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.


/// An enum to represent a CSS-wide keyword.
#[derive(Debug, Copy, Clone, Ord, PartialOrd, Eq, PartialEq, Hash)]
pub enum CssWideKeyword
{
	/// The `initial` keyword.
	initial,
	
	/// The `inherit` keyword.
	inherit,
	
	/// The `unset` keyword.
	unset,
}

impl ToCss for CssWideKeyword
{
	fn to_css<W: fmt::Write>(&self, dest: &mut W) -> fmt::Result
	{
		use self::CssWideKeyword::*;
		
		let value = match *self
		{
			initial => "initial",
			inherit => "inherit",
			unset => "unset",
		};
		
		dest.write_str(value)
	}
}

impl CssWideKeyword
{
	#[inline(always)]
	pub fn to_str(&self) -> &'static str
	{
		use self::CssWideKeyword::*;
		
		match *self
		{
			initial => "initial",
			inherit => "inherit",
			unset => "unset",
		}
	}
	
	#[inline(always)]
	fn from_ident<'i>(ident: &str) -> Option<Self>
	{
		use self::CssWideKeyword::*;
		
		match_ignore_ascii_case!
		{
			ident,
			
			"initial" => Some(initial),
			
			"inherit" => Some(inherit),
			
			"unset" => Some(unset),
			
			_ => None
		}
	}
	
	#[inline(always)]
	pub(crate) fn parse(input: &mut Parser) -> Result<Self, ()>
	{
		let ident = input.expect_ident().map_err(|_| ())?.clone();
		input.expect_exhausted().map_err(|_| ())?;
		Self::from_ident(&ident).ok_or(())
	}
}