lewp-css 0.2.0

Domain model for CSS Stylesheets. Allowing effective minification and transformations such as autoprefixing and removal by other crates. Updated and maintained version for lewp.
Documentation 
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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.

use {
    crate::CustomParseError,
    cssparser::{ParseError, Parser},
};

#[derive(Debug, Clone, Ord, PartialOrd, Eq, PartialEq, Hash)]
pub struct FontFeatureSetting(pub String, pub u32);

impl FontFeatureSetting {
    pub(crate) fn parse<'i, 't>(
        input: &mut Parser<'i, 't>,
    ) -> Result<Self, ParseError<'i, CustomParseError<'i>>> {
        let openTypeFeatureTag = {
            let openTypeFeatureTag = input.expect_string()?;
            if openTypeFeatureTag.len() != 4 {
                return Err(ParseError::from(
                    CustomParseError::FontFeatureSettingOpenTypeFeatureTagMustBeFourCharacters(
                        openTypeFeatureTag.clone(),
                    ),
                ));
            }

            for character in openTypeFeatureTag.chars() {
                if character <= '\x20' || character > '\x7E' {
                    return Err(ParseError::from(
                        CustomParseError::FontFeatureSettingOpenTypeFeatureTagMustBePrintableAscii(
                            openTypeFeatureTag.clone(),
                        ),
                    ));
                }
            }

            openTypeFeatureTag.as_ref().into()
        };

        if let Ok(integer) = input.r#try(|input| input.expect_integer()) {
            if integer < 0 {
                Err(ParseError::from(
                    CustomParseError::FontFeatureSettingIntegerMustBePositive(
                        integer,
                    ),
                ))
            } else {
                Ok(FontFeatureSetting(openTypeFeatureTag, integer as u32))
            }
        } else {
            let ident = input.expect_ident()?;

            match_ignore_ascii_case! {
                ident,

                "on" => Ok(FontFeatureSetting(openTypeFeatureTag, 1)),

                "off" => Ok(FontFeatureSetting(openTypeFeatureTag, 0)),

                _ => Err(ParseError::from(CustomParseError::FontFeatureSettingIfNotAnIntegerMustBeOnOrOff(ident.clone())))
            }
        }
    }
}