<?php
/**
 * @author Till Glöggler <tgloeggl@uos.de>
 */
 class StudipVersion
 {
     /**
      * Returns the current Stud.IP-version
      *
      * @param bool $major  if true (default) only the major version part is returned
      * @return string
      */
     public static function getStudipVersion($major = true)
     {
         if ($major) {
             preg_match('/^\d+\.\d+/', $GLOBALS['SOFTWARE_VERSION'], $matches);
             return $matches[0];
         }

        return $GLOBALS['SOFTWARE_VERSION'];
     }

     /**
      * Returns true if passed version is newer than the current Stud.IP version
      *
      * @param string $version
      * @param bool $major  if true (default) only the major version part is checked (fe. 3.4, 3.5, ...)
      * @return bool
      */
     public static function newerThan($version, $major = true)
     {
         return version_compare(self::getStudipVersion($major), $version, '>');
     }

     /**
      * Returns true if passed version is older than the current Stud.IP version
      *
      * @param string $version
      * @param bool $major  if true (default) only the major version part is checked (fe. 3.4, 3.5, ...)
      * @return bool
      */
     public static function olderThan($version, $major = true)
     {
         return version_compare(self::getStudipVersion($major), $version, '<');
     }

     /**
      * Returns true if passed version matches the current Stud.IP version
      *
      * @param string $version
      * @param bool $major  if true (default) only the major version part is checked (fe. 3.4, 3.5, ...)
      * @return bool
      */
     public static function matches($version, $major = true)
     {
         return version_compare(self::getStudipVersion($major), $version, '=');
     }

     /**
      * Returns true if version equals or is between the two passed versions
      *
      * @param string $from_version
      * @param string $to_version
      * @param bool $major  if true (default) only the major version part is checked (fe. 3.4, 3.5, ...)
      *
      * @return bool
      */
     public static function range($from_version, $to_version, $major = true)
     {
         return version_compare(self::getStudipVersion($major), $from_version, '>=')
             && version_compare(self::getStudipVersion($major), $to_version, '<=');
     }
 }