<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2012 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: luofei614 <weibo.com/luofei614>
// +----------------------------------------------------------------------
// $Id$

/**
 * 将Trace信息输出到火狐的firebug，从而不影响ajax效果和页面的布局。
 * 使用前，你需要先在火狐浏览器上安装firebug和firePHP两个插件。
 * 定义应用的tags.php文件，
 * <code>
 * <?php return array(
 *   'app_end'=>array(
 *       'FireShowPageTrace'
 *   )
 * );
 * </code>
 * 再将此文件放到应用的Behavior文件夹中即可
 * 如果trace信息没有正常输出，请查看您的日志。
 * firePHP，是通过http headers和firebug通讯的，所以要保证在输出trace信息之前不能有
 * headers输出，你可以在入口文件第一行加入代码 ob_start(); 或者配置output_buffering
 *
 */
namespace Behavior;

/**
 * 系统行为扩展 页面Trace显示输出
 */
use Behavior\FirePHP as FirePHP;
use Think\Exception as Exception;
class FireShowPageTraceBehavior
{
    protected $tracePagTabs = array('BASE' => '基本', 'FILE' => '文件', 'INFO' => '流程', 'ERR|NOTIC' => '错误', 'SQL' => 'SQL', 'DEBUG' => '调试');

    // 行为扩展的执行入口必须是run
    public function run(&$params)
    {
        if (C('FIRE_SHOW_PAGE_TRACE', null, true)) {
            $this->showTrace();
        }

    }

    /**
     * 显示页面Trace信息
     * @access private
     */
    private function showTrace()
    {
        // 系统默认显示信息
        $files = get_included_files();
        $info  = array();
        foreach ($files as $key => $file) {
            $info[] = $file . ' ( ' . number_format(filesize($file) / 1024, 2) . ' KB )';
        }
        $trace = array();
        $base  = array(
            '请求信息' => date('Y-m-d H:i:s', $_SERVER['REQUEST_TIME']) . ' ' . $_SERVER['SERVER_PROTOCOL'] . ' ' . $_SERVER['REQUEST_METHOD'] . ' : ' . __SELF__,
            '运行时间' => $this->showTime(),
            '内存开销' => MEMORY_LIMIT_ON ? number_format((memory_get_usage() - $GLOBALS['_startUseMems']) / 1024, 2) . ' kb' : '不支持',
            '查询信息' => N('db_query') . ' queries ' . N('db_write') . ' writes ',
            '文件加载' => count(get_included_files()),
            '缓存信息' => N('cache_read') . ' gets ' . N('cache_write') . ' writes ',
            '配置加载' => count(c()),
            '会话信息' => 'SESSION_ID=' . session_id(),
        );
        // 读取应用定义的Trace文件
        $traceFile = CONF_PATH . 'trace.php';
        if (is_file($traceFile)) {
            $base = array_merge($base, include $traceFile);
        }
        $debug = trace();
        $tabs  = C('TRACE_PAGE_TABS', null, $this->tracePagTabs);
        foreach ($tabs as $name => $title) {
            switch (strtoupper($name)) {
                case 'BASE': // 基本信息
                    $trace[$title] = $base;
                    break;
                case 'FILE': // 文件信息
                    $trace[$title] = $info;
                    break;
                default: // 调试信息
                    if (strpos($name, '|')) {
// 多组信息
                        $array  = explode('|', $name);
                        $result = array();
                        foreach ($array as $name) {
                            $result += isset($debug[$name]) ? $debug[$name] : array();
                        }
                        $trace[$title] = $result;
                    } else {
                        $trace[$title] = isset($debug[$name]) ? $debug[$name] : '';
                    }
            }
        }
        foreach ($trace as $key => $val) {
            if (!is_array($val) && empty($val)) {
                $val = array();
            }

            if (is_array($val)) {
                $fire = array(
                    array('', ''),
                );
                foreach ($val as $k => $v) {
                    $fire[] = array($k, $v);
                }
                fb(array($key, $fire), FirePHP::TABLE);
            } else {
                fb($val, $key);
            }
        }
        unset($files, $info, $log, $base);
    }

    /**
     * 获取运行时间
     */
    private function showTime()
    {
        // 显示运行时间
        G('beginTime', $GLOBALS['_beginTime']);
        G('viewEndTime');
        // 显示详细运行时间
        return G('beginTime', 'viewEndTime') . 's ( Load:' . G('beginTime', 'loadTime') . 's Init:' . G('loadTime', 'initTime') . 's Exec:' . G('initTime', 'viewStartTime') . 's Template:' . G('viewStartTime', 'viewEndTime') . 's )';
    }

}

function fb()
{
    $instance = FirePHP::getInstance(true);

    $args = func_get_args();
    return call_user_func_array(array($instance, 'fb'), $args);
}

class FB
{
    /**
     * Enable and disable logging to Firebug
     *
     * @see FirePHP->setEnabled()
     * @param boolean $Enabled TRUE to enable, FALSE to disable
     * @return void
     */
    public static function setEnabled($Enabled)
    {
        $instance = FirePHP::getInstance(true);
        $instance->setEnabled($Enabled);
    }

    /**
     * Check if logging is enabled
     *
     * @see FirePHP->getEnabled()
     * @return boolean TRUE if enabled
     */
    public static function getEnabled()
    {
        $instance = FirePHP::getInstance(true);
        return $instance->getEnabled();
    }

    /**
     * Specify a filter to be used when encoding an object
     *
     * Filters are used to exclude object members.
     *
     * @see FirePHP->setObjectFilter()
     * @param string $Class The class name of the object
     * @param array $Filter An array or members to exclude
     * @return void
     */
    public static function setObjectFilter($Class, $Filter)
    {
        $instance = FirePHP::getInstance(true);
        $instance->setObjectFilter($Class, $Filter);
    }

    /**
     * Set some options for the library
     *
     * @see FirePHP->setOptions()
     * @param array $Options The options to be set
     * @return void
     */
    public static function setOptions($Options)
    {
        $instance = FirePHP::getInstance(true);
        $instance->setOptions($Options);
    }

    /**
     * Get options for the library
     *
     * @see FirePHP->getOptions()
     * @return array The options
     */
    public static function getOptions()
    {
        $instance = FirePHP::getInstance(true);
        return $instance->getOptions();
    }

    /**
     * Log object to firebug
     *
     * @see http://www.firephp.org/Wiki/Reference/Fb
     * @param mixed $Object
     * @return true
     * @throws Exception
     */
    public static function send()
    {
        $instance = FirePHP::getInstance(true);
        $args     = func_get_args();
        return call_user_func_array(array($instance, 'fb'), $args);
    }

    /**
     * Start a group for following messages
     *
     * Options:
     *   Collapsed: [true|false]
     *   Color:     [#RRGGBB|ColorName]
     *
     * @param string $Name
     * @param array $Options OPTIONAL Instructions on how to log the group
     * @return true
     */
    public static function group($Name, $Options = null)
    {
        $instance = FirePHP::getInstance(true);
        return $instance->group($Name, $Options);
    }

    /**
     * Ends a group you have started before
     *
     * @return true
     * @throws Exception
     */
    public static function groupEnd()
    {
        return self::send(null, null, FirePHP::GROUP_END);
    }

    /**
     * Log object with label to firebug console
     *
     * @see FirePHP::LOG
     * @param mixes $Object
     * @param string $Label
     * @return true
     * @throws Exception
     */
    public static function log($Object, $Label = null)
    {
        return self::send($Object, $Label, FirePHP::LOG);
    }

