Grcov report - unit

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//! Type for values in the [0.0, 1.0] range.

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use cssparser::Parser;

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use crate::error::*;

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use crate::length::*;

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use crate::parsers::Parse;

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use crate::util;

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29929783

#[derive(Debug, Default, Copy, Clone, PartialEq, PartialOrd)]

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pub struct UnitInterval(pub f64);

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impl UnitInterval {

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    pub fn clamp(val: f64) -> UnitInterval {

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        UnitInterval(util::clamp(val, 0.0, 1.0))

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impl Parse for UnitInterval {

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    fn parse<'i>(parser: &mut Parser<'i, '_>) -> Result<UnitInterval, ParseError<'i>> {

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        let loc = parser.current_source_location();

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        let l: Length<Both> = Parse::parse(parser)?;

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        match l.unit {

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            LengthUnit::Px | LengthUnit::Percent => Ok(UnitInterval::clamp(l.length)),

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            _ => Err(loc.new_custom_error(ValueErrorKind::value_error(

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                "<unit-interval> must be in default or percent units",

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            ))),

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impl From<UnitInterval> for u8 {

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    fn from(val: UnitInterval) -> u8 {

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        let UnitInterval(x) = val;

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        (x * 255.0 + 0.5).floor() as u8

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#[cfg(test)]

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mod tests {

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    use super::*;

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    #[test]

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    fn clamps() {

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        assert_eq!(UnitInterval::clamp(-1.0), UnitInterval(0.0));

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        assert_eq!(UnitInterval::clamp(0.0), UnitInterval(0.0));

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        assert_eq!(UnitInterval::clamp(0.5), UnitInterval(0.5));

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        assert_eq!(UnitInterval::clamp(1.0), UnitInterval(1.0));

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        assert_eq!(UnitInterval::clamp(2.0), UnitInterval(1.0));

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    #[test]

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    fn parses_percentages() {

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        assert_eq!(UnitInterval::parse_str("-100%").unwrap(), UnitInterval(0.0));

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        assert_eq!(UnitInterval::parse_str("0%").unwrap(), UnitInterval(0.0));

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        assert_eq!(UnitInterval::parse_str("50%").unwrap(), UnitInterval(0.5));

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        assert_eq!(UnitInterval::parse_str("100%").unwrap(), UnitInterval(1.0));

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        assert_eq!(

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            UnitInterval::parse_str("100.1%").unwrap(),

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            UnitInterval(1.0)

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);

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        assert_eq!(UnitInterval::parse_str("200%").unwrap(), UnitInterval(1.0));

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    #[test]

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    fn parses_number() {

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        assert_eq!(UnitInterval::parse_str("0").unwrap(), UnitInterval(0.0));

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        assert_eq!(UnitInterval::parse_str("1").unwrap(), UnitInterval(1.0));

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        assert_eq!(UnitInterval::parse_str("0.5").unwrap(), UnitInterval(0.5));

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    #[test]

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    fn parses_out_of_range_number() {

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        assert_eq!(UnitInterval::parse_str("-10").unwrap(), UnitInterval(0.0));

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        assert_eq!(UnitInterval::parse_str("10").unwrap(), UnitInterval(1.0));

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    #[test]

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    fn errors_on_invalid_input() {

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        assert!(UnitInterval::parse_str("").is_err());

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        assert!(UnitInterval::parse_str("foo").is_err());

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        assert!(UnitInterval::parse_str("-x").is_err());

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        assert!(UnitInterval::parse_str("0.0foo").is_err());

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        assert!(UnitInterval::parse_str("0.0%%").is_err());

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        assert!(UnitInterval::parse_str("%").is_err());

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    #[test]

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    fn convert() {

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        assert_eq!(u8::from(UnitInterval(0.0)), 0);

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        assert_eq!(u8::from(UnitInterval(0.5)), 128);

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        assert_eq!(u8::from(UnitInterval(1.0)), 255);

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