Alex72RM [Alex72RM]

1. The file LICENSE.txt needs to be removed; Drupal.org CVS doesn't allow to commit that file.
2. It's not clear if the file stem.class.php is available from third-party sites. If it is, it needs to be removed, and users need information on where to download it; if it is not, then it needs to be rewritten to follow the Drupal coding standards.

See the Drupal coding standards to understand how a module code should be written.
The coding standards contain a section about the string functions that a module needs to use.

The module is supposed to use Drupal Unicode functions that handle multibyte strings; this means it should use drupal_strlen() rather than strlen(), etc.

    if ($str != $str_step_1) return $str_step_1;
    
    $str_len = strlen($str);
    
    if (count($ret_str = $this->delete_suff($this->suffissi_step_2, $str, $str_len, 'rv'))) return $ret_str;
    
    return $str;

The coding standards also report how to format code; the above code is not formatted as suggested.

    if (drupal_strlen($str)<2) 
		return '';//$str;

IF-statement should be written as

  if ($condition1) {
    // Instructions.
  }
  elseif ($condition2) {
    // Instructions.
  }
  else {
    // Instructions.
  }

Check also the indentation that in some cases seems to not be correct (for each indentation, you should add or remove two spaces).

      $pos_b = strpos($ante_suff, $ante_b, $ante_suff_len-drupal_strlen($ante_b));
      if ($pos_b !== FALSE) {
        return drupal_substr($str, 0, $pos+$str_len-$rv_len) .'e';
      }

The code should be use drupal_strpos(). There are some minor formatting issues (i.e., $ante_suff_len-drupal_strlen($ante_b) should be re-written as $ante_suff_len - drupal_strlen($ante_b); see the Drupal coding standards for more details).

    if ($ovunque) {

The variables should be named using English words; the same is true for the comments.

A comment: drupal_strpos() doesn't exist.

That is true; I always get confused with drupal_substr().

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