    /**
     * Log object with label to firebug console
     *
     * @see FirePHP::INFO
     * @param mixes $Object
     * @param string $Label
     * @return true
     * @throws Exception
     */
    public static function info($Object, $Label = null)
    {
        return self::send($Object, $Label, FirePHP::INFO);
    }

    /**
     * Log object with label to firebug console
     *
     * @see FirePHP::WARN
     * @param mixes $Object
     * @param string $Label
     * @return true
     * @throws Exception
     */
    public static function warn($Object, $Label = null)
    {
        return self::send($Object, $Label, FirePHP::WARN);
    }

    /**
     * Log object with label to firebug console
     *
     * @see FirePHP::ERROR
     * @param mixes $Object
     * @param string $Label
     * @return true
     * @throws Exception
     */
    public static function error($Object, $Label = null)
    {
        return self::send($Object, $Label, FirePHP::ERROR);
    }

    /**
     * Dumps key and variable to firebug server panel
     *
     * @see FirePHP::DUMP
     * @param string $Key
     * @param mixed $Variable
     * @return true
     * @throws Exception
     */
    public static function dump($Key, $Variable)
    {
        return self::send($Variable, $Key, FirePHP::DUMP);
    }

    /**
     * Log a trace in the firebug console
     *
     * @see FirePHP::TRACE
     * @param string $Label
     * @return true
     * @throws Exception
     */
    public static function trace($Label)
    {
        return self::send($Label, FirePHP::TRACE);
    }

    /**
     * Log a table in the firebug console
     *
     * @see FirePHP::TABLE
     * @param string $Label
     * @param string $Table
     * @return true
     * @throws Exception
     */
    public static function table($Label, $Table)
    {
        return self::send($Table, $Label, FirePHP::TABLE);
    }

}

if (!defined('E_STRICT')) {
    define('E_STRICT', 2048);
}
if (!defined('E_RECOVERABLE_ERROR')) {
    define('E_RECOVERABLE_ERROR', 4096);
}
if (!defined('E_DEPRECATED')) {
    define('E_DEPRECATED', 8192);
}
if (!defined('E_USER_DEPRECATED')) {
    define('E_USER_DEPRECATED', 16384);
}

/**
 * Sends the given data to the FirePHP Firefox Extension.
 * The data can be displayed in the Firebug Console or in the
 * "Server" request tab.
 *
 * For more information see: http://www.firephp.org/
 *
 * @copyright       Copyright (C) 2007-2009 Christoph Dorn
 * @author          Christoph Dorn <christoph@christophdorn.com>
 * @license         http://www.opensource.org/licenses/bsd-license.php
 * @package         FirePHPCore
 */
class FirePHP
{

    /**
     * FirePHP version
     *
     * @var string
     */
    const VERSION = '0.3'; // @pinf replace '0.3' with '%%package.version%%'

    /**
     * Firebug LOG level
     *
     * Logs a message to firebug console.
     *
     * @var string
     */
    const LOG = 'LOG';

    /**
     * Firebug INFO level
     *
     * Logs a message to firebug console and displays an info icon before the message.
     *
     * @var string
     */
    const INFO = 'INFO';

    /**
     * Firebug WARN level
     *
     * Logs a message to firebug console, displays an warning icon before the message and colors the line turquoise.
     *
     * @var string
     */
    const WARN = 'WARN';

    /**
     * Firebug ERROR level
     *
     * Logs a message to firebug console, displays an error icon before the message and colors the line yellow. Also increments the firebug error count.
     *
     * @var string
     */
    const ERROR = 'ERROR';

    /**
     * Dumps a variable to firebug's server panel
     *
     * @var string
     */
    const DUMP = 'DUMP';

    /**
     * Displays a stack trace in firebug console
     *
     * @var string
     */
    const TRACE = 'TRACE';

    /**
     * Displays an exception in firebug console
     *
     * Increments the firebug error count.
     *
     * @var string
     */
    const EXCEPTION = 'EXCEPTION';

    /**
     * Displays an table in firebug console
     *
     * @var string
     */
    const TABLE = 'TABLE';

    /**
     * Starts a group in firebug console
     *
     * @var string
     */
    const GROUP_START = 'GROUP_START';

    /**
     * Ends a group in firebug console
     *
     * @var string
     */
    const GROUP_END = 'GROUP_END';

    /**
     * Singleton instance of FirePHP
     *
     * @var FirePHP
     */
    protected static $instance = null;

    /**
     * Flag whether we are logging from within the exception handler
     *
     * @var boolean
     */
    protected $inExceptionHandler = false;

    /**
     * Flag whether to throw PHP errors that have been converted to ErrorExceptions
     *
     * @var boolean
     */
    protected $throwErrorExceptions = true;

    /**
     * Flag whether to convert PHP assertion errors to Exceptions
     *
     * @var boolean
     */
    protected $convertAssertionErrorsToExceptions = true;

    /**
     * Flag whether to throw PHP assertion errors that have been converted to Exceptions
     *
     * @var boolean
     */
    protected $throwAssertionExceptions = false;

    /**
     * Wildfire protocol message index
     *
     * @var int
     */
    protected $messageIndex = 1;

    /**
     * Options for the library
     *
     * @var array
     */
    protected $options = array('maxDepth' => 10,
        'maxObjectDepth'                      => 5,
        'maxArrayDepth'                       => 5,
        'useNativeJsonEncode'                 => true,
        'includeLineNumbers'                  => true);

    /**
     * Filters used to exclude object members when encoding
     *
     * @var array
     */
    protected $objectFilters = array(
        'firephp'            => array('objectStack', 'instance', 'json_objectStack'),
        'firephp_test_class' => array('objectStack', 'instance', 'json_objectStack'),
    );

    /**
     * A stack of objects used to detect recursion during object encoding
     *
     * @var object
     */
    protected $objectStack = array();

    /**
     * Flag to enable/disable logging
     *
     * @var boolean
     */
    protected $enabled = true;

    /**
     * The insight console to log to if applicable
     *
     * @var object
     */
    protected $logToInsightConsole = null;

    /**
     * When the object gets serialized only include specific object members.
     *
     * @return array
     */
    public function __sleep()
    {
        return array('options', 'objectFilters', 'enabled');
    }

    /**
     * Gets singleton instance of FirePHP
     *
     * @param boolean $AutoCreate
     * @return FirePHP
     */
    public static function getInstance($AutoCreate = false)
    {
        if (true === $AutoCreate && !self::$instance) {
            self::init();
        }
        return self::$instance;
    }

    /**
     * Creates FirePHP object and stores it for singleton access
     *
     * @return FirePHP
     */
    public static function init()
    {
        return self::setInstance(new self());
    }

    /**
     * Set the instance of the FirePHP singleton
     *
     * @param FirePHP $instance The FirePHP object instance
     * @return FirePHP
     */
    public static function setInstance($instance)
    {
        return self::$instance = $instance;
    }

    /**
     * Set an Insight console to direct all logging calls to
     *
     * @param object $console The console object to log to
     * @return void
     */
    public function setLogToInsightConsole($console)
    {
        if (is_string($console)) {
            if (get_class($this) != 'FirePHP_Insight' && !is_subclass_of($this, 'FirePHP_Insight')) {
                throw new Exception('FirePHP instance not an instance or subclass of FirePHP_Insight!');
            }
            $this->logToInsightConsole = $this->to('request')->console($console);
        } else {
            $this->logToInsightConsole = $console;
        }
    }

