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.


/// https://drafts.csswg.org/css-counter-styles/#counter-style-range
///
/// Empty Vec represents 'auto'
#[derive(Clone, Debug)]
pub struct Ranges(pub Vec<::std::ops::Range<Option<i32>>>);

impl Parse for Ranges
{
	fn parse<'i, 't>(_context: &ParserContext, input: &mut Parser<'i, 't>) -> Result<Self, ParseError<'i, CustomParseError<'i>>>
	{
		if input.try(|input| input.expect_ident_matching("auto")).is_ok()
		{
			Ok(Self::empty())
		}
		else
		{
			input.parse_comma_separated(|input|
			{
				let opt_start = Self::parse_bound(input)?;
				let opt_end = Self::parse_bound(input)?;
				if let (Some(start), Some(end)) = (opt_start, opt_end)
				{
					if start > end
					{
						return Err(ParseError::Custom(CustomParseError::CounterStyleRangesCanNotHaveStartGreaterThanEnd(start, end)))
					}
				}
				Ok(opt_start .. opt_end)
			}).map(Ranges)
		}
	}
}

impl ToCss for Ranges
{
	fn to_css<W: fmt::Write>(&self, dest: &mut W) -> fmt::Result
	{
		let mut iter = self.0.iter();
		if let Some(first) = iter.next()
		{
			Self::range_to_css(first, dest)?;
			for item in iter
			{
				dest.write_str(",")?;
				Self::range_to_css(item, dest)?;
			}
			Ok(())
		}
		else
		{
			dest.write_str("auto")
		}
	}
}

impl Ranges
{
	#[inline(always)]
	pub fn empty() -> Self
	{
		Ranges(Vec::new())
	}
	
	#[inline(always)]
	pub fn is_auto(&self) -> bool
	{
		self.0.is_empty()
	}
	
	fn parse_bound<'i, 't>(input: &mut Parser<'i, 't>) -> Result<Option<i32>, ParseError<'i, CustomParseError<'i>>>
	{
		use self::Token::*;
		
		match input.next()
		{
			Ok(&Number { int_value: Some(v), .. }) => Ok(Some(v)),
			
			Ok(&Ident(ref ident)) if ident.eq_ignore_ascii_case("infinite") => Ok(None),
			
			Ok(token) => Err(BasicParseError::UnexpectedToken(token.clone()).into()),
			
			Err(error) => Err(error.into()),
		}
	}
	
	fn range_to_css<W: fmt::Write>(range: &::std::ops::Range<Option<i32>>, dest: &mut W) -> fmt::Result
	{
		Self::bound_to_css(range.start, dest)?;
		dest.write_char(' ')?;
		Self::bound_to_css(range.end, dest)
	}
	
	fn bound_to_css<W: fmt::Write>(range: Option<i32>, dest: &mut W) -> fmt::Result
	{
		if let Some(finite) = range
		{
			finite.to_css(dest)
		}
		else
		{
			dest.write_str("infinite")
		}
	}
}