::FontLanguageOverride::*;;
		
		if let Ok(value) = input.try::<>(|input|
		{
			match input.expect_string()
			{
				Err(_) => Err(()),
				Ok(value) =>
				{
					match OpenTypeLanguageTag::parse(value)
					{
						Err(_) => Err(()),
						Ok(openTypeLanguageTag) => Ok(Override(openTypeLanguageTag))
					}
				}
			}
		})
		{
			return Ok(value)
		}
		
		let identifier = input.expect_ident()?.clone();
		match_ignore_ascii_case!
		{
			&identifier,
			
			"normal" => Ok(normal),
			
			_ => Err(ParseError::Custom(CustomParseError::InvalidFontLanguageOverrideIdentifier(identifier.clone()))),
		}
	}
}