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 source for a font-face rule.
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum Source
{
	/// A `url()` source.
	Url(FontUrlSource),
	
	/// A `local()` source.
	Local(FamilyName),
}

impl ToCss for Source
{
	fn to_css<W: fmt::Write>(&self, dest: &mut W) -> fmt::Result
	{
		use self::Source::*;
		
		match *self
		{
			Url(ref fontUrlSource) => fontUrlSource.to_css(dest),
			Local(ref familyName) => familyName.to_css(dest),
		}
	}
}

impl Separated for Source
{
	type Delimiter = Comma;
}

impl Parse for Source
{
	fn parse<'i, 't>(context: &ParserContext, input: &mut Parser<'i, 't>) -> Result<Source, ParseError<'i, CustomParseError<'i>>>
	{
		use self::Source::*;
		
		if input.try(|input| input.expect_function_matching("local")).is_ok()
		{
			input.parse_nested_block(|input|	 FamilyName::parse(context, input)).map(Local)
		}
		else
		{
			let url = SpecifiedUrl::parse(context, input)?;
			
			// Parsing optional format()
			let format_hints = if input.try(|input| input.expect_function_matching("format")).is_ok()
			{
				input.parse_nested_block(|input|
				{
					input.parse_comma_separated(|input|
					{
						Ok(input.expect_string()?.as_ref().to_owned())
					})
				})?
			}
			else
			{
				vec![]
			};
			
			Ok
			(
				Url
				(
					FontUrlSource
					{
						url,
						format_hints,
					}
				)
			)
		}
		
	}
}