Internationalization

[squirrelmail.git] / functions / gettext.php

<?PHP

   /* Alternate to the system's built-in gettext.
    * relies on .po files (can't read .mo easily).
    * Uses the session for caching (speed increase)
    * Possible use in other PHP scripts?  The only SM-specific thing is
    *   $sm_language, I think
    *
    * Very special thanks to Konstantin Riabitsev for letting me use a
    * server that didn't already have gettext on it!
    */
     
   if (defined('gettext_php'))
      return;
   define('gettext_php', true);
   
   global $gettext_php_domain, $gettext_php_dir, $gettext_php_loaded,
      $gettext_php_translateStrings, $gettext_php_loaded_language,
      $gettext_php_short_circuit;
   
   if (! isset($gettext_php_loaded)) {
      $gettext_php_loaded = false;
      session_register('gettext_php_loaded');
   }
   if (! isset($gettext_php_domain)) {
      $gettext_php_domain = '';
      session_register('gettext_php_domain');
   }
   if (! isset($gettext_php_dir)) {
      $gettext_php_dir = '';
      session_register('gettext_php_dir');
   }
   if (! isset($gettext_php_translateStrings)) {
      $gettext_php_translateStrings = array();
      session_register('gettext_php_translateStrings');
   }
   if (! isset($gettext_php_loaded_language)) {
      $gettext_php_loaded_language = '';
      session_register('gettext_php_loaded_language');
   }

   function gettext_php_load_strings() {
      global $squirrelmail_language, $gettext_php_translateStrings,
         $gettext_php_domain, $gettext_php_dir, $gettext_php_loaded,
         $gettext_php_loaded_language, $gettext_php_short_circuit;
      
      // $squirrelmail_language gives 'en' for English, 'de' for German,
      // etc.  I didn't wanna use getenv or similar, but you easily could
      // change my code to do that.
      
      $gettext_php_translateStrings = array();
      
      $gettext_php_short_circuit = false;  // initialization

      $filename = $gettext_php_dir;
      if (substr($filename, -1) != '/')
         $filename .= '/';
      $filename .= $squirrelmail_language . '/LC_MESSAGES/' . 
         $gettext_php_domain . '.po';
      
      $file = @fopen($filename, 'r');
      if ($file === false) {
         // Uh-ho -- we can't load the file.  Just fake it.  :-)
	 // This is also for English, which doesn't use translations
         $gettext_php_loaded = true;
         $gettext_php_loaded_language = $squirrelmail_language;
	 $gettext_php_short_circuit = true;  // Avoid fuzzy matching when we
	                                     // didn't load strings
         return;
      }
	  
      $key = '';
      $SkipRead = false;
      while (! feof($file)) {
         if (! $SkipRead)
            $line = trim(fgets($file, 4096));
	 else
	    $SkipRead = false;
	     
         if (ereg('^msgid "(.*)"$', $line, $match)) {
	    if ($match[1] == '') {
	       // Potential multi-line
	       // msgid ""
	       // "string string "
	       // "string string"
	       $key = '';
               $line = trim(fgets($file, 4096));
	       while (ereg('^[ ]*"(.*)"[ ]*$', $line, $match)) {
		  $key .= $match[1];
		  $line = trim(fgets($file, 4096));
	       }
               $SkipRead = true;
	    } else {
	       // msgid "string string"
	       $key = $match[1];
	    }
	 } elseif (ereg('^msgstr "(.*)"$', $line, $match)) {
	    if ($match[1] == '') {
	       // Potential multi-line
	       // msgstr ""
	       // "string string "
	       // "string string"
	       $gettext_php_translateStrings[$key] = '';
	       $line = trim(fgets($file, 4096));
	       while (ereg('^[ ]*"(.*)"[ ]*$', $line, $match)) {
		  $gettext_php_translateStrings[$key] .= $match[1];
		  $line = trim(fgets($file, 4096));
	       }
               $SkipRead = true;
	    } else {
	       // msgstr "string string"
	       $gettext_php_translateStrings[$key] = $match[1];
	    }
            $gettext_php_translateStrings[$key] =
               stripslashes($gettext_php_translateStrings[$key]);
	    $key = '';
	 }
      }
      fclose($file);

      $gettext_php_loaded = true;
      $gettext_php_loaded_language = $squirrelmail_language;
   }

   function _($str) {
      global $gettext_php_loaded, $gettext_php_translateStrings, 
         $squirrelmail_language, $gettext_php_loaded_language,
	 $gettext_php_short_circuit;
	 
      if (! $gettext_php_loaded || 
          $gettext_php_loaded_language != $squirrelmail_language)
         gettext_php_load_strings();

      // Try finding the exact string      
      if (isset($gettext_php_translateStrings[$str]))
         return $gettext_php_translateStrings[$str];
	 
      // See if we should short-circuit
      if ($gettext_php_short_circuit) {
         $gettext_php_translateStrings[$str] = $str;
	 return $str;
      }
      
      // Look for a string that is very close to the one we want
      // Very computationally expensive
      $oldPercent = 0;
      $oldStr = '';
      $newPercent = 0;
      foreach ($gettext_php_translateStrings as $k => $v) {
         similar_text($str, $k, $newPercent);
         if ($newPercent > $oldPercent) {
            $oldStr = $v;
            $oldPercent = $newPercent;
         }
      }
      // Require 80% match or better
      // Adjust to suit your needs
      if ($oldPercent > 80) {
         // Remember this so we don't need to search again
         $gettext_php_translateStrings[$str] = $oldStr;
         return $oldStr;
      }
      
      // Remember this so we don't need to search again
      $gettext_php_translateStrings[$str] = $str;
      return $str;
   }
   
   function bindtextdomain($name, $dir) {
      global $gettext_php_domain, $gettext_php_dir, $gettext_php_loaded;

      if ($gettext_php_domain != $name) {
         $gettext_php_domain = $name;
         $gettext_php_loaded = false;
      }
      if ($gettext_php_dir != $dir) {
         $gettext_php_dir = $dir;
         $gettext_php_loaded = false;
      }
      
      return $dir;
   }
   
   function textdomain($name = false) {
      global $gettext_php_domain, $gettext_php_loaded;

      if ($name != false && $gettext_php_domain != $name) {
         $gettext_php_domain = $name;
	 $gettext_php_loaded = false;
      }
      return $gettext_php_domain;
   }