Lua Print table (PHP-like Print_r/var_export)

PHP people know php print_r/var_export function, can be conveniently used to print arrays or export variables, LUA does not provide, in practical applications is often required similar functions.

Today, we encapsulate a simple function that implements a similar function for printing/exporting table:

--Dump.lua--[[dump Object @param mixed Obj@return string]]function debug.dump (obj)     local getindent, Quotestr, Wrapkey, wrapval, dumpobj    getindent = function (level)          return String.rep ("\ T", level)     end    quotestr = function (str)          str = string.gsub (str, "[%c\\\"] ", {             ["\ t"] = "\\t",            ["\ r"] = "\\r",            ["\ n"] = "\\n",             ["\"] = "\\\" ",             ["\ \"] = "\\\\",       })          return ' "'. Str.. ' '     end    wrapkey = function (val)         if Type (val) = = "Number" then             return "[".. Val.. "]"         ElseIf type (val) = = "string" then             return "[".. Quotestr (val): "]"         else             Return "[".. ToString (val): "]"         end    end    wrapval = function (val, Level)         if Type (val) = = "Table" then             return DumpObj (Val, level)         ElseIf type (val ) = = "Number" then            return val         ElseIf Type (val) = = "string" Then            return Quotestr (val)          else            return ToString (val)         end    end    dumpobj = function (obj, level )         if Type (obj) ~= "table" then             return Wrapval (obj)         end         level = level + 1        Local tokens = {}         tokens[#tokens + 1] = "{"         for-K, V in pairs (obj ) do            tokens[#tokens + 1] = GetIndent (level): Wrapkey (k).. " = " .. Wrapval (V, level): ","         End        tokens[#tokens + 1] = GetIndent (LEVEL-1): "}"         return Table.concat (tokens, "\ n")     end     Return dumpobj (obj, 0) end

Test code:

--Test.lualocal obj = {string1 = "hi! My name is Lixianlin ", string2 =" aa\tbb\rcc\ndd\\ee\ "ff", string3 = "a\\tb\\rc\\n\\\\ee\" ff ", int = 9527, flo at = 3.1415, bool = true, table = {1, 2, 3, {a = +, B = $, c = 23 ,},}, [88888] =, [9.7] = 22222,}print (debug.dump (obj)

Output Result:

{        ["string1"] = "hi! My name is Lixianlin ",        [9.7] = 22222,         ["table"] = {                [1] = 1,                [2] = 2,                 [3] = 3,                 [4] = {                         [" B "] = 22,                         ["a"] = 21,                         ["c"] = 23,                },       },         ["float"] = 3.1415,        ["int"] = 9527,         ["string3"] = "a\\tb\\rc\\n\\\\ee\" ff ",        [" bool "] = True,         ["string2"] = "aa\tbb\rcc\ndd\\ee\" FF ",         [88] = 88888,}

Function Features:

1. Theoretically supports infinite table nesting

2, formatted output, good readability

3. Output can be directly used in LUA code

4, function, UserData, thread type tostring output

5. When there are control characters in the string, there may be an impact (the code only handles \t,\r,\n, etc.)

Lua Print table (PHP-like Print_r/var_export)