Method scan_ident_middle

sql/sql_lex.cc:2894–2992

int Lex_input_stream::scan_ident_middle(THD *thd, Lex_ident_cli_st *str,
                                        CHARSET_INFO **introducer,
                                        my_lex_states *st)
{
  CHARSET_INFO *const cs= thd->charset();
  const uchar *const ident_map= cs->ident_map;
  const uchar *const state_map= cs->state_map;
  const char *start;
  uint length;
  uchar c;
  bool is_8bit;
  bool resolve_introducer= true;
  DBUG_ASSERT(m_ptr == m_tok_start + 1); // m_ptr points to the second byte

  if (cs->use_mb())
  {
    is_8bit= true;
    int char_length= cs->charlen(get_ptr() - 1, get_end_of_query());
    if (char_length <= 0)
    {
      *st= MY_LEX_CHAR;
      return 0;
    }
    skip_binary(char_length - 1);

    while (ident_map[c= yyGet()])
    {
      char_length= cs->charlen(get_ptr() - 1, get_end_of_query());
      if (char_length <= 0)
        break;
      if (char_length > 1 || (c & 0x80))
        resolve_introducer= false;
      skip_binary(char_length - 1);
    }
  }
  else
  {
    is_8bit= get_7bit_or_8bit_ident(thd, &c) || (m_tok_start[0] & 0x80);
    resolve_introducer= !is_8bit;
  }
  length= yyLength();
  start= get_ptr();
  if (ignore_space)
  {
    /*
      If we find a space then this can't be an identifier. We notice this
      below by checking start != lex->ptr.
    */
    for (; state_map[(uchar) c] == MY_LEX_SKIP ; c= yyGet())
    {
      if (c == '\n')
        yylineno++;
    }
  }
  if (start == get_ptr() && c == '.' && ident_map[(uchar) yyPeek()])
    next_state= MY_LEX_IDENT_SEP;
  else
  {                                    // '(' must follow directly if function