css-minify 0.5.2

CSS parser and minificator based on nom
Documentation 
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use crate::parsers::utils::{between, is_not_block_ending, non_useless, space};
use crate::structure::{Name, Parameters, Value};
use indexmap::map::IndexMap;
use nom::branch::alt;
use nom::bytes::complete::is_not;
use nom::character::complete::char;
use nom::combinator::{map, peek, recognize};
use nom::multi::{many0, many1};
use nom::sequence::{separated_pair, terminated};
use nom::IResult;

pub fn parse_parameters(input: &str) -> IResult<&str, Parameters> {
    map(
        many0(non_useless(is_not_block_ending(parse_parameter))),
        |p| p.into_iter().collect::<IndexMap<_, _>>().into(),
    )(input)
}

pub fn parse_parameter(input: &str) -> IResult<&str, (Name, Value)> {
    map(
        terminated(
            separated_pair(parse_key, char(':'), parse_value),
            alt((char(';'), peek(char('}')))),
        ),
        |(name, value)| (name.trim().into(), value.trim().into()),
    )(input)
}

fn parse_key(input: &str) -> IResult<&str, &str> {
    non_useless(is_not(":;}"))(input)
}

fn parse_value(input: &str) -> IResult<&str, &str> {
    non_useless(recognize(many1(alt((
        between("\"", "\""),
        between("'", "'"),
        between("(", ")"),
        space,
        is_not("\"'();}"),
    )))))(input)
}

#[cfg(test)]
mod test {
    use crate::parsers::parameters::{parse_parameter, parse_parameters};
    use indexmap::map::IndexMap;
    use nom::combinator::all_consuming;

    #[test]
    fn test_parameter() {
        assert_eq!(
            parse_parameter("margin-top: 32px;"),
            Ok(("", ("margin-top".into(), "32px".into())))
        )
    }

    #[test]
    fn test_parameters() {
        assert_eq!(
            parse_parameters(
                "
                margin-top: 32px;
                margin-bottom: 32px;
                margin-left: 32px; /* lazyefix */

                float: left; /* lazyefix */
                "
            ),
            Ok(("", {
                let mut tmp = IndexMap::new();
                tmp.insert("margin-top".into(), "32px".into());
                tmp.insert("margin-bottom".into(), "32px".into());
                tmp.insert("margin-left".into(), "32px".into());
                tmp.insert("float".into(), "left".into());
                tmp.into()
            }))
        )
    }

    #[test]
    fn test_parameters_important() {
        assert_eq!(
            parse_parameters(
                "
                background-color: #f64e60 !important; 
                "
            ),
            Ok(("", {
                let mut tmp = IndexMap::new();
                tmp.insert("background-color".into(), "#f64e60 !important".into());
                tmp.into()
            }))
        )
    }

    #[test]
    fn test_parameters_double_dot() {
        assert_eq!(
            all_consuming(parse_parameters)(
                "
                display: inline-block;;
                font-size: 16px;
                "
            )
            .is_err(),
            true
        )
    }

    #[test]
    fn test_parameters_content() {
        assert_eq!(
            all_consuming(parse_parameters)(
                "
                content: \";\";
                "
            ),
            Ok(("", {
                let mut tmp = IndexMap::new();
                tmp.insert("content".into(), "\";\"".into());
                tmp.into()
            }))
        )
    }

    #[test]
    fn test_parameters_url() {
        assert_eq!(
            all_consuming(parse_parameters)(
                "
                background: url(';');
                "
            ),
            Ok(("", {
                let mut tmp = IndexMap::new();
                tmp.insert("background".into(), "url(';')".into());
                tmp.into()
            }))
        )
    }
}