一个json字符串，decode成table,之后再把这个table encode成json，俩个json不一样！ #19

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1. utmhikari commented on Jul 29, 2019

   

   utmhikari

   on Jul 29, 2019

   Last edited by utmhikari

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   目测是源码encode_table的next测到nil直接判定为array了
   可以小魔改一下，比如：

    local t_type = 'array'
    local n = 0
    local max = -1
    for k in pairs(val) do
       if type(k) == "string" then
         t_type = 'object'
         break
       elseif type(k) == "number" then
         n = n + 1
         max = math.max(max, k)
       else
         error("invalid table: mixed or invalid key types")
       end
     end
   if t_type == 'array' then
       if n == 0 then
         t_type = 'object'
       elseif n ~= #val then
         t_type = 'sparse_array'
       end
     end

   来区分array、稀疏array跟object
2. Trumeet commented on Oct 5, 2019

   

   Trumeet

   on Oct 5, 2019

   More actions

   English please.

   👍React with 👍4Reacted by nasikusa, flyer, notify and Andy Lu

   👎React with 👎3Reacted by Seppi, nil and VictoryWangCN

   👀React with 👀1Reacted by Guy Sviry
3. fnaith commented on Jun 1, 2020

   

   fnaith

   on Jun 1, 2020

   More actions

   (Just translating)

   local json_before = {"key":[{},{},{},{},{},{},{},{},{},{}],"roleAttr":{"3":0,"4":0,"5":0,"6":0,"7":0,"8":0,"9":0,"0":0,"1":0,"2":0}}
   local list = json.decode(json_before );
   local json_after = json.encode(list);
   此时的json_afre为：{"key":[[],[],[],[],[],[],[],[],[],[]],"roleAttr":{"1":0,"0":0,"3":0,"2":0,"5":0,"4":0,"7":0,"6":0,"9":0,"8":0}}

   为何不一样？

   local json_before = {"key":[{},{},{},{},{},{},{},{},{},{}],"roleAttr":{"3":0,"4":0,"5":0,"6":0,"7":0,"8":0,"9":0,"0":0,"1":0,"2":0}}
   local list = json.decode(json_before );
   local json_after = json.encode(list);
   In this moment json_after is : {"key":[[],[],[],[],[],[],[],[],[],[]],"roleAttr":{"1":0,"0":0,"3":0,"2":0,"5":0,"4":0,"7":0,"6":0,"9":0,"8":0}}

   Why are json_before and json_after different?

   目测是源码encode_table的next测到nil直接判定为array了
   可以小魔改一下，比如：

    local t_type = 'array'
    local n = 0
    local max = -1
    for k in pairs(val) do
       if type(k) == "string" then
         t_type = 'object'
         break
       elseif type(k) == "number" then
         n = n + 1
         max = math.max(max, k)
       else
         error("invalid table: mixed or invalid key types")
       end
     end
   if t_type == 'array' then
       if n == 0 then
         t_type = 'object'
       elseif n ~= #val then
         t_type = 'sparse_array'
       end
     end

   来区分array、稀疏array跟object

   It seems like the encode_table treat input table as array when it found nil by next.
   Could modify code like...

    local t_type = 'array'
    local n = 0
    local max = -1
    for k in pairs(val) do
       if type(k) == "string" then
         t_type = 'object'
         break
       elseif type(k) == "number" then
         n = n + 1
         max = math.max(max, k)
       else
         error("invalid table: mixed or invalid key types")
       end
     end
   if t_type == 'array' then
       if n == 0 then
         t_type = 'object'
       elseif n ~= #val then
         t_type = 'sparse_array'
       end
     end
   

   ...to distinguish between array, sparse array and table.
4. alexandro-rezakhani

   added a commit that references this issue on Nov 20, 2022

   Improved table encoding code to handle sparse arrays. Floating point …

   ...

   ad6ac0f
5. ruyi789 commented on Nov 22, 2022

   

   ruyi789

   on Nov 22, 2022

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   local __json_object = {__json_object =  function() end}
   function json.newObject()
     return setmetatable({}, __json_object)
   end
   

   parse_object

   local function parse_object(str, i)
     local res = json.newObject()
   

   encode_table

     local t = getmetatable(val)
     if (t == nil or t.__json_object == nil) and (rawget(val, 1) ~= nil or next(val) == nil) then
   
6. alexandro-rezakhani commented on Nov 22, 2022

   

   alexandro-rezakhani

   on Nov 22, 2022

   More actions

   Hello! Would you mind creating a pull request on my fork so that I may include your suggestions?

   Thanks!