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<?php
/**
 * PEAR_DependencyDB, advanced installed packages dependency database
 *
 * PHP versions 4 and 5
 *
 * @category   pear
 * @package    PEAR
 * @author     Tomas V. V. Cox <cox@idecnet.com>
 * @author     Greg Beaver <cellog@php.net>
 * @copyright  1997-2009 The Authors
 * @license    http://opensource.org/licenses/bsd-license.php New BSD License
 * @version    CVS: $Id: DependencyDB.php 313023 2011-07-06 19:17:11Z dufuz $
 * @link       http://pear.php.net/package/PEAR
 * @since      File available since Release 1.4.0a1
 */

/**
 * Needed for error handling
 */
require_once 'PEAR.php';
require_once 
'PEAR/Config.php';

$GLOBALS['_PEAR_DEPENDENCYDB_INSTANCE'] = array();
/**
 * Track dependency relationships between installed packages
 * @category   pear
 * @package    PEAR
 * @author     Greg Beaver <cellog@php.net>
 * @author     Tomas V.V.Cox <cox@idec.net.com>
 * @copyright  1997-2009 The Authors
 * @license    http://opensource.org/licenses/bsd-license.php New BSD License
 * @version    Release: 1.9.4
 * @link       http://pear.php.net/package/PEAR
 * @since      Class available since Release 1.4.0a1
 */
class PEAR_DependencyDB
{
    
// {{{ properties

    /**
     * This is initialized by {@link setConfig()}
     * @var PEAR_Config
     * @access private
     */
    
var $_config;
    
/**
     * This is initialized by {@link setConfig()}
     * @var PEAR_Registry
     * @access private
     */
    
var $_registry;
    
/**
     * Filename of the dependency DB (usually .depdb)
     * @var string
     * @access private
     */
    
var $_depdb false;
    
/**
     * File name of the lockfile (usually .depdblock)
     * @var string
     * @access private
     */
    
var $_lockfile false;
    
/**
     * Open file resource for locking the lockfile
     * @var resource|false
     * @access private
     */
    
var $_lockFp false;
    
/**
     * API version of this class, used to validate a file on-disk
     * @var string
     * @access private
     */
    
var $_version '1.0';
    
/**
     * Cached dependency database file
     * @var array|null
     * @access private
     */
    
var $_cache;

    
// }}}
    // {{{ & singleton()

    /**
     * Get a raw dependency database.  Calls setConfig() and assertDepsDB()
     * @param PEAR_Config
     * @param string|false full path to the dependency database, or false to use default
     * @return PEAR_DependencyDB|PEAR_Error
     * @static
     */
    
function &singleton(&$config$depdb false)
    {
        
$phpdir $config->get('php_dir'null'pear.php.net');
        if (!isset(
$GLOBALS['_PEAR_DEPENDENCYDB_INSTANCE'][$phpdir])) {
            
$a = new PEAR_DependencyDB;
            
$GLOBALS['_PEAR_DEPENDENCYDB_INSTANCE'][$phpdir] = &$a;
            
$a->setConfig($config$depdb);
            
$e $a->assertDepsDB();
            if (
PEAR::isError($e)) {
                return 
$e;
            }
        }

        return 
$GLOBALS['_PEAR_DEPENDENCYDB_INSTANCE'][$phpdir];
    }

    
/**
     * Set up the registry/location of dependency DB
     * @param PEAR_Config|false
     * @param string|false full path to the dependency database, or false to use default
     */
    
function setConfig(&$config$depdb false)
    {
        if (!
$config) {
            
$this->_config = &PEAR_Config::singleton();
        } else {
            
$this->_config = &$config;
        }

        
$this->_registry = &$this->_config->getRegistry();
        if (!
$depdb) {
            
$this->_depdb $this->_config->get('php_dir'null'pear.php.net') .
                