    /**
     * Enable and disable logging to Firebug
     *
     * @param boolean $Enabled TRUE to enable, FALSE to disable
     * @return void
     */
    public function setEnabled($Enabled)
    {
        $this->enabled = $Enabled;
    }

    /**
     * Check if logging is enabled
     *
     * @return boolean TRUE if enabled
     */
    public function getEnabled()
    {
        return $this->enabled;
    }

    /**
     * Specify a filter to be used when encoding an object
     *
     * Filters are used to exclude object members.
     *
     * @param string $Class The class name of the object
     * @param array $Filter An array of members to exclude
     * @return void
     */
    public function setObjectFilter($Class, $Filter)
    {
        $this->objectFilters[strtolower($Class)] = $Filter;
    }

    /**
     * Set some options for the library
     *
     * Options:
     *  - maxDepth: The maximum depth to traverse (default: 10)
     *  - maxObjectDepth: The maximum depth to traverse objects (default: 5)
     *  - maxArrayDepth: The maximum depth to traverse arrays (default: 5)
     *  - useNativeJsonEncode: If true will use json_encode() (default: true)
     *  - includeLineNumbers: If true will include line numbers and filenames (default: true)
     *
     * @param array $Options The options to be set
     * @return void
     */
    public function setOptions($Options)
    {
        $this->options = array_merge($this->options, $Options);
    }

    /**
     * Get options from the library
     *
     * @return array The currently set options
     */
    public function getOptions()
    {
        return $this->options;
    }

    /**
     * Set an option for the library
     *
     * @param string $Name
     * @param mixed $Value
     * @throws Exception
     * @return void
     */
    public function setOption($Name, $Value)
    {
        if (!isset($this->options[$Name])) {
            throw $this->newException('Unknown option: ' . $Name);
        }
        $this->options[$Name] = $Value;
    }

    /**
     * Get an option from the library
     *
     * @param string $Name
     * @throws Exception
     * @return mixed
     */
    public function getOption($Name)
    {
        if (!isset($this->options[$Name])) {
            throw $this->newException('Unknown option: ' . $Name);
        }
        return $this->options[$Name];
    }

    /**
     * Register FirePHP as your error handler
     *
     * Will throw exceptions for each php error.
     *
     * @return mixed Returns a string containing the previously defined error handler (if any)
     */
    public function registerErrorHandler($throwErrorExceptions = false)
    {
        //NOTE: The following errors will not be caught by this error handler:
        //      E_ERROR, E_PARSE, E_CORE_ERROR,
        //      E_CORE_WARNING, E_COMPILE_ERROR,
        //      E_COMPILE_WARNING, E_STRICT

        $this->throwErrorExceptions = $throwErrorExceptions;

        return set_error_handler(array($this, 'errorHandler'));
    }

    /**
     * FirePHP's error handler
     *
     * Throws exception for each php error that will occur.
     *
     * @param int $errno
     * @param string $errstr
     * @param string $errfile
     * @param int $errline
     * @param array $errcontext
     */
    public function errorHandler($errno, $errstr, $errfile, $errline, $errcontext)
    {
        // Don't throw exception if error reporting is switched off
        if (error_reporting() == 0) {
            return;
        }
        // Only throw exceptions for errors we are asking for
        if (error_reporting() & $errno) {

            $exception = new ErrorException($errstr, 0, $errno, $errfile, $errline);
            if ($this->throwErrorExceptions) {
                throw $exception;
            } else {
                $this->fb($exception);
            }
        }
    }

    /**
     * Register FirePHP as your exception handler
     *
     * @return mixed Returns the name of the previously defined exception handler,
     *               or NULL on error.
     *               If no previous handler was defined, NULL is also returned.
     */
    public function registerExceptionHandler()
    {
        return set_exception_handler(array($this, 'exceptionHandler'));
    }

    /**
     * FirePHP's exception handler
     *
     * Logs all exceptions to your firebug console and then stops the script.
     *
     * @param Exception $Exception
     * @throws Exception
     */
    public function exceptionHandler($Exception)
    {

        $this->inExceptionHandler = true;

        header('HTTP/1.1 500 Internal Server Error');

        try {
            $this->fb($Exception);
        } catch (Exception $e) {
            echo 'We had an exception: ' . $e;
        }
        $this->inExceptionHandler = false;
    }

    /**
     * Register FirePHP driver as your assert callback
     *
     * @param boolean $convertAssertionErrorsToExceptions
     * @param boolean $throwAssertionExceptions
     * @return mixed Returns the original setting or FALSE on errors
     */
    public function registerAssertionHandler($convertAssertionErrorsToExceptions = true, $throwAssertionExceptions = false)
    {
        $this->convertAssertionErrorsToExceptions = $convertAssertionErrorsToExceptions;
        $this->throwAssertionExceptions           = $throwAssertionExceptions;

        if ($throwAssertionExceptions && !$convertAssertionErrorsToExceptions) {
            throw $this->newException('Cannot throw assertion exceptions as assertion errors are not being converted to exceptions!');
        }

        return assert_options(ASSERT_CALLBACK, array($this, 'assertionHandler'));
    }

    /**
     * FirePHP's assertion handler
     *
     * Logs all assertions to your firebug console and then stops the script.
     *
     * @param string $file File source of assertion
     * @param int    $line Line source of assertion
     * @param mixed  $code Assertion code
     */
    public function assertionHandler($file, $line, $code)
    {
        if ($this->convertAssertionErrorsToExceptions) {

            $exception = new ErrorException('Assertion Failed - Code[ ' . $code . ' ]', 0, null, $file, $line);

            if ($this->throwAssertionExceptions) {
                throw $exception;
            } else {
                $this->fb($exception);
            }

        } else {
            $this->fb($code, 'Assertion Failed', FirePHP::ERROR, array('File' => $file, 'Line' => $line));
        }
    }

    /**
     * Start a group for following messages.
     *
     * Options:
     *   Collapsed: [true|false]
     *   Color:     [#RRGGBB|ColorName]
     *
     * @param string $Name
     * @param array $Options OPTIONAL Instructions on how to log the group
     * @return true
     * @throws Exception
     */
    public function group($Name, $Options = null)
    {

        if (!$Name) {
            throw $this->newException('You must specify a label for the group!');
        }

        if ($Options) {
            if (!is_array($Options)) {
                throw $this->newException('Options must be defined as an array!');
            }
            if (array_key_exists('Collapsed', $Options)) {
                $Options['Collapsed'] = ($Options['Collapsed']) ? 'true' : 'false';
            }
        }

        return $this->fb(null, $Name, FirePHP::GROUP_START, $Options);
    }

    /**
     * Ends a group you have started before
     *
     * @return true
     * @throws Exception
     */
    public function groupEnd()
    {
        return $this->fb(null, null, FirePHP::GROUP_END);
    }

    /**
     * Log object with label to firebug console
     *
     * @see FirePHP::LOG
     * @param mixes $Object
     * @param string $Label
     * @return true
     * @throws Exception
     */
    public function log($Object, $Label = null, $Options = array())
    {
        return $this->fb($Object, $Label, FirePHP::LOG, $Options);
    }

    /**
     * Log object with label to firebug console
     *
     * @see FirePHP::INFO
     * @param mixes $Object
     * @param string $Label
     * @return true
     * @throws Exception
     */
    public function info($Object, $Label = null, $Options = array())
    {
        return $this->fb($Object, $Label, FirePHP::INFO, $Options);
    }

