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.


/// A CSS integer value similar to u32
#[derive(Debug, Copy, Clone, Ord, PartialOrd, Eq, PartialEq, Hash)]
pub struct CssUnsignedInteger(u32);

impl ToCss for CssUnsignedInteger
{
	#[inline(always)]
	fn to_css<W: fmt::Write>(&self, dest: &mut W) -> fmt::Result
	{
		self.0.to_css(dest)
	}
}

impl Display for CssUnsignedInteger
{
	#[inline(always)]
	fn fmt(&self, fmt: &mut Formatter) -> fmt::Result
	{
		<u32 as Display>::fmt(&self.0, fmt)
	}
}

impl Default for CssUnsignedInteger
{
	#[inline(always)]
	fn default() -> Self
	{
		Self::Zero
	}
}

impl Add<CssUnsignedInteger> for CssUnsignedInteger
{
	type Output = Self;
	
	#[inline(always)]
	fn add(self, rhs: CssUnsignedInteger) -> Self::Output
	{
		CssUnsignedInteger(self.0 + rhs.0)
	}
}

impl AddAssign<CssUnsignedInteger> for CssUnsignedInteger
{
	#[inline(always)]
	fn add_assign(&mut self, rhs: CssUnsignedInteger)
	{
		*self = self.add(rhs)
	}
}

impl Sub<CssUnsignedInteger> for CssUnsignedInteger
{
	type Output = Self;
	
	#[inline(always)]
	fn sub(self, rhs: CssUnsignedInteger) -> Self::Output
	{
		CssUnsignedInteger(self.0 - rhs.0)
	}
}

impl SubAssign<CssUnsignedInteger> for CssUnsignedInteger
{
	#[inline(always)]
	fn sub_assign(&mut self, rhs: CssUnsignedInteger)
	{
		*self = self.sub(rhs)
	}
}

impl Mul<CssUnsignedInteger> for CssUnsignedInteger
{
	type Output = Self;
	
	#[inline(always)]
	fn mul(self, rhs: CssUnsignedInteger) -> Self::Output
	{
		CssUnsignedInteger(self.0 * rhs.0)
	}
}

impl MulAssign<CssUnsignedInteger> for CssUnsignedInteger
{
	#[inline(always)]
	fn mul_assign(&mut self, rhs: CssUnsignedInteger)
	{
		*self = self.mul(rhs)
	}
}

impl Div<CssUnsignedInteger> for CssUnsignedInteger
{
	type Output = Self;
	
	#[inline(always)]
	fn div(self, rhs: CssUnsignedInteger) -> Self::Output
	{
		if rhs.0 == 0
		{
			CssUnsignedInteger(::std::u32::MAX)
		}
		else
		{
			CssUnsignedInteger(self.0 / rhs.0)
		}
	}
}

impl DivAssign<CssUnsignedInteger> for CssUnsignedInteger
{
	#[inline(always)]
	fn div_assign(&mut self, rhs: CssUnsignedInteger)
	{
		*self = self.div(rhs)
	}
}

impl Rem<CssUnsignedInteger> for CssUnsignedInteger
{
	type Output = Self;
	
	#[inline(always)]
	fn rem(self, rhs: CssUnsignedInteger) -> Self::Output
	{
		CssUnsignedInteger(self.0 % rhs.0)
	}
}

impl RemAssign<CssUnsignedInteger> for CssUnsignedInteger
{
	#[inline(always)]
	fn rem_assign(&mut self, rhs: CssUnsignedInteger)
	{
		*self = self.rem(rhs)
	}
}

impl Neg for CssUnsignedInteger
{
	type Output = Self;
	
	#[inline(always)]
	fn neg(self) -> Self::Output
	{
		if self.is_zero()
		{
			self
		}
		else
		{
			CssUnsignedInteger(0)
		}
	}
}

impl CssNumberNewType<Self> for CssUnsignedInteger
{
	#[inline(always)]
	fn to_f32(&self) -> f32
	{
		self.0 as f32
	}
	
	#[inline(always)]
	fn as_CssNumber(&self) -> &CssUnsignedInteger
	{
		self
	}
	
	#[inline(always)]
	fn is_zero(&self) -> bool
	{
		self.0 == 0
	}
	
	#[inline(always)]
	fn is_positive(&self) -> bool
	{
		self.0 != 0
	}
	
	#[inline(always)]
	fn is_negative(&self) -> bool
	{
		false
	}
	
	#[inline(always)]
	fn is_zero_or_positive(&self) -> bool
	{
		true
	}
	
	#[inline(always)]
	fn is_zero_or_negative(&self) -> bool
	{
		self.is_zero()
	}
}

impl Deref for CssUnsignedInteger
{
	type Target = u32;
	
