Function json_nice

sql/item_jsonfunc.cc:307–447

static int json_nice(json_engine_t *je, String *nice_js,
                     Item_func_json_format::formats mode, int tab_size=4)
{
  int depth= 0;
  static const char *comma= ", ", *colon= "\": ";
  uint comma_len, colon_len;
  int first_value= 1;
  int value_size = 0;
  int curr_state= -1;
  int64_t value_len= 0;
  String curr_str{};

  nice_js->length(0);
  nice_js->set_charset(je->s.cs);

  if (nice_js->alloc(je->s.str_end - je->s.c_str + 32))
    goto error;
  
  DBUG_ASSERT(mode != Item_func_json_format::DETAILED ||
              (tab_size >= 0 && tab_size <= TAB_SIZE_LIMIT));

  if (mode == Item_func_json_format::LOOSE)
  {
    comma_len= 2;
    colon_len= 3;
  }
  else if (mode == Item_func_json_format::DETAILED)
  {
    comma_len= 1;
    colon_len= 3;
  }
  else
  {
    comma_len= 1;
    colon_len= 2;
  }

  do
  {
    curr_state= je->state;
    switch (je->state)
    {
    case JST_KEY:
      {
        const uchar *key_start= je->s.c_str;
        const uchar *key_end;

        do
        {
          key_end= je->s.c_str;
        } while (json_read_keyname_chr(je) == 0);
        
        if (unlikely(je->s.error))
          goto error;

        if (!first_value)
          nice_js->append(comma, comma_len);