ErrorStack.php

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<?php

$GLOBALS['_PEAR_ERRORSTACK_SINGLETON'] = array();

$GLOBALS['_PEAR_ERRORSTACK_DEFAULT_CALLBACK'] = array(
    '*' => false,
);

$GLOBALS['_PEAR_ERRORSTACK_DEFAULT_LOGGER'] = false;

$GLOBALS['_PEAR_ERRORSTACK_OVERRIDE_CALLBACK'] = array();

define('PEAR_ERRORSTACK_PUSHANDLOG', 1);
define('PEAR_ERRORSTACK_PUSH', 2);
define('PEAR_ERRORSTACK_LOG', 3);
define('PEAR_ERRORSTACK_IGNORE', 4);
define('PEAR_ERRORSTACK_DIE', 5);

define('PEAR_ERRORSTACK_ERR_NONCLASS', 1);

define('PEAR_ERRORSTACK_ERR_OBJTOSTRING', 2);
class PEAR_ErrorStack {
    var $_errors = array();

    var $_errorsByLevel = array();

    var $_package;
    
    var $_compat = false;
    
    var $_msgCallback = false;
    
    var $_contextCallback = false;

    var $_errorCallback = array();

    var $_logger = false;

    var $_errorMsgs = array();

    function __construct($package, $msgCallback = false, $contextCallback = false,
                         $throwPEAR_Error = false)
    {
        $this->_package = $package;
        $this->setMessageCallback($msgCallback);
        $this->setContextCallback($contextCallback);
        $this->_compat = $throwPEAR_Error;
    }
    
    public static function &singleton(
        $package, $msgCallback = false, $contextCallback = false,
        $throwPEAR_Error = false, $stackClass = 'PEAR_ErrorStack'
    ) {
        if (isset($GLOBALS['_PEAR_ERRORSTACK_SINGLETON'][$package])) {
            return $GLOBALS['_PEAR_ERRORSTACK_SINGLETON'][$package];
        }
        if (!class_exists($stackClass)) {
            if (function_exists('debug_backtrace')) {
                $trace = debug_backtrace();
            }
            PEAR_ErrorStack::staticPush('PEAR_ErrorStack', PEAR_ERRORSTACK_ERR_NONCLASS,
                'exception', array('stackclass' => $stackClass),
                'stack class "%stackclass%" is not a valid class name (should be like PEAR_ErrorStack)',
                false, $trace);
        }
        $GLOBALS['_PEAR_ERRORSTACK_SINGLETON'][$package] =
            new $stackClass($package, $msgCallback, $contextCallback, $throwPEAR_Error);
 
        return $GLOBALS['_PEAR_ERRORSTACK_SINGLETON'][$package];
    }

    function _handleError($err)
    {
        if ($err['level'] == 'exception') {
            $message = $err['message'];
            if (isset($_SERVER['REQUEST_URI'])) {
                echo '<br />';
            } else {
                echo "\n";
            }
            var_dump($err['context']);
            die($message);
        }
    }
    
    public static function setDefaultLogger(&$log)
    {
        if (is_object($log) && method_exists($log, 'log') ) {
            $GLOBALS['_PEAR_ERRORSTACK_DEFAULT_LOGGER'] = &$log;
        } elseif (is_callable($log)) {
            $GLOBALS['_PEAR_ERRORSTACK_DEFAULT_LOGGER'] = &$log;
        }
    }
    
    function setLogger(&$log)
    {
        if (is_object($log) && method_exists($log, 'log') ) {
            $this->_logger = &$log;
        } elseif (is_callable($log)) {
            $this->_logger = &$log;
        }
    }
    
    function setMessageCallback($msgCallback)
    {
        if (!$msgCallback) {
            $this->_msgCallback = array(&$this, 'getErrorMessage');
        } else {
            if (is_callable($msgCallback)) {
                $this->_msgCallback = $msgCallback;
            }
        }
    }
    
    function getMessageCallback()
    {
        return $this->_msgCallback;
    }
    
    public static function setDefaultCallback($callback = false, $package = false)
    {
        if (!is_callable($callback)) {
            $callback = false;
        }
        $package = $package ? $package : '*';
        $GLOBALS['_PEAR_ERRORSTACK_DEFAULT_CALLBACK'][$package] = $callback;
    }
    
