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<?php
/**
* PEAR_Frontend, the singleton-based frontend for user input/output
*
* PHP versions 4 and 5
*
* @category pear
* @package PEAR
* @author Greg Beaver <cellog@php.net>
* @copyright 1997-2009 The Authors
* @license http://opensource.org/licenses/bsd-license.php New BSD License
* @link http://pear.php.net/package/PEAR
* @since File available since Release 1.4.0a1
*/
/**
* Include error handling
*/
//require_once 'PEAR.php';
/**
* Which user interface class is being used.
* @var string class name
*/
$GLOBALS['_PEAR_FRONTEND_CLASS'] = 'PEAR_Frontend_CLI';
/**
* Instance of $_PEAR_Command_uiclass.
* @var object
*/
$GLOBALS['_PEAR_FRONTEND_SINGLETON'] = null;
/**
* Singleton-based frontend for PEAR user input/output
*
* @category pear
* @package PEAR
* @author Greg Beaver <cellog@php.net>
* @copyright 1997-2009 The Authors
* @license http://opensource.org/licenses/bsd-license.php New BSD License
* @version Release: 1.10.16
* @link http://pear.php.net/package/PEAR
* @since Class available since Release 1.4.0a1
*/
class PEAR_Frontend extends PEAR
{
/**
* Retrieve the frontend object
* @return PEAR_Frontend_CLI|PEAR_Frontend_Web|PEAR_Frontend_Gtk
*/
public static function &singleton($type = null)
{
if ($type === null) {
if (!isset($GLOBALS['_PEAR_FRONTEND_SINGLETON'])) {
$a = false;
return $a;
}
return $GLOBALS['_PEAR_FRONTEND_SINGLETON'];
}
$a = PEAR_Frontend::setFrontendClass($type);
return $a;
}
/**
* Set the frontend class that will be used by calls to {@link singleton()}
*
* Frontends are expected to conform to the PEAR naming standard of
* _ => DIRECTORY_SEPARATOR (PEAR_Frontend_CLI is in PEAR/Frontend/CLI.php)
* @param string $uiclass full class name
* @return PEAR_Frontend
*/
public static function &setFrontendClass($uiclass)
{
if (is_object($GLOBALS['_PEAR_FRONTEND_SINGLETON']) &&
is_a($GLOBALS['_PEAR_FRONTEND_SINGLETON'], $uiclass)) {
return $GLOBALS['_PEAR_FRONTEND_SINGLETON'];
}
if (!class_exists($uiclass)) {
$file = str_replace('_', '/', $uiclass) . '.php';
if (PEAR_Frontend::isIncludeable($file)) {
include_once $file;
}
}
if (class_exists($uiclass)) {
$obj = new $uiclass;
// quick test to see if this class implements a few of the most
// important frontend methods
if (is_a($obj, 'PEAR_Frontend')) {
$GLOBALS['_PEAR_FRONTEND_SINGLETON'] = &$obj;
$GLOBALS['_PEAR_FRONTEND_CLASS'] = $uiclass;
return $obj;
}
$err = PEAR::raiseError("not a frontend class: $uiclass");
return $err;
}
$err = PEAR::raiseError("no such class: $uiclass");
return $err;
}
/**
* Set the frontend class that will be used by calls to {@link singleton()}
*
* Frontends are expected to be a descendant of PEAR_Frontend
* @param PEAR_Frontend
* @return PEAR_Frontend
*/
public static function &setFrontendObject($uiobject)
{
if (is_object($GLOBALS['_PEAR_FRONTEND_SINGLETON']) &&
is_a($GLOBALS['_PEAR_FRONTEND_SINGLETON'], get_class($uiobject))) {
return $GLOBALS['_PEAR_FRONTEND_SINGLETON'];
}
if (!is_a($uiobject, 'PEAR_Frontend')) {
$err = PEAR::raiseError('not a valid frontend class: (' .
get_class($uiobject) . ')');
return $err;
}
$GLOBALS['_PEAR_FRONTEND_SINGLETON'] = &$uiobject;
$GLOBALS['_PEAR_FRONTEND_CLASS'] = get_class($uiobject);
return $uiobject;
}
/**
* @param string $path relative or absolute include path
* @return boolean
*/
public static function isIncludeable($path)
{
if (file_exists($path) && is_readable($path)) {
return true;
}
$fp = @fopen($path, 'r', true);
if ($fp) {
fclose($fp);
return true;
}
return false;
}
/**
* @param PEAR_Config
*/
function setConfig(&$config)
{
}
/**
* This can be overridden to allow session-based temporary file management
*
* By default, all files are deleted at the end of a session. The web installer
* needs to be able to sustain a list over many sessions in order to support
* user interaction with install scripts
*/
static function addTempFile($file)
{
$GLOBALS['_PEAR_Common_tempfiles'][] = $file;
}
/**
* Log an action
*
* @param string $msg the message to log
* @param boolean $append_crlf
* @return boolean true
* @abstract
*/
function log($msg, $append_crlf = true)
{
}
/**
* Run a post-installation script
*
* @param array $scripts array of post-install scripts
* @abstract
*/
function runPostinstallScripts(&$scripts)
{
}
/**
* Display human-friendly output formatted depending on the
* $command parameter.
*
* This should be able to handle basic output data with no command
* @param mixed $data data structure containing the information to display
* @param string $command command from which this method was called
* @abstract
*/
function outputData($data, $command = '_default')
{
}
/**
* Display a modal form dialog and return the given input
*
* A frontend that requires multiple requests to retrieve and process
* data must take these needs into account, and implement the request
* handling code.
* @param string $command command from which this method was called
* @param array $prompts associative array. keys are the input field names
* and values are the description
* @param array $types array of input field types (text, password,
* etc.) keys have to be the same like in $prompts
* @param array $defaults array of default values. again keys have
* to be the same like in $prompts. Do not depend
* on a default value being set.
* @return array input sent by the user
* @abstract
*/
function userDialog($command, $prompts, $types = array(), $defaults = array())
{
}
}
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