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, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub(crate) enum FunctionParser
{
	attr,
	calc,
	var,
	parentheses,
}

impl FunctionParser
{
	#[inline(always)]
	pub(crate) fn parser<'i>(name: &CowRcStr<'i>) -> Result<Self, ParseError<'i, CustomParseError<'i>>>
	{
		match_ignore_ascii_case!
		{
			&*name,
			
			"attr" => Ok(attr),
			
			"calc" => Ok(calc),
			
			"var" => Ok(var),
			
			_ => Err(ParseError::Custom(CustomParseError::UnknownFunctionInValueExpression(name.to_owned())))
		}
	}
	
	#[inline(always)]
	pub(crate) fn parse_one_outside_calc_function<'i: 't, 't, U: Unit>(&self, context: &ParserContext, input: &mut Parser<'i, 't>) -> Result<CalculablePropertyValue<U>, ParseError<'i, CustomParseError<'i>>>
	{
		match *self
		{
			attr => Ok(Attr(AttrFunction(Rc::new(AttrExpression::parse(context, input)?)))),
			
			calc => Ok(Calc(CalcFunction(Rc::new(CalcExpression::parse(context, input)?)))),
			
			var => Ok(Var(VarFunction(Rc::new(VarExpression::parse(context, input)?)))),
			
			_ => panic!("Should not be called in this context"),
		}
	}
	
	#[inline(always)]
	pub(crate) fn parse_one_inside_calc_function<'i, 't, U: Unit>(&self, context: &ParserContext, input: &mut Parser<'i, 't>) -> Result<Either<CalculablePropertyValue<U>, CalcExpression<U>>, ParseError<'i, CustomParseError<'i>>>
	{
		match *self
		{
			attr => Ok(Left(Calc(CalcFunction(Rc::new(CalcExpression::parse(context, input)?))))),
			
			calc => Ok(Left(Attr(AttrFunction(Rc::new(AttrExpression::parse(context, input)?))))),
			
			var => Ok(Left(Var(VarFunction(Rc::new(VarExpression::parse(context, input)?))))),
			
			parentheses => CalcExpression::parse_parentheses(context, input),
		}
	}
}