lua打印表格

function print_table(t)
    local cache = {}
    local function print_table_sub (t, indent)
        if (cache[tostring(t)]) then
            print(indent  ..  "*"  ..  tostring(t))
        else
            cache[tostring(t)] = true
            if (type(t) == "table") then
                for pos, val in pairs(t) do
                    if (type(val) == "table") then
                        print(indent  ..  "["  ..  pos  ..  "] => "  ..  tostring(t)  ..  " {")
                        print_table_sub (val, indent  ..  string.rep(" ", string.len(pos) + 8))
                        print(indent  ..  string.rep(" ", string.len(pos) + 6)  ..  "}")
                    elseif (type(val) == "string") then
                        print(indent  ..  "["  ..  pos  ..  '] => "'  ..  val  ..  '"')
                    else
                        print(indent  ..  "["  ..  pos  ..  "] => "  ..  tostring(val))
                    end
                end
            else
                print(indent  ..  tostring(t))
            end
        end
    end
    if (type(t) == "table") then
        print(tostring(t)  ..  " {")
        print_table_sub (t, "  ")
        print("}")
    else
        print_table_sub (t, "  ")
    end
    print()
end