Function json_path_setup

strings/json_lib.c:1191–1353

int json_path_setup(json_path_t *p,
                    CHARSET_INFO *i_cs, const uchar *str, const uchar *end)
{
  int c_len, t_next, state= PS_GO, is_negative_index= 0, is_last= 0,
  prev_value=0, is_to= 0, *cur_val;
  json_path_step_t *curr_step= NULL, *last_step= NULL;

  enum json_path_step_types double_wildcard= JSON_PATH_KEY_NULL;
  json_string_setup(&p->s, i_cs, str, end);

  curr_step= (json_path_step_t*)(p->steps.buffer);

  last_step= curr_step;
  curr_step->type= JSON_PATH_ARRAY_WILD;
  p->last_step_idx= 0;
  last_step->key= (const uchar*)"";
  p->mode_strict= FALSE;
  p->types_used= JSON_PATH_KEY_NULL;

  do
  {
    json_path_step_t *last_step=
     (json_path_step_t*)(p->steps.buffer) + p->last_step_idx;
    if ((c_len= json_next_char(&p->s)) <= 0)
      t_next= json_eos(&p->s) ? P_EOS : P_BAD;
    else
      t_next= (p->s.c_next >= 128) ? P_ETC : json_path_chr_map[p->s.c_next];

    if ((state= json_path_transitions[state][t_next]) < 0)
      return p->s.error= state;

    p->s.c_str+= c_len;

    switch (state)
    {
    case PS_LAX:
      if ((p->s.error= skip_string_verbatim(&p->s, "ax")))
        return 1;
      p->mode_strict= FALSE;
      continue;
    case PS_SCT:
      if ((p->s.error= skip_string_verbatim(&p->s, "rict")))
        return 1;
      p->mode_strict= TRUE;
      state= PS_LAX;
      continue;
    case PS_KWD:
    case PS_AWD:
      last_step->type|= JSON_PATH_WILD;
      p->types_used|= JSON_PATH_WILD;
      continue;
    case PS_INT:
      cur_val= is_to ? &(last_step->n_item_end) :
                       &(last_step->n_item);
      if (is_last)
      {
        prev_value*= 10;
        prev_value-= p->s.c_next - '0';