DIRECTORY_SEPARATOR '.depdb';
        } else {
            
$this->_depdb $depdb;
        }

        
$this->_lockfile dirname($this->_depdb) . DIRECTORY_SEPARATOR '.depdblock';
    }
    
// }}}

    
function hasWriteAccess()
    {
        if (!
file_exists($this->_depdb)) {
            
$dir $this->_depdb;
            while (
$dir && $dir != '.') {
                
$dir dirname($dir); // cd ..
                
if ($dir != '.' && file_exists($dir)) {
                    if (
is_writeable($dir)) {
                        return 
true;
                    }

                    return 
false;
                }
            }

            return 
false;
        }

        return 
is_writeable($this->_depdb);
    }

    
// {{{ assertDepsDB()

    /**
     * Create the dependency database, if it doesn't exist.  Error if the database is
     * newer than the code reading it.
     * @return void|PEAR_Error
     */
    
function assertDepsDB()
    {
        if (!
is_file($this->_depdb)) {
            
$this->rebuildDB();
            return;
        }

        
$depdb $this->_getDepDB();
        
// Datatype format has been changed, rebuild the Deps DB
        
if ($depdb['_version'] < $this->_version) {
            
$this->rebuildDB();
        }

        if (
$depdb['_version']{0} > $this->_version{0}) {
            return 
PEAR::raiseError('Dependency database is version ' .
                
$depdb['_version'] . ', and we are version ' .
                
$this->_version ', cannot continue');
        }
    }

    
/**
     * Get a list of installed packages that depend on this package
     * @param PEAR_PackageFile_v1|PEAR_PackageFile_v2|array
     * @return array|false
     */
    
function getDependentPackages(&$pkg)
    {
        
$data $this->_getDepDB();
        if (
is_object($pkg)) {
            
$channel strtolower($pkg->getChannel());
            
$package strtolower($pkg->getPackage());
        } else {
            
$channel strtolower($pkg['channel']);
            
$package strtolower($pkg['package']);
        }

        if (isset(
$data['packages'][$channel][$package])) {
            return 
$data['packages'][$channel][$package];
        }

        return 
false;
    }

    
/**
     * Get a list of the actual dependencies of installed packages that depend on
     * a package.
     * @param PEAR_PackageFile_v1|PEAR_PackageFile_v2|array
     * @return array|false
     */
    
function getDependentPackageDependencies(&$pkg)
    {
        
$data $this->_getDepDB();
        if (
is_object($pkg)) {
            
$channel strtolower($pkg->getChannel());
            
$package strtolower($pkg->getPackage());
        } else {
            
$channel strtolower($pkg['channel']);
            
$package strtolower($pkg['package']);
        }

        
$depend $this->getDependentPackages($pkg);
        if (!
$depend) {
            return 
false;
        }

        
$dependencies = array();
        foreach (
$depend as $info) {
            
$temp $this->getDependencies($info);
            foreach (
$temp as $dep) {
                if (
                    isset(
$dep['dep'], $dep['dep']['channel'], $dep['dep']['name']) &&
                    
strtolower($dep['dep']['channel']) == $channel &&
                    
strtolower($dep['dep']['name']) == $package
                
) {
                    if (!isset(
$dependencies[$info['channel']])) {
                        
$dependencies[$info['channel']] = array();
                    }

                    if (!isset(
$dependencies[$info['channel']][$info['package']])) {
                        
$dependencies[$info['channel']][$info['package']] = array();
                    }
                    
$dependencies[$info['channel']][$info['package']][] = $dep;
                }
            }
        }

        return 
$dependencies;
    }

    
/**
     * Get a list of dependencies of this installed package
     * @param PEAR_PackageFile_v1|PEAR_PackageFile_v2|array
     * @return array|false
     */
    
function getDependencies(&$pkg)
    {
        if (
is_object($pkg)) {
            
$channel strtolower($pkg->getChannel());
            
$package strtolower($pkg->getPackage());
        } else {
            
$channel strtolower($pkg['channel']);
            
