<?php
/***********************************************************************
* Php-Script umd Kommentare, Leezeichen und Leerzeilen zu entfernen
* Stand 17.11.2020
* Version 1.3
***********************************************************************/
define('NL',  "\n");
define('TB',  "\t");
define('WS',  ' ');

/***********************************************************************
*** Functions ***
***********************************************************************/

function removePhpComments($str){  

  $commentTokens = [
    \T_COMMENT,
    \T_DOC_COMMENT,
  ];
 
  $str = str_replace("\r", '', $str);
  $tokens = token_get_all($str);
  
  $s = '';
  foreach ($tokens as $token) {
    if (is_array($token)) {
      if (in_array($token[0], $commentTokens)) {
        if (substr($token[1], -1) == NL) $s .= NL; # keep \n from comment with \n at end of comment string
        continue;
      }
      $token = $token[1];
    }
    $s .= $token;
  }
  return $s;
}


function removeEmptyLines($str, $max = false) {

  # delete whitespace at end of line  
  do {
    $str = str_replace(WS . NL, NL, $str);
  } while (strpos($str, WS . NL) > 0);
  # delete tab at end of line
  do {
    $str = str_replace(TB . NL, NL, $str); 
  } while (strpos($str, TB . NL) > 0);
    
  if ($max === true) {      
    $find = NL . NL;
    $replace = NL;
  } else {
    $find = NL . NL . NL;
    $replace = NL . NL;
  }

  do {
    $str = str_replace($find, $replace, $str);
  } while (strpos($str, $find) > 0);
  return $str;
}


# Should be run at last
function removeSpaces ($str) {

  # delete double spaces
  do {
    $str = str_replace(WS . WS, WS, $str); 
  } while (strpos($str, WS . WS) > 0);
    
  # deletespaces at start of line
  do {
    $str = str_replace(NL . WS, NL, $str); 
  } while (strpos($str, NL . WS) > 0);

  # delete tab at start of line
  do {
    $str = str_replace(NL . TB, NL, $str);
  } while (strpos($str, NL . TB) > 0);
  
  return $str;  
}

function cleanfile($file) {

  if (substr($file, -4) == '.php') {
    $str = file_get_contents($file);
    $str = removePhpComments($str);
    $str = removeEmptyLines($str);
    #$str = removeSpaces($str);

    if ($GLOBALS['keep_org'] === true) {
      $file = str_replace('.php', '.comment_free.php', $file);    
    }
    file_put_contents($file, $str);
  }
}

/***********************************************************************
*** Einstellungen ***
***********************************************************************/

# File or Folder to cleanup
$file_folder_org = 'org.php';

# keep original file (stongly recommended set to true)
$keep_org = true;

/***********************************************************************
*** Programm ***
***********************************************************************/
if (file_exists($file_folder_org)) {
  if (is_dir($file_folder_org)) {
    $files = scandir($file_folder_org);
    foreach ($files as $key => $value) {
      cleanfile($value);
    }  
  } else {
    cleanfile($file_folder_org);
  }
}
?>