    /**
     * Log object with label to firebug console
     *
     * @see FirePHP::WARN
     * @param mixes $Object
     * @param string $Label
     * @return true
     * @throws Exception
     */
    public function warn($Object, $Label = null, $Options = array())
    {
        return $this->fb($Object, $Label, FirePHP::WARN, $Options);
    }

    /**
     * Log object with label to firebug console
     *
     * @see FirePHP::ERROR
     * @param mixes $Object
     * @param string $Label
     * @return true
     * @throws Exception
     */
    public function error($Object, $Label = null, $Options = array())
    {
        return $this->fb($Object, $Label, FirePHP::ERROR, $Options);
    }

    /**
     * Dumps key and variable to firebug server panel
     *
     * @see FirePHP::DUMP
     * @param string $Key
     * @param mixed $Variable
     * @return true
     * @throws Exception
     */
    public function dump($Key, $Variable, $Options = array())
    {
        if (!is_string($Key)) {
            throw $this->newException('Key passed to dump() is not a string');
        }
        if (strlen($Key) > 100) {
            throw $this->newException('Key passed to dump() is longer than 100 characters');
        }
        if (!preg_match_all('/^[a-zA-Z0-9-_\.:]*$/', $Key, $m)) {
            throw $this->newException('Key passed to dump() contains invalid characters [a-zA-Z0-9-_\.:]');
        }
        return $this->fb($Variable, $Key, FirePHP::DUMP, $Options);
    }

    /**
     * Log a trace in the firebug console
     *
     * @see FirePHP::TRACE
     * @param string $Label
     * @return true
     * @throws Exception
     */
    public function trace($Label)
    {
        return $this->fb($Label, FirePHP::TRACE);
    }

    /**
     * Log a table in the firebug console
     *
     * @see FirePHP::TABLE
     * @param string $Label
     * @param string $Table
     * @return true
     * @throws Exception
     */
    public function table($Label, $Table, $Options = array())
    {
        return $this->fb($Table, $Label, FirePHP::TABLE, $Options);
    }

    /**
     * Insight API wrapper
     *
     * @see Insight_Helper::to()
     */
    public static function to()
    {
        $instance = self::getInstance();
        if (!method_exists($instance, "_to")) {
            throw new Exception("FirePHP::to() implementation not loaded");
        }
        $args = func_get_args();
        return call_user_func_array(array($instance, '_to'), $args);
    }

    /**
     * Insight API wrapper
     *
     * @see Insight_Helper::plugin()
     */
    public static function plugin()
    {
        $instance = self::getInstance();
        if (!method_exists($instance, "_plugin")) {
            throw new Exception("FirePHP::plugin() implementation not loaded");
        }
        $args = func_get_args();
        return call_user_func_array(array($instance, '_plugin'), $args);
    }

    /**
     * Check if FirePHP is installed on client
     *
     * @return boolean
     */
    public function detectClientExtension()
    {
        // Check if FirePHP is installed on client via User-Agent header
        if (@preg_match_all('/\sFirePHP\/([\.\d]*)\s?/si', $this->getUserAgent(), $m) &&
            version_compare($m[1][0], '0.0.6', '>=')) {
            return true;
        } else
        // Check if FirePHP is installed on client via X-FirePHP-Version header
        if (@preg_match_all('/^([\.\d]*)$/si', $this->getRequestHeader("X-FirePHP-Version"), $m) &&
            version_compare($m[1][0], '0.0.6', '>=')) {
            return true;
        }
        return false;
    }

    /**
     * Log varible to Firebug
     *
     * @see http://www.firephp.org/Wiki/Reference/Fb
     * @param mixed $Object The variable to be logged
     * @return true Return TRUE if message was added to headers, FALSE otherwise
     * @throws Exception
     */
    public function fb($Object)
    {
        if ($this instanceof FirePHP_Insight && method_exists($this, '_logUpgradeClientMessage')) {
            if (!FirePHP_Insight::$upgradeClientMessageLogged) {
                // avoid infinite recursion as _logUpgradeClientMessage() logs a message
                $this->_logUpgradeClientMessage();
            }
        }

        static $insightGroupStack = array();

        if (!$this->getEnabled()) {
            return false;
        }

        if ($this->headersSent($filename, $linenum)) {
            // If we are logging from within the exception handler we cannot throw another exception
            if ($this->inExceptionHandler) {
                // Simply echo the error out to the page
                echo '<div style="border: 2px solid red; font-family: Arial; font-size: 12px; background-color: lightgray; padding: 5px;"><span style="color: red; font-weight: bold;">FirePHP ERROR:</span> Headers already sent in <b>' . $filename . '</b> on line <b>' . $linenum . '</b>. Cannot send log data to FirePHP. You must have Output Buffering enabled via ob_start() or output_buffering ini directive.</div>';
            } else {
                throw $this->newException('Headers already sent in ' . $filename . ' on line ' . $linenum . '. Cannot send log data to FirePHP. You must have Output Buffering enabled via ob_start() or output_buffering ini directive.');
            }
        }

        $Type    = null;
        $Label   = null;
        $Options = array();

        if (func_num_args() == 1) {
        } else
        if (func_num_args() == 2) {
            switch (func_get_arg(1)) {
                case self::LOG:
                case self::INFO:
                case self::WARN:
                case self::ERROR:
                case self::DUMP:
                case self::TRACE:
                case self::EXCEPTION:
                case self::TABLE:
                case self::GROUP_START:
                case self::GROUP_END:
                    $Type = func_get_arg(1);
                    break;
                default:
                    $Label = func_get_arg(1);
                    break;
            }
        } else
        if (func_num_args() == 3) {
            $Type  = func_get_arg(2);
            $Label = func_get_arg(1);
        } else
        if (func_num_args() == 4) {
            $Type    = func_get_arg(2);
            $Label   = func_get_arg(1);
            $Options = func_get_arg(3);
        } else {
            throw $this->newException('Wrong number of arguments to fb() function!');
        }

        if (null !== $this->logToInsightConsole && (get_class($this) == 'FirePHP_Insight' || is_subclass_of($this, 'FirePHP_Insight'))) {
            $msg = $this->logToInsightConsole;
            if ($Object instanceof Exception) {
                $Type = self::EXCEPTION;
            }
            if ($Label && self::TABLE != $Type && self::GROUP_START != $Type) {
                $msg = $msg->label($Label);
            }
            switch ($Type) {
                case self::DUMP:
                case self::LOG:
                    return $msg->log($Object);
                case self::INFO:
                    return $msg->info($Object);
                case self::WARN:
                    return $msg->warn($Object);
                case self::ERROR:
                    return $msg->error($Object);
                case self::TRACE:
                    return $msg->trace($Object);
                case self::EXCEPTION:
                    return $this->plugin('engine')->handleException($Object, $msg);
                case self::TABLE:
                    if (isset($Object[0]) && !is_string($Object[0]) && $Label) {
                        $Object = array($Label, $Object);
                    }
                    return $msg->table($Object[0], array_slice($Object[1], 1), $Object[1][0]);
                case self::GROUP_START:
                    $insightGroupStack[] = $msg->group(md5($Label))->open();
                    return $msg->log($Label);
                case self::GROUP_END:
                    if (count($insightGroupStack) == 0) {
                        throw new Error('Too many groupEnd() as opposed to group() calls!');
                    }
                    $group = array_pop($insightGroupStack);
                    return $group->close();
                default:
                    return $msg->log($Object);
            }
        }

        if (!$this->detectClientExtension()) {
            return false;
        }

        $meta                  = array();
        $skipFinalObjectEncode = false;

        if ($Object instanceof Exception) {

            $meta['file'] = $this->_escapeTraceFile($Object->getFile());
            $meta['line'] = $Object->getLine();