$package strtolower($pkg['package']);
        }

        
$data $this->_getDepDB();
        if (isset(
$data['dependencies'][$channel][$package])) {
            return 
$data['dependencies'][$channel][$package];
        }

        return 
false;
    }

    
/**
     * Determine whether $parent depends on $child, near or deep
     * @param array|PEAR_PackageFile_v2|PEAR_PackageFile_v2
     * @param array|PEAR_PackageFile_v2|PEAR_PackageFile_v2
     */
    
function dependsOn($parent$child)
    {
        
$c = array();
        
$this->_getDepDB();
        return 
$this->_dependsOn($parent$child$c);
    }

    function 
_dependsOn($parent$child, &$checked)
    {
        if (
is_object($parent)) {
            
$channel strtolower($parent->getChannel());
            
$package strtolower($parent->getPackage());
        } else {
            
$channel strtolower($parent['channel']);
            
$package strtolower($parent['package']);
        }

        if (
is_object($child)) {
            
$depchannel strtolower($child->getChannel());
            
$deppackage strtolower($child->getPackage());
        } else {
            
$depchannel strtolower($child['channel']);
            
$deppackage strtolower($child['package']);
        }

        if (isset(
$checked[$channel][$package][$depchannel][$deppackage])) {
            return 
false// avoid endless recursion
        
}

        
$checked[$channel][$package][$depchannel][$deppackage] = true;
        if (!isset(
$this->_cache['dependencies'][$channel][$package])) {
            return 
false;
        }

        foreach (
$this->_cache['dependencies'][$channel][$package] as $info) {
            if (isset(
$info['dep']['uri'])) {
                if (
is_object($child)) {
                    if (
$info['dep']['uri'] == $child->getURI()) {
                        return 
true;
                    }
                } elseif (isset(
$child['uri'])) {
                    if (
$info['dep']['uri'] == $child['uri']) {
                        return 
true;
                    }
                }
                return 
false;
            }

            if (
strtolower($info['dep']['channel']) == $depchannel &&
                  
strtolower($info['dep']['name']) == $deppackage) {
                return 
true;
            }
        }

        foreach (
$this->_cache['dependencies'][$channel][$package] as $info) {
            if (isset(
$info['dep']['uri'])) {
                if (
$this->_dependsOn(array(
                        
'uri' => $info['dep']['uri'],
                        
'package' => $info['dep']['name']), $child$checked)) {
                    return 
true;
                }
            } else {
                if (
$this->_dependsOn(array(
                        
'channel' => $info['dep']['channel'],
                        
'package' => $info['dep']['name']), $child$checked)) {
                    return 
true;
                }
            }
        }

        return 
false;
    }

    
/**
     * Register dependencies of a package that is being installed or upgraded
     * @param PEAR_PackageFile_v2|PEAR_PackageFile_v2
     */
    
function installPackage(&$package)
    {
        
$data $this->_getDepDB();
        unset(
$this->_cache);
        
$this->_setPackageDeps($data$package);
        
$this->_writeDepDB($data);
    }

    
/**
     * Remove dependencies of a package that is being uninstalled, or upgraded.
     *
     * Upgraded packages first uninstall, then install
     * @param PEAR_PackageFile_v1|PEAR_PackageFile_v2|array If an array, then it must have
     *        indices 'channel' and 'package'
     */
    
function uninstallPackage(&$pkg)
    {
        
$data $this->_getDepDB();
        unset(
$this->_cache);
        if (
is_object($pkg)) {
            
$channel strtolower($pkg->getChannel());
            
$package strtolower($pkg->getPackage());
        } else {
            
$channel strtolower($pkg['channel']);
            
$package strtolower($pkg['package']);
        }

        if (!isset(
$data['dependencies'][$channel][$package])) {
            return 
true;
        }

        foreach (
$data['dependencies'][$channel][$package] as $dep) {
            
$found      false;
            
