css 0.0.22

A crate that uses the cssparser and selectors crates to provide a domain model for CSS Stylesheets. Intended to allow effective minification of CSS and CSS transformations such as autoprefixing and removal by other crates
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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.


/// https://drafts.csswg.org/css-counter-styles/#counter-style-system
#[derive(Debug, Clone, Ord, PartialOrd, Eq, PartialEq, Hash)]
pub enum System
{
	/// 'cyclic'
	Cyclic,
	
	/// 'numeric'
	Numeric,
	
	/// 'alphabetic'
	Alphabetic,
	
	/// 'symbolic'
	Symbolic,
	
	/// 'additive'
	Additive,
	
	/// 'fixed <integer>?'
	Fixed
	{
		/// '<integer>?'
		first_symbol_value: Option<i32>
	},
	
	/// 'extends <counter-style-name>'
	Extends(CounterStyleIdent),
}

impl Parse for System
{
	fn parse<'i, 't>(_context: &ParserContext, input: &mut Parser<'i, 't>) -> Result<Self, ParseError<'i, CustomParseError<'i>>>
	{
		use self::System::*;
		
		let identifier = input.expect_ident_cloned()?;
		
		match_ignore_ascii_case!
		{
			&*identifier,
			
            "cyclic" => Ok(Cyclic),
            
            "numeric" => Ok(Numeric),
            
            "alphabetic" => Ok(Alphabetic),
            
            "symbolic" => Ok(Symbolic),
            
            "additive" => Ok(Additive),
            
            "fixed" =>
            {
                let first_symbol_value = input.try(|i| i.expect_integer()).ok();
                Ok(Fixed { first_symbol_value })
            }
            
            "extends" =>  Ok(Extends(CounterStyleIdent::parse(input)?)),
            
            _ => Err(ParseError::Custom(CustomParseError::CounterStyleSystemIsNotKnown(identifier.clone()))),
        }
	}
}

impl ToCss for System
{
	fn to_css<W: fmt::Write>(&self, dest: &mut W) -> fmt::Result
	{
		use self::System::*;
		
		match *self
		{
			Cyclic => dest.write_str("cyclic"),
			
			Numeric => dest.write_str("numeric"),
			
			Alphabetic => dest.write_str("alphabetic"),
			
			Symbolic => dest.write_str("symbolic"),
			
			Additive => dest.write_str("additive"),
			
			Fixed { first_symbol_value } =>
			{
				if let Some(value) = first_symbol_value
				{
					dest.write_str("fixed ")?;
					value.to_css(dest)
				}
				else
				{
					dest.write_str("fixed")
				}
			}
			
			Extends(ref other) =>
			{
				dest.write_str("extends ")?;
				other.to_css(dest)
			}
		}
	}
}