            $trace = $Object->getTrace();
            if ($Object instanceof ErrorException
                && isset($trace[0]['function'])
                && 'errorHandler' == $trace[0]['function'] && isset($trace[0]['class'])
                && 'FirePHP' == $trace[0]['class']) {

                $severity = false;
                switch ($Object->getSeverity()) {
                    case E_WARNING:$severity = 'E_WARNING';
                        break;
                    case E_NOTICE:$severity = 'E_NOTICE';
                        break;
                    case E_USER_ERROR:$severity = 'E_USER_ERROR';
                        break;
                    case E_USER_WARNING:$severity = 'E_USER_WARNING';
                        break;
                    case E_USER_NOTICE:$severity = 'E_USER_NOTICE';
                        break;
                    case E_STRICT:$severity = 'E_STRICT';
                        break;
                    case E_RECOVERABLE_ERROR:$severity = 'E_RECOVERABLE_ERROR';
                        break;
                    case E_DEPRECATED:$severity = 'E_DEPRECATED';
                        break;
                    case E_USER_DEPRECATED:$severity = 'E_USER_DEPRECATED';
                        break;
                }

                $Object = array('Class' => get_class($Object),
                    'Message'               => $severity . ': ' . $Object->getMessage(),
                    'File'                  => $this->_escapeTraceFile($Object->getFile()),
                    'Line'                  => $Object->getLine(),
                    'Type'                  => 'trigger',
                    'Trace'                 => $this->_escapeTrace(array_splice($trace, 2)));
                $skipFinalObjectEncode = true;
            } else {
                $Object = array('Class' => get_class($Object),
                    'Message'               => $Object->getMessage(),
                    'File'                  => $this->_escapeTraceFile($Object->getFile()),
                    'Line'                  => $Object->getLine(),
                    'Type'                  => 'throw',
                    'Trace'                 => $this->_escapeTrace($trace));
                $skipFinalObjectEncode = true;
            }
            $Type = self::EXCEPTION;

        } else
        if (self::TRACE == $Type) {

            $trace = debug_backtrace();
            if (!$trace) {
                return false;
            }

            for ($i = 0; $i < sizeof($trace); $i++) {

                if (isset($trace[$i]['class'])
                    && isset($trace[$i]['file'])
                    && ('FirePHP' == $trace[$i]['class'] || 'FB' == $trace[$i]['class'])
                    && (substr($this->_standardizePath($trace[$i]['file']), -18, 18) == 'FirePHPCore/fb.php'
                        || substr($this->_standardizePath($trace[$i]['file']), -29, 29) == 'FirePHPCore/FirePHP.class.php')) {
                    /* Skip - FB::trace(), FB::send(), $firephp->trace(), $firephp->fb() */
                } else
                if (isset($trace[$i]['class'])
                    && isset($trace[$i + 1]['file'])
                    && 'FirePHP' == $trace[$i]['class'] && substr($this->_standardizePath($trace[$i + 1]['file']), -18, 18) == 'FirePHPCore/fb.php') {
                    /* Skip fb() */
                } else
                if ('fb' == $trace[$i]['function'] || 'trace' == $trace[$i]['function'] || 'send' == $trace[$i]['function']) {

                    $Object = array('Class' => isset($trace[$i]['class']) ? $trace[$i]['class'] : '',
                        'Type'                  => isset($trace[$i]['type']) ? $trace[$i]['type'] : '',
                        'Function'              => isset($trace[$i]['function']) ? $trace[$i]['function'] : '',
                        'Message'               => $trace[$i]['args'][0],
                        'File'                  => isset($trace[$i]['file']) ? $this->_escapeTraceFile($trace[$i]['file']) : '',
                        'Line'                  => isset($trace[$i]['line']) ? $trace[$i]['line'] : '',
                        'Args'                  => isset($trace[$i]['args']) ? $this->encodeObject($trace[$i]['args']) : '',
                        'Trace'                 => $this->_escapeTrace(array_splice($trace, $i + 1)));

                    $skipFinalObjectEncode = true;
                    $meta['file']          = isset($trace[$i]['file']) ? $this->_escapeTraceFile($trace[$i]['file']) : '';
                    $meta['line']          = isset($trace[$i]['line']) ? $trace[$i]['line'] : '';
                    break;
                }
            }

        } else
        if (self::TABLE == $Type) {

            if (isset($Object[0]) && is_string($Object[0])) {
                $Object[1] = $this->encodeTable($Object[1]);
            } else {
                $Object = $this->encodeTable($Object);
            }

            $skipFinalObjectEncode = true;

        } else
        if (self::GROUP_START == $Type) {

            if (!$Label) {
                throw $this->newException('You must specify a label for the group!');
            }

        } else {
            if (null === $Type) {
                $Type = self::LOG;
            }
        }

        if ($this->options['includeLineNumbers']) {
            if (!isset($meta['file']) || !isset($meta['line'])) {

                $trace = debug_backtrace();
                for ($i = 0; $trace && $i < sizeof($trace); $i++) {

                    if (isset($trace[$i]['class'])
                        && isset($trace[$i]['file'])
                        && ('FirePHP' == $trace[$i]['class'] || 'FB' == $trace[$i]['class'])
                        && (substr($this->_standardizePath($trace[$i]['file']), -18, 18) == 'FirePHPCore/fb.php'
                            || substr($this->_standardizePath($trace[$i]['file']), -29, 29) == 'FirePHPCore/FirePHP.class.php')) {
                        /* Skip - FB::trace(), FB::send(), $firephp->trace(), $firephp->fb() */
                    } else
                    if (isset($trace[$i]['class'])
                        && isset($trace[$i + 1]['file'])
                        && 'FirePHP' == $trace[$i]['class'] && substr($this->_standardizePath($trace[$i + 1]['file']), -18, 18) == 'FirePHPCore/fb.php') {
                        /* Skip fb() */
                    } else
                    if (isset($trace[$i]['file'])
                        && substr($this->_standardizePath($trace[$i]['file']), -18, 18) == 'FirePHPCore/fb.php') {
                        /* Skip FB::fb() */
                    } else {
                        $meta['file'] = isset($trace[$i]['file']) ? $this->_escapeTraceFile($trace[$i]['file']) : '';
                        $meta['line'] = isset($trace[$i]['line']) ? $trace[$i]['line'] : '';
                        break;
                    }
                }
            }
        } else {
            unset($meta['file']);
            unset($meta['line']);
        }

        $this->setHeader('X-Wf-Protocol-1', 'http://meta.wildfirehq.org/Protocol/JsonStream/0.2');
        $this->setHeader('X-Wf-1-Plugin-1', 'http://meta.firephp.org/Wildfire/Plugin/FirePHP/Library-FirePHPCore/' . self::VERSION);

        $structure_index = 1;
        if (self::DUMP == $Type) {
            $structure_index = 2;
            $this->setHeader('X-Wf-1-Structure-2', 'http://meta.firephp.org/Wildfire/Structure/FirePHP/Dump/0.1');
        } else {
            $this->setHeader('X-Wf-1-Structure-1', 'http://meta.firephp.org/Wildfire/Structure/FirePHP/FirebugConsole/0.1');
        }

        if (self::DUMP == $Type) {
            $msg = '{"' . $Label . '":' . $this->jsonEncode($Object, $skipFinalObjectEncode) . '}';
        } else {
            $msg_meta         = $Options;
            $msg_meta['Type'] = $Type;
            if (null !== $Label) {
                $msg_meta['Label'] = $Label;
            }
            if (isset($meta['file']) && !isset($msg_meta['File'])) {
                $msg_meta['File'] = $meta['file'];
            }
            if (isset($meta['line']) && !isset($msg_meta['Line'])) {
                $msg_meta['Line'] = $meta['line'];
            }
            $msg = '[' . $this->jsonEncode($msg_meta) . ',' . $this->jsonEncode($Object, $skipFinalObjectEncode) . ']';
        }