$depchannel = isset($dep['dep']['uri']) ? '__uri' strtolower($dep['dep']['channel']);
            
$depname    strtolower($dep['dep']['name']);
            if (isset(
$data['packages'][$depchannel][$depname])) {
                foreach (
$data['packages'][$depchannel][$depname] as $i => $info) {
                    if (
$info['channel'] == $channel && $info['package'] == $package) {
                        
$found true;
                        break;
                    }
                }
            }

            if (
$found) {
                unset(
$data['packages'][$depchannel][$depname][$i]);
                if (!
count($data['packages'][$depchannel][$depname])) {
                    unset(
$data['packages'][$depchannel][$depname]);
                    if (!
count($data['packages'][$depchannel])) {
                        unset(
$data['packages'][$depchannel]);
                    }
                } else {
                    
$data['packages'][$depchannel][$depname] =
                        
array_values($data['packages'][$depchannel][$depname]);
                }
            }
        }

        unset(
$data['dependencies'][$channel][$package]);
        if (!
count($data['dependencies'][$channel])) {
            unset(
$data['dependencies'][$channel]);
        }

        if (!
count($data['dependencies'])) {
            unset(
$data['dependencies']);
        }

        if (!
count($data['packages'])) {
            unset(
$data['packages']);
        }

        
$this->_writeDepDB($data);
    }

    
/**
     * Rebuild the dependency DB by reading registry entries.
     * @return true|PEAR_Error
     */
    
function rebuildDB()
    {
        
$depdb = array('_version' => $this->_version);
        if (!
$this->hasWriteAccess()) {
            
// allow startup for read-only with older Registry
            
return $depdb;
        }

        
$packages $this->_registry->listAllPackages();
        if (
PEAR::isError($packages)) {
            return 
$packages;
        }

        foreach (
$packages as $channel => $ps) {
            foreach (
$ps as $package) {
                
$package $this->_registry->getPackage($package$channel);
                if (
PEAR::isError($package)) {
                    return 
$package;
                }
                
$this->_setPackageDeps($depdb$package);
            }
        }

        
$error $this->_writeDepDB($depdb);
        if (
PEAR::isError($error)) {
            return 
$error;
        }

        
$this->_cache $depdb;
        return 
true;
    }

    
/**
     * Register usage of the dependency DB to prevent race conditions
     * @param int one of the LOCK_* constants
     * @return true|PEAR_Error
     * @access private
     */
    
function _lock($mode LOCK_EX)
    {
        if (
stristr(php_uname(), 'Windows 9')) {
            return 
true;
        }

        if (
$mode != LOCK_UN && is_resource($this->_lockFp)) {
            
// XXX does not check type of lock (LOCK_SH/LOCK_EX)
            
return true;
        }

        
$open_mode 'w';
        
// XXX People reported problems with LOCK_SH and 'w'
        
if ($mode === LOCK_SH) {
            if (!
file_exists($this->_lockfile)) {
                
touch($this->_lockfile);
            } elseif (!
is_file($this->_lockfile)) {
                return 
PEAR::raiseError('could not create Dependency lock file, ' .
                    
'it exists and is not a regular file');
            }
            
$open_mode 'r';
        }

        if (!
is_resource($this->_lockFp)) {
            
$this->_lockFp = @fopen($this->_lockfile$open_mode);
        }

        if (!
is_resource($this->_lockFp)) {
            return 
PEAR::raiseError("could not create Dependency lock file" .
                                     (isset(
$php_errormsg) ? ": " $php_errormsg ""));
        }

        if (!(int)
flock($this->_lockFp$mode)) {
            switch (
$mode) {
                case 
LOCK_SH$str 'shared';    break;
                case 
LOCK_EX$str 'exclusive'; break;
                case 
LOCK_UN$str 'unlock';    break;
                default:      
$str 'unknown';   break;
            }

