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.


/// A font-weight value for a @font-face rule.
/// The font-weight CSS property specifies the weight or boldness of the font.
#[derive(Debug, Copy, Clone, Ord, PartialOrd, Eq, PartialEq, Hash)]
pub enum FontWeight
{
	_100,
	_200,
	_300,
	_400,
	_500,
	_600,
	_700,
	_800,
	_900,
}

impl ToCss for FontWeight
{
	fn to_css<W: fmt::Write>(&self, dest: &mut W) -> fmt::Result
	{
		use self::FontWeight::*;;
		
		match *self
		{
			_100 => serialize_identifier("100", dest),
			_200 => serialize_identifier("200", dest),
			_300 => serialize_identifier("300", dest),
			_400 => serialize_identifier("400", dest),
			_500 => serialize_identifier("500", dest),
			_600 => serialize_identifier("600", dest),
			_700 => serialize_identifier("700", dest),
			_800 => serialize_identifier("800", dest),
			_900 => serialize_identifier("900", dest),
		}
	}
}

impl Parse for FontWeight
{
	fn parse<'i, 't>(_: &ParserContext, input: &mut Parser<'i, 't>) -> Result<FontWeight, ParseError<'i, CustomParseError<'i>>>
	{
		let result = input.try(|input|
		{
			let ident = input.expect_ident().map_err(|_| ())?;
			match_ignore_ascii_case!
			{
				&ident,
                "normal" => Ok(Self::normal),
                "bold" => Ok(Self::bold),
                _ => Err(())
            }
		});
		
		result.or_else(|_| Self::from_int(input.expect_integer()?).map_err(|()| ParseError::Custom(CustomParseError::FontFaceAtRuleFontWeightWasNotAValidIdentifierOrInteger)))
	}
}

impl FontWeight
{
	/// Convert from an integer to Weight
	/// As of CSS Fonts Module Level 3, only the following values are valid: 100, 200, 300, 400, 500, 600, 700, 800 and 900
	pub fn from_int(weight: i32) -> Result<Self, ()>
	{
		use self::FontWeight::*;
		
		match weight
		{
			100 => Ok(_100),
			200 => Ok(_200),
			300 => Ok(_300),
			400 => Ok(_400),
			500 => Ok(_500),
			600 => Ok(_600),
			700 => Ok(_700),
			800 => Ok(_800),
			900 => Ok(_900),
			_ => Err(()),
		}
	}
	
	pub fn isExactlyNormal(&self) -> bool
	{
		*self == FontWeight::_400
	}
	
	pub fn isExactlyBold(&self) -> bool
	{
		*self == FontWeight::_700
	}
	
	pub fn isBold(&self) -> bool
	{
		*self > FontWeight::_500
	}
	
	/// Return the bolder weight
	pub fn bolder(self) -> Self
	{
		use self::FontWeight::*;
		
		if self < _400
		{
			_400
		}
		else if self < _600
		{
			_700
		}
		else
		{
			_900
		}
	}
	
	/// Returns the lighter weight
	pub fn lighter(self) -> Self
	{
		use self::FontWeight::*;
		
		if self < _600
		{
			_100
		}
		else if self < _800
		{
			_400
		}
		else
		{
			_700
		}
	}
	
	pub const normal: FontWeight = FontWeight::_400;
	
	pub const bold: FontWeight = FontWeight::_700;
}