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<?php
/* vim: set expandtab tabstop=4 shiftwidth=4 foldmethod=marker: */
// +----------------------------------------------------------------------+
// | PEAR_Exception |
// +----------------------------------------------------------------------+
// | Copyright (c) 2004 The PEAR Group |
// +----------------------------------------------------------------------+
// | This source file is subject to version 3.0 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/3_0.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> |
// | Hans Lellelid <hans@velum.net> |
// | Bertrand Mansion <bmansion@mamasam.com> |
// | Greg Beaver <cellog@php.net> |
// +----------------------------------------------------------------------+
//
// $Id: Exception.php,v 1.4.2.2 2005/03/28 16:46:06 cellog Exp $
/**
* Base PEAR_Exception Class
*
* WARNING: This code should be considered stable, but the API is
* subject to immediate and drastic change, so API stability is
* at best alpha
*
* 1) Features:
*
* - Nestable exceptions (throw new PEAR_Exception($msg, $prev_exception))
* - Definable triggers, shot when exceptions occur
* - Pretty and informative error messages
* - Added more context info available (like class, method or cause)
* - cause can be a PEAR_Exception or an array of mixed
* PEAR_Exceptions/PEAR_ErrorStack warnings
* - callbacks for specific exception classes and their children
*
* 2) Ideas:
*
* - Maybe a way to define a 'template' for the output
*
* 3) Inherited properties from PHP Exception Class:
*
* protected $message
* protected $code
* protected $line
* protected $file
* private $trace
*
* 4) Inherited methods from PHP Exception Class:
*
* __clone
* __construct
* getMessage
* getCode
* getFile
* getLine
* getTraceSafe
* getTraceSafeAsString
* __toString
*
* 5) Usage example
*
* <code>
* require_once 'PEAR/Exception.php';
*
* class Test {
* function foo() {
* throw new PEAR_Exception('Error Message', ERROR_CODE);
* }
* }
*
* function myLogger($pear_exception) {
* echo $pear_exception->getMessage();
* }
* // each time a exception is thrown the 'myLogger' will be called
* // (its use is completely optional)
* PEAR_Exception::addObserver('myLogger');
* $test = new Test;
* try {
* $test->foo();
* } catch (PEAR_Exception $e) {
* print $e;
* }
* </code>
*
* @since PHP 5
* @package PEAR
* @version $Revision: 1.4.2.2 $
* @author Tomas V.V.Cox <cox@idecnet.com>
* @author Hans Lellelid <hans@velum.net>
* @author Bertrand Mansion <bmansion@mamasam.com>
*
*/
class PEAR_Exception extends Exception
{
const OBSERVER_PRINT = -2;
const OBSERVER_TRIGGER = -4;
const OBSERVER_DIE = -8;
protected $cause;
private static $_observers = array();
private static $_uniqueid = 0;
private $_trace;
/**
* Supported signatures:
* PEAR_Exception(string $message);
* PEAR_Exception(string $message, int $code);
* PEAR_Exception(string $message, Exception $cause);
* PEAR_Exception(string $message, Exception $cause, int $code);
* PEAR_Exception(string $message, array $causes);
* PEAR_Exception(string $message, array $causes, int $code);
*/
public function __construct($message, $p2 = null, $p3 = null)
{
if (is_int($p2)) {
$code = $p2;
$this->cause = null;
} elseif ($p2 instanceof Exception || is_array($p2)) {
$code = $p3;
if (is_array($p2) && isset($p2['message'])) {
// fix potential problem of passing in a single warning
$p2 = array($p2);
}
$this->cause = $p2;
} else {
$code = null;
$this->cause = null;
}
parent::__construct($message, $code);
$this->signal();
}
/**
* @param mixed $callback - A valid php callback, see php func is_callable()
* - A PEAR_Exception::OBSERVER_* constant
* - An array(const PEAR_Exception::OBSERVER_*,
* mixed $options)
* @param string $label The name of the observer. Use this if you want
* to remove it later with removeObserver()
*/
public static function addObserver($callback, $label = 'default')
{
self::$_observers[$label] = $callback;
}
public static function removeObserver($label = 'default')
{
unset(self::$_observers[$label]);
}
/**
* @return int unique identifier for an observer
*/
public static function getUniqueId()
{
return self::$_uniqueid++;
}
private function signal()
{
foreach (self::$_observers as $func) {
if (is_callable($func)) {
call_user_func($func, $this);
continue;
}
settype($func, 'array');
switch ($func[0]) {
case self::OBSERVER_PRINT :
$f = (isset($func[1])) ? $func[1] : '%s';
printf($f, $this->getMessage());
break;
case self::OBSERVER_TRIGGER :
$f = (isset($func[1])) ? $func[1] : E_USER_NOTICE;
trigger_error($this->getMessage(), $f);
break;
case self::OBSERVER_DIE :
$f = (isset($func[1])) ? $func[1] : '%s';
die(printf($f, $this->getMessage()));
break;
default:
trigger_error('invalid observer type', E_USER_WARNING);
}
}
}
/**
* Return specific error information that can be used for more detailed
* error messages or translation.