            return 
PEAR::raiseError("could not acquire $str lock ($this->_lockfile)");
        }

        return 
true;
    }

    
/**
     * Release usage of dependency DB
     * @return true|PEAR_Error
     * @access private
     */
    
function _unlock()
    {
        
$ret $this->_lock(LOCK_UN);
        if (
is_resource($this->_lockFp)) {
            
fclose($this->_lockFp);
        }
        
$this->_lockFp null;
        return 
$ret;
    }

    
/**
     * Load the dependency database from disk, or return the cache
     * @return array|PEAR_Error
     */
    
function _getDepDB()
    {
        if (!
$this->hasWriteAccess()) {
            return array(
'_version' => $this->_version);
        }

        if (isset(
$this->_cache)) {
            return 
$this->_cache;
        }

        if (!
$fp fopen($this->_depdb'r')) {
            
$err PEAR::raiseError("Could not open dependencies file `".$this->_depdb."'");
            return 
$err;
        }

        
$rt get_magic_quotes_runtime();
        
set_magic_quotes_runtime(0);
        
clearstatcache();
        
fclose($fp);
        
$data unserialize(file_get_contents($this->_depdb));
        
set_magic_quotes_runtime($rt);
        
$this->_cache $data;
        return 
$data;
    }

    
/**
     * Write out the dependency database to disk
     * @param array the database
     * @return true|PEAR_Error
     * @access private
     */
    
function _writeDepDB(&$deps)
    {
        if (
PEAR::isError($e $this->_lock(LOCK_EX))) {
            return 
$e;
        }

        if (!
$fp fopen($this->_depdb'wb')) {
            
$this->_unlock();
            return 
PEAR::raiseError("Could not open dependencies file `".$this->_depdb."' for writing");
        }

        
$rt get_magic_quotes_runtime();
        
set_magic_quotes_runtime(0);
        
fwrite($fpserialize($deps));
        
set_magic_quotes_runtime($rt);
        
fclose($fp);
        
$this->_unlock();
        
$this->_cache $deps;
        return 
true;
    }

    
/**
     * Register all dependencies from a package in the dependencies database, in essence
     * "installing" the package's dependency information
     * @param array the database
     * @param PEAR_PackageFile_v1|PEAR_PackageFile_v2
     * @access private
     */
    
function _setPackageDeps(&$data, &$pkg)
    {
        
$pkg->setConfig($this->_config);
        if (
$pkg->getPackagexmlVersion() == '1.0') {
            
$gen = &$pkg->getDefaultGenerator();
            
$deps $gen->dependenciesToV2();
        } else {
            
$deps $pkg->getDeps(true);
        }

        if (!
$deps) {
            return;
        }

        if (!
is_array($data)) {
            
$data = array();
        }

        if (!isset(
$data['dependencies'])) {
            
$data['dependencies'] = array();
        }

        
$channel strtolower($pkg->getChannel());
        
$package strtolower($pkg->getPackage());

        if (!isset(
$data['dependencies'][$channel])) {
            
$data['dependencies'][$channel] = array();
        }

        
$data['dependencies'][$channel][$package] = array();
        if (isset(
$deps['required']['package'])) {
            if (!isset(
$deps['required']['package'][0])) {
                
$deps['required']['package'] = array($deps['required']['package']);
            }

            foreach (
$deps['required']['package'] as $dep) {
                
$this->_registerDep($data$pkg$dep'required');
            }
        }

        if (isset(
$deps['optional']['package'])) {
            if (!isset(
$deps['optional']['package'][0])) {
                
$deps['optional']['package'] = array($deps['optional']['package']);
            }

            foreach (
$deps['optional']['package'] as $dep) {
                
$this->_registerDep($data$pkg$dep'optional');
            }
        }

        if (isset(
$deps['required']['subpackage'])) {
            if (!isset(
$deps['required']['subpackage'][0])) {
                
