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.


#[derive(Debug, Clone, Ord, PartialOrd, Eq, PartialEq, Hash)]
pub enum FontFamily
{
	FamilyName(FamilyName),
	Generic(GenericFontFamilyName),
}

impl ToCss for FontFamily
{
	fn to_css<W: fmt::Write>(&self, dest: &mut W) -> fmt::Result
	{
		use self::FontFamily::*;
		
		match *self
		{
			FamilyName(ref name) => name.to_css(dest),
			
			Generic(ref name) => name.to_css(dest),
		}
	}
}

impl FontFamily
{
	/// Parse a font-family value
	pub(crate) fn parse<'i, 't>(input: &mut Parser<'i, 't>) -> Result<Self, ParseError<'i, CustomParseError<'i>>>
	{
		use self::FontFamily::Generic;
		use self::FamilyNameSyntax::*;
		use self::GenericFontFamilyName::*;
		
		if let Ok(value) = input.try(|i| i.expect_string_cloned())
		{
			return Ok
			(
				FontFamily::FamilyName
				(
					FamilyName
					{
						name: Atom::from(&*value),
						syntax: Quoted,
					}
				)
			)
		}
		
		let first_ident = input.expect_ident()?.clone();
		
		// From https://drafts.csswg.org/css-fonts/#propdef-font-family:-
		// Font family names that happen to be the same as a keyword value (`inherit`, `serif`, `sans-serif`, `monospace`, `fantasy`, and `cursive`) must be quoted to prevent confusion with the keywords with the same names.
		// The keywords ‘initial’ and ‘default’ are reserved for future use and must also be quoted when used as font names.
		// UAs must not consider these keywords as matching the <family-name> type."
		let is_css_wide_keyword =
		{
			match_ignore_ascii_case!
			{
				&first_ident,
				
				"serif" => return Ok(Generic(serif)),
				"sans-serif" => return Ok(Generic(sans_serif)),
				"cursive" => return Ok(Generic(cursive)),
				"fantasy" => return Ok(Generic(fantasy)),
				"monospace" => return Ok(Generic(monospace)),
	
				"inherit" | "initial" | "unset" | "default" => true,
				
				_ => false,
			}
		};
		
		let mut value = first_ident.as_ref().to_owned();
		let mut serialization = String::new();
		serialize_identifier(&first_ident, &mut serialization).unwrap();
		
		// These keywords are not allowed by themselves.
		// The only way this value can be valid is with another keyword.
		if is_css_wide_keyword
		{
			let ident = input.expect_ident()?;
			value.push(' ');
			value.push_str(&ident);
			serialization.push(' ');
			serialize_identifier(&ident, &mut serialization).unwrap();
		}
		
		while let Ok(ident) = input.try(|i| i.expect_ident_cloned())
		{
			value.push(' ');
			value.push_str(&ident);
			serialization.push(' ');
			serialize_identifier(&ident, &mut serialization).unwrap();
		}
		
		Ok
		(
			FontFamily::FamilyName
			(
				FamilyName
				{
					name: Atom::from(value),
					syntax: Identifiers(serialization),
				}
			)
		)
	}
}