css 0.0.22

// 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 enum LengthOrPercentageUnit<Number: CssNumber>
{
	IsLength(LengthUnit<Number>),
	IsPercentage(PercentageUnit<Number>)
}

impl<Number: CssNumber> ToCss for LengthOrPercentageUnit<Number>
{
	fn to_css<W: fmt::Write>(&self, dest: &mut W) -> fmt::Result
	{
		use self::LengthOrPercentageUnit::*;
		match *self
		{
			IsLength(ref length) => length.to_css(dest),
			IsPercentage(ref length) => length.to_css(dest),
		}
	}
}

impl<Number: CssNumber> Default for LengthOrPercentageUnit<Number>
{
	#[inline(always)]
	fn default() -> Self
	{
		LengthOrPercentageUnit::IsLength(LengthUnit::default())
	}
}

impl<Number: CssNumber> Add<Number> for LengthOrPercentageUnit<Number>
{
	type Output = Self;
	
	#[inline(always)]
	fn add(self, rhs: Number) -> Self::Output
	{
		use self::LengthOrPercentageUnit::*;
		match self
		{
			IsLength(length) => IsLength(length + rhs),
			IsPercentage(length) => IsPercentage(length + rhs),
		}
	}
}

impl<Number: CssNumber> AddAssign<Number> for LengthOrPercentageUnit<Number>
{
	#[inline(always)]
	fn add_assign(&mut self, rhs: Number)
	{
		use self::LengthOrPercentageUnit::*;
		match *self
		{
			IsLength(ref mut length) => *length = *length + rhs,
			IsPercentage(ref mut length) => *length = *length + rhs,
		}
	}
}

impl<Number: CssNumber> Sub<Number> for LengthOrPercentageUnit<Number>
{
	type Output = Self;
	
	#[inline(always)]
	fn sub(self, rhs: Number) -> Self::Output
	{
		use self::LengthOrPercentageUnit::*;
		match self
		{
			IsLength(length) => IsLength(length - rhs),
			IsPercentage(length) => IsPercentage(length - rhs),
		}
	}
}

impl<Number: CssNumber> SubAssign<Number> for LengthOrPercentageUnit<Number>
{
	#[inline(always)]
	fn sub_assign(&mut self, rhs: Number)
	{
		use self::LengthOrPercentageUnit::*;
		match *self
		{
			IsLength(ref mut length) => *length = *length - rhs,
			IsPercentage(ref mut length) => *length = *length - rhs,
		}
	}
}

impl<Number: CssNumber> Mul<Number> for LengthOrPercentageUnit<Number>
{
	type Output = Self;
	
	#[inline(always)]
	fn mul(self, rhs: Number) -> Self::Output
	{
		use self::LengthOrPercentageUnit::*;
		match self
		{
			IsLength(length) => IsLength(length * rhs),
			IsPercentage(length) => IsPercentage(length * rhs),
		}
	}
}

impl<Number: CssNumber> MulAssign<Number> for LengthOrPercentageUnit<Number>
{
	#[inline(always)]
	fn mul_assign(&mut self, rhs: Number)
	{
		use self::LengthOrPercentageUnit::*;
		match *self
		{
			IsLength(ref mut length) => *length = *length * rhs,
			IsPercentage(ref mut length) => *length = *length * rhs,
		}
	}
}

impl<Number: CssNumber> Div<Number> for LengthOrPercentageUnit<Number>
{
	type Output = Self;
	
	#[inline(always)]
	fn div(self, rhs: Number) -> Self::Output
	{
		use self::LengthOrPercentageUnit::*;
		match self
		{
			IsLength(length) => IsLength(length / rhs),
			IsPercentage(length) => IsPercentage(length / rhs),
		}
	}
}

impl<Number: CssNumber> DivAssign<Number> for LengthOrPercentageUnit<Number>
{
	#[inline(always)]
	fn div_assign(&mut self, rhs: Number)
	{
		use self::LengthOrPercentageUnit::*;
		match *self
		{
			IsLength(ref mut length) => *length = *length / rhs,
			IsPercentage(ref mut length) => *length = *length / rhs,
		}
	}
}

impl<Number: CssNumber> Rem<Number> for LengthOrPercentageUnit<Number>
{
	type Output = Self;
	
	#[inline(always)]
	fn rem(self, rhs: Number) -> Self::Output
	{
		use self::LengthOrPercentageUnit::*;
		match self
		{
			IsLength(length) => IsLength(length % rhs),
			IsPercentage(length) => IsPercentage(length % rhs),
		}
	}
}

impl<Number: CssNumber> RemAssign<Number> for LengthOrPercentageUnit<Number>
{
	#[inline(always)]
	fn rem_assign(&mut self, rhs: Number)
	{
		use self::LengthOrPercentageUnit::*;
		match *self
		{
			IsLength(ref mut length) => *length = *length % rhs,
			IsPercentage(ref mut length) => *length = *length % rhs,
		}
	}
}

impl<Number: CssNumber> Neg for LengthOrPercentageUnit<Number>
{
	type Output = Self;
	
	#[inline(always)]
	fn neg(self) -> Self::Output
	{
		use self::LengthOrPercentageUnit::*;
		match self
		{
			IsLength(length) => IsLength(-length),
			IsPercentage(length) => IsPercentage(-length),
		}
	}
}

impl<Number: CssNumber> CssNumberNewType <Number>for LengthOrPercentageUnit<Number>
{
	#[inline(always)]
	fn to_f32(&self) -> f32
	{
		self.to_CssNumber().to_f32()
	}
	
