function grammarTransformer(grammar)
    -- see : https://www.runoob.com/lua/lua-tables.html
    --print("c++ call lua function parse")
    mytable = {}

    --mytable["SPEECH_URL"] = "custom:ws://11.164.63.252:8101/ws/v1"
    --print("mytable 索引为 1 的元素是 ", mytable[1])
    --print("mytable 索引为 wow 的元素是 ", mytable["wow"])

    return mytable
end


function split(str, reps)
    local resultStrList = {}
    string.gsub(str, '[^'..reps..']+', function (w)
        table.insert(resultStrList, w)
    end)
    return resultStrList
end

function vendorParamsTransformer(vendorParams)
    -- vendorParams = k1=v1;k2=v2;k3=v3
    -- 将verndorParam按需拆分为key:value对，并可在此处进行相应修改
    --print("input : ", vendorParams)
    mytable = {}

    local list = split(vendorParams, ";")
    for _, s in ipairs(list) do
        print(s)
        local pos = string.find(s, '=')
        if pos then 
            local key = string.sub(s, 0, pos - 1)
            local value = string.sub(s, pos + 1)
            --print("key = ", key, ", value = ", value)
            mytable[key] = value
        end
    end

    --mytable["SPEECH_VOCAB_ID"] = "11111"
    return mytable
end