计算字符是否为中文 简单判断

Posted 2023-01-30 heyuchang666

---计算字符是否为中文
---@param inputstr string
function StringUtil.isChineseCharacter(inputstr)
    -- 可以计算出字符宽度，用于显示使用
    local isChineseCharacter = true

    local lenInByte = #inputstr
    local i = 1
    while (i <= lenInByte)
    do
        local curByte = string.byte(inputstr, i)
        -- Logger.filter("StringUtil",i, lenInByte, curByte)
        local byteCount = 1;
        -- print("isChineseCharacter", i, curByte)
        if curByte > 0 and curByte <= 127 then
            isChineseCharacter = false
            byteCount = 1                                           --1字节字符
            break
        elseif curByte >= 192 and curByte <= 223 then
            byteCount = 2                                           --双字节字符
        elseif curByte >= 228 and curByte <= 233 then
            byteCount = 3                                           --汉字
        elseif curByte >= 240 and curByte <= 247 then
            byteCount = 4                                          --4字节字符
        else
            isChineseCharacter = false
            break
        end

        i = i + byteCount                                 -- 重置下一字节的索引
    end
    return isChineseCharacter
end