*
* This method may be overridden in child exception classes in order
* to add functionality not present in PEAR_Exception and is a placeholder
* to define API
*
* The returned array must be an associative array of parameter => value like so:
* <pre>
* array('name' => $name, 'context' => array(...))
* </pre>
* @return array
*/
public function getErrorData()
{
return array();
}
/**
* Returns the exception that caused this exception to be thrown
* @access public
* @return Exception|array The context of the exception
*/
public function getCause()
{
return $this->cause;
}
/**
* Function must be public to call on caused exceptions
* @param array
*/
public function getCauseMessage(&$causes)
{
$trace = $this->getTraceSafe();
$cause = array('class' => get_class($this),
'message' => $this->message,
'file' => 'unknown',
'line' => 'unknown');
if (isset($trace[0])) {
if (isset($trace[0]['file'])) {
$cause['file'] = $trace[0]['file'];
$cause['line'] = $trace[0]['line'];
}
}
if ($this->cause instanceof PEAR_Exception) {
$this->cause->getCauseMessage($causes);
}
if (is_array($this->cause)) {
foreach ($this->cause as $cause) {
if ($cause instanceof PEAR_Exception) {
$cause->getCauseMessage($causes);
} elseif (is_array($cause) && isset($cause['message'])) {
// PEAR_ErrorStack warning
$causes[] = array(
'class' => $cause['package'],
'message' => $cause['message'],
'file' => isset($cause['context']['file']) ?
$cause['context']['file'] :
'unknown',
'line' => isset($cause['context']['line']) ?
$cause['context']['line'] :
'unknown',
);
}
}
}
}
public function getTraceSafe()
{
if (!isset($this->_trace)) {
$this->_trace = $this->getTrace();
if (empty($this->_trace)) {
$backtrace = debug_backtrace();
$this->_trace = array($backtrace[count($backtrace)-1]);
}
}
return $this->_trace;
}
public function getErrorClass()
{
$trace = $this->getTraceSafe();
return $trace[0]['class'];
}
public function getErrorMethod()
{
$trace = $this->getTraceSafe();
return $trace[0]['function'];
}
public function __toString()
{
if (isset($_SERVER['REQUEST_URI'])) {
return $this->toHtml();
}
return $this->toText();
}
public function toHtml()
{
$trace = $this->getTraceSafe();
$causes = array();
$this->getCauseMessage($causes);
$html = '<table border="1" cellspacing="0">' . "\n";
foreach ($causes as $i => $cause) {
$html .= '<tr><td colspan="3" bgcolor="#ff9999">'
. str_repeat('-', $i) . ' <b>' . $cause['class'] . '</b>: '
. htmlspecialchars($cause['message']) . ' in <b>' . $cause['file'] . '</b> '
. 'on line <b>' . $cause['line'] . '</b>'
. "</td></tr>\n";
}
$html .= '<tr><td colspan="3" bgcolor="#aaaaaa" align="center"><b>Exception trace</b></td></tr>' . "\n"
. '<tr><td align="center" bgcolor="#cccccc" width="20"><b>#</b></td>'
. '<td align="center" bgcolor="#cccccc"><b>Function</b></td>'
. '<td align="center" bgcolor="#cccccc"><b>Location</b></td></tr>' . "\n";
foreach ($trace as $k => $v) {
$html .= '<tr><td align="center">' . $k . '</td>'
. '<td>';
if (!empty($v['class'])) {
$html .= $v['class'] . $v['type'];
}
$html .= $v['function'];
$args = array();
if (!empty($v['args'])) {
foreach ($v['args'] as $arg) {
if (is_null($arg)) $args[] = 'null';
elseif (is_array($arg)) $args[] = 'Array';
elseif (is_object($arg)) $args[] = 'Object('.get_class($arg).')';
elseif (is_bool($arg)) $args[] = $arg ? 'true' : 'false';
elseif (is_int($arg) || is_double($arg)) $args[] = $arg;
else {
$arg = (string)$arg;
$str = htmlspecialchars(substr($arg, 0, 16));
if (strlen($arg) > 16) $str .= '…';
$args[] = "'" . $str . "'";
}
}
}
$html .= '(' . implode(', ',$args) . ')'
. '</td>'
. '<td>' . $v['file'] . ':' . $v['line'] . '</td></tr>' . "\n";
}
$html .= '<tr><td align="center">' . ($k+1) . '</td>'
. '<td>{main}</td>'
. '<td> </td></tr>' . "\n"
. '</table>';
return $html;
}
public function toText()
{
$causes = array();
$this->getCauseMessage($causes);
$causeMsg = '';
foreach ($causes as $i => $cause) {
$causeMsg .= str_repeat(' ', $i) . $cause['class'] . ': '
. $cause['message'] . ' in ' . $cause['file']
. ' on line ' . $cause['line'] . "\n";
}
return $causeMsg . $this->getTraceAsString();
}
}
?>
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