    function setContextCallback($contextCallback)
    {
        if ($contextCallback === null) {
            return $this->_contextCallback = false;
        }
        if (!$contextCallback) {
            $this->_contextCallback = array(&$this, 'getFileLine');
        } else {
            if (is_callable($contextCallback)) {
                $this->_contextCallback = $contextCallback;
            }
        }
    }
    
    function pushCallback($cb)
    {
        array_push($this->_errorCallback, $cb);
    }
    
    function popCallback()
    {
        if (!count($this->_errorCallback)) {
            return false;
        }
        return array_pop($this->_errorCallback);
    }
    
    public static function staticPushCallback($cb)
    {
        array_push($GLOBALS['_PEAR_ERRORSTACK_OVERRIDE_CALLBACK'], $cb);
    }
    
    public static function staticPopCallback()
    {
        $ret = array_pop($GLOBALS['_PEAR_ERRORSTACK_OVERRIDE_CALLBACK']);
        if (!is_array($GLOBALS['_PEAR_ERRORSTACK_OVERRIDE_CALLBACK'])) {
            $GLOBALS['_PEAR_ERRORSTACK_OVERRIDE_CALLBACK'] = array();
        }
        return $ret;
    }
    
    function push($code, $level = 'error', $params = array(), $msg = false,
                  $repackage = false, $backtrace = false)
    {
        $context = false;
        // grab error context
        if ($this->_contextCallback) {
            if (!$backtrace) {
                $backtrace = debug_backtrace();
            }
            $context = call_user_func($this->_contextCallback, $code, $params, $backtrace);
        }
        
        // save error
        $time = explode(' ', microtime());
        $time = $time[1] + $time[0];
        $err = array(
                'code' => $code,
                'params' => $params,
                'package' => $this->_package,
                'level' => $level,
                'time' => $time,
                'context' => $context,
                'message' => $msg,
               );
 
        if ($repackage) {
            $err['repackage'] = $repackage;
        }
 
        // set up the error message, if necessary
        if ($this->_msgCallback) {
            $msg = call_user_func_array($this->_msgCallback,
                                        array(&$this, $err));
            $err['message'] = $msg;
        }        
        $push = $log = true;
        $die = false;
        // try the overriding callback first
        $callback = $this->staticPopCallback();
        if ($callback) {
            $this->staticPushCallback($callback);
        }
        if (!is_callable($callback)) {
            // try the local callback next
            $callback = $this->popCallback();
            if (is_callable($callback)) {
                $this->pushCallback($callback);
            } else {
                // try the default callback
                $callback = isset($GLOBALS['_PEAR_ERRORSTACK_DEFAULT_CALLBACK'][$this->_package]) ?
                    $GLOBALS['_PEAR_ERRORSTACK_DEFAULT_CALLBACK'][$this->_package] :
                    $GLOBALS['_PEAR_ERRORSTACK_DEFAULT_CALLBACK']['*'];
            }
        }
        if (is_callable($callback)) {
            switch(call_user_func($callback, $err)){
                case PEAR_ERRORSTACK_IGNORE: 
                    return $err;
                break;
                case PEAR_ERRORSTACK_PUSH: 
                    $log = false;
                break;
                case PEAR_ERRORSTACK_LOG: 
                    $push = false;
                break;
                case PEAR_ERRORSTACK_DIE: 
                    $die = true;
                break;
                // anything else returned has the same effect as pushandlog
            }
        }
        if ($push) {
            array_unshift($this->_errors, $err);
            if (!isset($this->_errorsByLevel[$err['level']])) {
                $this->_errorsByLevel[$err['level']] = array();
            }
            $this->_errorsByLevel[$err['level']][] = &$this->_errors[0];
        }
        if ($log) {
            if ($this->_logger || $GLOBALS['_PEAR_ERRORSTACK_DEFAULT_LOGGER']) {
                $this->_log($err);
            }
        }
        if ($die) {
            die();
        }
        if ($this->_compat && $push) {
            return $this->raiseError($msg, $code, null, null, $err);
        }
        return $err;
    }
    