        $parts = explode("\n", chunk_split($msg, 5000, "\n"));

        for ($i = 0; $i < count($parts); $i++) {

            $part = $parts[$i];
            if ($part) {

                if (count($parts) > 2) {
                    // Message needs to be split into multiple parts
                    $this->setHeader('X-Wf-1-' . $structure_index . '-' . '1-' . $this->messageIndex,
                        ((0 == $i) ? strlen($msg) : '')
                        . '|' . $part . '|'
                        . (($i < count($parts) - 2) ? '\\' : ''));
                } else {
                    $this->setHeader('X-Wf-1-' . $structure_index . '-' . '1-' . $this->messageIndex,
                        strlen($part) . '|' . $part . '|');
                }

                $this->messageIndex++;

                if ($this->messageIndex > 99999) {
                    throw $this->newException('Maximum number (99,999) of messages reached!');
                }
            }
        }

        $this->setHeader('X-Wf-1-Index', $this->messageIndex - 1);

        return true;
    }

    /**
     * Standardizes path for windows systems.
     *
     * @param string $Path
     * @return string
     */
    protected function _standardizePath($Path)
    {
        return preg_replace('/\\\\+/', '/', $Path);
    }

    /**
     * Escape trace path for windows systems
     *
     * @param array $Trace
     * @return array
     */
    protected function _escapeTrace($Trace)
    {
        if (!$Trace) {
            return $Trace;
        }

        for ($i = 0; $i < sizeof($Trace); $i++) {
            if (isset($Trace[$i]['file'])) {
                $Trace[$i]['file'] = $this->_escapeTraceFile($Trace[$i]['file']);
            }
            if (isset($Trace[$i]['args'])) {
                $Trace[$i]['args'] = $this->encodeObject($Trace[$i]['args']);
            }
        }
        return $Trace;
    }

    /**
     * Escape file information of trace for windows systems
     *
     * @param string $File
     * @return string
     */
    protected function _escapeTraceFile($File)
    {
        /* Check if we have a windows filepath */
        if (strpos($File, '\\')) {
            /* First strip down to single \ */

            $file = preg_replace('/\\\\+/', '\\', $File);

            return $file;
        }
        return $File;
    }

    /**
     * Check if headers have already been sent
     *
     * @param string $Filename
     * @param integer $Linenum
     */
    protected function headersSent(&$Filename, &$Linenum)
    {
        return headers_sent($Filename, $Linenum);
    }

    /**
     * Send header
     *
     * @param string $Name
     * @param string $Value
     */
    protected function setHeader($Name, $Value)
    {
        return header($Name . ': ' . $Value);
    }

    /**
     * Get user agent
     *
     * @return string|false
     */
    protected function getUserAgent()
    {
        if (!isset($_SERVER['HTTP_USER_AGENT'])) {
            return false;
        }

        return $_SERVER['HTTP_USER_AGENT'];
    }

    /**
     * Get all request headers
     *
     * @return array
     */
    public static function getAllRequestHeaders()
    {
        static $_cached_headers = false;
        if (false !== $_cached_headers) {
            return $_cached_headers;
        }
        $headers = array();
        if (function_exists('getallheaders')) {
            foreach (getallheaders() as $name => $value) {
                $headers[strtolower($name)] = $value;
            }
        } else {
            foreach ($_SERVER as $name => $value) {
                if (substr($name, 0, 5) == 'HTTP_') {
                    $headers[strtolower(str_replace(' ', '-', str_replace('_', ' ', substr($name, 5))))] = $value;
                }
            }
        }
        return $_cached_headers = $headers;
    }

    /**
     * Get a request header
     *
     * @return string|false
     */
    protected function getRequestHeader($Name)
    {
        $headers = self::getAllRequestHeaders();
        if (isset($headers[strtolower($Name)])) {
            return $headers[strtolower($Name)];
        }
        return false;
    }

    /**
     * Returns a new exception
     *
     * @param string $Message
     * @return Exception
     */
    protected function newException($Message)
    {
        return new Exception($Message);
    }

    /**
     * Encode an object into a JSON string
     *
     * Uses PHP's jeson_encode() if available
     *
     * @param object $Object The object to be encoded
     * @return string The JSON string
     */
    public function jsonEncode($Object, $skipObjectEncode = false)
    {
        if (!$skipObjectEncode) {
            $Object = $this->encodeObject($Object);
        }

        if (function_exists('json_encode')
            && false != $this->options['useNativeJsonEncode']) {

            return jsonEncode($Object);
        } else {
            return $this->jsonEncode($Object);
        }
    }

    /**
     * Encodes a table by encoding each row and column with encodeObject()
     *
     * @param array $Table The table to be encoded
     * @return array
     */
    protected function encodeTable($Table)
    {

        if (!$Table) {
            return $Table;
        }

        $new_table = array();
        foreach ($Table as $row) {

            if (is_array($row)) {
                $new_row = array();

                foreach ($row as $item) {
                    $new_row[] = $this->encodeObject($item);
                }

                $new_table[] = $new_row;
            }
        }

        return $new_table;
    }

    /**
     * Encodes an object including members with
     * protected and private visibility
     *
     * @param Object $Object The object to be encoded
     * @param int $Depth The current traversal depth
     * @return array All members of the object
     */
    protected function encodeObject($Object, $ObjectDepth = 1, $ArrayDepth = 1, $MaxDepth = 1)
    {
        if ($MaxDepth > $this->options['maxDepth']) {
            return '** Max Depth (' . $this->options['maxDepth'] . ') **';
        }

        $return = array();

        if (is_resource($Object)) {

            return '** ' . (string) $Object . ' **';

        } else
        if (is_object($Object)) {

            if ($ObjectDepth > $this->options['maxObjectDepth']) {
                return '** Max Object Depth (' . $this->options['maxObjectDepth'] . ') **';
            }

            foreach ($this->objectStack as $refVal) {
                if ($refVal === $Object) {
                    return '** Recursion (' . get_class($Object) . ') **';
                }
            }
            array_push($this->objectStack, $Object);

            $return['__className'] = $class = get_class($Object);
            $class_lower           = strtolower($class);

            $reflectionClass = new ReflectionClass($class);
            $properties      = array();
            foreach ($reflectionClass->getProperties() as $property) {
                $properties[$property->getName()] = $property;
            }

            $members = (array) $Object;

            foreach ($properties as $plain_name => $property) {

                $name = $raw_name = $plain_name;
                if ($property->isStatic()) {
                    $name = 'static:' . $name;
                }
                if ($property->isPublic()) {
                    $name = 'public:' . $name;
                } else
                if ($property->isPrivate()) {
                    $name     = 'private:' . $name;
                    $raw_name = "\0" . $class . "\0" . $raw_name;
                } else
                if ($property->isProtected()) {
                    $name     = 'protected:' . $name;
                    $raw_name = "\0" . '*' . "\0" . $raw_name;
                }

                if (!(isset($this->objectFilters[$class_lower])
                    && is_array($this->objectFilters[$class_lower])
                    && in_array($plain_name, $this->objectFilters[$class_lower]))) {

                    if (array_key_exists($raw_name, $members)
                        && !$property->isStatic()) {