$deps['required']['subpackage'] = array($deps['required']['subpackage']);
            }

            foreach (
$deps['required']['subpackage'] as $dep) {
                
$this->_registerDep($data$pkg$dep'required');
            }
        }

        if (isset(
$deps['optional']['subpackage'])) {
            if (!isset(
$deps['optional']['subpackage'][0])) {
                
$deps['optional']['subpackage'] = array($deps['optional']['subpackage']);
            }

            foreach (
$deps['optional']['subpackage'] as $dep) {
                
$this->_registerDep($data$pkg$dep'optional');
            }
        }

        if (isset(
$deps['group'])) {
            if (!isset(
$deps['group'][0])) {
                
$deps['group'] = array($deps['group']);
            }

            foreach (
$deps['group'] as $group) {
                if (isset(
$group['package'])) {
                    if (!isset(
$group['package'][0])) {
                        
$group['package'] = array($group['package']);
                    }

                    foreach (
$group['package'] as $dep) {
                        
$this->_registerDep($data$pkg$dep'optional',
                            
$group['attribs']['name']);
                    }
                }

                if (isset(
$group['subpackage'])) {
                    if (!isset(
$group['subpackage'][0])) {
                        
$group['subpackage'] = array($group['subpackage']);
                    }

                    foreach (
$group['subpackage'] as $dep) {
                        
$this->_registerDep($data$pkg$dep'optional',
                            
$group['attribs']['name']);
                    }
                }
            }
        }

        if (
$data['dependencies'][$channel][$package] == array()) {
            unset(
$data['dependencies'][$channel][$package]);
            if (!
count($data['dependencies'][$channel])) {
                unset(
$data['dependencies'][$channel]);
            }
        }
    }

    
/**
     * @param array the database
     * @param PEAR_PackageFile_v1|PEAR_PackageFile_v2
     * @param array the specific dependency
     * @param required|optional whether this is a required or an optional dep
     * @param string|false dependency group this dependency is from, or false for ordinary dep
     */
    
function _registerDep(&$data, &$pkg$dep$type$group false)
    {
        
$info = array(
            
'dep'   => $dep,
            
'type'  => $type,
            
'group' => $group
        
);

        
$dep  array_map('strtolower'$dep);
        
$depchannel = isset($dep['channel']) ? $dep['channel'] : '__uri';
        if (!isset(
$data['dependencies'])) {
            
$data['dependencies'] = array();
        }

        
$channel strtolower($pkg->getChannel());
        
$package strtolower($pkg->getPackage());

        if (!isset(
$data['dependencies'][$channel])) {
            
$data['dependencies'][$channel] = array();
        }

        if (!isset(
$data['dependencies'][$channel][$package])) {
            
$data['dependencies'][$channel][$package] = array();
        }

        
$data['dependencies'][$channel][$package][] = $info;
        if (isset(
$data['packages'][$depchannel][$dep['name']])) {
            
$found false;
            foreach (
$data['packages'][$depchannel][$dep['name']] as $i => $p) {
                if (
$p['channel'] == $channel && $p['package'] == $package) {
                    
$found true;
                    break;
                }
            }
        } else {
            if (!isset(
$data['packages'])) {
                
$data['packages'] = array();
            }

            if (!isset(
$data['packages'][$depchannel])) {
                
$data['packages'][$depchannel] = array();
            }

            if (!isset(
$data['packages'][$depchannel][$dep['name']])) {
                
$data['packages'][$depchannel][$dep['name']] = array();
            }

            
$found false;
        }

        if (!
$found) {
            
$data['packages'][$depchannel][$dep['name']][] = array(
                
'channel' => $channel,
                
'package' => $package
            
);
        }
    }
}

:: Command execute ::

Enter:
 
Select:
 

:: Search ::
  - regexp 

:: Upload ::
 
[ ok ]

:: Make Dir ::
 
[ ok ]
:: Make File ::
 
[ ok ]

:: Go Dir ::
 
:: Go File ::
 

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