@taiga-ui/cdk/esm2022/utils/color/rgba-to-hex.mjs

Base library for creating Angular components and applications using Taiga UI principles regarding of actual visual appearance

export function tuiRgbaToHex(color) {
    if (!tuiIsValidRgba(color)) {
        throw new Error('Invalid RGBa');
    }
    const rgb = /^rgba?\((\d+),(\d+),(\d+),?([^,\s)]+)?/i.exec(color.replaceAll(/\s/g, '')) ??
        null;
    let alpha = ((rgb?.[4] ?? '')).trim();
    let hex = rgb
        ? ((parseInt(rgb?.[1] ?? '', 10) || 0) | (1 << 8)).toString(16).slice(1) +
            ((parseInt(rgb?.[2] ?? '', 10) || 0) | (1 << 8)).toString(16).slice(1) +
            ((parseInt(rgb?.[3] ?? '', 10) || 0) | (1 << 8)).toString(16).slice(1)
        : color;
    alpha = alpha !== '' ? alpha : 0o1;
    alpha = ((Number(alpha) * 255) | (1 << 8)).toString(16).slice(1);
    hex += alpha;
    return `#${hex.toUpperCase()}`;
}
export function tuiIsValidRgba(rgba) {
    const range = String.raw `(\d|[1-9]\d|1\d{2}|2[0-4]\d|2[0-5]{2})`;
    const alpha = String.raw `([01]|0?\.\d+)`;
    return new RegExp(`^(?:rgb\\(\\s*${range}\\s*,\\s*${range}\\s*,\\s*${range}\\s*\\)|rgba\\(\\s*${range}\\s*,\\s*${range}\\s*,\\s*${range}\\s*,\\s*${alpha}\\s*\\))$`).test(rgba);
}
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