wix-style-react/src/Foundation/stylable/mixins/rgba_to_hex8.js

wix-style-react

module.exports = function rgba_to_hex8(orig) {
  let a;
  const rgb = orig
    .replace(/\s/g, '')
    .match(/^rgba?\((\d+),(\d+),(\d+),?([^,\s)]+)?/i);
  const alpha = ((rgb && rgb[4]) || '').trim();
  let hex = rgb
    ? (rgb[1] | (1 << 8)).toString(16).slice(1) +
      (rgb[2] | (1 << 8)).toString(16).slice(1) +
      (rgb[3] | (1 << 8)).toString(16).slice(1)
    : orig;

  if (alpha !== '') {
    a = alpha;
  } else {
    a = 'FF';
  }
  // multiply before convert to HEX
  a = ((a * 255) | (1 << 8)).toString(16).slice(1);
  hex = hex + a;

  return '#' + hex.toUpperCase();
};