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.


#[derive(Debug, Copy, Clone, Ord, PartialOrd, Eq, PartialEq, Hash)]
pub struct OurSelectorImpl;

impl SelectorImpl for OurSelectorImpl
{
	type AttrValue = String;
	
	type Identifier = Atom;
	
	type ClassName = Atom;
	
	type LocalName = Atom;
	
	type NamespacePrefix = NamespacePrefix;
	
	type NamespaceUrl = NamespaceUrl;
	
	type BorrowedNamespaceUrl = str;
	
	type BorrowedLocalName = str;
	
	type NonTSPseudoClass = NonTreeStructuralPseudoClass;
	
	type PseudoElement = PseudoElement;
	
	#[inline(always)]
	fn is_active_or_hover(pseudo_class: &Self::NonTSPseudoClass) -> bool
	{
		use self::NonTreeStructuralPseudoClass::*;
		
		match *pseudo_class
		{
			active => true,
			hover => true,
			_ => false,
		}
	}
}

impl OurSelectorImpl
{
	/// Parses a selector
	pub fn parse_selector<'i>(selector_css: &'i str) -> Result<OurSelector, ParseError<'i, CustomParseError<'i>>>
	{
		const LineNumberingIsZeroBased: u32 = 0;
		
		let mut parserInput = ParserInput::new_with_line_number_offset(&selector_css, LineNumberingIsZeroBased);
		let mut input = Parser::new(&mut parserInput);
		
		let applyVendorPrefixToPseudoClasses = HashMap::default();
		let applyVendorPrefixToPseudoElements = HashMap::default();
		let ourSelectorParser = OurSelectorParser
		{
			namespaces: Namespaces::empty(),
			applyVendorPrefixToPseudoClasses: &applyVendorPrefixToPseudoClasses,
			applyVendorPrefixToPseudoElements: &applyVendorPrefixToPseudoElements,
		};
		
		match ourSelectorParser.parse(&mut input)
		{
			Err(error) => Err(error),
			Ok(mut selectors) =>
			{
				let newSelector = selectors.0.drain(..).next().unwrap();
				Ok(newSelector)
			}
		}
	}
	
	/// Applies a vendor prefix to a CSS selector
	#[inline(always)]
	pub fn reparse_with_vendor_prefix<'a>(selector: &OurSelector, applyVendorPrefixToPseudoClasses: &'a HashMap<VendorPrefixablePseudoClassName, VendorPrefix>, applyVendorPrefixToPseudoElements: &'a HashMap<VendorPrefixablePseudoElementName, VendorPrefix>) -> Option<OurSelector>
	{
		const LineNumberingIsZeroBased: u32 = 0;
		
		let originalCss = selector.to_css_string();
		
		let mut parserInput = ParserInput::new_with_line_number_offset(&originalCss, LineNumberingIsZeroBased);
		let mut input = Parser::new(&mut parserInput);
		
		let ourSelectorParser = OurSelectorParser
		{
			namespaces: Namespaces::empty(),
			applyVendorPrefixToPseudoClasses,
			applyVendorPrefixToPseudoElements,
		};
		
		let mut selectors = ourSelectorParser.parse(&mut input).unwrap();
		let newSelector = selectors.0.drain(..).next().unwrap();
		
		if newSelector.to_css_string() != originalCss
		{
			Some(newSelector)
		}
		else
		{
			None
		}
	}
}