libs-js/src/emoji.js

零散的工具函数，无依赖

export const utf16_to_entities = (str) => {
    var patt = /[\ud800-\udbff][\udc00-\udfff]/g; // 检测utf16字符正则
    str = str.replace(patt, function(char) {
        var H, L, code;
        if (char.length === 2) {
            H = char.charCodeAt(0); // 取出高位
            L = char.charCodeAt(1); // 取出低位
            code = (H - 0xD800) * 0x400 + 0x10000 + L - 0xDC00; // 转换算法
            return "&#" + code + ";";
        } else {
            return char;
        }
    });
    return str;
}


export const is_emoji_character = (op) => {
    let substring = op;
    for (let i = 0; i < substring.length; i++) {
        let hs = substring.charCodeAt(i);
        if (0xd800 <= hs && hs <= 0xdbff) {
            if (substring.length > 1) {
                let ls = substring.charCodeAt(i + 1);
                let uc = ((hs - 0xd800) * 0x400) + (ls - 0xdc00) + 0x10000;
                if (0x1d000 <= uc && uc <= 0x1f77f) {
                    return true;
                }
            }
        } else if (substring.length > 1) {
            let ls = substring.charCodeAt(i + 1);
            if (ls == 0x20e3) {
                return true;
            }
        } else {
            if (0x2100 <= hs && hs <= 0x27ff) {
                return true;
            } else if (0x2B05 <= hs && hs <= 0x2b07) {
                return true;
            } else if (0x2934 <= hs && hs <= 0x2935) {
                return true;
            } else if (0x3297 <= hs && hs <= 0x3299) {
                return true;
            } else if (hs == 0xa9 || hs == 0xae || hs == 0x303d || hs == 0x3030 || hs == 0x2b55 || hs == 0x2b1c || hs == 0x2b1b || hs == 0x2b50) {
                return true;
            }
        }
    }
    return false;
};