                        $return[$name] = $this->encodeObject($members[$raw_name], $ObjectDepth + 1, 1, $MaxDepth + 1);

                    } else {
                        if (method_exists($property, 'setAccessible')) {
                            $property->setAccessible(true);
                            $return[$name] = $this->encodeObject($property->getValue($Object), $ObjectDepth + 1, 1, $MaxDepth + 1);
                        } else
                        if ($property->isPublic()) {
                            $return[$name] = $this->encodeObject($property->getValue($Object), $ObjectDepth + 1, 1, $MaxDepth + 1);
                        } else {
                            $return[$name] = '** Need PHP 5.3 to get value **';
                        }
                    }
                } else {
                    $return[$name] = '** Excluded by Filter **';
                }
            }

            // Include all members that are not defined in the class
            // but exist in the object
            foreach ($members as $raw_name => $value) {

                $name = $raw_name;

                if ("\0" == $name{0}) {
                    $parts = explode("\0", $name);
                    $name  = $parts[2];
                }

                $plain_name = $name;

                if (!isset($properties[$name])) {
                    $name = 'undeclared:' . $name;

                    if (!(isset($this->objectFilters[$class_lower])
                        && is_array($this->objectFilters[$class_lower])
                        && in_array($plain_name, $this->objectFilters[$class_lower]))) {

                        $return[$name] = $this->encodeObject($value, $ObjectDepth + 1, 1, $MaxDepth + 1);
                    } else {
                        $return[$name] = '** Excluded by Filter **';
                    }
                }
            }

            array_pop($this->objectStack);

        } elseif (is_array($Object)) {

            if ($ArrayDepth > $this->options['maxArrayDepth']) {
                return '** Max Array Depth (' . $this->options['maxArrayDepth'] . ') **';
            }

            foreach ($Object as $key => $val) {

                // Encoding the $GLOBALS PHP array causes an infinite loop
                // if the recursion is not reset here as it contains
                // a reference to itself. This is the only way I have come up
                // with to stop infinite recursion in this case.
                if ('GLOBALS' == $key && is_array($val)
                    && array_key_exists('GLOBALS', $val)) {
                    $val['GLOBALS'] = '** Recursion (GLOBALS) **';
                }

                $return[$key] = $this->encodeObject($val, 1, $ArrayDepth + 1, $MaxDepth + 1);
            }
        } else {
            if (self::isUtf8($Object)) {
                return $Object;
            } else {
                return utf8_encode($Object);
            }
        }
        return $return;
    }

    /**
     * Returns true if $string is valid UTF-8 and false otherwise.
     *
     * @param mixed $str String to be tested
     * @return boolean
     */
    protected static function isUtf8($str)
    {
        if (function_exists('mb_detect_encoding')) {
            return (mb_detect_encoding($str) == 'UTF-8');
        }
        $c    = 0;
        $b    = 0;
        $bits = 0;
        $len  = strlen($str);
        for ($i = 0; $i < $len; $i++) {
            $c = ord($str[$i]);
            if ($c > 128) {
                if (($c >= 254)) {
                    return false;
                } elseif ($c >= 252) {
                    $bits = 6;
                } elseif ($c >= 248) {
                    $bits = 5;
                } elseif ($c >= 240) {
                    $bits = 4;
                } elseif ($c >= 224) {
                    $bits = 3;
                } elseif ($c >= 192) {
                    $bits = 2;
                } else {
                    return false;
                }

                if (($i + $bits) > $len) {
                    return false;
                }

                while ($bits > 1) {
                    $i++;
                    $b = ord($str[$i]);
                    if ($b < 128 || $b > 191) {
                        return false;
                    }

                    $bits--;
                }
            }
        }
        return true;
    }

    /**
     * Converts to and from JSON format.
     *
     * JSON (JavaScript Object Notation) is a lightweight data-interchange
     * format. It is easy for humans to read and write. It is easy for machines
     * to parse and generate. It is based on a subset of the JavaScript
     * Programming Language, Standard ECMA-262 3rd Edition - December 1999.
     * This feature can also be found in  Python. JSON is a text format that is
     * completely language independent but uses conventions that are familiar
     * to programmers of the C-family of languages, including C, C++, C#, Java,
     * JavaScript, Perl, TCL, and many others. These properties make JSON an
     * ideal data-interchange language.
     *
     * This package provides a simple encoder and decoder for JSON notation. It
     * is intended for use with client-side Javascript applications that make
     * use of HTTPRequest to perform server communication functions - data can
     * be encoded into JSON notation for use in a client-side javascript, or
     * decoded from incoming Javascript requests. JSON format is native to
     * Javascript, and can be directly eval()'ed with no further parsing
     * overhead
     *
     * All strings should be in ASCII or UTF-8 format!
     *
     * LICENSE: Redistribution and use in source and binary forms, with or
     * without modification, are permitted provided that the following
     * conditions are met: Redistributions of source code must retain the
     * above copyright notice, this list of conditions and the following
     * disclaimer. Redistributions in binary form must reproduce the above
     * copyright notice, this list of conditions and the following disclaimer
     * in the documentation and/or other materials provided with the
     * distribution.
     *
     * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
     * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
     * NO EVENT SHALL CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
     * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
     * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
     * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
     * DAMAGE.
     *
     * @category
     * @package     Services_JSON
     * @author      Michal Migurski <mike-json@teczno.com>
     * @author      Matt Knapp <mdknapp[at]gmail[dot]com>
     * @author      Brett Stimmerman <brettstimmerman[at]gmail[dot]com>
     * @author      Christoph Dorn <christoph@christophdorn.com>
     * @copyright   2005 Michal Migurski
     * @version     CVS: $Id: JSON.php,v 1.31 2006/06/28 05:54:17 migurski Exp $
     * @license     http://www.opensource.org/licenses/bsd-license.php
     * @link        http://pear.php.net/pepr/pepr-proposal-show.php?id=198
     */

    /**
     * Keep a list of objects as we descend into the array so we can detect recursion.
     */
    private $json_objectStack = array();

    /**
     * convert a string from one UTF-8 char to one UTF-16 char
     *
     * Normally should be handled by mb_convert_encoding, but
     * provides a slower PHP-only method for installations
     * that lack the multibye string extension.
     *
     * @param    string  $utf8   UTF-8 character
     * @return   string  UTF-16 character
     * @access   private
     */
    private function jsonUtf82utf16($utf8)
    {
        // oh please oh please oh please oh please oh please
        if (function_exists('mb_convert_encoding')) {
            return mb_convert_encoding($utf8, 'UTF-16', 'UTF-8');
        }

        switch (strlen($utf8)) {
            case 1:
                // this case should never be reached, because we are in ASCII range
                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                return $utf8;

            case 2:
                // return a UTF-16 character from a 2-byte UTF-8 char
                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                return chr(0x07 & (ord($utf8{0}) >> 2))
                . chr((0xC0 & (ord($utf8{0}) << 6))
                     | (0x3F & ord($utf8{1})));

            case 3:
                // return a UTF-16 character from a 3-byte UTF-8 char
                // see: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                return chr((0xF0 & (ord($utf8{0}) << 4))
                     | (0x0F & (ord($utf8{1}) >> 2)))
                . chr((0xC0 & (ord($utf8{1}) << 6))
                     | (0x7F & ord($utf8{2})));
        }

