css 0.0.5

// 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 `@viewport` rule.
#[derive(Clone, Debug, PartialEq)]
pub struct ViewportAtRule
{
	pub vendor_prefix: Option<VendorPrefix>,
	
	/// The declarations contained in this @viewport rule.
	pub declarations: Vec<ViewportDescriptorDeclaration>
}

impl ViewportAtRule
{
	/// Parse a single @viewport rule.
	pub(crate) fn parse_body<'i, 't>(vendor_prefix: Option<VendorPrefix>, context: &ParserContext, input: &mut Parser<'i, 't>) -> Result<Self, ParseError<'i, CustomParseError<'i>>>
	{
		let parser = ViewportAtRuleParser { context };
		
		let mut declarations = Vec::new();
		let mut parser = DeclarationListParser::new(input, parser);
		while let Some(result) = parser.next()
		{
			match result
			{
				Ok(viewportDescriptorDeclaration) =>
				{
					declarations.push(viewportDescriptorDeclaration);
				}
				
				Err(preciseParseError) => return Err(preciseParseError.error),
			}
		}
		Ok(Self { vendor_prefix, declarations })
	}
}

impl ToCss for ViewportAtRule
{
	fn to_css<W: fmt::Write>(&self, dest: &mut W) -> fmt::Result
	{
		dest.write_char('@')?;
		if let Some(ref vendorPrefix) = self.vendor_prefix
		{
			vendorPrefix.to_css(dest)?;
		}
		dest.write_str("viewport{")?;
		let mut iter = self.declarations.iter();
		iter.next().unwrap().to_css(dest)?;
		for declaration in iter
		{
			declaration.to_css(dest)?;
		}
		dest.write_char('}')
	}
}

impl HasVendorPrefix for ViewportAtRule
{
	#[inline(always)]
	fn isNotVendorPrefixed(&self) -> bool
	{
		self.vendor_prefix.is_none()
	}
}