	#[inline(always)]
	fn as_CssNumber(&self) -> &Number
	{
		use self::LengthOrPercentageUnit::*;
		match *self
		{
			IsLength(ref length) => length.as_CssNumber(),
			IsPercentage(ref length) => length.as_CssNumber(),
		}
	}
}

impl<NumberX: CssNumber> Unit for LengthOrPercentageUnit<NumberX>
{
	type Number = NumberX;
	
	const HasDimension: bool = true;
	
	#[inline(always)]
	fn parse_one_outside_calc_function<'i, 't>(context: &ParserContext, input: &mut Parser<'i, 't>) -> Result<CalculablePropertyValue<Self>, ParseError<'i, CustomParseError<'i>>>
	{
		use self::LengthOrPercentageUnit::*;
		use self::CalculablePropertyValue::*;
		
		let functionParser = match *input.next()?
		{
			Token::Number { value, .. } => return LengthUnit::parseUnitLessNumber(value, context.parsing_mode_allows_unitless_lengths()).map(|value| Constant(IsLength(value))),
			
			Token::Dimension { value, ref unit, .. } => return LengthUnit::parseDimension(value, unit, context.isNotInPageRule()).map(|value| Constant(IsLength(value))),
			
			Token::Percentage { unit_value, .. } => return PercentageUnit::parse_percentage(unit_value).map(|value| Constant(IsPercentage(value))),
			
			Token::Function(ref name) => FunctionParser::parser(name)?,
			
			ref unexpectedToken @ _ => return CustomParseError::unexpectedToken(unexpectedToken),
		};
		functionParser.parse_one_outside_calc_function(context, input)
	}
	
	#[inline(always)]
	fn parse_one_inside_calc_function<'i, 't>(context: &ParserContext, input: &mut Parser<'i, 't>) -> Result<Either<CalculablePropertyValue<Self>, CalcExpression<Self>>, ParseError<'i, CustomParseError<'i>>>
	{
		use self::LengthOrPercentageUnit::*;
		use self::CalculablePropertyValue::*;
		
		let functionParser = match *input.next()?
		{
			Token::Number { value, .. } => return Self::number_inside_calc_function(value),
			
			Token::Dimension { value, ref unit, .. } => return LengthUnit::parseDimension(value, unit, context.isNotInPageRule()).map(|value| Left(Constant(IsLength(value)))),
			
			Token::Percentage { unit_value, .. } => return PercentageUnit::parse_percentage(unit_value).map(|value| Left(Constant(IsPercentage(value)))),
			
			Token::ParenthesisBlock => FunctionParser::parentheses,
			
			Token::Function(ref name) => FunctionParser::parser(name)?,
			
			ref unexpectedToken @ _ => return CustomParseError::unexpectedToken(unexpectedToken),
		};
		functionParser.parse_one_inside_calc_function(context, input)
	}
	
	#[inline(always)]
	fn to_canonical_dimension_value<Conversion: FontRelativeLengthConversion<Self::Number> + ViewportPercentageLengthConversion<Self::Number> + PercentageConversion<Self::Number>>(&self, conversion: &Conversion) -> Self::Number
	{
		use self::LengthOrPercentageUnit::*;
		
		match *self
		{
			IsLength(ref length) => length.to_canonical_dimension_value(conversion),
			IsPercentage(ref percentage) => percentage.to_canonical_dimension_value(conversion),
		}
	}
	
	#[inline(always)]
	fn from_raw_css_for_var_expression_evaluation(value: &str, is_not_in_page_rule: bool) -> Option<Self>
	{
		use self::LengthOrPercentageUnit::*;
		
		fn from_raw_css_for_var_expression_evaluation_internal<'i: 't, 't, Number: CssNumber>(is_not_in_page_rule: bool, input: &mut Parser<'i, 't>) -> Result<LengthOrPercentageUnit<Number>, ParseError<'i, CustomParseError<'i>>>
		{
			let value = match *input.next()?
			{
				Token::Number { value, .. } => LengthUnit::parseUnitLessNumber(value, false).map(IsLength),
				
				Token::Percentage { unit_value, .. } => PercentageUnit::parse_percentage(unit_value).map(|value| IsPercentage(value)),
				
				Token::Dimension { value, ref unit, .. } => LengthUnit::parseDimension(value, unit, is_not_in_page_rule).map(IsLength),
				
				ref unexpectedToken @ _ => CustomParseError::unexpectedToken(unexpectedToken),
			};
			
			input.skip_whitespace();
			
			input.expect_exhausted()?;
			
			value
		}
		
		const LineNumberingIsZeroBased: u32 = 0;
		
		let mut parserInput = ParserInput::new_with_line_number_offset(value, LineNumberingIsZeroBased);
		let mut input = Parser::new(&mut parserInput);
		
		from_raw_css_for_var_expression_evaluation_internal(is_not_in_page_rule, &mut input).ok()
	}
}

impl<Number: CssNumber> LengthOrPercentageUnit<Number>
{
	/// Get an absolute length using a conversion
	#[inline(always)]
	pub fn to_px<Conversion: FontRelativeLengthConversion<Number> + ViewportPercentageLengthConversion<Number> + PercentageConversion<Number>>(&self, conversion: &Conversion) -> Number
	{
		use self::LengthOrPercentageUnit::*;
		
		match *self
		{
			IsLength(ref length) => length.to_px(conversion),
			IsPercentage(ref percentage) => percentage.to_absolute_value(conversion),
		}
	}
	
	/// Convert this into AppUnits.
	#[inline]
	pub fn to_app_units<Conversion: FontRelativeLengthConversion<Number> + ViewportPercentageLengthConversion<Number> + PercentageConversion<Number>>(&self, conversion: &Conversion) -> Number
	{
		self.to_px(conversion) * Number::AppUnitsPerPX
	}
}