    public static function staticPush(
        $package, $code, $level = 'error', $params = array(),
        $msg = false, $repackage = false, $backtrace = false
    ) {
        $s = &PEAR_ErrorStack::singleton($package);
        if ($s->_contextCallback) {
            if (!$backtrace) {
                if (function_exists('debug_backtrace')) {
                    $backtrace = debug_backtrace();
                }
            }
        }
        return $s->push($code, $level, $params, $msg, $repackage, $backtrace);
    }
    
    function _log($err)
    {
        if ($this->_logger) {
            $logger = &$this->_logger;
        } else {
            $logger = &$GLOBALS['_PEAR_ERRORSTACK_DEFAULT_LOGGER'];
        }
        if (is_a($logger, 'Log')) {
            $levels = array(
                'exception' => PEAR_LOG_CRIT,
                'alert' => PEAR_LOG_ALERT,
                'critical' => PEAR_LOG_CRIT,
                'error' => PEAR_LOG_ERR,
                'warning' => PEAR_LOG_WARNING,
                'notice' => PEAR_LOG_NOTICE,
                'info' => PEAR_LOG_INFO,
                'debug' => PEAR_LOG_DEBUG);
            if (isset($levels[$err['level']])) {
                $level = $levels[$err['level']];
            } else {
                $level = PEAR_LOG_INFO;
            }
            $logger->log($err['message'], $level, $err);
        } else { // support non-standard logs
            call_user_func($logger, $err);
        }
    }
 
    
    function pop()
    {
        $err = @array_shift($this->_errors);
        if (!is_null($err)) {
            @array_pop($this->_errorsByLevel[$err['level']]);
            if (!count($this->_errorsByLevel[$err['level']])) {
                unset($this->_errorsByLevel[$err['level']]);
            }
        }
        return $err;
    }

    static function staticPop($package)
    {
        if ($package) {
            if (!isset($GLOBALS['_PEAR_ERRORSTACK_SINGLETON'][$package])) {
                return false;
            }
            return $GLOBALS['_PEAR_ERRORSTACK_SINGLETON'][$package]->pop();
        }
    }

    function hasErrors($level = false)
    {
        if ($level) {
            return isset($this->_errorsByLevel[$level]);
        }
        return count($this->_errors);
    }
    
    function getErrors($purge = false, $level = false)
    {
        if (!$purge) {
            if ($level) {
                if (!isset($this->_errorsByLevel[$level])) {
                    return array();
                } else {
                    return $this->_errorsByLevel[$level];
                }
            } else {
                return $this->_errors;
            }
        }
        if ($level) {
            $ret = $this->_errorsByLevel[$level];
            foreach ($this->_errorsByLevel[$level] as $i => $unused) {
                // entries are references to the $_errors array
                $this->_errorsByLevel[$level][$i] = false;
            }
            // array_filter removes all entries === false
            $this->_errors = array_filter($this->_errors);
            unset($this->_errorsByLevel[$level]);
            return $ret;
        }
        $ret = $this->_errors;
        $this->_errors = array();
        $this->_errorsByLevel = array();
        return $ret;
    }
    
    public static function staticHasErrors($package = false, $level = false)
    {
        if ($package) {
            if (!isset($GLOBALS['_PEAR_ERRORSTACK_SINGLETON'][$package])) {
                return false;
            }
            return $GLOBALS['_PEAR_ERRORSTACK_SINGLETON'][$package]->hasErrors($level);
        }
        foreach ($GLOBALS['_PEAR_ERRORSTACK_SINGLETON'] as $package => $obj) {
            if ($obj->hasErrors($level)) {
                return true;
            }
        }
        return false;
    }
    
