使用lua实现php的print_r()函数功能_Lua

使用lua实现php的print_r()函数功能

之前写了一些类似php的函数，下面再来一个print_r()函数，代码如下：

function pr (t, name, indent)   

    local tablelist = {}   

    function table_r (t, name, indent, full)   

        local id = not full and name or type(name)~="number" and tostring(name) or '['..name..']'   

        local tag = indent .. id .. ' = '   

        local out = {}  -- result   

        if type(t) == "table" then   

            if tablelist[t] ~= nil then   

                table.insert(out, tag .. '{} -- ' .. tablelist[t] .. ' (self reference)')   

            else  

                tablelist[t]= full and (full .. '.' .. id) or id  

                if next(t) then -- table not empty   

                    table.insert(out, tag .. '{')   

                    for key,value in pairs(t) do   

                        table.insert(out,table_r(value,key,indent .. '|  ',tablelist[t]))   

                    end   

                    table.insert(out,indent .. '}')   

                else table.insert(out,tag .. '{}') end   

            end   

        else  

            local val = type(t)~="number" and type(t)~="boolean" and '"'..tostring(t)..'"' or tostring(t)   

            table.insert(out, tag .. val)   

        end   

        return table.concat(out, '\n')   

    end   

    return table_r(t,name or 'value',indent or '')   

end   

function print_r (t, name)   

    print(pr(t,name))   

end   

local a = {x=1, y=2, label={text='hans', color='blue'}, list={'a','b','c'}}   

print_r(a)