colorparser-css 0.0.1

CSS color parser library
Documentation 
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use crate::{Hsla, Solid};

fn hue_to_rgb(n1: f32, n2: f32, h: f32) -> f32 {
    let h = modulo(h, 6.0);

    if h < 1.0 {
        return n1 + ((n2 - n1) * h);
    }

    if h < 3.0 {
        return n2;
    }

    if h < 4.0 {
        return n1 + ((n2 - n1) * (4.0 - h));
    }

    n1
}

// h = 0..360
// s, l = 0..1
// r, g, b = 0..1
pub fn hsl_to_rgb(h: f32, s: f32, l: f32) -> (f32, f32, f32) {
    if s == 0.0 {
        return (l, l, l);
    }

    let n2 = if l < 0.5 {
        l * (1.0 + s)
    } else {
        l + s - (l * s)
    };

    let n1 = 2.0 * l - n2;
    let h = h / 60.0;
    let r = hue_to_rgb(n1, n2, h + 2.0);
    let g = hue_to_rgb(n1, n2, h);
    let b = hue_to_rgb(n1, n2, h - 2.0);
    (r, g, b)
}

fn _get_min(rgb: &[f32]) -> f32 {
    rgb.iter().fold(f32::MAX, |a, &b| a.min(b))
}

fn _get_max(rgb: &[f32]) -> f32 {
    rgb.iter().fold(f32::MIN, |a, &b| a.max(b))
}

pub fn _rgb_to_hsl_other(r: f32, g: f32, b: f32) -> (f32, f32, f32) {
    let rgb_arr: Vec<f32> = [r, g, b].iter().map(|p| p / 255.0).collect();
    let max = _get_max(&rgb_arr);
    let min = _get_min(&rgb_arr);
    let luminace = (max + min) / 2.0;

    if max.eq(&min) {
        return (0.0, 0.0, luminace * 100.0);
    }

    let max_min_delta = max - min;
    let saturation = if luminace > 0.5 {
        max_min_delta / (2.0 - max - min)
    } else {
        max_min_delta / (max + min)
    };

    let red = rgb_arr[0];
    let green = rgb_arr[1];
    let blue = rgb_arr[2];

    let hue = if red.eq(&max) {
        let x = if g < b { 6.0 } else { 0.0 };
        (green - blue) / max_min_delta + x
    } else if green.eq(&max) {
        (blue - red) / max_min_delta + 2.0
    } else {
        (red - green) / max_min_delta + 4.0
    };

    (hue * 60.0, saturation, luminace)
}

#[allow(clippy::float_cmp)]
pub fn rgb_to_hsl(r: f32, g: f32, b: f32) -> (f32, f32, f32) {
    let min = r.min(g.min(b));
    let max = r.max(g.max(b));
    let l = (max + min) / 2.0;

    if min == max {
        return (0.0, 0.0, l);
    }

    let d = max - min;

    let s = if l < 0.5 {
        d / (max + min)
    } else {
        d / (2.0 - max - min)
    };

    let dr = (max - r) / d;
    let dg = (max - g) / d;
    let db = (max - b) / d;

    let h = if r == max {
        db - dg
    } else if g == max {
        2.0 + dr - db
    } else {
        4.0 + dg - dr
    };

    let h = (h * 60.0) % 360.0;
    (normalize_angle(h), s, l)
}

#[inline]
pub fn normalize_angle(t: f32) -> f32 {
    let mut t = t % 360.0;
    if t < 0.0 {
        t += 360.0;
    }
    t
}

#[inline]
pub fn clamp0_1(t: f32) -> f32 {
    t.clamp(0.0, 1.0)
}

#[inline]
pub fn modulo(x: f32, n: f32) -> f32 {
    (x % n + n) % n
}

pub fn strip_string(input: String, prefixes: &[&str], suffix: char) -> String {
    let mut result = input;

    // Remove matching prefix (if any)
    for &prefix in prefixes {
        if let Some(stripped) = result.strip_prefix(prefix) {
            result = stripped.to_string();
            break; // Only remove the first matching prefix
        }
    }

    // Remove suffix (if it exists)
    result.strip_suffix(suffix).unwrap_or(&result).to_string()
}

pub fn darken(color: Hsla, percentage: f32) -> Solid {
    let mut hsla = color;
    hsla.l -= percentage;
    Solid::from_hsla(hsla.h, hsla.s, hsla.l, hsla.a)
}

pub fn lighten(color: Hsla, percentage: f32) -> Solid {
    let mut hsla = color;
    hsla.l += percentage;
    Solid::from_hsla(hsla.h, hsla.s, hsla.l, hsla.a)
}