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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.


/// No Charset here, CSSCharsetRule has been removed from CSSOM (https://drafts.csswg.org/cssom/#changes-from-5-december-2013) and Edge doesn't support it
#[derive(Debug, Clone)]
pub enum CssRule
{
	/// @counter-style
	CounterStyle(CounterStyleAtRule),
	
	/// @document
	Document(DocumentAtRule),
	
	/// @font-face
	FontFace(FontFaceAtRule),
	
	/// @font-feature-values
	FontFeatureValues(FontFeatureValuesAtRule),
	
	/// @import
	Import(ImportAtRule),
	
	/// @keyframes
	Keyframes(KeyframesAtRule),
	
	/// @media
	Media(MediaAtRule),
	
	/// @namespace
	Namespace(NamespaceAtRule),
	
	/// @page
	Page(PageAtRule),
	
	/// Style rules, eg `div { width: 10%; }`
	Style(StyleRule),
	
	/// @supports
	Supports(SupportsAtRule),
	
	/// @viewport
	Viewport(ViewportAtRule),
}

impl ToCss for CssRule
{
	/// https://drafts.csswg.org/cssom/#serialize-a-css-rule
	fn to_css<W: fmt::Write>(&self, dest: &mut W) -> fmt::Result
	{
		use self::CssRule::*;
		
		match *self
		{
			CounterStyle(ref rule) => rule.to_css(dest),
			
			Document(ref rule) => rule.to_css(dest),
			
			FontFace(ref rule) => rule.to_css(dest),
			
			FontFeatureValues(ref rule) => rule.to_css(dest),
			
			Import(ref rule) => rule.to_css(dest),
			
			Keyframes(ref rule) => rule.to_css(dest),
			
			Media(ref rule) => rule.to_css(dest),
			
			Namespace(ref rule) => rule.to_css(dest),
			
			Page(ref rule) => rule.to_css(dest),
			
			Style(ref rule) => rule.to_css(dest),
			
			Supports(ref rule) => rule.to_css(dest),
			
			Viewport(ref rule) => rule.to_css(dest),
		}
	}
}

impl CssRule
{
	/// Returns the CSSOM rule type of this rule.
	#[inline(always)]
	pub fn rule_type(&self) -> CssRuleType
	{
		use self::CssRule::*;
		
		match *self
		{
			CounterStyle(_) => CssRuleType::CounterStyle,
			
			Document(_)  => CssRuleType::Document,
			
			FontFace(_) => CssRuleType::FontFace,
			
			FontFeatureValues(_) => CssRuleType::FontFeatureValues,
			
			Import(_) => CssRuleType::Import,
			
			Keyframes(_) => CssRuleType::Keyframes,
			
			Media(_) => CssRuleType::Media,
			
			Namespace(_) => CssRuleType::Namespace,
			
			Page(_) => CssRuleType::Page,
			
			Style(_) => CssRuleType::Style,
			
			Supports(_) => CssRuleType::Supports,
			
			Viewport(_) => CssRuleType::Viewport,
		}
	}
}