css 0.0.5

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
Documentation 
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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.


/// A struct to parse property declarations.
pub(crate) struct PropertyDeclarationParser<'a>
{
	pub(crate) context: &'a ParserContext,
	pub(crate) parsingAKeyFramePropertyDeclarationListSoImportantIsDisallowed: bool,
}

/// In theory, @rules may be present. In practice, none are currently defined (Sep 2017)
impl<'a, 'i> AtRuleParser<'i> for PropertyDeclarationParser<'a>
{
	type PreludeNoBlock = ();
	
	type PreludeBlock = ();
	
	type AtRule = PropertyDeclaration;
	
	type Error = CustomParseError<'i>;
}

impl<'a, 'i> DeclarationParser<'i> for PropertyDeclarationParser<'a>
{
	type Declaration = PropertyDeclaration;
	
	type Error = CustomParseError<'i>;
	
	fn parse_value<'t>(&mut self, name: CowRcStr<'i>, input: &mut Parser<'i, 't>) -> Result<Self::Declaration, ParseError<'i, Self::Error>>
	{
		let sourceLocation = input.current_source_location();
		
		let (vendor_prefix, unprefixedPropertyName) = VendorPrefix::findPrefixIfAnyForAsciiLowerCaseName(name.to_ascii_lowercase());
		
		let name = Atom::from(unprefixedPropertyName);
		
		let value = input.parse_until_before(Delimiter::Bang, |input|
		{
			if let Ok(cssWideKeyword) = input.try(|input| CssWideKeyword::parse(input))
			{
				Ok(UnparsedPropertyValue::CssWideKeyword(cssWideKeyword))
			}
			else
			{
				Ok(UnparsedPropertyValue::SpecifiedValue(SpecifiedValue::parse(self.context, input)?))
			}
		})?;
		
		let importance = Importance::parse(input);
		if self.parsingAKeyFramePropertyDeclarationListSoImportantIsDisallowed && importance.isImportant()
		{
			return Err(ParseError::Custom(CustomParseError::ImportantIsNotAllowedInKeyframePropertyDeclarationValues(sourceLocation)));
		}
		
		input.expect_exhausted()?;
		
		Ok
		(
			PropertyDeclaration
			{
				vendor_prefix,
				name,
				value,
				importance,
			}
		)
	}
}