import { Subsets } from '../interface';

/** 从 CSS 文件中获取字体 subsets 类型的数据 */
export const getSubsetsFromCSS = (css: string): Subsets => {
    const list = css.match(/@font-face[\s\S]+?\}/g);
    if (!list) return [];
    return list.map((face) => {
        const unicodeList = face.match(/unicode-range:([\s\S]*(?:[,;]))+/);
        if (!unicodeList) return [];
        const range = unicodeList[1];
        return range
            .split(/[,;]/)
            .map((i) => i.trim())
            .filter(Boolean)
            .map((i) => {
                i = i.replace('U+', '');
                if (i.includes('-')) {
                    return i.split('-').map((i) => parseInt('0x' + i)) as [
                        number,
                        number,
                    ];
                } else {
                    return parseInt('0x' + i);
                }
            });
    });
};