    public static function staticGetErrors(
        $purge = false, $level = false, $merge = false,
        $sortfunc = array('PEAR_ErrorStack', '_sortErrors')
    ) {
        $ret = array();
        if (!is_callable($sortfunc)) {
            $sortfunc = array('PEAR_ErrorStack', '_sortErrors');
        }
        foreach ($GLOBALS['_PEAR_ERRORSTACK_SINGLETON'] as $package => $obj) {
            $test = $GLOBALS['_PEAR_ERRORSTACK_SINGLETON'][$package]->getErrors($purge, $level);
            if ($test) {
                if ($merge) {
                    $ret = array_merge($ret, $test);
                } else {
                    $ret[$package] = $test;
                }
            }
        }
        if ($merge) {
            usort($ret, $sortfunc);
        }
        return $ret;
    }
    
    public static function _sortErrors($a, $b)
    {
        if ($a['time'] == $b['time']) {
            return 0;
        }
        if ($a['time'] < $b['time']) {
            return 1;
        }
        return -1;
    }

    public static function getFileLine($code, $params, $backtrace = null)
    {
        if ($backtrace === null) {
            return false;
        }
        $frame = 0;
        $functionframe = 1;
        if (!isset($backtrace[1])) {
            $functionframe = 0;
        } else {
            while (isset($backtrace[$functionframe]['function']) &&
                  $backtrace[$functionframe]['function'] == 'eval' &&
                  isset($backtrace[$functionframe + 1])) {
                $functionframe++;
            }
        }
        if (isset($backtrace[$frame])) {
            if (!isset($backtrace[$frame]['file'])) {
                $frame++;
            }
            $funcbacktrace = $backtrace[$functionframe];
            $filebacktrace = $backtrace[$frame];
            $ret = array('file' => $filebacktrace['file'],
                         'line' => $filebacktrace['line']);
            // rearrange for eval'd code or create function errors
            if (strpos($filebacktrace['file'], '(') && 
                  preg_match(';^(.*?)\‍((\d+)\‍) : (.*?)\\z;', $filebacktrace['file'],
                  $matches)) {
                $ret['file'] = $matches[1];
                $ret['line'] = $matches[2] + 0;
            }
            if (isset($funcbacktrace['function']) && isset($backtrace[1])) {
                if ($funcbacktrace['function'] != 'eval') {
                    if ($funcbacktrace['function'] == '__lambda_func') {
                        $ret['function'] = 'create_function() code';
                    } else {
                        $ret['function'] = $funcbacktrace['function'];
                    }
                }
            }
            if (isset($funcbacktrace['class']) && isset($backtrace[1])) {
                $ret['class'] = $funcbacktrace['class'];
            }
            return $ret;
        }
        return false;
    }
    
    public static function getErrorMessage(&$stack, $err, $template = false)
    {
        if ($template) {
            $mainmsg = $template;
        } else {
            $mainmsg = $stack->getErrorMessageTemplate($err['code']);
        }
        $mainmsg = str_replace('%__msg%', $err['message'], $mainmsg);
        if (is_array($err['params']) && count($err['params'])) {
            foreach ($err['params'] as $name => $val) {
                if (is_array($val)) {
                    // @ is needed in case $val is a multi-dimensional array
                    $val = @implode(', ', $val);
                }
                if (is_object($val)) {
                    if (method_exists($val, '__toString')) {
                        $val = $val->__toString();
                    } else {
                        PEAR_ErrorStack::staticPush('PEAR_ErrorStack', PEAR_ERRORSTACK_ERR_OBJTOSTRING,
                            'warning', array('obj' => get_class($val)),
                            'object %obj% passed into getErrorMessage, but has no __toString() method');
                        $val = 'Object';
                    }
                }
                $mainmsg = str_replace('%' . $name . '%', $val, $mainmsg);
            }
        }
        return $mainmsg;
    }
    
    function getErrorMessageTemplate($code)
    {
        if (!isset($this->_errorMsgs[$code])) {
            return '%__msg%';
        }
        return $this->_errorMsgs[$code];
    }
    
    function setErrorMessageTemplate($template)
    {
        $this->_errorMsgs = $template;
    }
    
    
    function raiseError()
    {
        require_once 'PEAR.php';
        $args = func_get_args();
        return call_user_func_array(array('PEAR', 'raiseError'), $args);
    }
}
$stack = &PEAR_ErrorStack::singleton('PEAR_ErrorStack');
$stack->pushCallback(array('PEAR_ErrorStack', '_handleError'));
?>