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<?php
//
// +----------------------------------------------------------------------+
// | PHP Version 4 |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2002 The PHP Group |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.02 of the PHP license, |
// | that is bundled with this package in the file LICENSE, and is |
// | available at through the world-wide-web at |
// | http://www.php.net/license/2_02.txt. |
// | If you did not receive a copy of the PHP license and are unable to |
// | obtain it through the world-wide-web, please send a note to |
// | license@php.net so we can mail you a copy immediately. |
// +----------------------------------------------------------------------+
// | Authors: Tomas V.V.Cox <cox@idecnet.com> |
// | Stig Bakken <ssb@fast.no> |
// | |
// +----------------------------------------------------------------------+
//
// $Id$
/**
* Methods for dependencies check. Based on Stig's dependencies RFC
* at http://cvs.php.net/cvs.php/pearweb/rfc
* (requires php >= 4.1)
*/
require_once "PEAR.php";
class PEAR_Dependency
{
/**
* Package dependencies check method
*
* @param string $name Name of the package to test
* @param string $version The package version required
* @param string $relation How to compare versions with eachother
*
* @return bool whether the dependency is satisfied
*/
function checkPackage($name, $req_ver = null, $relation = 'has')
{
if (empty($this->registry)) {
$this->registry = new PEAR_Registry;
}
$pkg_ver = $this->registry->packageInfo($name, 'version');
if ($relation == 'has') {
return $this->registry->packageExists($name);
}
if (substr($relation, 0, 2) == 'v.') {
$operator = substr($relation, 2);
return version_compare($req_ver, $pkg_ver, $operator);
}
return false;
}
/**
* Extension dependencies check method
*
* @param string $name Name of the extension to test
* @param string $req_ext_ver Required extension version to compare with
* @param string $relation How to compare versions with eachother
*
* @return bool whether the dependency is satisfied
*/
function checkExtension($name, $req_ver = null, $relation = 'has')
{
// XXX (ssb): could we avoid loading the extension here?
if (!extension_loaded($name)) {
$dlext = OS_WINDOWS ? '.dll' : '.so';
if (!@dl($name . $dlext)) {
return false;
}
}
$ext_ver = phpversion($name);
if ($relation == 'has') {
return true;
}
if (substr($relation, 0, 2) == 'v.') {
$operator = substr($relation, 2);
return version_compare($req_ver, $ext_ver, $operator);
}
return false;
}
/**
* Operating system dependencies check method
*
* @param string $os Name of the operating system
*
* @return bool whether we're running on $os
*/
function checkOS($os)
{
// only 'has' relation is supported
return ($os == PHP_OS);
}
/**
* PHP version check method
*
* @param string $req_ver which version to compare
* @param string $relation how to compare the version
*
* @return bool whether the dependency is satisfied
*/
function checkPHP($req_ver, $relation = 'ge')
{
$php_ver = phpversion();
if (substr($relation, 0, 2) == 'v.') {
$operator = substr($relation, 2);
return version_compare($req_ver, $php_ver, $operator);
}
return true;
}
/**
* External program check method. Looks for executable files in
* directories listed in the PATH environment variable.
*
* @param string $program which program to look for
*
* @return bool whether the dependency is satisfied
*/
function checkProgram($program)
{
// XXX FIXME honor safe mode
$path_delim = OS_WINDOWS ? ';' : ':';
$exe_suffix = OS_WINDOWS ? '.exe' : '';
$path_elements = explode($path_delim, $_ENV['PATH']);
foreach ($path_elements as $dir) {
$file = "$dir/$program{$exe_suffix}";
if (file_exists($file) && is_executable($file)) {
return true;
}
}
return false;
}
/**
* SAPI backend check method. Version comparison is not yet
* available here.
*
* @param string $name name of SAPI backend
* @param string $req_ver which version to compare
* @param string $relation how to compare versions (currently
* hardcoded to 'has')
*/
function checkSAPI($name, $req_ver = null, $relation = 'has')
{
$sapi_backend = php_sapi_name();
// Version comparisons not supported, sapi backends don't have
// version information yet.
return ($sapi_backend == $name);
}
}
?>
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