	#[inline(always)]
	fn deref(&self) -> &Self::Target
	{
		&self.0
	}
}

impl From<u32> for CssUnsignedInteger
{
	#[inline(always)]
	fn from(small: u32) -> CssUnsignedInteger
	{
		CssUnsignedInteger(small)
	}
}

impl From<u16> for CssUnsignedInteger
{
	#[inline(always)]
	fn from(small: u16) -> CssUnsignedInteger
	{
		CssUnsignedInteger(small as u32)
	}
}

impl From<u8> for CssUnsignedInteger
{
	#[inline(always)]
	fn from(small: u8) -> CssUnsignedInteger
	{
		CssUnsignedInteger(small as u32)
	}
}

impl FromStr for CssUnsignedInteger
{
	type Err = ParseIntError;
	
	fn from_str(s: &str) -> Result<Self, Self::Err>
	{
		let value = u32::from_str(s)?;
		Ok(CssUnsignedInteger(value))
	}
}

impl CssNumber for CssUnsignedInteger
{
	const Zero: Self = CssUnsignedInteger(0);
	
	const One: Self = CssUnsignedInteger(1);
	
	const Maximum: Self = CssUnsignedInteger(::std::u32::MAX);
	
	const Minimum: Self = CssUnsignedInteger(::std::u32::MIN);
	
	const DotsPerInch: Self = CssUnsignedInteger(96);
	
	const CentimetresPerInch: Self = CssUnsignedInteger(2);
	
	#[inline(always)]
	fn as_f32(&self) -> f32
	{
		self.0 as f32
	}
	
	#[inline(always)]
	fn as_u32(&self) -> u32
	{
		self.0
	}
	
	#[inline(always)]
	fn round(self) -> Self
	{
		self
	}
	
	#[inline(always)]
	fn abs(self) -> Self
	{
		self
	}
	
	#[doc(hidden)]
	#[inline(always)]
	fn _construct(value: f32) -> Self
	{
		CssUnsignedInteger(value as u32)
	}
	
	#[inline(always)]
	fn new(value: f32) -> Result<Self, CssNumberConversionError>
	{
		if value.is_sign_negative()
		{
			Err(CssNumberConversionError::NegativeNumberMayNotBeAllowed)
		}
		else if value == 0.0
		{
			Ok(CssUnsignedInteger(0))
		}
		else
		{
			let cast = value as u32;
			if f32::from_bits(cast) == value
			{
				Ok(CssUnsignedInteger(0))
			}
			else
			{
				Err(CssNumberConversionError::FloatingPointNumberMayNotBeAllowed)
			}
		}
	}
	
	#[inline(always)]
	fn parseNumber<'i>(value: f32, int_value: Option<i32>) -> Result<Self, ParseError<'i, CustomParseError<'i>>>
	{
		if let Some(constant) = int_value
		{
			if constant >= 0
			{
				Ok(CssUnsignedInteger(constant as u32))
			}
			else
			{
				Err(ParseError::Custom(CustomParseError::UnsignedIntegersCanNotBeNegative(constant)))
			}
		}
		else
		{
			Err(ParseError::Custom(CustomParseError::UnsignedIntegersCanNotBeFloats(value)))
		}
	}
}

impl AppUnitsPer for CssUnsignedInteger
{
	/// Number of app units per pixel
	const AppUnitsPerPX: Self = CssUnsignedInteger(f32::AppUnitsPerPX as u32);
	
	/// Number of app units per inch
	const AppUnitsPerIN: Self = CssUnsignedInteger(f32::AppUnitsPerIN as u32);
	
	/// Number of app units per centimeter
	const AppUnitsPerCM: Self = CssUnsignedInteger(f32::AppUnitsPerCM as u32);
	
	/// Number of app units per millimeter
	const AppUnitsPerMM: Self = CssUnsignedInteger(f32::AppUnitsPerMM as u32);
	
	/// Number of app units per quarter
	const AppUnitsPerQ: Self = CssUnsignedInteger(f32::AppUnitsPerQ as u32);
	
	/// Number of app units per point
	const AppUnitsPerPT: Self = CssUnsignedInteger(f32::AppUnitsPerPT as u32);
	
	/// Number of app units per pica
	const AppUnitsPerPC: Self = CssUnsignedInteger(f32::AppUnitsPerPC as u32);
}

impl Unit for CssUnsignedInteger
{
	type Number = Self;
	
	const HasDimension: bool = false;
	
	#[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::CalculablePropertyValue::*;
		
		let functionParser = match *input.next()?
		{
			Token::Number { int_value, value, .. } => return Self::parseNumber(value, int_value).map(Constant),
			
			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::CalculablePropertyValue::*;
		
		let functionParser = match *input.next()?
		{
			Token::Number { value, int_value, .. } => return Self::parseNumber(value, int_value).map(|value| Left(Constant(value))),
			
			Token::Percentage { unit_value, .. } => return PercentageUnit::parse_percentage(unit_value).map(|value| Left(Percentage(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
	{
		self.to_CssNumber()
	}
	
	#[inline(always)]
	fn from_raw_css_for_var_expression_evaluation(value: &str, _is_not_in_page_rule: bool) -> Option<Self>
	{
		fn from_raw_css_for_var_expression_evaluation_internal<'i: 't, 't>(input: &mut Parser<'i, 't>) -> Result<CssUnsignedInteger, ParseError<'i, CustomParseError<'i>>>
		{
			let value = match *input.next()?
			{
				Token::Number { value, int_value, .. } => CssUnsignedInteger::parseNumber(value, int_value),
				
				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(&mut input).ok()
	}
}