        // ignoring UTF-32 for now, sorry
        return '';
    }

    /**
     * encodes an arbitrary variable into JSON format
     *
     * @param    mixed   $var    any number, boolean, string, array, or object to be encoded.
     *                           see argument 1 to Services_JSON() above for array-parsing behavior.
     *                           if var is a strng, note that encode() always expects it
     *                           to be in ASCII or UTF-8 format!
     *
     * @return   mixed   JSON string representation of input var or an error if a problem occurs
     * @access   public
     */
    private function jsonEncode($var)
    {

        if (is_object($var)) {
            if (in_array($var, $this->json_objectStack)) {
                return '"** Recursion **"';
            }
        }

        switch (gettype($var)) {
            case 'boolean':
                return $var ? 'true' : 'false';

            case 'NULL':
                return 'null';

            case 'integer':
                return (int) $var;

            case 'double':
            case 'float':
                return (float) $var;

            case 'string':
                // STRINGS ARE EXPECTED TO BE IN ASCII OR UTF-8 FORMAT
                $ascii      = '';
                $strlen_var = strlen($var);

                /*
                 * Iterate over every character in the string,
                 * escaping with a slash or encoding to UTF-8 where necessary
                 */
                for ($c = 0; $c < $strlen_var; ++$c) {

                    $ord_var_c = ord($var{$c});

                    switch (true) {
                        case 0x08 == $ord_var_c:
                            $ascii .= '\b';
                            break;
                        case 0x09 == $ord_var_c:
                            $ascii .= '\t';
                            break;
                        case 0x0A == $ord_var_c:
                            $ascii .= '\n';
                            break;
                        case 0x0C == $ord_var_c:
                            $ascii .= '\f';
                            break;
                        case 0x0D == $ord_var_c:
                            $ascii .= '\r';
                            break;

                        case 0x22 == $ord_var_c:
                        case 0x2F == $ord_var_c:
                        case 0x5C == $ord_var_c:
                            // double quote, slash, slosh
                            $ascii .= '\\' . $var{$c};
                            break;

                        case (($ord_var_c >= 0x20) && ($ord_var_c <= 0x7F)):
                            // characters U-00000000 - U-0000007F (same as ASCII)
                            $ascii .= $var{$c};
                            break;

                        case (($ord_var_c & 0xE0) == 0xC0):
                            // characters U-00000080 - U-000007FF, mask 110XXXXX
                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                            $char = pack('C*', $ord_var_c, ord($var{$c + 1}));
                            $c += 1;
                            $utf16 = $this->jsonUtf82utf16($char);
                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
                            break;

                        case (($ord_var_c & 0xF0) == 0xE0):
                            // characters U-00000800 - U-0000FFFF, mask 1110XXXX
                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                            $char = pack('C*', $ord_var_c,
                                ord($var{$c + 1}),
                                ord($var{$c + 2}));
                            $c += 2;
                            $utf16 = $this->jsonUtf82utf16($char);
                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
                            break;

                        case (($ord_var_c & 0xF8) == 0xF0):
                            // characters U-00010000 - U-001FFFFF, mask 11110XXX
                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                            $char = pack('C*', $ord_var_c,
                                ord($var{$c + 1}),
                                ord($var{$c + 2}),
                                ord($var{$c + 3}));
                            $c += 3;
                            $utf16 = $this->jsonUtf82utf16($char);
                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
                            break;

                        case (($ord_var_c & 0xFC) == 0xF8):
                            // characters U-00200000 - U-03FFFFFF, mask 111110XX
                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                            $char = pack('C*', $ord_var_c,
                                ord($var{$c + 1}),
                                ord($var{$c + 2}),
                                ord($var{$c + 3}),
                                ord($var{$c + 4}));
                            $c += 4;
                            $utf16 = $this->jsonUtf82utf16($char);
                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
                            break;

                        case (($ord_var_c & 0xFE) == 0xFC):
                            // characters U-04000000 - U-7FFFFFFF, mask 1111110X
                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                            $char = pack('C*', $ord_var_c,
                                ord($var{$c + 1}),
                                ord($var{$c + 2}),
                                ord($var{$c + 3}),
                                ord($var{$c + 4}),
                                ord($var{$c + 5}));
                            $c += 5;
                            $utf16 = $this->jsonUtf82utf16($char);
                            $ascii .= sprintf('\u%04s', bin2hex($utf16));
                            break;
                    }
                }

                return '"' . $ascii . '"';

            case 'array':
                /*
                 * As per JSON spec if any array key is not an integer
                 * we must treat the the whole array as an object. We
                 * also try to catch a sparsely populated associative
                 * array with numeric keys here because some JS engines
                 * will create an array with empty indexes up to
                 * max_index which can cause memory issues and because
                 * the keys, which may be relevant, will be remapped
                 * otherwise.
                 *
                 * As per the ECMA and JSON specification an object may
                 * have any string as a property. Unfortunately due to
                 * a hole in the ECMA specification if the key is a
                 * ECMA reserved word or starts with a digit the
                 * parameter is only accessible using ECMAScript's
                 * bracket notation.
                 */

                // treat as a JSON object
                if (is_array($var) && count($var) && (array_keys($var) !== range(0, sizeof($var) - 1))) {

                    $this->json_objectStack[] = $var;

                    $properties = array_map(array($this, 'json_name_value'),
                        array_keys($var),
                        array_values($var));

                    array_pop($this->json_objectStack);

                    foreach ($properties as $property) {
                        if ($property instanceof Exception) {
                            return $property;
                        }
                    }

                    return '{' . join(',', $properties) . '}';
                }

                $this->json_objectStack[] = $var;

                // treat it like a regular array
                $elements = array_map(array($this, 'json_encode'), $var);

                array_pop($this->json_objectStack);

                foreach ($elements as $element) {
                    if ($element instanceof Exception) {
                        return $element;
                    }
                }

                return '[' . join(',', $elements) . ']';

            case 'object':
                $vars = self::encodeObject($var);

                $this->json_objectStack[] = $var;

                $properties = array_map(array($this, 'json_name_value'),
                    array_keys($vars),
                    array_values($vars));

                array_pop($this->json_objectStack);

                foreach ($properties as $property) {
                    if ($property instanceof Exception) {
                        return $property;
                    }
                }

                return '{' . join(',', $properties) . '}';

            default:
                return null;
        }
    }

    /**
     * array-walking function for use in generating JSON-formatted name-value pairs
     *
     * @param    string  $name   name of key to use
     * @param    mixed   $value  reference to an array element to be encoded
     *
     * @return   string  JSON-formatted name-value pair, like '"name":value'
     * @access   private
     */
    private function jsonNameValue($name, $value)
    {
        // Encoding the $GLOBALS PHP array causes an infinite loop
        // if the recursion is not reset here as it contains
        // a reference to itself. This is the only way I have come up
        // with to stop infinite recursion in this case.
        if ('GLOBALS' == $name && is_array($value)
            && array_key_exists('GLOBALS', $value)) {
            $value['GLOBALS'] = '** Recursion **';
        }

        $encoded_value = $this->jsonEncode($value);

        if ($encoded_value instanceof Exception) {
            return $encoded_value;
        }

        return $this->jsonEncode(strval($name)) . ':' . $encoded_value;
    }

    /**
     * @deprecated
     */
    public function setProcessorUrl($URL)
    {
        trigger_error("The FirePHP::setProcessorUrl() method is no longer supported", E_USER_DEPRECATED);
    }

    /**
     * @deprecated
     */
    public function setRendererUrl($URL)
    {
        trigger_error("The FirePHP::setRendererUrl() method is no longer supported", E_USER_DEPRECATED);
    }
}
