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, Clone)]
pub struct FontFeatureSettings(pub BTreeMap<String, u32>);

impl ToCss for FontFeatureSettings
{
	fn to_css<W: fmt::Write>(&self, dest: &mut W) -> fmt::Result
	{
		if self.0.is_empty()
		{
			serialize_identifier("normal", dest)
		}
		else
		{
			for (openTypeFeatureTag, integer) in self.0.iter()
			{
				serialize_string(openTypeFeatureTag, dest)?;
				let integer = *integer;
				if integer != 1
				{
					dest.write_str(" ")?;
					integer.to_css(dest)?;
				}
			}
			Ok(())
		}
	}
}

impl Parse for FontFeatureSettings
{
	fn parse<'i, 't>(_: &ParserContext, input: &mut Parser<'i, 't>) -> Result<Self, ParseError<'i, CustomParseError<'i>>>
	{
		if input.try(|input| input.expect_ident_matching("normal")).is_ok()
		{
			Ok(FontFeatureSettings(BTreeMap::new()))
		}
		else
		{
			let mut settings = BTreeMap::new();
			for setting in input.parse_comma_separated(|input| FontFeatureSetting::parse(input))?
			{
				settings.insert(setting.0, setting.1);
			}
			Ok(FontFeatureSettings(settings))
		}
	}
}

impl FontFeatureSettings
{
	#[inline(always)]
	pub fn setting(&self, openTypeFeatureTag: &str) -> Option<u32>
	{
		self.0.get(openTypeFeatureTag).map(|reference| *reference)
	}
	
	#[inline(always)]
	pub fn isOn(&self, openTypeFeatureTag: &str) -> Option<bool>
	{
		self.0.get(openTypeFeatureTag).map(|integer| *integer == 1)
	}
	
	#[inline(always)]
	pub fn isOff(&self, openTypeFeatureTag: &str) -> Option<bool>
	{
		self.0.get(openTypeFeatureTag).map(|integer| *integer == 0)
	}
	
	#[inline(always)]
	pub fn isNormal(&self) -> bool
	{
		self.0.is_empty()
	}
	
	#[inline(always)]
	pub fn normal() -> Self
	{
		FontFeatureSettings(Default::default())
	}
}