@uiw/codemirror-extensions-color/esm/utils.js

Color Extensions for CodeMirror6.

export function toFullHex(color) {
  if (color.length === 4) {
    // 3-char hex
    return ["#" + color[1].repeat(2) + color[2].repeat(2) + color[3].repeat(2), ''];
  }
  if (color.length === 5) {
    // 4-char hex (alpha)
    return ["#" + color[1].repeat(2) + color[2].repeat(2) + color[3].repeat(2), color[4].repeat(2)];
  }
  if (color.length === 9) {
    // 8-char hex (alpha)
    return ["#" + color.slice(1, -2), color.slice(-2)];
  }
  return [color, ''];
}
/** https://stackoverflow.com/a/5624139/1334703 */
export function rgbToHex(r, g, b) {
  return '#' + ((1 << 24) + (r << 16) + (g << 8) + b).toString(16).slice(1);
}

/** https://stackoverflow.com/a/5624139/1334703 */
export function hexToRgb(hex) {
  var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
  return result ? {
    r: parseInt(result[1], 16),
    g: parseInt(result[2], 16),
    b: parseInt(result[3], 16)
  } : null;
}

/** https://css-tricks.com/converting-color-spaces-in-javascript/#aa-rgb-to-hsl */
export function RGBToHSL(r, g, b) {
  r /= 255, g /= 255, b /= 255;
  var max = Math.max(r, g, b),
    min = Math.min(r, g, b);
  var h = 0,
    s,
    l = (max + min) / 2;
  if (max == min) {
    h = s = 0; // achromatic
  } else {
    var d = max - min;
    s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
    switch (max) {
      case r:
        h = (g - b) / d + (g < b ? 6 : 0);
        break;
      case g:
        h = (b - r) / d + 2;
        break;
      case b:
        h = (r - g) / d + 4;
        break;
    }
    h /= 6;
  }
  return {
    h: Math.floor(h * 360),
    s: Math.floor(s * 100),
    l: Math.floor(l * 100)
  };
}